Question 1

Which of the following statements best describes the difference between a physical and a chemical change? Consider the burning of wood and the melting of ice.

Accepted Answer

Burning wood is a chemical change because new substances are formed, while melting ice is a physical change because the chemical identity of water remains the same.

Question 2

A patient is prescribed a medication at a dosage of 250 mg. The available tablets are labeled as 0.25 g each. How many tablets should the patient take? (1 g = 1000 mg)

Accepted Answer

1 tablet

Question 3

Which of the following elements is a transition metal?

Accepted Answer

Iron (Fe)

Question 4

Given the following chemical equation, what is the correct set of coefficients to balance it?
$$
\mathrm{C_3H_8 + O_2$ \rightarrow CO_2$ + H_2O}
$$

Accepted Answer

$$1, 5, 3, 4$$

Question 5

A solution is prepared by dissolving 10.0 g of NaCl in enough water to make 250.0 mL of solution. What is the molarity of the solution? (Molar mass of NaCl = 58.44 g/mol)

Accepted Answer

$$0.684\ \mathrm{M}$$

Question 6

Which of the following best explains why gases are highly compressible, according to the kinetic molecular theory?

Accepted Answer

Gas particles are in constant motion and occupy a large volume compared to their size.

Question 7

Which of the following ions has the correct symbol and charge?

Accepted Answer

Sulfide ion: $$\mathrm{S$$^{2-}$$}$$

Question 8

A sample of gas occupies $$2.50\ \mathrm{L} at$$ $$1.00\ \mathrm{atm}$$ and $$25^\circ\mathrm{C}. If $$the pressure is increased to $$2.00\ \mathrm{atm} at $$constant temperature, what will be the new volume? (Boyle's Law: $$P_1V_1 = P_2V_2)$$

Accepted Answer

$$1.25\ \mathrm{L}$$

Question 9

Which of the following best describes the effect of a hypotonic solution on red blood cells?

Accepted Answer

Water enters the cells, causing them to swell and possibly burst.

Question 10

What is the pH of a solution with a hydrogen ion concentration of $$[H^+] = 1.0 	imes 10$$^{-4}$$\ \mathrm{M}$$?

Accepted Answer

$$4.0$$

Question 11

Which of the following is a property of bases?

Accepted Answer

They turn red litmus paper blue.

Question 12

Which of the following compounds is a carboxylic acid?

Accepted Answer

CH$$_3$$COOH

Question 13

Which of the following best describes the role of buffers in blood?

Accepted Answer

Buffers maintain a relatively constant pH by neutralizing added acids or bases.

Question 14

Which of the following is the correct formula for the compound formed between magnesium and chlorine?

Accepted Answer

$$\mathrm{$$MgCl_2$$}$$

Question 15

Which of the following best describes the geometry around a carbon atom with four single bonds?

Accepted Answer

Tetrahedral

Question 16

A solution is made by diluting $$50.0\ \mathrm{mL} of$$ $$6.0\ \mathrm{M}$$ HCl to a final volume of $$300.0\ \mathrm{mL}. $$What is the final concentration?

Accepted Answer

$$1.0\ \mathrm{M}$$

Question 17

Which of the following best explains why alcohols generally have higher boiling points than alkanes of similar molar mass?

Accepted Answer

Alcohols can form hydrogen bonds, which require more energy to break.

Question 18

Which of the following is a correct statement about the movement of oxygen and carbon dioxide in the body?

Accepted Answer

Oxygen moves from the alveoli into arterial blood due to higher partial pressure in the alveoli.

Question 19

Which of the following is a correct example of a saturated fatty acid?

Accepted Answer

CH$$_3(CH$_2$$)$$_{16}$$COOH

CHEM 1123: Comprehensive Study Guide and Learning Objectives

Guida di studio - Domande di pratica

Study guide - Flashcard