CR Chemistry A Module 2 Lesson 3

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Questions and Answers

What is a primary similarity between science and a jigsaw puzzle?

  • Both require only one type of piece to understand.
  • Both are only understood by experts in their fields.
  • Both can be completed by a single individual quickly.
  • Both involve assembling individual components to create a clearer picture. (correct)

What did Rutherford contribute to the understanding of the atom?

  • He showed that the Thomson model was incomplete. (correct)
  • He was the first to identify the neutron.
  • He discovered that electrons are identical to protons.
  • He proposed that the nucleus contains only protons.

Why don't positively charged protons in the nucleus repel each other?

  • Neutrons neutralize their charge.
  • The nucleus is primarily made of electrons.
  • They are too far apart in the nucleus.
  • A strong nuclear force acts at very short distances. (correct)

Which model proposed that electrons are mixed with a positive core?

<p>Thomson model (A)</p> Signup and view all the answers

What role do neutrons play in the atomic nucleus?

<p>They contribute to the strong nuclear force. (B)</p> Signup and view all the answers

What can be inferred about scientific discoveries based on the jigsaw puzzle analogy?

<p>Individual discoveries may initially seem unrelated. (A)</p> Signup and view all the answers

Which of the following models advanced the understanding of the atomic nucleus by introducing the neutron?

<p>Modern atomic model (D)</p> Signup and view all the answers

What is the purpose of the strong nuclear force?

<p>To hold protons and neutrons together in the nucleus. (D)</p> Signup and view all the answers

Which physicist's experiments helped develop the understanding of the atomic nucleus?

<p>Millikan's (B)</p> Signup and view all the answers

How does the analogy of a jigsaw puzzle relate to research in science?

<p>Different researchers contribute pieces that complete the broader picture. (B)</p> Signup and view all the answers

The strong nuclear force is responsible for holding electrons together in the atomic nucleus.

<p>False (B)</p> Signup and view all the answers

The Rutherford model of the atom proposed that electrons are surrounded by a solid core.

<p>True (A)</p> Signup and view all the answers

Neutrons play no significant role in the atomic structure.

<p>False (B)</p> Signup and view all the answers

Scientific discoveries can be seen as individual pieces of a jigsaw puzzle.

<p>True (A)</p> Signup and view all the answers

The Thomson model correctly described the structure of the atomic nucleus.

<p>False (B)</p> Signup and view all the answers

Positively charged protons in the nucleus repel each other due to their like charges.

<p>False (B)</p> Signup and view all the answers

Millikan's experiments helped clarify the model of the atomic nucleus.

<p>True (A)</p> Signup and view all the answers

The final understanding of atomic structure came about without the influence of multiple researchers.

<p>False (B)</p> Signup and view all the answers

Rutherford was the first to suggest that the atomic model consists of a small solid core.

<p>True (A)</p> Signup and view all the answers

After the discovery of protons and electrons, neutrons were discovered to further clarify the atomic model.

<p>True (A)</p> Signup and view all the answers

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Study Notes

Science as a Jigsaw Puzzle

  • Science is compared to a jigsaw puzzle where individual discoveries contribute to a larger understanding.
  • Researchers make specific discoveries that, when compiled, enhance comprehension of processes or structures.
  • Experiments by scientists like Crooke, Millikan, and Rutherford provided critical insights into the atomic nucleus.

Models of the Atom

  • Early models attempted to depict atomic structure after discoveries of electrons and protons.
  • The Thomson model proposed a positive core with electrons mixed throughout, aiming for electrical neutrality.
  • Rutherford challenged the Thomson model, showing that the nucleus is a small solid core, allowing alpha particles to pass with minimal interaction.
  • Post-Rutherford, the model evolved to depict protons and neutrons at the nucleus center, surrounded by electrons.

Discovery of the Neutron

  • The introduction of the neutron completed the atomic model, solidifying the structure of the nucleus.
  • Protons and neutrons are densely packed in the nucleus, with electrons in orbit around them.

Strong Nuclear Force

  • Despite positive charges of protons potentially causing repulsion, a strong nuclear force is postulated to counteract this.
  • The strong nuclear force operates at very short distances, overpowering the repulsive action of like charges.
  • This force is crucial for the stability of the nucleus, ensuring that protons and neutrons are held together effectively.

Science as a Jigsaw Puzzle

  • Science is compared to a jigsaw puzzle where individual discoveries contribute to a larger understanding.
  • Researchers make specific discoveries that, when compiled, enhance comprehension of processes or structures.
  • Experiments by scientists like Crooke, Millikan, and Rutherford provided critical insights into the atomic nucleus.

Models of the Atom

  • Early models attempted to depict atomic structure after discoveries of electrons and protons.
  • The Thomson model proposed a positive core with electrons mixed throughout, aiming for electrical neutrality.
  • Rutherford challenged the Thomson model, showing that the nucleus is a small solid core, allowing alpha particles to pass with minimal interaction.
  • Post-Rutherford, the model evolved to depict protons and neutrons at the nucleus center, surrounded by electrons.

Discovery of the Neutron

  • The introduction of the neutron completed the atomic model, solidifying the structure of the nucleus.
  • Protons and neutrons are densely packed in the nucleus, with electrons in orbit around them.

Strong Nuclear Force

  • Despite positive charges of protons potentially causing repulsion, a strong nuclear force is postulated to counteract this.
  • The strong nuclear force operates at very short distances, overpowering the repulsive action of like charges.
  • This force is crucial for the stability of the nucleus, ensuring that protons and neutrons are held together effectively.

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