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Edexcel GCSE Chemistry Topic 1 - Key Concepts in Chemistry




Below is everything the examiners think you know, if you're not sure of something click on the link to watch my YouTube video explanation. For a copy of these you can print off, get the FREE revision guide I wrote for you.

  

 • I can describe how the model of the atom has changed over time

 • I can recall that all substances are made from atoms 

 • I can describe the structure of an atom

 • I can recall the relative size of an atom and a nucleus

 • I can recall the relative masses of the three subatomic particles

 • I can recall the relative charges of the three subatomic particles

 • I can use the periodic table to state the number of protons, electrons and neutrons in an element

 • I can define the terms mass number and atomic number

 • I can define the term isotope

 • I can work out the number of protons, electrons and neutrons an isotope has

 • I can calculate the relative atomic mass of an element according to the relative abundances of the isotopes

 • I can describe the development of the early periodic table

 • I can describe how Mendeleev developed the periodic table

 • I can describe the location of metals and non-metals on the periodic table

 • I can describe the use of periods and groups to classify parts of the periodic table Video 1 Video 2 

 • I can draw the electronic structure of the first 20 elements on the periodic table

 • I can use numbers to represent the electronic structure of the first 20 elements on the periodic table

 • I can explain why atoms have no overall charge

 • I can describe the formation of ions

 • I can recall that metals will go on to form positive ions

 • I can recall the non-metals will go on to form negative ions

 • I can recall that ionic bonding occurs between a metal and a non-metal

 • I can describe the formation of ions Video 1 Video 2Video 3 

 • I can describe ionic bonding as the strong electrostatic attraction between oppositely charged ions

 • I can draw dot and cross diagrams to show ionic bonding between group 1 and group 2 metals and group 6 and group 7 non-metals.

 • I can name ionic compounds

 • I can work out the formula of ionic compounds

 • I can describe the structure of an ionic compound

 • I can describe the properties of an ionic compound

 • I can recall that covalent bonding occurs between 2 non-metals

 • I can represent the bonding in covalent compounds as a dot and cross diagram (hydrogen, chlorine, oxygen, nitrogen, hydrogen chloride, ammonia and methane)

 • I can draw covalent compounds using lines to represent electron pairs

 • I can recall the names and formula of common covalent compounds• I can recall that covalent compounds can be small and simple or giant.• I can work out the formula of a compound from a picture

 • I can describe the structure of simple covalent compounds

 • I can describe the properties of simple covalent compounds

 • I can describe the structure of giant covalent compounds

 • I can describe the properties of giant covalent compounds

 • I can use experimental data to determine if a compound is ionic, simple covalent or giant covalent

 • I can describe how the bonding in diamond affects the properties

 • I can explain the difference in bonding between diamond and graphite

 • I can describe how the bonding in graphite affects the properties

 • I can describe how the structure of graphene give it properties that can be useful in the modern world

 • I can describe how the structure of fullerenes give them properties that can be useful in the modern world

 • I can describe how the structure of carbon nanotubes give them properties that can be useful in the modern world

 • I can describe the structure of a polymer

 • I can describe the properties of a polymer

 • I can explain how strong metallic bonds arise

 • I can explain why most metal have high melting and boiling points

 • I can describe the pattern of atoms in a pure metal

 • I can explain why pure metals are not used often

 • I can explain how metals conduct electricity

 • I can represent a reaction using a word equation

 • I can represent a reaction using a balanced symbol equation Video 1Video 2 

 • I can calculate the relative formula mass (Mr) of a compound from the relative atomic (Ar) masses of the elements

Video 1  Video 2 

 • I can determine the empirical formula of a compound

 • I can describe how to use an experiment to find the empirical formula

 • I can calculate the mass of a reactant or a product given the equation

 • I can calculate the concentration of a solution in g/dm3

 • I can define the term mole - Higher tier only 

 • I can calculate the number of moles from the mass - Higher tier only 

 • I can describe the number of particles in one mole as being equal to Avogadro’s constant -Higher tier only

 • I can explain the need for reactants to be in excess

 • I can determine the stoichiometry of a reaction