Enthalpy Changes (OCR A-Level Chemistry A): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What does represent in a chemical reaction?
What does represent in a chemical reaction?
Change in heat energy of the system
In an exothermic reaction, what is the sign of ?
In an exothermic reaction, what is the sign of ?
Negative
What happens to the surroundings during an endothermic reaction?
What happens to the surroundings during an endothermic reaction?
Temperature falls
On an enthalpy profile diagram for an exothermic reaction, where are products positioned?
On an enthalpy profile diagram for an exothermic reaction, where are products positioned?
Lower energy level than reactants
What is activation energy ()?
What is activation energy ()?
Minimum energy for reaction to occur
What is the standard temperature used for enthalpy measurements?
What is the standard temperature used for enthalpy measurements?
298 K
How many moles of compound must form in a equation?
How many moles of compound must form in a equation?
Exactly one mole
What is for any element in its standard state?
What is for any element in its standard state?
0 kJ mol⁻¹
In , how many moles of substance must combust?
In , how many moles of substance must combust?
Exactly one mole
What is for strong acid + strong base?
What is for strong acid + strong base?
-57 kJ mol⁻¹