Chemical Reactions

Front

What is a chemical reaction?

Back

A process where substances (reactants) are transformed into new substances (products) through the breaking and forming of chemical bonds.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed; the total mass of reactants equals the total mass of products.

Front

What is a molecule?

Back

A molecule is made of two or more atoms bonded together.

Front

What are reactants?

Back

Substances that undergo a chemical change in a reaction.

Front

What are products?

Back

Substances that are formed as a result of a chemical reaction.

Front

What is an example of a chemical change?

Back

Burning wood, which produces ash, smoke, and gases.

Front

What is an example of a physical change?

Back

Melting ice, which changes from solid to liquid but remains water.

Front

What is an indicator of a chemical reaction?

Back

Color change, gas production, temperature change, or odor change.

Front

What is an endothermic reaction?

Back

A reaction that absorbs heat from its surroundings.

Front

What is an exothermic reaction?

Back

A reaction that releases heat to its surroundings.