1C Jan 2013 Flashcards

1
Q

What colour is chlorine gas?

A

Green

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2
Q

What is bromine at room temperature?

A

Liquid

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3
Q

Iron + sulphuric acid

A

iron sulphate + hydrogen

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4
Q

Hydrous copper sulphate?

A

CuSO4.5H20

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5
Q

Why is helium more suitable for filling balloons than hydrogen?

A

Non-flammable

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6
Q

Show the process that occurs when hydrogen is liquefied.

A

H2(g) -> H2(l)

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7
Q

During the extraction of aluminium what is the half equation at the anode?

A

2O2– → O2 + 4e–

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8
Q

During the extraction of aluminium what effect does this reaction have on the positive electrodes?

A

Electrodes get smaller.

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9
Q

In the blast furnace name the raw material that reacts with oxygen and state why the reaction is important.

A

Coke - produces heat.

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10
Q

Name two uses of CO2 and why CO2 is good for these?

A

Carbonating drinks - soluble in water. Fire extinguishers - denser than air.

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11
Q

What does the negative H indicate about the reaction?

A

Exothermic.

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12
Q

Explain how the atoms are held together in a hydrogen bromide molecule.

A

Shared electrons attracted to both nuclei.

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13
Q

Explain why sodium bromide has a higher melting point than hydrogen bromide.

A

Ionic bonding + and - ions. Ionic bonding is stronger so more energy is required to break bonds, therefore higher melting point.

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