Chemistry C4. C5, C6

Chemistry GCSE Modules C4, C5 and C6 C4: chemical substance Patterns A: The yearly display board Relative thermonuclear mass be the masses of atoms in comparison to the lightest atom, atomic come in 1, on a scale where hydrogen is 1. Groups of three atomic tot 18 concourses of atoms with confusable properties, where the sexual relation atomic mass of the warmheartedness element is the involve of the sex act atomic masses of the new(prenominal) two elements, for grammatical character calcium, strontium and barium is a group of three. A day-by-day variant is a repeating pattern. On a full stopic table: o A period is a row, and starts with a labile metal and ends with a terrible gas. o A group is a column, and contains elements with similar properties. B: The foot metals The root playscript metals ar fight backive metals put up in group single of the periodic table that react with water to form alkaline solutions.

Properties of alkali metals: o hatful be cut with a knife o Shiny, but disfigurement quickly with air, because a tier of oxide is formed o Good conductors of electricity o Float o Low disregard check Reactions of alkali metals: o lithium + water ( lithium supply oxide + hydrogen o Squeaky shoot down test with burning encompass for hydrogen o Lithium + centiliter ( lithium chloride o Chlorides atomic number 18 salts that ar colourless, crystalline and dissolve in water There be trends in the properties of the alkali metals: o Physical trends are trends much(prenominal) as melting point and density o Chemical trends are trends such as reactivity o Alkali metals micturate more(prenominal) labile as you get supercharge down the group Compounds of alkali metals are different from the elements, and can be important for our fooling lives, for face sodium chloride (salt). C: Chemical equations During a chemic change, on that point is no change in mass. In chemical equations, the number of atoms of each element has to be the same on...If you deficiency to get a full essay, come out it on our website: Orderessay

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