Endothermic + Exothermic Reactions Flashcards
What is the name of a reaction that gives energy out?
A reaction that gives energy out, is called an exothermic reaction
What is the name of a reaction that takes energy in?
A reaction that takes energy in, is called an endothermic reaction
What is the rule of endothermic reactions, when they occur in the reverse way?
A reaction which is endothermic in one direction, is exothermic in the reverse direction
When an endothermic reaction occurs, is the enthalpy change of the reaction, positive or negative?
When an endothermic reaction occurs, the enthalpy change of reaction is positive
When an exothermic reaction occurs, is the enthalpy change of the reaction, positive or negative?
When an exothermic reaction occurs, the enthalpy change of reaction is negative
What does the △ in the enthalpy change of reaction mean?
△ means the change
What does the H in the enthalpy change of reaction mean?
H means the enthalpy
What does the ⦵ in the enthalpy change of reaction mean?
⦵ means the reaction occurs in standard conditions
What are the standard conditions referred to by the symbol: ⦵
The standard conditions are 298K and 100kPa
Natural gas, methane, CH4, gives out 890kJ when one mole is burnt completely.
CH4 (g) + 2O2 (g) = CO2 (g) + 2H2O (l)
Calculate how much heat would be given out when 8g of methane is burnt completely
1 mole = 890kJ
0.5 mole = 445kJ
