Describe how the inter-conversion of solids, liquids and gases are achieved and recall names used for these inter-conversions

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1 Understand the arrangements, movements and energy of the particle in each of the 3 states of matter : solid, liquid and gas Describe how the inter-conversion of solids, liquids and gases are achieved and recall names used for these inter-conversions 1

2 Diffusion Experiment It is the movement of particles from region of high to low concentration. Factors affecting diffusion: Understand terms atom and molecule 2

3 Understand the difference between elements, compounds and mixtures 3

4 Describe techniques for the separation of mixtures, including simple distillation, fractional distillation, filtration, crystallization and paper chromatography 4

5 5

6 6

7 7

8 Recall that atoms consist of a central nucleus, composed of protons and neutrons, surrounded by electrons, orbiting in shells 8

9 Recall relative mass and relative charge of protons, neutrons and electrons Understand that the Periodic Table is an arrangement of elements in order of atomic number 9

10 Deduce the electronic configuration of the first 20 elements from their position in the Periodic Table Calculate relative formula mass (Mr) from relative atomic masses (Ar) Understand the use of term mole to represent the amount of substance 10

11 Carry out mole calculations using relative atomic mass (Ar) and relative formula mass (Mr) Write word equations and balanced equations to represent the reactions studied in this specification Use the state symbols (s), (l), (g) and (aq) in chemical equations to represent solids, liquids, gases and aqueous solutions respectively 11

12 Calculate reacting masses using experimental data and chemical equations Describe the formation of ions by the gain or loss of electrons Understand oxidation as the loss of electrons and reduction as the gain of electrons 12

13 Recall charges of common ions in this specification 13

14 Deduce the charge of an ion from the electronic configuration of the atom from which ions is formed Explain, using dot and cross diagrams, the formation of ionic compounds by electron transfer, limited to combinations of elements from Group 1, 2, 3, 4, 5, 6 and 7 14

15 Understand ionic bonding as a strong electrostatic attraction between oppositely charged ions 15

16 Understand ionic compounds have high melting and boiling points because of strong electrostatic forces between oppositely charged ions Describe the formation of a covalent bond by sharing of a pair of electrons between 2 atoms Understand covalent bonding as a strong attraction between the bonding pair of electrons and the nuclei of the atoms involved in the bond Explain, using dot and cross diagram, the formation of covalent compounds by electron sharing for the following substances: 16

17 17

18 Recall that substances with simple molecular structures are gases or liquids or solids with low melting points Explain why substances with simple molecular structures have low melting points in terms of the relatively weak forces between the molecules Properties of simple Covalent Structures: Explain the high melting points of substances with giant covalent structures in terms of the breaking of many strong covalent bonds 18

19 Describe a metal as a giant structure of positive ions surrounded by a sea of delocalized electron Structure of metals 19

20 Explain the malleability and electrical conductivity of a metal in terms of its structure and bonding Understand an electrical current as a flow of electrons or ions An electric current is a flow of electrons or ions Understand why covalent compounds don t conduct electricity 20

21 Understand why ionic compounds conduct electricity only when molten or in solution Recall that electrolysis involves the formation of new substances when ionic compounds conduct electricity 21

22 Describe simple experiments for the electrolysis using inert electrodes of molten salts such as lead (II) bromide Write half-equations representing the reactions at the electrodes during electrolysis 22

23 Understand the term group and period Recall the positions of metals and non metals in the periodic table Explain the classification of elements as metals or non metals on the basis of their electro conductivity and the acid-base character of their oxides 23

24 Understand why elements in the same group of the Periodic Table have similar chemical properties Recall noble gases (Group 0) as a family of inert gases and explain their lack of reactivity in terms of their electronic configurations Recall the relative reactivity s of the elements in Group 1 24

25 Make predictions about the properties of other halogens in this group Recall the relative reactivity s of the elements in group 7 25

26 Understand these displacement reactions as redox reactions Describe test for Oxygen 26

27 Describe test for Carbon dioxide 27

28 Water + Metal Metal + Oxygen Metal + Acid Salt + Hydrogen Metal oxide Salt + Hydrogen (MASH) Understand oxidation and reduction as the addition and removal of oxygen respectively 28

29 Recall the conditions which iron rusts Iron rusts in the presence of oxygen and moisture To prevent this, we should add grease, oil or paint to prevent contact from oxygen and water Describe simple tests for gases 29

30 Understand how the ph scale from 0-14 can be used to classify solutions as strongly acidic, weakly acidic, neutral, weakly alkaline or strongly alkaline Define acids as sources of hydrogen ions, and alkalis as sources or hydroxide ions 30

31 Predict the products of reaction between dilute hydrochloric, nitric and sulfuric acids and metals, metal oxides and metal carbonates. Metal + Acid Salt + Hydrogen (MASH) Carbonate + Acid Salt + Carbon dioxide + Water Acid + Base Salt + Water Acid + Alkali Salt + Water 31

32 Understand Endothermic and Exothermic reactions Exothermic reactions- when products contain less energy than the reactants, heat is released or given out to the surroundings. E.g. Burning or combustion of hydrocarbon fuels like petrol Burning of magnesium Endothermic reactions- when products contain more energy than the reactants, heat is taken away or absorbed from the surroundings. E.g. thermal composition of limestone Cracking of oil Recall that the breaking of bonds is endothermic and the making of bonds is exothermic Describe the effects of changes in surface area of a solid, concentration of solutions, pressure of gases, temperature of gases, temperature and use of catalyst on the rate of a reaction 32

33 Recall that some reactions are reversible and are indicated by symbol in equations Reversible reactions occur when the backwards reaction (products reactants) takes place relatively easily under certain conditions; the products turn back into the reactants In some reactions, the products of the reaction can react to reform the original reactants such reactions are reversible (the symbol in an equation shows it is reversible) Catalysts increases the rate of reaction by helping back chemical bonds in reactant molecules 33

34 Describe and explain the extraction of aluminum from purified aluminum oxide by electrolysis, including: The need to replace positive electrodes 34

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