Question

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 consid

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. An atom that has lost two electrons is a cation.
2. Proteins are organic compounds that are essential for building tissues and act as enzymes to catalyze chemical reactions.
3. Hydrogen bonding between water molecules gives rise to surface tension, which allows water to form droplets and support small objects on its surface.
4. A solution with a pH of 7 is considered neutral as it has an equal concentration of hydrogen ($H^+$) and hydroxyl ($OH^-$) ions.
5. In the reaction $HCl + NaOH

ightarrow H_2O+NaCl$, $NaOH$ is a base as it donates a hydroxide ion ($OH^-$) in the reaction.

1. An atom with 11 protons, 12 neutrons, and 10 electrons has a net positive charge (+1) because there is one more proton than electron, making it a cation.

Answer:

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