WorksheetsConcentration
Total questions: 20
Worksheet time: 45mins
Name
Class
Date
1.
Concentration is
a)
the amount of solute in the solvent
b)
the amount of solvent in the solute
c)
density
d)
particle size
2.
Which solution is more concentrated?
Solution 1:
500 mL of water
100 g of salt
Solution 2:
500 mL of water
90 g of salt
a)
Solution 1
b)
Solution 2
c)
They have the same concentration
d)
I have no idea
3.
In order to dilute a solution, you need to
a)
add more of the solid
b)
add more water
c)
find the mass
d)
find the volume
4.
Which answer best defines solute?
a)
a substance into which another substance dissolves
b)
a substance that dissolves in another substance
c)
to form a solution with another substance
d)
the ability of a substance to dissolve in another substance
5.
How many moles of solute are contained in 3.0 L of a 1.5 M solution?
a)
4.5 moles
b)
1.5 moles
c)
2.0 moles
d)
0.5 moles
6.
When a solution is very concentrated, it has a high amount of _________ to _________.
a)
solute to solvent
b)
solvent to solute
c)
solvent to solution
d)
solution to solute
7.
Which is an example of a solvent?
a)
Salt
b)
Egg whites
c)
Water
d)
Sugar
8.
You can make a solution more concentrated by adding __________.
a)
solute
b)
solvent
c)
water
9.
What is the molarity of 2.5 mol of NaOH in 12.0 L of solution?
a)
0.21 M
b)
30 M
c)
4.8 M
d)
20.8 M
10.
Molarity is measured in _____.
a)
moles per g.
b)
mols per L.
c)
moles per mm.
d)
moles per mL.
11.
How many moles of NaCl are present in a solution with a molarity of 8.59 M and a volume of 125 mL?
a)
1074 mol
b)
0.069 mol
c)
1.07 mol
d)
62.7 mol
12.
What is the molarity of 4 g of NaCl (MM=58.45) in 3,800 mL of solution?
a)
0.018 M
b)
0.0011 M
c)
1.052 M
d)
0.062 M
13.
How many moles are needed to make 2.5 L of a 3.8 M solution?
a)
9.5 mol
b)
0.66 mol
c)
1.5 mol
d)
15 mol
14.
What mass of solute is needed to make 75.0 g of a 3.4% solution?
a)
2.55 g
b)
22 g
c)
0.05 g
15.
How many grams of solute are dissolved in 125.0 mL of 5.00 M NaCl (MM = 58.45)?
a)
0.625 g NaCl
b)
625 g NaCl
c)
36.5 g NaCl
d)
0.04 mol NaCl
16.
What is the concentration, in percent by mass, of 0.62 g of solute in 45.0 g of solution?
a)
0.014 %
b)
1.4 %
c)
0.13%
17.
What mass of solute is needed to make 75.0 g of a 3.4% solution?
a)
2.55 g
b)
22 g
c)
0.05 g
18.
Molarity is
a)
moles per unit vol (cm3)
b)
moles per unit vol (dm3)
c)
moles per unit vol (m3)
d)
moles per unit vol (mm3)
19.
To prepare 1M of NaOH, you will need a mass of ______g NaOH
a)
23g
b)
40g
c)
4g
d)
39g
20.
0.25 dm3 contains 0.4 mol NaOH. Find its molarity.
a)
0.1M
b)
1.6M
c)
0.4M
d)
0.625M
100 %
