The APsolute RecAP: Chemistry Edition - Episode 55: Unit 4 Selected FRQs
Description
Unit for is a mix of foundational skills, like stoichiometry, and an introduction to later topics (0:32 ). The questions in this episode are: 2018 - Question 3 d) through i) and 2014 - Question 1 a) - f).
These are released FRQs from previous exams and copyright of the College Board (1:32 ). 2018 starts with three questions from a different unit. Part d) asks for a redox reaction (2:05 ). In part e) you are asked to calculate the concentration of iron(ii)plus in the solution (2:36 ) and in f) to discuss lab equipment (3:58 ). G) and i) refer to a second experiment involving iron impurities (4:39 ) and the effect of incomplete oxidation (5:34 ). Question 1 from 2014 is a gravimetric analysis with the goal of determining the iodide content in a potassium iodide tablet (7:00 ). Therefore we write the net-ionic equation (7:22 ), reflect on our data (7:52 ) and ion concentrations (8:06 ) before we calculate the number of moles of precipitate (8:23 ) and percentage iodide (8:53 ). Part f) concludes with a question about a potential error (9:38 ).
Question: True or false: You MUST indicate the state of matter in parentheses in your balanced chemical equation, even if not asked for it.
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