# 3.E: Homework Chapter 3 Answers

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General Questions

1. Atoms

3. In geometric patterns with long range, repeating order

5. Chemical change

7. No, the law of conservation of mass

9. The measure of thermal energy

11. Element and compound

Classifying Matter

13.        a. Element

b. Compound

c. Element

d. Compound

15.

a. Solid: oscillate/vibrate around a fixed point

b. Liquid: Free to move relative to one another

c. Gas: Free to move relative to one another

17.        a. Mixture, homogenous

b. Mixture, heterogeneous

c. Pure substance, element

d. Pure substance, compound

19.        Gases

Physical and Chemical Properties and Physical and Chemical Changes

21.        a. Chemical

b. Physical

c. Physical

d. Chemical

23.        a. Chemical change

b. Chemical change

c. Physical property

d. Physical property

e. Physical property

f. Physical change

25.        Physical properties are displayed without changing the composition of a substance (color, odor, density, etc.) and chemical properties are displayed only through the change in a substance’s composition (flammability, ability to rust, etc.).

27. Chemical

29. Physical

31. Chemical

Conservation of Mass

33. In chemical and physical changes, the amount of mass must remain constant.

35. 7.3 g

37. 507.6 g

Converting Between Temperature Scales

39. 7.2° C

41. 195 K

43. 212° F

Challenge Problems

45. 373 K, 212 ° F

47. From left to right: Atomic element, Molecular element, Compound, Mixture

49. From left to right:  Pure Substance, Pure Substance, Mixture, Mixture

3.E: Homework Chapter 3 Answers is shared under a not declared license and was authored, remixed, and/or curated by LibreTexts.