n0 xx chemistry paper 2 sl markscheme化学试卷评分.pdfVIP

–6–N12/4/CHEMI/SP2/ENG/TZ0/XX/M

SECTIONA

1.(a)(i)I2(s):four/4andICl(l):three/3;[1]

⎛2.24⎞–2

(ii)n(Cl)⎜⎟0.0316/3.16×10(mol);

2

⎝2×35.45⎠

–2–2

Allowanswerssuchas3.2×10/0.032/3.15×10/0.0315(mol).

–2

n(ICl)2×0.0316/0.0632/6.32×10(mol);

–2–2

Allowanswerssuchas6.4×10/0.064/6.3×10/0.063(mol).

m(ICl)(0.0632=×162.35)10.3(g);[3]

Allowanswersinrange10.2to10.4(g).

Award[3]forcorrectfinalanswer.

⎛8.60⎞

(iii)⎜10.3×100⎟83.5%;[1]

⎝⎠

Allowanswersintherangeof82.5to84.5%.

(iv)negative/–/minus/0;