Which of the following is best described by the term macroscopic? A. Water in the liquid phase boils to become a gas.
B. Water molecules in the solid phase are tightly held together.
C. H2O
D. Water is composed of two hydrogen atoms and one oxygen atom.

A

Explanation:

Since macroscopic means visible to the naked eye without a microscope it would be A. This is because we can see active phase changes in real time without any magnification like water boiling or ice melting.

the answer is

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.