Answer:
Molarity = 0.01 M
Explanation:
Molarity is used to measure the concentration of a solution. It will be same for the whole solution or a small amount of solution if the solution is homogeneous.
So, Molarity of 200 mL of solution = Molarity of 50 mL of solution
[tex]\mathbf{Molarity = \frac{number \ of \ moles \ of \ solute}{Volume \ of \ solution \ (in \ liters)}}[/tex]
[tex]\mathbf{Moles = \frac{given \ mass \ of \ compound}{molar \ mass \ of \ compound}}[/tex]
given mass of aspirin = 360 mg = 0.36 g
molar mass of aspirin = 180 g
Volume of solution = 200 mL = 0.2 L
[tex]\mathrm{Mole \ of \ Aspirin = \frac{0.36}{180} = \mathbf{0.002 \ moles}}[/tex]
[tex]\mathrm{Molarity = \frac{0.002}{0.2} = \mathbf{0.01 \ M}}[/tex]
Therefore, Molarity = 0.01 M
50. mL of a sample prepared by dissolving 360. mg of aspirin in 200. mL of solution, has a molarity of 0.0100 M.
First, we will convert 360. mg (0.360 g) to moles of aspirin using its molar mass (180. g/mol).
[tex]0.360 g \times \frac{1mol}{180. g} = 2.00 \times 10^{-3} mol[/tex]
2.00 × 10⁻³ moles of aspirin are dissolved in 200. mL (0.200 L) of solution. The molarity of the solution is:
[tex]M = \frac{2.00 \times 10^{-3} mol}{0.200 L} = 0.0100 M[/tex]
The molarity is an intrinsic property, so a 50. mL sample will have the same molarity as the 200. mL solution.
50. mL of a sample prepared by dissolving 360. mg of aspirin in 200. mL of solution, has a molarity of 0.0100 M.
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When a supply of hydrogen gas is held in a 4 liter container at 47°C it exerts a pressure
of 800 torr. The supply is moved to a 2000 mL container, and cooled to -113°C. What is
the new pressure of the confined gas?
Answer:
P₂ = 800 torr
Explanation:
Given data:
Initial Volume = 4 L
Initial Temperature = 47°C (47+273= 320 K)
Initial pressure = 800 torr
Final volume = 2000 mL (2000/1000 = 2 L)
Final temperature = -113°C (-113+273 =160 K )
Final pressure = ?
Solution:
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
Solution:
P₂ = P₁V₁ T₂/ T₁ V₂
P₂ = 800 torr × 4 L × 160 K / 320 K × 2 L
P₂ = 512000 torr .L. K / 640 k.L
P₂ = 800 torr
The new pressure of the confined gas is 800 torr.
General gas equation
The new pressure of the gas is calculated by applying general gas equation as shown below;
[tex]\frac{P_1V_1 }{T_1} = \frac{P_2 V_2}{T_2} \\\\P_2 = \frac{P_1V_1 T_2}{T_1V_2}[/tex]
where;
P1 is 800 torrT1 is 47⁰C = 320 KV₁ is 4 LitersT₂ is -113⁰C = 160 KV₂ is 2000 mL = 2 LitersP₂ is ?The new pressure of the confined gas is calculated as follows;
[tex]P_2 = \frac{800 \times 4 \times 160}{320 \times 2} \\\\P_2= 800 \ torr[/tex]
Thus, the new pressure of the confined gas is 800 torr.
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How many atoms in 14.5 moles of gold?
Answer:
87.29×10²³ atoms
Explanation:
Nᴀ=6.02×10²³ (constant)
N=n×Nᴀ=14.5×6.02×10²³=87.29×10²³
How many particles would be in 0.5 moles?
Answer:
3.011 × 10²³ particles
Explanation:
Given data:
Number of moles = 0.5 mol
Number of particles = ?
