2. An atom is electrically neutral because

the numbers of protons and electrons are equal.

nuclear forces stabilize the charges.

neutrons balance the protons and electrons

the numbers of protons and electrons are equal.

the numbers of protons and neutrons are equal

7. In Rutherford's experiments, alpha particles

were used to bombard thin metal foil

were used to bombard a cathode plate

passed through a tube containing gas.

were used to bombard thin metal foil

8. Thomson performed the plum pudding model, which is right about it

its not actually correct model about the atom

Copy Of Quiz 1 Chemistry 10 D

1.
1. An aluminum isotope consists of 13 protons, 13 electrons, and 14 neutrons. Its mass number is
- A.
  
  14
- B.
  
  13
- C.
  
  27
- D.
  
  40
Correct Answer
C. 27

Explanation
The mass number of an atom is the sum of its protons and neutrons. In this case, the aluminum isotope has 13 protons and 14 neutrons, giving a total of 27. Therefore, the mass number of this aluminum isotope is 27.

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2.

2. An atom is electrically neutral because
- A.
  
  Nuclear forces stabilize the charges.
- B.
  
  Neutrons balance the protons and electrons
- C.
  
  The numbers of protons and electrons are equal.
- D.
  
  The numbers of protons and neutrons are equal
Correct Answer
C. The numbers of protons and electrons are equal.

Explanation
An atom is electrically neutral because the numbers of protons and electrons are equal. Protons have a positive charge, while electrons have a negative charge. These charges balance each other out, resulting in a neutral atom. The presence of neutrons in the nucleus does not affect the overall charge of the atom, as neutrons have no charge. Therefore, it is the equal number of protons and electrons that ensures the electrical neutrality of an atom.

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3.

3. Which part of an atom has a mass approximately equal to 1/2000 of the mass of a common hydrogen atom?
- A.
  
  Protons
- B.
  
  Electrons
- C.
  
  Neutrons
- D.
  
  Both protons and neutrons
Correct Answer
B. Electrons

Explanation
The correct answer is electrons. Electrons are subatomic particles that orbit the nucleus of an atom and have a negative charge. They have a very small mass compared to protons and neutrons, with a mass approximately equal to 1/2000 of the mass of a common hydrogen atom. Protons and neutrons, on the other hand, are located in the nucleus and have much larger masses.

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4.

4. After measuring the ratio of the charge of a cathode-ray particle to its mass, Thomson concluded that the particles
- A.
  
  Had a very small mass
- B.
  
  Had no mass.
- C.
  
  Carried a positive charge.
- D.
  
  Had a very large mass.
Correct Answer
A. Had a very small mass

Explanation
Thomson concluded that the particles had a very small mass because he measured the ratio of the charge of the cathode-ray particle to its mass. This implies that the particles have a small mass compared to their charge.

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5.

5. Experiments with cathode rays led to the discovery of the
- A.
  
  Electrons with high mass
- B.
  
  Electrons with low mass
- C.
  
  Negatively charge particles
- D.
  
  Both b and c
Correct Answer
D. Both b and c

Explanation
Experiments with cathode rays led to the discovery of electrons with low mass and negatively charged particles. Cathode rays were found to be streams of negatively charged particles, which were later identified as electrons. The experiments also revealed that these electrons have a very low mass compared to other particles. Therefore, the correct answer is both b and c.

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6.

6. In a glass tube attached to a voltage source, electrical current passes from the negative electrode, called the ____, to the other electrode
- A.
  
  Anode
- B.
  
  Cathode
- C.
  
  Electron
- D.
  
  Protons
Correct Answer
B. Cathode

Explanation
In a glass tube attached to a voltage source, electrical current passes from the negative electrode, called the cathode, to the other electrode. The cathode is the electrode where reduction occurs, meaning it gains electrons. It is negatively charged and attracts positive ions or protons. The other electrode, called the anode, is positively charged and attracts negative ions or electrons. Therefore, the correct answer is cathode.

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7.

7. In Rutherford's experiments, alpha particles
- A.
  
  Were used to bombard a cathode plate
- B.
  
  Passed through a tube containing gas.
- C.
  
  Collided with electrons.
- D.
  
  Were used to bombard thin metal foil
Correct Answer
D. Were used to bombard thin metal foil

Explanation
In Rutherford's experiments, alpha particles were used to bombard thin metal foil. This is because Rutherford wanted to study the structure of atoms and he hypothesized that atoms had a dense, positively charged nucleus at their center. By bombarding the thin metal foil with alpha particles, Rutherford observed that some of the particles were deflected at large angles or even bounced back. This unexpected result led him to conclude that the positive charge of an atom is concentrated in a small, dense nucleus, surrounded by mostly empty space.

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8.

8. Thomson performed the plum pudding model, which is right about it
- A.
  
  Its not actually correct model about the atom
- B.
  
  Atom looks like watermelon
- C.
  
  Charges are like seeds
- D.
  
  All the above
Correct Answer
D. All the above

Explanation
The plum pudding model, performed by Thomson, is not actually correct about the atom. This model suggests that the atom is a positively charged sphere with negatively charged electrons embedded within it, resembling a watermelon with seeds. Therefore, all of the given options (its not actually correct model about the atom, atom looks like watermelon, charges are like seeds) are correct explanations for the plum pudding model.

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9.

9. a charge responsible for the atom's mass
- A.
  
  Neutrons
- B.
  
  Electrons
- C.
  
  Protons
- D.
  
  None of the above
Correct Answer
C. Protons

Explanation
Protons are positively charged particles found in the nucleus of an atom. They have a mass of approximately 1 atomic mass unit (amu), which is responsible for the atom's mass. Electrons, on the other hand, have a negligible mass compared to protons and are responsible for the atom's charge. Neutrons are also found in the nucleus and have a mass similar to protons, but they do not carry any charge. Therefore, protons are the correct answer as they are the charged particles responsible for the atom's mass.

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10.

10. carbon atom has 6 electrons, and it's mass number is 13, so the number of neutrons is
- A.
  
  8 neutrons
- B.
  
  6 neutrons
- C.
  
  7 neutrons
- D.
  
  9 neutrons
Correct Answer
C. 7 neutrons

Explanation
The mass number of an atom is the sum of its protons and neutrons. In this case, the carbon atom has a mass number of 13. Since the atomic number of carbon is 6 (which is equal to the number of protons), the number of neutrons can be calculated by subtracting the atomic number from the mass number. Therefore, the carbon atom has 7 neutrons.

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Copy Of Quiz 1 Chemistry 10 D

An aluminum isotope consists of 13 protons, 13 electrons, and 14 neutrons. Its mass number is

2. An atom is electrically neutral because

3. Which part of an atom has a mass approximately equal to 1/2000 of the mass of a common hydrogen atom?

4. After measuring the ratio of the charge of a cathode-ray particle to its mass, Thomson concluded that the particles

5. Experiments with cathode rays led to the discovery of the

6. In a glass tube attached to a voltage source, electrical current passes from the negative electrode, called the ____, to the other electrode

7. In Rutherford's experiments, alpha particles

8. Thomson performed the plum pudding model, which is right about it

9. a charge responsible for the atom's mass

10. carbon atom has 6 electrons, and it's mass number is 13, so the number of neutrons is