Chemical Reactions

Front

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

Back

A physical change alters the form or appearance of a substance without changing its chemical composition, while a chemical change results in the formation of new substances with different chemical properties.

Front

What is an example of a chemical change?

Back

Examples of chemical changes include burning, rusting, and exploding.

Front

What is an example of a physical change?

Back

Examples of physical changes include melting, freezing, and dissolving.

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together.

Front

What are some signs that a chemical reaction has occurred?

Back

Signs of a chemical reaction include color change, temperature change, gas production, and the formation of a precipitate.

Front

Is the explosion of TNT a physical or chemical change?

Back

The explosion of TNT is a chemical change.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

Front

What is a reactant in a chemical reaction?

Back

A reactant is a substance that undergoes change during a chemical reaction.

Front

What is a product in a chemical reaction?

Back

A product is a substance that is formed as a result of a chemical reaction.

Front

What is an endothermic reaction?

Back

An endothermic reaction is a chemical reaction that absorbs heat from its surroundings.