Q: What is the energy (in joules) of a photon with a wavelength of 0.0010 m? Use $$h = 6.626 \times 10$$^{-34}$$\ \mathrm{J\cdot s}$$ and $$c = 3.00 \times 10^8$\ \mathrm{m/s}.$$

$$2.0 \times 10$$^{-22}$$\ \mathrm{J}$$

Question 1

How many grams of AgNO$$_3$$ are required to prepare 250 mL of a 0.135 M solution? (Molar mass of AgNO$$_3 = 169.87 g/$$mol)

Accepted Answer

8.03 g

Question 2

A 10.00 mL sample of HCl is titrated with 0.1250 M NaOH. If it takes 12.33 mL of NaOH to reach the endpoint, what is the concentration of the HCl solution?

Accepted Answer

$$0.1014\ \mathrm{M}$$

Question 3

The concentration of SO$$_4$$^{2-}$$ is 0.500 M in a solution of Al_2$(SO_4$)_3$. What is the molar concentration of Al$$^{3+}$$ in the solution?

Accepted Answer

$$0.333\ \mathrm{M}$$

Question 4

What is the oxidation number of sulfur in Al$$_2(SO$_4$$)$$_3$$?

Accepted Answer

+6

Question 5

Which statement best describes an atomic orbital?

Accepted Answer

A region in space around the nucleus where there is a high probability that the electron can be found

Question 6

How many valence electrons does an atom of aluminum (Al) have?

Accepted Answer

3

Question 7

Which set of quantum numbers (n, l, m$$_l$$, m$$_s) is $$not possible for an electron in an atom?

Accepted Answer

2, 0, 1, -\frac{1}{2}

Question 8

What is the energy (in joules) of a photon with a wavelength of 0.0010 m? Use $$h = 6.626 	imes 10$$^{-34}$$\ \mathrm{J\cdot s}$$ and $$c = 3.00 	imes 10^8$\ \mathrm{m/s}.$$

Accepted Answer

$$2.0 	imes 10$$^{-22}$$\ \mathrm{J}$$

Question 9

Which of the following is the correct complete ground state electron configuration for sulfur (S)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^4$$

Question 10

Which of the following is the correct name for NaClO$$_4$$?

Accepted Answer

Sodium perchlorate

Question 11

What is the molecular formula for calcium phosphate?

Accepted Answer

Ca$$_3(PO$_4$$)$$_2$$

Question 12

A 30.0 mL sample of 0.300 M Hg$$_2(NO$_3$$)$$_2 is $$mixed with 25.0 mL of 0.500 M NaBr. What is the maximum mass of Hg$$_2Br$_2 ($$molar mass = 560.0 g/mol) that can be produced?

Accepted Answer

2.52 g

Question 13

Which of the following is the correct net ionic equation for the reaction between Ba(NO$$_3$$)$$_2 (aq) $$and Na$$_2SO$_4 (aq$$)?

Accepted Answer

$$\mathrm{Ba$$^{2+}$$ (aq) + SO_4$^{2-} (aq) \rightarrow $$BaSO_4$$ (s)}$$

Question 14

Which of the following is the correct balanced molecular equation for the reaction between Al$$_2(SO$_4$$)$$_3 (aq) $$and KOH (aq), where the only precipitate contains aluminum ion?

Accepted Answer

$$\mathrm{Al_2$(SO_4$)_3 (aq) + 6 KOH (aq) \rightarrow 2 Al(OH)_3 (s) + 3 K_2SO_4 (aq)}$$

Question 15

Which of the following is the correct net ionic equation for the neutralization of HCN (aq) with Ca(OH)$$_2 (aq$$)?

Accepted Answer

$$2\mathrm{HCN (aq) + 2 OH^- (aq) \rightarrow 2 CN^- (aq) + 2 H_2O (l)}$$

Question 16

Which of the following is the correct name for (NH$$_4$$)$$_2CO$_3$$?

Accepted Answer

Ammonium carbonate

Question 17

Which of the following is the correct formula for aluminum cyanide?

Accepted Answer

Al(CN)$$_3$$

Question 18

Which of the following is the correct balanced half-reaction for MnO$$_4^- to $$MnO$$_2 in $$acidic solution?

Accepted Answer

$$\mathrm{$$MnO_4$$^- + 4 H^+ + 2 e^- \rightarrow $$MnO_2$$ + 2 H_2O}$$

Chemistry 1210 Midterm Study Guidance

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