Which items did Mendeleev write down on note cards while he was observing
different elements?
Check all that apply.

A. Density
B. Atomic mass
C. Buoyancy
D. Color

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

Identify the electromagnets with poles that are reversed from the electromagnet shown above

How many moles of kci are produced from 2.50 moles k