Explanation:
The law of conservation of mass states that the total mass of the products is equal to the total of the reactants.
A chemical change occurs because of a chemical reaction.
In a chemical reaction, the reactants are the starting substances and the products is the finishing substances. The amount of each type of atoms to start with and end with are also equal.
No matter disappears after a chemical reaction.
Answer:
The amount of matter in the new substances is the same as the original.
This is known as the law of conservation of mass.
Final answer:
In a chemical change, the law of conservation of matter indicates that the total amount of matter remains constant, with atoms being rearranged but not created or destroyed.
Explanation:
When a chemical change occurs, the amount of matter in the new substances remains unchanged according to the law of conservation of matter. This fundamental principle asserts that during any chemical reaction, matter is neither created nor destroyed. Instead, the atoms are simply rearranged to form new substances. Therefore, the number and type of atoms present after a chemical change are the same as those before the change took place.
The formation of new substances implies that one kind of matter is transformed into a different kind. Although the properties and appearance might change significantly, the total mass remains constant. For everyday chemical reactions, any mass changes are too negligible to measure, and thus the law holds true. However, in nuclear reactions, which involve changes to the nucleus of an atom, the energy changes can be significant enough to result in detectable mass changes. In such cases, the laws of conservation of matter and energy are considered in a combined way to reflect that the total quantity of matter and energy is fixed.
Suppose we have the following pizza recipe:
1 crust + 5 ounces tomato sauce + 2 cups cheese → 1 pizza
Let's assume that we currently have 4 crusts and 10 cups of cheese. What is the minimum number of ounces of tomato sauce would you need in order to make 3 pizzas?
Answer:
we required 15 ounce tomato sauce for 3 pizza
Explanation:
Given data:
Crust = 4
Cheese = 10 cups
number of ounces of tomato sauce for 3 pizza = ?
Solution:
Recipe and ingredients for one pizza:
1 crust + 5 ounce tomato sauce + 2 cups cheese → 1 pizza
Ingredients required for 3 pizza;
1 × 3 crust + 5 ×3 ounce tomato sauce + 2×3 cups cheese → 3 pizaa
3 crust + 15 ounce tomato sauce + 6 cups cheese → 3 pizaa
So we required 15 ounce tomato sauce for 3 pizza.
15 ounce tomato sauce for 3 pizzas.
Given:-
Crust = 4
Cheese = 10 cups
number of ounces of tomato sauce for 3 pizza = ?
Recipe and ingredients for one pizza:1 crust + 5 ounce tomato sauce + 2 cups cheese → 1 pizza
Ingredients required for 3 pizza;[tex]1 \times 3 crust + 5 \times3 ounce tomato sauce + 2\times3 cups cheese\rightarrow 3 pizaa[/tex]
[tex]3 crust + 15 ounce tomato sauce + 6 cups cheese\rightarrow3 pizaa[/tex]
So we required 15 ounce tomato sauce for 3 pizza.
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the fact that same molecules of matter have been around for years is supported by
Answer:
The law of definite proportions
Explanation:
The law of definite proportions states that atoms combine in a molecule in a specific molar ratio or specific stoichiometry. For example, it's proved that regardless of the quantity we take, two hydrogen atoms always combine with one oxygen atom to form a water molecule.
Similarly, ionic substances follow the same pattern. Since the net charge of ionic salts should be equal to 0 and each element has a definite number of valence electrons in its shell all the time, the ions combine in a way, so that cations balance the charge of anions.
Essentially, the law of definite proportions is applicable and will be applicable in the future, since we know that each element has a fixed number of valence electrons in its ground state.
why does the second row of the periodic table not have a d block section
Second row of periodic table can have maximum of eight electrons which are occupied within s and p block section by occupying 2 and 6 electrons respectively and thus becoming stable thus it doesn't have d block section.
What is periodic table?Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.
It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.
Elements present in the same group have same number of valence electrons and hence have similar properties while elements present in the same period show gradual variation in properties due to addition of one electron for each successive element in a period.
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Solid iodine crystals at the bottom of a closed test tube sublime to form iodine vapor. The vapor eventually fills the entire test tube. Use kinetic molecular theory to explain the diffusion of the iodine gas and whether diffusion happens in liquids and solids.
