9th Grade Physical Science Mid-Term

Front

What is the SI unit for length?

Back

The SI unit for length is the meter (m).

Front

Which sequence of atomic numbers represents elements that have similar chemical properties?

Back

The sequence 4, 20, 38, 88 represents elements with similar chemical properties.

Front

What is the correct formula for aluminum oxide?

Back

The correct formula for aluminum oxide is Al₂O₃.

Front

How do you convert grams to milligrams?

Back

To convert grams to milligrams, multiply by 1000. (1 g = 1000 mg)

Front

What was the control in our experimental design airplane model?

Back

The control was the single paper that was used.

Front

What is the definition of an atom?

Back

An atom is the smallest unit of an element, consisting of protons, neutrons, and electrons.

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 law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

Front

What is the formula for calculating density?

Back

Density is calculated using the formula: Density = Mass/Volume.

Front

What is the definition of a chemical reaction?

Back

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.