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Title: OCR 21st Century C3:Chemicals in our lives
Description: A document that gives a brief overview of C3 section of the OCR 21st Century School Textbook.
Description: A document that gives a brief overview of C3 section of the OCR 21st Century School Textbook.
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C3: Chemicals In Our Lives
What you already know:
The movements of tectonic plates leads to changes in the Earth’s surface
Alkalis neutralise acids to form salts
Crude oil is a valuable source of hydrocarbons
Polymerisation produces a wide ranges of plastics
A Journey Through Geological Time
The Earth’s outer layer is divided into tectonic plates
...
The
plates move because of very slow convection currents in the solid mantle
Movements of the tectonic plates cause oceans to open up slowly between continents in some parts
of the world
...
This mineral magnetite particles are found in many volcanic lavas and some sediments
...
Near the equator, the magnetisation lies horizontally
...
Measuring the angle at which rocks are magnetised allows the latitude of the originally formed rock
to be deduced
...
Comparing them against modern day organisms gives an idea which environment they existed in
...
Ripples in rocks formed by wind blowing or water flowing
...
As water in these salt
marshes evaporated, deposits of rocks salt formed
...
The Importance Of Salt
What is commonly referred to as salt is the compound sodium chloride
...
Another common use is to treat icy
roads in winter as salty water has a lower freezing point then pure water
...
In hot countries seawater
is run into pans and allowed to evaporated in the hot sunshine
...
This method of extraction leaves the salt
with insoluble impurities such as reddish clay
...
The salt dissolves and it is carried to the
surface as a solution
...
The solution of salt and
water is brine
...
How much salt should we be eating a day?
4g
Why does our body need salt?
Your body needs salt for function e
...
maintain a proper stomach pH
...
6-2
...
The word ‘electrolysis’, means using electricity to split
something up
...
Electrolysing brine makes: H2 Gas, Cl2 Gas and NaOH (aq) alkali
...
Electrons flow into a negative electrode (catnode) and out of a positive
electrode (anode)
...
The gas dissolves in water to make
hydrochloric acid
Title: OCR 21st Century C3:Chemicals in our lives
Description: A document that gives a brief overview of C3 section of the OCR 21st Century School Textbook.
Description: A document that gives a brief overview of C3 section of the OCR 21st Century School Textbook.