Lab safety

Which one of the scientists below is wrongly matched to his/her contribution?

• Marie Curie - proposed the theory of evolution.

• Albert Einstein - discovered the basic relationship between energy and matter.

• Stephen Hawking - discovered a way to describe black holes mathematically.

• Charles Kao - enabled optical fibres to be used in telecommunications.

• Thomas Edison - invented light bulb.

Which of the following is not an observation that you can make about a glass of iced water at room temperature?

• The glass is cold

• The ice is melting.

• Mist appears on the surface of the glass.

• The water will turn into ice if the temperature drops below 0˚C.

Which hazard warning label should be put on a reagent bottle containing vinegar (醋)?

• B

• D

• H

• F

• E

Which hazard warning label should be put on a reagent bottle containing concentrated hydrochloric acid (濃鹽酸)?

• B

• A

• D

• G

• C

A teacher asks you to heat a beaker of alcohol to 78˚C. The hazard warning label shown is put on the reagent bottle. Which is the correct way to handle this?

• Heat it up with a candle flame.

• Heat it up with a Bunsen flame.

• Heat it up in hot water.

• Tell the teacher that alcohol cannot be heated up because it will catch fire.

You are asked to mix two chemicals together to produce a toxic gas. In what equipment in the lab should you carry out the mixing?

WD-40 is a common lubricant (潤滑劑). The hazard warning label shown can be found on its container. Which of the following is/are safety precaution(s) when handling it?

• Store it in the kitchen.

• Store it in a well-ventilated place.

• Use it in a room when all the windows and doors are closed.

• Put it under the sun.

When handling a toxic chemical, what should you put on your hands to avoid direct contact with it?

When handling a chemical with the hazard warning label above, what should you put on to protect your eyes?

When mixing two chemicals, your classmate spills one chemical into his eye. He is scared and doesn’t know what to do. What would you do to help him before you inform the teacher?

• Ask him to wash his affected eye under running tap water.

• Ask him to wash his affected eye with distilled water from an eye wash bottle.

• Call the ambulance immediately.

• Put clean sterilized dressing over his affected eye.