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Analytical Chemistry Final Exam

Total questions: 65

Worksheet time: 1hrs 12mins

Name
Class
Date
1.
Which piece of equipment is shown in the picture?
a)
Graduated Cylinder
b)
Meter Stick
c)
Triple-Beam Balance
d)
Beaker
2.

What is the reading of the meniscus?

a)

36mL

b)

45mL

c)

35.0mL

d)

30.5mL

3.

What is the volume of the glue stick (in the picture)?

a)

15 mL

b)

23 mL

c)

8 mL

d)

7 mL

4.

The boiling point of chlorine is ‑34.6 °C. This temperature

expressed in kelvins is

a)

-30.3K

b)

177.4K

c)

238.6K

d)

243.0K

5.

How many significant figures should be displayed in the result of the operation, 8.5201 + 1.93?

a)

1

b)

2

c)

3

d)

4

6.
How many significant figures are in the measurement 40,500 mg?
a)
four
b)
five
c)
three
d)
two
7.
Which group of measurements  is the most precise? (Each group of measurements is for a  different object)
a)
2.0 g, 3.0 g, 4.0 g
b)
1 g, 3 g, 5 g
c)
2 g, 2.5 g, 3 g
d)
2 g, 3 g, 4 g
8.

What lab equipment is used to measure the amount of matter in an object?

a)

funnel

b)

balance

c)

graduated cylinder

d)

wire gauze

9.

A tool used in measuring 27 mL of liquid.

a)

Bunsen burner

b)

Thermometer

c)

Graduated cylinder

d)

Beaker

10.

A small cylindrical container that holds small amounts of liquid. What is this apparatus ?

(a)  

11.

used for accurately dispensing known volume of liquids

a)

burette

b)

graduated cylinder

c)

beaker

d)

test-tube

12.

Used to agitate liquids or mixture

a)

scoopula

b)

spatula

c)

stirring rod

d)

test-tube brush

13.

Used to pick up small objects

a)

Tong

b)

forceps

c)

test-tube holder

d)

spatula

14.

Coloured paper used to determine whether the solution is acidic, basic or neutral

a)

pH paper

b)

Fillter paper

c)

weighing paper

15.

Which of the following are good properties when choosing a precipitating reagent?

a)

easily filtered for contaminants

b)

reactive to constituents of the atmosphere

c)

composition is unknown after dried

d)

its solubility is high

16.

What is a types of Gravimetric analysis?

a)

Precipitate Gravimetry

b)

Volumetilization

c)

Titrimetric analysis

d)

Spectrometry

17.

These are tiny particles that show no tendency to settle from solution and are difficult to filter out.

a)

Colloid precipitate

b)

Crystalline precipitate

c)

Nucleation

d)

Analyte

18.

This is a major source of contamination:

a)

Absorption

b)

Adsorption

c)

Nucleation

d)

Recrystallization

19.

Which of the following are types of coprecipitation? Check all that applies.

a)

Surface adsorption

b)

Agglomeration

c)

Coalescent coagulation

d)

Mixed crystal formation

e)

Mechanical entrapment

20.

Filtration improves the purity of both colloidal and crystalline precipitates.

a)

TRUE

b)

FALSE

21.

What are the mechanisms of precipitate formation? Check all that applies.

a)

Nucleation

b)

Volatilization

c)

Particle growth

d)

Condensation

e)

Agglomeration

22.

What is the first step of gravimetric analysis?

a)

Precipitation

b)

Digestion

c)

Washing

d)

Ignition

e)

Filtration

23.

What is the molar mass of lithium carbonate (Li2CO3)?

Lithium = 6.941 u

Carbon = 12.011 u

Oxygen = 15.999 u

a)

73.89 g/mol

b)

105.99 g/mol

c)

138.21 g/mol

d)

100.09 g/mol

24.

What is the molar mass of calcium carbonate (CaCO3)?