Answer:
Diffusion occurs in solid and liquid through the constant and random motion of the smaller particles called molecules of either solid, liquid or gaseous in permeable medium as witnessed in the experiment.
Explanation:
The kinectic molecular theory of matter states that the smaller particles of matters called molecules are in constant, but random motion and the degree of movement of the molecules depends on the state or phase such matter exist, which is a derivative of the total kinetic energy possessed by the molecules. This average kinetic energy of the molecules as iodine for example is proportional to the temperature of the matter.
Diffusion should be remembered as the movement of molecules of matters from a highly concentrated region otherwise called hypertonic region to a less concentrated region called hypotonic region through a permeable medium until there is an equilibrium in the system. Since diffusion is expected to involve the movement of molecules, and any matter that can exhibit diffusion is said to have moving molecules, therefore, the kinetic molecular theory of matter is proven to be accurate with the observed movement of iodine molecules in the test tube. This shows that even the molecules of solid matters are in constant random motion, this is made more convincing when these molecules migrate without the addition of external energy source like heat, which then help to understand that the natural iodine molecules are in constant random motion, as they are changed to gaseous state without passing through liquid state, a phenomenon called sublimation.
Conductors have(blank)
resistance.
Moderate.
Very High.
Very low.
Answer:
The correct option is C) Very low
Explanation:
In physics, resistance can be described as the opposition to the flow of current or the flow of electrons. Conductors are known to be materials which can conduct electricity. Hence, conductivity and resistance are opposite to each other. Good conductors will have very little or no resistance and will have enhanced conductivity. On the contrary, insulators are materials which will have more resistance and they cannot conduct electricity as efficiently.
Answer:
low
Explanation:
How many ions (i) would be produced when the Li3PO4 molecule is dissolved in a
solvent?
Answer:
4
Explanation:
[tex]Li_3PO_4[/tex] is an ionic crystal rather than a molecule. An ionic crystal dissolved in water dissociates into its cations and anions.
Lithium phosphate consists of two ions. Firstly, the metallic component, lithium, is a positively charged ion in this salt, also known as a cation.
The remaining part, phosphate, is an anion. When lithium phosphate is dissolved in water, the following process takes place:
[tex]Li_3PO_4 (aq)\rightarrow 3 Li^+ (aq) + PO_4^{3-} (aq)[/tex]
Notice that for 1 formula unit of lithium phosphate, a total of 3 units of lithium cations and 1 unit of phosphate anions are produced.
The correct answer is 4 ions will be produced when the Li3PO4 molecule dissolves in a solvent.
Lithium phosphate (Li3PO4) is an ionic compound composed of lithium (Li) cations and phosphate (PO4) anions. When Li3PO4 dissolves in a solvent, it dissociates into its constituent ions.
The lithium ion (Li+) has a charge of +1, and there are three lithium atoms in the Li3PO4 molecule. Therefore, when dissolved, these will produce three lithium ions (3 Li+).
The phosphate ion (PO4^3-) has a charge of -3. Since there is only one phosphate group in the molecule, it will dissociate into one phosphate ion (1 PO4^3-).
To find the total number of ions produced, we add the number of lithium ions to the number of phosphate ions:
Total number of ions = Number of lithium ions + Number of phosphate ions
Total number of ions = 3 + 1
Total number of ions = 4
Therefore, 4 ions in total are produced when Li3PO4 dissolves in a solvent: 3 lithium ions (Li+) and 1 phosphate ion (PO4^3-).
What are the three majors factors which affect weather?
Answer: The three main factors of weather are light (solar radiation), water (moisture) and temperature.
The three major factors of weather are light (solar radiation), water (moisture) and temperature.
What is Weather ?Weather is the day-to-day state of the atmosphere, and its short-term variation in minutes to weeks.
We generally think of weather as the combination of temperature, humidity, precipitation, cloudiness, visibility, and wind
Total Factors that affect the weather condition: temperature, pressure, moisture content, speed and direction in which its moves.
One factor is that the sun does not heat all parts of the earth equally; the resulting difference in density and pressure causes the air to move from different places.
Hence, The three major factors of weather are light (solar radiation), water (moisture) and temperature.
