H F He G H H T (C) 88.32 88.28 88.31 88.28 Trial The boiling point of water was

Question

H F He G
H H
T (C) 88.32 88.28 88.31 88.28 Trial The boiling point of water was measured at sea level. Which statement best describes the quality of the data? 69. (A) The data have low precision and low accuracy. (B) The data have low precision and high accuracy (C) The data have high precision and low accuracy (D) The data have high precision and high accuracy. A student designs a series of experiments to determine the kinetic rate law for a reaction. 70. CH3COOH(aq) + Br2(aq) + HCl(aq) Products HCI 0.05 0.05 0.05 0.01 0.02 0.02 0.05 0.05 0.025 4 Which set of conditions is best for Experiment 4? (A) [CH3COOH] = 0.01; [Bral = 0.025, [HCl] = 0.05 (B) [CH3COOH] = 0.01; [Br] = 0.05; [HCl] = 0.10 (C) [CH3COOH] = 0.04; [Br] = 0.25; [HCl] = 0.05 (D) Sufficient data are present to determine the rate law.

Explanation / Answer

1) Since the results are approximately similar in all the experiments( with an error of +/-0.03), but since the boiling point of water at sea level i.e. at 1 atm pressure is 100 0C, therefore the results are not accurate

Hence the correct option is :- (a)

2) Let the rate of the reaction be :-

rate = k*[CH3COOH]a*[Br2]b*[HCl]c

Since there are 4 unknowns i.e. k,a,b,c but only 3 equations can be formed, therefore

The given data is insufficient

The best option for expirement 4 is :-

(B)

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