Module 19 Review: Chemical Reactions Quiz

A change in which one or more substances are converted into a new substance is called a(n) (a)   reaction.

Answer explanation

A change in which one or more substances are converted into a new substance is called a chemical reaction. This process involves the breaking and forming of bonds, resulting in new chemical properties.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

If a precipitate, water, or a gas forms when two ionic compounds in solution are combined, the reaction is a(n) (a)   reaction.

Answer explanation

When two ionic compounds react and form a precipitate, water, or gas, it is classified as a double-displacement reaction. This occurs as the ions exchange partners, leading to the formation of new products.

A substance that prevents certain chemical reactions is a(n) (a)   .

Answer explanation

An inhibitor is a substance that slows down or prevents certain chemical reactions, making it the correct choice for the blank in the question.

When two or more substances combine in a chemical reaction to form another substance, a(n) (a)   reaction has taken place.

Answer explanation

When two or more substances combine in a chemical reaction, a synthesis reaction occurs. This type of reaction results in the formation of a new compound, making 'synthesis' the correct choice.

Tags

NGSS.MS-PS1-5

The breakdown of a substance into two or more simpler substances is a(n) (a)   reaction.

Answer explanation

The breakdown of a substance into two or more simpler substances is called a decomposition reaction. This type of reaction involves the separation of a compound into its individual elements or simpler compounds.

In a chemical equation, the substances that react are called (a)   .

Answer explanation

In a chemical equation, the substances that react are called reactants. They are the starting materials that undergo a chemical change to form products.

Tags

NGSS.MS-PS1-5

A substance that speeds up a chemical reaction without itself being permanently changed is a(n) (a)   .

Answer explanation

A catalyst is a substance that accelerates a chemical reaction without undergoing any permanent change itself. This definition directly matches the description in the question, making 'catalyst' the correct answer.

A reaction that requires energy in the form of heat is a(n) (a)   reaction.

Answer explanation

A reaction that requires energy in the form of heat is called an endothermic reaction. In these reactions, heat is absorbed from the surroundings, leading to a decrease in temperature.

Tags

NGSS.MS-PS3-4

NGSS.MS-PS1-4

When one element replaces another in a compound, a(n) (a)   reaction has occurred.

Answer explanation

When one element replaces another in a compound, it is known as a single-displacement reaction. This type of reaction involves an element taking the place of another in a compound, resulting in a new element and a new compound.

If the energy released in a chemical reaction is primarily in the form of heat, that reaction is a(n) (a)   reaction.

Answer explanation

If a chemical reaction releases energy mainly as heat, it is classified as an exothermic reaction. This is because 'exothermic' specifically refers to reactions that release heat to the surroundings.

Tags

NGSS.HS-PS1-4