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mymodules.dtls.unisa.ac.za
CHE1503-25-Y

CHE1503-25-Y

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Small burns from touching hot objects, should be:

None of the other options.

Brought closer to the air condition to cool it off.

Covered immediately with a Band‐Aid to protect it from the oxygen in the air.

Placed under running cold water.

Massaged gently until it feels better.

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How should glassware be stored to prevent damage and accidents in the laboratory?

You need to bring your own glassware

Leave glassware on laboratory benches

Store glassware on high shelves

Store glassware near edges of countertops

Store glassware in designated cabinets or racks

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Appropriate use of glassware is:

None of the other options.

Carrying a glass flask by the neck.

Pull as much as you can when a glass stopper is stuck in the bottle.

Never place hot glass on a cold surface.

When clamping glassware, make sure you tighten it as much as you can.

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One

of the glassware bellow cannot be used without another piece of glassware:

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What should you do if you accidentally drop glassware and it shatters on the floor?

None of the other options.

Ignore the broken glass and continue working

Quickly clean up the broken glass with your hands

Leave the area and wait for someone else to clean it up

Notify others and follow laboratory procedures for cleaning up broken glass

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An unused/leftover chemicals should be:

Thrown into the trash.

Sent out to the Safety Committee.

Returned back to its original container right ‘before’ you leave the lab.

Disposed of in the designated waste container.

Returned back ‘immediately’ to its original container.

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To dispense a required amount of reagent:

Bring the reagent bottle to your bench and return it immediately after you are done.

None of the other options; reagents are not to be dispensed in lab for safety reasons.

Bring the reagent bottle to your bench and pass it to the next student to use.

Take the glassware you want to measure the reagent into and collect it from where the reagent is being kept.

Ask the teacher to dispense it for you.

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Flammable liquids:

Can catch fire easily.

None of the other options.

Need direct flame for heating.

Can become solid quickly.

Do not evaporate unless boiled.

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What happens when you do not dispose of wastes correctly?

Waste poured into the incorrect waste containers, makes it extremely difficult to deal with wates sent for treatment.

All of the other options.

Waste down the drain can corrode pipes, cause problems at treatment plants and cause aquatic damage.

If left behind in the lab, is very difficult to identify and can be incorrectly disposed of.

Waste into the trash bin, can cause dangerous work conditions for cleaning staff. Can pollute waterways if leached into groundwater at landfills.

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You should always hold containers that have chemicals:

Away from your body.

After rotating the lid in the counter-clockwise direction.

With a clean pair of tongs.

With both hands, tightly and near your body.

With a pair of oven gloves.

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