past paers Flashcards
(29 cards)
gas produced by thermal decomposition of calcium carbonate
CO2
environmental problem caused by sulfur dioxides dissolving in the atmosphere
acid rain
why would a student would immediately measure the mass of spirit burner after heating
prevent mass loss from evaporation
why does a black solid form in practical
oxygen supply is limited
what ion prodcuses red flame
lithium
cream precipitate from silver nitrate
silver bromide
white precipiate
bromide
why shouldny you put the water over the baseline
will interfere with results
thermal decomposition definition
breaking down by heating
isomer definition
same molecular structure, different displayed
isotope definition
atoms of the same element (same number of protons) but with different numbers of neutrons.
how is anhydrous copper (ii) sulfate used to test for water
goes from white to blue
why does limewater change colour
calcium carbonate is formed
catalyst used in cracking
silica
temperature for cracking
600
why is cracking important (2)
alkenes needed to make polymers, shorter chain hydrocarbons are in higher demand
why is sulfur impurity a problem for the enviroment
sulfur dioxide is produced when fuel is burnt, reacts with rain to form acid rain
formula of rust
Fe2O3
what does greater temperature do to collisions
more collisions have energy greater than activation energy
how many carbon atoms is each carbon atom bonded to in diamond
4
what does diamond not have which means it cant conduct
delocalised electrons
test for pure water
measure if boiling point is exactly 100
what do you add to ammonium to give off ammonia
sodium hydroxide
how do particles in a gas move
quickly
