Q: Which of the following is the correct balanced equation for the combustion of methane ($$\text{CH}_4) in $$oxygen?

$$\text{CH}_4 + 2\text{O}_2 \rightarrow \text{CO}_2 + 2\text{H}_2\text{O}$$

Q: Which of the following is the correct formula for calculating the enthalpy change ($$\Delta H) of a $$reaction using bond energies?

$$\Delta H = \sum \text{Bond energies of bonds broken} - \sum \text{Bond energies of bonds formed}$$

Q: Which of the following hydrocarbons is an alkene?

Ethene ($$\text{C}_2\text{H}_4)$$

Question 1

Which of the following statements best describes the difference between covalent and metallic bonds?

Accepted Answer

Covalent bonds involve the sharing of electrons between atoms, while metallic bonds involve the delocalization of electrons across a lattice of metal atoms.

Question 2

A sample contains 0.50 mol of $$	ext{NaCl}. $$What is the mass of the sample? (Molar mass of $$	ext{NaCl} is$$ $$58.44 	ext{ g/mol})$$

Accepted Answer

$$29.22 	ext{ g}$$

Question 3

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

Accepted Answer

Their valence electron shells are completely filled, making them stable.

Question 4

Which equation correctly represents the relationship between energy, frequency, and Planck's constant?

Accepted Answer

$$E = h 
u$$

Question 5

A chemical reaction has a rate constant $$k$$ that doubles when the temperature increases from $$300 	ext{ K} to$$ $$310 	ext{ K}. $$Which equation best describes the relationship between $$k$$ and temperature?

Accepted Answer

$$k = A e$$^{-E_a/(RT)}$$

Question 6

Which of the following is the correct balanced equation for the combustion of methane ($$	ext{CH}_4) in $$oxygen?

Accepted Answer

$$	ext{CH}_4 + 2	ext{O}_2 ightarrow 	ext{CO}_2 + 2	ext{H}_2	ext{O}$$

Question 7

Which statement about Le Chatelier's Principle is correct?

Accepted Answer

If a system at equilibrium is disturbed, the system will shift to counteract the disturbance and restore equilibrium.

Question 8

Which of the following is a correct statement about acids and bases according to the Brønsted-Lowry definition?

Accepted Answer

An acid is a proton donor and a base is a proton acceptor.

Question 9

A solution is prepared by dissolving $$0.10 	ext{ mol} of$$ $$	ext{HCl} in$$ $$1.0 	ext{ L} of $$water. What is the pH of the solution?

Accepted Answer

$$1.0$$

Question 10

Which of the following best describes the process of electrolysis in a voltaic cell?

Accepted Answer

Electrolysis is a non-spontaneous process that requires an external voltage to drive a chemical reaction.

Question 11

Which of the following is the correct formula for calculating the enthalpy change ($$\Delta H) of a $$reaction using bond energies?

Accepted Answer

$$\Delta H = \sum 	ext{Bond energies of bonds broken} - \sum 	ext{Bond energies of bonds formed}$$

Question 12

Which of the following elements has the highest electronegativity?

Accepted Answer

Fluorine

Question 13

A student mixes $$50.0 	ext{ mL} of$$ $$1.0 	ext{ M}$$ $$	ext{HCl}$$ with $$50.0 	ext{ mL} of$$ $$1.0 	ext{ M}$$ $$	ext{NaOH}. $$What is the final pH of the solution?

Accepted Answer

$$7.0$$

Question 14

Which of the following is the correct electron configuration for a neutral oxygen atom?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^4$$

Question 15

Which of the following is a correct statement about the periodic trend in atomic radius?

Accepted Answer

Atomic radius decreases across a period from left to right.

Question 16

Which of the following hydrocarbons is an alkene?

Accepted Answer

Ethene ($$	ext{C}_2	ext{H}_4)$$

Question 17

A reaction has the following equilibrium constant: $$K_c = 1.0 	imes 10$$^{-5}$$. Which statement is true about the reaction at equilibrium?

Accepted Answer

The concentration of reactants is much greater than the concentration of products.

Question 18

Which of the following is the correct formula for calculating the molarity ($$M) of a $$solution?

Accepted Answer

$$M = \dfrac{	ext{moles of solute}}{	ext{liters of solution}}$$

Question 19

Which of the following best describes the function of a catalyst in a chemical reaction?

Accepted Answer

A catalyst lowers the activation energy, increasing the rate of reaction without being consumed.

Question 20

A patient is given a saline solution containing $$0.90	ext{ g NaCl}$$ per $$100	ext{ mL} of $$solution. What is the molarity of NaCl in the solution? (Molar mass of NaCl = $$58.44	ext{ g/mol})$$

Accepted Answer

$$0.154	ext{ M}$$

General Chemistry Course Outline and Study Guide

Guida di studio - Domande di pratica

Study guide - Flashcard