Question 1

The following is a decomposition reaction.
2KCl   → 2KCl + 3

Accepted Answer

A) True 
 B)False

Question 2

Barium chloride and sodium sulfate react according to the following equation.
BaCl2 + Na2SO4 → BaSO4 + 2NaCl 
Answer the following question(s)about this reaction.
-How many grams of sodium chloride can be produced from 50.grams of barium chloride?

Accepted Answer

A) 2.0 g 
B) 14 g 
C) 28 g 
D) 59 g 
E) 208 g 
A) 2.0 g 
B) 14 g 
C) 28 g 
D) 59 g 
E) 208 g

Question 3

What coefficient is placed in front of O2 to complete the balancing of the following equation? C5H8 + ? O2 → 5CO2+ 4H2O

Accepted Answer

A) 1 
B) 3 
C) 5 
D) 7 
E) 9 
A) 1 
B) 3 
C) 5 
D) 7 
E) 9

Question 4

How many moles of  K2SO4 are in 15.0 g of K2SO4 ?

Accepted Answer

A) 0.172 moles 
B) 2.61 × 103 moles 
C) 0.111 moles 
D) 0.0861 moles 
E) 0.119 moles 
A) 0.172 moles 
B) 2.61 × 103 moles 
C) 0.111 moles 
D) 0.0861 moles 
E) 0.119 moles

Question 5

For the following question(s),consider the following equation.
2Mg + OS1U1B12S1U1B0 → 2MgO
-How many grams of magnesium are needed to react with 16 g of  O2 ?

Accepted Answer

A) 0.50 g 
B) 1.0 g 
C) 12 g 
D) 24 g 
E) 48 g 
A) 0.50 g 
B) 1.0 g 
C) 12 g 
D) 24 g 
E) 48 g

Question 6

3.00 moles of NO2 have a mass of ________.

Accepted Answer

A) 138 g 
B) 46.0 g 
C) 30.0 g 
D) 90.0 g 
E) 45.0 g 
A) 138 g 
B) 46.0 g 
C) 30.0 g 
D) 90.0 g 
E) 45.0 g

Question 7

If the reaction shown below is exothermic,the energy level of the reactants is ________.   +   →   O

Accepted Answer

A) lower than that of the products 
B) higher than that of the products 
C) the same as that of the products 
D) possibly lower,possibly higher than that of the products 
E) higher than the activation energy of the reaction 
A) lower than that of the products 
B) higher than that of the products 
C) the same as that of the products 
D) possibly lower,possibly higher than that of the products 
E) higher than the activation energy of the reaction

Question 8

What is the mass,in grams,of 1.00 mole of argon gas?

Accepted Answer

The answer of What is the mass,in grams,of 1.00 mole...

Question 9

The molar mass of water is 18.02 g.

Accepted Answer

A) True 
 B)False

Question 10

In this reaction,what is the correct coefficient for hydrogen gas? ? H2 + ? O2 → ? H2O

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5 
A) 1 
B) 2 
C) 3 
D) 4 
E) 5

Question 11

How many grams of Fe2O3 are there in 0.500 mole of Fe2O3 ?

Accepted Answer

A) 79.9 g 
B) 35.9 g 
C) 63.8 g 
D) 51.9 g 
E) 160.g 
A) 79.9 g 
B) 35.9 g 
C) 63.8 g 
D) 51.9 g 
E) 160.g

Question 12

The ________ is the energy difference between reactants and products in a chemical reaction.

Accepted Answer

A) transition energy 
B) activation energy 
C) product energy 
D) overall energy 
E) heat of reaction 
A) transition energy 
B) activation energy 
C) product energy 
D) overall energy 
E) heat of reaction

Question 13

For the following question(s),consider the following balanced equation.  MgS1U1B13S1U1B0NS1U1B12S1U1B0+ 6HS1U1B12S1U1B0O → 3Mg(OH)S1U1B12S1U1B0 + 2NHS1U1B13S1U1B0 
-How many grams of   are produced when 125 g of   reacts as shown in the following balanced equation? 4   + 6NO → 5   + 6   O

Accepted Answer

A) 206 g 
B) 257 g 
C) 165 g 
D) 7.35 g 
E) 145 g 
A) 206 g 
B) 257 g 
C) 165 g 
D) 7.35 g 
E) 145 g

Question 14

For the following question(s),consider the following balanced equation.  MgS1U1B13S1U1B0NS1U1B12S1U1B0+ 6HS1U1B12S1U1B0O → 3Mg(OH)S1U1B12S1U1B0 + 2NHS1U1B13S1U1B0 
-Find the mass of AlCl3 that is produced when 25.0 grams of Al2O3 reacts with HCl according to the following equation. Al2O3 + 6HCl → 2AlCl3 + 3H2O

