Unit 5 Applied science level 3 BTEC
Chemistry Exam Questions and Answers
chemical energy - - -
correct answer ✅the energy required to break or make bonds
exothermic reaction - - -
correct answer ✅A reaction that releases more energy in the form
of heat
what is the enthalpy change of an exothermic reaction - - -
correct answer ✅negative
endothermic reaction - - -
correct answer ✅A reaction in which more energy is absorbed
what is the enthalpy charge of an endothermic reaction - - -
correct answer ✅positive
what will happen to the enthalpy diagrams when a catalyst is added
---
correct answer ✅less activation energy will be required during this
reaction
, Unit 5 Applied science level 3 BTEC
Chemistry Exam Questions and Answers
enthalpy change - - -
correct answer ✅the change n eat energy at a constant pressure
Enthalpy change of formation - - -
correct answer ✅when one mole of a compound is formed from
its element under standard conditions
enthalpy change of combustion - - -
correct answer ✅when one mole of a substance is burnt in oxygen
under standard conditions
enthalpy change of hydration - - -
correct answer ✅when one mole of a gaseous ion are dissolved in
water to make an infinite dilute solution
what are the three standard conditions - - -
correct answer ✅temperature
concentration
pressure
Chemistry Exam Questions and Answers
chemical energy - - -
correct answer ✅the energy required to break or make bonds
exothermic reaction - - -
correct answer ✅A reaction that releases more energy in the form
of heat
what is the enthalpy change of an exothermic reaction - - -
correct answer ✅negative
endothermic reaction - - -
correct answer ✅A reaction in which more energy is absorbed
what is the enthalpy charge of an endothermic reaction - - -
correct answer ✅positive
what will happen to the enthalpy diagrams when a catalyst is added
---
correct answer ✅less activation energy will be required during this
reaction
, Unit 5 Applied science level 3 BTEC
Chemistry Exam Questions and Answers
enthalpy change - - -
correct answer ✅the change n eat energy at a constant pressure
Enthalpy change of formation - - -
correct answer ✅when one mole of a compound is formed from
its element under standard conditions
enthalpy change of combustion - - -
correct answer ✅when one mole of a substance is burnt in oxygen
under standard conditions
enthalpy change of hydration - - -
correct answer ✅when one mole of a gaseous ion are dissolved in
water to make an infinite dilute solution
what are the three standard conditions - - -
correct answer ✅temperature
concentration
pressure
