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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
An element is made up of different kinds of compounds.
D
A compound is made up of different kinds of atoms while an element is made up of the same kinds o
2) What forms when carbon (C) and oxygen (O) chemically combine?
A
a molecule
B
a compound
C
an atom
D
an element
3) Which of the following is an example of an element?
A
Iron (Fe)
B
Lead (Pb)
C
all of the above
D
Helium (He)
4) Why is carbon dioxide (CO2) classified as a compound?
A
the substances have mixed together
B
because it contains carbon
C
the elements are chemically bonded
D
It is not a compound
5) How many different elements are in the chemical formula in CH4?
A
0
B
2
C
6
D
4
6) Which of the following chemical symbols best represents an element?
A
CO2
B
HCl
C
NaCl
D
Fe
7) Which of the following is a chemical formula?
A
Li
B
Si
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
there is always a period
B
The first letter is always capitalized
C
All letters are always capitalized
D
There are always 2 letters
10) How many different elements are involved in the chemical equation - C2H5OH + O --> 2 CO+H2O
A
11
B
4
C
3
D
21
*select an answer for all questions
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