CAST Science Practice Test

Front

What is a constant in an experiment?

Back

A constant is a factor that does not change during an experiment, allowing for a fair test of the independent variable.

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; it remains constant.

Front

What indicates a chemical reaction has occurred?

Back

A chemical reaction is indicated by the formation of new substances with different properties, such as color change, gas production, or the formation of a precipitate.

Front

What is an independent variable?

Back

An independent variable is the factor that is changed or manipulated in an experiment to observe its effects.

Front

What is a dependent variable?

Back

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

Front

What role do plants play in the water cycle?

Back

Plants help move water from the soil to the atmosphere through the process of transpiration.

Front

What is the greenhouse effect?

Back

The greenhouse effect is the warming of Earth's surface due to the trapping of heat by greenhouse gases in the atmosphere.

Front

What is a model in science?

Back

A model is a representation of an idea, object, or process that helps to explain and predict scientific phenomena.

Front

What is the significance of conducting multiple trials in an experiment?

Back

Conducting multiple trials increases the reliability of the results and helps to account for variability in data.

Front

What is a chemical property?

Back

A chemical property is a characteristic of a substance that can only be observed during a chemical reaction, such as reactivity or flammability.