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Everything about Science 8 - Coggle Diagram
Everything about Science 8
Unit 1
Human respiratory system
Respiration is a series of chemical reaction that happens inside every living cell.
Aerobic respiration is the most common type and it has to do something with air or more specifically oxygen
Aaerobic respiration doesn't use any air or oxygen.
The way air goes through our body is through the respiratory system.
Check the thing in the book
Gas Exchange
Air sacs as are 'balls' in the lungs. They are basically a place where air diffuses.
They are surrounded by tiny blood vessels called capillaries.
In the capillaries the oxygen moving in diffuses into the blood and the carbon dioxide comes out and move out of it.
When oxygen gets into the blood they dissovle and combine with the haemoglobin
Breathing
Breathe in
The intercostal muscles between the ribs contract or get shorter.
The muscles in the diaphragm contract and pulls the diaphragm donwnwards.
This two movements help expand the chest helping and making more air come in.
When volume increases pressure on the chest and lungs decreases
Breathe out
Respiration
Blood
Unit 2
Unit 3
Unit 4
Unit 5
Unit 6
Unit 7
Unit 8
Exothermic Reaction
Burning
Burning is a chemical reaction which a substance combine with oxygen.
The substance that combines with oxygen is called fuel.
Combustion is another term for burning and it needs a spark to ignite.
Exothermic reaction is when thermal energy is released into its surroundings
It can happen with water, acid and other substances.
Endothermic reactions
When thermal energy is absorbed from its surroundings.
sodium hydrogencarbonate + citric acid --> sodium citrite + water + carbon dioxide
Reactions of metals with oxygen
Some metals are very reactive to it like sodium and could potential be dangerous
Some rust like iron and oxygen
The process of an object combining with oxygen is called oxidization.
Reactions of metals with water
Some are really reactive with it like potassium or sodium.
Some can rust like iron and other metals
This is because oxygen and water and iron react together in oxidization.
Reactions of metals with dilute acids
metal + acid = salt + hydrogen
Some metals cannot react in acid
Only dilute acid
Unit 9
Magnetic fields
The Earth as a giant magnet
Electromagnets