Unit 2B assignment of applied science level 3 extended national diploma. achieved overall grade merit in unit with 3 assignments achieving distinctions. Overall course grade D*D*D.
,AIM:
Undertake calorimetry to study cooling curves.
To ensure thermometers are calibrated and that chemicals are safety checked.
Demonstrate your ability to use a calorimeter and associated equipment to obtain
data to determine, analyse, and evaluate the rate of cooling of substances.
SAFETY:
Wear goggles during all practical work.
Boiling water could enter eyes and infect them.
Tie hair back and make sure nothing is in the way.
Paraffin wax is more hazardous than stearic acid.
Paraffin wax causes skin irritation, so avoid skin contact.
May cause damage to organs through repeated exposure.
To avoid risks:
Use smallest amounts as possible
Wear eye protection
Avoid skin contact
Prevent escape of vapour
Stearic acid:
May be harmful by inhalation or skin absorption.
May cause irritation.
Toxic if swallowed.
To avoid risks:
Wear goggles
Don’t inhale
Avoid skin contact
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, SCIENCE BACKGROUND:
Stearic acid:
It is obtained from fats and oils by the saponification of the triglycerides using boiling
water. It is a waxy solid and its formula is C17H35CO2H.
Some Uses:
As food additive
Soaps, cosmetics, detergents.
Lubricants, softening and release agents
Properties:
Molar mass: 284.484 g/mol-1
Appearance: white solid
Melting point: 69°C
Boiling point: 361°C decomposes
Paraffin wax:
Paraffin wax is mostly found as white, odourless, tasteless, waxy solid with a typical
melting point at around 37°C.
It is an excellent electrical insulator, with a resistivity of between 10 13 and 1017 ohm metre.
Some Uses:
Candle-making
Wax craving
Coatings for waxed paper
Crayons
Properties:
Chemical formula: CnH2n+2
Appearance: white solid
Melting point: 37°C
Boiling point: >370°C
Thermometers:
A thermometer is a device used to measure temperature or temperature gradient.
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