1mol H_2O requires 44kJ heat
Moles of water
Given mass/Molar mass9/181/20.5molHeat required
0.5(44)22kJAs per the reaction given
Moles of H_2O=1
∆H=44kJMoles of water in 9g
Given mass/Molar mass9g/18g/mol0.5mol∆H
44(0.5)22KJIf you dissolve 1.78 g of MgSO4 (Mm = 120.4 g) in 1.10 L of water, what is the molarity of the solution? (Report your answer to four places past the decimal point)
The molarity of the solution given the data from the question is 0.0135 M
What is molarity?
Molarity is simply defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:
Molarity = mole / Volume
How to determine the mole of MgSO₄ Mass of MgSO₄ = 1.78 gMolar mass of MgSO₄ = 120.4 g/mol Mole of MgSO₄ =?Mole = mass / molar mass
Mole of MgSO₄ = 1.78 / 120.4
Mole of MgSO₄ = 0.0148 mole
How to determine the molarity Mole of MgSO₄ = 0.0148 mole Volume = 1.1 L Molarity =?Molarity = mole / Volume
Molarity = 0.0148 / 1.1
Molarity = 0.0135 M
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Which of the following is the conjugate base of H3PO4?
2-
OA. HPO4²-
3-
O B. PO4³-
O C. H₂PO4
O D. H₂PO4+
Answer:
H2 PO4 -1 is the correct answer
An acid and a base which differ from each other by a proton are said to form a conjugate pair. Here the conjugate base of H₃PO₄ is H₂PO₄⁻. The correct option is C.
What is a conjugate base?The entity produced when acid gives up a proton has a tendency to regain the proton and hence it behaves as a base. It is called the conjugate base of the parent acid. A base is a substance which acts as a proton acceptor.
Here the conjugate base of H₃PO₄ is formed when a proton is lost from it. So the lose of one proton forms the molecule H₂PO₄⁻ which is the conjugate base. An acid is a proton donor.
When a base accepts a proton it has a tendency to donate the proton and hence behaves as an acid. It is called the conjugate acid of the parent base.
Thus the correct option is C.
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A chemistry graduate student is studying the rate of this reaction:→2Cl2O5g+2Cl2g5O2gShe fills a reaction vessel with Cl2O5 and measures its
Rate = 1.321M/s[H₂CO₃]¹ ; k = 1.32M/s
So I’m in 6th grade and this is a chart. I need the # of molecules, # of atoms in each element and the total # of atoms 2H₂SO
Answer:
1.) 2 molecules
2.) 4 H atoms, 2 S atoms, 2 O atoms
3.) 8 total atoms
Explanation:
1.) 2 H₂SO
--------> The molecule is all of the elements bonded together (H₂SO). Because there is a coefficient of 2 in front of the molecule, this means that there are 2 molecules present.
2.) 2 H₂S₁O₁
---------> The number of atoms of each element is determined by the subscripts and the coefficients. In one molecule, there is one oxygen, one sulfur, and 2 hydrogen atoms (denoted by subscripts). Because there are two molecules, these values are doubled.
3.)
--------> The total number of atoms is calculated by adding the number of atoms of each element. If between 2 molecules there are 4 hydrogens, 2 sulfurs, and 2 oxygens, combined there would be a total of 8 atoms.
Which of these is a primary characteristic used to describe a clastic sedimentary rock?
A. Types of shells
B. Minerals present
C. Size of the rock
D. Grain size
The diagram shows the potential energy changes for a reaction pathway. (10 points)
A curved lined graph is shown. The y axis of the graph has the title Potential Energy. The x axis of the graph has the title Reaction Pathway. The graph curve begins at a higher level and ends at a slightly lower level. A vertical line labeled A, starting from the x axis till the beginning of the graph line is shown. A vertical line labeled B, starting from the x axis till the uppermost hump in the graph curve is shown. Another vertical line labeled C is shown from starting from the x axis till the point where the graph curve ends.
Part 1: Does the diagram illustrate an endothermic or an exothermic reaction? Give reasons in support of your answer.
