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Chemical Reactions: Combination Reactions
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Chemical Reactions: Combination Reactions
A combination reaction joins two or more reactants to form one product. Use the evidence and equations below to investigate how to recognise, predict and balance these reactions. Write state symbols where you can.
1.A student writes: magnesium + oxygen → magnesium oxide. Explain why this is a combination reaction, using the number of reactants and products in your explanation.
2.Write a balanced symbol equation, including state symbols, for magnesium reacting with oxygen gas to form solid magnesium oxide.
3.In your balanced equation for magnesium reacting with oxygen, explain what the coefficient in front of magnesium oxide tells you. Do not confuse a coefficient with a subscript.
4.Calcium reacts with oxygen to form calcium oxide. Write the correct formula for the product, then give the balanced symbol equation with state symbols.
5.Which equation shows a combination reaction?
- A. 2H₂O₂ → 2H₂O + O₂
- B. H₂ + Cl₂ → 2HCl
- C. Zn + 2HCl → ZnCl₂ + H₂
- D. CH₄ + 2O₂ → CO₂ + 2H₂O
6.Hydrogen gas combines with nitrogen gas to make ammonia, NH₃. Balance the equation: N₂(g) + H₂(g) → NH₃(g).
7.Rusting can be modelled simply as iron combining with oxygen to form iron(III) oxide, Fe₂O₃. Write and balance this equation. This simplified model leaves out water and other conditions involved in real rusting.
8.A classmate claims that Mg + O₂ → MgO is balanced because both sides contain magnesium and oxygen. Explain what is wrong with the claim by comparing the number of each type of atom on both sides.
9.True or false: a combination reaction must always have exactly two reactants. Correct the statement if it is false.
TrueFalse
10.When magnesium burns, it gives off intense light and forms a white solid. State one observation that suggests a chemical reaction occurred, and explain why the white solid is evidence of product formation.
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