WorksheetsChemical Formulas HMJ
Total questions: 10
Worksheet time: 43mins
Name
Class
Date
1.
How many elements are in H2O?
a)
1
b)
2
c)
3
d)
4
2.
How many atoms are there TOTAL in:
H2SO4
H2SO4
a)
6
b)
5
c)
7
d)
3
3.
The blue numbers in the image below are called ___________.
a)
compounds
b)
coefficients
c)
subscripts
d)
chemical formulas
4.
The red numbers in the image below represent ________
a)
subscripts
b)
coefficients
c)
chemical formulas
d)
compounds
5.
How many Sodium (Na) atoms are in 6NaCl?
a)
1
b)
12
c)
6
d)
0
6.
How many atoms are Oxygen atoms are in this formula 3C2H8O ?
a)
8
b)
33
c)
1
d)
3
7.
How many atoms of Nitrogen are in this formula (NH₄)₂CrO₄?
a)
1
b)
2
c)
8
d)
16
8.
Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe
a)
Yes
b)
No
9.
What does the Law of Conservation of Mass state?
a)
Matter cannot be gained or lost in a chemical reaction.
b)
Matter can only be lost in a chemical reaction.
c)
Matter can only be gained in a chemical reaction.
d)
Matter can be gained and lost in a chemical reaction.
10.
Which of the following is an unbalanced equation?
a)
CaCO3 --> CaO + CO3
b)
PbO2 + 2H2-->2Pb + H2O
c)
2Na+ 2H2O-->2NaOH + H2
d)
CS2 + 2O2 --> CO2 + 2SO2
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