Properties of MatterProperties of Matter

Chemical Properties: the way a substance reacts with others to form new substances with different properties.

Example: Steel, rubber, & plastic

Chemical properties involve the Reactivity of elements or compounds

Chemical properties are related to the specific elements that make up the substances.◦Example: Carbon in charcoal will burn

= flammability (chemical property)

Physical PropertiesPhysical PropertiesRemain the same for a pure

substance

Can be observed or measured without a change in composition◦Color, shape, odor, etc.

Also include melting point, boiling point, strength, & magnetism.

DensityDensityDensity = The mass per unit

volume of a substance

Low Density = “Light”High Density = “Heavy”

Heavier items are more dense.

D = Mass Volume

You can determine if an item will float or sink if you know the density.

More dense = ________Less dense = ________

The units for density are grams per cubic centimeter◦g/cm3

Practice ProblemsPractice ProblemsMass = 9.17 gVolumes = 10.0 cm3

What is the density?

Practice ProblemsPractice Problems

What is the density of a piece of wood that has a mass of 25.0 grams and a volume of 29.4 cm3 ?

A  piece of wood that measures 3.0 cm by  6.0 cm by 4.0 cm has a mass of 80.0 grams. What is the density of the wood? Would the piece of wood float in water? 

A cup of gold colored metal beads was measured to have a mass 425 grams. By water displacement, the volume of the beads was calculated to be 48.0 cm3. Given the following densities, identify the metal.

Gold: 19.3 g/mLCopper: 8.86 g/mL

Bronze: 9.87 g/mL

BuoyancyBuoyancy

The force with which a more dense fluid pushes less dense substances upward.◦Example: Ice & Water