1
Which of the following formations is a physical property of copper?
a. A deep blue solution when in contact with ammonia.
b. A new substance when combined with nitric acid.
c. A green copper carbonate compound when in contact with moist air.
d. A formation of a drill gauge and wire.
2
A 76­g sample of an unknown compound contains 12.9 g of sulfur. What is the percentage by mass of sulfur in the compound?
3
Which of the following substances is a mixture?
a. Baking soda
b. Gasoline
c. Salt
d. Sugar
4
An 8.00­g sample of aluminum reacts with oxygen to form 15.20 g of aluminum oxide. How many grams of oxygen are used in the reaction?
5
Matter that has a uniform and unchanging composition is known as a(n) ____.
6
Which of the following substances is an element?
a.
b.
c.
d.
7
According to the Law of Conservation of Mass, in any chemical change
a.
b.
c.
d.
8
Baking soda
Iron
Salt
Sugar
the mass of reactants is greater than the mass of products
the mass of reactants is less than the mass of products
the mass of reactants is equal to the mass of products
the masses of products and reactants have no predictable relationship
Which is a chemical property of copper?
a.
b.
c.
d.
has a boiling point of 2567° C
reacts in air to form a green layer
has the symbol Cu
is a solid at room temperature
1
9
Which is a compound?
a.
b.
c.
d.
sodium
sea water
carbon dioxide
brass
10 A 25.0­gram sample of magnesium oxide contains 10.8 grams of magnesium. What is the percent of oxygen by mass in this compound?
11 What is the separation technique that relies on the different boiling points of the parts of the mixture?
12 Which is the separation technique that identifies parts of a mixture based on how fast different compounds move across a material?
13 Which is NOT a chemical change?
a.
b.
c.
d.
a piece of wood is burned
an egg is cooked
a bar of iron rusts
ingredients for a cake are stirred together 14 Which is an intensive physical property?
a.
b.
c.
d.
color
mass
length
volume
15 Samples of gases containing nitrogen and oxygen were decomposed by electricity and the volume of each gas produced was measured. Based on these results, which is the correct chemical formula for Sample 2?
a.
b.
c.
d.
N2O3
NO
NO2
N2O
16 What is the state of matter that has an indefinite shape and indefinite volume?
17 Which is an extensive physical property?
a.
b.
c.
d.
color
length
density
boiling point
2
18 What is the state of matter that has a definite shape and definite volume?
19 What is the state of matter that has a indefinite shape and definite volume?
20 Which is an example of a homogeneous mixture?
a.
b.
c.
d.
sand
clean air
vegetable soup
fresh­squeezed orange juice
3