Exploring Matter: Changes and Properties

Front

What is an endothermic reaction?

Back

An endothermic reaction is a chemical reaction that absorbs heat from its surroundings, causing the reaction container to feel cold.

Front

What properties should be considered to identify a pure substance?

Back

To identify a pure substance, one should consider its chemical properties such as pH and flammability.

Front

What is an example of a physical change?

Back

Freezing water to form ice is an example of a physical change.

Front

Which of the following is not a chemical change?

Back

Chopping vegetables is not a chemical change; it is a physical change.

Front

What illustrates a chemical change?

Back

Burning wood to form ash and smoke illustrates a chemical change.

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.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances.

Front

What is the boiling point?

Back

The boiling point is the temperature at which a liquid turns into vapor.

Front

What is flammability?

Back

Flammability is the ability of a substance to catch fire and burn.

Front

What is pH?

Back

pH is a measure of how acidic or basic a solution is, on a scale of 0 to 14.