AnswersChemistryRedox and Nuclear Chemistry

Redox and Nuclear Chemistry — Test Answers

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Which type of reaction does this diagram represent?

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
2
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Which environmental hazard is directly related to nuclear power production?

A
radiation leakage
B
soil erosion
C
land stripping
D
global warming
3

This reaction was carried out in an acidic solution. cap i raised to the negative plus IO power sub 3 raised to the negative right arrow cap i sub 2 power Which statement is true about this equation?

A
Although it is unbalanced, it can be balanced by using the half-reaction method.
B
It has been balanced by using the half-reaction method.
C
It has been balanced by directly using spectator ions.
D
Although it is unbalanced, it can be balanced by directly using spectator ions.
4

Uranium- 232 has a half-life of 68 point 8 years. After 344 point 0 years, how much uranium- 232 will remain from a 100 point 0 - g sample?

A
3 point 1 3 g
B
1 point 5 6 g
C
20 point 0 g
D
5 point 0 0 g
5

Consider the reaction. 2 cap k plus Br sub 2 rightarrow 2 cap k raised to the plus 2 power Br raised to the negative power What is being reduced?

A
only Br sub 2
B
only cap k
C
neither cap k nor Br sub 2
D
both cap k and Br sub 2
6

A radioactive nuclide has 53 protons and 78 neutrons. Which is the symbol of this nuclide?

A
78 to the 131th power Pt
B
53 to the 131th power cap i
C
53 to the 78th power Pt
D
78 to the 53th power cap i
7

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

A
nuclear energy right arrow mechanical energy
B
mechanical energy right arrow nuclear energy
C
nuclear energy right arrow thermal energy
D
thermal energy right arrow nuclear energy
8

Consider these half reactions for a chemical reaction. Zn rightarrow Zn raised to the 2 plus power times A q plus 2 e raised to the negative power Cu raised to the 2 plus power times A q plus 2 e raised to the negative right arrow Cu times s power What is the overall equation for this chemical reaction?

A
Zn times s plus Cu raised to the 2 plus power times A q rightarrow Zn raised to the 2 plus power times A q plus Cu times s
B
Zn2⁢(a⁢q)+Cu(s)→Cu2+⁢(a⁢q)+​Zn(s)
C
Zn(s)+Cu2+⁢(a⁢q)→Cu2+⁢(a⁢q)+2​e−​
D
Zn2+⁢(a⁢q)+2​e→Cu2+⁢(a⁢q)​+2​e−
9

Which answer best describes what is happening in this redox reaction? 4 Fe plus 3 cap o sub 2 rightarrow 2 Fe sub 2 cap o sub 3

A
This is neutralization.
B
Iron is oxidized to form rust.
C
This is combustion.
D
Oxygen is oxidized to form rust.
10

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 and beta particles
B
beta particles and alpha particles
C
gamma rays only
D
beta particles only
11

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.
12

Which of these is the best argument for switching from combustion-powered cars to fuel cell cars in order to help the environment?

A
They decrease the reliance on other countries for non-renewable resources.
B
They use hydrogen, which produces water vapor instead of CO sub 2 .
C
They decrease the money spent by consumers on transportation.
D
They conserve gasoline reserves so they can be burned in the future.
13

Which of these is not an oxidation-reduction reaction?

A
2 Cs s plus cap i sub 2 times g rightarrow 2 CsI s
B
2 cap h sub 2 SO sub 4 A q plus 2 Ba OH sub 2 A q rightarrow 2 BaSO sub 4 s plus 4 cap h sub 2 cap o l
C
XeF sub 6 times s rightarrow XeF sub 4 times s plus cap f sub 2 of g
D
Zn times s plus 2 AgNO sub 3 A q rightarrow Zn open paren NO sub 3 close paren sub 2 A q plus Ag times s
14

A sample contains 16 point 7 5 g of the radioisotope cap u - 236 and 50 point 2 5 g of its daughter isotope, Th - 232 How long did it take for decay to take place if one half-life of cap u - 236 is 23 million years?

A
115 million years
B
92 million years
C
46 million years
D
69 million years
15

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

A
encasing nuclear waste in containers that are then taken to remote locations
B
pouring nuclear waste into oceans and larger lakes
C
distributing nuclear waste in small quantities in many locations
D
releasing nuclear waste into the atmosphere where living things are not affected
16

What is a characteristic of all fuel cells?

A
Energy from the Sun is converted into electricity.
B
Electrical energy is produced from oxidation reactions.
C
A constant source of energy is not required.
D
Oxidation reactions are used to produce thermal energy.
17

Which rule for assigning oxidation numbers is correct?

A
A monatomic ion is 0 .
B
A pure group 1 element is plus 1 .
C
Hydrogen is usually negative 1 .
D
Oxygen is usually negative 2 .
18

Consider the nuclear equation. 94 to the 239th power Pu rightarrow cap x plus 2 to the 4th power He What is X ?

A
92 to the 235th power cap u
B
96 to the 235th power Cm
C
96 to the 243th power Cm
D
92 to the 243th power cap u
19

Which radioisotope is used as a tracer in nuclear scanning?

A
carbon - 14
B
iodine- 129
C
technetium- 99 m
D
uranium- 238
20

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

A
proton
B
nucleus
C
electron
D
neutron

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