Weekly Test in Chemistry (July 19, 2013)

I.                    Give the uses of the following laboratory apparatuses.

1.       spatula

2.       wash bottle

3.       mortar and pestle

4.       crucible and cover

5.       evaporating dish

6.       thermometer

7.       funnel

8.       tripod

9.       platform balance

10.   volumetric flask

II.                  Illustrate the following.

1.       erlenmeyer flask

2.       watch glass

3.       florence flask

4.       graduated cylinder

5.       beaker

6.       reagent bottle

7.       medicine dropper

8.       test tube

9.       iron stand

10.   iron ring

III.                Give the reasons for the following laboratory operations and techniques.

1.       Glass as the common material in laboratory.

2.       Porcelain as the material of some apparatuses.

3.       Dark colored bottles as container of some of the chemicals.

4.       Not clamping glassware too tightly.

5.       Using a piece of paper when transferring solid chemicals to test tube.

6.       Using a dry and clean spatula in transferring solid chemicals.

7.       Never point a test tube that is being heated towards somebody.

8.       Using a glassrod when pouring liquid chemicals.

9.       Never directly inhale the air to get the odor of a substance.

10.   Using wire gauze in heating.