Chemical reactions Flashcards
(17 cards)
what’s a physical change
only change of matter and the mass stays the same
what’s a reactant
chemicals joined together to form new substances
what’s a product
new chemical formed in a chemical reaction
irreversible
permanent change
reversible
can be changed back to original state
what’s decompse
a reaction in which one substance splits into 2 or more products
which chemical releases energy when reacting with oxygen
fuel
which compound only contains hydrogen and carbon
hydrocarbon
what’s oxidation
having oxygen added to something
what’s a explosive reaction
a cr that happens very fast giving of lots of energy and making lots of gas
what’s neutralisation
when an acid cancels out an alkali
explain displacement reaction
its when a more reactive element displaces a less reactive element from its compound
e.g: ZINC+ COPPER SULPHATE ____ ZINC SULPHATE+COPPER
when do chemical reactions occur
when reactants are mixed/combined together
when energy is supplied continuously to reactants/chemicals
when a little bit of energy is supplied to reactants/chemicals
how to test for hygrogen
A lighted wooden splint makes a popping sound in a test tube of hydrogen
how to test for carbon dioxide
it turns lime water cloudy
puts out lit splint
how to test for oxygen
re-light a glowing splint
what can be used to speed up a reaction
Catalysts speed up reactions without being used up
