AnswersLVA-Earth and Space Science 1cr.Nuclear Fission and Nuclear Fusion

Nuclear Fission and Nuclear Fusion — Cumulative exam Answers

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Which value is most likely to be the pH of a salt solution that is formed by the reaction of a strong acid and a weak base?

A
2.0
B
7.0
C
8.0
D
10.0
2
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The reaction of a Lewis acid with a Lewis base would most likely be accompanied by an increase in which item?

A
covalent bonds
B
hydronium ions
C
electron pairs
D
hydroxide ions
3

Which represents the ionization of a strong electrolyte?

A
CH3OH(l) CH3OH(aq)
Option A
B
K3PO4(s) 3K+(aq) + PO43–(aq)
Option B
C
H2CO3(aq) H+(aq) + HCO3–(aq)
Option C
D
CH3COOH(aq) + H2O(l) H3O+(aq) + CH3COO–(aq)
Option D
4

Which is a characteristic of nuclear fission?

A
releases nonradioactive waste only
B
involves the collision of two nuclei
C
releases small amounts of energy compared to fossil fuels
D
involves the splitting of an atom into two or more fragments
5

A radioactive nuclide that is used for geological dating has an atomic number of 19 and mass number 40. Which is the symbol of this nuclide?

A
Superscript 19 subscript 21 upper K.
Option A
B
Superscript 21 subscript 19 upper K.
Option B
C
Superscript 40 subscript 19 upper K.
Option C
D
Superscript 19 subscript 40 upper K.
Option D
6

What is a common use of bases?

A
as a component of vinegar
B
as a component of car batteries
C
to make foods tart
D
to reduce indigestion
7

A student requires 2.00 L of 0.100 M NH4NO3 from a 1.75 M NH4NO3 stock solution. What is the correct way to get the solution?Use .

Question illustration
A
Measure 114 mL of the 1.75 M solution, and dilute it to 1.00 L.
B
Measure 114 mL of the 1.75 M solution, and dilute it to 2.00 L.
C
Measure 8.75 mL of the 1.75 M solution, and dilute it to 2.00 L.
D
Measure 8.75 mL of the 0.100 M solution, and dilute it to 2.00 L.
8

Which value is most likely to be the pH of a salt solution that is formed by the reaction of a weak acid and a strong base?

A
2.0
B
6.8
C
7.0
D
8.7
9

The molar mass of NaOH is 40.00 g/mol. If 5.20 g NaOH are dissolved in 0.500 L of solution, what is the molarity of the solution?Use .

Question illustration
A
0.0125 M
B
0.260 M
C
3.85 M
D
7.69 M
10

A student who is studying atomic reactions creates the following Venn diagram.How should the student label each circle in this diagram?

Question illustration
A
reaction A: chemical; reaction B: nuclear
B
reaction A: nuclear; reaction B: chemical
C
reaction A: strong nuclear; reaction B: weak nuclear
D
reaction A: weak nuclear; reaction B: strong nuclear
11

Which is an example of ionization?

A
C + O2 CO2
Option A
B
H2CO3 H2O + CO2
Option B
C
SO2 + H2O HSO3– + H+
Option C
D
Mg(OH)2 Mg2+ + 2OH–
Option D
12

Consider the balanced equation. PCl3 + 3H2O H3PO3 + 3HCl What is the percent yield of HCl if 42.0 g of HCl are produced from the reaction of 62.0 g of PCl3?Use .

Question illustration
A
28.4%
B
72.8%
C
85.0%
D
93.5%
13

What is the nuclear binding energy of an atom that has a mass defect of 1.643 10–28 kg? Use E = mc2. (Remember: The speed of light is approximately 3.00 108 m/s.)

Question illustration
A
1.83 10–46 J
Option A
B
4.93 10–20 J
Option B
C
1.48 10–11 J
Option C
D
5.48 1045 J
Option D
14

The volume of a fixed amount of gas is doubled, and the absolute temperature is doubled. According to the ideal gas law, how has the pressure of the gas changed?

A
It has increased to two times its original value.
B
It has increased to four times its original value.
C
It has decreased to one-half its original value.
D
It has stayed the same.
15

A sample of propane (C3H8) has a mass of 0.47 g. The sample is burned in a bomb calorimeter that has a mass of 1.350 kg and a specific heat of 5.82 J/(g • °C). How much energy is released by the reaction if the temperature of the calorimeter rises by 2.87°C?Use .

Question illustration
A
7.85 kJ
B
10.6 kJ
C
22.5 kJ
D
47.9 kJ
16

A sample of an unknown substance has a mass of 0.158 kg. If 2,510.0 J of heat is required to heat the substance from 32.0°C to 61.0°C, what is the specific heat of the substance?Use .

Question illustration
A
0.171 J/(gi°C)
B
0.548 J/(gi°C)
C
15.9 J/(gi°C)
D
86.6 J/(gi°C)
17

A chemistry journal requires that all new research papers be peer reviewed by other scientists before they are published. This allows which of the following?

A
The reviewers can determine the experiment’s feasibility.
B
The reviewers can determine the experiment’s validity.
C
The reviewers can include their own findings with the research.
D
The reviewers can determine if they will help fund the research.
18

How does heat differ from temperature?

A
Temperature is the measure of heat.
B
Temperature and heat are the same thing.
C
Temperature measures thermal energy, and heat is the flow of thermal energy.
D
Temperature measures the loss of energy, and heat measures the gain of energy.
19

Two cups of coffee, one that is at 10°C and one that is at 20°C, are mixed. Which statement about the temperature of the mixture is correct?

A
There is no kinetic energy transfer so the temperature of the coffee in the warmer cup is the final temperature.
B
The kinetic theory dictates that the temperature of the coffee in the cooler cup is the final temperature.
C
Energy is transferred from faster moving molecules to slower moving molecules, and the result is the average of 15°C.
D
Energy transfer occurs as the molecules collide, and the result is additive; the final temperature is 30°C.
20

A sample of ammonia reacts with oxygen as shown.4NH3(g) + 5O2(g) 4NO(g) + 6H2O(g)What is the limiting reactant if 4.0 g of NH3 react with 8.0 g of oxygen?

Question illustration
A
O2 because it produces only 0.20 mol of NO.
B
NH3 because it produces only 0.20 mol of NO.
C
O2 because it produces two times less NO than NH3.
D
NH3 because it produces three times more NO than O2.

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