The temperature dependence of the reaction rate is usually expressed as follows: k = k. rt where k is the reaction rate constant; ko is a pre-exponential constant, e is the activation energy, r is the universal gas constant and t is the absolute temperature. however, the following expression is used for the bod (biochemical oxygen demand) test: kt, = kt, (o)(t3-t; ) a) show that a = ert, i and thus 0 is a function of t, and t2 b) determine the activation energy, e, if e = 1.047 and t2 =293 k and t = 273k

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water pollution kills aquatic life. aquatic life includes algae and other plant life that use photosynthesis. photosynthesis takes   c02 out of the air.  

c02is a greenhouse gas.

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.  

you need to stop taking that class