Part 2: Describe how you can determine the total change in enthalpy and activation energy from the diagram and if each is positive or negative.
1) The diagram shows an exothermic reaction since the potential energy of the products is less than that of the reactants, meaning energy was released.
2) To find the change in enthalpy, determine the difference between the potential energy of the products and the potential energy of the reactants. (on this diagram, C-A) To find the activation energy, find the difference between the potential energy of the reactants and the "peak" of the curve (on this diagram, B-A). For this diagram, both the enthalpy and activation energy are positive.
Answer:
Part 1 and Part 2 Answer
Explanation:
Part 1:
The reactions have higher potential energy than the products, this means it is an exothermic reaction.
Part 2:
Change in enthalpy is determined by the difference between potential energy of the reactants (A) and potential energy of the products (C). Because the reactants is higher than the products' and we know the reaction is exothermic, the change in enthalpy will be negative (-∆H).
The activation energy can be determined by the difference between the peak of the graph (B) and the potential energy of reactants (A). The activation energy would be positive.
Which statement best describes the role of oxygen in cellular respiration?
OA. Oxygen molecules are a waste product of electron flow.
B. Oxygen molecules form as ATP molecules are made.
OC. Oxygen molecules form as sugar molecules are broken down.
OD. Oxygen molecules are used to make water molecules.
The role of oxygen in cellular respiration is to make water molecules. hence, option (D) is correct.
What is Cellular respiration ?
Cellular respiration is the process in which cells break down molecules for energy.
The cells use oxygen to break down food in the form of glucose to produce water and release carbon dioxide.
During aerobic cellular respiration, glucose reacts with oxygen, forming ATP that can be used by the cell. Carbon dioxide and water are created as byproducts.
In this reaction, energy is produced in the form of ATP that is used by the cell for its various activities.
Thus the correct answer is option D.
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100 POINTS! Final Honor Activity Question
An unbreakable meteorological balloon is released from the ground. Ground level pressure is 98.5 kPa and the temperature is 18oC. The balloon contains 74.0 dm3 of hydrogen gas. As the balloon ascends, the pressure drops to 7.0 kPa.
What is the new volume of the balloon, assuming no temperature change?
If a temperature drop of 80oC occurs, what is the new volume of the balloon?
Of the two factors, pressure and temperature, which had the greatest effect in changing the volume of the balloon? Support your answer with your calculations.
Approximately 160 km above the Earth the pressure of the atmosphere is about 3.00 x 10-4 Pa and the temperature is about -180oC. If 100 cm of a gas at STP is released at this distance from the Earth, what volume would it occupy?
The change in temperature had the greatest effect at changing the volume of the balloon.
What are the gas laws?The gas laws are used to describe the parameters that has to do with gases.
Given that;
P1 = 98.5 kPa
T1 = 18oC or 291 K
V1 = 74.0 dm3
P2 = 7.0 kPa
V2 = ?
T2 = 18oC or 291 K
P1V1/T1 = P2V2/T2
P1V1T2 =P2V2T1
V2= P1V1T2/P2T1
V2 = 98.5 kPa * 74.0 dm3 * 291 K/ 7.0 kPa * 291 K
V2 = 1041.3 dm3
When;
V1 = 1041.3 dm3
T1 = 291 K
V2 = ?
T2 = 80oC or 353 K
V1/T1 = V2/T2
V1T2 = V2T1
V2 = V1T2/T1
V2 = 1041.3 dm3 * 353 K/291 K
V2 = 1263 dm3
The change in temperature had the greatest effect at changing the volume of the balloon.
Given that
V1 = 100 cm^3
T1 = 273 K
P1 = 1.01 * 10^5 Pa
V2 = ?
P2 = 3.00 x 10^-4 Pa
T2 = -180oC or 255 K
V2= P1V1T2/P2T1
V2 = 1.01 * 10^5 Pa * 100 cm^3 * 255 K / 3.00 x 10^-4 Pa * 273 K
V2 = 3.14 * 10^10 cm^3
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Which substance will form a solution when mixed with solid sodium chloride?
