revision 3 Flashcards
exothermic
A reaction which gives out energy is exothermic; the reaction gets hot due to energy going into surroundings
bonfire, neutralisation
endothermic
A reaction which takes in energy is endothermic and it is cold due to taking in energy (electrolysis and ice melting
Bond energy definition
amount of energy in kJ/mol required to break one bond, this same amount would be released during bond making.
To calculate energy change/enthalpy change
energy of bonds broken- energy of bonds formed. A negative answer shows an endothermic reaction
Electrolysis
is the process of using electricity to split water into hydrogen and oxygen
redox rhyme
oilrig
hadies test
add dil nitric acid (removes carbonate ions)
add silver nitrate
hadies test result
precipitate,
cl=white
br=cream
I= yellow
Oxides that can react with both acids and bases are called
amphoteric
Metal oxides are
basic and ionic, form salt and h20
photosynthesis equation
6co2+6h2o=C6H12O6+6O2
Titration
a technique used where a solution (known) is used to determine the concentration and nature of an unknown substance, indicators will be used to check when the experiment is done.
RF value for chromatography
how far the substance has travelled from the start (highest point)/ how far the solvent has travelled (the water)
titration
using a big glass pipet and adding drops, can precicely see what drop changes the substance