Chapter 2

In the periodic table, symbols for the elements are arranged according to ___________. a. size c. mass number b. charge d. atomic number

$A(n) _______ is a molecule into which a radioisotope has been incorporated. a. compound c. salt b. tracer d. acid

An ion is an atom that has _________ . a. the same number of electrons and protons b. different numbers of electrons and protons

The measure of an atom's ability to pull electrons away from another atom is called ____________. a. electronegativity c. charge b. polarity d. concentration

6\. The mutual attraction of opposite charges holds atoms together as molecules in a(n) ____________ a. ionic b. hydrogen d. nonpolar covalent

7\. Atoms share electrons unequally in a(n) ________ bond.

\(A(n)\) __________ substance repels water. a. acidic c. hydrophobic b. basic d. polar

Hydrogen ions \(\left(\mathrm{H}^{+}\right)\) are ___________. a. indicated by a pH scale c. in blood b. unbound protons d. all of the above

When dissolved in water, a(n) ______ donates \(\mathrm{H}^{+}\) \(a(n) ________ accepts \)H^{+}$.

A(n) ____________ is a chemical partnership between a weak acid or base and its salt. a. covalent bond c. buffer b. hydrogen bond d. \(\mathrm{pH}\)

\(A(n)\) ________ is dissolved in a solvent. a. molecule c. salt b. solute d. acid

Match the terms with their most suitable description. _______hydrophilic _______atomic number _______charged atom _______mass number _______temperature _______uncharged _______negative charge _______positive charge a. protons \(>\) electrons b. number of protons in nucleus c. polar; easily dissolves in water d. ion e. protons \(<\) electrons f. protons = electrons g. measure of molecular motion h. number of protons and neutrons in atomic nucleus