$$0.500 \times 2 \times 6.022 \times 10$$^{23}$$

Question 1

Refer to the first image. What is the molecular geometry of the molecule shown, and what is the bond angle between the hydrogen atoms?

Accepted Answer

Tetrahedral, 109.5°

Question 2

The second image shows a skeletal structure. What is the molecular formula for this compound?

Accepted Answer

$$\mathrm{C_4H_8}$$

Question 3

The third image is a five-sided ring. How many hydrogen atoms are present in this molecule?

Accepted Answer

10

Question 4

The fourth image shows a three-carbon chain ending in an OH group. What is the molecular formula for this compound?

Accepted Answer

$$\mathrm{C_3H_8O}$$

Question 5

The fifth image is a simple zig-zag line. What is the molecular formula for this compound?

Accepted Answer

$$\mathrm{C_2H_6}$$

Question 6

The sixth image shows a two-carbon chain with a double bond. What is the molecular formula for this compound?

Accepted Answer

$$\mathrm{C_2H_4}$$

Question 7

Based on the seventh image, what is the correct sequence of steps to convert the number of molecules of a substance to its mass in grams?

Accepted Answer

Divide by Avogadro's number, then multiply by molar mass

Question 8

Which of the following molecules is nonpolar, despite having polar bonds?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 9

Which skeletal structure represents propane?

Accepted Answer

The structure with three carbons in a straight chain and no double bonds

Question 10

If you have 0.500 mol of $$\mathrm{CO_2$}$$, how many oxygen atoms are present?

Accepted Answer

$$0.500 	imes 2 	imes 6.022 	imes 10$$^{23}$$

Question 11

Which of the following best describes the bond type and electron behavior in NaCl?

Accepted Answer

Ionic bond; electrons are transferred

Question 12

Which of the following ions is isoelectronic with neon ($$\mathrm{Ne}$$)?

Accepted Answer

$$\mathrm{Na^+}$$

Question 13

What is the correct name for the compound $$\mathrm{$$FeCl_3$$}$$?

Accepted Answer

Iron(III) chloride

Question 14

Which of the following molecules has a trigonal pyramidal geometry?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 15

What is the molarity of a solution prepared by dissolving 5.31 g of $$\mathrm{K_3PO_4} ($$molar mass = 212.27 g/mol) in 250.0 mL of solution?

Accepted Answer

$$0.100\ \mathrm{M}$$

Question 16

Which of the following compounds contains a polyatomic ion?

Accepted Answer

$$\mathrm{Ca_3$(PO_4$)_2}$$

Question 17

Which of the following is the correct formula for aluminum oxide?

Accepted Answer

$$\mathrm{Al_2O_3}$$

Question 18

A solution is prepared by diluting 10.0 mL of a 0.600 M stock solution to a final volume of 50.0 mL. What is the new concentration?

Accepted Answer

$$0.120\ \mathrm{M}$$

Question 19

Which of the following best describes the polarity of $$\mathrm{$$CHCl_3$$} ($$chloroform)?

Accepted Answer

Polar, because the outer atoms are not identical

Question 20

Which of the following is the correct name for $$\mathrm{N_2O_5}$$?

Accepted Answer

Dinitrogen pentoxide

GOB Chemistry Study Guide: Ionic Compounds, Covalent Compounds, Moles, and Molarity

Study Guide - Practice Questions