Quiz  /  Chemistry Class 9 MCQ Questions With Answers

  • 1. 
    A molecule is formed when two or more ____________ chemically join together.

  • Atoms
  • Compounds
  • Mixtures
  • Solutions

  • 2. 
    What does a represent?

  • Proton
  • Neutron
  • Electron

  • 3. 
    Gamma rays damage human cells/tissue.

  • True
  • False

  • 4. 
    In a chemical reaction, reactants contact each other, bonds between atoms in the reactantsare broken, and

  • atoms rearrange and form new bonds to make the products.
  • atoms remain the same and do not form new bonds to make the proudcts

  • 5. 
    Which of the following changes is a physical change of matter?

  • water evaporating
  • paper burning
  • a nail rusting
  • a silver spoon tarnishing

  • 6. 
    The type of reaction that releases energy as heat is called

  • endothermic
  • exothermic
  • respiration
  • photosynthesis

  • 7. 
    Atomic number is

  • the number of protons
  • the number of electrons
  • the number of neutrons
  • the location of an atom on the periodic table

  • 8. 
    What is the atomic mass of this atom?

  • 1
  • 3
  • 4
  • 7

  • 9. 
    A molecule is

  • a singular particle of a particular element
  • another name for an element
  • 2 or more atoms that are combined

  • 10. 
    Why type of bond is forming between the atoms in the diagram?

  • Ionic
  • Covalent

  • 11. 
    The time needed for half of a radioactive sample to decay is called its __________.

  • decay period
  • period
  • transmutation time
  • half-life

  • 12. 
    When an acid reacts with a metal following is the product

  • salt + hydrogen
  • salt + carbon dioxide + water

  • 13. 
    B and C are found in the ______ of an atom.

  • electron cloud
  • Space
  • Nucleus
  • Outside

  • 14. 
    Characteristics of metals on the periodic table are

  • they are not able to be oxidised
  • they are poor conductors of heat and electricity
  • have free electrons

  • 15. 
    Balance the following equation:146C --> 0-1e + ________

  • 145B
  • 146C
  • 147N
  • 42He

  • 16. 
    Which type of radioactive decay gives off energy only (no particles)?

  • alpha
  • beta
  • gamma

  • 17. 
    What type of hydrocarbon is shown above?

  • Alkane
  • Alkene
  • Alkyne
  • None of the above

  • 18. 
    An ionic bond forms when

  • valence electrons are shared back and forth (move between) two atoms.
  • a sea of mobile electrons surround the cations and they then become negativly charged
  • valence electrons are transferred from one atom to another, forming charged ions that are then pulled together by attraction between opposite charges
  • none of the above

  • 19. 
    Electrons

  • no charge, nucleus
  • positive charge, nucleus
  • negative charge, shells
  • negative charge, nucleus

  • 20. 
    In the atom diagram shown, A is pointing to the darker particles, these are known as

  • electrons
  • protons
  • neutrons
  • the nucleus

  • 21. 
    Protons have ________________

  • negative charge, nucleus
  • positive charge, shells
  • positive charge , nucleus
  • neutral charge, nucleus

  • 22. 
    Water is the product of the reactants:

  • oxygen and water
  • oxygen and carbon
  • hydrogen and oxygen

  • 23. 
    An elements is

  • a substance that cannot be split into simpler substances
  • a substance that can be split into simpler substances

  • 24. 
    Which of the following is a pure substance?

  • air
  • granite
  • water
  • stainless steel

  • 25. 
    When 2.02 X 1023 is multiplied by 3.1 X 10-31, the product is

  • 6.3 X 10-8
  • 6.3 X 108
  • 6.3 X 1054
  • 6.3 X 10-54

  • 26. 
    Has the symbol

  • Alpha
  • Beta
  • Gamma

  • 27. 
    What is a hydrocarbon?

  • A compound composed of carbon and water
  • A compound composed of carbon and hydrogen
  • A compound composed of carbon and oxygen
  • A compound composed of carbon and nitrogen

  • 28. 
    The characteristics or properties of metals include

  • shiny and solid
  • ductile and malleable
  • lose electrons
  • all of the above
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