Accepted Answer

A) 155 g 
B) 72.9 g 
C) 65.3 g 
D) 32.6 g 
E) 16.3 g 
A) 155 g 
B) 72.9 g 
C) 65.3 g 
D) 32.6 g 
E) 16.3 g

Question 15

When the following equation is balanced,the coefficient of O2 is ________.
CH4 + O2 → CO2 + H2O

Accepted Answer

Question 16

For the following question(s),consider the following equation.
2Mg + OS1U1B12S1U1B0 → 2MgO
-The number of moles of MgO produced when 0.20 mole of O2 reacts completely is ________.

Accepted Answer

A) 0.10 mole 
B) 0.20 mole 
C) 0.40 mole 
D) 0.60 mole 
E) 0.80 mole 
A) 0.10 mole 
B) 0.20 mole 
C) 0.40 mole 
D) 0.60 mole 
E) 0.80 mole

Question 17

A chemical equation is balanced when ________.

Accepted Answer

A) the total number of molecules is the same in reactants and products 
B) the total number of ions is the same in reactants and products 
C) the sum of the coefficients of the reactants is equal to the sum of the coefficients of the products 
D) the number of atoms of each element is the same in reactants and products 
E) the charge on each atom is the same in reactants and products 
A) the total number of molecules is the same in reactants and products 
B) the total number of ions is the same in reactants and products 
C) the sum of the coefficients of the reactants is equal to the sum of the coefficients of the products 
D) the number of atoms of each element is the same in reactants and products 
E) the charge on each atom is the same in reactants and products

Question 18

What is the classification for this unbalanced reaction? Fe + HCl → FeCl3 + H2

Accepted Answer

A) combustion 
B) combination 
C) decomposition 
D) single replacement 
E) double replacement 
A) combustion 
B) combination 
C) decomposition 
D) single replacement 
E) double replacement

Question 19

In the following reaction,20.0 g of Al will react completely with 30.0 g of Br2.
2Al + 3   → 2

Accepted Answer

A) True 
 B)False

Question 20

How many moles of water, H2O,are present in 75.0 g  H2O?

Accepted Answer

A) 4.41 moles 
B) 4.16 moles 
C) 75.0 moles 
D) 7.50 moles 
E) 1.35 × 1023 moles 
A) 4.41 moles 
B) 4.16 moles 
C) 75.0 moles 
D) 7.50 moles 
E) 1.35 × 1023 moles

The following is a decomposition reaction. 2KCl → 2KCl + 3

Barium chloride and sodium sulfate react according to the following equation. BaCl2 + Na2SO4 → BaSO4 + 2NaCl Answer the following question(s)about this reaction. -How many grams of sodium chloride can be produced from 50.grams of barium chloride?

What coefficient is placed in front of O₂ to complete the balancing of the following equation? C₅H₈ + ? O2 → 5CO₂+ 4H₂O

How many moles of K₂SO₄ are in 15.0 g of K₂SO₄ ?

For the following question(s),consider the following equation. 2Mg + O₂ → 2MgO -How many grams of magnesium are needed to react with 16 g of O₂ ?

3.00 moles of NO₂ have a mass of ________.

If the reaction shown below is exothermic,the energy level of the reactants is ________. + → O

What is the mass,in grams,of 1.00 mole of argon gas?

The molar mass of water is 18.02 g.

In this reaction,what is the correct coefficient for hydrogen gas? ? H2 + ? O2 → ? H2O

How many grams of Fe₂O₃ are there in 0.500 mole of Fe₂O₃ ?

The ________ is the energy difference between reactants and products in a chemical reaction.

For the following question(s),consider the following balanced equation. Mg₃N₂+ 6H₂O → 3Mg(OH)₂ + 2NH₃ -How many grams of are produced when 125 g of reacts as shown in the following balanced equation? 4 + 6NO → 5 + 6 O

For the following question(s),consider the following balanced equation. Mg₃N₂+ 6H₂O → 3Mg(OH)₂ + 2NH₃ -Find the mass of AlCl₃ that is produced when 25.0 grams of Al₂O₃ reacts with HCl according to the following equation. Al₂O₃ + 6HCl → 2AlCl₃ + 3H₂O

When the following equation is balanced,the coefficient of O₂ is ________. CH4 + O2 → CO2 + H₂O

For the following question(s),consider the following equation. 2Mg + O₂ → 2MgO -The number of moles of MgO produced when 0.20 mole of O₂ reacts completely is ________.

