Question 1

If the relative mass of a pingpong ball is 1/20 that of a golf ball, how many golf balls would you need to equal the mass of 200 Ping-Pong balls?

Accepted Answer

A) 10 
B) 200 
C) 100 
D) 20 
E) 6.022 × 1023 
A) 10 
B) 200 
C) 100 
D) 20 
E) 6.022 × 1023

Question 2

Which of the above reactions would proceed the fastest?

Accepted Answer

A) a 
B) b 
C) c 
D) all proceed at same rate 
E) not enough information given 
A) a 
B) b 
C) c 
D) all proceed at same rate 
E) not enough information given

Question 3

What is the number of grams of CO2 produced if you combust 0.50 mole of CH4 according to the following balanced equation? CH4 + 2 O2 → CO2 + 2 H2O

Accepted Answer

A) 22 g 
B) 10 g 
C) 44 g 
D) 32 g 
E) 1 g 
A) 22 g 
B) 10 g 
C) 44 g 
D) 32 g 
E) 1 g

Question 4

Which is higher in an endothermic reaction: the potential energy of the reactants or the potential energy of the products?

Accepted Answer

A) The potential energy of the products is higher than the potential energy of the reactants. 
B) The potential energy of the reactants is higher than the potential energy of the products. 
C) The potential energy of the reactants is the same as the potential energy of the products. 
D) In the early stages of the reaction the potential energy of the reactants is higher. In the later stages, the potential energy of the products is higher. 
A) The potential energy of the products is higher than the potential energy of the reactants. 
B) The potential energy of the reactants is higher than the potential energy of the products. 
C) The potential energy of the reactants is the same as the potential energy of the products. 
D) In the early stages of the reaction the potential energy of the reactants is higher. In the later stages, the potential energy of the products is higher.

Question 5

For the following balanced reaction, which of the following is a solid? 2 Na(l) + Cl2(g) → 2 NaCl(s)

Accepted Answer

A) Na 
B) 2 Na 
C) Cl2 
D) Cl 
E) NaCl 
A) Na 
B) 2 Na 
C) Cl2 
D) Cl 
E) NaCl

Question 6

A 1.00 carat pure diamond has a mass of 0.20 grams. How many carbon atoms are there within this diamond?

Accepted Answer

A) 6.0 ×   carbon atoms 
B) 2.0 ×   carbon atoms 
C) 1.0 ×   carbon atoms 
D) 6.0 ×   carbon atoms 
A) 6.0 ×   carbon atoms 
B) 2.0 ×   carbon atoms 
C) 1.0 ×   carbon atoms 
D) 6.0 ×   carbon atoms

Question 7

According to the following balanced chemical equation, if you want to generate two moles of H2O how many grams of O2 do you need? 2 H2 + O2 → 2 H2O

Accepted Answer

A) 32 
B) 16 
C) 8 
D) 4 
E) 6.022 × 1023 
A) 32 
B) 16 
C) 8 
D) 4 
E) 6.022 × 1023

Question 8

What is the formula mass of a molecule of CO2?

Accepted Answer

A) 44 amu 
B) 56 amu 
C) 58.9 amu 
D) 118 amu 
E) none of the above 
A) 44 amu 
B) 56 amu 
C) 58.9 amu 
D) 118 amu 
E) none of the above

Question 9

If the relative mass of a hydrogen atom is 1/4 that of a helium atom, how many helium atoms would you need to equal the mass of 200 hydrogen atoms?

Accepted Answer

A) 50 
B) 200 
C) 800 
D) 4 
E) 100 
A) 50 
B) 200 
C) 800 
D) 4 
E) 100

Question 10

If it takes 200 golf balls to equal the mass of four bowling balls, what is the relative mass of bowling balls to golf balls?

Accepted Answer

A) 1/50 
B) 1/20 
C) 20 times 
D) 100 times 
E) 6.022 × 1023  
A) 1/50 
B) 1/20 
C) 20 times 
D) 100 times 
E) 6.022 × 1023

Question 11

Three identical candles are placed in the jars shown below and lit at the same time. Jar x is left open while jars y and z are sealed with lids. The candle in which jar goes out first?   x y z

Accepted Answer

A) The candle in jar x will go out first. 
B) The candle in jar y will go out first. 
C) The candle in jar z will go out first. 
D) All the candles go out at the same time. 
A) The candle in jar x will go out first. 
B) The candle in jar y will go out first. 
C) The candle in jar z will go out first. 
D) All the candles go out at the same time.

Question 12

For the above energy profiles, which reaction has the highest activation energy?

Accepted Answer

A) a 
B) b 
C) c 
D) d 
E) All have the same activation energy. 
A) a 
B) b 
C) c 
D) d 
E) All have the same activation energy.

Question 13

Which of the above reactions would proceed the slowest?

