$$40.08 + 12.01 + 3 \times 16.00 = 100.09 g/$$mol

Question 1

Which of the following best describes the trend in electronegativity across the periodic table?

Accepted Answer

Electronegativity increases from left to right and decreases down a group.

Question 2

Given the electronegativity values: H = 2.1 and Cl = 3.0, what type of bond is present in HCl?

Accepted Answer

Polar covalent

Question 3

Which of the following molecules is expected to have a non-polar covalent bond?

Accepted Answer

H2

Question 4

Which element is most likely to be the central atom in a Lewis structure?

Accepted Answer

Carbon

Question 5

Which of the following elements can accommodate more than eight electrons in their valence shell?

Accepted Answer

Elements in period 3 and beyond

Question 6

What is the formal charge on the oxygen atom in the best Lewis structure of the nitrate ion, $$NO_3$$^-$$?

Accepted Answer

$$-1$$

Question 7

Which of the following best describes the geometry around the central atom in $$BF_3$$?

Accepted Answer

Trigonal planar

Question 8

Which hybridization is associated with a molecule that has a tetrahedral electron geometry?

Accepted Answer

$$sp^3$$

Question 9

A triple bond between two carbon atoms consists of:

Accepted Answer

Two $$\pi$$ bonds and one $$\sigma$$ bond

Question 10

Which of the following statements about balancing chemical equations is correct?

Accepted Answer

Atoms must be balanced on both sides of the equation.

Question 11

What is the molar mass of $$CaCO_3$$?

Accepted Answer

$$40.08 + 12.01 + 3 	imes 16.00 = 100.09 g/$$mol

Question 12

How many moles are in $$3.01 	imes 10$$^{23}$$ molecules of CO_2$?

Accepted Answer

$$0.500$$ mol

Question 13

A reaction has a theoretical yield of 10.0 g and an actual yield of 7.5 g. What is the percent yield?

Accepted Answer

$$75\%$$

Question 14

Which of the following is an empirical formula?

Accepted Answer

$$CH_2$$

Question 15

Which of the following best describes a sigma ($$\sigma) $$bond?

Accepted Answer

A head-to-head overlap of atomic orbitals

Question 16

If 10.0 g of $$H_2O is $$decomposed, how many grams of $$O_2$$ are produced? (Assume the reaction: $$2 H_2O \rightarrow 2 H_2$ + O_2$)

Accepted Answer

$$4.44 g$$

Question 17

Which of the following best describes the difference between molecular and empirical formulas?

Accepted Answer

The molecular formula shows the actual number of atoms, while the empirical formula shows the simplest ratio.

Question 18

Which of the following is true about resonance structures?

Accepted Answer

They show different possible arrangements of electrons.

Question 19

Which of the following best describes the geometry of $$PCl_5$$?

Accepted Answer

Trigonal bipyramidal

Question 20

Which of the following statements about the Law of Conservation of Mass is correct?

Accepted Answer

The total mass of reactants equals the total mass of products in a chemical reaction.

Chemical Bonding, Molecular Structure, and Stoichiometry: Study Notes

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