Q: Which equation is used to calculate the molarity ($$M) of a $$solution?

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

Question 1

Which of the following is the correct net ionic equation for the reaction between aqueous sodium sulfate and barium chloride?

Accepted Answer

$$\mathrm{Ba}^{2+} (aq) + \mathrm{SO}_4$$^{2-}$$ (aq) \rightarrow \mathrm{BaSO}_4 (s)$$

Question 2

A student mixes 50.0 mL of 0.200 M NaOH with 25.0 mL of 0.100 M HCl. What is the limiting reactant and how many moles of NaCl are formed?

Accepted Answer

HCl is limiting; $$0.0025$$ mol NaCl formed

Question 3

Which of the following best describes the role of a spectator ion in a chemical reaction?

Accepted Answer

It remains unchanged and does not participate in the reaction.

Question 4

A 2.00 g sample of magnesium reacts with excess hydrochloric acid to produce hydrogen gas. What is the theoretical yield of hydrogen gas in grams? ($$\mathrm{Mg} + 2\mathrm{HCl} \rightarrow \mathrm{MgCl}_2 + \mathrm{H}_2$$; $$M_{\mathrm{Mg}} = 24.3 g/$$mol, $$M_{\mathrm{H}_2$$} = 2.02$$ g/mol)

Accepted Answer

$$0.166 g$

Question 5

Which equation is used to calculate the molarity ($$M) of a $$solution?

Accepted Answer

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

Question 6

A 250 mL sample of 0.400 M KNO$$_3 is $$diluted to 1.00 L. What is the new concentration?

Accepted Answer

$$0.100 M$$

Question 7

Which of the following is a redox reaction?

Accepted Answer

$$\mathrm{Zn} (s) + \mathrm{CuSO}_4 (aq) \rightarrow \mathrm{ZnSO}_4 (aq) + \mathrm{Cu} (s)$$

Question 8

Which gas law relates the volume and temperature of a gas at constant pressure?

Accepted Answer

$$V_1$$/$$T_1$$ = $$V_2$$/$$T_2$$

Question 9

A gas occupies 3.00 L at 2.00 atm and 300 K. What will its volume be at 1.00 atm and 300 K?

Accepted Answer

$$6.00 L$$

Question 10

Which equation is used to calculate the density ($$d) of a $$gas using the ideal gas law?

Accepted Answer

$$d = \dfrac{PM}{RT}$$

Question 11

A sample of oxygen gas is collected over water at 25°C. The total pressure is 755 mmHg and the vapor pressure of water is 23.8 mmHg. What is the partial pressure of oxygen?

Accepted Answer

$$731.2$$ mmHg

Question 12

According to Graham’s Law, which gas will effuse faster: hydrogen ($$M = 2.02 g/$$mol) or oxygen ($$M = 32.0 g/$$mol)?

Accepted Answer

Hydrogen, because it has a lower molar mass

Question 13

Which equation relates the speed of light ($$c$$), frequency ($$
u$$), and wavelength ($$\lambda$$)?

Accepted Answer

$$c = 
u \lambda$$

Question 14

What is the energy of a photon with a wavelength of $$500 nm$$? ($$h = 6.626 	imes 10$$^{-34}$$ J·s, c = 3.00$$ 	imes $$10^8 m/s)$$

Accepted Answer

$$3.98 	imes 10$$^{-19}$$ J

Question 15

Which quantum number determines the shape of an atomic orbital?

Accepted Answer

Angular momentum quantum number ($$l)$$

Question 16

How many electrons can occupy the $$3p$$ subshell?

Accepted Answer

6

Question 17

Which element has the highest first ionization energy?

Accepted Answer

Neon

Question 18

Which of the following atoms is paramagnetic?

Accepted Answer

O ($$1s^2$$ $$2s^2$$ $$2p^4)$$

Question 19

Which of the following ions is isoelectronic with argon?

Accepted Answer

$$\mathrm{Cl}^-$$

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