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Which nuclear process does the model illustrate
Nuclear fission
Hope I helped :)
The model illustrates the nuclear process of fission, where a larger nucleus splits into two or more smaller nuclei along with the release of energy.
Nuclear fission is the process illustrated, where a neutron causes a fissile atom like U-235 to split into smaller nuclei, releasing energy and more neutrons. During fission, the nucleus undergoes division, resulting in the production of additional particles and the liberation of energy.
The nuclear process illustrated by the model is nuclear fission. In nuclear fission, a neutron collides with a fissile atom like U-235, creating a heavier unstable isotope, in this case, U-236. This unstable nucleus then undergoes fission, splitting into smaller nuclei and releasing additional neutrons along with a significant amount of energy.
The liquid drop model proposed by Niels Bohr and John Wheeler explains this by comparing the nucleus to a droplet of water. When an external neutron impacts the uranium nucleus, it causes the nucleus to deform and eventually split, similar to a vibrating water droplet eventually breaking apart. The process can be tracked using nuclear symbols, and understanding it is crucial for applications like nuclear reactors where controlled fission is used for electricity generation.
Moreover, the models constructed to describe the nucleus should accurately reflect known nuclear properties and predict new properties that experiments might reveal. These predictions help in understanding nuclear processes such as fission in greater detail.
what is the nuclear charge of an iron atom?
Answer:
Explanation:
The net charge is the difference between the number of protons, which have positive charges, and electrons, which have negative charges. All atoms and ions of iron have 26 protons. Iron's atomic number is 26. Atoms don't gain or lose protons.
The nuclear charge is the total charge of all the protons in the nucleus. It has the same value as the atomic number. The nuclear charge increases you go across the periodic table.
The net charge is the difference between the number of protons, which have positive charges, and electrons, which have negative charges. All atoms and ions of iron have 26 protons. Iron's atomic number is 26. Atoms don't gain or lose protons.
What is an nuclear charge ?The nuclear charge is the total charge of all the protons in the nucleus. It has the same value as the atomic number. The nuclear charge increases you go across the periodic table.
The effective nuclear charge can be calculated by subtracting the number of inner shell electrons from the number of protons. Sodium, for example, has 10 inner electrons and 11 protons, giving it an effective nuclear charge of +1.
+26 Iron has 26 protons in the nucleus each with a charge of +1.
Thus, All atoms and ions of iron have 26 protons. Iron's atomic number is 26.
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Which of the following molecules is correctly paired with its molecular polarity?
F
H20 : non-polar
G
CH4 : polar
H
CO2 : polar
NH3 : polar
Answer:
The correctly matched pair is :
[tex]NH_{3}[/tex] is Polar
Explanation:
Polarity is decided by net dipole moment . If a molecule has 0 dipole moment then it is non-polar .
If a molecule has some value of dipole moment then it is polar.Unit of dipole moment is Debye(D)
[tex]{dipole moment = charge \times distance}[/tex]
In chemical value of dipole is based on two factors :
1. There should be heteroatomic bond in a given compound..e.g H-Cl , C-N
(not C-C, N-N)
2. The molecule should be unsymmetrical in shape.
note : even if all bonds are heteroatomic but shape is symmetrical , then also dipole moment can be zero
CORRECT MATCHES
[tex]H_{2}O[/tex] : Polar
It has net dipole moment of 1.85 D because its shape is bent (unsymmetrical) and all bonds are heteroatomic.
[tex]CH_{4}[/tex] :Non-Polar
All bonds are heteroatomic(C-H) but shape is symmetrical(tetrahedral), so net dipole is zero
[tex]CO_{2}[/tex] : Non -Polar
All bonds are heteroatomic(C=O) but shape is symmetrical(linear), so net dipole is zero
NH3 is correctly identified as polar due to its trigonal pyramidal shape causing an unequal electron distribution. In contrast, H2O is polar (not non-polar), CH4 is non-polar (not polar), and CO2 is non-polar (not polar), illustrating the importance of geometric arrangement in determining molecular polarity.
Explanation:The question involves understanding molecular polarity, a fundamental concept in chemistry. The correct pairing from the options provided is NH3: polar. Let's delve into the rationale behind this answer and correct the misconceptions concerning the other molecules listed.
