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Tutor HuntTest QuestionsChemistry QuestionsYear 10 Chemistry Questions

 

The Energy Change Of Reactions (ht Only) (GCSE Chemistry)

The following is a GCSE Chemistry test covering 'The Energy Change Of Reactions (ht Only)' from the broader topic Energy Changes. The test is geared towards the AQA exam board style syllabus.
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In bond-energy calculations for the reaction H2 + Cl2 ? 2HCl, if H—H = 436 kJ mol-1, Cl—Cl = 346 kJ mol-1 and H—Cl = 432 kJ mol-1, what is ?H (in kJ mol-1)?
Which reaction profile corresponds to an exothermic reaction?
Which practical step will most improve accuracy when measuring small temperature changes in reaction calorimetry?
In a calorimetry experiment you heat 100 g of water by 5.0 °C. Using c = 4.18 J g-1 °C-1, what is the heat absorbed by the water (in J)?
Which unit is most appropriate for standard enthalpy changes reported in data tables?
Which statement is true about standard enthalpies of formation?
When using bond energies, why are calculated ?H values sometimes different from experimental ?H values?
Which of the following best explains why increasing temperature usually increases reaction rate?
In a simple calorimetry example, burning 2.00 g of fuel A releases 5000 J. What energy per gram does fuel A release?
Which change will directly reduce the activation energy required for a reaction?
Which methodological change will reduce heat lost to the environment during a temperature-change experiment?