Q: A sample of gas occupies 4.0 L at 1.0 atm and 300 K. What will be its volume at 2.0 atm and 300 K?

$$V_2$$ = \frac{P_1V_1}{$$P_2$$} = \frac{1.0 \times 4.0}{2.0} = 2.0\ \text{L}$$

Q: A compound contains 40.0 g of oxygen and 10.0 g of hydrogen. What is the percent by mass of hydrogen in the compound?

$$\frac{10.0}{40.0 + 10.0} \times 100 = 20\%$$

Q: A reaction has a theoretical yield of 50.0 g and an actual yield of 42.0 g. What is the percent yield?

$$\frac{42.0}{50.0} \times 100\% = 84\%$$

Q: If 2.0 mol of an ideal gas occupies 44.8 L at STP, what is the molar volume of the gas at STP?

$$\frac{44.8\ \text{L}}{2.0\ \text{mol}} = 22.4\ \text{L/mol}$$

Q: Which of the following is the correct conversion between units of pressure?

$$1\ \text{atm} = 760\ \text{mm Hg}$$

Q: A sample of gas at 300 K and 1.0 atm has a volume of 10.0 L. If the temperature is increased to 600 K at constant pressure, what is the new volume?

$$V_2$$ = $$V_1$$ \frac{$$T_2$$}{$$T_1$$} = 10.0 \times \frac{600}{300} = 20.0\ \text{L}$$

Question 1

Which of the following compounds is expected to be insoluble in water according to the solubility rules provided?

Accepted Answer

BaSO$$_4$$

Question 2

A sample of gas occupies 4.0 L at 1.0 atm and 300 K. What will be its volume at 2.0 atm and 300 K?

Accepted Answer

$$V_2$$ = \frac{P_1V_1}{$$P_2$$} = \frac{1.0 	imes 4.0}{2.0} = 2.0\ 	ext{L}$$

Question 3

Which of the following ions is a polyatomic ion with a -2 charge?

Accepted Answer

Sulfate ion, SO$$_4^{2-}$$

Question 4

What is the correct electron configuration for a neutral atom of calcium (Ca)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^6$$\ $$4s^2$$

Question 5

Which of the following best describes the trend in electronegativity across a period from left to right in the periodic table?

Accepted Answer

Electronegativity increases

Question 6

A compound contains 40.0 g of oxygen and 10.0 g of hydrogen. What is the percent by mass of hydrogen in the compound?

Accepted Answer

$$\frac{10.0}{40.0 + 10.0} 	imes 100 = 20\%$$

Question 7

Which of the following is the correct name for the compound P$$_2O$_5$$?

Accepted Answer

Diphosphorus pentoxide

Question 8

Which of the following statements about the electromagnetic spectrum is correct?

Accepted Answer

Microwaves have lower energy than ultraviolet light.

Question 9

A reaction has a theoretical yield of 50.0 g and an actual yield of 42.0 g. What is the percent yield?

Accepted Answer

$$\frac{42.0}{50.0} 	imes 100\% = 84\%$$

Question 10

Which of the following is the correct formula for the acetate ion?

Accepted Answer

C$$_2H$_3O$_2^-$$

Question 11

If 2.0 mol of an ideal gas occupies 44.8 L at STP, what is the molar volume of the gas at STP?

Accepted Answer

$$\frac{44.8\ 	ext{L}}{2.0\ 	ext{mol}} = 22.4\ 	ext{L/mol}$$

Question 12

Which of the following ions is most likely to form a precipitate with Ag$$^+ in $$aqueous solution?

Accepted Answer

Cl$$^-$$

Question 13

Which of the following is the correct conversion between units of pressure?

Accepted Answer

$$1\ 	ext{atm} = 760\ 	ext{mm Hg}$$

Question 14

Which of the following compounds contains a cation and an anion that are both polyatomic ions?

Accepted Answer

NH$$_4NO$_3$$

Question 15

Which of the following best describes the trend in atomic radius as you move down a group in the periodic table?

Accepted Answer

Atomic radius increases

Question 16

A sample of gas at 300 K and 1.0 atm has a volume of 10.0 L. If the temperature is increased to 600 K at constant pressure, what is the new volume?

Accepted Answer

$$V_2$$ = $$V_1$$ \frac{$$T_2$$}{$$T_1$$} = 10.0 	imes \frac{600}{300} = 20.0\ 	ext{L}$$

Question 17

Which of the following is the correct formula for the dichromate ion?

Accepted Answer

Cr$$_2O$_7^{2-}$$

Question 18

Which of the following best describes the relationship between wavelength and energy in the electromagnetic spectrum?

Accepted Answer

As wavelength increases, energy decreases

Question 19

Which of the following is the correct Greek prefix for 7 atoms in a binary molecular compound?

Accepted Answer

hepta-

Question 20

Which of the following elements has the highest electronegativity?

Accepted Answer

Fluorine (F)

CHEM 103 Final Exam Comprehensive Study Guide

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