Question

part b: true/false write t for true or f for false. 1. gases are allowed in the lab if you wear goggles. 2. gas particles are tightly packed and do not move. 3. rust forming on iron is a chemical change. 4. solids have definite shape and volume. 5. mixtures can be separated physically. 6. a beaker always measures liquids more accurately than a graduated cylinder. 7. water freezing into ice is a physical change. 8. always eat and drink in the lab. part c: matching (6 items, 1 point each) match the item in column a with the correct description in column b. column a column b 19. thermometer a) used for holding small samples of liquid 20. bunsen burner b) worn to protect clothing in lab 21. test tube c) used to measure temperature 22. fire extinguisher d) used as a heating apparatus 23. lab coat e) used as a three - legged stand for beakers 24. tripod f) used to put out fires

Explanation:

1. Cookies are not typically a focus in a standard lab context. False.
2. Gas particles are not tightly - packed and move freely. False.
3. Rust forming on iron is a chemical reaction involving oxidation. True.
4. Solids have a definite shape and volume due to their molecular arrangement. True.
5. Mixtures can be separated by physical means like filtration, evaporation etc. True.
6. A graduated cylinder measures liquids more accurately than a beaker. False.
7. Water freezing into ice is a change of state, a physical change. True.
8. Eating and drinking in the lab is a safety hazard. False.

For the matching part:

• A thermometer is used to measure temperature. So 19 - c.
• A Bunsen burner is used as a heating apparatus. So 20 - d.
• A test tube is used for holding small samples of liquid. So 21 - a.
• A fire extinguisher is used to put out fires. So 22 - f.
• A lab coat is worn to protect clothing in lab. So 23 - b.
• A tripod is used as a three - legged stand for beakers. So 24 - e.

Answer:

1. False
2. False
3. True
4. True
5. True
6. False
7. True
8. False
9. c) Used to measure temperature
10. d) Used as a heating apparatus
11. a) Used for holding small samples of liquid
12. f) Used to put out fires
13. b) Worn to protect clothing in lab
14. e) Used as a three - legged stand for beakers