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
one mole of substance = 6.022 × 10²³ particles
For 0.5 mole of substance:
0.5 mol × 6.022 × 10²³ particles / 1 mol
3.011 × 10²³ particles
What is Uniformitarianism?
What are the chemical properties of beryllium phosphide??
Answer:
Forms ionic bonds, insoluble, doesn't participate in single or double displacement reactions, non-reactive, high heat of combustion
Explanation:
Beryllium is a metal, since it belongs to group 2A, the alkaline earth metals. It has a total of 2 valence electrons.
Phosphorus, on the other hand, belongs to group 5A and has a total of 5 valence electrons.
We have a compound which has a metal in it, therefore, it's an ionic compound. Beryllium, our metal, loses its 2 electrons to gain an octet and phosphorus, our nonmetal, should gain 3 electrons to have an octet. The oxidation states are +2 and -3 respectively. This means we need 3 beryllium cations and 2 phosphide anions in our formula [tex]Be_3P_2[/tex].
Beryllium phosphide would be expected to be insoluble, as only beryllium chloride, fluoride, nitrate, phosphate and sulfate are soluble substances, while the remaining ones are expected to be insoluble.
Due to its insolubility, beryllium phosphide would not participate in any ionic reactions, such as single displacement or double displacement.
Since it's insoluble, we expect this compound to be chemically stable and not reactive. This implies that if we wanted to burn it, the heat of combustion would be very high, as a lot of energy would be needed to be supplied in an endothermic reaction in order to burn it.
How many moles of chlorine (Cl) atoms are in a sample of 1.72 × 1022 atoms?
a. 0.0286 mol Cl
b. 35.0 mol Cl
c. 1.03 × 1023 mol Cl
d. 1.04 × 1046 mol Cl
Answer:
0.0286 mol Cl
Explanation:
to convert atoms to moles, we need Avogadro's number.
1 mol= 6.02 x 10^23 atoms
1.72 x 10^22 atoms (1 mol/ 6.02 x 10^23)= 0.0286 moles
How is the seismic risk of an area estimated
What are the products of this reaction? (High temperature)
Na2SO4 * 10H2O + C —> ????
Answer:
A chemical equation can be described as a symbolic representation of a chemical reaction. It can be written in the form of words or symbols.
The following chemical reaction can be completed as :
Na2SO4·10H2O + 2C = Na2S + 10H2O + 2CO2
Sodium Sulfate Decahydrate + Diamond = Sodium Sulfide + Water + Carbon Dioxide
The products of the reaction are:
Sodium Sulfide (Na2S)Water (H2O)Carbon dioxide (CO2)If pressure is kept constant and the temperature of a gas is doubled, what will happen to the volume?
Answer:the volume will be doubled
Explanation: the expression from the question clearly indicates Charles' law. Charles' law states that volume is proportional to temperature at constant pressure. This simply means as one variable increase, the other variable will also increase. Please see attachment for mathematical explanation
Calculate the formula unit mass of NaHCO3. (At. Mass of Na=23u, H=1u, C=12u, O=16u)
Answer:
Formula unit mass of [tex]NaHCO_{3}[/tex] is 84 u.
Explanation:
Formula unit mass can be calculated by the adding individual element mass in the formula of the compound.
The given compound - [tex]NaHCO_{3}[/tex]
From the given the atomic mass of each element in the given compound is as follows.
Atomic mass of sodium (Na) = 23 u
Atomic mass of Hydrogen (H) = 1 u
Atomic mass of carbon (c) = 12 u
Atomic mass of oxygen (O) = 16 u
The number of atoms in the formula:
1 sodium atom =23 u
1 hydrogen atom = 1 u
1 carbon atom = 12 u
3 oxygen atom = 3 X 16 u = 48 u
_____________________________
Formula mass = 84 u
_______________________________
Therefore, Formula unit mass of [tex]NaHCO_{3}[/tex] is 84 u.
how many atoms are in the 1.5 moles of tin atoms?