Calcium = 40.078 u

Carbon = 12.011 u

Oxygen = 15.999 u

a)

73.89 g/mol

b)

100.09 g/mol

c)

105.99 g/mol

d)

138.21 g/mol

25.

What does the TARE button do?

a)

resets the reading to zero

b)

doubles the previous reading

c)

gives an average of the previous two readings

d)

makes the reading more accurate and precise

26.

Gravimetric analysis is used to determine the mass of an element or compound in a substance.

a)

TRUE

b)

FALSE

27.
The pH scale is a range from:
a)
1-7
b)
0-14
c)
1-5
d)
1-20
28.
A(n) ______ is a substance with a pH less than 7
a)
Acid
b)
Alkaline
c)
Base
d)
Buffer
29.
Complete the sentence.
A substance that is more basic has a _____ pH than a substance that is acidic.
a)
lower
b)
higher
c)
the same
d)
none of the above
30.

In a test of pH levels, a baking soda has a pH of 9 and bleach has a pH of 12. What is true about there relationship?

a)

Both of the solution are Bases

b)

Both of the solution are Acids

c)

The Baking soda is an acid and the Bleach is a base

d)

The baking soda is a base and the Bleach is an Acid.

31.

A base is a substance

a)

That releases OH- ions when dissolved in water

b)

That releases H+ ions when dissolved in water

c)

Does not release any ions when dissolved in water

d)

None of the above

32.
On the pH scale higher numbers indicate
a)
acids
b)
bases
33.

An acid

a)

is a substance that releases H+ ions when dissolved in water

b)

is a substance that does not release any ions when dissolved in water

c)

is a substance that releases OH- when dissolved in water

d)

releases an equal amount of OH- and H+ ions when dissolved in water

34.

Water has a neutral because

a)

it has more H+ ions than OH-

b)

it has more OH- ions than H+

c)

it does not produce any ions

d)

it has an equal amount of H+ and OH- in solution

35.

It is a process where the filtered solid is redissolved and reprecipitated.

(a)  

36.

This image shows what type of coprecipitation

(a)  

37.

What is the correct arrangement of the following:

I - digestion

II - calculation

III - precipitation

IV - drying

V - filtration

a)

V - I - IV - III - II

b)

I - II - IV - V - III

c)

III - I - V - IV - II

d)

IV - II - I - III - V

38.

Large particle precipitate is more suitable in gravimetric work.

a)

TRUE

b)

FALSE

39.

True of crystalline precipitate

a)

not formed easily

b)

affected by gravity

c)

can't be filtered easily

d)

none of the above

40.

Which is true about relative supersaturation?

a)

particle size is is inversely proportional to the supersaturation of the solution

b)

When Q-S/S is large, the precipitate tends to be crystalline solid

c)

particle size is is directly proportional to the supersaturation of the solution

d)

When Q-S/S is small, the precipitate tend to be colloidal

41.

Convert the temperature 102° F to the Celsius scale


a)

 38.89° C

b)

40 °C

c)

 38° C

d)

 41° C

42.

Convert 90° C and 65° C  to the Fahrenheit scale-

a)

174° F and 147° F

b)

192° F and 129° F

c)

194° F and 149° F

d)

164° F and 146° F

43.
a solute whose water solution conducts electricity is called a(n)
a)
nonconductor
b)
electrolyte
c)
nonelectrolyte
d)
aqueous solution
44.
The thing that does the dissolving
a)
Solute
b)
Solvent
c)
Colloid
d)
Solution
45.

What is the molarity of 4 g of NaCl in 3,800 mL of solution?

a)

0.018 M

b)

0.0011 M

c)

1.052 M

d)

0.062 M

46.
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
47.
What is a solution that has the maximum amount of solute dissolved at a specific temperature and pressure?
a)
Supersaturated
b)
Saturated
c)
Unsaturated
d)
Undefined
48.
What is the molarity of a solution that contains 0.202 mol KCl in 7.98 L of solution
a)
0.0132 M KCl
b)
0.0253 M KCl
c)
0.459 M KCl
d)
1.36 M KCl
49.

