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

$$M = \frac{\text{moles of solute}}{\text{volume of solution in liters}}$$

Q: A hospital uses oxygen gas stored at 300 K and 2.0 atm in a 10.0 L tank. How many moles of oxygen are present? ($$R = 0.0821 L$$·atm·mol$$^{-1}$$·K$$^{-1})$$

$$n = \frac{2.0 \times 10.0}{0.0821 \times 300}$$

Question 1

Which of the following best describes a chemical property of matter?

Accepted Answer

Copper reacts with oxygen to form copper oxide.

Question 2

A student needs to convert 25.0 grams of NaCl to moles. Given the molar mass of NaCl is 58.44 g/mol, which calculation is correct?

Accepted Answer

$$\frac{25.0}{58.44}$$

Question 3

Which formula correctly expresses the root-mean-square speed ($$v_{rms}) of a $$gas molecule according to kinetic molecular theory?

Accepted Answer

$$v_{rms} = \sqrt{\frac{3k_B T}{m}}$$

Question 4

Which periodic trend increases as you move from left to right across a period in the periodic table?

Accepted Answer

Ionization energy

Question 5

Which of the following compounds is ionic?

Accepted Answer

NaCl

Question 6

What is the correct Lewis structure for the nitrate ion, NO$$_3^-$$?

Accepted Answer

Nitrogen with one double bond and two single bonds to oxygen atoms, with resonance among the oxygens and the negative charge delocalized.

Question 7

Which of the following is a redox reaction?

Accepted Answer

2Na + Cl$$_2$$ → 2NaCl

Question 8

A sample of gas at 1.00 atm and 273 K occupies 22.4 L. If the temperature is doubled and the pressure is halved, what is the new volume?

Accepted Answer

$$89.6 L$$

Question 9

Which statement about effective nuclear charge ($$Z_{eff}) is $$correct?

Accepted Answer

$$Z_{eff}$$ increases across a period.

Question 10

Which of the following is the correct name for the compound Fe$$_2(SO$_4$$)$$_3$$?

Accepted Answer

Iron(III) sulfate

Question 11

Which of the following best explains why water is a polar molecule?

Accepted Answer

Oxygen is more electronegative than hydrogen and the molecule has a bent shape.

Question 12

Which gas law describes the relationship between pressure and volume at constant temperature?

Accepted Answer

Boyle's Law: $$P_1$$ $$V_1$$ = $$P_2$$ $$V_2$$

Question 13

Which of the following is a covalent compound?

Accepted Answer

CO$$_2$$

Question 14

A reaction occurs in aqueous solution and produces a precipitate. What type of reaction is this?

Accepted Answer

Precipitation reaction

Question 15

Which of the following statements about the kinetic molecular theory of gases is FALSE?

Accepted Answer

Gas particles experience strong intermolecular forces.

Question 16

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

Accepted Answer

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

Question 17

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

Accepted Answer

$$M = \frac{	ext{moles of solute}}{	ext{volume of solution in liters}}$$

Question 18

Which of the following is a correct application of dimensional analysis to convert 100 cm to meters?

Accepted Answer

$$100 	imes \frac{1}{100}$$

Question 19

Which of the following best explains why noble gases are chemically inert?

Accepted Answer

They have a full valence shell of electrons.

Question 20

A hospital uses oxygen gas stored at 300 K and 2.0 atm in a 10.0 L tank. How many moles of oxygen are present? ($$R = 0.0821 L$$·atm·mol$$^{-1}$$·K$$^{-1})$$

Accepted Answer

$$n = \frac{2.0 	imes 10.0}{0.0821 	imes 300}$$

CHEM 1111 General Chemistry II: Core Concepts and Study Guide

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