Q: Which of the following is a correct conversion factor for pressure units?

$$1 \text{ atm} = 101.325 \text{ kPa}$$

Q: Which of the following equations correctly converts Celsius to Fahrenheit?

$$^\circ \text{F} = ( ^\circ \text{C} \times \frac{9}{5} ) + 32$$

Question 1

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons.

Question 2

A student measures the mass and volume of a silver sample as 290.4 g and 63.498 mL, respectively. How many significant figures should the calculated density have?

Accepted Answer

four

Question 3

Which of the following ionic compounds is insoluble in water?

Accepted Answer

PbSO\_4

Question 4

What is the empirical formula of a compound with the molecular formula C\_4H\_8O\_2?

Accepted Answer

C\_2H\_4O

Question 5

Calculate the number of atoms in 0.67 moles of hydrogen.

Accepted Answer

$$7.2 	imes 10$$^{23}$$

Question 6

Bromine is a liquid at room temperature and has a density of $$3.12 	ext{ g/mL} at$$ $$25^\circ 	ext{C}. $$What volume is occupied by $$50.0 	ext{ g} of $$bromine?

Accepted Answer

$$16.0 	ext{ mL}$$

Question 7

Which of the following elements has the largest atomic mass?

Accepted Answer

bromine

Question 8

The complete combustion of ethane yields carbon dioxide and water. When the equation is balanced, what is the ratio of the coefficients of CO\_2 to H\_2O?

Accepted Answer

2:3

Question 9

A sample contains 400 mL of 0.250 M KOH solution. How many grams of KOH are present?

Accepted Answer

$$5.61 	ext{ g}$$

Question 10

What is the percentage by mass of oxygen in silver sulfate, Ag\_2SO\_4?

Accepted Answer

$$43.5\%$$

Question 11

Which of the following is a malleable element?

Accepted Answer

Ag

Question 12

The oxidation number of Mn in KMnO\_4 is:

Accepted Answer

+7

Question 13

Calculate the atomic mass of an element if it has two naturally occurring isotopes with the following masses and abundances: Isotope A: 106.90509 amu (51.84%), Isotope B: 108.90476 amu (48.16%).

Accepted Answer

$$107.87 	ext{ amu}$$

Question 14

Which of the following compounds is correctly matched with its empirical formula?

Accepted Answer

C\_2H\_4O\_2: CH\_2O

Question 15

A reaction mixture contains 14.2 g CuSO\_4 and 2.00 mol H\_2SO\_4, yielding 2.40 g SO\_2. What is the percent yield for SO\_2?

Accepted Answer

$$48.2\%$$

Question 16

Which of the following is a correct conversion factor for pressure units?

Accepted Answer

$$1 	ext{ atm} = 101.325 	ext{ kPa}$$

Question 17

Which of the following equations correctly converts Celsius to Fahrenheit?

Accepted Answer

$$^\circ 	ext{F} = ( ^\circ 	ext{C} 	imes \frac{9}{5} ) + 32$$

Question 18

Which of the following is the correct molar mass for potassium sulfate, K\_2SO\_4?

Accepted Answer

$$174.26 	ext{ g/mol}$$

Question 19

Which of the following is the correct formula for Faraday's constant?

Accepted Answer

$$F = N_A 	imes e$$

Question 20

A chemist wants to prepare 100.0 mL of 1.00 M H\_2SO\_4 from 4.00 M H\_2SO\_4. What volume of the concentrated acid should be used?

Accepted Answer

$$25.0 	ext{ mL}$$

General Chemistry Study Guide: Fundamental Constants, Units, and Chemical Calculations

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