Topic 1 Review. Ms. Kiely Coral Gables Senior High IB Chemistry SL
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1 Topic 1 Review Ms. Kiely Coral Gables Senior High IB Chemistry SL
2 Bell-Ringer A 4 g sample of sodium hydroxide, NaOH, is dissolved in water and made up to 500 cm³ of aqueous solution. What is the concentration of the resulting solution? A. 0.1 mol dm ³ B. 0.2 mol dm ³ C. 0.5 mol dm ³ D. 1.0 mol dm ³ PERIOD 6: TOPIC 1, PART 9 SLIDES COMPLETE PV=nRT & VOLUME STOICHIOMETRY
3 Answer A 4 g sample of sodium hydroxide, NaOH, is dissolved in water and made up to 500 cm³ of aqueous solution. What is the concentration of the resulting solution? B. 0.2 mol dm ³ 4 g NaOH x 1 mol NaOH = 0.1 mol NaOH g NaOH Concentration = number of moles of solute = 0.1 mol NaOH = 0.2 mol dm ³ volume of solution in dm³ dm³
4 NEXT CLASS: TEST Exams in this class generally mimic the IB exam. 2nd and 6th period: Next class you will be given a test with both Papers 1 and 2. YOU MAY USE A CALCULATOR ON PAPER 2 ONLY.
5 Practice (i) Write an equation for the reaction between hydrochloric acid and calcium carbonate. (2) (ii) Determine the volume of 1.50 mol dm ³ hydrochloric acid that would react with exactly 1.25 g of calcium carbonate. (3) (iii) Calculate the volume of carbon dioxide, measured at 273 K and ⁵ Pa, which would be produced when 1.25 g of calcium carbonate reacts completely with the hydrochloric acid. (2) (Total 9 marks)
6 Answer (i) 2HCl(aq) + CaCO3(s) CaCl2(aq) + CO2(g) + H2O(1); [1] for correct formulas, [1] for balanced, state symbols not essential. (ii) volume of HCl = dm³ OR 16.7 cm³ (iii) 1:1 ratio of CaCO₃ to CO₂ /use moles CO₂ ( ) = 0.28 dm³/280 cm³/ ⁴m³
7 Practice A toxic gas, A, consists of 53.8% nitrogen and 46.2% carbon by mass. At 273 K and ⁵ Pa, g of A occupies 462 cm³. Determine the empirical formula of A. Calculate the molar mass of the compound and determine its molecular formula.
8 Answer Empirical formula = CN Molar mass = 50.9 g/mol Molecular formula = C₂N₂
9 Practice Assuming complete reaction, what volume of mol dm ³ HCl(aq) is required to neutralize 25.0 cm³ of mol dm ³ Ba(OH)₂(aq)? 2HCl + Ba(OH)₂ BaCl₂ + 2H₂O A cm³ B cm³ C cm³ D cm³
10 Answer Assuming complete reaction, what volume of mol dm ³ HCl(aq) is required to neutralize 25.0 cm³ of mol dm ³ Ba(OH)₂(aq)? 2HCl + Ba(OH)₂ BaCl₂ + 2H₂O A cm³ B cm³ C cm³ D cm³
11 Practice Ethyne, C₂H₂, reacts with oxygen according to the equation below. What volume of oxygen (in dm³) reacts with 0.40 dm³ of C₂H₂? 2C₂H₂(g) + 5O₂(g) 4CO₂(g) + 2H₂O(g) A B C. 1.0 D. 2.0
12 Answer Ethyne, C₂H₂, reacts with oxygen according to the equation below. What volume of oxygen (in dm³) reacts with 0.40 dm³ of C₂H₂? 2C₂H₂(g) + 5O₂(g) 4CO₂(g) + 2H₂O(g) A B C. 1.0 D. 2.0
13 Practice What volume of mol dm ³ sulfuric acid solution is required to react completely with 10.0 g of calcium carbonate according to the equation below? CaCO₃(s) + H₂SO₄(aq) CaSO₄(aq) + H₂O(l) + CO₂(g) A. 100 cm3 B. 200 cm3 C. 300 cm3 D. 400 cm3
14 Answer What volume of mol dm ³ sulfuric acid solution is required to react completely with 10.0 g of calcium carbonate according to the equation below? CaCO₃(s) + H₂SO₄(aq) CaSO₄(aq) + H₂O(l) + CO₂(g) A. 100 cm3 B. 200 cm3 C. 300 cm3 D. 400 cm3
15 Practice
16 Answer
17 Practice
18 Answer
19 Practice
20 Answer
21 Practice Problems: 1. A solution of water and ammonia contains 2.10 x 10²³ molecules of H₂O and 8.00 x 10²¹ molecules of NH₃. How many moles of hydrogen atoms are present? 2. How many grams does 5.60 x 10²² molecules of SiO₂ weigh? 3. How many molecules are there in 21.6 grams of CH₄?
22 Answers: 1) mol H atoms 2) 5.59 grams 3) 8.10 x 10²³ molecules
23 Practice Consider the following reaction. N₂(g) + 3H₂(g) 2NH₃(g) If the reaction is made to go to completion, what volume of ammonia, NH₃, (in dm³) can be prepared from 25 dm³ of nitrogen and 60 dm³ of hydrogen? All volumes are measured at the same temperature and pressure. A. 40 B. 50 C. 85 D. 120
24 Answer Consider the following reaction. N₂(g) + 3H₂(g) 2NH₃(g) If the reaction is made to go to completion, what volume of ammonia, NH₃, (in dm³) can be prepared from 25 dm³ of nitrogen and 60 dm³ of hydrogen? All volumes are measured at the same temperature and pressure. A. 40 B. 50 C. 85 D. 120
25 Practice Problems 1. What is the number of moles in 501 dm³ of He gas at STP? 2. What volume is occupied by 1.34 x 10²³ molecules of water vapor at STP? 3. How many atoms are in 32.5 dm³ of oxygen gas?
26 Answers: 1) 22.1 mol 2) 5.05 dm³ 3) 1.72 x 10²⁴ atoms
27 Practice
28 Answer
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