Specific heat capacity

Question 1

Define: specific heat capacity

Answer 1

amount of energy (usually in J) required to increase the temperature of a specific quantity of a substance (usually g) by 1 degree celcius.

Question 2

SHC reflects

Answer 2

type of bonds in a substance

Question 3

the higher,

Answer 3

the more effectively it stores heat energy

Question 4

shc of water?

Answer 4

4.18 J g-1*C-1 (quite high due to ability to form h bonds)

Question 5

shc formula?

Answer 5

q=C x m x ∆T
	q = amount of heat energy (J)
	C = standard heat capacity
	M = mas (g)
	∆T=change in temp (℃)

Question 6

how are heat of combustion of fuels determined experimentally?

Answer 6

Spirit burner, containing a fuel, is burned (chemical -> thermal energy).

Thermal energy heats water. q is calculated by C (shc), m (mL which equals g of water) and delta T (change in temp)

Figure out mole of fuel by n= m/M; then sub into energy released (CONVERT TO KJ) = n x delta H

Question 7

assumption made regarding energy?

Answer 7

all chemical energy is converted to thermal energy - not the case, so hoc values are approximate