2.5x10^24 atoms
7.5x10^1 atoms
9.0x10^23 atoms
1.7x10^23 atoms
Answer:
option C = 9.0 x 10²³ atoms
Explanation:
Data Given:
no. of moles of tin (Sn) atoms = 1.5 moles
no. of tin (Sn) atoms = ?
Solution:
Formula used to find number of atoms
no. of moles = no. of atoms / Avogadro's number
Rearrange the above equation:
no. of atoms = no. of moles x Avogadro's number . . . . . . (1)
Where
Avogadro's number = 6.022 x 10²³
Put values in equation 1
no. of atoms = 1.5 x 6.022 x 10²³
no. of atoms = 9.033 x 10²³
Round the figure = 9.0 x 10²³ atoms
So option C is correct
How many carbon atoms are there in the empirical formula corresponding to C10H22O2?
Answer:
Imma Explanation:
Under which conditions is lactic-acid fermentation most likely to occur?
A. playing video games
B. a long walk
C. sleeping
D. a very fast run
Answer:
D. a very fast run
Explanation:
Fermentation :
The second step of anaerobic respiration is fermentation. It involve the fermentation of pyruvate into lactic acid or alcohol depending upon the organism in which it is taking place. There is no ATP produced, however carbon dioxide is released in this step.
Anaerobic respiration in plants:
Anaerobic respiration in plants produced ethanol which if accumulate then cause the harmful effect in plants. It is also occur in some microorganisms such as yeast.
C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂
Anaerobic respiration in animals:
Anaerobic respiration in animals pyruvate converted into lactic acid and it is not as harmful as ethanol in plant if accumulate. It is produced during exercise because oxygen is not supplied to muscles. It can produce the cramps which can be cured with massage.
C₆H₁₂O₆ → 2C₃H₆O₃
For hydrated copper (II) sulfate calculate the mass percentage of water in your hydrated crystals.
Answer:
56.44 %
Explanation:
The formula of copper(II) sulfate pentahydrate is [tex]CuSO_4\cdot 5H_2O[/tex].
In order to calculate the mass percentage of water in it, we may assume that we have 1 mol of copper(II) sulfate pentahydrate. In general, the mass percentage is a ratio between the mass of a component and the total mass of the compound expressed in percent:
[tex]\omega = \frac{m_c}{m_t}\cdot 100 \%[/tex]
Since we're taking 1 mole of a substance here, we may state that the mass percentage of water will be calculating using molar masses instead:
[tex]\omega_{H_2O} = \frac{5M_{H_2O}}{M_{CuSO_4\cdot 5 H_2O}}\cdot 100 \%[/tex]
Notice that we take 5 molar masses of water, as 1 mole of copper(II) sulfate pentahydrate contains 5 moles of water molecules, then:
[tex]\omega_{H_2O} = \frac{5\cdot 18.016 g/mol}{159.609 g/mol}\cdot 100 \% = 56.44 \%[/tex]
1.
When a basketball player jumps to make a shot, _____.
the force with which he jumps is equal to the force with which he shoots the ball
the downward force on the floor is equal to the upward force on his feet
the forces on the player’s feet and on the floor are both in the upward direction
the action-reaction forces are unequal because they act on different objects
Answer:
When a basketball player jumps to make a shot, _____
The downward force on the floor is equal to the upward force on his feet
Explanation:
According to Newton's Third Law of motion :
For every action there is equal and opposite reaction .
Hence when the basketball player jumps to make a shot, The gravity (downward force) and his energy (upward force on his feet) exert equal forces on each other in opposite directions.
