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ECHEM30 LAB FINAL EXAM

Total questions: 35

Worksheet time: 36mins

Name
Class
Date
1.

These laboratory apparatus are very important when performing experiments of any kind. They can keep dangerous chemicals and other substances from damaging your eyes.

a)

Goggles

b)

Gloves

c)

Jacket

d)

Sunglasses

2.

These laboratory apparatus are important to wear in order to protect the skin from chemical substances.

a)

Goggles

b)

Gloves

c)

Jacket

d)

Sunglasses

3.

This laboratory apparatus is made up of a glass or plastic tube used for holding, mixing and heating small quantities of liquid chemicals.

a)

Erlenmeyer Flask

b)

Beaker

c)

Test tube

d)

Graduated Cylinder

4.

This laboratory apparatus has a conical shaped body, a cylindrically shaped neck, and a flat bottom.

a)

Erlenmeyer Flask

b)

Beaker

c)

Test tube

d)

Graduated Cylinder

5.

This laboratory apparatus is generally used for a more accurate way to measure volume than a typical beaker or flask.

a)

Erlenmeyer Flask

b)

Beaker

c)

Test tube

d)

Graduated Cylinder

6.

This laboratory apparatus is a metal tube that produces a flame from gas such as methane, propane, or butane.

a)

Bunsen Burner

b)

Funnel

c)

Tripod

d)

Wire gauze

7.

This laboratory apparatus is a pipe with wide mouth that helps to pour substances into a container without spilling.

a)

Bunsen Burner

b)

Funnel

c)

Tripod

d)

Wire gauze

8.

This laboratory apparatus is used to support a beaker or flask when heating. It helps to spread the heat evenly.

a)

Bunsen Burner

b)

Funnel

c)

Tripod

d)

Wire gauze

9.

This laboratory apparatus is used to support a beaker or flask when heating or when not in use.

a)

Bunsen Burner

b)

Funnel

c)

Tripod

d)

Wire Gauze

10.

This laboratory apparatus is a glass container with a flat bottom and a small spout for pouring.

It is used in the chemistry lab for mixing, heating, and stirring liquids

a)

Erlenmeyer Flask

b)

Beaker

c)

Test tube

d)

Graduated Cylinder

11.

The SI units J/g°C measures

a)

Specific heat

b)

mass

c)

temperature

d)

heat energy

12.
A pot of 2400g of water at a temperature of 25˚C is heated on a stove until the water boils (100˚C).  The specific heat of water is 4.18 J/(g˚C).
Determine the heat energy needed to heat the water in the pot to boiling.
a)
133.76J
b)
43,062.2J
c)
752,400J
d)
1,003,200J
13.
What  is the formula to calculate heat energy required to raise the temperature of any substance?
a)
Q=mc∆t
b)
Q=mc
c)
Q= ½mv
d)
m=QC
14.
What unit do you use to measure Thermal Energy?
a)
J/Kg ºC
b)
Kg
c)
ºC
d)
J
15.
What is the name of the positive electrode?
a)
cathode
b)
anode
16.
What is the name of the negative electrode?
a)
cathode
b)
anode
17.
What is electrolysis?
a)
breaking down of a compound using a current
b)
making a compound using a current
18.

The diagram shows the electrolysis of lead(II) bromide using inert electrodes. Why does the bulb only light up when the lead(II) bromide is melted?

a)

Bromine atoms in lead(II) bromide are converted to ions when it is melted

b)

Electrons flow through the lead(II) bromide when it is melted

c)

The ions in lead(II) bromide are mobile charge carriers in the molten state.

d)

There are no ions in solid lead(II) bromide

19.

Anions get discharged by ________ electrons at the ___________

a)

gaining, cathode

b)

losing, anode

c)

gaining, anode

d)

losing, cathode

20.

What is the gas produced at the anode during the electrolysis of very dilute hydrochloric acid?

a)

water

b)

oxygen

c)

hydrogen

d)

chlorine

21.

What ions are present in molten aluminium oxide?

a)

Al3+, O2-, H+, OH-

b)

Al3+, O2-

c)

Al3+, OH-

22.

What is the basis for separating the components of a mixture through distillation?

a)

freezing point of the substances

b)

room temperature

c)

decaying period

d)

boiling pint of the substances

23.

Which of the following techniques is used to separate the components of a solution?

a)

filtration

b)

decantation

c)

evaporation

d)

physical manipulation

24.

Which technique is shown in the image?

a)

seiving

b)

filtration

c)

decanting

d)

crystallization

25.

Which separation technique is used to obtain pure water from seawater?

a)

Simple distillation

b)

Filtration

c)

Chromatography

d)

Evaporation

26.

What is the name of this separation technique?

a)

distillation

b)

filtration

c)

evaporation

d)

chromatography

27.
Which one of the following is the name for separation technique in the picture below
a)
distillation
b)
dissolving
c)
evaporation
d)
decanting
28.

What method would you use to separate a mixture of salt and water so that you can get keep the salt AND the water?

a)

sorting by hand

b)

distillation

c)

chromatography

29.

No matter what you do, sand will not dissolve in water, because sand is _________.

a)

dissolved

b)

soluble

c)

insoluble

d)

aqueous

30.
What is the boiling point of water?
a)
0oC
b)
100oC
c)
80oC
d)
95oC
31.

How can we separate an insoluble solid from a liquid?

a)

chromatography

b)

evaporation

c)

filtration

d)

condensation

32.

Dyes in water soluble markers may be separated by means of

a)

Distillation

b)

Filtration

c)

Chromatography

d)

Evaporation

33.
A combination that can be separated by physical processes is a .....
a)
Pure Substance
b)
Glucose
c)
Element
d)
Mixture
34.

Sodium chloride can be separated from rock salt by first adding water to the mixture to dissolve the sodium chloride. The separation then takes place in two stages:

a)

evaporation followed by filtration

b)

distillation followed by decanting

c)

filtration followed by evaporation

d)

filtration followed by decanting

35.
Which one of the following would you use to separate sand from iron filings?
a)
a bar magnet
b)
filter paper
c)
chromatography paper
d)
alum