Question

1. which of the following solutions is the weakest acid: a. a solution with a ph of 2.4 b. a solution with a ph of 5.2 c. a solution with a ph of 6.4 d. a solution with a ph of 8.6 e. a solution with a ph of 10.1 18. a solution with a ph of 7: a. is acidic b. releases more hydrogen ions than hydroxyl ions into solution c. releases more hydroxyl ions than hydrogen ions into solution d. is basic e. is neutral 19. which of the following is an example of an inorganic molecule: a. a fatty acid b. an amino acid c. cholesterol d. hydrochloric acid e. rna 20. glucose and starch are examples of: a. carbohydrates b. triglycerides c. phospholipids d. steroids e. proteins 21. the organic compounds that function in building tissues and acting as enzymes are the: a. nucleic acids b. carbohydrates c. salts d. lipids e. proteins 22. a lipid containing three fatty acid chains and one glycerol is called: a. cholesterol b. a steroid c. a triglyceride d. a polysaccharide e. glycogen

Explanation:

1. The pH scale ranges from 0 - 14. Acids have pH values less than 7, and the higher the pH value within the acidic range (below 7), the weaker the acid. Among the acidic options (a - c), option c has the highest pH value within the acidic range.
2. A pH of 7 is considered neutral on the pH scale, meaning the concentration of hydrogen ions ($H^+$) is equal to the concentration of hydroxyl ions ($OH^-$).
3. Inorganic molecules typically do not contain carbon - hydrogen bonds. Hydrochloric acid (HCl) is an inorganic compound, while fatty acids, amino acids, cholesterol, and RNA are organic.
4. Glucose is a monosaccharide and starch is a polysaccharide. Both are types of carbohydrates.
5. Proteins are organic compounds that play a crucial role in building tissues and act as enzymes.
6. A lipid consisting of three fatty acid chains and one glycerol molecule is called a triglyceride.

Answer:

1. c. a solution with a pH of 6.4
2. e. is neutral
3. d. hydrochloric acid
4. a. carbohydrates
5. e. proteins
6. c. a triglyceride