Watson and Crick used pieces of wire, plastic spheres, chemical knowledge, and an x-ray image of a
deoxyribonucleic DNA molecule to determine that DNA has
a double helix structure. Which process of science were
they most likely using?
o publishing results
o repeating an experiment
o constructing a model
. developing procedures

Amixture that has two or more substances that are spread out evenly is called a. compound b. heterogeneous c. substance d. homogeneous

)benzene and toluene form nearly ideal solutions. consider an equimolar solution of benzene and toluene. at 20 °c the vapour pressures of pure benzene and toluene are 9.9 kpa and 2.9 kpa, respectively. the solution is boiled by reducing the external pressure below the vapour pressure. calculate (i) the pressure when boiling begins, (ii) the composition of each component in the vapour, and (iii) the vapour pressure when only a few drops of liquid remain. assume that the rate of vaporization is low enough for the temperature to remain constant at 20 °c.

50 points! need answer asap. what type of organic compound contains the following functional group? (2 points)