Q: What is the net ionic equation for the reaction between AgNO₃(aq) and Na₂S(aq)?

$$2\text{Ag}^+(aq) + \text{S}^{2-}(aq) \rightarrow \text{Ag}_2\text{S}(s)$$

Q: Calculate the frequency ($$\nu) of $$light with a wavelength $$\lambda = 600\ \text{nm}$$ using $$c = 3.00 \times 10^8$\ \text{m/s}.$$

$$5.00 \times 10$$^{14}$$\ \text{s}^{-1}$$

Q: Rank the following isoelectronic ions from largest to smallest radius: $$\text{O}^{2-}$$, $$\text{F}^-$$, $$\text{Na}^+$$, $$\text{Mg}^{2+}.$$

$$\text{O}^{2-} \u003e \text{F}^- \u003e \text{Na}^+ \u003e \text{Mg}^{2+}$$

Question 1

A student prepares a solution by dissolving 15.0 g of Na₂SO₄ (molar mass = 142.04 g/mol) in enough water to make 250.0 mL of solution. What is the molarity of Na₂SO₄ in the solution?

Accepted Answer

$$0.423\ 	ext{M}$$

Question 2

What is the concentration of $$	ext{Na}^+$$ ions in a $$0.250\ 	ext{M} Na$$₂SO₄ solution after complete dissociation?

Accepted Answer

$$0.500\ 	ext{M}$$

Question 3

A chemist dilutes $$40.0\ 	ext{mL} of$$ $$3.00\ 	ext{M}$$ HNO₃ to a final volume of $$500.0\ 	ext{mL}. $$What is the new molarity?

Accepted Answer

$$0.240\ 	ext{M}$$

Question 4

Which of the following mixtures will produce a precipitate according to the solubility rules?

Accepted Answer

BaCl₂(aq) + Na₂SO₄(aq)

Question 5

What is the net ionic equation for the reaction between AgNO₃(aq) and Na₂S(aq)?

Accepted Answer

$$2	ext{Ag}^+(aq) + 	ext{S}^{2-}(aq) ightarrow 	ext{Ag}_2	ext{S}(s)$$

Question 6

Which acid is classified as weak according to the study materials?

Accepted Answer

HF

Question 7

A $$25.0\ 	ext{mL}$$ sample of $$0.100\ 	ext{M} H$$₂SO₄ is titrated with NaOH. How many moles of NaOH are required for complete neutralization?

Accepted Answer

$$0.00500\ 	ext{mol}$$

Question 8

In the reaction $$	ext{Zn}(s) + 	ext{Cu}^{2+}(aq) ightarrow 	ext{Zn}^{2+}(aq) + 	ext{Cu}(s)$$, which species is oxidized?

Accepted Answer

Zn

Question 9

What is the oxidation number of chromium in $$	ext{Cr}_2	ext{O}_7$$^{2-}$$?

Accepted Answer

+6

Question 10

Which statement best describes dynamic equilibrium in a chemical system?

Accepted Answer

Forward and reverse reaction rates are equal.

Question 11

Calculate the frequency ($$
u) of $$light with a wavelength $$\lambda = 600\ 	ext{nm}$$ using $$c = 3.00 	imes 10^8$\ 	ext{m/s}.$$

Accepted Answer

$$5.00 	imes 10$$^{14}$$\ 	ext{s}^{-1}$$

Question 12

Which transition in a hydrogen atom releases more energy: $$n=4 \rightarrow n=2 or$$ $$n=3 \rightarrow n=2$$?

Accepted Answer

$$n=4 \rightarrow n=2$$ releases more energy because the energy gap is larger.

Question 13

According to the de Broglie equation $$\lambda = \frac{h}{mv}$$, if the speed of a particle doubles, what happens to its wavelength?

Accepted Answer

The wavelength is cut in half.

Question 14

For $$n=3$$, what values of $$\ell$$ are allowed?

Accepted Answer

$$\ell = 0, 1, 2$$

Question 15

Which set of quantum numbers is impossible?

Accepted Answer

$$n=2,\ \ell=2,\ m_\ell=0$$

Question 16

Which sublevel penetrates closest to the nucleus most strongly in a many-electron atom?

Accepted Answer

s

Question 17

Which rule states that electrons occupy equal-energy orbitals singly before pairing?

Accepted Answer

Hund's rule

Question 18

Rank the following isoelectronic ions from largest to smallest radius: $$	ext{O}^{2-}$$, $$	ext{F}^-$$, $$	ext{Na}^+$$, $$	ext{Mg}^{2+}.$$

Accepted Answer

$$	ext{O}^{2-} \u003e 	ext{F}^- \u003e 	ext{Na}^+ \u003e 	ext{Mg}^{2+}$$

Question 19

Which halogen is generally the most reactive according to periodic trends?

Accepted Answer

F

General Chemistry Exam 2 Study Guide: Solution Chemistry, Chemical Reactions, and Atomic Structure

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