chemistry of the atmosphere (topic 8+9) Flashcards
What is a formulation ?`
A useful mixture with a specific purpose made by following a formula.
What are the two phases of chromatography
mobile phase=liquid or gas
stationary phase=solid or very thick liquid.
In paper chromatography how many spots will a pure substance form on the paper
1
Give the formula for working out the RF value
distance travelled by substance/distrance travelled by slovent
Do you expect the RF value to change if you change the solvent used
yes
What colour does litmus paper turn in the presence of chlorine
bleached white
Which test is used to identify carbonate ions
add dilute acid drops and connect to lime water if ions are present limewater goes cloudy
How do you conduct a flame test
nichrome loop dip in HCL and hold over flame use colour to identify
what colour precipitate do iron (2) compounds form with sodium hydroxide
green
What occurs on addition of excess sodium hydroxide to a solution with AL3+ IONS
redissolves and goes colourless
Give the ionic equation for the formation of precipitate when a solution containing magnesium ions reacts with sodium hydroxide
MG (2+) + 2OH- =MG(OH) 2
What does the intensity of a flame emission spectrum of a solution relate to
the concentration of a certain ion in the soloution
Give three advantages of using machines to conduct chemical analysis
v. fast, accurate, sensitive
How do scientists think the atmosphere was formed during first billion years or so
volcanoes,nitrogen,water vapour,ammonia,co2
Name five gases that scientists think were present in the early atmosphere
volcanoes,nitrogen,water ,ammonia,co2
