8th Grade Science 1st Semester Exam Review

Front

An example of a physical change is __________.

Back

Chopping wood is a physical change because it alters the form of the wood without changing its chemical composition.

Front

What type of property describes something that easily catches fire?

Back

Chemical property describes the ability of a substance to undergo a chemical change, such as combustion.

Front

The variable that is expected to change because of another variable is called __________.

Back

Dependent variable is the variable that is measured in an experiment and is affected by the independent variable.

Front

A statement that describes what scientists expect to happen every time under a particular set of conditions is a scientific __________.

Back

Law is a statement based on repeated experimental observations that describes an aspect of the world.

Front

What do we call the measurement of how much mass is contained in a given volume?

Back

Density is defined as mass per unit volume, often expressed in grams per cubic centimeter (g/cm³).

Front

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

Back

A physical change affects one or more physical properties of a substance without altering its chemical composition, while a chemical change results in the formation of new substances.

Front

What is an independent variable in an experiment?

Back

The independent variable is the factor that is changed or controlled in a scientific experiment to test its effects on the dependent variable.

Front

What is the scientific method?

Back

The scientific method is a systematic process for investigating phenomena, acquiring new knowledge, or correcting and integrating previous knowledge.

Front

What is the purpose of a control group in an experiment?

Back

A control group is used as a standard for comparison to determine the effect of the independent variable.

Front

What is the formula for calculating density?

Back

Density = Mass / Volume.