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4.1 Predicting chemical reactions

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Question 20

A chemist is choosing elements for a reaction. The table shows the available elements.

ElementGroupNumber of occupied electron shells
Lithium, Li12
Potassium, K14
Oxygen, O62
Sulfur, S63

All reactions take place under the same conditions.

The chemist wants the reaction that is predicted to be least vigorous. Which pair of elements should be chosen, and what is the formula of the product?

[1]
A

Potassium and oxygen; formula K2O\mathrm{K_2O}K2​O

B

Lithium and sulfur; formula Li2S\mathrm{Li_2S}Li2​S

C

Lithium and oxygen; formula Li2O\mathrm{Li_2O}Li2​O

D

Potassium and sulfur; formula K2S\mathrm{K_2S}K2​S

Markscheme

4.1 Predicting chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /4.1 Predicting chemical reactions

113 exam-style questions on OCR GCSE Chemistry 4.1 Predicting chemical reactions, covering 4.1.1 Properties and trends in Groups 1, 7 and 0, 4.1.2 Properties of the transition metals, 4.1.3 Reactivity predicted from position in the Periodic Table, and 4.1.4 Reactivity of metals and the reactivity series. Each one has a worked solution and a mark scheme showing where the marks go.

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