AP Chemistry · Topic 1.4

Composition of Mixtures Practice

Part of Atomic Structure and Properties.(SPQ-2.B)

Practice questions

2

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Sample questions

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Sample 1difficulty 1/5
$A student determines the formula of a hydrate of CuSO4 (M=159.6 g/mol). Mass of empty crucible = 25.124 g. Crucible + hydrate = 27.624 g. The crucible is heated strongly until the blue color turns white, then cooled in a desiccator and reweighed: 26.724 g. Heating is repeated until constant mass is reached.$
$What is the formula of the hydrate?$
- A
  $CuSO4 . 2 H2O$
- B
  $CuSO4 . 7 H2O$
- C
  $CuSO4 . 5 H2O$
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- D
  $CuSO4 . H2O$
Why
$mass anhydrous CuSO4 = 1.600 g; mol = 0.01003. mass H2O lost = 0.900 g; mol = 0.04994. ratio = 4.98 ~ 5 -> CuSO4 . 5 H2O.$
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Sample 2difficulty 1/5
$Which is a pure substance?$
- A
  $Brass$
- B
  $Air$
- C
  $Salt water$
- D
  $Distilled water (H₂O)$
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Why
$Pure substance = single compound or element. The others are mixtures (homogeneous).$
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