Question

What is the answer to part (b), not in scientific notation?

Additional Exercise 13.123 The rate at which crickets chirp depends on the ambient temperature, because crickets are cold blooded insects whose body temperature follows the temperature of their environment. It has been found that the Celsius temperature can be estimated by counting the number of chirps in 8 seconds and then adding 4. In other words, te= (number of chirps in 8 seconds) + 4. Correct (a) Calculate the number of chirps in 8 seconds for the temperature 35°C. 131 chirps SHOW HINT SHOW SOLUTION X Incorrect. (b) The number of chirps per unit of time is directly proportional to the rate constant for a biochemical reaction involved in the cricket's chirp. On the basis of this assumption, make a graph of In(# of chirps) versus (1/7). Calculate the activation energy for the biochemical reaction involved using the values of temperature 20°C and 35°C. 33082.65 J/mol SHOW HINT Correct (c) How many chirps would a cricket make in 8 seconds at a temperature of 45°C? 41 chirps

Answer 1

a)T = 35,number of chirps= 35-4 = 31

b)My obtained answer is quite close to your answer,it should be on the part of teacher to consider an error margin of 10% atleast as graphs could differ when made by hand as you cannot estimate the least square curve properly.

c)T= 45 C

T(°C) Chirps % (K) Gc-axis) 3.418 10-3 Incherps (y-axis) 2.77 3.35x10-3 3.05 3.26 30 3. 30x 10-3 26 35 3.43 31 3.24 x 10-3 to get the Putting the values in calculator straight line. (regresion) as lnk= to - Fax - 72 slope ink= 16.12 – 396706 39076 - Ea R Ea = 3907.6X8.314 32487.78 J/mol.

Number of chirps = 45-4=41