III.Speaking

Think of three more laboratory items, describe them and their functions. Ask your groupmates to guess what they are.

IV. Listening

a. Listen to the tape and tick the words or word combinations you hear. Then make your own sentences with some of them: measure out, career, piece of equipment, narrow, mechanic, brush, fine powder, tolls, degree, density, beakers, apothecary, and volumetric flask.

b. Complete the following sentences using the words or word combinations from ex. a. Then listen to the tape again and check.

1. The most common … is a balance.

2. The Erlenmeyer flask has a … neck so it is often used for containing and mixing solutions.

3. … is equal to mass divided by volume.

4. …are used for mixing, stirring, heating and pouring liquids.

5. … is used for preparing standard solutions.

c. Listen to the tape and mark the sentences as true or false.

1. There are some different types of balances. T/F

2. The author is going to measure out some grams of liquid sodium chloride. T/F

3. Beakers can come in a single shape and size. T/F

4. A balance is used to determine the mass of a substance. T/F

5. Mortar and Pestle are used to grind an substance up into a fine powder. T/F

6. The Erlenmeyer flask is the best piece of glass and it is very convenient to dissolve solid. T/F

7. The narrow neck of a volumetric flask is perfect for precise measurement of a liquid. T/F

V. Extra activities

Laboratory Safety

Safety is important in any laboratory and all laboratories are outfitted with certain basic instruments. These include fire extinguishers, chemical treatment washes (showers and eye wash stations) and fire sprinklers. Laboratories also have stores of gloves, goggles and protective coats to prevent burns and contact with harmful substances. There are also some symbols used in labs.

a. Look at the WHMIS symbols on the left and try to match them with the meaning on the right.

	Corrosive Material
	Immediately Poisonous and Infectious
	Flammable and Combustible
	Toxic, Poisonous and Infectious
	Dangerously Reactive
	Biohazardous Infectious Material
	Oxidizing Material
	Compressed Gas

b. Answer each of the following questions.

1. What does WHMIS stand for?

2. What is WHMIS used for?

3. What is the difference between the WHMIS and the International safety symbols?

4. What is the significance of the shapes of the international safety symbols?

c. Put the words into correct order.

Laboratory instructions:

1. Rush/ never/ in the/ around /laboratory

2. Loose/out of/ keep/ the way/hair

3. Experiments/as instructed/ do/the teacher/by

4. Play/ at mixing/chemicals/never

5. Food/out/the laboratory/of / keep

6. Your/wash/after/hands/chemicals/using

7. Goggles/wear/heating/a liquid/safety/when/in a test tube

8. Any/report /as soon as/happen/accidents/they

9. To /instructions/listen/read/ and/carefully

10. You/ spill/if /wash it off/a chemical/ water/with/ on your skin/ plenty of