Question 1

Which of the following best describes a chemical change as opposed to a physical change, as discussed in Chapter 1?

Accepted Answer

Burning of gasoline in a car engine

Question 2

A nurse needs to administer 0.250 L of saline solution to a patient. If the solution is supplied in milliliters, how many milliliters should the nurse use? (Use the conversion $$1\ \mathrm{L} = 1000\ \mathrm{mL})$$

Accepted Answer

$$250\ \mathrm{mL}$$

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

A sample of gas occupies $$4.00\ \mathrm{L} at$$ $$1.00\ \mathrm{atm}$$ pressure. If the pressure is increased to $$2.00\ \mathrm{atm} at $$constant temperature, what will be the new volume? (Use Boyle's Law: $$P_1V_1 = P_2V_2)$$

Accepted Answer

$$2.00\ \mathrm{L}$$

Question 5

Which of the following best explains why salt (NaCl) dissolves in water but not in gasoline?

Accepted Answer

Water is a polar solvent and can stabilize the ions formed from NaCl.

Question 6

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

Accepted Answer

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

Question 7

A solution is prepared by dissolving $$5.00\ \mathrm{g} of $$glucose ($$C_6H_{12}O_6$) in enough water to make 100.0$$\ \mathrm{mL}$$ of solution. What is the mass/volume percent ($$\%$$ m/v) of glucose in the solution?

Accepted Answer

$$5.00\%$$

Question 8

Which of the following best describes the role of a buffer in blood?

Accepted Answer

It maintains the pH of blood by neutralizing small amounts of acids or bases.

Question 9

Which of the following is a correct Lewis structure for methane ($$CH_4$$)?

Accepted Answer

A central carbon atom with four single bonds to four hydrogen atoms.

Question 10

Which of the following statements about acids and bases is correct according to the Brønsted-Lowry theory?

Accepted Answer

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

Question 11

Which of the following compounds is an example of an ester?

Accepted Answer

$$CH_3COOCH_3$$

Question 12

A patient’s blood pH drops from 7.40 to 7.10. Which of the following best describes this change?

Accepted Answer

The blood has become more acidic.

Question 13

Which of the following best describes the structure of a protein?

Accepted Answer

A polymer of amino acids linked by peptide bonds.

Question 14

Which of the following is a correct statement about the difference between alkanes and alkenes?

Accepted Answer

Alkanes contain only single bonds, while alkenes contain at least one double bond.

Question 15

A sample contains $$2.0\ \mathrm{mol} of$$ $$O_2$$ gas at $$25^\circ\mathrm{C}$$ and $$1.0\ \mathrm{atm}. $$What is the volume of the gas? (Use the ideal gas law: $$PV = nRT$$, $$R = 0.0821\ \mathrm{L\cdot atm\cdot $$mol^{-1}$$\cdot K$$^{-1}$$}$$, $$T = 298\ \mathrm{K})$$

Accepted Answer

$$49\ \mathrm{L}$$

Question 16

Which of the following best describes the function of enzymes in biological systems?

Accepted Answer

They act as catalysts to speed up chemical reactions.

Question 17

Which of the following is the correct formula for calculating the density of a substance?

Accepted Answer

$$	ext{Density} = \dfrac{	ext{Mass}}{	ext{Volume}}$$

Question 18

Which of the following is a correct statement about the solubility of gases in liquids?

Accepted Answer

The solubility of gases in liquids decreases as temperature increases.

Question 19

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

Accepted Answer

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

Chemistry 110 Course Schedule and Topic Overview

Guida di studio - Domande di pratica

Study guide - Flashcard