oxygen from 3 Flashcards
what is a diatomic element
only 2 atom per molecule
what is the air made up of
oxygen-21%
carbon dioxide-0.033%
nitrogen-78%
other gases- 0.967
what is a catalyst
a substance which speeds up the rate of a reaction without being used up by itself
what are the 2 substances in the experiment of preparation of oxygen, and the word equation
hydrogen peroxide and manganese dioxide
hydrogen peroxide > water + oxygen
test for oxygen and what can oxygen be used for
relight a glowing splint
breathing- deep sea divers and hospitals
welding
what is the observations of the investigation of products formed when elements react with oxygen
before during after
iron- grey solid orange sparks blue-black solid
carbon- black solid glows red and colourless gas
sparks and grey ash
copper-red brown begins to turn black solid
solid black
magnesium- grey bright white white powder
ribbon light
sulfur- yellow solid pungent gas colourless gas
mets to red liquid
blue flame
what is oxidation
reduction
redox
oxidation gain of oxygen or loss of hydrogen
reduction gain of hydrogen loss or oxygen
redox when oxidation and reduction happen at the same time
what is acid rain
what are the effects
how can it be prevented
WHAT
often found in fossil fuels- contain trace amounts of sulphur. when they are burnt the sulfur is oxidised to sulfur dioxide. is then released in to the atmosphere, dissolves in rain water and falls back as sulphurous acid
EFFECTS
lower the PH of rivers and lakes killing aquatic life
deforestation
damage of limestone and sand stone buildings
PREVENTION
burn less fossil fuels
use more renewable energy sources
pass sulfur gases through and alkaline to neutralise
what is the chemical name for rust and what 2 things must be present for rusting to occur
hydrated iron ( III ) oxide
water and oxygen
how can you prevent rust from happening
painting
oiling or greasing
galvansing
