Which phrase best describes a period on the periodic table? a. elements that are in the same group

b. elements that have the same number of electrons

c. a column of elements

d. a row of elements

Butadiene undergoes a reaction at a certain temperature in the gas phase as follows: 2c4h6(g) --> c8h12(g) the following data were collected for this reaction: time (min) [c4h6] (m) 0 0.36 15 0.30 30 0.25 48 0.19 75 0. determine the order of the reaction and the rate constant. 1st order and k = 4.3x10 -4 s-1 1st order and k = 2.3x10-4 s-1 2nd order and k = 4.3x10-4 s-1 2nd order and k = 2.3x10-4 s-1 zero and k = 4.3x10-4 s-1

Which of the following is in the lanthanide family? a) uranium b) promethium c) silver d) gold

What are the names of these two interactions with cattle and how do they differ from each other