Chemical Earth Revision

R1• identify the difference between elements, compounds and mixtures in

terms of particle theory• Particle theory explains the properties of SOLID, LIQUID and GASES in

terms of particles– Solid : Particles are static, shake with heat but remain locked in position. Solids

retain shape– Liquid: Particles stick close to each other but can slide around making a liquid

take up the shape of its container, or become a drop due to surface tension when falling as rain, or in space . Surface tension is due to the sticking together of particles COHESION

– Gases the particles ping around filling containers, causing pressure against the walls. Gases and liquids will DIFFUSE due to motion of particles

• Elements and compounds have all particles the same, the compound made of different types of atoms. While a mixture there is more than one type of compound

R2

• Students identify that elements in the periodic table are arranged in order of the numbers of protons.

• An element is defined as having a certain number of protons, He – 2 C-6– More or less electrons the element is the same but charged.– Number of neutrons defines the isotope– Negative ions are big due to extra electons– Positive ions are small due to less electrons– Negative and Positive ions strongly attract each other in ionic

bonds– Water can be dragged into between ionic bonds and the ionic

crystal becomes aqueous, expanding to through the entire liquid

R3

• Students identify groups and periods in the periodic table and describe some relationships between elements e.g. metals, non metals, halogens, noble gases, active metals.

• The Periodic Table is designed to show Periods where Columns have the same type of property, compared to neighbours, but a trend following down a column/ group

R3

• Finding groups go to http://www.ptable.com/

• Click on the group number and learn the groups.

R3

• IUPAC group number goes to 1 to 18• But textbooks and schools use Roman

Numeral Groups

R4

• identify that the biosphere, lithosphere, hydrosphere and atmosphere contain examples of mixtures of elements and compounds

• atmosphere

R4

• Biosphere is broken down to biomers and ecosystem and populations and individuals that are made of cells

R4

• Lithosphere – rocks – minerals –compounds

SiO2

KAlSi3O8 – NaAlSi3

O8 – CaAl2Si2O8

Ie metal rich sand most commonCompound in rocks

More on Mica

R4

• Mica sheets of metal, sand, metal just something! http://newton.umsl.edu/run/nano/jmoltesv.html

R4

• Hydrosphere, water and saltwater

R5

• Students create their own models of ions and molecules and use their models to describe common elements, compounds and mixtures that exist in a layer of the Earth.