Edexcel A-Level Chemistry AS 6.4 The Definition of Standard Enthalpy Change of I Reaction Rh Ii Formation Fh Iii Combustion Ch Iv Neutralisation Questions

Use marked Edexcel IAL Chemistry questions to identify formation, combustion, neutralisation and atomisation definitions, one-mole equations and standard states.

Exam points

Select formation equations that produce exactly one mole from elements in standard states.
Define combustion, neutralisation or atomisation through the required one-mole change.
Explain why an element in its standard state has zero standard formation enthalpy.

[Maximum number: 2]

This question is about sodium hydroxide.

State what is meant by standard enthalpy change of neutralisation, $\Delta_{\text {neut }} H^{\ominus}$ .

An answer that makes reference to the following points:

- heat energy released under standard conditions (1)

- (when) 1 mol of water is produced (by the reaction of (1) acid with alkali)

Allow enthalpy change under standard conditions
Allow for standard conditions $1 \mathrm{~atm} / 1(.01) \times 10^{5} \mathrm{~Pa}$
and a stated temperature / $298 \mathrm{~K} / 25^{\circ} \mathrm{C}$
Ignore standard states
Do not award required

(2)

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Edexcel A-Level Chemistry AS 6.4 The Definition of Standard Enthalpy Change of I Reaction Rh Ii Formation Fh Iii Combustion Ch Iv Neutralisation Questions question 1