rates-reaction-handout

rates-reaction-handout - 2. What units are associated with...

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Rates of reaction • Read 18.1 pg. 737-738 • Demonstration of variations in reaction rates: Ca vs. Na vs. Li in water to produce H 2 gas Flour burning in air 8H + + C 2 O 4 2- + MnO 4 - Mn 2+ + 4H 2 O + CO 2 H 2 SO 4 , H 2 C 2 O 4 (oxalic), KMnO 4 provide ions • From the list predict the fastest (1) to slowest (4) 0.5 M oxalic acid 1.0 M H 2 SO 4 water Other a 2.5 mL 2.5 mL 5.0 mL b 2.5 mL 2.5 mL 5.0 mL at 60 ° C c 2.5 mL 2.5 mL 5.0 mL + manganous sulfate d 2.5 mL 5.0 mL 2.5 mL Examples of factors affecting rate • Read 18.2. For each of the 5 factors give one example from today’s demonstrations • Nature of reactants • Ability of the reactants to meet • The concentration of the reactants • The temperature of the system • The presence of catalysts Measuring Reaction Rates Read 18.3 (740 – 42). Answer these questions: 1. What units are associated with concentration?
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Unformatted text preview: 2. What units are associated with reaction rate? 3. What do the square brackets in [HI] indicate (see figure 18.2, pg. 741) 4. Expalin how the rate of a reaction is determined (see fig. 18.2)? 5. Plot this data (include title, axes labels): 50 0.072 100 0.056 150 0.046 200 0.039 250 0.034 300 0.030 0.100 350 Time (s) 0.026 [HI] Measuring Reaction Rates 6. For the data, determine the rate of reaction at i) 25 s, ii) 175 s, and iii) 325 s. Show your work and calculations on the graph. 7. How does the rate at the beginning of a reaction compare to the rate later in a reaction? Explain why this makes sense according to one of the 5 factors that affect reaction rates (from 18.2)? 8. Explain how the rate of reaction of 2HI → H 2 + I 2 is determined experimentally. 9. Do PE 2 (pg. 742)...
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This note was uploaded on 04/12/2011 for the course CHEM 1010 taught by Professor Marshall during the Spring '11 term at North Texas.

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