Question Library

You are provided with a beaker, a thermometer, a stirrer Stopwatch/clock, measuring cylinder, table salt, water, and other necessary materials. i. You Measure 200cm\(^{3}\) of water into the beaker. ii. Heat the water until it boils steadily for about 2 minutes. iii. Read and record the boiling point \(b_0\). iv. Add table salt of mass M = 10.0 g to the boiling water and stir continuously until another boiling point \(b_1\) is attained. v. Read and record \(b_i\). vi. Evaluate \(\theta_{i}\) = (\(b_i\) - \(b_0\)) vii. Using the same mixture, repeat the procedure four more times by adding 10.0 g of salt each time to give the cumulative mass \(M_i\) of salt as 20 g, 30g, 40g, and 50g. viii. In each case allow the mixture to boil steadily for at least 2 minutes then read and record the boiling point b. ix. Tabulate your readings. x. Plot a graph with \(M_i\) on the vertical axis and \(\theta_{1}\) on the horizontal axis. xi. Determine the slope, s, of the graph. xii. State two precautions taken to ensure accurate results. (b) i. Define the boiling point of a liquid. ii. What effects do impurities have on the boiling point of a liquid?

You are provided with cells, a potentiometer, an ammeter, a voltmeter, a bulb, a key, a jockey, and other necessary materials. i. Measure and record the e.m.f E of the battery. ii. Set up a circuit as shown in the diagram above. iii. Close the key K and use the jockey to make a firm. iii. Contact at J on the potentiometer wire such that PJ = x= 10cm. iv. Take and record the voltmeter reading V and the () Corresponding ammeter reading. v. Evalute log V and log I. vi. Repeat the procedure for five other values of x = 20 cm, 30 cm, 40 cm, 50 cm, and 60 cm. vii. Tabulate your readings. viii. Plot a graph with log I on the vertical axis and log V on the horizontal axis. ix. Determine the slope s, of the graph. x. Determine the intercept, c, on the vertical axis. xi. State two precautions taken to ensure accurate results. (b)i. How is the brightness of the bulb affected as x increases? ii. List two electrical devices whose actions do not obey Ohm's law.

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In the laboratory preparation of ethyl ethanoate, the water present in the mixture is removed using ?

The constituent of air necessary in the rusting process are

For a general equation of the nature xP + yQ → mR + nS, the expression for the equilibrium constant is

A given mass of gas occupies 2dm3 at 300k. At what temperature will its volume be doubled, keeping the pressure constant?

The oxidation number of iodine in KIO3 is