A chemical equation is balanced when ________.

What is the classification for this unbalanced reaction? Fe + HCl → FeCl₃ + H₂

In the following reaction,20.0 g of Al will react completely with 30.0 g of Br2. 2Al + 3 → 2

How many moles of water, H₂O,are present in 75.0 g H₂O?

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Exam 7: Chemical Quantities and Reactions

The following is a decomposition reaction. 2KCl → 2KCl + 3

Barium chloride and sodium sulfate react according to the following equation. BaCl2 + Na2SO4 → BaSO4 + 2NaCl Answer the following question(s)about this reaction. -How many grams of sodium chloride can be produced from 50.grams of barium chloride?

What coefficient is placed in front of O2 to complete the balancing of the following equation? C5H8 + ? O2 → 5CO2+ 4H2O

How many moles of K2SO4 are in 15.0 g of K2SO4 ?

For the following question(s),consider the following equation. 2Mg + O2 → 2MgO -How many grams of magnesium are needed to react with 16 g of O2 ?

3.00 moles of NO2 have a mass of ________.

If the reaction shown below is exothermic,the energy level of the reactants is ________. + → O

What is the mass,in grams,of 1.00 mole of argon gas?

The molar mass of water is 18.02 g.

In this reaction,what is the correct coefficient for hydrogen gas? ? H2 + ? O2 → ? H2O

How many grams of Fe2O3 are there in 0.500 mole of Fe2O3 ?

The ________ is the energy difference between reactants and products in a chemical reaction.

For the following question(s),consider the following balanced equation. Mg3N2+ 6H2O → 3Mg(OH)2 + 2NH3 -How many grams of are produced when 125 g of reacts as shown in the following balanced equation? 4 + 6NO → 5 + 6 O

For the following question(s),consider the following balanced equation. Mg3N2+ 6H2O → 3Mg(OH)2 + 2NH3 -Find the mass of AlCl3 that is produced when 25.0 grams of Al2O3 reacts with HCl according to the following equation. Al2O3 + 6HCl → 2AlCl3 + 3H2O

When the following equation is balanced,the coefficient of O2 is ________. CH4 + O2 → CO2 + H2O

For the following question(s),consider the following equation. 2Mg + O2 → 2MgO -The number of moles of MgO produced when 0.20 mole of O2 reacts completely is ________.

A chemical equation is balanced when ________.

What is the classification for this unbalanced reaction? Fe + HCl → FeCl3 + H2

In the following reaction,20.0 g of Al will react completely with 30.0 g of Br2. 2Al + 3 → 2

How many moles of water, H2O,are present in 75.0 g H2O?

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Chemistry and Measurement

Matter and Energy

Atoms and Elements

Nuclear Chemistry

Ionic and Molecular Compounds

Gases

Solutions

Acids and Bases and Equilibrium

Introduction to Organic Chemistry: Hydrocarbons

Alcohols, thiols, ethers, aldehydes, and Ketones

Carbohydrates

Carboxylic Acids, esters, amines, and Amides

Lipids

Amino Acids, proteins, and Enzymes

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What coefficient is placed in front of O₂ to complete the balancing of the following equation? C₅H₈ + ? O2 → 5CO₂+ 4H₂O

How many moles of K₂SO₄ are in 15.0 g of K₂SO₄ ?

For the following question(s),consider the following equation. 2Mg + O₂ → 2MgO -How many grams of magnesium are needed to react with 16 g of O₂ ?

3.00 moles of NO₂ have a mass of ________.

How many grams of Fe₂O₃ are there in 0.500 mole of Fe₂O₃ ?

For the following question(s),consider the following balanced equation. Mg₃N₂+ 6H₂O → 3Mg(OH)₂ + 2NH₃ -How many grams of are produced when 125 g of reacts as shown in the following balanced equation? 4 + 6NO → 5 + 6 O

For the following question(s),consider the following balanced equation. Mg₃N₂+ 6H₂O → 3Mg(OH)₂ + 2NH₃ -Find the mass of AlCl₃ that is produced when 25.0 grams of Al₂O₃ reacts with HCl according to the following equation. Al₂O₃ + 6HCl → 2AlCl₃ + 3H₂O

When the following equation is balanced,the coefficient of O₂ is ________. CH4 + O2 → CO2 + H₂O

For the following question(s),consider the following equation. 2Mg + O₂ → 2MgO -The number of moles of MgO produced when 0.20 mole of O₂ reacts completely is ________.

What is the classification for this unbalanced reaction? Fe + HCl → FeCl₃ + H₂

How many moles of water, H₂O,are present in 75.0 g H₂O?