All of the following are properties of sodium. Which one is a physical property of sodium? (2 points)
a. It is surface turns black when first exposed to air.
b. It is a solid at 25°C and changes to a liquid when heated to 98°C.
c. When placed in water it sizzles and a gas is formed.
d. When placed in contact with chlorine it forms a compound that melts at 801°C.
# Which of the following is an example of a physical property? (2 points)
a. corrosiveness of sulfuric acid
b. lead becomes a liquid when heated to 601°C
c. flammability of gasoline
d. neutralization of stomach acid with an antacid
e. toxicity of cyanide
# Which one of the following represents a chemical change? (2 points)
a. heating water to form steam
b. sliced apples, in contact with air, turning brown
c. sugar dissolving in hot coffee
d. mixing sugar and cinnamon
e. cutting a bar of sodium metal into pieces with a knife
# Which one of the following represents a physical change? (2 points)
a. water, when heated, forms steam
b. bleach turns hair yellow
c. sugar, when heated, becomes brown
d. milk turns sour
e. apples, when exposed to air, turn brown
# Which one of the following represents a chemical change? (2 points)
a. boiling water to form steam
b. bleach turns hair yellow
c. melting butter
d. mixing powdered zinc and sulfur at room temperature
e. cutting a bar of sodium metal into pieces with a knife
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