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science revisison

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  • Created on: 09-01-11 18:51
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Jessica Panayiotou
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Alcohol + acid -----> Ester +water
The volatility of perfume can be explained by the kinetic theory:
During evaporation, particles escape from the liquid into the air
Only the particles with lots of energy can escape the attraction of the particle in the liquid to evaporate
In perfume the attraction between the particles are weak which means the particle do not need a lot of
energy to escape.
The nail varnish is insoluble in water, but is soluble in nail varnish remover.
The nail varnish is solute because it dissolves in the solvent in the nail varnish remover.
The forms a solution which does no separate out.
Menstrual cycle
The two hormones which are involved are called:
Oestrogen Proeostrogen
Oestrogen causes the lining of the uterus to thicken and re grow blood vessels
Proeostrogen is maintaining the lining of the uterus. A fall in Proeostrogen level triggers menstruation.
DNA can easily change. These are called mutations, a mutation is:
Change in sequence of bases
Removal of one or more bases
Addition of one or more bases
There can also be a change in function:
The protein that the gene code is for is changed
The eye
Lens: focuses light on retina
Retina: contains receptor cells which are sensitive to light
Cornea: refracts light
Iris: coloured part, muscle
Some problems with the eye are:
Long-sightedness ­ convex lenses
Short- sightedness ­concave lenses
Red and green colour blindness
Lens: flexible bag of clear fluid
Surrounded by cilliary muscles
Cilliary muscles change the shape of the lens
Suspensory ligaments: connect lens to cilliary muscles
Incomplete combustion

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Jessica Panayiotou
This is when there is not enough oxygen and carbon monoxide is produce.
Methane+ oxygen ---> carbon monoxide + water
Monomers make polymers
The reaction to make polymers is called polymerisation
Addition polymerisation: many unsaturated molecules form large saturated molecules
Saturated : it does not contain a double bond (alkane)
Unsaturated: contains a double bond (alkene)
Fruit is wrapped in film with tiny holes, oxygen can enter to keep the food fresher for longer.…read more

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Jessica Panayiotou
p-waves s-waves
Longitudinal Transverse
Travel through solids and liquid Travels only through solids
Amplitude: maximum disturbance caused by the wave Frequency: the
number of complete waves that pass through a point in one second
Different versions of the same gene
Reflection & refraction
-…read more


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