EJC 2023 The Mole Concept and Stoichiometry

2023 JC1 H2 CHEMISTRY (9729) CORE IDEA 3: TRANSFORMATION Topic 1: THE MOLE CONCEPT & STOICHIOMETRY Name: ___________________________________________ Civics Group: _________ The use of the Data Booklet is relevant for this topic. Please have a copy with you as you attend the lectures. Please note that Sections 1, 2, 3, 4.1 , 5.2 & 5.3 involve concepts which have been covered at the secondary school level. Please read through these areas on your own and refresh your concepts before the lectures. Another independent study segment, Section 6.7, will be covered in greater detail in your practicals or later topics. [the term relative formula mass or Mr will be used for ionic compounds] Students should be able to: (a) define the terms relative atomic, isotopic, molecular and formula mass (b) define the term mole in terms of the Avogadro constant (c) calculate the relative atomic mass of an element given the relative abundances of its isotopes (d) define the terms empirical and molecular formula (e) calculate empirical and molecular formulae using combustion data or composition by mass (f) write and/or construct balanced equations (g) perform calculations, including use of the mole concept, involving: (i) reacting masses (from formulae and equations) (ii) volumes of gases (e.g. in the burning of hydrocarbons) (iii) volumes and concentrations of solutions [when performing calculations, candidates’ answers should reflect the number of significant figures given or asked for in the question] (h) deduce stoichiometric relationships from calculations such as those in (g) From the topics of Electrochemistry & Transition Elements Chemistry: (i) describe and explain redox processes in terms of electron transfer and/or of changes in oxidation number (oxidation state); (j) construct redox equations using the relevant half-equations (k) describe and exp lain the use of Fe 3+/Fe2+, MnO4–/Mn2+ and Cr2O72–/Cr3+ as examples of redox systems REFERENCES 1. Chemistry (for CIE AS & A Level) by Peter Cann & Peter Hughes (540 CAN) 2. Chemistry: The Molecular Nature of Matter & Change by Martin S. Silberberg (540 SIL) 3. Calculations in A Level Chemistry (4th Edition) by E.N. Ramsden 4. Calculations for AS/A Level Chemistry by Jim Clark

T h e M o l e C o n c e p t & S t o i c h i o m e t r y E u n o i a J u n i o r C o l l e g e 2 | P a g e LECTURE CONTENT 1 Relative Masses of Atoms and Molecules (INDEPENDENT STUDY) ................................ .... 3 1.1 Relative Isotopic Mass (no unit) ................................ ................................ .......................... 3 1.2 Relative Atomic Mass (symbol: Ar, no unit) ................................ ................................ ......... 4 1.3 Relative Molecular Mass (symbol: Mr, no unit) ................................ ................................ .... 5 1.4 Relative Formula Mass (symbol: Mr, no unit) ................................ ..