revision 3

Question 1

exothermic

Answer 1

A reaction which gives out energy is exothermic; the reaction gets hot due to energy going into surroundings
bonfire, neutralisation

Question 2

endothermic

Answer 2

A reaction which takes in energy is endothermic and it is cold due to taking in energy (electrolysis and ice melting

Question 3

Bond energy definition

Answer 3

amount of energy in kJ/mol required to break one bond, this same amount would be released during bond making.

Question 4

To calculate energy change/enthalpy change

Answer 4

energy of bonds broken- energy of bonds formed. A negative answer shows an endothermic reaction

Question 5

Electrolysis

Answer 5

is the process of using electricity to split water into hydrogen and oxygen

Question 6

redox rhyme

Answer 6

oilrig

Question 7

hadies test

Answer 7

add dil nitric acid (removes carbonate ions)
add silver nitrate

Question 8

hadies test result

Answer 8

precipitate,
cl=white
br=cream
I= yellow

Question 9

Oxides that can react with both acids and bases are called

Answer 9

amphoteric

Question 10

Metal oxides are

Answer 10

basic and ionic, form salt and h20

Question 11

photosynthesis equation

Answer 11

6co2+6h2o=C6H12O6+6O2

Question 12

Titration

Answer 12

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.

Question 13

RF value for chromatography

Answer 13

how far the substance has travelled from the start (highest point)/ how far the solvent has travelled (the water)

Question 14

titration

Answer 14

using a big glass pipet and adding drops, can precicely see what drop changes the substance