Which of the following statements is correct.

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

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

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

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.

Topic 7 - Properties Of Substances | Attempts: 203

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Quizzes Created: 5 | Total Attempts: 8,078

Questions: 11 | Attempts: 203 | Updated: Mar 21, 2023

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Topic 7 - Properties Of Substances - Quiz

SG Chemistry (Scotland) Topic 7 - Properties of substances

Questions and Answers

1.

Non-metals do not conduct electricity. Which non-metal is the only exception?
- A.
  
  Carbon (diamond)
- B.
  
  Carbon (graphite)
- C.
  
  Silicon
- D.
  
  Chlorine
Correct Answer
B. 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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2.

In which state(s) do metals conduct electricity?
- A.
  
  Solid
- B.
  
  Liquid (melts)
- C.
  
  Gas
Correct Answer(s)
A. Solid
B. 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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3.

Which of the following will conduct electricity in the state shown.
- A.
  
  NaOH(s)
- B.
  
  CuCl2 (s)
- C.
  
  Sugar (aq)
- D.
  
  NaCl (aq)
Correct Answer
D. 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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4.

Grease is a covalent compound. Which of the following liquids is it likely to be soluble in?
- A.
  
  Water
- B.
  
  Hydrochloric acid
- C.
  
  Petrol
Correct Answer
C. 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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5.

What state is sodium sulphate likely to be at room temperature?
- A.
  
  Solid
- B.
  
  Liquid
- C.
  
  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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6.

There are a wide range of covalent compounds. Which state(s) do they exist?
- A.
  
  Solid
- B.
  
  Liquid
- C.
  
  Gas
Correct Answer(s)
A. Solid
B. Liquid
C. 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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7.

During an electrolysis, what type of charged particle will flow through the wires? Electolyte
- A.
  
  Protons
- B.
  
  Electrons
- C.
  
  Ions
Correct Answer
B. Electrons

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

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8.

Which ion electron equation, correctly identifies what is happening at the negative electrode.
- A.
  
  Cu(s) --> Cu2+(aq) + 2e-
- B.
  
  Cu2+(aq) + 2e- --> Cu(s)
- C.
  
  2Cl-(aq) --> Cl2(g) + 2e-
- D.
  
  Cl2(g) + 2e- --> 2Cl-(aq)
Correct Answer
B. 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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9.

Which of the following statements is correct.
- A.
  
  A.C. is used, as the products are easily identified,
- B.
  
  D.C is used, to ensure that electricity flows.
- C.
  
  D.C is used, as this allows the products to be identified.
Correct Answer
C. 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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10.

Why does electrolysis not work, if the electrolyte used is sugar solution?
- A.
  
  Sugar is covalent / has no ions
- B.
  
  Sugar is not at the correct temperature
- C.
  
  There must not be enough sugar in the solution.
Correct Answer
A. Sugar is covalent / has no ions

Explanation
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.

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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
- A.
  
  (Na+)4(SO4 2-)2
- B.
  
  Na2SO4
- C.
  
  (Na+)2SO4 2-
- D.
  
  Na4SO42
Correct Answer
C. (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

Topic 7 - Properties Of Substances

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

In which state(s) do metals conduct electricity?

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

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

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

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

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

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

Which of the following statements is correct.

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

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

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