OA. NaO₂ (s)
O B. Cl₂(g)
O C. CCl4(0)
OD. CH₂OH()
The substance that will form a solution when mixed with solid sodium chloride would be CH₂OH
Solubility of NaClA solution is only formed when a solute dissolves in a solvent.
In this case, [tex]CCl4_[/tex] and CH₂OH are the only liquid solvents. However, NaCl is insoluble in [tex]CCl_4[/tex] while it is soluble in CH₂OH due to its polarity.
Thus, NaCl can form a solution only with CH₂OH.
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The substance that will form a solution when mixed with solid sodium chloride would be CH₂OH.
What is the solution?A solution is only formed when a solute dissolves in a solvent.
In this case, CH₂OH are the only liquid solvents. However, NaCl is insoluble in while it is soluble in CH₂OH due to its polarity and Common-Ion Effect.
Thus, NaCl can form a solution only with CH₂OH.
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A 50.0 mL sample of gas at 20.0 atm of pressure is compressed to 40.0 atm of pressure at constant temperature. What is the new volume?
Answer:
20(50) = 40(V₂)
⇒1000 = 40V₂
⇒V₂ = 1000/40
⇒ V₂ = 25 mL
Explanation:
Answer:
25.0 mL
Explanation:
I took the test and got it right :)
A piece of copper has a mass of 290 g. How many atoms does the sample contain?
A piece of copper that has a mass of 290 g has 2.748 *10²⁴ molecules.
What is a mole ?A mole is a unit of measurement which relates the molar mass to the amount of the number of atoms and molecules .
1 mole = 6.022 *10²³ molecules or atoms
Molecular weight of copper = 63.55
290 g of Copper = 290/63.55 = 4.56 moles
1 mole has 6.022 *10²³ molecules or atoms
4.56 mole has 4.56 *6.022*10²³ molecules or atoms
= 2.748 *10²⁴ molecules.
A piece of copper that has a mass of 290 g has 2.748 *10²⁴ molecules.
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(b) Glycogen may be broken down to form glucose.
Fig.2.2 shows region X from the glycogen molecule in Fig. 2.1 in more detail.
Draw an annotated diagram in the space provided to explain how a glucose molecule is
formed from the free end of the glycogen molecule shown in Fig.2.2
Glycogen is formed by the loss of water molecules along the length of the polymer chain as the glucose molecules are joined together.
How is glycogen formed?Glycogen is formed by a process known as condensation polymerization. This involves the loss of -OH from one glucose molecule and the loss of H from another glucose molecule as the chain is formed.
Hence, glycogen is formed by the loss of water molecules along the length of the polymer chain as the glucose molecules are joined together.
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an imaginary gas phase reaction, according to the equation below is carried out in a closed container. 3.5 moles of A and 3.5 moles of B is introduced in the container. Reaction is carried out at 31.70C and volume of the container is 9.3 L. Percent yield of this reaction is 86.8%. Calculate the pressure of the container after reaction took place. R =0.0821 L.atm/mol.K
A+ 2B → AB2
bro hwnsbsjqjsnanqbsbjsjwhsshjs incorjssnsn
To what temperature must a balloon, initially at 9°C and 4.00 L, be heated in order to have a volume of 6.00 L?
The balloon must be heated to a temperature of 150 °C in order to have a volume of 6.00 L.
How are volume and temperature of gases related?The volume of a gas is directly proportional to the temperature of the gas.
According to Charles' law: V1/T1 / = V2/T2
V1 =4.0 L
T1 = 9°C = (273. + 9) K = 282 K
V2 = 6.0 L
T2 = ?
T2 = V2×T1/V1
T2 = 6 × 282 / 4 = 423 K
423.2 K = 423 -273 = 150 °C
Therefore, the balloon must be heated to a temperature of 150 °C in order to have a volume of 6.00 L.
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What is the density of an object if its mass is 10 g and a volume of 2 mL?
Hi there! Let's solve this problem shall we!
⠀Volume = 10g
Mass = 2 mL
In this specific problem, they are asking us to find the density of the object. So, using the information given to us (volume and mass), let's solve the problem!
