Quiz about Physical Science Chapter 7 Review

Question 1

What type of change is burning classified as?

Accepted Answer

Chemical change

Answer

Biological change

Answer

Mechanical change

Answer

Physical change

Question 2

What occurs when a substance undergoes a chemical change?

Accepted Answer

A chemical reaction takes place

Answer

It becomes a gas

Answer

It remains the same

Answer

It turns into a liquid

Question 3

What does the law of conservation of mass state?

Accepted Answer

Mass is neither created nor destroyed in a chemical reaction.

Answer

Mass is created and destroyed in a chemical reaction.

Answer

Mass is only destroyed in a chemical reaction.

Answer

Mass is only created in a chemical reaction.

Question 4

What are the substances called that undergo change in a chemical reaction?

Accepted Answer

Reactants

Answer

Enzymes

Answer

Catalysts

Answer

Products

Question 5

What are the new substances formed as a result of a chemical reaction called?

Accepted Answer

Products

Answer

Reactants

Answer

Catalysts

Answer

Enzymes

Question 6

What does a chemical equation represent?

Accepted Answer

A representation of a chemical reaction

Answer

A physical change in matter

Answer

A mathematical formula

Answer

A biological process

Question 7

What does the law of conservation of mass state about chemical reactions?

Accepted Answer

The mass of the products is equal to the mass of the reactants.

Answer

The mass of the products is less than the mass of the reactants.

Answer

The mass of the products is unrelated to the mass of the reactants.

Answer

The mass of the products is greater than the mass of the reactants.

Question 8

When charcoal burns, what is the relationship between the mass of carbon dioxide produced and the mass of the charcoal and oxygen that reacted?

Accepted Answer

The mass of carbon dioxide is equal to the mass of charcoal and oxygen.

Answer

The mass of carbon dioxide is greater than the mass of charcoal and oxygen.

Answer

The mass of carbon dioxide is less than the mass of charcoal and oxygen.

Answer

The mass of carbon dioxide is unrelated to the mass of charcoal and oxygen.

Question 9

What remains constant in the chemical equation for burning carbon, regardless of the number of carbon atoms?

Accepted Answer

The equation used to describe the reaction

Answer

The number of carbon atoms

Answer

The amount of oxygen used

Answer

The temperature of the reaction

Question 10

What is the product formed when carbon reacts with oxygen?

Accepted Answer

Carbon dioxide (CO2)

Answer

Carbon monoxide (CO)

Answer

Methane (CH4)

Answer

Water (H2O)

Question 11

In the reaction of carbon with oxygen, what are the reactants?

Accepted Answer

Carbon and oxygen

Answer

Carbon dioxide and water

Answer

Oxygen and water

Answer

Carbon dioxide and methane

Question 12

What is the product formed when carbon reacts with oxygen?

Accepted Answer

Carbon dioxide (CO2)

Answer

Carbon monoxide (CO)

Answer

Water (H2O)

Answer

Oxygen (O2)

Question 13

In the reaction of burning carbon, what are the reactants?

Accepted Answer

Carbon and oxygen

Answer

Carbon dioxide and carbon

Answer

Carbon dioxide and water

Answer

Oxygen and water

Question 14

Why must chemical equations be balanced?

Accepted Answer

To show that mass is conserved during a reaction.

Answer

To change the products of the reaction.

Answer

To make the equation look neat.

Answer

To increase the speed of the reaction.

Question 15

What is the purpose of changing the coefficients in a chemical equation?

Accepted Answer

To balance the equation by adjusting the number of molecules

Answer

To alter the temperature of the reaction

Answer

To change the chemical identity of the reactants

Answer

To modify the physical state of the products

Question 16

What happens when you change a coefficient in a chemical equation?

Accepted Answer

The amount of the reactant or product changes

Answer

The reaction speed increases

Answer

The equation becomes unbalanced

Answer

The chemical formula of the reactant changes

Question 17

What is the purpose of changing the coefficients in a chemical equation?

Accepted Answer

To balance the equation by adjusting the number of molecules

Answer

To alter the temperature of the reaction

Answer

To change the state of matter of the products

Answer

To change the chemical identity of the reactants

Question 18

What is the product formed when hydrogen gas reacts with oxygen gas in an unbalanced chemical equation?

Accepted Answer

H2O

Answer

H2O2

Answer

H2

Answer

O2

Question 19

In the unbalanced chemical equation for the reaction between hydrogen and oxygen, how many oxygen atoms are present in the product?

