Chemical Reactions

Front

What is a chemical reaction?

Back

A process where substances (reactants) are transformed into new substances (products) with different properties.

Front

What are the signs that a chemical reaction has occurred?

Back

Color change, odor change, gas production, temperature change, and formation of a precipitate.

Front

What is a catalyst?

Back

A substance that increases the rate of a chemical reaction without being consumed in the process.

Front

What is a molecule?

Back

A group of two or more atoms bonded together, representing the smallest fundamental unit of a chemical compound.

Front

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

Back

A physical change does not create new substances, while a chemical change results in the formation of new substances.

Front

What is an example of a physical change?

Back

Melting ice, dissolving sugar in water, or breaking a glass.

Front

What is an example of a chemical change?

Back

Burning wood, rusting iron, or baking a cake.

Front

Who is a materials scientist?

Back

A scientist who studies and develops new materials by understanding chemical reactions and properties.

Front

What is the role of energy in chemical reactions?

Back

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

Front

What is an endothermic reaction?

Back

A reaction that absorbs energy from its surroundings, usually in the form of heat.