Ch.2 Self Quiz

The measure of an atom's ability to pull electrons away from another atom is called _____. a. Electronegativity b. Charge c. Polarity

A

The mutual attraction of opposite charges hold atoms together as molecules in a (n) ______ bond. a. Ionic b. Hydrogen c. Polar covalent d. Nonpolar covalent

A

What atom has only one proton? a. Hydrogen b. An isotope c. A free radical d. A radioisotope

A

When dissolved in water, a(n) _____ donated H+; a(n) ______ accepts H+ a. Acid; base b. Base; acid c. Buffer; solute d. Base; buffer

A

A ______ is dissolved in a solvent a. Molecule b. Solute c. Salt

B

A molecule into which a radioisotope has been incorporated can be used as a(n) _____. a. Compound b. Tracer c. Salt d. Acid

B

An ion is an atom that has _____. a. The same number of electrons and protons. b. A different number of electrons and protons. c. Electrons, protons, and neurons

B

A salt does not release ______ in water. a. Ions b. Energy c. H+

C

A(n) _____ can help keep the pH of a solution stable. a. Covalent bond b. Hydrogen bond c. Buffer d. pH

C

A(n) _____ substance repels water. a. Acidic b. Basic c. Hydrophobic d. Polar

C

Atoms share electrons unequally in a(n) _______ bond. a. Ionic b. Hydrogen c. Polar covalent d. Nonpolar covalent

C

Match the terms with their most suitable description. - Hydrophilic - Atomic number - Hydrogen bonds - Positive charge - Temperature - Negative charge a. Protons > electrons b. Number of protons in nucleus c. Polar; dissolves easily in water d. Collectively strong e. Protons < electrons f. Measure of molecular motion

C B D A F E

Hydrogen ions (H+) are _____. a. Indicated by a pH scale. b. Protons c. In blood d. All of the above

D

In the periodic table, symbols for the elements are arranged according to ________. a. Size b. Charge c. Mass number d. Atomic number

D

Which of the following statements is incorrect? a. Isotopes have the same atomic number and different mass numbers. b. Atoms have about the same number of electrons as protons. c. All ions are atoms. d. Free radicals are dangerous because they emit energy.

D