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Sedimentary rocks often contain fossils, have layers, and are easily eroded compared to other types of rock.
carbon monoxidecarbon dioxideoxygen
Here is the full word equation:
animals breathingphotosynthesis in plantsgases from volcanoes
This early atmosphere would have been mostly carbon dioxide with very little oxygen.
"... carbon dioxide.""... oxygen.""... hydrogen."
Oxygen causes oxidisation.
Cracking produces smaller, more useful hydrocarbon molecules.
It's made when propene undergoes polymerisation and is also called polypropylene.
Cations are positively charged.
It contains more protons than electrons.It contains the same number of electrons and protons.It contains the same number of electrons and neutrons.It contains more neutrons than electrons.
Protons have +1 relative charge, electrons have -1, so when you have the same number of each they cancel each other out.
sodium carbonatelead chloridemagnesium nitrate
Lead chloride's solubility in water is very low, so it's generally considered to be insoluble.
Simple molecular substances have low boiling and melting points, and don't conduct electricity.
It speeds up the rate of a reaction, but is not used up itself.It speeds up the rate of the reaction and is chemically changed during the process.
A catalyst doesn't undergo a permanent chemical change during the reaction.
The acid in vinegar slows food spoilage.
Calcium, Ca²⁺Lithium, Li⁺Sodium, Na⁺
Sodium produces a bright yellow flame in a flame test.
temperature = 200ºC, pressure = 200 atmospherestemperature = 450ºC, pressure = 200 atmospherestemperature = 450ºC, pressure = 450 atmospheres
The Haber process involves combining nitrogen and hydrogen at high temperature and pressure.
An iron catalyst is used to speed up the Haber process.
Can You Get Through This GCSE Chemistry Test?
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Kelly Oakes is science editor for BuzzFeed and is based in London.
Contact Kelly Oakes at email@example.com.
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