What electron could have quantum numbers n=4 l=2 ml= -2 ms= 1/2
Answer:
4d¹ electron has quantum numbers
n=4; l=2; ml= -2; ms= 1/2
Explanation:
There are 4 quantum numbers, namely
the principal quantum number (n)
the orbital angular momentum quantum number (l)
the magnetic quantum number (ml)
the electron spin quantum number (ms)
The principal quantum number describes the orbit or shell of the electron
here n = 4 ⇒ electron is in 4th shell
the orbital angular momentum quantum number describes the shape of orbital the electron is present in.
l= 0 ⇒ s-orbital
l= 1 ⇒ p-orbital
l= 2 ⇒ d-orbital
l= 3 ⇒ f-orbital
In our case l= 2 ⇒ p-orbital
ml specifies in which orbital electron is present of given shape
ml has 2l+1 values,which range from -1 to +l
here l = 2 ⇒ ml has 2(2)+1 = 5 values (-2 to +2)
so electron is present in one of the five d-orbitals
ms represents the spin of electron (+1/2 or -1/2)
If +1/2 represents clockwise then -1/2 represents anti-clockwise and vice-versa.
⇒ 4d¹ electron has quantum numbers
n=4; l=2; ml= -2; ms= 1/2.
An electron with quantum numbers n=4, l=2, ml=-2, ms=1/2 is located in the fourth energy level of an atom, within a 'd' shaped orbital pointing in a predetermined space direction, with an upward spin.
Explanation:The student's question refers to a specific electron in an atom characterized by four quantum numbers: principal quantum number (n=4), azimuthal quantum number (l=2), magnetic quantum number (ml=-2), and spin quantum number (ms=1/2). These quantum numbers reveal the electron's energy level, shape, orientation in space, and spin direction, respectively.
Therefore, an electron with these quantum numbers is found in the fourth energy level (n=4) of an atom. The shape of the orbital where this electron is located is a 'd' orbital (l=2). The negative sign of the magnetic quantum number reveals that the orbital is oriented in one of the five spatial orientations possible for 'd' orbitals. Lastly, the spin quantum number of 1/2 means the electron's spin is up.
This shows the student's question is related to quantum mechanics studies in chemistry and physics, specifically atomic structure and electron configuration.
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Do exponents need to be the same when multiplying in scientific notation?
Answer:
Not necessarily
Explanation:
The answer would be: not necessarily, there is no such requirement.
Whenever we're multiplying in scientific notation, we may simply multiply the numbers separately and the rest separately. Let's say that in a general case we have two numbers:
[tex]n_1 = a \cdot 10^b[/tex]
[tex]n_2 = c \cdot 10^d[/tex]
In order to multiply them, we:
multiply the numbers a and c firstly;multiply the 10s now applying the rule [tex]10^b\cdot 10^d = 10^{b + d}[/tex];multiply result from the step 1 by the result in step 2.Let's apply this for some specific example, say, we have:
[tex]n_1 = 2\cdot 10^3[/tex]
[tex]n_2 = 3\cdot 10^4[/tex]
multiplying 2 and 3: [tex]2\cdot 3 = 6[/tex];multiplying the 10s: [tex]10^3\cdot 10^4 = 10^{3 + 4} = 10^7[/tex];multiplying the two results: [tex]6\cdot 10^7[/tex]What mass of Neon gas is needed to occupy 2.56 L tube at STP?
Answer:
Mass = 2.222 g
Explanation:
Given data:
Volume of neon gas = 2.56 L
Temperature = 273 K
Pressure = 1 atm
Mass of neon gas = ?
Solution:
PV = nRT
n = PV / RT
n = 1 atm × 2.56 L/ 0.0821 atm. L / mol. K× 273 K
n = 2.56 L.atm / 22.4 atm. L/ mol
n = 0.11 mol
Mass = number of moles × molar mass
Mass = 0.11 mol × 20.2 g/mol
Mass = 2.222 g
Together, respiration and photosynthesis keep the levels of carbon dioxide and oxygen in the atmosphere _____.
A. fairly constant
B. always changing
C. decreasing
D. increasing
Answer:
A. fairly constant
Explanation:
In photosynthesis plants used carbon dioxide and produced oxygen while in respiration oxygen is taken and carbon dioxide is released thus level of both gases remain constant.
