Honors Chemistry Unit #1 Review

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 melting, freezing, and blowing up a balloon.

Front

What is the volume of an object?

Back

Volume is the amount of space that an object occupies, typically measured in cubic centimeters (cm³) or liters (L).

Front

True or False: The density of a specific type of material never changes.

Back

True. The density of a specific material is a constant property that does not change regardless of the amount of the material.

Front

What is an example of a physical change?

Back

Ice melting is an example of a physical change.

Front

How do you calculate the mass of a substance from the number of molecules?

Back

To calculate the mass, use the formula: Mass = (Number of molecules / Avogadro's number) x Molar mass of the substance.

Front

What is the definition of density?

Back

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

Front

What is the formula for calculating density?

Back

Density = Mass / Volume.

Front

What is an example of a chemical change?

Back

Burning a candle is an example of a chemical change, as it results in the formation of new substances.

Front

What happens to the volume of a gas when it is compressed?

Back

When a gas is compressed, its volume decreases due to the reduction in space between the gas particles.

Front

What is the significance of Avogadro's number?

Back

Avogadro's number (6.022 x 10²³) is the number of atoms, molecules, or particles in one mole of a substance.