Chemistry Class 9 Electric Charge
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Chemistry Class 9 Electric Charge

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Questions and Answers

What kind of experiment did J.J. Thomson conduct to show the existence of electrons in an atom?

  • He observed the attraction between a glass rod and an inflated balloon.
  • He passed electricity through a gas at high pressure.
  • He rubbed two objects together to generate static electricity.
  • He observed streams of cathode rays in a discharge tube. (correct)

    • What do cathode rays consist of?

  • Negatively charged particles called electrons (correct)
  • Positively charged particles
  • Alpha particles
  • Neutrally charged particles

    • What is the significance of an electrically charged object being able to attract an uncharged object?

  • It indicates the presence of charged particles in matter at the atomic level. (correct)
  • It demonstrates the existence of neutrons in atoms.
  • It suggests that all matter is electrically neutral.
  • It proves that atoms are made up of positive and negative charges.

    • How did J.J. Thomson observe the cathode rays in his experiment?

    <p>By passing electricity through a gas at very low pressure</p> Signup and view all the answers

    What did J.J. Thomson's discovery of electrons in an atom demonstrate?

    <p>Atoms are made up of positively and negatively charged particles.</p> Signup and view all the answers

    Why is it said that the mass and charge of cathode ray particles do not depend on the nature of gas in J.J. Thomson's experiment?

    <p>Because the charge and mass of electrons are constant regardless of the gas used.</p> Signup and view all the answers

    What did Thomson conclude about all atoms based on the formation of cathode rays?

    <p>They contain negatively charged particles called electrons</p> Signup and view all the answers

    How does Thomson explain the formation of cathode rays?

    <p>Atoms release fast-moving electrons under high electrical voltage</p> Signup and view all the answers

    How is an electron described based on the information provided?

    <p>A negatively charged particle present in all the elements except hydrogen</p> Signup and view all the answers

    What is the relative mass of an electron compared to a hydrogen atom?

    <p>$1840$ u</p> Signup and view all the answers

    Where are electrons located within an atom?

    <p>Outside the nucleus</p> Signup and view all the answers

    What symbol is commonly used to represent an electron?

    <p>$e$</p> Signup and view all the answers

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