AssalamuAlaiku

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Name: Syed Ahmed Khizar

Teacher: Sir Asif ImranCourse: TXCH-101Topic:

Presentation

Measurement Of Thermal Changes

Measurement Of Thermal Changes

Heat“Energy in Transit.”

“E” which trasfers from one body to another due to temperature difference.

Measurement Of Thermal Changes

Calorimetry

Calorie = Heat = Therm

Law Of Heat ExchangeAmount Of Heat

ReleasedAmount Of Heat

Absorbed=

Qreleased =

Qabsorbed

Q = mc△T

Q = nc△T

Q = c△T

Specific Heat

Molar Heat Capacity

Molar Heat Capacity

Heat Released or Absorbed By A Body:

Problem

For every process:

Every substance have d/f value of “c”.

Impossible for unknown substance.

ChemicalOr

Physical

Heat changes occur

Easy Solution

Do the process in water.

Why?Process Water

Qprocess = Qwater

But still

error

Another Problem

Environment

Solution

Open System M E

Close System M E

Isolated System M E

System

Calorimeter

Not a measuring instrument.Used to keep heat inside.

Container also absorb heat.

Another Problem

Qprocess = Qwater +

Qcontainer

Qprocess = Qwater +

Qcontainer

Qprocess = mwcw△T +

mccc△T

How to take reading?

1)Mc

2)Mw

3)Ti

4)Tf

Qprocess = mwcw(Tf-Ti) + mccc(Tf-Ti)

ReadingsBalance

Thermometer