Size of the particles of colloidal solutions i between __________.

a)

(a) 10-7 and 10-5

b)

(b) 10-5 and 10-7

c)

(c) 11-10 and 1011

d)

(d) None

50.

Colloidal solutions are stable because _________.

a)

(a) The particles of the solution cannot be separated through filtration.

b)

(b) The particles of the solution do not settle down.

c)

(c) The particles of the solutions are to small.

d)

(d) All the above.

51.
What is it about the water molecule that makes it a great solvent?
a)
water demonstrates polarity; a partial charge on each side of the molecule
b)
due to its molecular formula
c)
it has a liner molecular shape
d)
due to it's non-polar molecular structure
52.
Attractions between water molecules are called
a)
Covalent bonds
b)
Ionic bonds
c)
Polar bonds
d)
Hydrogen bonds
53.

What is an intermolecular force?

a)

Forces around molecules

b)

Gravity

c)

Forces between molecules

d)

Forces within a molecule like a covalent or ionic bond

54.
Why does water move from the roots to the leaves of plants through the plants' tiny tubes?
a)
specific heat 
b)

capillary action

c)

atoms

d)
density
55.

Which one of the following diagrams has the lowest vapor pressure?

a)

1

b)

2

c)

3

d)

4

e)

5

56.
When the temperature of matter increases the particles...
a)
speed up and move closer
b)
speed up and move farther apart
c)
slow down and move closer together
d)
slow down and move farther apart
57.
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
58.

What is the equation of boiling point elevation when solute is non-electrolyte?

a)

△T = Kbm

b)

△T = iKbm

c)

△T = iKfm

d)

△T = Kfm

59.

The equation called Raoult's Law would look like this

a)

Posolvent = Xsolvent Psolvent

b)

Psolvent = Posolvent + Xsolvent

c)

Psolvent = Xsolvent Posolvent

d)

Posolvent = Xsolvent + Psolvent

60.
What is the Kc expression for this reaction?
   2 NO(g)  +  O2(g) ⇌  2 NO2(g)
a)
Kc = [NO2]2 / [NO]2 [O2]
b)
Kc =  [NO]2 [O2] / [NO2]2
c)
Kc = [NO]2 [O2] [NO2]2
d)
Kc = [NO2]2 / [NO]2 +  [O2]
61.
The following reaction :    
SO2 (g) +  NO2 (g) <=> SO3 (g) + NO (g)  
had reached a state of equilibrium, was found to contain  
0.40 mol L-1 SO3 , and 0.30 mol L-1 NO,
0.15 mol L-1NO2 , and 0.20 mol L-1 SO2.
Calculate the equilibrium constant  for this reaction. 
a)
4
b)
.42
c)
.25
d)
1
62.
Consider the following reaction. What would be the equilibrium constant expression?
4Br2(g) + CH4(g) ↔  4HBr(g) + CBr4(g)
a)
[Br2]4  [CH4]/ [HBr]4  [CBr4]
b)
[HBr]4 [CBr4]/ [Br2]4 [CH4]
c)
[HBr ]/ [Br2]4 [CH4]
d)
[HBr]4 [CBr4]/ [Br2]4 [CH]4
63.

At the start of a reaction, there are 0.490 mol N2, 5.861X10-2 mol H2, and 9.84X10-4 mol NH3 in a 6.00L reaction vessel at 386 °C. If the equilibrium constant (Kc) for the reaction

N2(g) + 3H2(g) ⇌ 2NH3 (g)

Is 1.2 at this temperature. Predict which way the net reaction will proceed.

a)

left to right

b)

right to left

c)

no movement

64.

Which of the following doesn't affect chemical equilbrium

a)

temperature

b)

volume

c)

mass

d)

concentration

65.

What is the pH of a solution that has a [H+] of 2.5 x 10-5?

4.605.02.57

a)

4.6

b)

5.0

c)

2.5

d)

7.0

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