Exemplar 4 Review

Front

What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances with different properties.

Front

What are indicators of a chemical change?

Back

Indicators include temperature change, formation of a precipitate, production of light, and gas production.

Front

Which of the following is NOT an indication of a chemical change?

Back

Shape change is NOT an indication of a chemical change.

Front

What happens to a glow stick in hot water compared to one in cold water?

Back

The glow stick in hot water will glow brighter and faster than the one in cold water.

Front

What is a dependent variable?

Back

A dependent variable is the variable that is measured in an experiment, which changes in response to the independent variable.

Front

What is a controlled variable?

Back

A controlled variable is a factor that is kept constant throughout an experiment to ensure that the results are valid.

Front

What is an independent variable?

Back

An independent variable is the factor that is changed or manipulated in an experiment.

Front

What does thermal energy refer to in a chemical reaction?

Back

Thermal energy refers to the heat energy released or absorbed during a chemical reaction.

Front

What is the outcome variable in an experiment?

Back

The outcome variable, also known as the dependent variable, is the result that is measured to see the effect of the independent variable.

Front

What does it mean if a chemical reaction has NOT occurred?

Back

It means that no new substances have formed, and the original substances remain unchanged.