- Loses hydrogen
- Gains oxygen
Oxidation occurs when a molecule does any of the following:
Loses electrons
If a molecule undergoes oxidation, it has been oxidized and it is the reducing agent
(aka reductant).
Reduction occurs when a molecule does any of the following:
Gains electrons
If a molecule undergoes reduction, it has been reduced and it is the oxidizing agent (aka oxidant).
Every redox reaction must have an oxidant and a reductant. There has to be oxidation to have reduction!
Try clicking on the best answer.
1.With respect to energy content and possible use as fuels, oxidized forms of matter
are generally
a) low in potential energy, and often make good fuels
b) high in potential energy, and often make good fuels
c) low in potential energy and are poor fuels
d) high in potential energy, and are poor fuels
2. The corrosion of metals, such as the rusting of iron, is an example of
a) reduction
b) oxidation
c) proton transfer
d) transmutation
3. The air that we breathe is composed of approximately _________% of oxygen by volume?
4. Which one of the following IS NOT one of the definitions of oxidation?
a) Oxidation is the addition of oxygen to a substance
b) Oxidation is the addition of hydrogen to a substance
c) Oxidation is the loss of electrons from a substance
d)Oxidation is the loss of hydrogen from a substance
5. When C3H8 is burned in oxygen, the products are
a) C + H2
b)CH2 + H2O
c)CO2 + H2
d) CO2 + H2O
6. In the following reaction, which reactant is being oxidized? Ag2 +
Al -------------> Ag + Al2S3
a) S b)Ag2S c) Al d)Al2S3
7. Sodium bisulfite converts bromine (Br2) to bromide (Br-). Sodium
bisulfite is a(n)
a) acid
a) base
c) oxidizing agent
d) reducing agent
8. In the following reaction: C2H6O2 ----> C2H4O2
+ H2
C2H6O2 is
a) oxidized b) reduced c) neutralized d) electrolyzed
9. In the reaction Cu2+ + Fe ----> Cu + Fe2+
a) iron is oxidized
b) copper is oxidized
c) copper(II) is the reducing agent
d) none of these
10. In a reaction, the substance undergoing reduction serves as the
a) electron donor b) proton donor c) oxidizing agent d) reducing agent
11. In a reaction, the substance undergoing oxidation serves as the
a) electron donor b) proton donor c) oxidizing agent d) oxidant
12. An electrochemical cell converts chemical energy into
a) chemical energy b) light energy c) electrical energy d)nuclear energy
13. In the reaction Fe2O3 + 3H2 ---> 2Fe + 3H2O
the reducing agent is
a) Fe2O3
b) H2
c) Fe
d) H2O
14. The removal of silver tarnish from silverware using aluminum foil and a solution of
electrolyte is an example of
a)oxidation of aluminum metal
b) reduction of silver ions
c) aluminum is a reducing agent
d) all of the above
15. Antiseptics are substances that
a) are pain killers b) kill
microorganisms c) relieve inflammation d)
are the same as anesthetics
16. Most household bleaches act as
a) oxidizing agents b) reducing
agents c) electron donors d) proton donors
17. Human cells obtain energy by
a) oxidizing carbohydrates
b) reducing proteins
c) reducing carbon dioxide
d) absorbing sunlight