H2O is indeed a polar molecule due to its bent shape causing an unequal distribution of charge, contrary to the non-polar label provided.CH4 (methane) is non-polar because of its symmetrical tetrahedral structure ensuring that dipole moments cancel each other out, which corrects the provided pairing of it being polar.CO2 is a non-polar molecule, despite having polar bonds, due to its linear shape allowing the dipole moments to cancel. This contrasts with it being labeled polar in the given options.NH3 is accurately identified as polar. Its trigonal pyramidal shape means the dipole moments do not cancel out, leading to a molecule with a distinct pole.To summarize, molecular polarity is determined not only by the presence of polar bonds but also by the molecule's geometry. In this context, NH3 is the correct answer since it is polar due to its geometry leading to an unequal distribution of electron density.
What happens when molten material is heated from Earth’s core?
A It sinks towards the core.
B It rises up towards the crust.
C Lava travels away from the core and forms the crust.
D Lava travels away from the crust and forms the mantle
Answer:
B
Explanation:
I took the test
-Leyla-
wishing you success
A contains 2.60g of impure h2so4 in 5oocm³ of a solution 5.30g of na2co3 in 1.00dm³ of solution
An average of 27.65cm of a neutralized completely 25.0cm of b
Calculate the
A)concentration of b in moldm³
B)concentration of a in 1)moldm³ 2)g/dm³
C)%purity of h²so4
Answer: a. 0.05mol/dm3
bi. 0.045mol/dm3
bii. 4.41g/dm3
c. 84.8%
Explanation:Please see attachment for explanation
Consider the half reactions below for a chemical reaction.
Zn--->Zn²⁺(aq)+2e⁻
Cu²⁺(aq)+2e⁻--->Cu(s)
What is the overall equation for this chemical reaction?
Explanation:
Redox couple
It is defined as : having together the oxidized and reduced forms of a substance taking part in oxidation or reduction half reactions .they are actually conjugate acid base pairs
.we can also define it as : an oxidizing and reducing agent which appear on opposite sides of a half equation constitute the redox couple .Like, given below is the cell in which we consider Zn/Cu redox couple .
Electrochemical cell
• Electrochemical cell is the cell in which chemical energy gets converted to electric energy.
• In it indirect redox reactions takes place.
• These reactions are spontaneous that is free energy change for this reaction is negative.
• This cell consists of two half cells.
• In one half cell , there is a aqueous 1molar Zinc sulphate solution with Zinc rod dipped in it.
• In other half cell, there is a 1 molar aqueous solution of Copper sulphate solution with Copper rod dipped in it.
• These electrodes by means of wire are attached to galvanometer.
• A U-shaped tube is taken, which is sealed from both the ends with cotton plug.
• In this, the electrolyte that is inert electrolyte is taken like Potassium nitrate, Ammonium nitrate etc. The electrolyte present is in semi-liquid state.
Observations
With time we see that Zinc rod loses weight, as it has more tendency to loose electrons that is:
These electrons released by zinc, travel to another beaker by means of wire. In doing so, they cause deflection in galvanometer and produce current. This current travel in the direction opposite to the flow of electrons.
These electrons move to another half cell, where copper ions gain these electrons that is reduction occur. As a result, copper metal start depositing on electrode.
The overall reaction that occurs is shown below:
Zn + Cu²⁺ ---> Zn²⁺ + Cu Zn --> getting oxidised and act as anode Cu --> getting reduced and act as cathode
Answer:
A. Zn(s)+Cu2+(aq)--->Zn2+(aq)+Cu(s)
Explanation:
who did this
Model in which electrons have specific energy levels and
orbit the nucleus like planets around the sun
Answer:
Niels Bohr
Explanation:
It's been long thought that the atomic model resembles a planet model, that is, it was thought that the nucleus containing neutrons and protons is the central part of the atom and there were electrons in several shells orbiting the nucleus.
This is called a planet model, since it follows the pattern seen in our galaxy: the Sun corresponds to a nucleus and the planets orbiting it are like electrons.
This model was proposed by Niels Bohr in 1915 and is called the Bohr Model. In the end, it was proved that the model wasn't really accurate, since electrons didn't have fixed orbitals but rather probabilities to be found in those orbitals, as well as the fact that electrons were exhibiting the properties of waves.
