Unilt lest Unit Test Active

TIME REMAINING

01:22:52

Which shower would most likely be the control group in this

study?

Mildew is a fungus that grows in wet areas and can slowly

grow from microscopic to large stains in showers and sinks

Researchers are studying different sprays that could be used

to slow down the growth of mildew. They set up different

showers that are exactly the same and expose them each to

water with the same microscopic amount of mildew. They

then spray some showers with mildew-preventing sprays and

observe how fast mildew grows over time.

O the shower sprayed with many test sprays

the shower not exposed to any mildew at all

O the shower not sprayed with any mildew-preventing spray

O the shower sprayed with a test spray that is already

known to work

1.) which of the following is a molecule but not a compound? a.he b.f2 c.h2o d.ch4 2.) what is a physical combination of substances? a.a compound b.a molecule c.a mixture d.an element 3.) what is a chemical combination of substances? a.a compound b.an atom c.a mixture d.an element 4.) what is the relationship between the solute and solvent in a solution? a.they form a compound b.they form a mixture c.they form molecules d.they form chemical bonds 5.) the gases in air dissolve in water. what would be one way to reduce the amount of a gas dissolved in water? a.add more water b.reduce the air pressure c.increase the air pressure d.stir the water 6.) how would you determine the solubility of a substance? a.find how well it dissolved various substances. b.find the mass and the volume of the substance. c.find the temperature at which the substance evaporated. d.find how much i was able to dissolve in a solute. 7.) the periodic table organizes all of the kinds of a.molecules. b.compounds. c.atoms. d.ions. 8.)what distinguishes two substances combined to become a compound vs. two substances combined to become a mixture? a.whether they can be easily separated b.whether they chemically bond together c.whether they both are visible d.whether they are heterogeneous 9.) the principle components of air are: n2 78% o2 21% ar 0.95% co2 0.038% this is a solution of a.molecules and atoms. b.molecules. c.compounds and molecules. d.atoms.