Question 1

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

Accepted Answer

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

Question 2

A solution is prepared by dissolving $$0.50$$ mol of $$\mathrm{Na_2SO_4} in $$enough water to make $$1.0 L of $$solution. What is the concentration of $$\mathrm{SO_4$^{2-}}$$ ions in the solution?

Accepted Answer

$$0.50 M$$

Question 3

Which of the following best describes a precipitation reaction?

Accepted Answer

A reaction in which a solid forms from the mixing of two aqueous solutions.

Question 4

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

Accepted Answer

$$\mathrm{AgCl}$$

Question 5

What is the net ionic equation for the reaction between $$\mathrm{Na_2SO_4}$$ and $$\mathrm{$$BaCl_2$$} in $$aqueous solution?

Accepted Answer

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

Question 6

Which of the following is a weak acid?

Accepted Answer

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

Question 7

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

Accepted Answer

$$50.0 mL$$

Question 8

Which of the following statements about oxidation and reduction is correct?

Accepted Answer

Oxidation is the loss of electrons; reduction is the gain of electrons.

Question 9

What is the oxidation number of sulfur in $$\mathrm{SO_4$^{2-}}$$?

Accepted Answer

$$+6$$

Question 10

A solution is made by diluting $$50.0 mL of$$ $$2.00 M$$ $$\mathrm{NaOH} to a $$final volume of $$200.0 mL. $$What is the final concentration?

Accepted Answer

$$0.25 M$$

Question 11

Which of the following is the correct formula for calculating the energy of a photon?

Accepted Answer

$$E = h 
u$$

Question 12

What is the wavelength (in nm) of light with a frequency of $$6.0 	imes 10$$^{14}$$ Hz? (c = 3.0$$ 	imes $$10^8 m/s)$$

Accepted Answer

$$500 nm$$

Question 13

Which quantum number defines the shape of an atomic orbital?

Accepted Answer

Angular momentum quantum number ($$l)$$

Question 14

How many electrons can occupy a $$3p$$ subshell?

Accepted Answer

$$6$$

Question 15

Which of the following elements has the electron configuration $$[Ne] 3s^2$ 3p^1$?

Accepted Answer

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

Question 16

Which statement about the first law of thermodynamics is correct?

Accepted Answer

The total energy of the universe is constant.

Question 17

A $$100.0 g $$sample of water ($$C = 4.18 J/g$\cdot$$°C) absorbs $$836 J of $$heat. What is the temperature change ($$\Delta T$$)?

Accepted Answer

$$2.0$$ °C

Question 18

Which of the following processes is exothermic?

Accepted Answer

Combustion of methane

Question 19

Given the enthalpies of formation: $$\Delta H_f^\circ (\mathrm{CO_2$}) = -393.5 kJ/$$mol, $$\Delta H_f^\circ (\mathrm{H_2O}) = -285.8 kJ/$$mol, $$\Delta H_f^\circ (\mathrm{CH_4$}) = -74.8 kJ/$$mol, calculate $$\Delta H_{rxn}$$ for the combustion of methane: $$\mathrm{CH_4$ (g) + 2 O_2$ (g) \rightarrow CO_2$ (g) + 2 H_2O (l)}.$$

Accepted Answer

$$-890.3 kJ$$

Question 20

Which of the following is a state function?

Accepted Answer

Enthalpy ($$H)$$

General Chemistry Study Guide: Chapters 4, 5, and 6 (Aqueous Reactions, Thermochemistry, Electronic Structure)

Guida di studio - Domande di pratica

Study guide - Flashcard