Question

multiple choice
identify the choice that best completes the statement or answers the question.

1. an atom that has lost two electrons is called a(n):

a. cation
b. isotope
c. anion
d. proton
e. radioisotope

1. the organic compounds that function in building tissues and acting as enzymes are the:

a. salts
b. nucleic acids
c. proteins
d. lipids
e. carbohydrates

1. hydrogen bonding between water molecules is responsible for:

a. denaturation of proteins
b. nonpolar covalent bonding
c. surface tension
d. enzyme structure
e. polarity

1. a solution with a ph of 7:

a. is acidic
b. releases more hydrogen ions than hydroxyl ions into solution
c. is basic
d. releases more hydroxyl ions than hydrogen ions into solution
e. is neutral

1. in the chemical reaction, hcl + naoh → h₂o + nacl, the chemical naoh is considered to be:

a. product
b. acid
c. salt
d. base
e. water

1. an atom with 11 protons, 12 neutrons, and 10 electrons is a(n):

a. isotope
b. cation
c. radioisotope
d. molecule
e. anion

Explanation:

1. Cations are positively - charged ions formed when an atom loses electrons. Losing two electrons makes it a cation.
2. Proteins are organic compounds that play crucial roles in building tissues and acting as enzymes.
3. Hydrogen bonding between water molecules gives rise to surface tension.
4. A solution with a pH of 7 has an equal concentration of hydrogen and hydroxyl ions, making it neutral.
5. In the reaction HCl + NaOH → H₂O+NaCl, NaOH is a base as it donates hydroxide ions in solution.
6. An atom with 11 protons and 10 electrons has a net positive charge, so it is a cation.

Answer:

1. a. cation
2. c. proteins
3. c. surface tension
4. e. is neutral
5. d. base
6. b. cation