Chemical reactions Flashcards
(18 cards)
What are the three things needed for combustion?
Heat, oxygen and fuel
Word equation for combustion
Hydrocarbon + oxygen>carbon dioxide+ water+(energy)
What is oxidation
When a substance reacts with oxygen
Word equation for metals (oxidation)
Metal+ oxygen>metal-oxide
What is the is decomposition
A substance breaks down when heated
Is thermal decomposition a physical or chemical change
It is a chemical change even though it is not reacting with something else
Word equation for metal carbonates (thermal decomposition)
Metal carbonate > metal oxide+ carbon dioxide
What is a exothermic reaction
A reaction which releases energy to the surroundings through heat
Examples of exothermic reactions
Combustion, oxidation , some neutralisation
What is an endothermic reaction
Brings heat energy in from the surroundings
Endothermic reactions examples
Thermal decomposition
What is the reactivity series
Potassium, sodium, calcium, magnesium, aluminium, zinc, iron, led, copper, silver, gold
What is a displacement reaction
A more reactive metal displace( kick out) a less reactive metal from its compound.
How are metals naturally found
They are found as ores ( rocks containing metals and metal oxides )
Where is metal found in the reactivity series
Between aluminium and zinc
What metals can be removed from oxides with carbon
Anything less reactive / including zinc
Word equation for metal extraction + carbon
Metal oxide+ carbon > metal + carbon dioxide
What is combustion
Burning
