Q: Which of the following is a correct balanced equation for the combustion of methane ($$\\ce{CH4}) in $$oxygen?

$$\\ce{CH4 + 2O2 -\u003e CO2 + 2H2O}$$

Q: Which of the following is an example of a redox reaction?

$$\\ce{2Na + Cl2 -\u003e 2NaCl}$$

Question 1

Which of the following best describes a chemical change as opposed to a physical change?

Accepted Answer

Iron rusting when exposed to oxygen.

Question 2

A sample contains 3.0 moles of $$\ce{NaCl}. $$How many formula units of $$\ce{NaCl}$$ are present in the sample? (Avogadro's number $$= 6.022 \times 10$$^{23}$$)

Accepted Answer

$$1.81 \times 10$$^{24}$$

Question 3

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

Question 4

Which of the following compounds is named correctly according to IUPAC nomenclature?

Accepted Answer

NaCl: Sodium chloride

Question 5

A reaction is carried out in which 10.0 g of $$\ce{H2}$$ reacts with excess $$\ce{O2} to $$form water. What is the theoretical yield of water in grams? (Molar mass of $$\ce{H2} = 2.0 g/$$mol, $$\ce{H2O} = 18.0 g/$$mol)

Accepted Answer

Question 6

Which of the following best explains why noble gases are generally unreactive?

Accepted Answer

They have completely filled valence electron shells.

Question 7

Which of the following is a correct balanced equation for the combustion of methane ($$\ce{CH4}) in $$oxygen?

Accepted Answer

$$\ce{CH4 + 2O2 -\u003e CO2 + 2H2O}$$

Question 8

Which of the following statements about ionic and covalent bonds is correct?

Accepted Answer

Ionic bonds involve the transfer of electrons, while covalent bonds involve the sharing of electrons.

Question 9

A gas occupies a volume of 2.0 L at a pressure of 1.0 atm. If the pressure is increased to 4.0 atm at constant temperature, what will be the new volume of the gas?

Accepted Answer

0.5 L

Question 10

Which of the following best describes the role of energy in an endothermic chemical reaction?

Accepted Answer

Energy is absorbed from the surroundings.

Question 11

Which of the following is a strong electrolyte when dissolved in water?

Accepted Answer

$$\ce{NaCl}$$

Question 12

Which of the following elements has the highest electronegativity?

Accepted Answer

Fluorine

Question 13

Which of the following is the correct electron configuration for a neutral atom of sodium ($$Z=11$$)?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^1$$

Question 14

Which of the following molecules has a trigonal planar geometry?

Accepted Answer

$$\ce{BF3}$$

Question 15

Which of the following statements about intermolecular forces is correct?

Accepted Answer

Hydrogen bonding is stronger than London dispersion forces.

Question 16

A solution is prepared by dissolving 5.0 g of $$\ce{NaCl} in $$enough water to make 250 mL of solution. What is the molarity of the solution? (Molar mass of $$\ce{NaCl} = 58.44 g/$$mol)

Accepted Answer

0.342 M

Question 17

Which of the following best describes the periodic trend for atomic radius across a period from left to right?

Accepted Answer

Atomic radius decreases.

Question 18

Which of the following is an example of a redox reaction?

Accepted Answer

$$\ce{2Na + Cl2 -\u003e 2NaCl}$$

Question 19

A sample of gas at 25°C and 1.00 atm occupies 10.0 L. If the temperature is increased to 50°C at constant pressure, what will be the new volume? (Assume ideal gas behavior.)

Accepted Answer

10.8 L

Question 20

Which of the following best describes the difference between a strong acid and a weak acid in aqueous solution?

Accepted Answer

A strong acid completely ionizes in water, while a weak acid only partially ionizes.

General Chemistry I (CHEM-1311) Syllabus and Study Guide

Guida di studio - Domande di pratica

Study guide - Flashcard