A sample of fluorine gas exerts a pressure of 900 mmHg. When the pressure is changed to 1140 mmHg, the volume is 250 mL. What was the original volume?
Which of these statements best describes the relationship between matter, pure substances, and mixtures?
A. Pure substances can be divided into two groups; matter and mixtures.
B. Matter can be divided into two groups; pure substances and mixtures.
C. Mixtures and matter are two of many different types of pure substances.
D. Pure substances and matter are two of many different types of mixtures.
The answer is: B. Matter can be divided into two groups; pure substances and mixtures.
Pure substance is made of only one type of atom or only one type of molecule, it has definite and constant composition with distinct chemical properties.
For example, aluminium is an element and ammonia is compound.
Mixtures are physical combinations of pure substances that have no definite or constant composition.
If two cars get a 4 way stop intersection at the same time, which car should be yeiled the right of way
If two cars get a 4 way stop intersection at the same time, the car on the right should be yielded the right of way. This is known as the "right-of-way rule."
The right-of-way rule is a traffic law that determines which vehicle has the right to proceed first at an intersection.
-When two vehicles arrive at a 4-way stop intersection at the same time, the vehicle on the right has the right of way and should proceed first.
-If the two vehicles arrive at the same time and are facing each other, the vehicle going straight has the right of way over the vehicle turning left.
The right-of-way rule is important for safety reasons. It helps to prevent accidents and reduce traffic congestion by providing a clear and consistent way to determine which vehicle has the right to proceed first.
Therefore, the car on the right should be yielded the right of way.
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Which two particles re most similar in mass?
what is the systematic study of the natural world
Liquid nitrogen has different properties from gaseous nitrogen. Is it a chemical change when liquid nitrogen warms to gaseous nitrogen?
a distance of one centimeter is the same as ?
a. 100m
b. 10m
c. .01m
d. 1000 m
In multicellular organisms the process of cell division leads to what
A structure containing at least 2 different types of tissue that work together for a common purpose is
Answer:
it is an organ it is a structure containing at least 3 different types of tissue that works together for a common purpose
what is the difference between cytokinesis and mitosis
Mitosis and cytokinesis are two processes in the cell division cycle. Mitosis refers to the division of the cell nucleus and occurs before cytokinesis. Cytokinesis is the final step that divides the cell into two separate daughter cells.
Explanation:Mitosis and cytokinesis are two crucial processes in the cell division cycle. Mitosis refers to the division of the nucleus, where the contents of the nucleus get divided equitably and distributed between its two halves. This process is divided into four major stages: prophase, metaphase, anaphase, and telophase.
Cytokinesis, however, occurs after mitosis and is the process that divides the cell's cytoplasm and body into two separate cells, becoming the final step in the cell division process. In animal cells, this usually begins during the late anaphase and involves a contractile ring composed of actin filaments. For plant cells, which have cell walls, the process is a bit different.
So basically, mitosis is the process by which the cell nucleus divides, whereas cytokinesis is the process that completes cell division by splitting the cell itself into two new cells.
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It’s laundry day at Dan’s house, so he plugs in his electric iron. What transformation of energy takes place inside the iron? The iron converts energy into energy.
Answer: Electrical and Thermal.
Explanation:
Consider the reaction 2AI(OH)3 + 3H2SO4 mc006-1.jpg X + 6Y. What are X and Y?
X = AI2(SO4)3; Y = H2O
X = AI2(SO4)3; Y = H2
X = AI2(SO3)3; Y = H2O
X = AI2(SO3)3; Y = H2
Answer is: X = Al₂(SO₄)₃; Y = H₂O.
Balanced chemical reaction:
2Al(OH)₃ + 3H₂SO₄ → Al₂(SO₄)₃ + 6H₂O.
Al(OH)₃ is aluminium hydroxide.
H₂SO₄ is sulfuric acid.
Al₂(SO₄)₃ is salt aluminium sulfate. Aluminium has oxidation number +3 and sulfate has charge -2.
H₂O is water.
Acids and bases when react (neutralisation) produce salt and water.
The value of X and Y in the equation is:
A. The value of X is Al₂(SO₄)₃
B. The value of Y is H₂O
What is a chemical equationChemical equations are representations of chemical reactions using symbols and formula of the reactants and products.
The reactants are located on the left side while the products are located on the right side.
Reactants —> Products
How to determine X and YTo determine the value of X and Y, we shall write the balanced equation for the reaction. This is given below:
2Al(OH)₃ + 3H₂SO₄ → X + 6Y
Al(OH)₃ + H₂SO₄ → Al₂(SO₄)₃ + H₂O
There are 2 atoms of Al on the right side and 1 atom on the left. It can be balanced by writing 2 before Al(OH)₃ as shown below:
2Al(OH)₃ + H₂SO₄ → Al₂(SO₄)₃ + H₂O
There are a total of 8 atoms of H on the left side and 2 atoms on the right side. It can be balanced by writing 3 before H₂SO₄ and 6 before H₂O as shown below:
2Al(OH)₃ + 3H₂SO₄ → Al₂(SO₄)₃ + 6H₂O
Now, the equation is balanced.
