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WorksheetsCounting Atoms
Total questions: 15
Worksheet time: 45mins
Name
Class
Date
1.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
2.
How many Magnesium are in 10MgCl2?
a)
10
b)
5
c)
20
3.
2H2 + O2 ----> 2H2O What is the product?
a)
------>
b)
2H2O
c)
2H2+ O2
4.
2H2 + O2 --------> 2H2O What are the reactants?
a)
----->
b)
2H2O
c)
2H2 +O2
5.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
6.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
2
c)
8
d)
24
7.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
8.
How many atoms are there TOTAL in:
H2SO4
H2SO4
a)
6
b)
5
c)
7
d)
3
9.
Number of N in (NH₄)₂CrO₄
a)
1
b)
2
c)
8
d)
16
10.
A subscript is the small number below a(n) ________ that tells the number of _______ of that element.
a)
element symbol; atoms
b)
atom; element symbol
c)
subscript; protons
d)
compound; elements
11.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
12.
Coefficients in chemical formulas...
a)
Multiply just the first atom
b)
Add to the subscripts at the end of the molecule
c)
Multiply elements without subscripts
d)
Multiply EVERYTHING!
13.
4CF2Cl2
a)
C = 4, F = 4, Cl = 2
b)
C = 1, F = 8, Cl = 8
c)
C = 4, F = 8, Cl = 8
d)
C = 1, F = 4, Cl = 8
14.
C3H5(NO3)3
a)
C = 3, H = 5, N = 3, O = 9
b)
C = 3, H = 5, N = 1, O = 9
c)
C = 9, H = 15, N = 3, O = 9
d)
C = 9, H = 15, N = 1, O = 3
15.
A ______ is a number written in front of a chemical formula.
a)
Coefficient
b)
Subscript
c)
Exponent
d)
Coordinator
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