Different Types of Chemical Reactions (Part 1) Unit 2 Topic 3 Flashcards
What are the signs that a chemical reaction is taking place? (4)
Colour change
Formation of a precipitate
Gas production
Temperature change
What is an exothermic reaction?
What is an endothermic reaction?
Gives out energy
Takes in energy
Define combustion of fuels
Example equation
Reaction of a fuel with oxygen that produces at least 1 oxide & releases energy (Burning)
Fuel + oxygen 0-> CO2 + H2O + heat
Define neutralisation
Ionic equation
When acid & alkali react, hydrogen & hydroxide ions form water which is neutral.
H+ (aq) + OH- (aq) -> H2O (l)
Define displacement Example equation (zinc + copper)
More reactive element displaces less reactive metal from its compound.
Zinc + CuSO4 -> Zinc sulfate + copper
Define thermal decomposition Example equation (CaCO3)
Breaking down of a compound using heat Calcium carbonate (s) -> CaO (s) + CO2 (g)
Define cracking
Reaction used to break large hydrocarbon molecules into smaller molecules
Photosynthesis symbol equation
Light + 6CO2 + 6H2O -> C6H12O6 + 6O2
What type of process is bond breaking?
What type of process is bond making?
Endothermic
Exothermic
Symbol equation for methane and oxygen?
CH4 (g) + 2O2 (g) -> CO2 (g) + 2H20 (g)
What type of reaction is burning methane + why?
Exothermic because energy required to break reactant bones (CH4 + O2) is less than energy required to form bonds of products (CO2 + H20)
4 types of energy given off as a result of a chemical reaction?
Light, heat, sound & electricity
Exothermic or endothermic?:
- NaOH + H2SO4
- BaOH + NH4SCN
Exothermic
Endothermic
What colour is copper carbonate?
What colour is copper oxide?
Green
Black
What do metal carbonates thermally decompose into?
Metal Oxide + Carbon Dioxide