Which one of the following exhibits dipole-dipole attraction between molecules? Group of answer choices SF6 HCl O2 CF4 C10H22
Answer:
The correct answer is HCl
Explanation:
There is a dipole-dipole force in hydrochloric acid (HCl), this type of attraction occurs in polar covalent molecules. In this case, the positive end of the molecule (H) attracts the negative (Cl).
OPTION B.
HCl, or hydrogen chloride, is the molecule from the given list that exhibits dipole-dipole attraction due to its polar covalent bond and the significant difference in electronegativity between hydrogen and chlorine.
Explanation:The question you've asked is related to dipole-dipole interactions, which occur between molecules that are polar, meaning they have a separation of charges. A polar molecule has a partial positive charge on one side and a partial negative charge on the other. Looking at the list provided, HCl (hydrogen chloride) is the molecule that exhibits dipole-dipole attraction between its molecules, as it consists of a polar covalent bond between hydrogen and chlorine, leading to a significant difference in electronegativity and therefore a permanent dipole.
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See questions on the sheet
Answer:
The first question is 4
The second one is 1
Explanation:
Please mark brainliest! Hope it helped!
How many carbon atoms are there in the empirical formula corresponding to C10H22O2?
Final answer:
To find the number of carbon atoms in the empirical formula for C10H22O2, divide each element's subscript by the greatest common divisor, which is 2. The resulting empirical formula is C5H11O, which means there are 5 carbon atoms.
Explanation:
To determine how many carbon atoms are there in the empirical formula corresponding to C10H22O2, you first need to find the simplest whole-number ratio of carbon (C) to hydrogen (H) to oxygen (O) atoms. The molecular formula C10H22O2 shows that the compound has 10 C atoms, 22 H atoms, and 2 O atoms. However, this is not the simplest whole-number ratio. We can divide each of the subscripts by the greatest common divisor, which in this case is 2, to find the empirical formula. So the empirical formula is C5H11O, meaning that the smallest ratio of elements in the compound is 5 carbon atoms to 11 hydrogen atoms to 1 oxygen atom.
Final answer:
The empirical formula for the compound C10H22O2 is achieved by simplifying to the simplest whole-number ratio, resulting in the formula C5H11O, which indicates there are 5 carbon atoms in the empirical formula.
Explanation:
To find out how many carbon atoms there are in the empirical formula for the compound with the molecular formula C10H22O2, we need to simplify the formula by dividing by the greatest common divisor of the subscripts of each element. The goal is to achieve the simplest whole-number ratio of the atoms in the compound.
The numbers of atoms of each element in the molecular formula are in the ratio 10:22:2 for carbon, hydrogen, and oxygen respectively. By simplifying, we find that this ratio can be divided by 2, which gives us 5:11:1. Therefore, the smallest whole-number ratio, which provides us with the empirical formula, is C5H11O. Hence, there are 5 carbon atoms in the empirical formula.
A sample of copper with a mass of 63.5g contains 6.02 x10^23 atoms calculate the mass of an average copper atom
Answer:
1.024 x 10⁻²²g
Explanation:
Data Given:
mass of copper = 63.5 g
no. of atoms of copper = 6.02 x10²³ atoms
mass of of an average copper = ?
Solution:
As 6.02 x10²³ atoms have 63.5 g of mass then what will be the mass of atom.
Apply unity formula
63.5 g of copper ≅ 6.02 x10²³ atoms of copper
mass of copper atom ≅ 1 atom of copper
Do cross multiplication
mass of copper atom = 1 atom x 63.5 g / 6.02 x10²³ atoms
mass of copper atom = 1.024 x 10⁻²² g
mass of an average copper atom = 1.024 x 10⁻²² g
18 g of copper is mixed with silver nitrate in water. How much copper ll nitrate will formed?
Answer:
Mass = 112.54 g
Explanation:
Given data:
Mass of copper = 18 g
How much copper(II) nitrate formed = ?
Solution:
Cu + 2AgNO₃ → Cu(NO₃)₂ + 2Ag
Number of moles of copper:
Number of moles = mass/ molar mass
Number of moles = 18 g/ 29 g/mol
Number of moles = 0.6 mol
Now we will compare the moles of Cu with Cu(NO₃)₂ .
