Laboratory

2. We should place an _________ mat below the Bunsen burner.
5. A _____ tube is a larger version of a test tube.
6. This means a proposed explanation to our observations.
8. Safety ___________ protect our eyes.
10. _____ errors may happen if we forget to reset an electronic balance to zero.
11. Wear __________ gloves when handling corrosive substances.
13. Used for transferring powder or solids.
15. We measure _______ variables in a fair test.
16. The part of a light microscope which is closest to the eye.
17. This kind of flame is noisier and has a lower temperature.
18. A bottle used for storing liquids, with a stopper.
19. We can use a measuring ________ to measure volume.

1. We use a _______ burner for heating substances.
3. When heating liquid in a test tube, we should rotate the tube in _______ to ensure uniform heating.
4. The light bulb is an ________, not a discovery.
7. Used for measuring temperature.
9. We should first use the _______ adjustment knob to adjust the stage of the microscope.
12. Used for measuring time in a laboratory.
14. If we forget to close the air-hole, a ______-back may happen.