Chemical Reactions Flashcard

Front

What is a chemical change?

Back

A process where substances combine or break apart to form new substances with different properties.

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What are indicators of a chemical reaction?

Back

Change in temperature, change in color, formation of a precipitate, release of a gas, release of light, change in odor.

Front

What is a precipitate?

Back

A solid that forms and settles out of a liquid mixture during a chemical reaction.

Front

What happens during a chemical reaction?

Back

Atoms rearrange to form new substances, breaking and forming chemical bonds.

Front

What is the law of conservation of mass?

Back

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

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 endothermic reaction?

Back

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

Front

What is an exothermic reaction?

Back

A reaction that releases energy to its surroundings, usually in the form of heat or light.