Chemistry Paper 1 in 5 Minutes Everything You Need To Know Combined and Triple Science AQA

this is GCSE chemistry paper 1 in 5 minutes both combined and triple science have five topics for paper 1 chemistry so straight away topic number one atomic structure and the periodic table within an atom there are three subatomic particles the electron the neutron and the proton and you need to know these properties from this table like the back of your hand ke points involve the proton and neutron having relative mass of one and make sure you understand the different charges on each of the subatomic particles on the periodic table you'll notice every single element is laid out and there will be number at the top and number at the bottom one of these is the atomic number one of these is the mass number the atomic number indicates the number of protons this is matched by the number of electrons and the mass number is the sum of the number of protons and neutrons if the atom has add some changes made to it such as the number of electrons or neutrons this becomes either an isotope or an ion compounds and mixtures are very very similar but do have some distinct differences compounds are when particles are chemically joined together and mixture is simply when the particles just exist together now if you want to separate compounds or mixtures into their original elements there are four main ways to do this and those are crystallization filtration chromatography and then also distillation distillation can either be simple distillation or fractional distillation the fractional distillation is slightly more complicated and does involve few extra steps still within this topic you need to know about the plum hooding model and the history of the atom the plum hooding model was the original form of the atom that scientists believe to be true however after multiple experiments we are now left with the nuclear model which looks like this and contains the existence of the subatomic particles such as the proton neutron and electron and finally group one elements are called The Alkali Metals group seven elements are called the halogens and group zero or group eight some people call it are the noble gases you could be tested on any of those names the rest of the topics are lot shorter than that so stay with me till the end if you want to be exam ready topic number two bonding structure and properties of matter there are three main types of bonding ionic bonding calent bonding and metallic bonding here is table comparing all three of those simultaneously after this polymers polymers are long chains of repeated units also known as monomers and then we have the three states of matter solid liquid and gas it is important that you know each of the terms for switching between each of these states this is what the particles will look like within each of those States and also some properties about each of those States topic number three quantitative chemistry going back to those Mass numbers that we talked about from the periodic table you need to understand how to use those to work out things like the relative formula mass as you can see on screen here is an example where calculate the relative formula mass of carbon dioxide the same method can be applied to more comp complicated compounds and mixtures as well moles moles are used as kind of standard unit in chemistry in one mole of any substance there are 6.02 * 10 23 atoms this is known as avagadro's constant and at GCSE moles are used in formula alongside the relative atomic mass and the mass of substance good way to remember this equation is Miss moles with mass on his head and that is how it looks in the equation triangle for triple students only another subtopic to look is percentage yield and atom economy this is what that looks like and then for both combined and triple concentration and limiting reactants topic number four is chemical changes firstly you need to know the difference between acids and bases an acid is substance that forms solution with pH less than seven and Alkali is substance that forms solution with pH greater than seven this is not the same thing as base as base is substance that reacts with an acid to form salt from this there is whole series of chemical equations that you need to be familiar with the products of if you get tested on them so here they are on screen now next we have the reactivity series the reactivity series shows scale of how reactive these elements are with other substances so the ones at the top of the reactivity series are very reactive and are typically group one elements on the periodic table next are Redux reactions Redux reaction is basically basically reaction that involves electrons being transferred you can either get reduction reaction or an oxidation reaction and the acronym oil rig is great way to remember what each of these mean and finally electrolysis electrolysis is an example of another separation method that uses electricity to split up compounds it can also be used to separate metals from ores to extract it and finally topic five is energy changes within topic five we have and endothermic reactions an exothermic reaction is where energy exits the reaction and goes to the surroundings here is an example and an endothermic reaction is where energy enters the reaction and here is an example of that the best way to show endo and exothermic reactions are with reaction profile reaction profiles are shown on graph like this where you've got the energy level of the reactants and the energy level of the products and key detail on these graphs is the activation energy this is basically the required energy to make the reaction start in the first place and that sums up brief overview of GCSE chemistry paper 1 really hope this helped thank you very much for watching and best of luck in your exam