8th Grade Science Winter Benchmark Review

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. Examples include melting, freezing, and dissolving.

Front

Which of the following is NOT a physical change?

Back

Wood burning is not a physical change; it is a chemical change.

Front

What is the Law of Conservation of Energy?

Back

The Law of Conservation of Energy states that energy cannot be created or destroyed, only transformed from one form to another.

Front

What type of energy is produced when Sheena rubs her hands together?

Back

Heat energy is produced when Sheena rubs her hands together, transforming stored chemical energy into mechanical energy.

Front

What are metalloids?

Back

Metalloids are elements that have properties of both metals and nonmetals, and they are found along the staircase line on the periodic table.

Front

What is a group in the periodic table?

Back

A group is a column in the periodic table where elements have similar chemical properties.

Front

What happens to elements as you move from left to right across a period in the periodic table?

Back

Elements change from metals to nonmetals as you move from left to right across a period.

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 with acid.

Front

What is an example of a chemical change?

Back

An example of a chemical change is rust forming on iron.

Front

What is kinetic energy?

Back

Kinetic energy is the energy of an object in motion.