Chapter 1

The atomic number of boron is 5. The correct electronic configuration of boron is: A) 1s22s3 B) 1s22p3 C) 1s22s22p1 D) 2s22p3 E) 1s22s23s1

How many distinct p orbitals exist in the second electron shell, where n = 2? A) 2 B) 3 C) 4 D) 5 E) 6

The \_\_\_\_\_\_\_\_ tells us that each orbital can hold a maximum of 2 electrons. A) aufbau principle B) Pauli exclusion principle C) Hund's rule principle D) LeChatelier principle E) uncertainty principle

A node is a region of high electron density between the two atoms in a covalent bond. true or false?

When filling two or more orbitals of the same energy with electrons, the electrons will go into different orbitals rather than pair up in the same orbital. true or false?

Atoms with the same number of protons but different numbers of neutrons are called ________.

The electron density of ________ orbitals has spherical symmetry.

An oxygen atom has ________ valence electrons.

Orbitals which are equal in energy are referred to as \_\_\_\_\_\_\_\_. A) degenerate B) polar C) nodes D) filled E) nonpolar

In a carbon atom, the 2s and 2p orbitals are equal in energy. true or false?

A carbon-hydrogen bond in ethane (CH3CH3) is best described a \_\_\_\_\_\_\_\_. A) highly polar B) essentially nonpolar C) ionic D) a multiple bond E) resonance stabilized

The electronegativity of elements on the periodic table increases going \_\_\_\_\_\_\_\_ a column and to the \_\_\_\_\_\_\_\_ in each row. A) up, right B) up, left C) down, right D) down, left

Which of the following molecules contains a polar covalent bond? A) H2 B) F2 C) CH3Cl D) NaCl E) He

The compound methylamine, CH3NH2, contains a C-N bond. In this bond, which of the following best describes the charge on the carbon atom? A) +1 B) slightly positive C) uncharged D) slightly negative E) -1

The formal charge on oxygen in dimethyl ether, CH3OCH3, is \_\_\_\_\_\_\_\_. A) +2 B) +1 C) 0 D) -1 E) -2

For most compounds in which a nitrogen atom bears no formal charge, the valence of this nitrogen atom is ________.

In the compound sodium methoxide (NaOCH3), there is \_\_\_\_\_\_\_\_ bonding. A) ionic B) polar covalent C) nonpolar covalent D) a mixture of ionic and covalent E) resonance stabilized

Which of the following compounds are covalent compounds? A) KCl B) CF4 C) NH3 D) both A and B E) both B and C

When a negatively charged species is most appropriately depicted as a hybrid of several resonance forms, the negative charge present is considered to be rapidly moving between the resonance forms bearing the formal negative charge. true or false?

When a molecule can best be represented as a series of resonance forms, each of these forms always contributes to the same degree in the hybrid. true or false?

A sample of compound X is subjected to elemental analysis and the following percentages by weight are found: 39.97% C, 6.73% H, and 53.30% O. The molecular weight of X is 90. What is the empirical formula of X? A) C6HO8 B) C2H4O2 C) C4H10O2 D) C3H6O3 E) CH2O

Calculate the molecular formula for the organic compound whose quantitative elemental analysis showed 48.6% caron and 8.1% hydrogen by weight. A) CH2O B) C2H4O2 C) C2H6 D) C3H6O E) C3H6O2

The pH of a 150 mL aqueous solution of 2.13 x 10-3 M HCl is \_\_\_\_\_\_\_\_. A) -3.000 B) 3.000 C) 2.672 D) 2.130 E) none of the above

What is the pKa and general acid strength of formic acid if its conjugate base form has a pKb of 10.23? A) 3.77 - fairly strong weak acid B) 5.99 - moderately strong weak acid C) 14.00 - not an acid but rather a strong base D) 3.23 - fairly strong weak acid E) cannot be determined from the information given