Aerobic respiration
It is the breakdown of glucose molecule in the presence of oxygen to yield large amount of energy. Water and carbon dioxide are also produced as a byproduct.
Glucose + oxygen → carbon dioxide + water + 38ATP
Photosynthesis:
It is the process in which in the presence of sun light and chlorophyll by using carbon dioxide and water plants produce the oxygen and glucose.
Carbon dioxide + water + energy → glucose + oxygen
water is supplied through the roots, carbon dioxide collected through stomata and sun light is capture by chloroplast.
Chemical equation:
6H₂O + 6CO₂ + energy → C₆H₁₂O₆ + 6O₂
How does the circulatory system help our cells
how much momentum does a 2000kg elephant have that is charging at 11m/s
Answer:
P = 22000 kg. m/s
Explanation:
Given data;
Mass of elephant = 2000 Kg
Velocity = 11 m/s
Momentum = ?
Solution:
Momentum is the product of mass and velocity of an object.
It can be calculated from given formula:
P = mv
P = momentum
m = mass
v = velocity
Now we will put the values in formula.
P = 2000 Kg × 11 m/s
P = 22000 kg. m/s
Examine the general structure of a molecule.
Which functional groups are in this molecule?
an alkyl halide and an alcohol
a carboxylic acid and an amine
an amine and an ester
an aldehyde and a carboxylic acid
Answer:
a carboxylic acid and an amine
Explanation:
A functional group is an atom or group of atoms inside a molecule that has comparable chemical properties anytime it appears in numerous compounds. When other parts of the molecule are not similar, some functional groups react in certain manners.
Carboxylic acid is a carbonyl-containing functional group, with carbon atom bonded to an hydroxyl group on one side and on the other side is either a carbon or hydrogen atom.
An amine group is composed of a nitrogen atom bonded to a combination of carbon and hydrogen atoms.
They are solids liquids or gases room temperature. Is that metals or non metal
Answer:
Mercury is the only metal that's liquid at room temperature, bromine and iodine are the other
Explanation:
11 elements are gases
Others are solid
Answer:
Explanation:
the question is a bit confusing, but if i'm understanding correctly the answer is non-metals... some non-metals are gasses (all of the noble gasses), some are liquid (mercury and bromine), and some are solids (all the rest).
however, not all metals are solid at room temp, there are a few exceptions.
34. According to Bohr's theory, an electron's path around the nucleus defines its
a. speed.
c. atomic mass.
b. electric charge.
d. energy level
Answer:
According to Bohr's theory, an electron's path around the nucleus defines its
energy level.
Explanation:
It the certain energy by which the electrons have occupied there place in the orbitals. They can also be moved to the higher energy level by taking the energy from the surrounding. The emission of light can be seen when the electron falls from the higher energy state to the lower state. The orbital that is close to the atomic centre having the lowest energy level and the one that is found to be far away from the atomic centre has the highest energy level.
According to Bohr's theory, an electron's path around the nucleus defines its
d. Energy level.
According to Bohr's theory:It the specific energy by which the electrons have involved there place in the orbitals. They can likewise be moved to the higher energy level by taking the energy from the encompassing. The outflow of light should be visible when the electron tumbles from the higher energy state to the lower state. The orbital that is near the nuclear focus having the most reduced energy level and the one that is viewed as distant from the nuclear focus has the most noteworthy energy level.
Thus, correct option is d.
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Cathy is using a high-powered microscope to look at a leaf. What does she see?
A
nothing
B. bark
C. bones
D.
cells
Answer:
Cells
Explanation:
High-powered microscopes are used in order to see microscopical (extremely small) structures of objects that cannot be seen with a naked eye.
When we look at a leaf, we will see the composition of it and the structural patterns that we couldn't see clearly or at all without a microscope.
