Question

1. what is the definition of a hydrophobic substance and give an example.
2. what is buoyancy? define this...
3. what is the average salinity of the oceans?
4. how does compactness of water molecules affect their properties? describe (solid, liquid, gas)
5. water is the only substance on earth that occurs ______________ in solid, liquid and gas forms.
6. each hydrogen atom shares an electron with the oxygen through what type of bond ______________.
7. list the biogeochemical cycles and give a short description of each.

Explanation:

The questions are about water properties, ocean salinity, chemical bonds, and biogeochemical cycles, which fall under Natural Science, specifically Chemistry (for molecular aspects) and Earth Science (for ocean salinity, biogeochemical cycles). Let's answer question 2 first: A hydrophobic substance repels water, non - polar, e.g., oil.

Answer:

1. A hydrophobic substance is a substance that repels or is insoluble in water (it is non - polar and does not form favorable interactions with water molecules). An example of a hydrophobic substance is oil (such as vegetable oil or motor oil).