My Cards Flashcards
What is the most abundant gas in the atmosphere?
Nitrogen
How much percentage does oxygen make up of our atmosphere?
20%
Where are vegetable oils found?
Seeds, nuts and some fruit
What is an ionic bond?
A force of attraction between oppositely charged ions
How were oceans formed?
Steam from volcanoes condensed to form water vapour and created oceans
What was the early atmosphere believed to be made up of?
Little oxygen and small proportions of water vapour, ammonia and methane
Aim of the Miller Urey experiment
The aim was to see whether substances now made could have formed in the conditions of the early earth
Why did co2 in the atmosphere decrease?
Co2 dissolved into oceans which meant there was a decrease in co2
What was observed in the Miller Urey experiment?
After a week, amino acids which are the building blocks for protein were found
Complex chemicals are needed for living things to develop could be produced naturally
The process of the Miller Urey experiment
Mixture of water, ammonia, methane and nitrogen heated to produce water vapour, an electrical spark was passed through to create lightening.
A week later, amino acids were formed which are the building blocks for protein.
3 ways copper can be produced
Smelting
Pytomining
Bioleaching
How do we prevent carbon dioxide entering the atmosphere?
Carbon can be stored in oil resivors
Properties of aluminium
Low density so it can be used in air crafts
Malleable
Corrosion resistant
Good conductor
What is NOT formed by combustion?
Oxygen
What is formed by incomplete combustion
Carbon
What is formed by complete combustion?
Co2 and h20
How do you crack hydrocarbons?
Hydrocarbons can be cracked to produce smaller molecules, you heat them up to produce vapour which is then passed over a catalyst or mixed with steam
Properties of small hydrocarbons
Less volatile
Where are viscous hydrocarbons likely to be found in a fractioning column?
Near the bottom
Why aren’t longer chain hydrocarbons useful?
Do not ignite easily
3 uses of polymers
Water proof coatings
Smart materials
New packaging materials
Issue with polymers
Not biodegradable so they landfill sites are increased and can release methane
Two ways you can make ethanol
Mixing ethene with steam
By fermentation
Atom A has a full outer shell so it is
Unreactive
What is seen when sugar solution and yeast are fermented?
Foamy bubbles of Co2
What do Iceland have volcanoes?
It is on a plate boundary
Why don’t scientists know when a volcano will erupt?
It is difficult to monitor what happens beneath the crust
How does activity in the earth result in plate movement?
Radioactive processes cause the plates to move suddenly as they move past each other
Conditions needed for hardening
Nickel catalyst at 60 degrees
Compounds formed from only non metals consist of particles called
Molecules
How to improve the method so results are more accurate
Repeat 3 times and find the mean
One property of a smart polymer that is different to an ordinary polymer
Smart memory
Two alloys
Zinc and copper form brass
Steel and chromium form stainless steel
