Slides in this set

Slide 1

Preview of page 1

Specific Heat Capacity…read more

Slide 2

Preview of page 2

· We are all familiar with energy labels on food
· We measure energy in joules, however when
we refer to food we talk about Calories
· 1 calorie = 4.2 joules
· How do we release the energy in food?
· Is it exothermic or endothermic?…read more

Slide 3

Preview of page 3

· Uses the changes in the temperature of water
to measure energy released by food or
chemical reactions
· For chemical reactions the reaction is carried
out in an insulated beaker or a bomb
calorimeter (heated with electric wire)
· The energy change for the reaction can be
precisely measured…read more

Slide 4

Preview of page 4

Specific Heat Capacity
· Is the amount of energy which is required to
raise the temperature of 1g of the substance
by 1°C
· The specific heat capacity of water is
4.2g-1°C-1…read more

Slide 5

Preview of page 5

Specific Heat Capacity
· Some other common specific heat capacity's
· Magnesium 1.02g-1°C-1
· Oxygen 0.918g-1°C-1
· Paraffin Wax 2.5g-1°C-1
· Ethanol 2.44g-1°C-1
· Copper 0.385g-1°C-1
· Concrete 0.88g-1°C-1…read more

Slide 6

Preview of page 6

· Energy change = mass x specific heat capacity
x change in temperature
· Question:
25cm3 of water in a test tube was heated by
burning cheesy wotsits under the tube. The
temperature of the water went up from 19°C to
· Using the equation calculate the amount of
energy in the wotsits.…read more


No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »