Chemistry Paper 1 Exam Questions And
Verified Answers
Give xone xuse xof xFullerene x- xCORRECT✅✅- xdrug xdelivery xaround xthe xbody
- xlubricants
Explain xwhy xgraphite xis:
- xA xgood xelectrical xconductor x
- xsoft xand xslippery x- xCORRECT✅✅- xthree x(covalent) xbonds xper xcarbon xatom
- xso xone xelectron xper xcarbon xatom x(is xdelocalised) x• xthese xdelocalised xelectrons x
- xcan xmove xthrough xthe xstructure x
- xcarrying x(electrical) xcharge x
- xso xgraphite xconducts xelectricity
• xlayered xstructure
• xwith xweak x(intermolecular) xforces xbetween xlayers
• xso xthe xlayers xcan xslide xover xeach xother x
• xso xgraphite xis xsoft xand xslippery
Explain xwhy xthe xreactivity xof xelements xchanges xas xyou xgo xdown xGroup x1 x-
xCORRECT✅✅- xreactivity xincreases x(going xdown xthe xgroup)
- x(because) xthe xouter xelectron xis xfurther xfrom xthe xnucleus x
- x(so) xthere xis xless xattraction xbetween xthe xnucleus xand xthe xouter xelectron x
- x(so) xthe xatom xloses xan xelectron xmore xeasily
Explain xwhy xsodium xoxide xhas xa xhigh xmelting xpoint x- xCORRECT✅✅- xgiant
xstructure x
- xstrong x(electrostatic) xforces xof xattraction xbetween x(oppositely xcharged) xions x
- xlarge xamounts xof xenergy xare xneeded xto xbreak xthe xbonds
Name xthe xsalt xproduced xby xthe xneutralisation xof xhydrochloric xacid xwith xpotassium
xhydroxide. x- xCORRECT✅✅Potassium xChloride
Why xdo xwe xheat xup xthe xmixture xwhen xwe xdo xcrystalisation? x- xCORRECT✅✅So
xit xspeed xup xthe xreaction
Why xdo xwe xfilter xthe xmixture xin xcrystalisation? x- xCORRECT✅✅To xremove
xexcess xpowder
Explain xwhy xalloys xare xharder xthan xpure xmetals x- xCORRECT✅✅- xIn xan xalloy
xthe xatoms xare xof xdifferent xsizes x
- xso xthe xlayers xare xdistorted x
- xthe xlayers xslide xover xeach xother xless xeasily
Verified Answers
Give xone xuse xof xFullerene x- xCORRECT✅✅- xdrug xdelivery xaround xthe xbody
- xlubricants
Explain xwhy xgraphite xis:
- xA xgood xelectrical xconductor x
- xsoft xand xslippery x- xCORRECT✅✅- xthree x(covalent) xbonds xper xcarbon xatom
- xso xone xelectron xper xcarbon xatom x(is xdelocalised) x• xthese xdelocalised xelectrons x
- xcan xmove xthrough xthe xstructure x
- xcarrying x(electrical) xcharge x
- xso xgraphite xconducts xelectricity
• xlayered xstructure
• xwith xweak x(intermolecular) xforces xbetween xlayers
• xso xthe xlayers xcan xslide xover xeach xother x
• xso xgraphite xis xsoft xand xslippery
Explain xwhy xthe xreactivity xof xelements xchanges xas xyou xgo xdown xGroup x1 x-
xCORRECT✅✅- xreactivity xincreases x(going xdown xthe xgroup)
- x(because) xthe xouter xelectron xis xfurther xfrom xthe xnucleus x
- x(so) xthere xis xless xattraction xbetween xthe xnucleus xand xthe xouter xelectron x
- x(so) xthe xatom xloses xan xelectron xmore xeasily
Explain xwhy xsodium xoxide xhas xa xhigh xmelting xpoint x- xCORRECT✅✅- xgiant
xstructure x
- xstrong x(electrostatic) xforces xof xattraction xbetween x(oppositely xcharged) xions x
- xlarge xamounts xof xenergy xare xneeded xto xbreak xthe xbonds
Name xthe xsalt xproduced xby xthe xneutralisation xof xhydrochloric xacid xwith xpotassium
xhydroxide. x- xCORRECT✅✅Potassium xChloride
Why xdo xwe xheat xup xthe xmixture xwhen xwe xdo xcrystalisation? x- xCORRECT✅✅So
xit xspeed xup xthe xreaction
Why xdo xwe xfilter xthe xmixture xin xcrystalisation? x- xCORRECT✅✅To xremove
xexcess xpowder
Explain xwhy xalloys xare xharder xthan xpure xmetals x- xCORRECT✅✅- xIn xan xalloy
xthe xatoms xare xof xdifferent xsizes x
- xso xthe xlayers xare xdistorted x
- xthe xlayers xslide xover xeach xother xless xeasily
