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We often need to heat reactions to make them go faster or in some cases they will not happen at all without heat. Sometimes we may need to heat a reaction for several hours or even days. Why do we need to use a reflux set up instead of simply heating our reaction mixture in an open flask though? Select all that apply Question 4Select one or more: a. To maintain the solvent volume and avoid boiling the reaction dry b. To avoid the escape of flammable solvent vapours into the atmosphere which could cause a fire c. To stop the reaction from getting too hot d. To make the reaction go faster e. To stop impurities forming in the reaction f. To stop any volatile reagents or products from boiling off and being lost

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Courses Calendar Inbox Multiple Choice 2.7 points When you buy a hotdog for lunch, you are using money as a store of value. standard of deferred payment. medium of exchange. unit of accounting

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What are some common characteristics between the ancient sages in the Greek, Indian, and Chinese traditions

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All of the following are administered rates of the Federal Reserve except: Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a the discount rate. b the federal funds rate. c the interest on reserve balances rate. d the overnight reverse repurchase agreement offering rate.

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Consider the following competing hypotheses and accompanying sample data. Hg1-=7 HA-27 = 55 51 = 21.8 n =23 2 = 33 $2 = 15.5 n2 =19 Assume that the populations are normally distributed with equal variances. a-1. Calculate the value of the test statistic.(Round final answer to 3 declmal places.) Test statistic a-2. Find the p-value. O 0.02 p-value < 0.05 O 0.05 p-value < 0.10 O p-value > 0.10 O p-value < 0.01 O 0.01 p-value < 0.02 b. At the 5% significance level, can you conclude that the difference between the two means differs from 7? H0. At the 5% significance level, we conclude that the difference between the means differs from 7.

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2.1 A Schering-bridge was used to determine the dielectric constant and loss factor of a 1 mm thick Bakelite sheet at 50 Hz using a parallel-plate electrode configuration. The electrode effective area is 100 cm2. At balance, the bridge arms are AB: test object, BC: std, capacitor = 100 pF. CD: variable capacitor in parallel with resistor 50 nF and 1000/π Ω DA: variable resistance 62.0 Ω. Determine the dielectric constant K and loss factor tan β. (10) 2.2 A lightning surge incident on an overhead transmission line of impedance 800 Ω approaches a substation through a cable of impedance 80 Ω. Determine what portion of the lightning surge voltage reaches the substation equipment. (5)

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What will this code snippet print? Be exact. int snake = 3; int lizard = 4; float fish = 5; printf("%d", snake/lizard);

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#2. Consider the function $f(x) = x^3 - 3x^2 - 3x^2 + 10x - 24$ on the following interval $[-3, 5]$. a) List all local maxima of this function. Give your answer(s) as an ordered pair(s). If there are no such points, write NONE. (2 pts) b) List all local minima of this function. Give your answer(s) as an ordered pair(s). If there are no such points, write NONE. (2 pts) c) What is the global maximum of this function? What is the global minimum of this function? Give your answers as ordered pairs. (4 pts) d) Sketch the function. (4 pts)

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(1) NH2OH, cat. HA (2) NaBH3CN

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5.2. Arc Security Systems Ltd has set its base level of sales at 7 200 units. Its selling price is R144.55 per unit, the variable cost is R15.55 per unit and the total fixed costs are R28 000.00 Required: 5.2.1. Calculate Arc's operating break-even point (in units) and its degree of operating leverage (DOL). Show all your calculations and round off the final answer to TWO decimals. 5.2.2. Explain what the DOL calculated in 5.2.1 means. (12) (5) SPECIAL EXAMINATION TOTAL: [135] Pane 9 of Assignment

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kimberly a.