Q: Calculate the energy of a photon with a wavelength of $500\ \mathrm{nm}$. ($h = 6.626 \times 10^{-34}\ \mathrm{J\cdot s}$, $c = 3.00 \times 10^8\ \mathrm{m/s}$)

$3.98 \times 10^{-19}\ \mathrm{J}$

Question 1

A solution is prepared by dissolving 10.0 g of NaCl in enough water to make 500 mL of solution. What is the molarity of the solution? (Molar mass of NaCl = 58.44 g/mol)

Accepted Answer

$0.34\ \mathrm{M}$

Question 2

Which of the following compounds is expected to be insoluble in water according to the solubility rules?

Accepted Answer

$\mathrm{AgCl}$

Question 3

A 250 mL sample of 0.50 M HCl is diluted to a final volume of 1.00 L. What is the new concentration?

Accepted Answer

$0.10\ \mathrm{M}$

Question 4

Which of the following is a strong electrolyte?

Accepted Answer

$\mathrm{NaCl}$

Question 5

Which of the following is the correct net ionic equation for the reaction between aqueous solutions of Na$_2$SO$_4$ and BaCl$_2$?

Accepted Answer

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

Question 6

Which of the following acids is classified as a strong acid?

Accepted Answer

$\mathrm{HNO_3}$

Question 7

What is the total ionic equation for the reaction between HCl(aq) and NaOH(aq)?

Accepted Answer

$\mathrm{H^+(aq) + Cl^-(aq) + Na^+(aq) + OH^-(aq) \rightarrow Na^+(aq) + Cl^-(aq) + H_2O(l)}$

Question 8

Which of the following is the correct formula for the permanganate ion?

Accepted Answer

$\mathrm{MnO_4^-}$

Question 9

A student mixes solutions of Pb(NO$_3$)$_2$ and KI. What is the precipitate formed?

Accepted Answer

$\mathrm{PbI_2}$

Question 10

Which of the following is the correct oxidation state of nitrogen in nitrate ion ($\mathrm{NO_3^-}$)?

Accepted Answer

$+5$

Question 11

Which of the following is a correct statement about the photoelectric effect?

Accepted Answer

Electrons are emitted from a metal surface only if the incident light has a frequency above a certain threshold.

Question 12

Calculate the energy of a photon with a wavelength of $500\ \mathrm{nm}$. ($h = 6.626 	imes 10^{-34}\ \mathrm{J\cdot s}$, $c = 3.00 	imes 10^8\ \mathrm{m/s}$)

Accepted Answer

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

Question 13

Which quantum number determines the shape of an orbital?

Accepted Answer

Azimuthal quantum number ($l$)

Question 14

What is the electron configuration for the Fe$^{3+}$ ion?

Accepted Answer

$[Ar]\ 3d^5$

Question 15

Which of the following ions is isoelectronic with Ne?

Accepted Answer

$\mathrm{F^-}$

Question 16

Which element has the highest first ionization energy?

Accepted Answer

Neon

Question 17

Which of the following statements about lattice energy is correct?

Accepted Answer

Lattice energy increases as the charges of the ions increase and the ionic radii decrease.

Question 18

Which of the following ions has the largest radius?

Accepted Answer

$\mathrm{S^{2-}}$

Question 19

Which of the following is the correct formula for the chromate ion?

Accepted Answer

$\mathrm{CrO_4^{2-}}$

Question 20

Which of the following transitions in the Bohr model of the hydrogen atom would emit the highest energy photon?

Accepted Answer

$n=3 \rightarrow n=1$

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