CAIE A-Level Chemistry 2.3.2 Balanced and Ionic Equations

Practise constructing molecular and net ionic equations with conserved atoms, charge and appropriate state symbols.

Exam points

write correct reactant and product formulae before changing stoichiometric coefficients
balance every element and total charge, then add state symbols from the reaction context
remove unchanged spectator ions to obtain the net ionic equation without cancelling reacting species

[Maximum number: 1]

Sucrose is a white crystalline solid, $\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}$ . In reaction Z, sucrose reacts with water in the presence of a catalyst, aqueous hydrochloric acid, to form glucose and fructose.

reaction Z

Write the equation for the complete combustion of sucrose.

The enthalpy change of reaction $\mathbf{Z}, \Delta H_{r}$ , can be calculated using the enthalpy change of combustion data given in the table.

Table for Question 2.3.2—Balanced and ionic equations question 1 — CAIE A-Level Chemistry AS

$\mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11}+12 \mathrm{O}_{2} \rightarrow 12 \mathrm{CO}_{2}+11 \mathrm{H}_{2} \mathrm{O}$

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2.3.2—Balanced and ionic equations question 1