Extra Flashcards

1
Q

What is the colour change when chlorine gas in bubbled into sodium bromide?

A

Colourless to orange

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2
Q

Ionic equation for neutralisation?

A

H+ (aq) + OH- (aq) -> H2O (l)

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3
Q

How would you obtain pure dry copper sulphate crystals from filtrate of copper oxide + sulphuric acid. (Excess copper oxide has Been filtered off)

A

Evaporate filtrate to half volume.
Allow to cool and crystallise
Dry between 2 pieces of paper

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4
Q

What colour is aluminium hydroxide?

A

White

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5
Q

Observations when calcium carbonate + hydrochloric acid?

A

Heat released
Disappears
Colourless solution formed

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6
Q

Chemical test for aluminium ions?

Validity?

A

Add NaOH, white precipitate forms.
Add excess, precipitate redissolves.
Zinc ions give same result.

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7
Q

What is an element?

A

Cannot be broken down by chemical means.

Pure substance made up of only 1 type of atom.

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8
Q

What is an allotrope?

A

Different structure of same element in the same physical state.

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9
Q

How would the results change if you kept the same mass of a metal but used powder instead of ribbon?

A

Faster reaction and steeper slope.

Finishes at same gas volume.

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10
Q

Why does calcium oxide have a high melting point?

A

Strong ionic bonds between calcium and oxide ions which require lots of energy to break.

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11
Q

Write a balanced symbol equation for the reaction between calcium oxide and water.

A

CaO + 2H2O -> Ca(OH)2

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12
Q

Are these reactions endothermic or exothermic?

- Combustion, Photosynthesis, Condensation, Freezing and Neutralisation.

A

Exothermic, Endothermic, Exothermic, Exothermic and Exothermic.

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13
Q

State the colour change when copper (ii) carbonate is heated.

A

Green to black

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14
Q

What is the line at the top of chromatography paper called?

A

Solvent front

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15
Q

What label should be placed on the bottom of an HPLC graph?

A

Retention time

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16
Q

Why do covalently bonded compounds only conduct electricity when molten?

A

When molten the ions can move and carry charge

17
Q

Why does chlorine have a low melting point?

A

Little energy required to break the Weak Van der Waals’ forces between chlorine molecules

18
Q

Why does graphite conduct electricity?

A

Delocalised electrons can move and carry charge

19
Q

What is the structure of diamond?

A

Each carbon atom covalently bonded to 4 other carbon atoms in a tetrahedral structure