Comparing the above balance equation with:
2Al(OH)₃ + 3H₂SO₄ → X + 6Y
The value of X and Y is:
X = Al₂(SO₄)₃Y = H₂OLearn more about chemical equation:
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What is the ∆G for the following reaction under standard conditions (T = 298 K) for the formation of NH4NO3(s)? 2NH3(g) + 2O2(g) NH4NO3(s) + H2O(l) Given: NH4NO3(s): ∆Hf = -365.56 kJ ∆Sf = 151.08 J/K. NH3(g): ∆Hf = -46.11 kJ ∆Sf = 192.45 J/K. H2O(l): ∆Hf = -285.830 kJ ∆Sf = 69.91 J/K. O2(g): ∆Hf = 0.00 kJ ∆Sf = 205 J/K. 186.6 kJ 6.9 kJ -10.4 kJ -126.3 kJ -382 kJ
Answer: The [tex]\Delta G[/tex] for the reaction is -382 kJ.
Explanation:
For the following reaction:
[tex]2NH_3(g)+2O_2(g)\rightarrow NH_4NO_3(s)+H_2O(l)[/tex]
Equation used to calculate [tex]\Delta H_{rxn}[/tex] is:[tex]\Delta H_{rxn}=\sum \Delta H_{products}-\sum \Delta H_{reactants}[/tex]
We are given:
[tex]\Delta H_{NH_3}=-46.11kJ/mol\\\Delta H_{O_2}=0.00kJ/mol\\\Delta H_{NH_4NO_3}=-365.56kJ/mol\\\Delta H_{H_2O}=-285.830kJ/mol[/tex]
[tex]\Delta H_{rxn}[/tex] for the reaction is calculated by:
[tex]\Delta H_{rxn}=[1(\Delta H_{NH_4NO_3})+1(\Delta H_{H_2O})]-[2(\Delta H_{NH_3})+2(\Delta H_{O_2})][/tex]
Putting values in above equation, we get:
[tex]\Delta H_{rxn}=[1(-365.56)+1(-285.83)]-[2(-46.11)+2(0)]kJ\\\\\Delta H_{rxn}=-559.17kJ=559170J[/tex]
Equation used to calculate [tex]\Delta S_{rxn}[/tex] is:[tex]\Delta S_{rxn}=\sum \Delta S_{products}-\sum \Delta S_{reactants}[/tex]
We are given:
[tex]\Delta S_{NH_3}=192.45J/K\\\Delta S_{O_2}=205J/K\\\Delta S_{NH_4NO_3}=151.08J/K\\\Delta S_{H_2O}=69.91J/K[/tex]
[tex]\Delta S_{rxn}[/tex] for the reaction is calculated by:
[tex]\Delta S_{rxn}=[1(\Delta S_{NH_4NO_3})+1(\Delta S_{H_2O})]-[2(\Delta S_{NH_3})+2(\Delta S_{O_2})][/tex]
Putting values in above equation, we get:
[tex]\Delta S_{rxn}=[1(151.08)+1(69.91)]-[2(192.45)+2(205)]J/K\\\\\Delta S_{rxn}=-573.91J/K[/tex]
Now, to calculate [tex]\Delta G[/tex], the equation used is:[tex]\Delta G=\Delta H-T\Delta S[/tex]
We are given:
[tex]\Delta H=-559170J\\T=298K\\\Delta S=-573.91J/K\\[/tex]
Putting values in above equation, we get:
[tex]\Delta G=(-559170J)-[298K\times (-573.91J/K)]\\\\\Delta G=-382kJ[/tex]
Hence, the [tex]\Delta G[/tex] for the reaction is -382 kJ.
Tungsten is used in light bulbs because its high...
Answer:
[tex]\large \boxed{\mathrm{melting \ point}}[/tex]
Explanation:
Tungsten is used in light bulbs because its high melting point. Tungsten has a high melting point of [tex]\sf 3422 \ \°C[/tex].
Tungsten also has the lowest vapor pressure and the highest tensile strength out of all the metals.
How much heat is absorbed when 2.8 mol NH4NO3 is dissolved in water? The molar heat of solution of NH4NO3 is 25.7 kJ/mol.
Final answer:
To find the heat absorbed by the dissolution of 2.8 moles of NH4NO3, multiply the amount of substance by its molar heat of solution, yielding 71.96 kJ.
Explanation:
To calculate the amount of heat absorbed when 2.8 moles of NH4NO3 are dissolved in water, you multiply the number of moles by the molar heat of solution. The molar heat of solution for NH4NO3 is 25.7 kJ/mol.
