5th Mini Quiz Semester 2

1. What nonmetal is a component of both steel and stainless steel?
- C (Carbon)
* Brass-copper and zinc
* Bronze-copper, zinc, tin, etc.
* Steel-Iron, carbon

2. C3H3(g) + O2 --> CO2(g) H2O(g) Explain the reaction of propane.
- Hydrocarbon is burning to make carbon dioxide and water. 

3. Which gains and which loses electrons in this reaction: Cu(s) + Ag+(aq) --> Cu2+(aq) + Ag(s)?
- Cu loses 2 and silver gains 2.

4. What has 12 protons, 12 neutrons, 10 electron?
- Mg2+

5. Which is NOT a hydrocarbon?
- CH4
- C8H18
- Cu 
- C3H8

Answer: Cu (copper)

6. Percent Composition. What percent by mass is the hydrogen in H2O?
- 2g/18g X 100 = 11%

7. Percent Composition: What percent by mass is the copper in CuO?
- 64g/80g X 100 = 80%

8. How many moles are in 58 g of NaCl?
- 1 mol

14. How many moles are in 38 g of F2?
- 1 mol.