Year 9 Chemistry Mid Unit Revision

25 Questions | Total Attempts: 66

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Year 9 Chemistry Mid Unit Revision

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Questions and Answers
  • 1. 
    The positively charged particle in an atom is the:
    • A. 

      Protons

    • B. 

      Neutrons

    • C. 

      Electrons

    • D. 

      Orbitals

  • 2. 
    The maximum numbers of electrons in the first four energy levels of an atom are:
    • A. 

      2, 8, 8, 18

    • B. 

      2, 4, 6, 8

    • C. 

      2, 14, 26, 28

    • D. 

      2, 2, 8, 12

  • 3. 
    When an atom loses an electron, it becomes a:
    • A. 

      Negative ion

    • B. 

      Positive ion

    • C. 

      Polyatomic ion

    • D. 

      Neutral ion

  • 4. 
    Which of the following terms could be used to describe the matter in this image? 
    • A. 

      Single atoms

    • B. 

      Molecules

    • C. 

      Compound

    • D. 

      Element

  • 5. 
    Which of the following terms could be used to describe the matter in this image? 
    • A. 

      Single atoms

    • B. 

      Molecules

    • C. 

      Compound

    • D. 

      Element

  • 6. 
    Which of the following terms could be used to describe the matter in this image? 
    • A. 

      Single atoms

    • B. 

      Molecules

    • C. 

      Elements

    • D. 

      Mixture

  • 7. 
    Which of the following word equations is correct for a reaction between copper and oxygen? 
    • A. 

      Copper + oxygen -> carbon dioxide

    • B. 

      Copper + oxygen -> copper sulfide

    • C. 

      Copper + oxygen -> copper oxide

    • D. 

      Copper + oxygen -> copper iodide

  • 8. 
    The chemical symbols of chlorine, potassium, copper, sodium, nitrogen and iron in order are:
    • A. 

      Cl, P, Co, So, Ni, I

    • B. 

      Cl, K, Cu, Na, N, Fe

    • C. 

      Cl, K, Co, So, N, Fe

    • D. 

      Cl, Po, Co, Na, N, Fe

  • 9. 
    What is a chemical compound?
    • A. 

      A combination of two protons and two electrons

    • B. 

      A combination of two or more chemical elements bonded together

    • C. 

      A mixture of two or more chemical elements

    • D. 

      Any substance that contains chemically bonded particles

  • 10. 
    Which one of the following is a mixture?
    • A. 

      Sea water

    • B. 

      Distilled water

    • C. 

      Iron oxide

    • D. 

      Oxygen

  • 11. 
    Natural gas is mainly methane (CH4). What two elements are found in methane?
    • A. 

      Cobolt and helium

    • B. 

      Copper and holmium

    • C. 

      Carbon and hydrogen

    • D. 

      Carbon and helium

  • 12. 
    Which of the following statements is NOT true? 
    • A. 

      There are approximately 118 identified elements

    • B. 

      An element is defined by its number of electrons - this is how elements are ordered in the periodic table

    • C. 

      An element's atomic number indicates its number of protons

    • D. 

      You can find an element's neutrons by subtracting the number of protons from the atomic mass

  • 13. 
    Cadmium's atomic number is ______________. Thus, an atom of cadmium has ___________ protons and ___________ electrons. If cadmium has 64 neutrons, its mass number is ___________.  
  • 14. 
    A beryllium atom has 4 protons, 5 neutrons, and 4 electrons. What is the mass of this atom?
    • A. 

      5

    • B. 

      8

    • C. 

      9

    • D. 

      13

  • 15. 
    Which electronic structure is correct for an element with 17 electrons?
    • A. 

      1,7

    • B. 

      10, 7

    • C. 

      2, 8, 7

    • D. 

      2, 8, 8, 18

  • 16. 
    What do the elements in a group have the same number of?
    • A. 

      Electrons

    • B. 

      Occupied shells

    • C. 

      Protons

    • D. 

      Valence electrons

  • 17. 
    Which of these electronic structures belongs to a noble gas?
    • A. 

      2

    • B. 

      2, 7

    • C. 

      2, 8, 2

    • D. 

      2, 8, 7

  • 18. 
    Following the law of conservation of mass, if a student mixes 250g of sugar, 250g of water and 5g of colouring, the product will have a mass of:
    • A. 

      500

    • B. 

      505

    • C. 

      503

    • D. 

      55

  • 19. 
    Which of the following statements best defines the law of conservation of mass?
    • A. 

      Mass cannot be created but it can be destroyed under extreme pressures.

    • B. 

      When added to a system, energy can destroy mass.

    • C. 

      The mass of a closed system cannot change over time; mass cannot be created nor destroyed.

    • D. 

      Mass cannot be conserved during a chemical reaction; a little bit of mass is always lost.

  • 20. 
    Why is it important to know the 'sensitivity' of your balance when doing a conservation of matter experiment?
    • A. 

      To eliminate all measurement errors.

    • B. 

      To change data as necessary.

    • C. 

      To make sure you prove the law.

    • D. 

      To know the level of accuracy of your measurements.

  • 21. 
    In a chemical reaction, the mass of the products must always equal the mass of:
    • A. 

      The gases released

    • B. 

      The reactants

    • C. 

      The solids put into the reaction

    • D. 

      The whole system

  • 22. 
    Which of the following correctly match the X in this atom? 
    • A. 

      It is positively charged

    • B. 

      It is negatively charged

    • C. 

      It is the location of protons

    • D. 

      It is the location of electrons

    • E. 

      It is the location of neutrons

    • F. 

      It contains most of the mass of an atom

    • G. 

      It contains most of the volume of an atom

  • 23. 
    ¹⁴₆C and ¹²₆C are examples of carbon:
    • A. 

      Valences

    • B. 

      Ions

    • C. 

      Isotopes

    • D. 

      Molecules