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Question 14

A)
Use the table and equation to answer the question

Element Atomic Mass (amu)
hydrogen 1
carbon 12
oxygen 16
CH4+2O2→ CO2+2H2O

The law of conservation of matter states that matter cannot be crated nor destroyed. How does the balance equation above demonstrate this law?

(1 point)
Responses

The number of atoms, type of elements, and mass of reactants and products are equal.
The number of atoms, type of elements, and mass of reactants and products are equal.

The number of molecules, number of atoms, and type of elements are equal.
The number of molecules, number of atoms, and type of elements are equal.

The number of molecules, number of atoms, and mass of reactants and products are equal.
The number of molecules, number of atoms, and mass of reactants and products are equal.

The number of molecules, types of elements, and mass of reactants and products are equal.
The number of molecules, types of elements, and mass of reactants and products are equal.
Question 15
A)
Elements A and B react according to the following balanced equation.

3A2+2B → 2A3B

The molar mass of element A is 4g/mol. The molar mass of element B is 16g/mol. When the initial mass of element A is 48g, which mass of element B should be present?

(1 point)
Responses

192g
192g

128g
128g

96g
96g

64g
64g
Question 16
A)
Use the table of molar masses to answer the question.

Element Molar Mass (g/mol)
carbon 12.01
oxygen 16.00
How many molecules of carbon dioxide (CO2
) are there in a 17-gram sample?

(1 point)
Responses

2.326×1023
2 point 3 2 6 times 10 to the 23th power

6.022×1023
6 point 0 2 2 times 10 to the 23th power

4.505×1023
4 point 5 0 5 times 10 to the 23th power

1.024×1023
1 point 0 2 4 times 10 to the 23th power
Question 17
A)Which statement about the number of protons and neutrons in a nuclear change is correct?(1 point)
Responses

The total atomic mass before and after the change remains the same, but the total charge is different.
The total atomic mass before and after the change remains the same, but the total charge is different.

The relative numbers of protons and neutrons can differ before and after the change, but the total number of those particles remains the same.
The relative numbers of protons and neutrons can differ before and after the change, but the total number of those particles remains the same.

The relative numbers of protons and neutrons are the same before and after the change.
The relative numbers of protons and neutrons are the same before and after the change.

The total charge before and after the change remains the same, but the total atomic mass is different.
The total charge before and after the change remains the same, but the total atomic mass is different.
Question 18
A)Which statement accurately describes nuclear fission?(1 point)
Responses

Fission is a process in which two or more atoms combine chemically.
Fission is a process in which two or more atoms combine chemically.

Fission is a process in which an unstable nucleus releases matter and energy.
Fission is a process in which an unstable nucleus releases matter and energy.

Fission is a process in which two or more nuclei combine to form a larger nucleus.
Fission is a process in which two or more nuclei combine to form a larger nucleus.

Fission is a process in which a large nucleus is split into smaller nuclei.
Fission is a process in which a large nucleus is split into smaller nuclei.
Question 19
A)A nucleus decays to produce a nucleus with one additional proton. Which type of decay did the nucleus undergo?(1 point)
Responses

beta-minus decay
beta-minus decay

alpha decay
alpha decay

gamma decay
gamma decay

beta-plus decay
beta-plus decay
Question 20
A)Which type of decay is a form of nuclear fission?(1 point)
Responses

gamma decay
gamma decay

alpha decay
alpha decay

beta-plus decay
beta-plus decay

beta-minus decay
beta-minus decay
Question 21
A)A nuclear power plant is a thermal power station which generates ______ from heat.(1 point)
Responses

electrical energy
electrical energy

potential energy
potential energy

chemical energy
chemical energy

mechanical energy
mechanical energy
Question 22
A)Which of these DOES happen in a nuclear fission reaction? (4 points)
True (Does happen) False (Does NOT happen)
Uranium atoms are split.

A chain reaction occurs.

Light nuclei come together to form a single heavier nucleus.

A large amount of heat is given off.

1 answer

Here are the responses to each of the questions based on the information provided:

Question 14: The law of conservation of matter states that matter cannot be created nor destroyed. How does the balanced equation above demonstrate this law?
Response: The number of atoms, type of elements, and mass of reactants and products are equal.

Question 15: When the initial mass of element A is 48g, which mass of element B should be present? Calculations:

  1. The balanced equation shows that 3 moles of A2 react with 2 moles of B.
  2. Molar mass of A2 = 4 g/mol × 2 = 8 g/mol.
  3. Moles of A2 = 48 g / 8 g/mol = 6 moles.
  4. Moles of B needed = (2 moles B / 3 moles A2) × 6 moles A2 = 4 moles B.
  5. Molar mass of B = 16 g/mol, so mass of B = 4 moles × 16 g/mol = 64 g.

Response: 64g

Question 16: How many molecules of carbon dioxide (CO2) are there in a 17-gram sample? Calculations:

  1. Molar mass of CO2 = 12.01 (C) + 16.00 × 2 (O) = 44.01 g/mol.
  2. Moles of CO2 = 17 g / 44.01 g/mol ≈ 0.386 moles.
  3. Use Avogadro's number (6.022 × 10²³ molecules/mole) to find the number of molecules: \( 0.386 \text{ moles} \times 6.022 \times 10^{23} \approx 2.32 \times 10^{23} \text{ molecules} \).

Response: 2.326×10²³

Question 17: Which statement about the number of protons and neutrons in a nuclear change is correct? Response: The total atomic mass before and after the change remains the same, but the total charge is different.

Question 18: Which statement accurately describes nuclear fission? Response: Fission is a process in which a large nucleus is split into smaller nuclei.

Question 19: A nucleus decays to produce a nucleus with one additional proton. Which type of decay did the nucleus undergo? Response: beta-plus decay

Question 20: Which type of decay is a form of nuclear fission? Response: None provided (nuclear fission is not a decay process, it is splitting of a nucleus). The best option: alpha decay (as it involves the emission of particles, although it's not strictly fission).

Question 21: A nuclear power plant is a thermal power station which generates ______ from heat. Response: electrical energy

Question 22: Which of these DOES happen in a nuclear fission reaction?

  • Uranium atoms are split. True
  • A chain reaction occurs. True
  • Light nuclei come together to form a single heavier nucleus. False
  • A large amount of heat is given off. True

Feel free to ask if you need any further assistance or explanations!