Which is true of free radicals they are powerful

6. Which is true of free radicals?
They are powerful antioxidants.
They readily share electrons.
They have an odd number of electrons.
Correct!
Correct!
They are strong bases.
1 / 1 pts
Question 7
7. Why are free radicals so damaging?
8. Which is not a common redox reaction?

9. After an apple is cut, it discolors. What oxidant causes the discoloration?
10. Which statement about silver tarnishing is true?
The black discoloration is silver oxide.
Tarnishing is caused by hydrogen sulfide.
Correct!
Correct!
Tarnishing is caused by oxygen in the air.
Tarnish can be removed by rubbing the silver object with silver sulfide.
1 / 1 pts
Question 11
11. When a metal ore is smelted,
a metal is reduced.
a metal salt is coverted to a metal oxide.

5/2/16, 4 : 43 PM Quiz Chapter 10: CHE101-01-SP16
Page 5 of 11
a metal is oxidized by carbon.
a metal oxide is reduced.
Correct!
Correct!
1 / 1 pts
Question 12
12. For the following, unbalanced, reaction, the metal is
Fe + O + H O ---> Fe O
0
2 2 2 3
Correct!
Correct!
corroding.
1 / 1 pts
Question 13
13. For the following reaction in the smelting of iron ore, the iron is
2 Fe O + 3 C ---> 4 Fe + 3 CO
2 3
0
2
being oxidized.
Correct!
Correct!