NEW
Font size
S
M
L
XL
WorksheetsMixed Chemistry Calculations
Total questions: 28
Worksheet time: 3hrs 55mins
Name
Class
Date
1.
In chemistry, a "mole" is:
a)
The mass of an atom
b)
a large number used to count particles
c)
based on the volume of a substance
2.
The number 6.02 x 1023 is called...
a)
Obama's number
b)
Bohr's number
c)
Trump's number
d)
Avogadro's number
3.
We use the periodic table to calculate...
a)
mass
b)
molar mass
c)
moles
4.
What is the molar mass of C2H4O2?
a)
40g
b)
50g
c)
60g
d)
68g
5.
How do we get mass from moles?
a)
multiply by avogadro's number
b)
multiply by molar mass
c)
divide by avogadro's number
d)
divide by molar mass
6.
What would be the mass of 1.5mol H2O
a)
20
b)
27
c)
32
d)
40
7.
Which has more molecules?
a)
1 mole H2O
b)
1 mole Al(OH)3
c)
1 mole NaCl
d)
There are all the same
8.
What is the empirical formula of a substance with the molecular formula C2H4?
a)
C2H2
b)
C2H2
c)
C1H1
d)
CH2
9.
What is the empirical formula of a substance with the molecular formula NaCl?
a)
Na2Cl
b)
NaCl2
c)
NaCl
d)
Na2Cl2
10.
What is the empirical formula of this substance?
a)
C2H3
b)
CH3
c)
C2H6
d)
C2H2
11.
Which pair has the same empirical formula?
a)
NaCrO4 and Na2Cr2O7
b)
C2H4O2 and C6H12O6
c)
C3H6O3 and C2H6O2
d)
CH4 and C2H6
12.
Given the equation:
2NaClO3 (s) → 2NaCl (s) + 3O2 (g)
2.00 moles of NaClO3 will produce how many grams of O2? (mass of O2 = 32g/mol)
a)
56 g of O2
b)
96 g of O2
c)
64 g O2
d)
32 g O2
13.
KNO3 --> KNO2 + O2
What coefficients are needed to balance the reaction?
What coefficients are needed to balance the reaction?
a)
2, 2, 1
b)
2, 3, 2
c)
1, 2, 2
d)
1, 3, 1
14.
Using the following equation:
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from 6 moles H2?
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from 6 moles H2?
a)
4 moles Fe
b)
6 moles Fe
c)
9 moles Fe
d)
2 moles Fe
15.
2Na + 2H2O → 2NaOH+ H2
How many grams of hydrogen are produced if 120 g of Na are available?
How many grams of hydrogen are produced if 120 g of Na are available?
a)
5.27 g
b)
2.6 g
c)
690 g
d)
45 g
16.
2H2 + O2 −−〉 2H2O
How many grams of H2O can be produced from 3.91 g of O2?
How many grams of H2O can be produced from 3.91 g of O2?
a)
1.905
b)
4.4
c)
2.2
d)
1.1
17.
The ______________ yield is the maximum amount of product possible in a reaction. This determines the amount of product that should be produced in a perfect setting
a)
Percent
b)
actual
c)
stoichiometry
d)
theoretical
18.
When reacting Na with Cl2, we calculated that the theoretical yield should be 13 grams. Our actual yield was 12.5 grams. What is the percent yield?
a)
90.4%
b)
104%
c)
96.15%
d)
1.04%
19.
In a lab, a scientist calculate he should produce 12.3 grams of product in his experiment. When he is finished collecting his product it weighs 10.1 grams. What is his percent yield?
a)
82%
b)
0.82%
c)
10.1 %
d)
100%
20.
Balance this equation:
2Li + Cl2 -> LiCl
2Li + Cl2 -> LiCl
a)
2Li + Cl2 -> 4LiCl2
b)
2Li + Cl2 -> LiCl2
c)
2Li + Cl2 -> 2LiCl
21.
How many Hydrogen (H) atoms are in NH3O5
a)
3
b)
4
c)
5
d)
1
22.
Name the part in red:
H2 + O2 -> H2O
H2 + O2 -> H2O
a)
Coefficient
b)
Product
c)
Yield
d)
Subscript
23.
Name the part in red:
_2_H2 + _1_O2 -> _2_H2O
_2_H2 + _1_O2 -> _2_H2O
a)
Coefficient
b)
Product
c)
Yield
d)
Subscript
24.
Name the part in red:
H2 + O2 -> H2O
H2 + O2 -> H2O
a)
Coefficient
b)
Product
c)
Reactant
d)
Subscript
25.
How many phosphorus atoms are in PO4?
a)
1
b)
2
c)
3
d)
4
26.
Is the following equation balanced or unbalanced ?
Al + O2 --> Al2O3
Al + O2 --> Al2O3
a)
Balanced
b)
Unbalanced
27.
How many hydrogens are in 4H2O?
a)
6
b)
8
c)
2
d)
4
28.
What are the coefficient used to balance the equation below?
__Ag2O →__ Ag +___O2
__Ag2O →__ Ag +___O2
a)
2,4,1
b)
1,1,1
c)
2,1,2
d)
2,2,2
Reset
