Unit 1 Sec. C Summary HW 2

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11) Most metals oxidize losing one or more electrons.

12) a. The textbook

b. The textbook is a reliable source.

c. No

13) The textbook because it is a reliable source that explain chemistry well.

14) If you collect inaccurate data or information, you may obtain the wrong results.

15) 19.1 million years

16) a. 32g

b. 48g

c. 100g

d. 58g

e. 180g

17) Copper metal and sodium metal have different molar masses.

18) a. One atom

b. 19.6g/39.1g Half of an atom

c. 3.91g/39.1g = 1/10^th of an atom

19) The percent composition of Cu: 91.7% and Ni: 8.3%

20) a. Ag₂S: 247.81g

b. Al₂O₃: 101.96g

c. CaCO₃: 100.09g