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Unit 3 Review
Test Description: This test reviews elements and compounds for our end of course exam.
Instructions: Answer all questions to get your test result.
1) What is the primary difference between an element and a compound?
A
An element is made up of different kinds of atoms while a compound is made up of the same kinds o
B
None of the above
C
A compound is made up of different kinds of atoms while an element is made up of the same kinds o
D
An element is made up of different kinds of compounds.
2) What forms when carbon (C) and oxygen (O) chemically combine?
A
an element
B
a molecule
C
an atom
D
a compound
3) Which of the following is an example of an element?
A
Lead (Pb)
B
all of the above
C
Iron (Fe)
D
Helium (He)
4) Why is carbon dioxide (CO2) classified as a compound?
A
the elements are chemically bonded
B
It is not a compound
C
because it contains carbon
D
the substances have mixed together
5) How many different elements are in the chemical formula in CH4?
A
0
B
6
C
4
D
2
6) Which of the following chemical symbols best represents an element?
A
NaCl
B
CO2
C
HCl
D
Fe
7) Which of the following is a chemical formula?
A
Si
B
Li
C
Pb
D
NaCl
8) Which of the following is most abundant in the Earth’s crust?
A
silicon
B
oxygen
C
iron
D
aluminum
9) When writing a symbol for an element, which rule is important to remember?
A
All letters are always capitalized
B
there is always a period
C
There are always 2 letters
D
The first letter is always capitalized
10) How many different elements are involved in the chemical equation - C2H5OH + O --> 2 CO+H2O
A
11
B
3
C
4
D
21
*select an answer for all questions
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