CAIE IGCSE Chemistry 10.3.9 Symbol Equation for Photosynthesis Questions

Work through real CAIE IGCSE Chemistry questions to balance the photosynthesis equation and identify glucose from incomplete symbol equations.

Exam points

write 6CO2 + 6H2O -> C6H12O6 + 6O2 as the balanced photosynthesis equation
use coefficients in incomplete equations to identify glucose or its empirical formula

[Maximum number: 1]

The incomplete equation for photosynthesis is shown.

w \mathrm{CO}_{2}+x \mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{P}+y \mathrm{O}_{2}

Compound P is a product of the reaction.

Which row describes the values of w, x and y and gives the empirical formula of compound P ?

values of w, x and y

empirical formula
of compound P

w, x and y are all the same

$\mathrm{CH}_{2} \mathrm{O}$

w, x and y are all the same

$\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}$

w and x are the same and both are greater than y

$\mathrm{CH}_{2} \mathrm{O}$

w and x are the same and both are greater than y

$\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}$

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