R.Thomas 8th Grade Unit #2 Practice

Front

What are physical properties?

Back

Physical properties are characteristics of a substance that can be observed or measured without changing the substance's identity. Examples include color, density, melting point, and electrical conductivity.

Front

What is the formula for density?

Back

The formula for density (D) is D = m/v, where m is mass and v is volume.

Front

How do you calculate the volume of an object using density?

Back

To calculate the volume of an object, rearrange the density formula: v = m/D, where m is mass and D is density.

Front

Why does a foam cube float in water while a metal cube sinks?

Back

The foam cube floats because it is less dense than the water, while the metal cube sinks because it is denser than the water.

Front

What is the relationship between mass and weight?

Back

Mass is the amount of matter in an object, while weight is the force exerted by gravity on that mass. Weight can change with gravity, but mass remains constant.

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What is thermal conductivity?

Back

Thermal conductivity is a measure of a material's ability to conduct heat. Materials with high thermal conductivity transfer heat quickly.

Front

What is the difference between physical changes and chemical changes?

Back

Physical changes affect the form of a substance but not its chemical composition (e.g., melting ice). Chemical changes result in the formation of new substances (e.g., rusting iron).

Front

What is the significance of melting point in physical properties?

Back

Melting point is the temperature at which a solid becomes a liquid. It is a key physical property used to identify substances.

Front

What is the definition of density?

Back

Density is defined as mass per unit volume of a substance, typically expressed in grams per cubic centimeter (g/cm³).

Front

How can substances be classified based on their physical properties?

Back

Substances can be classified based on properties such as density, melting point, boiling point, solubility, and electrical conductivity.