Chapter 2

Electrons carry a __ charge. a. positive b. negative c. zero

A(n) ___ is any molecule to which a radioisotope has been attached for research or diagnostic purposes. a. ion b. isotope c. element d. tracer

Atoms share electrons unequally in a(n)___ bond. a. ionic b. hydrogen c. polar covalent d. nonpolar covalent

In a hydrogen bond, a hydrogen atom covalently bonded to one molecule weakly interacts with a ___ part of a neighboring molecule. a. polar b. nonpolar c. hydrophobic

Liquid water shows ___. a. polarity b. hydrogen-bonding capacity c. notable heat resistance d. cohesion e. b through d f. all of the above

Hydrogen ions \(\left(\mathrm{H}^{+}\right)\) are ___. a. the basis of pH values b. unbound protons c. targets of certain buffers d. dissolved in blood e. both a and b f. a through d

When dissolved in water, a(n) ___ donates \(\mathrm{H}^{+}\) however, a(n) ___ accepts \(\mathrm{H}^{+}\).

A(n) ___ is a dynamic chemical partnership between a weak acid and a weak base. a. ionic bond b. solute c. buffer system d. solvent

Match the terms with their most suitable description. $$ \text { trace element } \quad \quad\quad\quad\quad \text { a. atomic nucleus components } $$ $$ \text { salt } \quad \quad\quad\quad\quad \text { b. two atoms sharing electrons } $$ $$ \text { covalent bond } \quad \quad\quad\quad\quad \text { c. any polar molecule that readily dissolves in water } $$ $$ \text { hydrophilic substance } \quad \quad\quad\quad\quad \text { d. releases ions other than \(\mathrm{H}^{+}\) and \(\mathrm{OH}^{-}\) when dissolved in water } $$ $$ \text { protons, neutrons } \quad \quad\quad\quad\quad \text { e. makes up less than 0.001 percent of body weight } $$