Relative humidity of a sealed flask of air can be changed by changing the air s temperature or by
a. shining light on the flask.
b. adding or removing water vapor.
c. bringing the flask to a different latitude.
d. adding or removing particles of soil.

You are making a solution of calcium chloride dissolved in water. you add solid, stir, and it dissolves. you add just a spatula tip full, stir, and the solid does not dissolve. how could you describe the solutions before and after adding the spatula tip amount

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?