2019 O Levels revision - O Levels Combined Chemistry 2018 revision

[00:00:00]Phoenix so use has be fine as a single Neutron for this rather that been good okay no I don't they be move [Music] No okay so that's all right so the diagram shows two methods of collecting gas so we have the one with the measuring cylinder and then I will get job now if you look at the one on the right which has got to be the gas show with people to the top okay so likewise on the left the gas you go to the top so for metal number two it has to be less dense right the gas has to be less dense okay hello hello yeah yeah stand on the left side must be insoluble okay gotta be insolvent what I know you will dissolve inside so we look at the options available property one in solar burn as there's gotta be be alright continua yeah next so against axis soluble in water in solution turns rich the best blue so it is really must do we must be alkaline which damage correct guess x other weapons introduced when it saw me okay so yeah the one with fun is not sure it's not correct okay we should get is a black once again stable i mo ammonium yes yeah yeah in the normal of chemistry there's only one gas is then that is a filler right so it's got to be a guest so so we want to find is not correct agree with me is obtained when equals Moody's add that one drop two equals I am free I am free now well I am trained in degree or is it red really strong thanks which is represented by the diagram we count the number five all right so look at the corona cable I have it with me Table five it's boron okay so pour on now they are too cool right you don't know this one so is it 11 or 12 yeah means he must count and I'm all alone 7 so much it is right but 5 plus 7 equals oh yeah thanks wish they were discernible ecovillage so covalent is very right yeah Jerry and it's not matter act so it'd be ok Coulomb one is not matter remember ionic 1 is metal and nonmetal so available in just no metal okay ok next why is the total one against many at the end of the experiment total volume of gas so we have this is 20 cm q7t this is what the no car so we want the volume of gas to miss out of 500 co2 today volume of co2 volume of co2 okay so let's take a look here this equation tells me that the ratio between 18 oxygens it's 1 is to 3 because it is one industry great yeah so if I have 20 of these do I need 70 the only right because the ratio is 1 to 3 the mean I only need 60 you okay what this is is that's extra oxygen in this whole experiment all right that's extra oxygen in this experiment so what I want to do is I want to look at okay on look at this yeah after reacting right if I think 30-60 I'm not repent right yeah okay then after that 20 the originally this is 1 is to 2 it means there's going to be 40 cm cube Oh coming outside gets produced right yeah because once it - right so so the question is what is remaining at the end of the experiment the remaining ones are these because it is produced and this because it's not used okay so we look at the red color is 10 and 40 and says be 50 all right hello but why did you hide it then simply what you - oh okay 1 the ratio ok 18 verses of the general is 1 is to 3 so I have the ECM view of this I will meet only 16 cm but they give us 70 oxygen what it means is 70 CM piu I will use up 60 and I've learned through 10 there is a 10 extra there is not reacted the level word the step over 10 so you can't get these friends done using me yeah oxygen how about outside with that 40 because their ratio is here is 1 is 2 - so I would have 40 40 cm cube here event so the question is what is left after the experiment we just had a hottie Christina will appear yeah please step in okay I see I see great now this pressure is a full concept fashion to find the concentration software I see in the IC wait you must fire how many we must find how many moles or sorry at sea okay all right do we know how many moves or suppress today yes don't have a they never come off don't say that you're right yeah I was even I go fever yeah I don't know I think I'm not conceived on some honor yeah I think so yeah so I think you read that strategy okay now I'll just boot Rua right now first we find this is a zero point zero two eight times zero point five okay because we had 28 cm kill audio but I hope at the end few first I need convert these to DM cube the donate save you must convert to DM cube so I divide by 1000 can ya to get this number so I times your point five I know what your point zero one four more so for so the other side here is zero point zero one four more all right thanks I want to find how much h2so4 is there so the ratio is 2 is 1 2 is to 1 that means this the dhamma movie is your point zero zero seven okay because it's hot this 2 is to 1 please ha actually if you take this / - alright okay this one yeah alright so - my zero seven more so I feel much example of h2so4 but in 25 see oh I see three so to find a concentration I just take 0.007 divided by zero point zero two five once again you convert this to be Acula so zoning the calculator against your 0.280 enq right silence is a okay take from four different zoning the XYZ dissolve in equal 20 cm 50 degree Celsius so we showed it to touch energy change when the solids are dissolved eating water for different sort of XYZ dissolved in equal volume water okay so we need to understand why it's them you know and do it all right and know and EXO EXO means give off heat and owe me right so X okay let's look at W AB you this is endothermic I cannot see ya wrong because it is endothermic the temperature or not you must so this is actually so that's again alpha B X this end oh yeah Z is x over B okay yeah Thanks calcium company in Miami I don't I see so this is a SC blast up on it you get salt what I'm gonna suggest we change will increase the speed of reaction okay plus I decrease the temperature decrease the temperature will increase the speed no if you decrease the volume also no increase in