Presentation on theme: "Year 12 What you should know already"— Presentation transcript:
1Year 12 What you should know already 25/03/2017Year 12 What you should know already
2Elements and symbols that you should know: 25/03/2017Elements and symbols that you should know:Part 1 – The obvious ones:HydrogenHeliumLithiumBerylliumBoronCarbonNitrogenHHeLiBeBCNOxygenFluorineNeonMagnesiumAluminiumSiliconPhosphorusOFNeMgAlSiP
3Some more obvious ones: 25/03/2017Some more obvious ones:SulphurChlorineArgonSClAr18) Calcium19) ZincCaZnThe less obvious ones:SodiumPotassiumIronCopperSilverNaKFeCuAg6) Tin7) Gold8) Mercury9) LeadSnAuHgPb
425/03/2017What is an ion?An anion is an atom that has gained electron(s) to form a (-) ione.g Cl- (Chloride)S2- (Sulfide)or a cation is an atom that has lost electron(s) to form a (+) ione.g Na+ (Sodium)Fe2+ (iron (ll) ion) (aka Ferric ion)Fe3+ (iron(lll) ion ) (Ferrous)
5The formula for Ions that you should know: 25/03/2017The formula for Ions that you should know:Write the ion or name beside the followingHydrogen ionCarbonateLithium ionMagnesium ionOxideSulphateSodium ionIron (ll) ionH +CO32-Li +Mg 2+0 2-SO42-Na +Fe 2+OH -S 2-Cl -NO3 -Al 3+Pb 2+Ca 2+Fe 3+Hydroxide ionSulphide ionChloride ionNitrate ionAluminium ionLead ionCalcium ionIron (lll)
6A substance made of one type of atom is called an element 25/03/2017Atoms and elementsA substance made of one type of atom is called an elemente.g. a piece of Aluminium (symbol Al) consists of only aluminium atoms bonded together and is called an element.
7Molecules25/03/2017Some elements are unstable as single atoms and only exist as 2 atoms bonded together to form a molecule.These are usually gasese.g H2 , N2, Cl2, O2
8Compounds and Molecules 25/03/2017Some compounds are molecules that contain 2 or more different atoms covalently bonded together. Some common molecular compounds are:CO2 (carbon dioxide)H2O (water)CH4 (methane)C6H12 O6 (glucose)
9Rule – If two identical elements combine then the name doesn’t change Naming compounds25/03/2017Rule – If two identical elements combine then the name doesn’t changeName the following elementsH2N2O2F2Cl2Br2hydrogenflourinenitrogenchlorineoxygenbromineThese elements always go around in pairs (diatomic molecules). For example, hydrogen looks like this:
14How could you produce CO2 in the lab? 25/03/2017How could you produce CO2 in the lab?Add calcium carbonate to some acid eg HCl or H2SO4How would you test for the CO2 gas?By bubbling it through limewater ( a solution of Ca(OH)2 ) and observing the solution go milky.
15How could you produce H2 in the lab? 25/03/2017How could you produce H2 in the lab?Add Mg to some acid eg HCl or H2SO4How would you test for the gas?By igniting the gas using the pop test.
16How could you produce O2 in the lab? 25/03/2017How could you produce O2 in the lab?manganese dioxide and hydrogen peroxide in a test tube produces oxygen gasHow would you test for the O2 gas?By placing a glowing splint into the tube and seeing if it would relight