Answers2026-2027_MDCPS_2003345_Chemistry_1_B-CROxidation-Reduction

Oxidation-Reduction — Unit test Answers

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Which rule for assigning oxidation numbers is correct?

A
Hydrogen is usually –1.
B
Oxygen is usually –2.
C
A pure group 1 element is +1.
D
A monatomic ion is 0.
2
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Examine the nuclear reaction: . Why is this classified as a nuclear reaction rather than a chemical reaction?

Question illustration
A
It is not balanced.
B
A new compound is formed.
C
A change has occurred in a nucleus.
D
A new element has been formed.
3

What type of isotope undergoes radioactive decay?

A
one that has a nucleus with the same number of protons and neutrons
B
one that has an unstable nucleus
C
one that has the same number of protons and electrons
D
one that has a stable nucleus
4

Which answer best describes what is happening in the following redox reaction?4Fe + 3O2 2Fe2O3

Question illustration
A
This is combustion.
B
This is neutralization.
C
Iron is oxidized to form rust.
D
Oxygen is oxidized to form rust.
5

Which environmental hazard is directly related to nuclear power production?

A
land stripping
B
global warming
C
radiation leakage
D
soil erosion
6

Disposal of radioactive waste is a major concern in nuclear power production. Which method of disposal is least dangerous?

A
distributing nuclear waste in small quantities in many locations
B
releasing nuclear waste into the atmosphere where living things are not affected
C
encasing nuclear waste in containers that are then taken to remote locations
D
pouring nuclear waste into oceans and larger lakes
7

The atomic symbol represents lead-206 (Pb-206), an isotope that has 82 protons and 124 neutrons. Which atomic symbol could represent an isotope that undergoes radioactive decay to produce Pb-206?

Question illustration
A
Superscript 238 subscript 92 upper U.
Option A
B
Superscript 222 Subscript 87 upper P b
Option B
C
Superscript 178 subscript 72 upper H f.
Option C
D
Superscript 192 subscript 77 upper P b.
Option D
8

Which best describes a chain reaction associated with a nuclear reaction?

A
Neutrons released during a fusion reaction cause other nuclei to fuse.
B
Neutrons released during a fission reaction cause other nuclei to split.
C
Helium nuclei released during a fission reaction cause other nuclei to split.
D
Helium nuclei released during a fusion reaction cause other nuclei to fuse.
9

A target is shielded from a radioactive sample by a sheet of metal. What kind of radiation can pass through the sheet of metal and hit the target?

A
gamma rays only
B
gamma rays and beta particles
C
beta particles only
D
beta particles and alpha particles
10

Consider the incomplete equation below If this equation was completed, which statement would it best support?

Question illustration
A
Nuclear fusion produces elements that are heavier than helium.
B
Nuclear fusion produces elements that are lighter than helium.
C
Nuclear fission produces elements that are heavier than helium.
D
Nuclear fission produces elements that are lighter than helium.
11

Which quantity can be calculated using the equation E = mc2?

A
the energy needed to split an atom into separate protons, neutrons, and electrons
B
the energy needed to split the nucleus into separate protons and neutrons
C
the energy needed to remove an electron from an atom
D
the energy needed to add an electron to an atom
12

What part of an atom is involved in a chemical reaction?

A
proton
B
neutron
C
nucleus
D
electron
13

An isotope undergoes radioactive decay by emitting radiation that has no mass. What other characteristic does the radiation have?

A
some shielding required
B
positive or negative charge
C
low penetrating power
D
no charge
14

Which energy transformation occurs in the core of a nuclear reactor?

A
nuclear energy mechanical energy
Option A
B
nuclear energy thermal energy
Option B
C
thermal energy nuclear energy
Option C
D
mechanical energy nuclear energy
Option D
15

Which type of reaction does this diagram represent?

Question illustration
A
nuclear fission because an atom is splitting into two fragments
B
nuclear fusion because the products that are produced are radioactive
C
nuclear fission because a large amount of energy is being released
D
nuclear fusion because atomic nuclei combine to form a heavier nucleus
16

What is the sequence of energy transformations that occur in a nuclear reactor?

A
nuclear energy mechanical energy thermal energy electrical energy
Option A
B
nuclear energy thermal energy mechanical energy electrical energy
Option B
C
thermal energy nuclear energy mechanical energy electrical energy
Option C
D
electrical energy thermal energy mechanical energy nuclear energy
Option D
17

Which of the following is not an oxidation-reduction reaction?

A
XeF6(s) XeF4(s) + F2(g)
Option A
B
2Cs(s) + I2(g) 2CsI(s)
Option B
C
2H2SO4(aq) + 2Ba(OH)2(aq) 2BaSO4(s) + 4H2O(l)
Option C
D
Zn(s) + 2AgNO3(aq) Zn(NO3)2(aq) + Ag(s)
Option D
18

O-18, an isotope of oxygen, has a stable nucleus. O-19, another isotope of oxygen, does not have a stable nucleus. Based on this information, which statement is correct?

A
O-19 is radioactive; O-18 is not radioactive.
B
O-19 has a mass defect; O-18 does not have a mass defect.
C
O-19 has a nuclear binding energy; O-18 does not have a nuclear binding energy.
D
O-19 has more neutrons than protons; O-18 has equal numbers of neutrons and protons.
19

A fusion reaction takes place between carbon and another element. Neutrons are released, and a different element is formed. The different element is

A
lighter than helium.
B
heavier than helium.
C
used for energy on Earth.
D
radioactive.
20

What is the oxidation number for N in the compound NH3? (Recall that H usually has an oxidation number of +1.)

A
–3
B
–1
C
0
D
+3

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