Now, if you remember, D = M ÷ V
So, let's fill in the blanks!
D = Our unknown value
M = 2mL
V = 10g
Here is the filled out formula:
D = M ÷ V
D = 2mL ÷ 10g
D = 5 g/mL
*Make sure you put the units for your final solution!*
Which of the following happens during an endothermic chemical change? (5 points)
Group of answer choices
Heat is released.
Net energy decreases.
Products have a higher total potential energy than the reactants.
Products have the same total potential energy as the reactants..
Answer: Products have a higher total potential energy than the reactants.
Explanation:
During endothermic reactions, energy is absorbed, meaning that the products will have more potential energy.
Based on the following reaction, how much water is produced when oxygen react with 1 mole of C₂H8?
C₂H8 (g) + 40₂ (g) →2CO2 (g) + 4H₂O(g)
Answer:
4 moles
Explanation:
For every mole of deuteriomethane consumed, 4 moles of water are produced.
So, the answer is 4 moles.
Determine the number of valence electrons for sodium through the use of this table.
Na =
Answer:
Sodium has one valence electron. Valence electrons are electrons found in the outermost shell of an atom. The shell number representing the valence shell will differ depending on the atom in question. For sodium, which is in the 3rd row of the periodic table, the valence electrons will be found in the 3rd shell.
Which of the following best defines balanced forces?
A. Forces that act in opposite directions and cancel each other out
B. Unequal forces that do not cancel out and that cause a change in
motion
OC. The total force on an object after individual forces are added
together
D. Forces between two objects in physical contact
Answer:
Balanced forces are forces that act in opposite directions and cancel each other out
let me know if you have any other questions
Answer:
Discuss about Library Automation Life cycleExplanation:
Light refracts because:
000
it is reflected at a focal point.
it changes speed.
its frequency does not match the object it is striking.
All of the choices are correct.
Unit 1
Refraction is caused due to the change in speed of light when it enters from one medium to another. Hence, option B is correct.
What is refraction?Refraction happens when light changes direction, or bends when it moves from one material to another.
The cause of the refraction of light is that light travels at different speeds in different media.
This change in the speed of light when it moves from one medium to another causes it to bend.
Thus, refraction is caused due to the change in speed of light when it enters from one medium to another. Hence, option B is correct.
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What is the mass of butane gas, C4H10, that can be held in a 3.00 L container at STP?
Answer:
3/22.4
Explanation:
What is the balanced form of the chemical equation shown below? C12H22O11(I) + O2(g) -> H2O(I)
[tex]C_{12}H_{22}O_{11} + 12O_2[/tex] → [tex]12CO_2 + 11H_2O[/tex] is the balanced form of the chemical equation.
What is the balanced equation?A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge are the same for both the reactants and the products.
12 hydrogen, 35 oxygen, and 22 hydrogens are present on both sides of the reaction.
[tex]C_{12}H_{22}O_{11} + 12O_2[/tex] → [tex]12CO_2 + 11H_2O[/tex]
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How much volume (in cm^3)is gained by a person who gains 11.8 lb of our fat? Human fat has a density of 0.918 g/cm^3
The volume (in cm³) gained by a person who gains 11.8 lb of fat is 5830.49 cm³
What is density?The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as
Density = mass / volume
How to convert pounds to grams1 lb = 453.592 g
Therefore,
11.8 lb = 11.8 × 453.592
11.8 lb = 5352.3856 g
How to determine the volume Mass = 5352.3856 gDensity = 0.918 g/cm³Volume =?Volume = mass / density
Volume = 5352.3856 / 0.918
Volume = 5830.49 cm³
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law and the rate constant for the reaction.
PLEASE HELP!!!!.
A buffer solution was prepared by mixing 150.00 mL of 1.1341 mol/L of CH3COOH
and 100.00 mL of 0.831 mol/L of barium acetate. Determine the pH of the buffer
solution after the addition of 10.00 mL of 0.010 mol sulphuric acid. Kc for acetic acid
is 1.8 x 10-5
The pH of the buffer solution after the addition of sulfuric acid is determined as 4.43.
