2.1

Question 1

What is the principle of the conservation of energy?

Answer 1

Energy cannot be created or destroyed, only transformed from one form to another. Thus the sum of energy is constant

Question 2

What is exothermic?

Answer 2

-Give out energy
-Delta H is negative

Question 3

What is endothermic?

Answer 3

-Takes in energy
-Delta H is positive

Question 4

What is Hess’s law?

Answer 4

If a reaction can occur by more than one route, the total energy change for the reaction is independent of the route taken

Question 5

What is the standard enthalpy change of formation?

Answer 5

The enthalpy change when one mole of a substance in its standard state is formed from elements in their standard state under standard conditions

Question 6

What is the standard enthalpy change of combustion?

Answer 6

The enthalpy change when one mole of substance in its standard state completely burnt in Oxygen to form products in their standard states under standard conditions

Question 7

What is the equation for Heat change?

Answer 7

q=mct

Question 8

What is the equation for thermal energy?

Answer 8

-(mcT/n)

Question 9

What are the units in -(mcT/n)

Answer 9

m=mass of substance absorbing heat (water)
c=constant specific heat capacity
T= temperature change
n=moles