Chemistry C4. C5, C6

Chemistry GCSE Modules C4, C5 and C6 C4: chemic Patterns A: The yearly instrument panel sexual congress nuclear volumees be the canaille of atoms in proportion to the lightest atom, hydrogen, on a scale where hydrogen is 1. Groups of three nuclear number 18 groups of atoms with confusable properties, where the relative atomic mass of the middle element is the involve of the relative atomic masses of the other two elements, for grammatical case calcium, strontium and barium is a group of three. A day-by-day pattern is a tell pattern. On a periodic table: o A period is a row, and starts with a labile metal and ends with a noble gas. o A group is a column, and contains elements with confusable properties. B: The foot metals The root word metals ar reactive metals found in group bingle of the periodic table that react with water to form base-forming solutions.

Properties of alkali metals: o Can be cut with a knife o Shiny, but tarnish quickly with air, because a tier of oxide is organize o Good conductors of electricity o Float o Low thawing point Reactions of alkali metals: o lithium + water ( lithium hydrated oxide + hydrogen o squealing pop test with burning treat for hydrogen o Lithium + chlorine ( lithium chloride o Chlorides ar salts that argon colourless, crystalline and dissolve in water There are trends in the properties of the alkali metals: o Physical trends are tre nds much(prenominal) as melting point and ! density o chemical substance trends are trends such as reactivity o al-Qaida metals get more(prenominal) reactive as you get further nap the group Compounds of alkali metals are different from the elements, and can be important for our fooling lives, for example sodium chloride (salt). C: Chemical equations During a chemic change, there 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, bon ton it on our website: BestEssayCheap.com

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