Section 10.2- Oxygen

Question 1

by far the most abundant element in the earth’s crust

Answer 1

oxygen

Question 2

21% of the volume of our atmosphere is

Answer 2

oxygen

Question 3

the element oxygen can exist in two ____________

forms of the same element that differ in their properties but exist in the same physical state

Answer 3

allotropes

Question 4

oxygen is prepared commercially by

Answer 4

distilling liquid air by filtering air through a molecular sieve

Question 5

the oxygen in the earth’s atmosphere is continually replenished by

Answer 5

photosynthesis

Question 6

the two allotropes oxygen can exist in

Answer 6

O2 and O3 (ozone)

Question 7

oxygen is _______________ reactive

Answer 7

moderately

Question 8

the ionic oxides can be

Answer 8

1. “normal” oxides (O 2-)
2. peroxides (O2 2-)
3. super-oxides (O2 -)

Question 9

a very familiar reaction involving oxygen

Answer 9

combustion or burning

Question 10

one of the most important industrial chemicals in the US

Answer 10

oxygen

Question 11

region of the upper stratosphere that produces a higher than normal concentration of ozone

Answer 11

ozone layer

Question 12

an important compound of H and O is

Answer 12

hydrogen peroxide

Question 13

antibacterial action of H2O2 is not due to the oxygen production, but to highly reactive molecules that are produced during other reactions, that cause irreversible damage to bacterial cells

Answer 13

free radicals