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STPM Chemistry (Semester 2) -1 - STPM CHEMISTRY SEMESTER 2 PRE-EXAM PRACTICE
Section A: Structured Questions Answer all questions. 1 (a) Chrome yellow has been used for a long time as a yellow pigment in oil paintings. SO4 2-(aq) + 4H + (aq) + 2e ⇌ 2H2O(l) + SO2(g) E o = +0.17 V CrO4 2-(aq) + 8H + (aq) + 3e ⇌ 4H2O(l) + Cr 3+ (aq) E o = +1.33 V
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TITRIMETRIC MTHODS Titrimetric methods are widely used in chemistry to determine oxidants, reductants, acids, bases, metal ions, etc. Titration is based on a reaction between the analyte (unknown sample) and the regent of known concentration and reaction stoichiometry. The volume or mass of the reagent needed to react completely with a fixed quantity of the analyte is obtained from which the amount of analyte is determined. Titrimetric methods include powerful group of quantitative procedures that are based on measuring the amount of reagent consumed by the analyte. These methods include, i. Volumetric titrimetry. This involves measuring volume of solution of known concentration that is needed to react completely with the sample. The reagent of exactly known concentration is refered to as standard reagent. Titration is the process in which the standard reagent is added to a solution of the sample until the reaction is judged to be complete. Back titration is the process by which the excess of the standard solution used to consume the sample is determined by titration with a second standard solution. Equivalence point and end-point are confused to mean the same but they are totally different. Equivalence point is a point in titration when the amount of standard solution added is exactly equal to the amount of the sample whereas end-point is the point in titration when a physical change occurs that is associated with a condition of chemical equivalence. The two values are usually different and the difference gives the titration error. Indicators are added to the solution mixtures to produce an observable physical change at the end-point or near equivalence point ii. Gravimetric titrimetry. This involves measuring mass of reagent that reacts completely with the sample. iii. Coulometric titrimetry. Here the reagent is a constant direct electrical current of known magnitude that consumes the sample. Here the time is required, and the total charge to complete the electrochemical reaction
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EXPERIMENTAL LABORATORY MANUAL by discipline GENERAL CHEMISTRY for students of technical specialties, 2015
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STPM Semester 1 Chemistry Experiment 2 Volumetric Analysis - Acid Base and redox
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CHEMISTRY STPM SEM 2 OVERALL - short notes FROM CHEMISTRY TEACHER ALICE HII. CHEMISTRY STPM SEM 2 OVERALL - short notes FROM CHEMISTRY TEACHER ALICE HII. Zoom In. Thumbnails. Auto Flip. First. Previous Page. Next Page. Last. Social Share. More Options. Search. Search. Ads ...
Good afternoon everyone. I am back. As usual, every time when STPM is around the corner, I will be giving an online session for answering techniques session ...
Experiment 2: Acid-Base Titration - Determination Of The Concentration Of Hydrochloric Acid Solution. ... STPM 2022 - 962/2/P. Section A [15 marks] Answer all questions in this section. The standard enthalpies of combustion for H 2 , C 6 H 10 and C 6 H 12 are - 286 kJ mol- 1 , - 3754 kJ mol- 1 and - 3920 kJ mol- 1 respectively ...
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The Chemistry practical syllabus for STPM should achieve its objective to improve the quality of. students in the aspects as listed below. (a) The ability to follow a set or sequence of instructions. (b) The ability to plan and carry out experiments using appropriate methods.
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Chemistry STPM Sem 2 (definition) The standard enthalpy of formation of a compound. Click the card to flip 👆. The heat change when 1 mol of the compound is formed from its elements under standard conditions. Click the card to flip 👆. 1 / 33.
Transition element. Element that could form at least one stable simple ion with partially filled d-orbitals. Complex ion. Consists of central metal ion bonded by atoms, molecules or ions called ligands through coordinate bonds. Homogeneous catalysis (keyword 1) Reactants and catalyst are in the same phase. Homogenous catalysis (keyword 2)
NS 11 - 11 - STPM Chemistry (Semester 2) 10 (a) Carbon dioxide and nitrogen dioxide are gaseous combustion products of liquid hydrocyanic acid, HCN at 298 K and 1 atm. Water is also formed in the combustion. (i) Define the standard enthalpy change of combustion of hydrocyanic acid. Write a thermochemical equation for this enthalpy change.
Stpm Chemistry Practical Experiment 2 2012 [pqn87rdxek41]. ... IDOCPUB. Home (current) Explore Explore All. Upload; Login / Register. ... Stpm Chemistry Practical Experiment 5 2012 Semester 1 October 2019 100. Stpm Experiment 9 Electromagnetic Induction October 2019 765. Our Company. 2008 Columbia Road Wrangle Hill, DE 19720
Stpm Physics Experiment 10 Reactance Of A Capacitor (second Term) Preview. Full text. Our Company. 2008 Columbia Road Wrangle Hill, DE 19720. +302-836-3880. [email protected]. Quick Links.
Here are the answers to the experiment. Report Day : Date : Topic : Volumetric Analysis - Stoichiometry Purpose : To determine the exact concentration of a monobasic acid, HX Apparatus : 250 cm3 volumetric analysis with stopper, 25.0 cm3 pipette, 50.00 cm3 burette, retort stand with clamp, filter funnel, glass rod, pipette pump, electronic balance, conical flask, 50 cm3 beaker, dropper ...