Question

1. which of the following is classified as an inorganic compound: a. water b. steroid c. triglyceride d. glucose e. protein 24. the major function of potassium is to: a. play a role in nerve impulse transmissions and muscle contractions b. exist as the most abundant extracellular cation c. make functional thyroid hormones d. influence the ph of body fluids e. serve as a salt in bones and teeth 25. the atomic number of an atom reveals the number of: a. electrons in the atomic nucleus b. protons in the atomic nucleus c. neutrons plus electrons d. protons plus neutrons e. protons plus electrons 26. which of the following contains sodium: a. nacl b. h₂o c. h₂so₄ d. n₂ e. ch₄ 27. an atom has 6 protons, 8 neutrons, and 6 electrons. its atomic mass is: a. 6 b. 2 c. 8 d. 14 e. 20 28. a lipid containing three fatty acid chains and one glycerol is called: a. a steroid b. glycogen c. a triglyceride d. a polysaccharide e. cholesterol

Explanation:

1. Organic compounds contain carbon - hydrogen bonds. Water ($H_2O$) has no carbon - hydrogen bonds and is inorganic. Steroids, triglycerides, glucose, and proteins are organic.
2. Potassium is crucial for nerve impulse transmission and muscle contractions. Sodium is the most abundant extracellular cation, iodine is for thyroid hormones, bicarbonate influences pH, and calcium is in bones and teeth.
3. The atomic number is equal to the number of protons in the atomic nucleus.
4. Sodium chloride ($NaCl$) contains sodium. $H_2O$ is water, $H_2SO_4$ is sulfuric acid, $N_2$ is nitrogen gas, and $CH_4$ is methane.
5. Atomic mass is the sum of protons and neutrons. So, 6 (protons) + 8 (neutrons) = 14.
6. A lipid with three fatty - acid chains and one glycerol is a triglyceride.

Answer:

1. a. water
2. a. play a role in nerve impulse transmissions and muscle contractions
3. b. protons in the atomic nucleus
4. a. $NaCl$
5. d. 14
6. c. a triglyceride