CAIE IGCSE Chemistry 3.1.7 Construct Symbol Equations with State Questions

Balance reaction equations and write ionic equations with accurate coefficients and state symbols.

Exam points

balance chemical equations by conserving atoms
write ionic equations for precipitation reactions
include state symbols in ionic and symbol equations
check coefficients for combustion and redox equations
identify balanced equations from reaction formulae

[Maximum number: 3]

Lead(II) bromide, $\mathrm{PbBr}_{2}$ , is an insoluble salt and is made by precipitation.

Write an ionic equation for the precipitation reaction which produces lead(II) bromide. Include state symbols.

$\mathrm{Pb}^{2+}(\mathrm{aq})+2 \mathrm{Br}(\mathrm{aq}) \rightarrow \mathrm{PbBr}_{2}(\mathrm{~s})$

M1 $\mathrm{PbBr}_{2}$ as the only product (1)

M2 $\mathrm{Pb}^{2+}+2 \mathrm{Br}$ as the only reactants in a balanced equation(1)

M3 state symbols
$(a q)+(a q) \rightarrow(s)(1)$

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CAIE IGCSE Chemistry 3.1.7 Construct Symbol Equations with State Questions question 1