01.
|
i |
ii |
iii |
iv |
v |
|
A |
B |
C |
D |
A |
02. (a) A laboratory is a special room where
scientific experiments are done.
(b) Features of a good chemistry laboratory
ü
It
should have adequate space for carrying out experiments.
ü
It
should have proper lighting.
ü
It
should have proper ventilation.
ü
It
should have a source of water.
ü
It
should have source of heating.
ü
It
should have adequate storage room.
ü
It
should have a fuming chamber.
(c) Laboratory rules after practical
activities
o
Appropriately
dispose of any wastes.
o
Clean
up the equipment and store them safely.
o
Clean
the working surfaces, benches and sinks.
o
Wash
your hands with soap and water.
03. (a) It is beneficial to take note of the
warning signs when working with chemicals in the laboratory so as to ensure
safety in the laboratory.
(b)
|
Chemical Warning Sign |
Meaning |
|
Harmful  |
This is the substance which can cause death
immediately. |
|
Toxic  |
Toxic are the chemical substances which are
poisonous and can cause death immediately. Example of toxic chemicals are hydrazine, mercuric chloride, osmium
tetroxide, white or red phosphorus, sodium azide, and sodium cyanide. |
|
Oxidant  |
These are the substances which support the
burning substances to burn fast. ·
Example of oxidants are hydrogen peroxide, ozone, nitric acid, sulfuric acid, oxygen and potassium
nitrate. |
|
Corrosive  |
These are substances which can burn your skin
when come in contact with the body. Example of corrosive are hydrochloric acid, sulfuric acid, nitric
acid, chromic acid, acetic acid, hydrofluoric acid, ammonium hydroxide,
potassium hydroxide (caustic potash)
and sodium hydroxide (caustic soda) |
|
Explosive
 |
These are chemicals which explode easy. Example of explosive substance is a Gunpowder |
|
Flammable
 |
These are the chemical substances which catch
fire easy. Examples of these substances are Benzene, ethanol and methanol. |
04. (a) Apparatii that can be used for measuring
volumes of liquids in the laboratory are:
ü Pipette
ü Burette
ü Measuring cylinder
ü Measuring syringe
(b) An apparatus used to measure fixed volume of liquid in
the laboratory is a pipette.
05. (a) First Aid is an immediately help
given to the victim before taken to the hospital for further treatment.
(b) It is important to give first Aid to the victim because:
ü
It
helps to reduce the likelihood of death
ü
It
shorten recovery time
ü
It
prevents permanent disability
ü
It
help to reduce pain
ü
It
prevent the victim’s condition from getting worse
06. (a) First aid kit is a small box which
contain items for first Aid.
(b)
|
Component |
Function |
|
Plaster
or adhesive bandage |
It
is used for covering small cuts or wounds |
|
Soap
|
Used
for washing hands, wounds and equipment |
|
Antiseptic
|
Used
for cleaning wounds to kill germs |
|
Cotton
wool |
Used
for cleaning and drying wounds |
|
Petroleum
jelly |
Used
for smoothing chapped skin |
07. Suffocation is the condition in which the
lungs are not getting enough oxygen causing difficulty in breathing. It can be
caused by chemical substances when inhaled.
Procedure:
Remove the causes and remove the victim
from the source or causes of suffocation
Ensure the victim’s airway is open for
air to reach the lungs
Administer cardiopulmonary resuscitation
(CPR). This involves alternately blowing air into the victim’s mouth (mouth –
to – mouth resuscitation) and compressing the chest with both hands
Keep the victim warm using a light
blanket
Seek for medical help immediately
