Chemistry in society

A rock that contains enough metal to make it worth mining is called an .........

Only the most unreactive metals, such as ............ and ..............., occur as .............. in their ores. The rest of the metal s are found as ................, from which the metals have to be ............ .

How do you extract potassium from a compound?

How do you extract aluminium from a compound?

How do you extract zinc from a compound?

Electrolysis is the most ............. method of extraction but it is very ............... since it uses a lot of electricity.

When extracting aluminium what is
-the positive electrode made of?
-the negative electrode made of?
-the electrolyte?

-What is the main ore of aluminium?
-This is first purified to produce?
-Why is aluminium oxide dissolved in molten cryolite to make the electrolyte?

When extracting aluminium what the reaction at the negative electrode?
What happens after this?

When extracting aluminium what is the reaction at the positive electrode?

What happens with this product?

State the steps of how to extract aluminium.

Draw a diagram of the extraction of iron.

The raw material used in iron extraction are...

In iron extraction oxygen (in the .......) reacts with the coke to form .............. .............. .
Equation

In Iron extraction carbon dioxide reacts with coke to form ........... ............... .
Equation

.......... ............... reduces the iron (III) oxide in the iron ore
Equation
Then what happens?

What is the limestone in iron extraction used for?

Name 5 uses of aluminium and the most important properties needed.

Name 3 uses and the most important properties for these.

What is crude oil?

Cruse oil has no direct use. It has to be .............. before it is of any use. The first step in refining of crude oil is .............. ............ . This is carried out in a ............... ...................., which is ...... at the bottom and .............. towards the top.

When refining crude oil it is split into .........., a ................... of hydrocarbons with similar .................. ..................... .

How does refining crude oil work?

Name the order of the different fractions from the lowest temperature (the top of the column) to the highest temperature (the bottom of the fractioning column).

List a major use for each of the fraction once refined from crude oil.

Why did chemists invent cracking?

What is cracking?

How does cracking work?

Why are cars now fitted with catalytic converters?