Accepted Answer

A) a 
B) b 
C) c 
D) all proceed at same rate 
E) not enough information given 
A) a 
B) b 
C) c 
D) all proceed at same rate 
E) not enough information given

Question 14

Many people hear about atmospheric ozone depletion and wonder why we don't simply replace that which has been destroyed. Knowing about CFCs and how catalysts work, explain how this would not be a lasting solution.

Accepted Answer

A) The amount of energy required to create and transport sufficient ozone to the stratosphere would would be cost prohibitive. 
B) Governments would be too slow to respond as they argued about who should shoulder the burden of undertaking such an endeavor. 
C) Any ozone we placed into the stratosphere would be destroyed by the same catalytic action that destroys naturally occurring stratospheric ozone. 
D) all of the above 
A) The amount of energy required to create and transport sufficient ozone to the stratosphere would would be cost prohibitive. 
B) Governments would be too slow to respond as they argued about who should shoulder the burden of undertaking such an endeavor. 
C) Any ozone we placed into the stratosphere would be destroyed by the same catalytic action that destroys naturally occurring stratospheric ozone. 
D) all of the above

Question 15

Given that the bond energy of N2 is 946 kJ/mole, the bond energy of O2 is 498 kJ/mole and the NO bond energy is 631 kJ/mole, how much energy is required to react 1 mole of nitrogen molecules according to the following reaction? N2 + O2 → 2 NO

Accepted Answer

A) 182 kJ 
B) -182 kJ 
C) 813 kJ 
D) -813 kJ 
E) 2075 kJ 
A) 182 kJ 
B) -182 kJ 
C) 813 kJ 
D) -813 kJ 
E) 2075 kJ

Question 16

In a chemical reaction, the bonds being formed are ________.

Accepted Answer

A) the same as the ones broken 
B) different from the ones broken 
C) more energetic than the ones broken 
D) less energetic than the ones broken 
A) the same as the ones broken 
B) different from the ones broken 
C) more energetic than the ones broken 
D) less energetic than the ones broken

Question 17

You are given two samples of elements, and each sample has a mass of 10 grams. If the number of atoms in each of these samples is the same, what must be true of the two elements?

Accepted Answer

A) The density of the two elements are the same. 
B) The elements are likely be located in the same position in the periodic table. 
C) Their spectral patterns will likely be identical. 
D) all of the above 
A) The density of the two elements are the same. 
B) The elements are likely be located in the same position in the periodic table. 
C) Their spectral patterns will likely be identical. 
D) all of the above

Question 18

For the following balanced equation, which has the highest coefficient? 4 H2 + 2 C → 2 CH4

Accepted Answer

A) H2 
B) C 
C) CH4 
D) H4 
E) none of the above 
A) H2 
B) C 
C) CH4 
D) H4 
E) none of the above

Question 19

What role does entropy play in chemical reactions?

Accepted Answer

A) The entropy determines how much product will actually be produced. 
B) The entropy change determines whether the reaction will be exothermic or endothermic. 
C) The entropy change determines whether the reaction will occur spontaneously or not. 
D) The entropy change determines whether or not the chemical reaction is favorable. 
A) The entropy determines how much product will actually be produced. 
B) The entropy change determines whether the reaction will be exothermic or endothermic. 
C) The entropy change determines whether the reaction will occur spontaneously or not. 
D) The entropy change determines whether or not the chemical reaction is favorable.

Question 20

For the above energy profiles, which reaction would proceed the slowest?

Accepted Answer

A) a 
B) b 
C) c 
D) d 
E) All have the same activation energy. 
A) a 
B) b 
C) c 
D) d 
E) All have the same activation energy.

If the relative mass of a pingpong ball is 1/20 that of a golf ball, how many golf balls would you need to equal the mass of 200 Ping-Pong balls?

Which of the above reactions would proceed the fastest?

What is the number of grams of CO₂ produced if you combust 0.50 mole of CH₄ according to the following balanced equation? CH₄ + 2 O₂ → CO₂ + 2 H₂O

Which is higher in an endothermic reaction: the potential energy of the reactants or the potential energy of the products?

For the following balanced reaction, which of the following is a solid? 2 Na_(l) + Cl_2(g) → 2 NaCl_(s)

A 1.00 carat pure diamond has a mass of 0.20 grams. How many carbon atoms are there within this diamond?

According to the following balanced chemical equation, if you want to generate two moles of H₂O how many grams of O₂ do you need? 2 H₂ + O₂ → 2 H₂O

What is the formula mass of a molecule of CO₂?

If the relative mass of a hydrogen atom is 1/4 that of a helium atom, how many helium atoms would you need to equal the mass of 200 hydrogen atoms?

If it takes 200 golf balls to equal the mass of four bowling balls, what is the relative mass of bowling balls to golf balls?

