If Iron has a density of 7.87 g/ml (cm) and Lead is 11.3 g/ml (cm). Using this information, please identify an unknown substance that has a volume of 6.7 cm'and a mass of 75.7 8. What is this
unknown?

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

What are transitions between a liquid and gas called? identify which way they are transitioning

An observation that requires measurement is called quantitative observable or qualitative