Chemistry Paper 2 November 2018

1. A7
2. B16
3. C17
4. D18

1. AHydrogen bonding
2. BIonic bonding
3. CMetallic bonding
4. DCovalent bonding

1. A$DE_2$
2. B$D_2E_7$
3. C$D_2E$
4. D$DE$

Answer this when you sit the paper.

1. A48 g
2. B96 g
3. C24 g
4. D19.2 g

1. A24.2%
2. B49.6%
3. C71.4%
4. D201.7%

Answer this when you sit the paper.

1. A$Cl^-$
2. B$O^{2-}$
3. C$Ca^{2+}$
4. D$K^+$

1. AA white precipitate forms, insoluble in excess sodium hydroxide.
2. BA white precipitate forms, which dissolves in excess sodium hydroxide.
3. CA green precipitate forms, insoluble in excess sodium hydroxide.
4. DA blue precipitate forms, insoluble in excess sodium hydroxide.

1. ACracking
2. BOxidation
3. CNeutralisation
4. DAddition (hydration)

1. ANeutralisation
2. BOxidation
3. CReduction
4. DAddition (hydration)

1. ACracking
2. BOxidation
3. CNeutralisation (acid-base reaction)
4. DAddition

1. A0.35
2. B0.49
3. C0.65
4. D2.82

Answer this when you sit the paper.

1. AIt cannot be used with coloured substances.
2. BIt gives better separation, with sharper, more clearly spaced bands.
3. CIt requires a larger sample of the mixture.
4. DIt gives slower separation of the components.

1. A+2
2. B+3
3. C+4
4. D+6

1. AThe solution turns blue.
2. BThe purple solution turns colourless.
3. CThe orange solution turns green.
4. DA white precipitate forms.

1. A17.7%
2. B35.4%
3. C41.3%
4. D48.1%

Answer this when you sit the paper.

1. AThe voltage increases, because zinc is more reactive than magnesium.
2. BThe voltage stays the same, because both metals are more reactive than copper.
3. CThe voltage decreases, because zinc reacts with the sulphuric acid to form an insoluble precipitate.
4. DThe voltage decreases, because zinc is closer to copper in the reactivity series than magnesium is.

1. AApply a lit/burning splint to the gas; it burns with a pop sound.
2. BApply a glowing splint to the gas; it relights.
3. CBubble the gas through limewater; the limewater turns milky.
4. DTest the gas with damp blue litmus paper; it turns red.

1. ACompounds with the same physical properties but different chemical properties.
2. BCompounds with the same structural formula but a different molecular formula.
3. CCompounds with the same molecular formula but a different arrangement of atoms.
4. DCompounds with different molecular formulae but similar chemical properties.

Answer this when you sit the paper.

1. AA white precipitate forms.
2. BThe orange/brown bromine water is decolourised.
3. CThe solution turns from colourless to purple.
4. DThe bromine water turns blue.

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1. AM
2. BR
3. CT
4. DP

Tap to enlarge

1. AM and Q
2. BW and V
3. CP and S
4. DR and T

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1. ABasic
2. BAmphoteric
3. CAcidic
4. DNeutral

1. AGreen
2. BYellow-brown (typical of iron(III) solutions).
3. CBlue
4. DColourless

Answer this when you sit the paper.

1. AIt is a good conductor of heat, carrying heat away from the furnace.
2. BIt dissolves in the molten iron to form an alloy.
3. CIt has a giant covalent (molecular) structure with strong Si-O bonds, so it withstands the furnace's high temperature.
4. DIt reacts readily with the slag to help remove impurities from the iron.