Accepted Answer

1

Answer

2

Answer

4

Answer

3

Question 20

How many hydrogen atoms are present in the reactants of the unbalanced chemical equation for the reaction between hydrogen and oxygen?

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 21

What is the main difference between an unbalanced and a balanced chemical equation for the reaction of hydrogen and oxygen to form water?

Accepted Answer

The balanced equation has equal numbers of each type of atom on both sides.

Answer

The number of hydrogen atoms is the same in both.

Answer

The unbalanced equation has more water molecules.

Answer

The balanced equation has more oxygen atoms.

Question 22

In the balanced chemical equation for the formation of water, how many hydrogen molecules are used?

Accepted Answer

2

Answer

3

Answer

1

Answer

4

Question 23

How many oxygen atoms are present in the reactants of the unbalanced chemical equation for the formation of water?

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 24

How many hydrogen atoms are on each side of the balanced equation for water formation?

Accepted Answer

Two

Answer

Four

Answer

Eight

Answer

Six

Question 25

According to the balanced equation, how many molecules of hydrogen react with one molecule of oxygen to yield water?

Accepted Answer

Two

Answer

One

Answer

Four

Answer

Three

Question 26

What are the starting substances in a chemical reaction called?

Accepted Answer

Reactants

Answer

Products

Answer

Catalysts

Answer

Enzymes

Question 27

What are the substances formed in a chemical reaction called?

Accepted Answer

Products

Answer

Reactants

Answer

Catalysts

Answer

Enzymes

Question 28

What do reactants change into during a chemical reaction?

Accepted Answer

Products

Answer

Elements

Answer

Compounds

Answer

Mixtures

Question 29

What is true about the mass of products and reactants?

Accepted Answer

The mass of the products is equal to the mass of the reactants

Answer

The mass of the products is greater than the mass of the reactants

Answer

The mass of the products is less than the mass of the reactants

Answer

The mass of the products is double the mass of the reactants.

Question 30

Why is a chemical equation balanced?

Accepted Answer

To show that mass is conserved during a reaction

Answer

To show that energy is conserved during a reaction

Answer

To show that volume is conserved during a reaction

Answer

To show that temperature is conserved during a reaction.

Question 31

How is a chemical equation balanced?

Accepted Answer

By adjusting the number of molecules

Answer

By changing the reactants

Answer

By changing the products

Answer

By adjusting the temperature.

Question 32

What is a synthesis reaction?

Accepted Answer

A reaction in which two or more substances react to form a single substance.

Answer

A reaction where energy is absorbed from the surroundings.

Answer

A reaction where a single substance breaks down into two or more substances.

Answer

A reaction that involves the exchange of ions between two compounds.

Question 33

In a synthesis reaction, what can the reactants be?

Accepted Answer

Either elements or compounds

Answer

Only compounds

Answer

Only elements

Answer

Only gases

Question 34

What is always true about the product in a synthesis reaction?

Accepted Answer

It is always a compound.

Answer

It is always a gas.

Answer

It is always an element.

Answer

It is always a liquid.

Question 35

What is a decomposition reaction?

Accepted Answer

A reaction where a compound breaks down into two or more simpler substances.

Answer

A reaction where two elements combine to form a compound.

Answer

A reaction where a compound is formed from simpler substances.

Answer

A reaction where energy is absorbed.

Question 36

In a decomposition reaction, what must the reactant be?

Accepted Answer

A compound

Answer

A solution

Answer

A mixture

Answer

An element

Question 37

What can the products of a decomposition reaction be?

Accepted Answer

Elements or compounds

Answer

Only elements

Answer

Only compounds

Answer

Only mixtures

Question 38

What is a single-replacement reaction?

Accepted Answer

A reaction where one element takes the place of another element in a compound.

Answer

A reaction where two compounds exchange elements.

Answer

A reaction where two elements combine to form a compound.

Answer

A reaction where a compound breaks down into two or more elements.

Question 39

What causes the hydrogen gas to ignite explosively in the reaction between potassium and water?

Accepted Answer

The heat produced by the reaction

Answer

The pressure of the container

Answer

The presence of oxygen

Answer

The presence of a catalyst

Question 40

What is a double-replacement reaction?

Accepted Answer

A reaction where two compounds exchange positive ions and form two new compounds.

Answer

A reaction where a single compound breaks down into two or more elements.

Answer

A reaction where two elements combine to form a single compound.

Answer

A reaction where an element replaces another in a compound.

Physical Science Chapter 7 Review

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