Initial moles of acid and base
The initial moles of acid and base conjugate is determined as follows;
n = CV
na₁ = (150 x 1.1341)/1000
na₁ = 0.17 mol
nb₁ = (100 x 0.831)/1000
nb₁ = 0.083 mol
Number of moles of the acid addedH₂SO4 ⇄ 2H²⁺ + SO₄²⁻
na₂ = (10 x 0.01)/1000
na₂ = 0.0001 mol
Final number of moles of the acid and basenb = 0.083 - 2(0.0001) = 0.0829 mol
na = 0.17 + 2(0.0001) = 0.1702 mol
pH of the buffer solution[tex]Ka = \frac{[CH_3COO][H^+]}{[CH_3COOH]} \\\\1.8\times 10^{-5} = \frac{0.0829(H^+)}{0.1702} \\\\H^+ = \frac{(1.8 \times 10^{-5})(0.1702)}{0.0829} \\\\H^+ = 3.696 \times 10^{-5}\\\\pH = -Log [H^+]\\\\pH = -Log (3.696 \times 10^{-5})\\\\pH = 4.43[/tex]
Thus, the pH of the buffer solution after the addition of sulfuric acid is determined as 4.43.
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In a laboratory investigation, a student separates
colored compounds obtained from a mixture of
crushed spinach leaves and water by using paper
chromatography. The colored compounds
separate because of differences in
(1) molecular polarity
malleability
(3) boiling point
(4) electrical conductivity
Answer:
Molecular polarity
Explanation:
tell me if im right
If you dissolve 25.0 g of NaNO3 (Mm = 85.0 g) in 155 mL of water, what is the molarity of the solution? (Report your answer to two places past the decimal point)
Answer:
1.90 M
Explanation:
To find the molarity of the solution, you need to use the molarity equation. This formula looks like this:
Molarity (M) = moles / volume (L)
To use this equation, you need to perform some conversions. You should (1) convert mL to L (by dividing by 1,000), then (2) convert grams NaNO₃ to moles (via molar mass), then (3) plug moles and volume into the molarity equation.
155 mL / 1,000 = 0.155 L
25.0 g NaNO₃ 1 mole
--------------------- x ----------------- = 0.294 moles NaNO₃
85.0 g
Molarity = moles / volume
Molarity = 0.294 moles / 0.155 L
Molarity = 1.8975....
Molarity = 1.90 M
Predict the products and write the balanced Equation for the following:
“Aqueous Copper (II)Chloride reacts with aqueous Tin (IV) Nitrite."
Answer:
2 CuCl₂ (aq) + Sn(NO₂)₄ (aq) ---> 2 Cu(NO₂)₂ (aq) + SnCl₄ (aq)
Explanation:
You can safely assume that this is a double-displacement reaction. In these reactions, the cation of one molecule is substituted for the cation of another molecule, and vice versa. Once the reaction occurs, you are left with the products:
copper (II) chloride + tin (IV) nitrite ---> copper (II) nitrite + tin (IV) chloride
The balanced equation is:
2 CuCl₂ (aq) + Sn(NO₂)₄ (aq) ---> 2 Cu(NO₂)₂ (aq) + SnCl₄ (aq)
Which of the following is not one of the four things that all organisms need to survive?
A. water
B. air
C. a source of energy
D. the ability to move
Answer:
b
Explanation:
this is because all organisims need water, c is out of the question because no energy is needed, d is out because it is needed for fighting against predators
A piece of unknown solid substance weighs 44.7 grams and requires 2110 J to increase its temperature from 23.2 C to 89.6 C. What is the specific heat of the substance?
Answer:
silicon 0.712 J/g°C
Explanation:
i hope this helps you, sorry if im wrong, but this should be correct!
Answer:
.7109 j / gm-C
Explanation:
Specific heat = j/gm-C
j = 2110 gm = 44.7 C = ( 89.6-23.2) = 66.4
2110 /(44.7 * 66.4) = .7109 j/gm-C
describe another way in which human activities that benefit society can also cause environmental risk.