Q: Which salt would you use to complete a buffer system with acetic acid ($$\text{CH}_3\text{COOH}$$)?

$$\text{NaC}_2\text{H}_3\text{O}_2$$

Q: Which of the following is the correct balanced equation for the reaction between aqueous solutions of lead (II) nitrate and aluminum bromide?

$$3\text{Pb(NO}_3)_2(aq) + 2\text{AlBr}_3(aq) \rightarrow 3\text{PbBr}_2(s) + 2\text{Al(NO}_3)_3(aq)$$

Question 1

A pediatric patient weighs 43.5 lb. The dose for ibuprofen for this age group is 8.50 mg/kg. How many mg of ibuprofen should this patient receive? (1 kg = 2.205 lb)

Accepted Answer

$$168\ 	ext{mg}$$

Question 2

Children’s Tylenol Oral Suspension is sold as a solution with a concentration of 160 mg/5.0 mL. For a patient of four to five years, the dose for a fever is 7.5 mL. How many milligrams of Tylenol is the patient receiving with this dose?

Accepted Answer

$$240\ 	ext{mg}$$

Question 3

A patient has a measured temperature of $$38.2\ ^\circ	ext{C}. $$Convert this temperature to Fahrenheit using the formula $$F = \frac{9}{5}C + 32. Is $$this considered a fever?

Accepted Answer

$$100.8\ ^\circ	ext{F}$$, yes

Question 4

A solution has a density of $$1.06\ 	ext{g/mL}. $$What is the volume of a $$25\ 	ext{g}$$ sample of this solution? Use $$	ext{Density} = \frac{	ext{mass}}{	ext{volume}}.$$

Accepted Answer

$$24\ 	ext{mL}$$

Question 5

What is the molecular shape and polarity of carbon tetrachloride ($$	ext{CCl}_4$$)?

Accepted Answer

Tetrahedral, nonpolar

Question 6

Calculate the mass of aspirin needed to make $$500.0\ 	ext{mL} of a$$ $$0.125\ 	ext{M}$$ solution. The molar mass of aspirin is $$180.16\ 	ext{g/mol}.$$

Accepted Answer

$$11.3\ 	ext{g}$$

Question 7

What is the pH of a solution with $$[	ext{H}_3	ext{O}^+] = 2.7 	imes 10$$^{-5}$$? Use $$	ext{pH} = -\log [	ext{H}_3	ext{O}^+]$$.

Accepted Answer

$$4.57$$

Question 8

At STP, what is the volume of $$48.5\ 	ext{g} of $$oxygen gas ($$	ext{O}_2$$)? ($$1\ 	ext{mol} = 22.4\ 	ext{L}$$, molar mass $$	ext{O}_2 = 32.0\ 	ext{g/mol})$$

Accepted Answer

$$34.0\ 	ext{L}$$

Question 9

Calculate the $$[	ext{OH}^-] at $$room temperature if the $$[	ext{H}_3	ext{O}^+]$$ concentration is $$5.62 	imes 10$$^{-11}$$. (K_w = 1.0$$ 	imes $$10^{-14} at$$ $$25^\circ	ext{C}$$, $$K_w = [	ext{H}_3	ext{O}^+][	ext{OH}^-])$$

Accepted Answer

$$1.78 	imes 10$$^{-4}$$

Question 10

Given a pressure of $$1.04\ 	ext{atm}$$ and a volume of $$552\ 	ext{mL}$$, what would the new volume be if the pressure is increased to $$3.00\ 	ext{atm}$$? (Assume temperature is constant. Use $$P_1V_1 = P_2V_2)$$

Accepted Answer

$$191\ 	ext{mL}$$

Question 11

Which intermolecular force is most prevalent in sulfur dibromide ($$	ext{SBr}_2$$)?

Accepted Answer

Dispersion

Question 12

Which of the following compounds is a strong electrolyte when dissolved in water?

Accepted Answer

$$	ext{NaNO}_3$$

Question 13

Which of the following best describes the molecular geometry of ammonia ($$	ext{NH}_3$$)?

Accepted Answer

Trigonal pyramidal

Question 14

Which salt would you use to complete a buffer system with acetic acid ($$	ext{CH}_3	ext{COOH}$$)?

Accepted Answer

$$	ext{NaC}_2	ext{H}_3	ext{O}_2$$

Question 15

Which of the following molecules contains a chiral carbon?

Accepted Answer

A molecule with four different groups attached to a single carbon

Question 16

Which of the following is the correct balanced equation for the reaction between aqueous solutions of lead (II) nitrate and aluminum bromide?

Accepted Answer

$$3	ext{Pb(NO}_3)_2(aq) + 2	ext{AlBr}_3(aq) ightarrow 3	ext{PbBr}_2(s) + 2	ext{Al(NO}_3)_3(aq)$$

Question 17

Which of the following best describes the functional group change in the dehydration of 3,5-dimethylcyclohexanol under acidic conditions with heat?

Accepted Answer

Alcohol to alkene

Question 18

Which of the following is the correct molar mass for $$	ext{K}_3	ext{PO}_4$$?

Accepted Answer

$$212.27\ 	ext{g/mol}$$

Question 19

Which of the following best describes the most prevalent intermolecular force in water?

Accepted Answer

Hydrogen bonding

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