Topic 7 - Properties Of Substances

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  • 1/11 Questions

    Why does electrolysis not work, if the electrolyte used is sugar solution?

    • Sugar is covalent / has no ions
    • Sugar is not at the correct temperature
    • There must not be enough sugar in the solution.
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Topic 7 - Properties Of Substances - Quiz
About This Quiz

Explore the properties of substances in 'Topic 7 - Properties of Substances'. This quiz covers electrical conductivity of metals and non-metals, solubility of covalent compounds, and physical states of chemical compounds, enhancing understanding of fundamental chemistry concepts.

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  • 2. 

    Non-metals do not conduct electricity. Which non-metal is the only exception?

    • Carbon (diamond)

    • Carbon (graphite)

    • Silicon

    • Chlorine

    Correct Answer
    A. Carbon (graphite)
    Explanation
    Graphite is the only non-metal that can conduct electricity. This is because graphite has a unique structure where its carbon atoms are arranged in layers that are loosely held together. This allows the free movement of electrons within the layers, enabling graphite to conduct electricity. Other non-metals, such as carbon in the form of diamond, silicon, and chlorine, do not have this structure and therefore cannot conduct electricity.

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  • 3. 
    During an electrolysis, what type of charged particle will flow through the wires?  Electolyte - ProProfs

    During an electrolysis, what type of charged particle will flow through the wires?  Electolyte

    • Protons

    • Electrons

    • Ions

    Correct Answer
    A. Electrons
    Explanation
    Ions are free to move in ionic solutions/melts. Electrons flow through wires.

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  • 4. 

    What state is sodium sulphate likely to be at room temperature?

    • Solid

    • Liquid

    • Gas

    Correct Answer
    A. Solid
    Explanation
    Sodium sulphate is ionic. The attraction between oppositely charged ions is strong and known as the ionic bond. Ionic compounds have high melting and boiling points because the bond is hard to break.

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  • 5. 

    Which of the following will conduct electricity in the state shown.

    • NaOH(s)

    • CuCl2 (s)

    • Sugar (aq)

    • NaCl (aq)

    Correct Answer
    A. NaCl (aq)
    Explanation
    Sugar is covalent - does not conduct electricity in any state.
    NaOH, CuCl2 and NaCl are ionic. Ionic compounds conduct electricity when ions are free to move (in solution or melts)

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  • 6. 
    Which ion electron equation, correctly identifies what is happening at the negative electrode. - ProProfs

    Which ion electron equation, correctly identifies what is happening at the negative electrode.

    • Cu(s) --> Cu2+(aq) + 2e-

    • Cu2+(aq) + 2e- --> Cu(s)

    • 2Cl-(aq) --> Cl2(g) + 2e-

    • Cl2(g) + 2e- --> 2Cl-(aq)

    Correct Answer
    A. Cu2+(aq) + 2e- --> Cu(s)
    Explanation
    Cu2+(aq) ions are attracted to the negative electrode. Red brown copper metal is formed.

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  • 7. 
    Which of the following statements is correct. - ProProfs

    Which of the following statements is correct.

    • A.C. is used, as the products are easily identified,

    • D.C is used, to ensure that electricity flows.

    • D.C is used, as this allows the products to be identified.

    Correct Answer
    A. D.C is used, as this allows the products to be identified.
    Explanation
    DC (Direct current) - each electrode stays with the same charge. This allows the ions to move towards the oppositely charged electrode.

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  • 8. 

    Grease is a covalent compound.  Which of the following liquids is it likely to be soluble in?

    • Water

    • Hydrochloric acid

    • Petrol

    Correct Answer
    A. Petrol
    Explanation
    Covalent substances are soluble in covalent liquids. Petrol is a covalent liquid, so grease should be soluble in it.

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  • 9. 

    In which state(s) do metals conduct electricity?

    • Solid

    • Liquid (melts)

    • Gas

    Correct Answer(s)
    A. Solid
    A. Liquid (melts)
    Explanation
    In solid and molten metals the atoms are close together, outer energy levels overlap and electrons can move freely between the atoms. This is the reason for the high conductivity of metals.

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  • 10. 

    There are a wide range of covalent compounds.  Which state(s) do they exist?

    • Solid

    • Liquid

    • Gas

    Correct Answer(s)
    A. Solid
    A. Liquid
    A. Gas
    Explanation
    Covalent network compounds (eg Silicon dioxide) are solid at room temperature. They have strong covalent bonds that are very difficult to break, so m pt and b pt are very high.
    Covalent molecules (eg water, carbon dioxide) exist as molecules and have no covalent bonds between the molecules so, they have lower m pt and b pts (tend to be liquids or gases at room temperature).

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  • 11. 

    Which of the following would be the correct ionic formula for sodium sulphate?A (Na+)4(SO4 2-)2    B  Na2SO4    C  (Na+)2SO4 2-  D  Na4SO42 

    • (Na+)4(SO4 2-)2

    • Na2SO4

    • (Na+)2SO4 2-

    • Na4SO42

    Correct Answer
    A. (Na+)2SO4 2-
    Explanation
    Remember to add charges for ionic formula.
    Sodium - group 1 - valency 1 - Na+
    Sulphate - complex ion (data book) - SO4 2-(charge 2-/valency 2)

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Dec 07, 2010
    Quiz Created by
    Lslater
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