Chemical Processes and Equations Review

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Example: Coconut oil crystallizing in the freezer.

Front

What happens to the brightness of a glow stick when the temperature is lowered?

Back

Lowering the temperature makes the glow stick appear dimmer (not as bright).

Front

What happens to the brightness of a glow stick when the temperature is raised?

Back

Raising the temperature makes the glow stick appear brighter.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. Example: Cooking a steak.

Front

Why does the mass of a mixture change after a chemical reaction?

Back

The mass can decrease if a gas forms and escapes, especially if the reaction occurs in an open container.

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 an example of a physical change?

Back

Chopping wood is an example of a physical change.

Front

What is an example of a chemical change?

Back

Rust forming on iron is an example of a chemical change.

Front

What is the effect of temperature on chemical reactions?

Back

Increasing temperature generally increases the rate of chemical reactions.

Front

What is an endothermic reaction?

Back

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