3a - energetics Flashcards
1
Q
what is an exothermic reaction?
A
a reaction that transfers energy to the surroundings
so the temperature of the surroundings increases
2
Q
whats an endothermic reaction?
A
a reaction that takes in energy from the surroundings so the temperature of the surroundings
decreases.
3
Q
how can change in heat content be deterined?
A
using a thermometer
4
Q
what is the law of conservation of energy?
A
energy cannot be created or destroyed, but can be transferred
5
Q
what is calorimetry?
A
a technique used to measure changes in enthalpy of chemical reactions
6
Q
what are the two types of calorimetry experiments
A
- enthalpy changes of reactions in a solution
- enthalpy changes of combustions
7
Q
what can a calorimeter be made of?
A
polystyrene cup
8
Q
how to find enthalpy change using a calorimeter
A
- a fixed volume of one reagent is added to the calorimeter and the initial temperature is taken with a thermometer
- an excess amount of the second reagent is added and the solution is stirred continuously.
9
Q
A
9
Q
A
