chapter 2: study guide

Question 1

what’s a compound?

Answer 1

a substance that can be decomposed to simpler substances, they have fixed compositions

Question 2

examples of compounds

Answer 2

water (H2O), hydrogen peroxide (H2O2), sodium chloride (NaCl), methane (CH4)

Question 3

what are mixtures?

Answer 3

they consist of two or more substances that are physically mixed

Question 4

what are the 2 types of mixtures?

Answer 4

homogenous or solution: same composition
heterogenous: vary in composition

Question 5

what is an element?

Answer 5

a substance that cannot be decomposed to simpler substances

Question 6

what are physical changes?

Answer 6

changes in matter that do not change the composition of a substance (ex. change in temperature, volume, and shape)

Question 7

what are chemical changes?

Answer 7

result in new substances (ex. oxidation, combustion, and decomposition)

Question 8

what are intensive properties?

Answer 8

are independent of the amount of the substance that is present (ex. color, odor, density, melting point, and hardness)

Question 9

what are extensive properties?

Answer 9

depend upon that amount of substance present (ex. mass, volume, and energy)

Question 10

what are the 2 properties under physical properties?

Answer 10

extensive and intensive properties