Which of the following is NOT an example of a pure substance?
A. an element on the periodic table
B. a compound made up of chemically-bonded
elements
C. a glass of salt water

Asolution contains 225 g of sodium chloride, nacl, dissolved in enough water to make a 0.25 l of solution. what is the molarity of the solution? a. 3.88 m, b. 1.03 m, c. 1.5 m, d. 15.5 m

If you have 5.25 grams of methane (ch4), how many grams of co2 will you produce ?

Which statement is usually true about the relationship between activation energy and reaction rates? low activation energy barriers result in low rates. high activation energy barriers result in low rates. low activation energy barriers result in no reaction. high activation energy barriers result in no reaction.