Unit 4 Flashcard 1 (Changing Matter)

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, involving a rearrangement of atoms.

Front

What happens to particles when temperature increases?

Back

When temperature increases, the particles move faster.

Front

Is change in color always a sign of a chemical change?

Back

No, change in color can indicate either a physical or chemical change, depending on the context.

Front

What is an example of a physical change?

Back

Chewing food is an example of a physical change.

Front

How can data be organized to interpret the results of an experiment effectively?

Back

Data can be organized in a table showing the relationship between variables, such as temperature and reaction time.

Front

What is the significance of observing gas production during a reaction?

Back

The production of gas during a reaction often indicates a chemical change is occurring.

Front

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

Back

A physical change does not alter the chemical composition of a substance, while a chemical change results in new substances being formed.

Front

What are some indicators of a chemical change?

Back

Indicators of a chemical change include color change, gas production, temperature change, and the formation of a precipitate.

Front

What is the role of temperature in chemical reactions?

Back

Temperature can affect the rate of chemical reactions; generally, higher temperatures increase reaction rates.