The calculation is as follows:
Heat absorbed = Number of moles × Molar heat of solutionHeat absorbed = 2.8 mol × 25.7 kJ/molHeat absorbed = 71.96 kJTherefore, the dissolution of 2.8 moles of NH4NO3 in water absorbs 71.96 kJ of heat.
When 2.8 mol NH₄NH₃ is dissolved in water, 71.96 kJ of heat is absorbed.
To determine how much heat is absorbed when 2.8 mol NH₄NH₃ is dissolved in water, use the given molar heat of solution.
Dissolution Process:
NH₄NH₃ (s) → NH4⁺ (aq) + NO₃⁻ (aq)
The molar heat of solution for NH₄NH₃ is 25.7 kJ/mol.
Multiply the amount of NH₄NH₃ (in moles) by its molar heat of solution:Heat absorbed = 2.8 mol NH₄NH₃ × 25.7 kJ/mol = 71.96 kJHence, 71.96 kJ of heat is absorbed when 2.8 mol of NH₄NH₃ is dissolved in water.
What was the major weakness of Wegener's theory of continental drift
Alfred Wegener proposed the continental drift theory in four reasons. One, he hypothesized that the continents were once a giant continent. Two, he observed that there are fossils found of the same kind in the different locations. Three, he found that the edge of opposing continents somehow fits if they are combined, almost like a puzzle. And four, there are glacial scars that are left behind by a larger glacial continent. His greatest weakness of Alfred Wegeners’ continental drift theory was he could not explain what kind of force that caused this continents to move far from each other.
Which refers to the amount of a solute that will dissolve in a given volume of solvent at a given temperature and pressure
Answer:
The correct answer is solubility.
Explanation:
Solubility is illustrated as the maximum concentration of solute, which can be dissolved in a given amount of solvent at a specific pressure and temperature. Each solute exhibits a specific solubility. The solubility is generally articulated in the form of solute per 100 ml or grams or solvent, at a specific temperature and pressure.
Mr. Adams asked his students to write the chemical symbols for the element zinc. He wrote the student's answers on the whiteboard. Which answer is correct?
Answer:
The chemical symbol of zinc element is Zn.
Explanation:
The chemical symbol of zinc element is 'Zn'.
Zinc is a metal belonging 3-d transition series metal with atomic number 30 and atomic mass of 65.38 g/mol. It has blue silvery appearances.
The electronic configuration of Zinc:
[tex\]Zn=[Ar]3d^{10}4s^2[/tex]
How many moles of carbon dioxide are produced when 0.2 mol of sodium carbonate reacts with excess hydrochloric acid?
What is the mass of exactly 1 mol of the following elements osmium, Cesium, krypton
Answer: The mass of osmium is 190.23 g/mol, cesium is 132.9 g/mol and that of krypton is 83.8 g/mol
Explanation:
Molar mass is defined as the mass of 1 mole of an element. It is expressed in g/mol.
For the given elements:
Osmium is 76th element of the periodic table having mass of 190.23 u
Molar mass of osmium = 190.23 g/mol
Cesium is 55th element of the periodic table having mass of 132.9 u
Molar mass of cesium = 132.9 g/mol
Krypton is 36th element of the periodic table having mass of 83.8 u
Molar mass of krypton = 83.8 g/mol
Hence, the mass of osmium is 190.23 g/mol, cesium is 132.9 g/mol and that of krypton is 83.8 g/mol
silver tarnishes when it comes into contact with hydrogen sulfide in the air.
physical property or chemical property
Final answer:
Silver tarnishing is a chemical property, as it involves a reaction between silver and hydrogen sulfide in the air to form silver sulfide. This process alters the composition of the silver, differentiating it from physical properties.
Explanation:
The tarnishing of silver is a result of a chemical reaction between silver and hydrogen sulfide in the air. When silver tarnishes, it essentially reacts with hydrogen sulfide gas to form a compound called silver sulfide, which has a dark, streaky black appearance. The chemical equation for this reaction is 2 Ag(s) + H₂S(g) → Ag₂S(s) + H₂(g). This tarnish is not simply a surface dirt or residue that can be washed off, but a fundamental change in the surface layer of the silver object itself, which is why tarnishing is considered a chemical property.
The formation of silver sulfide (tarnish) indicates a change in the composition of the silver item, which differentiates this chemical property from physical properties that do not involve a change in chemical composition. Physical properties can include melting point, density, or color in a physical state, whereas chemical properties involve the substance's ability to undergo a specific chemical change. In this context, the tarnishing of silver aligns with other chemical properties such as the ability of iron to rust or for substances to burn, rot, explode, decompose, or ferment.
