Q: What is the de Broglie wavelength of an electron ($$m = 9.11 \times 10$$^{-31}$$\ \mathrm{kg}) $$moving at $$2.00 \times 10^6$\ \mathrm{m/s}$$? ($$h = 6.63 \times 10$$^{-34}$$\ \mathrm{J\cdot s})$$

$$3.64 \times 10$$^{-10}$$\ \mathrm{m}$$

Question 1

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

Accepted Answer

Sodium chloride, $$\mathrm{NaCl}$$

Question 2

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 3

Which of the following acids is NOT one of the seven strong acids?

Accepted Answer

$$\mathrm{H_2SO_3}$$

Question 4

A student mixes $$25.0\ \mathrm{mL} of$$ $$0.200\ \mathrm{M}$$ $$\mathrm{H_2SO_4}$$ with $$50.0\ \mathrm{mL} of$$ $$0.100\ \mathrm{M}$$ $$\mathrm{NaOH}. $$What is the limiting reactant?

Accepted Answer

$$\mathrm{NaOH}$$

Question 5

Which element is oxidized in the following reaction?

$$\mathrm{Zn(s) + 2HCl(aq) \rightarrow $$ZnCl_2$$(aq) + H_2$(g)}$$

Accepted Answer

Zinc

Question 6

Given the activity series (Zn \u003e Fe \u003e Pb \u003e Cu), which of the following reactions will occur spontaneously?

Accepted Answer

$$\mathrm{Fe(s) + Pb$$^{2+}$$(aq) \rightarrow Fe$$^{2+}$$(aq) + Pb(s)}$$

Question 7

What is the final concentration when $$10.0\ \mathrm{mL} of$$ $$6.0\ \mathrm{M}$$ HCl is diluted to a total volume of $$250.0\ \mathrm{mL}$$?

Accepted Answer

$$0.24\ \mathrm{M}$$

Question 8

A $$50.0\ \mathrm{g}$$ sample of metal at $$100.0^\circ\mathrm{C} is $$placed in $$100.0\ \mathrm{g} of $$water at $$25.0^\circ\mathrm{C}. $$The final temperature is $$30.0^\circ\mathrm{C}. $$What is the specific heat ($$c) of $$the metal? ($$c_{\mathrm{H_2O}} = 4.18\ \mathrm{J/g\cdot ^\circ C})$$

Accepted Answer

$$0.42\ \mathrm{J/g\cdot ^\circ C}$$

Question 9

Which of the following statements about state functions is correct?

Accepted Answer

Enthalpy ($$\Delta H) is a $$state function.

Question 10

Which process is exothermic?

Accepted Answer

Combustion of methane

Question 11

Calculate $$\Delta H$$ for the reaction: $$\mathrm{2H_2(g) + O_2$(g) \rightarrow 2H_2O(l)}$$, given $$\Delta H_f^\circ [\mathrm{H_2O(l)}] = -285.8\ \mathrm{kJ/mol}.$$

Accepted Answer

$$-571.6\ \mathrm{kJ}$$

Question 12

Which formula correctly relates the energy of a photon to its frequency?

Accepted Answer

$$E = h
u$$

Question 13

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

Accepted Answer

$$500\ \mathrm{nm}$$

Question 14

Which set of quantum numbers is NOT allowed for an electron in an atom?

Accepted Answer

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

Question 15

Which electron configuration represents the ground state of copper ($$\mathrm{Cu}$$)?

Accepted Answer

$$[\mathrm{Ar}]\ 4s^1$\ 3d$$^{10}$$

Question 16

What is the de Broglie wavelength of an electron ($$m = 9.11 	imes 10$$^{-31}$$\ \mathrm{kg}) $$moving at $$2.00 	imes 10^6$\ \mathrm{m/s}$$? ($$h = 6.63 	imes 10$$^{-34}$$\ \mathrm{J\cdot s})$$

Accepted Answer

$$3.64 	imes 10$$^{-10}$$\ \mathrm{m}$$

Question 17

Which of the following best describes the shape of a $$p$$ orbital?

Accepted Answer

Dumbbell-shaped

Question 18

A $$25.0\ \mathrm{mL}$$ sample of $$0.150\ \mathrm{M}$$ $$\mathrm{HCl} is $$titrated with $$0.100\ \mathrm{M}$$ $$\mathrm{NaOH}. $$What volume of $$\mathrm{NaOH} is $$required to reach the equivalence point?

Accepted Answer

$$37.5\ \mathrm{mL}$$

Question 19

Which of the following reactions is a metathesis (double displacement) reaction?

Accepted Answer

$$\mathrm{$$AgNO_3$$(aq) + NaCl(aq) \rightarrow AgCl(s) + $$NaNO_3$$(aq)}$$

Exam II Study Guide: Reactions in Aqueous Solution, Thermochemistry, and Electronic Structure

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