Physical Science Chapter 1-3 Review

Front

Why does every sample of a given substance have the same properties?

Back

Because a substance has a fixed, uniform composition.

Front

What is an example of a safe laboratory procedure?

Back

Tying back long hair and loose clothing.

Front

What do scientific theories do?

Back

Scientific theories summarize patterns found in nature.

Front

How do mixtures differ from pure substances?

Back

Mixtures can be separated by physical means.

Front

What system of measurement do scientists use to communicate data?

Back

They all use SI (International System of Units).

Front

What is a pure substance?

Back

A material with a fixed composition and distinct properties.

Front

What is a mixture?

Back

A combination of two or more substances that retain their individual properties.

Front

What is the difference between a scientific theory and a scientific law?

Back

A scientific theory explains why phenomena occur, while a scientific law describes what happens.

Front

What is the importance of safety procedures in a laboratory?

Back

Safety procedures prevent accidents and ensure a safe working environment.

Front

What is the role of hypotheses in scientific research?

Back

Hypotheses are testable predictions that can be investigated through experiments.