Is this equation balanced and in the lowest form? 4NH3 → 2N2 + 6H2 Yes, because there are equal amounts of atoms of each element on both sides. No, because the coefficients could be reduced to 2,1, and 3. Yes, because the coefficients are in their lowest whole number ratio. No, because the coefficients could be reduced to 2, 2, and 4.
Answer: The given equation is not balanced in its lowest form because the coefficients could be reduced to 2, 1 and 3.
Explanation: We are given a equation but it is not balanced in its lowest form, so to reduce it into its lowest form, we divide the whole equation by 2.
The equation becomes:
[tex]2NH_3\rightarrow N_2+3H_2[/tex]
The coefficients for the equation are 2, 1 and 3.
Chemical energy in burning wood is changed into thermal energy. The thermal energy is absorbed by water, which boils to produce steam. The thermal energy is changed into kinetic energy in the moving steam. The kinetic energy is used to turn a turbine, which converts the kinetic energy into electricity. Which sentence best describes this system?
Answer:
C. It involves both energy transformation and energy transfer.
A 50.0-mL sample of a 1.50 M NaOH solution is titrated with a 2.90 M HCl solution. What will be the final volume (sample + titrant) of solution when the NaOH has been completely neutralized by the HCl?
To neutralize a 50.0-mL sample of a 1.50 M NaOH solution with a 2.90 M HCl solution, you need 25.86 mL of HCl. Thus, the final volume of the solution when the NaOH has been completely neutralized by the HCl is 75.86 mL.
Explanation:First, you need to calculate the amount (moles) of NaOH in your original solution. To do this, multiply the volume of your solution (in liters) by the molarity. This yields (50.0 mL / 1000 mL/L) x 1.50 mol/L = 0.075 mol NaOH.
Next, use the balanced neutralization reaction between HCl and NaOH:
HCl (aq) + NaOH (aq) → H2O (l) + NaCl (aq)
From this reaction, we can see that one mole of HCl reacts with one mole of NaOH to produce one mole of water and one mole of sodium chloride.
Given that you have 0.075 moles of NaOH, you will need an equivalent amount of HCl for neutralization. Knowing the concentration of your HCl solution (2.9 M), calculate the volume of HCl required using the formula:
Volume = moles / molarity = 0.075 mol / 2.90 mol/L = 0.02586 L or 25.86 mL of HCl.
The final volume of the solution is ultimately the sum of the original NaOH solution volume and the volume of HCl titrant added: 50.0 mL + 25.86 mL = 75.86 mL.
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If a 30-ft3 volume of air at 10 psig is compressed to 25 ft3 at a constant temperature, what would be the new pressure in psig?
Final answer:
To find the new pressure in psig, we can use Boyle's Law, which states that the pressure and volume of a gas are inversely proportional at constant temperature. The new pressure would be 12 psig.
Explanation:
To determine the new pressure in psig, we can use Boyle's Law, which states that the pressure and volume of a gas are inversely proportional at constant temperature.
Boyle's Law can be represented by the equation: P1V1 = P2V2, where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume.
Using this equation, we can rewrite it as:
P1/P2 = V2/V1
Substituting the given values into the equation, we have:
10 psig/P2 = 25 ft3/30 ft3
Solving for P2, we find:
P2 = (10 psig)(30 ft3)/25 ft3 = 12 psig
What is the [H3O+]in a solution of pOH 0.253
Answer:
1.79*10^-14
Explanation:
A quick easy way I do is find the pH which is .253-14 = -13.747
and put it as the exponent for 10.
10^-13.747=1.79*10^-14
which of the following is an electric charge?
a. north
b. south
c. neutral
d. unassigned
what is scientific theory?
A theory that explains scientific observation.
scientific theories must be falsifiable
Which element is most likely to bend without breaking?
Answer:
cobalt (Co) is the correct answer.
Explanation:
The is most likely to bend without breaking element is cobalt because of the following properties.
Cobalt is a ferromagnetic metal.Cobalt is a brittle and hard element.cobalt is not a nonmetal, it is a metal and metals are malleable and ductile means they can bend without breaking.Hence Cobalt in their solid form they can be easily bent and changed into thin films without breaking
The repeating subunits that are responsible for the shape of a crystal are known as
unit cells.
heavy nuclei.
light electrons.
amorphous cells.
Answer:
The correct answer is unit cell.
Explanation:
Unit cell
Smallest unit of a crystal with fixed arrangement of atoms or ions. And this geometrical arrangement of atoms is responsible for shape of crystal and symmetry possessed by the crystal. Repetition of these unit cells in a space forms crystal.
The repeating subunits that are responsible for the shape of a crystal are
known as Unit cells.
What are Crystals?
These are solids whose components are arranged in a highly ordered
microscopic structure thereby forming lattice structure.
The unit cells known as atoms in a repeated manner are responsible for
the formation and shape of the crystal.
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