WorksheetsUnit 2 Chemistry
Total questions: 26
Worksheet time: 52mins
Name
Class
Date
1.
Which of the following represents an element?
a)
hydrogen
b)
water
c)
carbon dioxide
d)
salt
2.
Two liquids are combined in a beaker. Which of the following does not identify the formation of a new substance?
a)
a gas is produced
b)
the temperature changes
c)
1 liquid dissolved into the other hand
d)
a solid precipitate is formed
3.
The methane molecule shown above contains
a)
five elements
b)
two elements
c)
two compounds
d)
one atom
4.
To explain the difference between elements and compounds, a teacher filled clear boxes with spheres. Which box best represents a sample of an element?
a)
Box A
b)
Box B
c)
Box C
d)
Box D
5.
What are the major components of Earth's atmosphere?
a)
carbon dioxide (CO2), silicon dioxide (SiO2), and water (H2O)
b)
nitrogen (N2) and oxygen (O2)
c)
water (H2O) and sodium chloride (NaCl)
d)
silicon dioxide (SiO2) and calcium carbonate (CaCO3)
6.
Which of the following is a characteristic of an element?
a)
They break down when reacting with acids
b)
They are always metals
c)
They can be altered with an electric current
d)
They are considered a pure substance
7.
Which of the diagram(s) illustrate a compound?
a)
2 and 3
b)
4 and 5
c)
1, 4, and 5
d)
None of these
8.
An experiment was conducted by placing pieces of identical chalk into test tubes A and B. Water was added to test tube A and an equal volume of vinegar was added to test tube B. The student recorded his observation with these drawings.
Which test tube exhibits evidence of the formation of a new substance?
Which test tube exhibits evidence of the formation of a new substance?
a)
test tube A because the chalk absorbed water
b)
test tube A because the chalk dissolved
c)
test tube B because of the production of a gas
d)
test tube B because the chalk melted
9.
During a science class experiment, a teacher placed a small amount of sodium metal into 25 mL of water. Which of the following would be the best evidence that a chemical change has taken place?
a)
the sodium stays on the surface of the water
b)
a gas is given off
c)
the sodium appears smaller
d)
the liquid remains colorless
10.
One of the minerals that makes up the igneous rock Olivine is Fayalite. The formula for Fayalite is Fe2SiO4. How many elements does Fayalite contain?
a)
3
b)
4
c)
6
d)
7
11.
Which of the following is a pure substance?
a)
CO2
b)
O2
c)
H2O
d)
NH4
12.
Which of the following is a physical property?
a)
luster
b)
flammability
c)
density
d)
chemical composition
13.
A semi-conductor is another name for a(n)
a)
nonmetal
b)
metal
c)
metalloid
d)
element
14.
A change in state: from a solid to a liquid, or liquid to a gas is a chemical change.
a)
True
b)
False
15.
How many atoms of sulfur (S) are in H2SO4?
a)
1
b)
2
c)
3
d)
4
16.
An atom is a:
a)
basic particle from which all elements are made
b)
Group of 2 or more atoms bonded together
c)
group of 2 or more different atoms bonded together
d)
group of 2 or more substances that are together in the same place, but not bonded together
17.
Which of the following is a physical change?
a)
food digesting
b)
candle wax melting
c)
a tree dying
d)
a nail rusting
18.
A white powder is combined with a clear liquid. Which of the following would let you know that a chemical reaction occurred?
a)
the mixture turned white in color
b)
a gas was produced
c)
it took up more space in the container
d)
the powder disappears into the liquid
19.
A precipitate is when:
a)
a solid and a liquid are mixed together
b)
2 liquids are mixed and a solid is formed
c)
2 substances are mixed and heat is given off
d)
2 substances mix and a gas is produced
20.
What is true of metals, nonmetals, and metalloids?
a)
They have luster
b)
They are necessary for life
c)
They are ductile
d)
They can conduct electricity
21.
Which of the following is NOT a property of a metal?
a)
Ductibility
b)
Malleability
c)
Conductivity
d)
Low Density
22.
A pure substance is:
a)
A. a basic particle from which all elements are made
b)
B. 2 or more of the same atoms bonded
c)
C. 2 or more different atoms bonded together
d)
D. Both A & B
23.
Which of the following is a compound?
a)
A
b)
B
c)
C
24.
Which of the following is an example of a chemical change?
a)
adding red food coloring to water
b)
mixing M&M and Skittles together
c)
adding a red liquid to a white powder and it heating up
d)
tearing a piece of paper in half
25.
The definition of luster is:
a)
ability to transmit heat/electricity
b)
ability to be shaped
c)
ability to reflect light
d)
ability to be drawn into a thin wire
26.
Which of the following is an element?
a)
A
b)
B
c)
C
d)
D
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