AP Chemistry Final Exam Review ESSAY. Write your answer in the space provided or on a separate sheet of paper. 1) Explain the difference between a qualitative and a quantitative measurement. Provide examples to illustrate this difference. Answer: A qualitative measurement is a measurement that gives descriptive‚ nonnumeric results; a quantitative measurement is a measurement that gives definite‚ usually numeric results. "The rock is heavy" would be a qualitative measurement. "The rock weighs 110
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Mg(NO3)2(aq) 2 NaNO3(aq) + Mg(OH)(s) Observations: The solution turned slightly cloudy. Reaction #6A: Na2SO4(aq) + BaCl2(aq) Na2Cl2(l) + BaSO4(s) Observations: The solution turned white and cloudy. Reaction #7A: Na2SO4(aq) + Cu(NO3)2(aq) CuSO4(aq) + 2NaNO3(aq) Observations: The solution was slightly tinted blue due to the copper‚ but it
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diffuse evenly throughout. Copper sulphate- blue crystals‚ hydrated because they have water trapped within them. When they are heated this water evaporates‚ the crystals become dehydrated and turn white. Equation for this Reaction. CuSo4 5H2O ---> CuSo4 + 5H2O Solute- Solid which is dissolving Solvent- liquid in which the solute dissolves Solution- the solute and solvent mixed together Sodium hydroxide- Soluble Copper Oxide- insoluble Calcium hydroxide- Insoluble Silver iodide-
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EXPERIMENT 2 Stoichiometry Introduction Stoichiometry is the study of the quantitative relationships in chemical reactions. By studying stoichiometry‚ you can calculate the quantity of reactants that will be consumed in a chemical reaction‚ and the amount of product produced. Consider the reaction of vinegar with baking soda. As you may know‚ this reaction produces carbon dioxide gas which bubbles out of the vinegar. But if you want to know how much gas would be produced from combining a teaspoon
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Recrystallization of Benzoic Acid Objective To purify benzoic acid by recrystallization and gain experience with a basic organic laboratory techniques. Background Products of chemical reactions are often contaminated with impurities. One method for purifying chemicals‚ recrystallization‚ takes advantage of the differences in the solubilities of the desired products and the impurities and the tendency for the slow formation of crystals to exclude impurities from the crystalline solid. HC HC
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0 Cu Objectives n To observe a sequence of chemical reactions starting and finishing in elemental copper metal‚ and to practice quantitative laboratory techniques. Cu → Cu(NO3)2 → Cu(OH)2 → CuO → CuSO4 → Cu Cu(NO3)2 = copper nitrate Cu(OH)2 = copper hydroxide CuSO4 = copper sulfate CuO = copper oxide Experiment 1(a) Cu + 4HNO3 → Cu(NO3)2 + 2NO2↑ + 2H2O NO2 given off as a coloured gas* H(NO)3 Transfer contents to beaker containing 100 mL of water Cu 100mls H2O
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Mass of crucible Mass with cuSO4 Mass after heating Difference in mass 29.50 34.50 32.66 1.84 30.40 35.40 33.56 1.84 26.37 31.37 29.54 1.83 29.50 34.50 32.66 1.84 Moles of water = mass/mr = 1.84/18 =0.102 CuSo4 moles = mass/mr = (5 - 1.84)
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Determining an Enthalapy Change of Reaction Purpose of Experiment The purpose of this experiment is to determine the enthalapy change for the displacement reaction: Zn(s) + CuSO4(aq) Cu(s) + ZnSO4(aq) Hypothesis With this experiment I can also not make a hypothesis‚ because we did actually not do the experiment‚ but we were told that the temperature would make a sudden drop ‚ but we can measure the ΔT of the surrounding. The reaction is endothermic because the system will take in energy
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groups). The groups reduce CuSO4‚ a component of Benedicts‚ resulting in a color change in the benedicts solution from a turquoise to a brick to rusty-brown color. Another class of carbohydrates called starches‚ a polysaccharide‚ can be detected using the Iodine’s test. Having a high molecular weight‚ iodine attaches to the helical structure of starches yielding a blue-black precipitate. The Biuret’s test identifies proteins by oxidizing 4-6 peptide bonds of a protein using CuSO4 and NaOH resulting in
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dissolve in the water that they absorbed Efflorescent: compounds that lose their hydration when placed in a dry environment 3. Write a balanced equation for the reaction that will take place in this experiment. What type of reaction is it? CuSO4 x 5H2O = CuSO4 + 5H2O Decomposition Reaction 4. Calculate the
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