Three identical candles are placed in the jars shown below and lit at the same time. Jar x is left open while jars y and z are sealed with lids. The candle in which jar goes out first? x y z

For the above energy profiles, which reaction has the highest activation energy?

Which of the above reactions would proceed the slowest?

Many people hear about atmospheric ozone depletion and wonder why we don't simply replace that which has been destroyed. Knowing about CFCs and how catalysts work, explain how this would not be a lasting solution.

Given that the bond energy of N₂ is 946 kJ/mole, the bond energy of O₂ is 498 kJ/mole and the NO bond energy is 631 kJ/mole, how much energy is required to react 1 mole of nitrogen molecules according to the following reaction? N₂ + O₂ → 2 NO

In a chemical reaction, the bonds being formed are ________.

You are given two samples of elements, and each sample has a mass of 10 grams. If the number of atoms in each of these samples is the same, what must be true of the two elements?

For the following balanced equation, which has the highest coefficient? 4 H₂ + 2 C → 2 CH₄

What role does entropy play in chemical reactions?

For the above energy profiles, which reaction would proceed the slowest?

About Science

Particles of Matter

Elements of Chemistry

Subatomic Particles

The Atomic Nucleus

How Atoms Bond

How Molecules Mix

How Water Behaves

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Oxidations and Reductions Charge the World

Organic Compounds

Nutrients of Life

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Exam 9: How Chemicals React

If the relative mass of a pingpong ball is 1/20 that of a golf ball, how many golf balls would you need to equal the mass of 200 Ping-Pong balls?

Which of the above reactions would proceed the fastest?

What is the number of grams of CO2 produced if you combust 0.50 mole of CH4 according to the following balanced equation? CH4 + 2 O2 → CO2 + 2 H2O

Which is higher in an endothermic reaction: the potential energy of the reactants or the potential energy of the products?

For the following balanced reaction, which of the following is a solid? 2 Na(l) + Cl2(g) → 2 NaCl(s)

A 1.00 carat pure diamond has a mass of 0.20 grams. How many carbon atoms are there within this diamond?

According to the following balanced chemical equation, if you want to generate two moles of H2O how many grams of O2 do you need? 2 H2 + O2 → 2 H2O

What is the formula mass of a molecule of CO2?

If the relative mass of a hydrogen atom is 1/4 that of a helium atom, how many helium atoms would you need to equal the mass of 200 hydrogen atoms?

If it takes 200 golf balls to equal the mass of four bowling balls, what is the relative mass of bowling balls to golf balls?

Three identical candles are placed in the jars shown below and lit at the same time. Jar x is left open while jars y and z are sealed with lids. The candle in which jar goes out first? x y z

For the above energy profiles, which reaction has the highest activation energy?

Which of the above reactions would proceed the slowest?

Many people hear about atmospheric ozone depletion and wonder why we don't simply replace that which has been destroyed. Knowing about CFCs and how catalysts work, explain how this would not be a lasting solution.

Given that the bond energy of N2 is 946 kJ/mole, the bond energy of O2 is 498 kJ/mole and the NO bond energy is 631 kJ/mole, how much energy is required to react 1 mole of nitrogen molecules according to the following reaction? N2 + O2 → 2 NO

In a chemical reaction, the bonds being formed are ________.

You are given two samples of elements, and each sample has a mass of 10 grams. If the number of atoms in each of these samples is the same, what must be true of the two elements?

For the following balanced equation, which has the highest coefficient? 4 H2 + 2 C → 2 CH4

What role does entropy play in chemical reactions?

For the above energy profiles, which reaction would proceed the slowest?

About Science

Particles of Matter

Elements of Chemistry

Subatomic Particles

The Atomic Nucleus

How Atoms Bond

How Molecules Mix

How Water Behaves

Acids and Bases in Our Environment

Oxidations and Reductions Charge the World

Organic Compounds

Nutrients of Life

Medicinal Chemistry

Optimizing Food Production

Protection Water and Air Resources

Capturing Energy

Filters

What is the number of grams of CO₂ produced if you combust 0.50 mole of CH₄ according to the following balanced equation? CH₄ + 2 O₂ → CO₂ + 2 H₂O

For the following balanced reaction, which of the following is a solid? 2 Na_(l) + Cl_2(g) → 2 NaCl_(s)

According to the following balanced chemical equation, if you want to generate two moles of H₂O how many grams of O₂ do you need? 2 H₂ + O₂ → 2 H₂O

What is the formula mass of a molecule of CO₂?

Given that the bond energy of N₂ is 946 kJ/mole, the bond energy of O₂ is 498 kJ/mole and the NO bond energy is 631 kJ/mole, how much energy is required to react 1 mole of nitrogen molecules according to the following reaction? N₂ + O₂ → 2 NO

For the following balanced equation, which has the highest coefficient? 4 H₂ + 2 C → 2 CH₄