1. State Whether Each of the Following Sentences Describes a Chemical Property Or a Physical

Physical or Chemical? (Pages 6 & 9)

1. State whether each of the following sentences describes a chemical property or a physical property.

a. Solid potassium permanganate, KMnO4(s), exists at room temperature as purple crystals.

b. Gold can be hammered into thin sheets (it is malleable) and drawn into thin wires (it is ductile).

c. Sodium metal reacts with water to form dissolved sodium hydroxide, NaOH(aq),

and hydrogen gas H2(g).

d. Solid sodium chloride, NaCl(s), does not conduct electricity.

e. Magnesium, Mg(s), burns in air with a bright, white flame.

f. Ammonia, NH3(g), has a strong, distinct odour.

2. Classify each situation as either a physical change or a chemical change. Explain your reasoning.

a. A rose bush grows from a seed that you have planted and nourished.

b. A green coating forms on a copper statue when the statue is exposed to air.

c. Your sweat evaporates to help balance your body temperature.

d. Frost forms on the inside of a freezer.

e. Salt is added to clear chicken broth.

f. Your body breaks down the food you eat to provide energy for your body’s cells.

g. Juice crystals dissolve in water.

h. An ice-cream cone melts on a hot day. Qualitative or Quantitative?

1. Classify the following observations about the physical properties of diamond as qualitative or quantitative.

a. At room temperature, diamond is a clear, colourless, crystalline solid.

b. Diamond has no odour.

c. Diamond melts at 3800K.

d. Diamond has a density of 3.59g/cm3.

e. Diamond is neither malleable nor ductile.