Q: A moving baseball (mass = 0.145 kg) travels at 40.0 m/s. What is its de Broglie wavelength? ($$h = 6.626 \times 10$$^{-34}$$\ \mathrm{J\cdot s}$$) $$\lambda = \dfrac{h}{mv}$$

$$1.14 \times 10$$^{-34}$$\ \mathrm{m}$$

Question 1

A 2.50 g sample of magnesium reacts completely with hydrochloric acid according to the equation:

$$\mathrm{Mg(s) + 2HCl(aq) \rightarrow $$MgCl_2$$(aq) + H_2$(g)}$$

How many grams of hydrogen gas are produced? (Molar masses: Mg = 24.3 g/mol, H$$_2 = 2.02 g/$$mol)

Accepted Answer

0.208 g

Question 2

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

Accepted Answer

Sodium chloride ($$\mathrm{NaCl})$$

Question 3

A solution is prepared by dissolving 10.0 g of NaOH in enough water to make 500.0 mL of solution. What is the molarity of the solution? (Molar mass of NaOH = 40.0 g/mol)

Accepted Answer

$$0.50\ \mathrm{M}$$

Question 4

Which of the following is the correct net ionic equation for the reaction between aqueous solutions of silver nitrate and sodium chloride?

Accepted Answer

$$\mathrm{Ag^+(aq) + Cl^-(aq) \rightarrow AgCl(s)}$$

Question 5

A 25.0 mL sample of 0.200 M HCl is titrated with 0.100 M NaOH. What volume of NaOH is required to reach the equivalence point?

$$\mathrm{HCl(aq) + NaOH(aq) \rightarrow NaCl(aq) + H_2O(l)}$$

Accepted Answer

50.0 mL

Question 6

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

Accepted Answer

Gamma rays have the highest energy among all electromagnetic waves.

Question 7

What is the wavelength (in nm) of light with a frequency of $$6.00 	imes 10$$^{14}$$\ \mathrm{Hz}$$? (Speed of light $$c = 3.00 	imes 10^8$\ \mathrm{m/s})$$

Accepted Answer

500 nm

Question 8

Which of the following sets of quantum numbers is NOT allowed for an electron in an atom?

Accepted Answer

$$n=2,\ l=2,\ m_l=0,\ m_s=+\frac{1}{2}$$

Question 9

Which element has the highest first ionization energy?

Accepted Answer

Neon ($$\mathrm{Ne})$$

Question 10

A 100.0 mL sample of 1.00 M NaCl is diluted to a final volume of 500.0 mL. What is the new concentration?

Accepted Answer

$$0.20\ \mathrm{M}$$

Question 11

Which of the following is oxidized in the reaction below?

$$\mathrm{2Al(s) + 3Cu$$^{2+}$$(aq) \rightarrow 2Al$$^{3+}$$(aq) + 3Cu(s)}$$

Accepted Answer

$$\mathrm{Al(s)}$$

Question 12

Which of the following is a weak acid?

Accepted Answer

Acetic acid ($$\mathrm{CH_3COOH})$$

Question 13

What is the percent yield if 5.00 g of product is obtained from a reaction with a theoretical yield of 8.00 g?

Accepted Answer

$$62.5\%$$

Question 14

Which of the following best describes the trend in atomic radius across a period from left to right?

Accepted Answer

Atomic radius decreases due to increasing effective nuclear charge.

Question 15

A moving baseball (mass = 0.145 kg) travels at 40.0 m/s. What is its de Broglie wavelength? ($$h = 6.626 	imes 10$$^{-34}$$\ \mathrm{J\cdot s}$$)

$$\lambda = \dfrac{h}{mv}$$

Accepted Answer

$$1.14 	imes 10$$^{-34}$$\ \mathrm{m}$$

Question 16

Which of the following is the correct electron configuration for the $$\mathrm{Fe$$^{3+}$$}$$ ion?

Accepted Answer

$$[Ar]\ 3d^5$

Question 17

Which of the following is the oxidizing agent in the reaction below?

$$\mathrm{Zn(s) + $$CuSO_4$$(aq) \rightarrow $$ZnSO_4$$(aq) + Cu(s)}$$

Accepted Answer

$$\mathrm{Cu$$^{2+}$$(aq)}$$

Question 18

A 0.250 M solution of acetic acid ($$\mathrm{CH_3COOH}) is $$classified as which of the following?

Accepted Answer

Weak acid

Question 19

Which of the following best describes the role of water in a solution of NaCl(aq)?

Accepted Answer

Water is the solvent.

Question 20

A 50.0 mL sample of 0.100 M $$\mathrm{$$AgNO_3$$} is $$mixed with 50.0 mL of 0.100 M $$\mathrm{NaCl}. $$What mass of $$\mathrm{AgCl}$$ will precipitate? (Molar mass $$\mathrm{AgCl} = 143.3\ \mathrm{g/mol})$$

Accepted Answer

0.716 g

General Chemistry Study Guide: Composition of Solutions, Reactions in Aqueous Solutions, and Periodicity

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