Leaves consist of cells and spores (stomata) between the cells. Using a microscope will enable us to see them.
A measurement 172.54 m rounded to three significant figures is
Cacl2+na3po4 ca3po42 + nacl
3CaCl₂ + 2Na₃PO₄→ Ca₃(PO₄)₂ + 6NaCl
Explanation:We are given the Equation;
CaCl₂ + Na₃PO₄→ Ca₃(PO₄)₂ + NaCl
Assuming the question requires us to balance the equation;
A balanced chemical equation is one that has equal number of atoms of each element on both sides of the equation.Balancing chemical equations ensures that they obey the law of conservation of mass in chemical equations.According to the law of conservation of mass in chemical equation, the mass of the reactants should always be equal to the mass of the products.Balancing chemical equations involves putting appropriate coefficients on the reactants and products.In this case;
To balance the equation we are going to put the coefficients 3, 2, 1, and 6.Therefore; the balanced equation will be;3CaCl₂ + 2Na₃PO₄→ Ca₃(PO₄)₂ + 6NaCl
Which substance is oxidized and which is reduced in this reaction?
Cl2 + 2HBr → 2HCl + Br2
A) HBr oxidized; HCl reduced
B) HCl oxidized; Cl2 reduced
C) Br2 oxidized; HBr reduced
D) Cl2 and Br2 oxidized; HBr reduced
In this reaction, Cl2 is reduced to form HCl and HBr is oxidized to form Br2.
Explanation:In this reaction, Cl2 is being reduced to form HCl, and HBr is being oxidized to form Br2. The substance being reduced gains electrons, while the substance being oxidized loses electrons.
Cl2 + 2HBr → 2HCl + Br2
Cl2 is the oxidizing agent because it causes the oxidation of HBr, and HBr is the reducing agent because it causes the reduction of Cl2. The oxidizing agent is the species that gets reduced, while the reducing agent is the species that gets oxidized.
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Final answer:
In the reaction Cl2 + 2HBr → 2HCl + Br2, HBr is oxidized and Cl2 is reduced, making the correct choice A) HBr oxidized; HCl reduced.
Explanation:
In the reaction Cl2 + 2HBr → 2HCl + Br2, the substance being oxidized is HBr and the substance being reduced is Cl2. According to the provided half-reactions, oxidation involves the loss of electrons, and in this case, Br− (from HBr) loses electrons to form Br2. Conversely, the reduction involves the gain of electrons where Cl2 gains electrons to form 2Cl− (from HCl).
Therefore, the answer to the question is that HBr is oxidized; Cl2 is reduced, making the correct choice: A) HBr oxidized; HCl reduced. The oxidizing agent is Cl2 and the reducing agent is Br− from HBr.
Describe an experiment for the preparation and collection of Oxygen sodium peroxide
Answer:
Making oxygen
Oxygen can be made from hydrogen peroxide, which decomposes slowly to form water and oxygen:
hydrogen peroxide → water + oxygen
2H2O2(aq) → 2H2O(l) + O2(g)
The rate of reaction can be increased using a catalyst, manganese(IV) oxide. When manganese(IV) oxide is added to hydrogen peroxide, bubbles of oxygen are given off.
Apparatus arranged to measure the volume of gas in a reaction. Reaction mixture is in a flask and gas travels out through a pipe in the top and down into a trough of water. It then bubbles up through a beehive shelf into an upturned glass jar filled with water. The gas collects at the top of the jar, forcing water out into the trough below.
To make oxygen in the laboratory, hydrogen peroxide is poured into a conical flask containing some manganese(IV) oxide. The gas produced is collected in an upside-down gas jar filled with water. As the oxygen collects in the top of the gas jar, it pushes the water out.
Instead of the gas jar and water bath, a gas syringe could be used to collect the oxygen.
magnetic striping is evidence of
Answer:
sea floor spreading
Explanation: hfhgg