Ch.1.3

Question 1

We conduct __________________ in the laboratory. A laboratory has different types of ______________ and _______________.

Answer 1

Experiments, equipment, apparatus.

Question 2

Name all the nine safety equipments used in laboratories.

Answer 2

Laboratory coat, safety goggles/ spectacles, gloves, sand bucket, fire blanket, fire extinguisher, fume cupboard, first-aid kit, eye-wash bottle.

Question 3

For bigger fires, which tool do we use to put out fires?

Answer 3

Fire extinguisher.

Question 4

For smaller fires or fires started by liquids or electrical appliances, which tool do we use to put out fires?

Answer 4

Sand bucket.

Question 5

What is the use of a fume cupboard?

Answer 5

It is used to contain gas that leaks, or the spread of bacteria.

Question 6

There are many ________________ in the laboratory. Accidents can happen if we do not pay attention to __________________.

Answer 6

Potential dangers, safety rules.

Question 7

Name eight do rules in the lab.

Answer 7

Listen to the teacher’s instructions, know the fire escape route, read safety precautions before an experiment, wear safety goggles when heating or mixing substances, tie up long hair and tuck in school ties during experiments, wash hands after completing an experiment, keep the lab clean and tidy, report all accidents to teachers at once.

Question 8

Name seven don’t rules in the lab.

Answer 8

Don’t enter the lab without the teacher’s permission, don’t run or play in the lab, don’t eat or drink in the lab, don’t smell or tastes any chemicals unless the teacher asks you to do so, don’t touch hot apparatus, don’t throw solid waste into the sink, don’t point test tubes containing boiling liquids towards yourself or other students.

Question 9

A laboratory is a ________________ place for doing experiments.

Answer 9

Suitable.

Question 10

We need to follow __________________ in the laboratory.

Answer 10

Safety rules.

Question 11

__________________________ warn us of the potential dangers of the chemicals.

Answer 11

Hazard warning symbols.

Question 12

If you see a flammable warning symbol on a chemical, what should you do?

Answer 12

Keep it away from heat or flame.

Question 13

If you see a corrosive warning label on a chemical, what should you do?

Answer 13

Store in a well ventilated room, wear protective gloves and safety goggles while handling chemical.

Question 14

If you see a explosive warning label on a chemical, what should you do?

Answer 14

Keep away from heat and flame, and avoid shock, which may cause chemical to explode.

Question 15

If you see a toxic, irritant or harmful warning label on a chemical, what should you do?

Answer 15

Avoid breathing in the vapour of the chemical, wear protective gloves and safety goggles when handling chemical, wash your hands thoroughly after handling chemical.

Question 16

What should we pay attention to before experiments?

Answer 16

The hazard warning symbols on the containers of chemicals.

Question 17

Action to be taken when there is a cut:

Answer 17

Clean the wound with water an apply a dressing to it.

Question 18

Action to be taken when there are heat burns/ chemical burns:

Answer 18

Place the affected area under slow running water.

Question 19

Action to be taken when you have chemicals in your eyes:

Answer 19

Wash the eyes with distilled water from the eye-wash bottle.

Question 20

Action to be taken when there is a glass breakage:

Answer 20

Clean up broken pieces of glass and dispose of them in a broken glass container; do not throw them into a general rubbish bin

Question 21

Action to be taken when there is a gas leakage:

Answer 21

Turn off the gas supply and open all the windows and doors.

Question 22

Action to be taken when there is a fire:

Answer 22

Keep calm and report to your teacher at once, do not put out the fire by yourself.

Question 23

Conditions for a fire to start: (hint: there are three)

Answer 23

Fuel, high temperature and oxygen.

Question 24

The three conditions fo a fire to start make up the ______________.

Answer 24

Fire triangle.

Question 25

Steps to putting out a fire:

Answer 25

1. Pull the safety pin
2. Aim at the lowest part of the fire
3. Squeeze the handle
4. Sweep from side to side until the fire is put out

Question 26

Describe the use of fire beaters.

Answer 26

Beating the burning plants stops the supply of oxygen to the fire.

Question 27

Describe the use of spaying fire with water.

Answer 27

Spraying water on the fire lowers the heat.

Question 28

Describe the use of cutting down trees to make a firebreak.

Answer 28

Cutting down the trees can remove the fuel and so the fir cannot spread.