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WorksheetsFormulae of compounds
Total questions: 20
Worksheet time: 7mins
Name
Class
Date
1.
What is the formula for a magnesium ion?
a)
Mg+
b)
Mg2+
c)
Mg2-
d)
Mg-
2.
What is the name of this ion? SO42-
a)
sulfur tetroxide ion
b)
sulfonate
c)
sulfate
d)
sulfide
3.
What is the formula for lithium bromide?
a)
LiBr
b)
LiBr2
c)
Li2Br
d)
Li2Br2
4.
What is the formula for iron(II) oxide?
a)
FeO2
b)
FeO
c)
Fe2O
d)
Fe2O3
5.
K + and N-3
a)
KN
b)
KN3
c)
K3N3
d)
K3N
6.
The chemical formula for an ionic compound of potassium and oxygen is
a)
KO.
b)
K2O.
c)
K2O2.
d)
KO2.
7.
Which of the following represents an element?
a)
H2O
b)
H2
c)
NaCl
d)
CaCO3
8.
Which of the following an element?
a)
Carbonic Acid
b)
Copper
c)
Iron and Copper
d)
Water
9.
How many elements are represented in the compound?
Na2CO3
Na2CO3
a)
1
b)
2
c)
3
d)
4
10.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
11.
Which is the correct formula for:
three hydrogen (H)
one sulfur (S)
four oxygen (O)
three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
12.
The blue numbers in the image below represent ________
a)
I don't know, and don't want to try
b)
coefficients
c)
subscripts
d)
none of the answers are correct
13.
How many atoms are there TOTAL in:
H2SO4
H2SO4
a)
6
b)
5
c)
7
d)
3
14.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
15.
A compound ___.
a)
is a pure element
b)
has the same properties as its parts
c)
is a combination of two or more elements
d)
is composed of only metals
16.
Which is the correct model for 2H2O?
a)
b)
c)
d)
17.
True or False: elements AND compounds are pure substances.
a)
True
b)
False
18.
Which of the following lists all the elements that are present in a molecule of potassium carbonate, K2CO3 ?
a)
argon and oxygen
b)
phosphate and calcium
c)
potassium, carbon, and oxygen
d)
phosphorus, oxygen, and calcium
19.
The correct chemical formula for magnesium phosphide is
a)
MgP
b)
Mg₂P₃
c)
Mg₃P₂
d)
Mg₃(PO₄)₂
20.
Ca+2P-3
a)
PCa
b)
P2Ca3
c)
CaP
d)
Ca3P2
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