$$7.26 \times 10$$^{23}$$ molecules

Question 1

Which rule explains why electrons fill degenerate orbitals singly before pairing up, and with parallel spins?

Accepted Answer

Hund's rule

Question 2

What is the ground state electron configuration for arsenic (As)?

Accepted Answer

[Ar]$$4s^2$$ $$3d^{10}$$ $$4p^3$$

Question 3

How many valence electrons do alkaline earth metals have?

Accepted Answer

2

Question 4

Which pair of elements is most chemically similar?

Accepted Answer

chlorine and fluorine

Question 5

Which of the following statements is TRUE regarding the periodic table?

Accepted Answer

Nonmetals are located on the right side of the periodic table.

Question 6

Arrange the following elements in order of increasing atomic radius: Cs, Sb, S, Pb, Se.

Accepted Answer

S \u003c Se \u003c Sb \u003c Pb \u003c Cs

Question 7

Which of the following best describes an ionic bond?

Accepted Answer

the transfer of electrons from one atom to another, resulting in a strong attractive force

Question 8

What is the formula for cobalt(II) phosphate?

Accepted Answer

$$Co_3$$($$PO_4)_2$$

Question 9

Which of the following compounds contains both covalent and ionic bonds?

Accepted Answer

KCN

Question 10

Calculate the number of molecules in 76.3 g of $$N_2O_4. ($$Molar mass = 92.02 g/mol)

Accepted Answer

$$7.26 	imes 10$$^{23}$$ molecules

Question 11

Which bond is the longest?

Accepted Answer

C–C

Question 12

Rank the following bonds in order of increasing polarity: C–H, C–C, C–N, C–O.

Accepted Answer

C–C \u003c C–H \u003c C–N \u003c C–O

Question 13

How many valence electrons are present in methanol, $$CH_3OH$$?

Accepted Answer

14

Question 14

What is the molecular geometry of a molecule with a central atom that forms two single bonds and possesses two lone pairs of electrons?

Accepted Answer

bent

Question 15

Determine the electron domain geometry (eg) and molecular geometry (mg) of $$BF_3.$$

Accepted Answer

eg = trigonal planar, mg = trigonal planar

Question 16

Which of the following molecular geometries is always polar for a molecule $$AB_n ($$where $$n = 2, 3, 4, 5, 6$$)?

Accepted Answer

bent

Question 17

What is the definition of electronegativity?

Accepted Answer

the ability of an atom to attract electrons to itself in a chemical bond

Question 18

A compound has an empirical formula of $$NO_2$$ and a molar mass of 92.0 g/mol. What is its molecular formula?

Accepted Answer

$$N_2O_4$$

Question 19

Which of the following is the correct formula for the compound formed between magnesium and nitrate?

Accepted Answer

$$Mg(NO_3$)_2$$

Question 20

What is the molar mass of $$Ca_3$$($$PO_4)_2$?

Accepted Answer

310.18 g/mol

General Chemistry I Practice Exam 2 Study Guidance

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