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Chem C ECA Review

Total questions: 20

Worksheet time: 2hrs 40mins

Name
Class
Date
1.
What will happen to the volume of a gas under constant temperature if the pressure increases?
a)
Increase
b)
Decrease
c)
Nothing
d)
Explosion!
2.

You have a gas that has a pressure of 2 atm and a volume of 10 L. What is the new volume if the pressure is changed to 1 atm?

a)

5 L

b)

20 L

c)

It would stay at 10L

d)

1 L

3.

If a gas is measured to have a volume of 0.5atm at 273K, what would happen to the pressure if the temp increased to 300K?

a)

increase

b)

decrease

c)

remain the same

4.
If the pressure exerted by a gas at 25 degrees C in a volume of 0.044 L is 3.81 atm, how many moles of gas are present?
a)
.002766 mole
b)
.0069 mol
c)
2.766 mol
d)
9.887 mol
5.

What is the volume of 1 mole of any gas at STP?

a)

2.24 L

b)

8.314 L

c)

22.4L

d)

It depends on the gas

6.

When trying to find the quantity of gas in a sample, you take a pressure measurement in units of atmospheres. What value of R should you use to complete the calculation?

a)

62.4

b)

8.314

c)

.0821

d)

22.4

7.

How many moles of nitrogen gas are there in 135 L of nitrogen at STP?

a)

6.03 mol N2

b)

.0446 mol N2

c)

22.4 mol N2

d)

3020 mol N2

8.

If 4.00 moles of a gas are at a pressure of 5.60 atm and a volume of 12.0 liters, what is the temperature?

a)

205 K

b)

.00489 K

c)

22.7 K

d)

2.02 K

9.

If I have 16.5 moles of gas at a temperature of 67 °C\degree C  and a volume of 88.89 liters, what is the pressure of the gas?

a)

1.02 atm

b)

5.18 atm

c)

525 atm

d)

104 atm

10.

The substance being dissolved is called the ________

a)

solvent

b)

solid

c)

solute

d)

solvate

11.

How many mols of HCl are in 3.0 L of 2.0M HCl solution?

a)

2.0 mol

b)

1.5 mol

c)

6.0 mol

d)

0.66 mol

12.
This solution would be considered
a)
Unsaturated
b)
Supersaturated
c)
Saturated
d)
Undefined
13.

You are given a small beaker of solution at room temp. You add a bit of solute to the solution and it dissolves. The solution was:

a)

saturated

b)

unsaturated

c)

concentrated

d)

warm

14.

What is the molarity of a 0.50 L of a solution that contains 60.0g of sodium hydroxide (NaOH)

a)

0.8 M

b)

1.5M

c)

3.0M

d)

6.0M

15.

Calculate the grams of NaOH present in 10.0 mL of a 2.0 M NaOH solution.

a)

0.80 grams

b)

2000 grams

c)

0.30grams

d)

5 grams

16.

A solution is made by dissolving 0.500mole of NaCl in enough water to give a final volume of 400.0 mL. What is the molarity of the solution?

a)

0.10 M

b)

0.40 M

c)

1.25 M

d)

2.33 M

17.

How many millilitres of 10.0 M NaOH is needed to make 300.0 ml of a 2.00 M solution?

a)

0.067 mL

b)

60.0 mL

c)

100 mL

d)

125 mL

18.

Calculate the volume of a 5M solution that contains 10 moles of NaOH

a)

0.5 L

b)

1 L

c)

2 L

d)

4 L

19.

The best piece of glassware to use when preparing a solution is a __________________.

a)

test tube

b)

beaker

c)

volumetric flask

d)

erlenmeyer flask

20.

In the lab, the ______________ of solute must be measured on the balance scale in order to prepare a solution with a specific molarity.

a)

grams

b)

volume

c)

liters

d)

molecules