Flashcard Review - Changes and Molecules

Front

What is a chemical reaction?

Back

A process where substances (reactants) undergo a transformation to form new substances (products).

Front

Which of the following is an example of a chemical reaction? Rusting of iron, Melting of ice, Boiling of water, Breaking a glass?

Back

Rusting of iron is a chemical reaction.

Front

What are reactants in a chemical reaction?

Back

Reactants are the starting substances that undergo change during a chemical reaction.

Front

What are products in a chemical reaction?

Back

Products are the substances that are formed as a result of a chemical reaction.

Front

What happens to molecules during a chemical reaction?

Back

They are rearranged to form new substances.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed; it is conserved.

Front

What is an example of a physical change?

Back

Melting of ice is a physical change.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

Front

What is sodium chloride commonly known as?

Back

Sodium chloride is commonly known as table salt.

Front

What is the role of energy in a chemical reaction?

Back

Energy is required to break bonds in reactants and is released when new bonds form in products.