Balancing equations, types — combination, decomposition, displacement, redox.
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Q1 · Chemical Reactions and Equations · EASY
When magnesium ribbon is burnt in air, it combines with oxygen to form magnesium oxide. The balanced chemical equation is: 2Mg + O2 → 2MgO. What type of chemical reaction is this?
Q2 · Chemical Reactions and Equations · MEDIUM
Consider the following reaction: Fe2O3 + 2Al → Al2O3 + 2Fe. In this thermite reaction, aluminium reduces iron(III) oxide to iron. Which statement correctly describes this reaction?
Q3 · Chemical Reactions and Equations · HARD
In a chemical reaction, 5.6 g of iron reacts completely with dilute sulphuric acid according to the equation: Fe + H2SO4 → FeSO4 + H2. If the atomic mass of Fe is 56 u, what mass of hydrogen gas (H2, molecular mass 2 u) will be produced?
Q4 · Chemical Reactions and Equations · MEDIUM
When a magnesium ribbon is burnt in air, a white powder is formed. What type of chemical reaction is this?
Q5 · Chemical Reactions and Equations · MEDIUM
When magnesium ribbon burns in air, it combines with oxygen to form magnesium oxide. What type of reaction is this?