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1. How many electrons in an argon atom?

18

19

40

17

Question 1 of 10

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2. What does the symbol ΔH mean

enthalpy (energy) change

exothermic

specific heat capacity

heat energy

Question 2 of 10

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3. Name the product formed at the cathode during the electrolysis of water

hydrogen

oxygen

chlorine

hydroxide

Question 3 of 10

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4. A substance is found not to conduct electricity even when molten. What type of bonding does the substance have?

Ionic

Covalent or ionic

Metallic

Covalent

Question 4 of 10

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5. Explain, by referring to the electronic configurations, why lithium is less reactive than sodium.

Sodium has the electronic configuration 2,8,1 and lithium has 2,8,8,1. The outer electron in lithium is more attracted to the nucleus than in sodium because it is further away. So sodium is more reactive than lithium

Sodium has the electronic configuration 2,8,1 and lithium has 2,1. The outer electron lost from sodium is closer to the nucleus therefore the electron is more attracted by the nucleus. So sodium is more reactive than lithium

Sodium has the electronic configuration 2,8,1 and lithium has 2,1. The outer electron lost from sodium is further from the nucleus therefore the electron is less attracted by the nucleus. So sodium is more reactive than lithium

Sodium has the electronic configuration 2,8,1 and lithium has 2,8,8,1. The outer electron in lithium is less attracted to the nucleus than in sodium because it is further away. So lithium is more reactive than sodium

Question 5 of 10

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6. State the expression for calculating molar volume of a gas.

Molar volume = amount (in grams) x 24 dm³ (or 24,000 cm³)

Molar volume = amount (in moles) / 24 dm³ (or 24,000 cm³)

Molar volume = amount (in grams) / 24 dm³ (or 24,000 cm³)

Molar volume = amount (in moles) x 24 dm³ (or 24,000 cm³)

Question 6 of 10

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7. Explain the term saturated

A molecule that is usually a solid at room temperature

A molecule that is poisonous

A molecule that will not react with anything

A molecule containing only single bonds

Question 7 of 10

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8. What will happen to the equilibrium position when we increase temperature? Give a reason for your prediction. A (g) + B (g) ⇋ C (g) (-∆H)

Equilibrium will move to the left because the forward reaction is endothermic

Equilibrium will move to the right because the forward reaction is exothermic

Equilibrium will shift to the left, because forward reaction is exothermic

Equilibrium will move to the right because the forward reaction is endothermic

Question 8 of 10

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9. What colour and state is bromine at room temperature?

Orange liquid

Brown gas

Red-brown liquid

Grey solid

Question 9 of 10

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10. What is the molecular formula for ethane?

C₃H₈

C₄H₈

C₂H₄

C₂H₆

Question 10 of 10

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Hydr0Gen2022-03-09T21:22:06+00:00Categories: Uncategorized|Tags: Quiz|

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