Chemistry Exam Review (June '14)

Compared to the charge of a proton, the charge of an electron has

• a greater magnitude and the same sign

• a greater magnitude and the opposite sign

• the same magnitude and the same sign

• the same magnitude and the opposite sign

Which atom has the largest atomic radius?

• potassium

• rubidium

• francium

• cesium

In the wave-mechanical model of the atom, an orbital is defined as

• a region of the most probable proton location

• a region of the most probable electron location

• a circular path traveled by a proton around the nucleus

• a circular path traveled by an electron around the nucleus

When an excited electron in an atom moves to the ground state, the electron

• absorbs energy as it moves to a higher energy state

• absorbs energy as it moves to a lower energy state

• emits energy as it moves to a higher energy state

• emits energy as it moves to a lower energy state

Which polyatomic ion is found in the compound represented by the formula NaHCO₃?

• acetate

• hydrogen carbonate

• hydrogen sulfate

• oxalate

The atomic mass of magnesium is the weighted average of the atomic masses of

• all of the artificially produced isotopes of Mg

• all of the naturally occurring isotopes of Mg

• the two most abundant artificially produced isotopes of Mg

• the two most abundant naturally occurring isotopes of Mg

Which element has atoms that can form halide ions?

• iodine

• silver

• strontium

• xenon

Two forms of solid carbon, diamond and graphite, differ in their physical properties due to the differences in their

• atomic numbers

• crystal structures

• isotopic abundances

• percent compositions

Which quantity can be calculated for a solid compound, given only the formula of the compound and the Periodic Table of the Elements?

• the density of the compound

• the heat of fusion of the compound

• the melting point of each element in the compound

• the percent composition by mass of each element in the compound

Which terms identify types of chemical reactions?

• decomposition and sublimation

• decomposition and synthesis

• deposition and sublimation

• deposition and synthesis