concentration increase the size no see it see right yeah okay okay no just keep going yeah which change happens the oxidation oh no the oxidation state should increase so oxidation state in peace anyway what is the answer is d yeah because of the addition statement 0 become 2 plus so the oxidation state actually increase okay yeah yeah this time we do not - I mean this one then this one say hey no see you too he's also - 2 + became 0 all right then here zero become - so these only answer ok next which thing about acid and base is not correct so patient and the one not hello yeah that's correct a metal about be a city outside of a metal rail with oxygen is that true city upside is it metal or no matter see you outside ease the metal on the metal no this guy's a metal all right metal oxide will produce basic oxide yeah that won't okay why is councilor soil is to increase the pH and neutralize acidity level see right because calcium oxide is alkaline transverse is alkaline so it will increase pH and you can utilize acidity all right 12 we found Yoko one decreased of the group so 12 is a the melting point decreases not Google remember this product table here do this speciation will occur so we want to find out which one will replace something else 13 okay most reactive is magnesium and magnesium and most active I so you were replaced and see because it is least reactive are less reactive yeah all right so this all right which the human is no reason for recycling iron for the decrease of our era recycling does not decrease the monitoring success 15 combination right else memorize see this is memory work for 15 right pick one common pollutants I showed with it one cost euro yet this paper is as well so the one that cost zero is this - that's a 3d which is correct for alkene and alkyne 70d okay do you remember their reactions combustion recoverable source a homologous series so homologous series can be either at all XE alkaline alkaline okay Noel key okay so this is not it's alright it's not D Y D class they follow the cnh2n + - o Mila all right you can use the formula for the different happens in the parent cell okay are you okay emergencies yeah they are all same family same homologous mean same family so a second addition polymers show with road is faster used to make this polymer manova is the individual block okay so this is the individual block you see that yeah so we want to look at individual block what's so special about this nineteen okay which alkane alkane undergo polymerization yeah okay okay okay the for polymerization kidding that's okay I'll go polymerization if you be our King oh okay okay and it goes polymerization so alkene is unsaturated remember alkenes are unsaturated where's our insecurities okay alkene and saturated so is it as yummy thank you so anyway it should be okay because it's an alkene that's I see you know your change from reddish-brown to Kotzebue and bromine this is hello generation okay remember how often does a chicken attract I prediction hydrogenation and ordination okay yeah so bromine is the Swiss change cannot be achieved by a single Wendy we ethanol open or absalom because you must go through oxidation then polymerization all right why because you're in your study of organic here is there a over that change at the note oh but not okay right unis have already doing a compassion we have polarization he also have alcohol change to exceed yeah that's then you have teaching quality this polymerization could pose to ethanol and comfort this yeah so okay yeah okay so we're done with execute yeah let's speed okay completed table okay what is a museum economical Atheneum is a metal aluminium Amla oxide ko3 let's look at the periodic table so I see now metal I see is it basically a factory or accident in space a because no matter is a city so much all of us be please see okay lots on aluminum is factory yeah solve this yeah bee bee bee yeah and second one it's a and B D and E Thank You Cathy yeah and E they are three today three of them say one they're looking for three food coloring food do you see that yes okay so so this one is water ng is what the H resulted when holding the creat page so it's again means it's a mixture right it's not pure I we're not an NFC we're solid but Meltzer fixed temperature fix temperature so fix temperature means is a power to become conductor I mix all the atoms in a molecule of gas J I think all the atoms in a molecule identical so it's an element all right so we got a figure out F is a mixture right Y is a division because some I mean some don't affect the mixture G GD is a compound right h2o G is a compound so it will g combo now H is a mixture right is a compound so we deduce the way thanks named apostles which last few such as petrol diesel separate petroleum fractional distillation right remember the key genki-dama be this kind of process oh we're okay the pigeon kicked all of your yeah young King Ptolemy so peachy and it down Lobby he is petroleum gas is gasoline is lubricating oil be too much okay so this current process we see talked about fractional distillation process first could around whoever super oil who L is heated right then all these different apena because they are different boiling point due to the different boiling point so the one with the less boiling point will appear here go up what if I were at the top the water bottle has the higher boiling point okay so you got a discarded hoe Tina oh yeah yeah thanks it's not to bad piggies okay so in the general form without this now it has a hitch once we alcohol all right so what's the general form of alcohol cnh2n plus 1 o H this is the general my city's name and give the chemical formula for a second so second member remember is mad at pac-man is one two three four ma'am so again what was it be can works it is yeah yeah because it's a alcohol so much be well so that's a chemical formula c2h5oh okay when that I suppose we're supposed only oxidized oxidized means add oxygen okay so when you