Y10 Module 6 Key Words

carbohydrates
substances that are compounds of carbon, hydrogen and oxygen.
caustic soda
the common name for sodium hydroxide
citric acid
a weak acid found naturally in oranges and lemons.
combustion
burning
crust
the rocky outer layer of the earth
decomposition
a reaction in which a substance breaks down into two or more new substances
dehydrated
a dehydrated substance has had its water removed
dilute
a dilute substance is mixed with water to make it less concentrated
downward delivery
the method of collecting dense gases in a container
excess
enough of a substance to react completely and have some left over ate the end of the reaction
flammable
able to burn
gas syringe
a syringe, usually made of glass, used to collect gases in the labrotory
hydrated
a hydrated substance contains water molecules
hydration
a reaction in which water is added to a substance
insoluble
does not dissolve in water
insoluble salt
a salt that does not dissolve in water
molecule
a particle made up from atoms joined together with chemical bonds
neutralisation
the recation between an acid and an alkalis (or other base) to forma neutral solution
ore
a compund of a metal found naturally from which metals can be extracted
oxidisation
a chemical reaction in which oxygen is added to a substance
oxidised
a substance that has had oxygen added to it in a chemical reaction is said to be oxidised
oxidising agent
a chemical that can cause an oxidisation reaction
precipitate
the insoluble solid formed in a precipitation reaction
precipitation reaction
a reaction in which a solid is formed when two solutions are mixed together
raw material
a starting substance for the manufaction of a particular chemical
reactive
the more reactive a sunstance is the more likely it will react with other subtances
reactivity series
a list of metals or non metals, in the order of their reactivity
reduced
a substance that has had oxygen taken from it in a chemical reaction is said to be reduced
reduction
a chemical reaction in which oxygen is taken away from a substance
salt
one of the substances produced in a neutralisation reaction
soluble
dissolves in water to make a solution
soluble salt
a salt that dissolves in water
stable
a stable compound needs a lot of energy to break it down into simpler substances
thermal decomposition
a reaction in which a substance is broken down using heat energy
uncombined
not joined together
upward delivery
the method of collecting gases, that are less dense then air, in an upside-down container.s

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