Master the 8th Grade STAAR Science Test Part 1/4

Front

What is a control in an experiment?

Back

A control is an aspect of the experiment that remains unchanged in order to measure the dependent variable.

Front

Which layer of Earth contains oceans and other bodies of water?

Back

The crust.

Front

What is evidence of a chemical change?

Back

Evidence of a chemical change includes formation of a gas, color change, and precipitate formation. A change in state of matter is NOT evidence of a chemical change.

Front

What is a property of sedimentary rock?

Back

Sedimentary rock can be made by mud, created under the ocean, and can contain organic material. It is NOT formed by melting rock.

Front

What indicates that a new substance has formed when two substances are mixed?

Back

A decrease in the temperature of the mixture indicates that a new substance has formed.

Front

What is the definition of a chemical change?

Back

A chemical change is a process where one or more substances are transformed into new substances with different properties.

Front

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

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

Front

What is the definition of sedimentary rock?

Back

Sedimentary rock is formed by the accumulation and compaction of mineral and organic particles.

Front

What is the role of the independent variable in an experiment?

Back

The independent variable is the factor that is changed or manipulated to observe its effect on the dependent variable.

Front

What is the definition of a hypothesis?

Back

A hypothesis is a testable prediction about the relationship between two or more variables.