Chemical Compounds and Equations — O/L Science

How do I practise Chemical Compounds and Equations?

1 question with a worked solution · 5 marks

1. 2022 · Paper II · 5 marks
   Question 4 states that magnesium ribbon burns in oxygen to form magnesium oxide. It asks you to write the balanced chemical equation, to classify the reaction among combination, decomposition, displacement and double displacement, and to name two signs that a chemical reaction has occurred in that experiment.
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   (i) 2Mg + O₂ → 2MgO (ii) Combination (synthesis) reaction — two substances combine to form one product. (iii) Bright white light / flame produced; white ash (MgO) forms (any two of: light, heat, new substance formed, colour change accepted).
   Source: Department of Examinations, Sri Lanka — G.C.E. O/L Science 2022, Paper II, Question 4 · https://doenets.lk/pastpapers

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