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2.1 Purity and separating mixtures

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Question 4

A school technician has four sealed bottles. The label on each bottle describes the particles inside.

BottleLabel
PCarbon atoms and oxygen atoms, chemically bonded together in identical molecules
QNitrogen molecules and oxygen molecules, not chemically bonded to each other
RCopper atoms and zinc atoms, not chemically bonded to each other
SWater molecules and dissolved sodium chloride, not chemically bonded to each other

Which bottle holds a pure substance, in the chemical sense?

[1]
A

Bottle P

B

Bottle Q

C

Bottle R

D

Bottle S

Markscheme

2.1 Purity and separating mixtures Questions

  1. GCSE
  2. /Chemistry
  3. /2.1 Purity and separating mixtures

102 exam-style questions on OCR GCSE Chemistry 2.1 Purity and separating mixtures, covering 2.1.1 Pure substances and melting point data, 2.1.2 Relative formula mass and empirical formula, 2.1.3 Formulations as useful mixtures, 2.1.4 Techniques for separating mixtures, and 2.1.5 Chromatography and Rf values. Each one has a worked solution and a mark scheme showing where the marks go.

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