If the density of an individual crystal of polyethylene (PE) is 0.983 g/cm3 and the density of totally amorphous polyethylene (PE) is 0.869 g/cm3, determine the fraction of crystallinity of a PE sample having density of 0.950 g/cm3 at the same temperature, (a) based on mass fraction, and (b) based on volume fraction.

The kw for water at 0 °c is 0.12× 10–14 m2. calculate the ph of a neutral aqueous solution at 0 °c.

Some molecular compounds, such as hcl, ionize completely in solution. for molecular compounds such as h2co3, most molecules do not ionize in solution. which describes the properties of these two solutes? a. hcl and h2co3 have the same effect on the properties of the solution. b. hcl raises the freezing point of water more than h2co3 does. c. hcl raises the boiling point of water more than h2co3 does.

As light moves from one material into the next, which of the following affects how much the light waves will refract, or bend? angle at which the ray strikes the medium color of the material density of the material temperature of the light wave