7. Draw a picture showing the markings (graduations) on glassware that would allow you to make each of the following volume measurements.
a. 128.7 mL
b. 18 mL
c. 23.45 mL

a:

by the combination of an unlimited number of elements

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.