Cu : Cu(NO₃)₂
1 : 1
0.6 : 0.6
Mass of Cu(NO₃)₂ :
Mass = number of moles × molar mass
Mass = 0.6 mol × 187.56 g/mol
Mass = 112.54 g
SC.8.P.8.5, SC.8.P.8.8
2. The ammonia molecule (NH) is polar. Which
statement is NOT true about ammonia?
A. It contains polar bonds.
B. It contains covalent bonds.
C. Electrons are evenly shared among the
atoms.
D. The charges on the polar bonds are
arranged so that they are balanced.
Answer:
the wrong option is The charges on the polar bonds are
arranged so that they are balanced.
Explanation:
if an electron is more electro negative it has more tendency to pull the valence electron towards itself.
electronegativity is the measure of the tendency of an atom to attract bonding pair of electron towards itself.
electro negativity increases along the group and decreases down the group.
nitrogen is more electronegative than hydrogen so it will tend to attract the bonding pair of electron towards itself.
therefore electrons are not evenly shared between the atoms
Answer:
Electrons are evenly shared among the
atoms.
Explanation:
all the others are obviously wrong
What is thermal energy?
the average overall volume of a system
the total number of molecules in a system
the kinetic energy of particles in a system
the measure of temperature in a system
Answer:
The answer is (C) the kinetic energy of particles in a system.
Final answer:
Thermal energy is the kinetic energy of the particles in a system, associated with their random motion. It increases with temperature, highlighting the link between kinetic energy and temperature as a measure of this energy's concentration.
Explanation:
Thermal energy is essentially the kinetic energy associated with the random motion of atoms and molecules in a system. It represents a form of internal energy that is dependent on temperature, increasing as the temperature of the system rises. This form of energy is related to the movement—whether through vibration, rotation, or translational motion—of the particles within a system. It's important to differentiate between thermal energy and temperature; while thermal energy refers to the kinetic energy of the particles, temperature is a measure that represents the average kinetic energy of those particles.
Considering the options provided in the question, thermal energy can be accurately described as the kinetic energy of particles in a system. Notably, thermal energy is a key component of a system's internal energy but is distinct from potential energy, which is another component of internal energy. Temperature measurement, on the other hand, quantifies the concentration of this kinetic energy within the system, providing a direct proportional relationship between temperature and thermal energy at the molecular level.
Among the elements of the main group, the first ionization energy increases
Answer:
Going up the group
Explanation:
In any main group, the first ionization energy increases going up the group, while going down, it decreases.
The reason for that lies in understanding the fundamentals of the Coulombic attraction force. Going down the group, atomic radius increases. When atomic radius increases, the distance between a nucleus and valence electrons increases. According to the Coulomb's equation, force is inversely proportional to the square of the distance. This implies that the greater the radius, the lower the attraction between a nucleus and valence electrons.
Now, the lower the attraction, the lower the energy required to remove the electron.
That said, the first ionization energy increases up the group, as atomic radius decreases.
Answer:
From left to right across a period
Explanation:
It would be nice if you could state the questions so it was easier to tell what your options were, but the answer to this is: “from left to right across a period” something close to that
50 POINTS - Calculate the molar mass for each compound, round off after 2 decimal points. PLEASE SHOW WORK Like this: H2O= 2H(1.00g)+10(15.99g)=17.99 g
1. HCl
2.NaOH
3.K2SO4
4.NO3
5.Ca(OH)2
Answer:
Explanation:
Molar mass:
Molar mass of substance is sum of atomic weight of all the atoms of elements present in it.
HCl
Atomic weight of hydrogen = 1.00 amu
Atomic weight of chlorine = 35.45 amu
Atomic weight of HCl = 1.00+35.45 = 36.45 g/mol
K₂SO4:
Atomic weight of potassium = 39.09× 2 = 78.18 amu
Atomic weight of sulfur = 32.07 amu
Atomic weight of oxygen = 15.99×4 = 63.96 amu
Atomic weight of K₂SO4 = 63.96+32.07+ 78.18 = 174.21 g/mol
Ca(OH)₂:
Atomic weight of calcium = 40.08 amu
Atomic weight of oxygen = 15.99 × 2 amu = 31.98 amu
Atomic weight of hydrogen = 1.00 × 2 = 2.00 amu
Atomic weight of Ca(OH)₂ = 74.06 g/mol
NaOH:
Atomic weight of sodium = 22.99 amu
Atomic weight of oxygen = 15.99 amu
Atomic weight of hydrogen = 1.00 amu
Atomic weight of NaOH = 39.98 g/mol
NO₃:
Atomic weight of nitrogen = 14.01 amu
Atomic weight of oxygen = 15.99×3 = 47.97 amu
Atomic weight of NO₃ = 61.98 g/mol
at 40°c, 50g of KClO3 is dissolved in 100g of water, is this solution saturated, unsaturated, or supersaturated?
