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Introducing chemical reactions

Introducing chemical reactions

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Question 30

Oxygen reacts with 2.00 g of calcium. 2.80 g of calcium oxide forms.

2Ca+O2→2CaO 2\text{Ca} + \text{O}_2 \rightarrow 2\text{CaO} 2Ca+O2​→2CaO

What mass of oxygen is used in this reaction?

A

0.40 g0.40\text{ g}0.40 g

B

0.80 g0.80\text{ g}0.80 g

C

1.20 g1.20\text{ g}1.20 g

D

4.80 g4.80\text{ g}4.80 g

Markscheme

Introducing chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /Introducing chemical reactions

55 exam-style questions on OCR GCSE Chemistry Introducing chemical reactions. Each one has a worked solution and a mark scheme showing where the marks go.

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