SPE: Physical Science Semester 1 Exam

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 changes in state (like melting or boiling) and changes in shape or size.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and the rearrangement of atoms. Examples include rusting of iron and burning of wood.

Front

What is a heterogeneous mixture?

Back

A heterogeneous mixture is a mixture in which the components are not uniformly distributed and can be easily distinguished. Examples include salad and Italian salad dressing.

Front

What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture in which the components are uniformly distributed and cannot be easily distinguished. Examples include saltwater and air.

Front

What is a pure substance?

Back

A pure substance is a material that has a constant composition and consistent properties throughout. Examples include distilled water and pure gold.

Front

What is a compound?

Back

A compound is a substance formed when two or more elements are chemically bonded together in a fixed ratio. Examples include water (H2O) and carbon dioxide (CO2).

Front

Which element is the most reactive: iodine, silicon, silver, or argon?

Back

Iodine is the most reactive among the given elements.

Front

What two measurements make up density?

Back

Density is defined as mass per unit volume. Therefore, the two measurements that make up density are mass and volume.

Front

What is the formula for calculating density?

Back

The formula for calculating density is Density = Mass / Volume.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance that cannot be broken down into simpler substances, while a compound is a substance formed from two or more elements that are chemically bonded.