Answer:
Supersaturated
Explanation:
Let's define the types of solutions in the context of this problem firstly:
An unsaturated solution is a solution in which addition of more solute would result in dissolution at a given specific temperature. That is, at [tex]40^oC[/tex], if we add more than 50 g of [tex]KClO_3[/tex] and it still dissolves in 100 g of water, then we have an unsaturated solution.A saturated solution is a solution in which we have a maximum amount of a solute that could possibly dissolve in a solvent at a given specific temperature. That is, at [tex]40^oC[/tex], if we add 50 g of [tex]KClO_3[/tex] and no more of it dissolves, then we have a saturated solution.A supersaturated solution is a solution in which we have a greater amount of solute dissolved than we could possibly dissolve under normal circumstances. Let's say that the solubility here is 50 g of [tex]KClO_3[/tex] in 100 g of water at [tex]40^oC[/tex]. If we dissolve more than 50 g, then we have a supersaturated solution.We need to use a solubility curve for salts given below. Notice that the intersection in the y-axis at [tex]40^oC[/tex] is at about 14 g. This means a saturated solution would be obtained if 14 g of [tex]KClO_3[/tex] were dissolved in 100 g of water at this temperature. Anything above it would yield a supersaturated solution, below – an unsaturated solution.
Hence, we have a supersaturated solution.
Describe the relationship between"q" and energy in the melting of an ice cube.
Answer:
Now "q" is the heat and energy is the capacity of any object or body ton perform any work. So we can relate them if we take the term specific heat in consideration.
As specific heat is the the amount of heat required to raise the temperature of an object in specific from one degree Celsius, for ice it is 2.108 kJ/kgK.
Explanation:
c = specific heat capacity,q = heat
ΔT = change in temperature
So, we have:
C= Q/ΔT It is the ratio of the amount of heat energy transferred to an object to the resulting increase in temperature of the object.If the atmospheric pressure in the laboratory is 1.2 atm, how many moles of gas were in each syringe?
Air(H2O) syringe
Room temperature water at 21.3 degrees Celsius
Volume of 5.1 mL
Hydrogen(H2) syringe
Room temperature water at 21.3 degrees Celsius
Volume of 5.2 mL
Answer:
A: 2.525 x 10⁻⁴ mol
B: 2.583 x 10⁻⁴ mol
Explanation:
Part A:
Data Given:
Temperature of water (H₂O) = 21.3°CConvert Temperature to Kelvin
T = °C + 273
T = 21.3 + 273 = 294.3 K
volume of (H₂O) gaseous state = 5.1 mLConvert mL to liter
1000 mL = 1 L
5.1 ml = 5.1/1000 = 0.0051 L
Pressure = 1.2 atmno. of moles = ?Solution
no. of moles can be calculated by using ideal gas formula
PV = nRT
Rearrange the equation for no. of moles
n= PV / RT . . . . . . . . . (1)
where
P = pressure
V = Volume
T= Temperature
n = Number of moles
R = ideal gas constant
where
R = 0.08206 L.atm / mol. K
Now put the value in formula (1) to calculate no. of moles of
n = 1.2 atm x 0.0051 L / 0.08206 L.atm.mol⁻¹. K⁻¹ x 294.3 K
n = 0.0061 atm.L / 24.162 L.atm.mol⁻¹
n = 2.525 x 10⁻⁴ mol
no. of moles of gas (H₂O) = 2.525 x 10⁻⁴ mol
_______________
Part B:
Data Given:
Temperature of water (H₂) = 21.3°CConvert Temperature to Kelvin
T = °C + 273
T = 21.3 + 273 = 294.3 K
volume of (H₂) gas = 5.2 mLConvert mL to liter
1000 mL = 1 L
5.2 ml = 5.2/1000 = 0.0052 L
Pressure = 1.2 atmno. of moles = ?Solution
no. of moles can be calculated by using ideal gas formula
PV = nRT
Rearrange the equation for no. of moles
n= PV / RT . . . . . . . . . (1)
where
P = pressure
V = Volume
T= Temperature
n = Number of moles
R = ideal gas constant
where
R = 0.08206 L.atm / mol. K
Now put the value in formula (1) to calculate no. of moles of
n = 1.2 atm x 0.0052 L / 0.08206 L.atm.mol⁻¹. K⁻¹ x 294.3 K
n = 0.0062 atm.L / 24.162 L.atm.mol⁻¹
n = 2.583 x 10⁻⁴ mol
no. of moles of gas (H₂) = 2.583 x 10⁻⁴ mol
Water has a boiling point of 100.0°C and a Kb of 0.512°C/m. What is the boiling
point of a 8.5 m solution of Mg3(PO4)2 in water?
