Science: Earth & Space Flashcards
The air around us all of the time is known as the xxxxxx
atmosphere
What are the most commonly known greenhouse gases?
carbon dioxide and methane
What gas’ increase in the atmosphere is closely linked to global warming?
Carbon dioxide
What is the CARBON CYCLE?
The carbon cycle is the processes by which carbon is naturally transferred to different stores through a range of natural processes
What are compounds?
Metals are a natural resource, with most being found joined with other elements in compounds
What is an ORE?
+ give an example
An ore is a naturally occurring rock which contains enough of a mineral to be worth extracting
An example is Bauxite, which contains aluminium hydroxide
How are metal extracted?
When metals are extracted they first have to be separated from other minerals in the ore
They they need to undergo a chemical reaction to separate them from the other element that they are joined to in a compound
If a metal is below carbon in the reactivity series, how can it be extracted?
It can be extracted by reacting it with carbon in a displacement reaction
• As carbon is more reactive it will take the place of the metal in the compound, leaving the metal on its own:
carbon + metal oxide ➞ metal + carbon dioxide carbon + copper oxide ➞ copper + carbon dioxide
If a metal is above carbon in the reactivity series, how can it be extracted?
Electrolysis can be used, this involves separating the metal by using electricity
What is the reactivity series ORDER?
magnesium
aluminium
CARBON
zinc
iron
lead
copper
Advantages of recycling?
Resources will last longer
It uses less energy than extracting new materials
It reduces waste and pollution
Disadvantages of recycling?
Separating rubbish can be seen as a nuisance
The lorries collecting recycling produce pollution
Some materials are easier to recycle than others
