Ms. Tessy
Secondary Chemistry
Secondary Chemistry
Topics for the week
Year 12 Chemistry Ionisation energy and its periodic trend Year 11 Chemistry Revision- Units 1 to 4 Revision Test- 3rd January- Units 1-4 Year 10 Chemistry Balancing equations Neutrality of solutions Year 8 Math Algebra- Introduction Expanding brackets Dear year 10 and 11 students,
Following are the main points of Unit 3 Air and water. I hope this will help you while preparing for your IGCSE exams. Unit 3 Air and Water Main Points
Dear year 11 Students,
The following are the main points from Unit -1. This may help you revise the unit while preparing for your final examination. Please read and research more about each point using your text book or web. Please also practice answering the past IGCSE exam papers. Experimental Techniques – Main Points
A locating agent is used when the method is used for separation of colourless substances. (example- in the separation of amino acids, ninhydrine is used as a locating agent.) Rf value( retention factor)- It is used to identify the components separated by chromatography. Rf = Distance moved by the solute front from the base line/ Distance moved by the solvent front from the base line. Notes from chemguide: Chromatography is used to separate mixtures of substances into their components. All forms of chromatography work on the same principle. They all have a stationary phase (a solid, or a liquid supported on a solid) and a mobile phase (a liquid or a gas). The mobile phase flows through the stationary phase and carries the components of the mixture with it. Different components travel at different rates. We'll look at the reasons for this further down the page. In paper chromatography, the stationary phase is a very uniform absorbent paper. The mobile phase is a suitable liquid solvent or mixture of solvents. Rf values Some compounds in a mixture travel almost as far as the solvent does; some stay much closer to the base line. The distance travelled relative to the solvent is a constant for a particular compound as long as you keep everything else constant - the type of paper and the exact composition of the solvent, for example. The distance travelled relative to the solvent is called the Rf value. For each compound it can be worked out using the formula: If a sample gives just one spot in the chromatogram that means the sample contains only one substance or it is pure.
Topics for the week
Year 12 Chemistry Equilibria and equilibrium constants Kc and Kp Year 11 Chemistry Chemical equilibrium Unit Test on 08-12-16 – Unit-Chemical Equilibrium Year 10 Chemistry Presentations Rusting and prevention of rusting Quiz – Dec 6 – Unit- Air and water Year 8 Math Proportions Dear year 10 students, You may browse the following websites while preparing for your presentations: www.docbrown.info/page01/AqueousChem/AqueousChem.htm www.bbc.co.uk/schools/gcsebitesize/science/add_gateway_pre_2011/chemical/waterrev1.shtml www.bbc.co.uk/schools/gcsebitesize/science/add_gateway_pre_2011/chemical/waterrev1.shtml www.londonair.org.uk/london/asp/information.asp www.environment.gov.au/resource/sulfur-dioxide-so2 www.who.int/bulletin/archives/80(10)768.pdf Topics covering:
Year 12 7.1 C Equilibrium constant and effect of change of temperature, pressure and concentration on equilibrium constant. 7.1.d Deduce expressions for equilibrium constants in terms of concentrations, Kc, and partial pressures, Kp Unit Test Topics: Energetics, Redox Reactions and Kinetics Date : Thursday 01-12-16 Year 11 Contact process for sulfuric acid Properties of dilute and concentrated sulfuric acid Unit Test Topic – Unit 11 Redox reactions Date: Wednesady 30-11-16 Year 10 Presentations on Air and Water Year 8 Revision for Term exam Term exam - Wednesday 30-11-16 Topics: Multiplying and dividing decimals, Changing fractions to decimals, changing fractions and decimals to percentages, finding percentages of quantities, simplifying ratios Topics covering
Year 12 Redox reactions and oxidation number Rate of reaction Collision theory and rate of reaction Year 11 Uses of Aluminium Electroplating and its applications Cells and production of energy Hydrogen fuel cell Year 10 Periodic trends Properties of group 1 elements Tests for water Year 8 Ratio and proportion- Unitary method for solving problems.
Describe changes of state in terms of melting, boiling, evaporation, freezing, condensation and sublimation 1(S)Explain changes of state in terms of the kinetic theory
3.1 State the relative charges and approximate relative masses of protons, neutrons and electrons Define proton number (atomic number) as the number of protons in the nucleus of an atom Define nucleon number (mass number) as the total number of protons and neutrons in the nucleus of an atom Use proton number and the simple structure of atoms to explain the basis of the Periodic Table (see section 9), with special reference to the elements of proton number 1 to 20 Define isotopes as atoms of the same element which have the same proton number but a different nucleon number 3.1(S)Understand that isotopes have the same properties because they have the same number of electrons in their outer shell 3.1 State the two types of isotopes as being radioactive and non-radioactive; State one medical and one industrial use of radioactive isotopes 6.2 Describe radioactive isotopes, such as 235U, as a source of energy 3.1 Describe the build-up of electrons in ‘shells’ and understand the significance of the noble gas electronic structures and of the outer shell electrons 3.1(S)Understand that isotopes have the same properties because they have the same number of electrons in their outer shell 3.2.1 Describe the differences between elements, mixtures and compounds, and between metals and non-metals 7.1 Identify physical and chemical changes, and understand the differences between them 3.2.1Describe an alloy, such as brass, as a mixture of a metal with other elements 10.1 Identify representations of alloys from diagrams of structure 3.2.2. Describe the formation of ions by electron loss or gain; Describe the formation of ionic bonds between elements from Groups I and VII 3.2.2(S)Describe the formation of ionic bonds between metallic and non-metallic elements; Describe the lattice structure of ionic compounds as a regular arrangement of alternating positive and negative ions 6.1 Describe the meaning of exothermic and endothermic reactions 9.1Describe the Periodic Table as a method of classifying elements and its use to predict properties of elements 9.2 Describe the change from metallic to non-metallic character across a period 9.2(S)Describe and explain the relationship between Group number, number of outer shell electrons and metallic/non-metallic character 4.1Use the symbols of the elements and write the formulae of simple compounds; Deduce the formula of a simple compound from the relative numbers of atoms present 9.3 Describe lithium, sodium and potassium in Group I as a collection of relatively soft metals showing a trend in melting point, density and reaction with water; Predict the properties of other elements in Group I, given data, where appropriate. Topics covering:
Year 12 AS Chemistry 5.1.a Enthalpy changes during chemical reactions 3.3.c Bond energy, bond length and bond polarity 5.1.b (i) and (ii) Enthalpies of reactions 5.1.c Calculating enthalpies of reactions Unit Test from units 1 and 2- Wednesday 16th November Year 11 IGCSE Chemistry Redox reactions Electrolysis Electrode products Year 10 IGCSE Chemistry Ionic bonding-Lewis representation Ionic lattice Alloys Exo- and endo-thermic reactions Unit Test – Unit 2- Particles , Atomic structure and Periodic Table- Wednesday, 16th November Year 8 Math Percentages Calculate and solve problems involving percentages of quantities and percentage increases or decreases; Express one given number as a fraction or percentage of another. |
Ms TessyYear 7-9 Global Studies Archives
May 2017
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