Calorimetry

Question 1

Why is it hard to get an accurate result in a calorimetry experiment?

Answer 1

Always lose heat to surroundings
Incomplete combustion

Question 2

How do you find out the enthalpy of combustion of a flammable liquid?

Answer 2

Burn it inside a calorimeter

Question 3

Formula for calculating enthalpy change from calorimetry experiment

Answer 3

q = mcΔT

Question 4

q

Answer 4

Heat lost or gained
Same as enthalpy change if pressure is constant

Question 5

Unit of q

Answer 5

Joules

Question 6

m

Answer 6

Mass of water/ solution in calorimeter

Question 7

Unit of m

Answer 7

Grams

Question 8

c

Answer 8

Specific heat capacity of water

Question 9

ΔT

Answer 9

Change in temp of water/solution

Question 10

Unit of ΔT

Answer 10

Kelvin or celsius

Question 11

What does specific heat capacity of water mean?

Answer 11

Amount of heat energy needed to raise temp of 1g water by 1K

Question 12

How do you find the enthalpy change for a neutralisation reaction?

Answer 12

1) Add known volume of acid to insulated container & measure temp
2) Add known amount of alkali & record temp of mixture at regular intervals over period of time
3) Find temp change. Use it to calculate enthalpy change

Question 13

Improvements to calorimetry experiment

Answer 13

Stirring constantly
Heat mats