A sparkler contains magnesium powder. When the sparkler is lit, the magnesium burns in oxygen from the air with a bright white light. A white powder forms.
Name the white powder that forms.
Write the word equation for the reaction.
The white powder contains Mg2+\mathrm{Mg^{2+}}Mg2+ ions and O2−\mathrm{O^{2-}}O2− ions. Give the formula of the white powder.
Balance the equation for the reaction: Mg(s)+O2(g)→MgO(s)\mathrm{Mg(s)} + \mathrm{O_{2}(g)} \rightarrow \mathrm{MgO(s)}Mg(s)+O2(g)→MgO(s)
State what the state symbol (g) means.
Sparklers also contain iron. Iron burns to form an iron oxide with the formula Fe3O4\mathrm{Fe_{3}O_{4}}Fe3O4. Give the total number of atoms shown in the formula Fe3O4\mathrm{Fe_{3}O_{4}}Fe3O4.
230 exam-style questions on Edexcel GCSE Chemistry 1.1 Formulae, equations and hazards, covering 1.1.1 Formulae, word and balanced equations, 1.1.2 Balanced ionic equations, and 1.1.3 Hazard symbols and risk in practical work. Each one has a worked solution and a mark scheme showing where the marks go.