add oxygen if it had no see right twice the full structure oh my god draw the pain remember all this yeah good do remember is okay why you won't come over here huh won't come out that's a chemo familiarize I said that you owe this honor SC I mean alcohol your answer oxygen because I see okay yo so recap number two is what II all right because you do you remember this all this stuff organic and I remember the alcohol remember that no yes you back okay so yes they okay thanks so use has be fine as a single Neutron for this rather lapping world no I don't they be no like no you choose a number and see you know okay we find a single Neutron okay so this team condom roto number new carnival is the same as Neutron plus proton okay hello yeah yeah Neutron flux proton is new calendar so if you want to find a sample in Prague you need to take these - nuclear on - proton so the answer is actually K star okay because you're miners and 3 minus 2 is 1 that means this one in from thanks which mine is praising you part of the product is well how do we know if it is group 5 good fine a significant number right we find that this is 2 comma 5 okay the formula is 2 comma 5 so 2 plus a kazoo 7 right so 7 + 6 on electronic structure 2.8 so noble gas Oh Oh Ali come on Corinne now Anacapa means mental last long letter right so chlorine is a non-metal environmental factor there are mainly possibility all right so L okay and what was okay she is okay right as you choose a metal which is AI of a single negative charge there is a negative one now this negative one q it was a stool seven structure formula I mean the electronic configuration to a seven means not at all my electron so it's a single negative charge we have both isotopes of the same element now the worst animal means proton and voice se just look at which one has the same proton occur I only got two of them so our end okay yeah next well you need to sleep I slept like you know pharmacy and what is the second member from the C to misfire okay so alcohol plus oxygen when you get ago a sea Krait yeah no see came to the wrong then why take two times six alright expert I knew so young yet one is so this is a hard to get right yeah so else is h2o Katie is the soft side you know I saw it so pops out to confirm s is hydrogen so that's right now and yes okay thanks now green color what is green color I into our three green colors iron hydroxide sorry because it's a black rocks and these are you okay let's continue so that means the powder metal must be onion something traditionally Arjun yeah right so our because iron was produced so we solution so onion class last se I am for ride right is is a n4r okay so I know all right class equals when I did yeah this is the kuraki track what is this white padded with you today see well right so you is okay even I was looking to write a balanced anyone reckons you did so there's two moving in twos yeah so I see I see so yeah all right yeah are you running Hosanna Yeah right no sore throat yeah something digestant Atlas videos comedy uh wrong this is never okay so this is a serious family so a seed blast happening now the one ingredient so do you know I won't even let me write down because it's that happening I don't know what company they will Co 3 to minus plus h class because I'm Sid I see it's hbox h2o practice the key allocated to each class this is a 100 has one more in fire present okay there are financing to do involve again - so one dmq has Giocondo it I'm a Pharisee and pew so fast it's just your / - were / - 0.04 just try to alright can see that whiteboard yeah okay so we look at second B so describe how you would distinguish between an acid a alkaline so to change different students in the alkali we will use the universal indicator so the universal indicator will eat different colors if it is a CD so actually would be red of course the alkali would be blue or indigo all right so it's too much so what you can do is you can suggest others like libras people as well right so leave this litmus paper so the litmus paper okay limits to the test it is a city you turn blue to red and then it is alkaline your turn red to blue right so that's just the trains the tricep and I know to spend too much time to other mixing water one is from one is a polite your SSD so we know ammonia is alkaline and this HCl is a city and so the question is why now for something to be out alive there has to be a hitch oh fish - I own yes it is the H+ ion so we just say that when it's dissolved in water so there's a releasing water we're gonna miss the water he releases the ownage ion which is alkaline in HCl is with water releases the H+ ion which is acid a okay just remember only enjoys alkaline which passes today so this tool can utilize present right now equation no neutralization equation is always the same it's always h plus plus oh hey - forgive this - oh right so this is the neutralization recognize the rice this one it's one the most interaction occupy qtr complete minutes again in example saturation refers conclusion so this is another question all right so you can give many examples there are many examples you can give for example combustion all right so let's say burning something okay the example given its 2 H 2 O 2 we have 2 H 2 O 2 this burning of hydrogen to produce what tow so there's a balance can be region mix on many other chemical agent takes days so example is Russ rusting fermentation right rusting and fermentation he says of calcium relevant I see the producer gets this really accomplished in five minutes mr. Biderman even me to determine the speed so if you want to find the speed you can measure the volume of gas produced using gas swings and stops I actually wanna make it a tie myself so drug graph they will show how this feel reaction so the speed will be very positive or not and after that we will just stop after all of it is being used up hey after all the this is one your guests this is time okay it's time pass by guess will decrease