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Chemistry KS3

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Christopher Ironside

on 11 June 2013

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Transcript of Chemistry KS3

Chemistry
Weathering and erosion
break rock into smaller pieces. Transportation is the movement of the eroded peices of rock, usually by rivers and streams in this country.
Rock Cycle
REACTIVITY SERIES
Acids and Alkalies
potassium
sodium
calcium
magnesium
zinc
iron
lead
copper
gold
Chemical
Reactions
Rocks underground that get heated so much they melt turn into magma. Magma is liquid rock. Magma also comes from deeper inside the Earth, from an region called the mantle.
When the magma cools down underground, it turns into intrusive igneous but when it cool down as lava, it turns into extrusive igneous rock.
Acids
When metals react with air, they create metal oxides.

metal + oxygen ->

metal oxide
when metals react with water they produce a metal hydroxide and hydrogen.

metal + water -> metal hydroxide + hydrogen
b
Acid and alkali strength is measured using the
pH scale. 0(or 1) is the strongest acid, 14 the strongest alkali.
Common acids: Common alkalis:
sulphuric acid potassium hydoxide
hydrochloric acid sodium hydroxide
nitric acid calcium hydroxide
How Are Rocks
Formed
Formation of sedimentary rocks
Formation of sedimentary rocks
The inside of the Earth is very hot - hot enough to melt rocks. Molten (liquid) rock forms when rocks melt. The molten rock is called magma or lava.

The magma that solidifies inside he earth is known as intrusive igneous rock.

The lava that cools down outside the Earth is known as extrusive igneous rock
When metals react with acids they create a metal salt and hydrogen

metal + acid -> metal salt + hydrogen
Alkalis are also called bases
Metals
Metals are object that can react with acids, water and air. They are all part of the periodic table along with the noble gases. they are classified in the reactivity series
Formation of Metamorphic rocks
Mixtures and Compounds
Metals
Mixtures are 2 or more atoms not
chemically combined

They are easy to separate

Compounds are elements chemically
joined

They are very difficult to separate
You and your genes

Genes are found in our chromosomes,which parents pass on to offspring in their sex cells in reproduction. Different versions of the same gene are called alleles, and these can determine features like eye colour, and the inheritance of disorders such as cystic fibrosis.
Earth movements can cause rocks to be deeply buried or squeezed. As a result, the rocks are heated and put under great pressure.

They do not melt, but the minerals they contain are changed chemically, forming metamorphic rocks.

Sometimes, metamorphic rocks are formed when rocks are close to some molten magma, and so get heated up.
Rocks underground that get heated and put under pressure are changed into metamorphic rock.
Sedimentation creates layers or rock particles.
Compaction and cementation presses the layers and sticks the particles together. This creates sedimentary rock.
The deposited rocks build up in layers, called sediments. This process is called sedimentation.

The weight of the sediments on top squashes the sediments at the bottom. This is called compaction.

The crystals form a sort of glue that sticks or cements the pieces of rock together. This process is called cementation.

These processes eventually make a type of rock called sedimentary rock. It may take millions of years for sedimentary rocks to form.
Chromosomes
Chromosome are structures found in the nucleus of most cells. They consist of long strands of a substance called deoxyribonucleic acid, or DNA for short. A section of DNA that has the genetic code for making a particular protein is called a gene. The proteins can either be:
•structural proteins such as the ones found in muscles and hair
•enzymes, such as proteases and other digestive enzymes.
Displacement Reactions
Chromosomes
Chromosome are structures found in the nucleus of most cells. They consist of long strands of a substance called deoxyribonucleic acid, or DNA for short. A section of DNA that has the genetic code for making a particular protein is called a gene. The proteins can either be:
•structural proteins such as the ones found in muscles and hair enzymes, such as proteases and other digestive enzymes.
If the metal is more reactive than the
metal from the compound, then it
displaces it.

iron+copper sulphate-> copper+ iron
sulphate

Iron has displaced copper
Pollution in the atmosphere
Air pollution is the introduction into the atmosphere of chemicals, particulates, or biological materials that cause discomfort, disease, or death to humans, or damage the natural environment or built environment.

The atmosphere is a complex dynamic natural gaseous system that is essential to support life on planet Earth.

Stratospheric ozone depletion due to air pollution has long been recognized as a threat to human health as well as to the Earth's ecosystems.
Thank You! Drive Safely
RAMON
ZHI
CALLUM
FINIAN
RAZA
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