BTEC Unit 5 – Chemistry Questions Graded A+
Enthalpy of combustion (∆Hc) - ANSWER-The enthalpy change that occurs when one mole of a substance is burnt completely in oxygen under standard conditions Enthalpy of Formation (∆Hf) - ANSWER-The enthalpy change that occurs when one mole of a substance is formed from its elements in their standard states under standard conditions Enthalpy - ANSWER-The thermal energy stored in a chemical system. It is defined by: Enthalpy = Internal energy of the system + (pressure x volume) H = U + pV What is Hess' Law? - ANSWER-The enthalpy change is independent of the route taken Enthalpy of hydration (ΔHhyd) - ANSWER-The enthalpy change that occurs when one mole of gaseous ions is dissolved in water to make an infinitely dilute solution under standard conditions What factors affect the enthalpy of hydration? - ANSWER-Size of the ion Charge of the ion Define the term, amphoteric - ANSWER-Can act as an acid and a base Acid - ANSWER-a compound that contains one or more hydrogen atoms and produces hydrogen ions when dissolved in water
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- BTEC Unit 5
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- BTEC Unit 5
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- June 29, 2023
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- btec unit 5
- btec unit 5 – chemistry
- enthalpy
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btec unit 5 – chemistry questions graded a
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enthalpy of combustion ∆hc
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enthalpy of formation ∆hf
