Topic 7 - Properties Of Substances
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Non-metals do not conduct electricity. Which non-metal is the only exception?
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Carbon (diamond)
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Carbon (graphite)
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Silicon
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Chlorine
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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.
In which state(s) do metals conduct electricity?
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Solid
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Liquid (melts)
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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.Rate this question:
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- 3.
Which of the following will conduct electricity in the state shown.
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NaOH(s)
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CuCl2 (s)
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Sugar (aq)
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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)Rate this question:
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- 4.
Grease is a covalent compound. Which of the following liquids is it likely to be soluble in?
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Water
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Hydrochloric acid
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Petrol
Correct Answer
A. PetrolExplanation
Covalent substances are soluble in covalent liquids. Petrol is a covalent liquid, so grease should be soluble in it.Rate this question:
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- 5.
What state is sodium sulphate likely to be at room temperature?
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Solid
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Liquid
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Gas
Correct Answer
A. SolidExplanation
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.Rate this question:
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- 6.
There are a wide range of covalent compounds. Which state(s) do they exist?
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Solid
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Liquid
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Gas
Correct Answer(s)
A. Solid
A. Liquid
A. GasExplanation
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).Rate this question:
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- 7.
During an electrolysis, what type of charged particle will flow through the wires? Electolyte
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Protons
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Electrons
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Ions
Correct Answer
A. ElectronsExplanation
Ions are free to move in ionic solutions/melts. Electrons flow through wires.Rate this question:
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- 8.
Which ion electron equation, correctly identifies what is happening at the negative electrode.
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Cu(s) --> Cu2+(aq) + 2e-
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Cu2+(aq) + 2e- --> Cu(s)
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2Cl-(aq) --> Cl2(g) + 2e-
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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.Rate this question:
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- 9.
Which of the following statements is correct.
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A.C. is used, as the products are easily identified,
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D.C is used, to ensure that electricity flows.
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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.Rate this question:
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- 10.
Why does electrolysis not work, if the electrolyte used is sugar solution?
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Sugar is covalent / has no ions
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Sugar is not at the correct temperature
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There must not be enough sugar in the solution.
Correct Answer
A. Sugar is covalent / has no ionsExplanation
For electrolysis to work, the electrolyte must be an ionic solution or melt, this allows the ions to complete the circuit. Sugar is covalent / does not have ions.Rate this question:
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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
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(Na+)4(SO4 2-)2
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Na2SO4
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(Na+)2SO4 2-
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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)Rate this question:
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Current Version
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Mar 21, 2023Quiz Edited by
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Dec 07, 2010Quiz Created by
Lslater