Thermochemistry

Question 1

describe exothermic and movement of heat

Answer 1

it is when heat is released/ decreases + when enthalpy change is negaitve

Question 2

describe endothermic and movement of heat

Answer 2

It is when heat is absorbed/ increases + when enthalpy change is positive. It breaks attractions

Question 3

calculate energy change ( kj) - given m and M

Answer 3

1) Find n with given m and M
2) Find how much 1 mol of _ gives out by dividing it by total change.
3) Times n with 1 mol of energy to cancel the mol and just get kj

Question 4

calculate mass needed to release energy - given M only

Answer 4

1) Find N to find M
2) Using kj they give plus change in enthalpy kjmol -> divide ( ethalpy over the given) to find n (mol)
3) Make it m = n x M and sub to solve for m