Y10 Revision of Work Completed in the Summer Term
Test 2nd week back in September!
2.1 The Nature of Substances and Chemical Reactions
elements as substances that cannot be broken down into simpler substances
by chemical means and as the basic building blocks of all substances
elements as substances made up of only one type of atom
compounds as substances made of two or more different types of atom that
are chemically joined and having completely different properties to its
constituent elements
how to represent elements using chemical symbols and simple molecules
using chemical formulae
how to represent simple molecules using a diagram and key
how to write the formulae of ionic compounds given the formulae of the ions
they contain
relative atomic mass and relative molecular (formula) mass
the percentage composition of compounds
atoms/molecules in mixtures not being chemically joined and mixtures being
easily separated by physical processes such as filtration, evaporation,
chromatography and distillation
chromatographic data analysis and Rf values
http://www.bbc.co.uk/education/guides/zt2hpv4/revision
http://www.bbc.co.uk/education/guides/zypv34j/revision
http://www.bbc.co.uk/education/guides/zgvc4wx/revision P1,2,5,
http://www.bbc.co.uk/education/guides/zysk7ty/revision/1 P1
http://www.bbc.co.uk/education/guides/zgg7hyc/revision Pages 1-3
http://www.bbc.co.uk/education/guides/zd8hvcw/revision/1 P1
https://www.youtube.com/watch?v=xbEeyT8nK84
https://www.youtube.com/watch?v=NZOhzIjsmPk
Extra Support Activity
Relative Masses 4
Name ______________________________ Class ____________ Date _________
Use a periodic table to work out the following questions.
SO2= 32 + 16 + 16
O2S = 16 x 2 + 32
SO2 ≠ 32 + 16 x 2
Take care when inputting information on the calculator!
1 Calculate the relative formula mass of the following substances. You will need to use the relative atomic masses
(Ar) shown above.
a SO2
Mr = 64
b Na2O _________________________________________________________
Mr = ________
c Al(OH)3 ________________________________________________________
Mr = ________
d K2CO3 _________________________________________________________
Mr = ________
e Cl2____________________________________________________________
Mr = ________
f Cu(NO3)2 ______________________________________________________
Mr = ________
g CaI2 __________________________________________________________
Mr = ________
h (NH4)2 CO3 _____________________________________________________
Mr = ________
2 Calculate the percentage by mass of the element shown in each of the following substances. You will need to use
the relative atomic masses shown above.
a %K in K2CO3
(2  39)
× 100
138
% K = 56.5%
b %S in SO2
_____________________________________________
% S = ___________
_____________________________________________
% Cl = ___________
_____________________________________________
% Fe = ___________
_____________________________________________
% Al = ___________
f %N in Cu(NO3)2
_____________________________________________
% N = ___________
c %Cl in CCl4
d %Fe in Fe2O3
e %Al in Al2O3