Define density.
Density is the mass of an object divided by its volume.
True or false: Density is measured in grams per cubic centimeter.
TRUE
Common units for density include g/cm³ and kg/m³.
Fill in the blank: Mass is measured in _______.
grams or kilograms
What is the formula for density?
Density = Mass / Volume
Define the particle model.
The particle model describes matter as being made up of tiny particles that are in constant motion.
True or false: In solids, particles are tightly packed.
TRUE
This arrangement allows solids to maintain a fixed shape.
Fill in the blank: In liquids, particles are _______ than in solids.
less tightly packed
What happens to particles during melting?
Particles gain energy and move apart, changing from solid to liquid.
Define evaporation.
Evaporation is the process where liquid turns into vapor at temperatures below boiling.
True or false: Gases have a definite shape.
FALSE
Gases take the shape of their container.
Fill in the blank: The boiling point of water is _______ degrees Celsius.
100
What is condensation?
Condensation is the process where vapor turns back into liquid.
Define sublimation.
Sublimation is the transition of a substance from solid to gas without becoming liquid.
True or false: All substances have the same density.
FALSE
Different materials have different densities.
Fill in the blank: Volume is measured in _______.
liters or cubic centimeters
What happens to density when temperature increases?
Density generally decreases as temperature increases due to expansion.
Define mass.
Mass is the amount of matter in an object, typically measured in grams.
True or false: Ice is less dense than liquid water.
TRUE
This is why ice floats on water.
Fill in the blank: Freezing is the process of a liquid becoming _______.
solid
What is the relationship between mass, density, and volume?
Mass equals density multiplied by volume.
