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Analysis by Mass Chapter 2
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Unit 3 Consists of Area of Study 1 Chemical analysis Area of Study 2 Organic Chemical Pathways Each area of study will take about a term Though hopefully quicker There are 3 sacs and 1 exam a semester
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The Exam This is what you are working towards. The chemistry unit 3 exam is on June 10 th It consists of 15 minutes reading time and 1.5 hours writing time. It is made up of 20 multiple choice questions and about 8 short answer questions You get a data booklet and are allowed a scientific calculator (no graphics)
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The S.A.C.s There are 3 S.A.C.s in unit 3 The first one is in Area of Study 1 This is the extended experimental investigation (E.E.I.) This will begin in week 6 (Mar 9) and will take about 3 weeks. It consists of 3 practical activities, questions to be answered on each prac, risk assessments to be written for each prac, a report to be written on all 3 pracs. The E.E.I. will be on the analysis of the composition of lawn fertiliser
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The next two S.A.C.s will be in area of study 2. One will be a practical report One will be a response to written stimulus The S.A.C.s
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Significant Figures All your answers to calculations this year must be to significant figures. Look at page 470 (Appendix 1) A zero that comes before integers in not significant but a zero that comes after an integer is. Significant figures is where your final value you calculate is only as precise as your least precise piece of data. Meaning your answer has to use the lowest amount of significant figures that the question contains.
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So lets review the holiday homework What is the difference between qualitiative and quantitative analysis? What are some analysis techniques and why might we use them? Look at page 12 worked example and answer question 1 on page 12. Remember % by mass is: Do questions 3 and 5 page 12 Final mass of sample Initial mass of sample x 100
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Empirical Formula Simplest whole number ratio of the atoms present in the compound Step 1: Measure the mass (m) of each element in the compound Step 2: Calculate the amount in mole (n) of each element in the compound Step 3: Calculate the simplest whole number ratio of moles of each element in the compound Step 4: Determine the empirical formula of the compound
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Molecular Formula Gives the actual number of atoms of each element present in a molecule of compound One unit can be the empirical formula molecular mass = molar mass of compound molar mass of one unit
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Stoichiometry What equations do we know?? Page 21 Lets do question 21 together.
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Homework P.12 Q 1, 3, 5 P.25 Q 21, 25, 27, 29, 31 P. 26 Q 36, 41, 42, 44
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