Answer:
104.352°C
Explanation:
Data Given:
Boiling point of water = 100.0°C
Kb (boiling point constant = 0.512°C/m
Concentration of the Mg₃(PO₄)₂ = 8.5 m
Solution:
Formula Used to find out boiling point
ΔTb = m.Kb . . . . . . (1)
where
ΔTb = boiling point of solution - boiling point of water
So,
we can write equation 1 as under
ΔTb = Tb (Solution) -Tb (water)
As we have to find out boiling point so rearrange the above equation
Tb (Solution) = m.Kb + Tb (water) . . . . . . . (2)
Put values in Equation 2
Tb (Solution) = (8.5 m x 0.512°C/m ) + 100.0°C
Tb (Solution) = 4.352 + 100.0°C
Tb (Solution) = 104.352°C
so the boiling point of Mg₃(PO₄)₂ 8.5 m solution = 104.352°C
Choose all the right answers. Which are correct functions of the cell membrane? allows oxygen to enter allows carbon dioxide to enter stops harmful chemicals from entering stops harmful chemicals from exiting acts like a gate keeper
Answer:
The correct functions of the cell membrane are:
allows oxygen to enter allows carbon dioxide to enter stops harmful chemicals from entering acts like a gate keeperExplanation:
The cell membrane is known to be the gatekeeper of a cell. This is because it selectively regulates which materials to let enter into a cell and which materials need to be exited from the cell. Gases like oxygen and carbon dioxide can easily pass through the cell membrane by diffusion. The cell membrane stops the entry of any kind of harmful component into the cell hence, protecting the cell.
The cell membrane is a vital component for the cell's survival. It lets in oxygen and carbon dioxide, stops harmful substances from coming in, and acts as a barrier or gatekeeper; however, it doesn't prevent harmful substances from exiting the cell.
Explanation:The cell membrane, also known as the plasma membrane, has several vital functions in maintaining the life and health of a cell. This includes allowing useful substances like oxygen and carbon dioxide to enter and exit, acting as a protective barrier to prevent harmful chemicals from entering the cell and allowing certain substances to exit, hence acting like a 'gatekeeper'. Therefore, the correct answers are 'allows oxygen to enter', 'allows carbon dioxide to enter', 'stops harmful chemicals from entering' and 'acts like a gatekeeper'. It does not, however, 'stop harmful chemicals from exiting', as the membrane cannot differentiate between harmful or beneficial when it comes to exiting.
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I'll give brainliest
why the total energy of electron is negative
Answer:
Electrons are always marked negative Hence electronic energy is also always taken as negative. It is because when an electron is at infinite distance from nucleus , there the kinetic energy of that electron can not be calculated. So, it is taken to be zero . ... And thus the energy of electron becomes less negative
V.T2 = V2T, is an expression of
Boyle's Law
Dalton's Law
The Ideal Gas Law
Charles' Law
Answer:
It corresponds to Charles' Law
Explanation:
Charles's Law corresponds to one of the gas laws, where temperature and volume are related, to constant pressure. That is, according to said equation, the volume of a gas varies directly with the temperature, under conditions of constant pressure.