OCR Alevel Chemistry A
Chemistry
Alevel chemistry flashcards for OCR A. All modules and chapters for year 1 and year 2
Sample Data
| Front | State and explain the trend in reactivity down group 7. |
| Back | Trend in reactivity of halogens:The reactivity of halogens decreases down the groupAlthough the nuclear charge of the halogen atom increases, the atomic radius and the amount of shielding also increase.This means that overall there is a smaller nuclear attraction on the electron being gained and therefore it is more difficult for the atom to gain the electron and be reduced
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| Front | How do catalysts influence energy consumption and the effect on the environment? |
| Back | Energy consumption and the effect on the environment"Rate increased using catalyst instead of heat or high pressureReduced energy inputLikely to reduce fosisl fuel use - cutting down of CO2 emissions linked to global warming |
| Front | What is ∆cHᶿ? |
| Back | Standard enthalpy change of combustion - enthalpy change that takes place when one mole of a substance reacts completely with oxygen under standard conditions, with all reactants and products in their standard state
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