Science Revison
- Created by: superslowsniper
- Created on: 09-03-17 08:37
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- Science Revison
- Chemistry
- States of Matter
- The particles in solids, liquids and gases have different amounts of energy.
- They are arranged differently and move in different ways.
- The kinetic particle theory explains the properties of the different states of matter.
- The air is a mixture of gases. The amount of water vapour in the air varies from place to place, and day to day
- The kinetic particle theory explains the properties of the different states of matter.
- They are arranged differently and move in different ways.
- The particles in solids, liquids and gases have different amounts of energy.
- States of Matter
- Biology
- Effects of drugs on the body
- Stimulants and depressants affect the synapses between neurones in the nervous system
- Stimulants: cause more neurotransmitter molecules to diffuse across the synapse
- Some drugs are illegal, or must only be prescribed by a doctor
- Some prescription drugs are misused and taken for recreational use, rather than medical reasons
- Some drugs are illegal, or must only be prescribed by a doctor
- Effects of drugs on the body
- Physics
- Extra-Science
- Chemistry
- Types of waves
- Water waves and S waves are also transverse waves
- Physics
- Electricity Safety
- Electricity is a useful form of energy but it can also be very dangerous.
- Pushing metal objects into plug sockets
- Damaged or incorrectly wired plugs
- Touching frayed electrical cables
- Allowing water or wet objects to enter plug sockets or touch frayed cables
- Electricity is a useful form of energy but it can also be very dangerous.
- Pushing metal objects into plug sockets
- Damaged or incorrectly wired plugs
- Touching frayed electrical cables
- Allowing water or wet objects to enter plug sockets or touch frayed cables
- Allowing water or wet objects to enter plug sockets or touch frayed cables
- Touching frayed electrical cables
- Damaged or incorrectly wired plugs
- Pushing metal objects into plug sockets
- Electricity is a useful form of energy but it can also be very dangerous.
- Allowing water or wet objects to enter plug sockets or touch frayed cables
- Touching frayed electrical cables
- Damaged or incorrectly wired plugs
- Pushing metal objects into plug sockets
- There are lots of ways in which we can be electrocuted
- Long or overheating cables
- Electricity Safety
- There are lots of ways in which we can be electrocuted
- Long or overheating cables
- Long or overheating cables
- There are lots of ways in which we can be electrocuted
- Electricity Safety
- Long or overheating cables
- Electricity is a useful form of energy but it can also be very dangerous.
- Gases In Air
- For this reason, the proportions of the gases in the air are usually given for dry air
- Fractional distillation of air
- About 78% of the air is nitrogen and 21% is oxygen.
- These two gases can be separated by fractional distillation of liquid air
- Liquefying the air
- Air is filtered to remove dust, and then cooled in stages until it reaches -200*C
- At this temperature it is a liquid. The air has been liquefied
- Air is filtered to remove dust, and then cooled in stages until it reaches -200*C
- Liquefying the air
- These two gases can be separated by fractional distillation of liquid air
- About 78% of the air is nitrogen and 21% is oxygen.
- Fractional distillation of air
- For this reason, the proportions of the gases in the air are usually given for dry air
- The Universe
- Scientists have gathered a lot of evidence and information about the Universe.
- They have used their observations to develop a theory called the Big Bang.
- The theory states that about 13.7 billion years ago all the matter in the Universe was concentrated into a single incredibly tiny point
- This began to enlarge rapidly in a hot explosion, and it is still expanding today
- Scientists have also detected cosmic microwave background radiation or CMBR
- This is received from all parts of the Universe and is thought to be the heat left over from the original explosion
- Redshift
- You may have noticed that when an ambulance or police car goes past, its siren is high-pitched as it comes towards you, and then becomes low-pitched as it goes away
- This effect, where there is a change in frequency and wavelength, is called the Doppler effect
- It happens with any wave source that moves relative to an observer
- This happens with light, too, and is called 'red-shift'
- Our sun contains helium. We know this because there are black lines in the spectrum of the light from the Sun where helium has absorbed light
- These lines form the absorption spectrum for helium
- Our sun contains helium. We know this because there are black lines in the spectrum of the light from the Sun where helium has absorbed light
- This happens with light, too, and is called 'red-shift'
- It happens with any wave source that moves relative to an observer
- This effect, where there is a change in frequency and wavelength, is called the Doppler effect
- You may have noticed that when an ambulance or police car goes past, its siren is high-pitched as it comes towards you, and then becomes low-pitched as it goes away
- Redshift
- This is received from all parts of the Universe and is thought to be the heat left over from the original explosion
- Scientists have also detected cosmic microwave background radiation or CMBR
- This began to enlarge rapidly in a hot explosion, and it is still expanding today
- The theory states that about 13.7 billion years ago all the matter in the Universe was concentrated into a single incredibly tiny point
- They have used their observations to develop a theory called the Big Bang.
- Scientists have gathered a lot of evidence and information about the Universe.
- Diet
- The sources and main functions of the different components in a balanced diet are:
- Carbohydrates Proteins Lipids
- Too little food may cause starvation. Too much food, particularly fatty food, may cause obesity and coronary heart disease
- Vitamins are only needed in small amounts to maintain a healthy body
- A lack of vitamins in the diet leads to deficiency symptoms
- Vitamin C (ascorbic acid) is needed to help heal wounds and maintain healthy connective tissue (which gives support to other tissues and organs)
- A lack of vitamins in the diet leads to deficiency symptoms
- Vitamins are only needed in small amounts to maintain a healthy body
- Too little food may cause starvation. Too much food, particularly fatty food, may cause obesity and coronary heart disease
- Carbohydrates Proteins Lipids
- The sources and main functions of the different components in a balanced diet are:
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