Scenario #4: Ethan filled 10 cups of the same size with equal amounts of water. He divided the cups into five groups of two cups each. The groups were placed in five
different locations around his house. After two weeks, he measured the remaining water
to determine how much had evaporated, by measuring how much water remained in
each cup
Parts of the Experiment
Independent variable
Dependent variable
The amount of water evaporated
Experimental control?
Constants (Factors
monitored to prevent
introducing another
independent variable)

How do dying stars contribute to the formation of planets

)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.

Which reason best explains why metals are malleable? a)because they have delocalized electrons b)because they have localized electrons c)because they have ionic bonds d)because they have rigid bonds