Science
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- Created by: izithornley
- Created on: 18-06-17 10:56
Diffusion - what is it?
Diffusion is where soild molecules spread from a high concentration to a low concentration.It happens when particals are free to move.
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Osmosis - what is it?
Osmosis is where water molecules move from a high to love concentration.
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Idenpendant variable
The thing you change
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Dependant variable
Thing you measure
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Control variable
Things you keep the same.
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Difference between food web and food chain?
A food chain is a simple circuit of an animals diet system and a web contains many indivudual food chains to create a 'web'.
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Pyramid of biomass
The order in which a food chain is developed. The mass is which determines the size of the block not which order it goes.
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BIomass
A weight of an amount of living organisms.
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Effeciency
Useful energy/total energy = efficency
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Vaccine
When a small amount of a dead cell of diease is injected into the body.
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Who recognised the idea of a vaccine?
Edward jenner - with the smallpox and cowpox investigation 1749.
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Antigen
A protien on the surface of a pathogen that the antibodies recognise to destroy.
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Antitoxins
When the body forms a blood protien to either kill or prevent a toxin formed by a pathogen.
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Antibodies
A blood protien that forms when a pathogen is entered into the body to destroy a specific antigen.
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Pathogens
A micro-organism that can cause dieases
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3 stages of clinical trials
1) healthy voulenteers 2) 100-250 patients 3)500 patients.The clinical trials are used before a drug gets licenced to check its safe.
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Heard immunity
If everyone but one person has a vaccine that one person is very isolated from getting the diease.
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4 things a drug has to follow
Effective- treats the problem. Safe - doesnt give more side effects or problems. Stable- can be stored and used over a period of time. Digested well- goes in, through and out the body successfully.
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Placebo
When you're given a fake drug
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Double blind trial
When the patient nor dovtor know if they're taking the real or fake drug
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3 ways to prevent spread of bacteria
Antiseptic wipe (chemical to clean the skin), antibiotics (drug to kill bacteria in the body) or disinfectant (chemial to clean surfaces)
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What do antibiotics do?
kill or prevent a bacterial infection.
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Malaria
A protist, it can be prevented by bug killer or antimarlarial tablets. Malaria is spread from infected mosquitoes.
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Athletes foot
A form of fungi, caused by damp, warm areas of the body where fungi is most attracted to. You can prevent it by making sure to dry your feet properly, mainly inbetween your toes or wear breathable shoes to reduce moistness
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HIV
A virus caught from an insemination to the body such as sex or needles. To prevent HIV use a selection of contraception such as a condom or coil, these reduce risk of spread.
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Salmonella
A from of bacteria caused useally by uncooked food (food poisoning) a way to prevent this is to not eat raw meats or eggs as they contain the bacterium.
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Rose blackspot
A fungi it is caused by a fungus (diplocarpon rosae) to prevent this, dont keep plants to moist especially in humid weather
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Phagocytes
A type of white blood cell that eats the pathogen.
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Pathosome
Bubble used to hold the pathogen
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Nucleus
The genetics of the cell, its DNA
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noble gases
a full outer shell of electrons
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what is there in a atom?
protons, nutrons and electron
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neutralisation reaction
when alkalis and acids react together they will NEUTRALISE each other
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alkali
have a PH scale more than 7
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acids
have a PH scale less than 7
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pH
how acids and alkalis are measured as
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Ions
electrically charged particles when atoms lose or gain electrons
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Neutralisation
pH scale 7 when the scale hits neutral= colour green. To neutralise a acid you have to add the amount of alkali that adds to 14.
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how to work out acids and salts
acid + base = salt + water
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atomic structure
made up from electron, protons neutrons.
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number values of a atoms structure
protons have the same value of a electron however the neutron is the value placed below the chemicals name taken from the number above.
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the atomic number
amount of protons found in a atom
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residue
the substance left once you've separated a mixture
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filtrate
the substance left once you've separated a mixture
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Other cards in this set
Card 2
Front
Osmosis - what is it?
Back
Osmosis is where water molecules move from a high to love concentration.
Card 3
Front
Idenpendant variable
Back
Card 4
Front
Dependant variable
Back
Card 5
Front
Control variable
Back
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