A2.00 l container of gas has a pressure of 1.00 atm at 300 k. the temperature of the gas is halved to 150k, and the measured pressure of the same 2.00 liter sample is 0.420 atm. which of the following is the best explanation for these observations? a. pressure is proportional to temperature for a fixed volume of gas. b. the molecules of the gas occupy a significant portion of the volume. c. the molecules of the gas have negligible volume of their own. d. the molecules have significant attractive forces at 150 k. e. the gas is closer to an ideal gas at 150 k.

Which sentence best describes the formation of igneous rock? a- lava on the surface dries up and makes arock b_melted rocks cools and forms crystals c_rocks under tremendous heat and pressure d_magma is melted rock underground

The scheme below is from a series of reactions that are part of a synthesis of vitamin a. answer the following questions with reference to this scheme. (i) what is "reagent a"? (ii) draw a step-by-step mechanism which explains the formation of compound c from compound b (iii) which reagents would you use to form compound e from compounds c and d (reagents b and c)? for each reagent suggested above in (ii) explain the role of the reagent in the reaction to (iv) form compound e. you may wish to do this by drawing a mechanism. 1. addition of reagent a но reagent a 2. н,о" thо oh нон-с compound a. compound b. compound c .ch-оh 1. reagent b "сно 2. reagent c сh oh compound e. compound d.

Ahypothesis must be testable and falsifiable to be considered scientific a. trueb. false