Question

1. part a a charged particle is generally called an ion or electrolyte. true false 35. part a about 60 to 80% of the volume of most living cells consists of organic compounds. true false 36. part a the lower the ph, the higher the hydrogen - ion concentration. true false 37. part a the acidity of a solution reflects the concentration of free hydrogen ions in the solution. true false 38. part a phospholipids make up most of the lipid part of the cell membrane. since water exists on both the outside and inside of a cell, which of the following phospholipid arrangements makes the most sense? two back - to - back phospholipid layers with the polar heads facing out on both sides two back - to - back phospholipid layers with the non - polar tails facing out on both sides a single layer of phospholipids with the polar heads facing inside the cell a single layer of phospholipids with the polar heads facing outside the cell 39. part a triglycerides are a poor source of stored energy. true false

Explanation:

1. A charged particle is indeed called an ion. Electrolytes are substances that produce ions when dissolved in water. So the statement is True.
2. About 60 - 80% of the volume of most living cells consists of water, not organic compounds. So the statement is False.
3. The pH is defined as -log[H⁺]. So, the lower the pH, the higher the hydrogen - ion concentration. The statement is True.
4. Acidity is related to the concentration of free hydrogen ions in a solution. The statement is True.
5. Phospholipids have a polar head and non - polar tails. Since water is polar and exists both inside and outside the cell, the most stable arrangement is two back - to - back phospholipid layers with the polar heads facing out on both sides to interact with water.
6. Triglycerides are a rich source of stored energy. So the statement is False.

Answer:

1. True
2. False
3. True
4. True
5. two back - to - back phospholipid layers with the polar heads facing out on both sides
6. False