Question 1

Which of the following statements correctly describes the number and type of subatomic particles in the ion $$^{27}_{13}\mathrm{Al}^{3+}$$?

Accepted Answer

13 protons, 14 neutrons, 10 electrons

Question 2

Which of the following is the correct formula for ammonium sulfate?

Accepted Answer

$$\mathrm{(NH_4$)_2SO_4}$$

Question 3

A sample contains 18.0 g of glucose ($$\mathrm{C_6H_{12}O_6$}). $$How many moles of glucose are present? (Molar mass of $$\mathrm{C_6H_{12}O_6$} = 180 g/$$mol)

Accepted Answer

$$0.10$$ mol

Question 4

Which of the following elements has the highest first ionization energy?

Accepted Answer

Neon ($$\mathrm{Ne})$$

Question 5

A photon has a wavelength of $$4.00 	imes 10$$^{-7}$$ m. What is its energy? (h = 6.626$$ 	imes $$10^{-34} J$$·s, $$c = 3.00 	imes 10^8$ m/s)

Accepted Answer

$$4.97 	imes 10$$^{-19}$$ J

Question 6

Which of the following is a balanced molecular equation for the reaction between aqueous sodium carbonate and hydrochloric acid?

Accepted Answer

$$\mathrm{Na_2CO_3(aq) + 2HCl(aq) \rightarrow 2NaCl(aq) + H_2O(l) + CO_2$(g)}$$

Question 7

A 0.250 M solution of $$\mathrm{NaCl} is $$prepared by dissolving $$14.6 g of$$ $$\mathrm{NaCl} in $$water. What is the final volume of the solution? (Molar mass of $$\mathrm{NaCl} = 58.44 g/$$mol)

Accepted Answer

$$1.00 L$$

Question 8

Which of the following reactions is exothermic and would have a negative $$\Delta H$$?

Accepted Answer

Combustion of methane: $$\mathrm{CH_4$(g) + 2O_2(g) \rightarrow CO_2$(g) + 2H_2O(l)}$$

Question 9

Which of the following molecules is nonpolar, despite having polar bonds?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 10

Which type of intermolecular force is primarily responsible for the high boiling point of water compared to methane?

Accepted Answer

Hydrogen bonding

Question 11

A sample of gas occupies $$2.50 L at$$ $$1.00$$ atm and $$300 K. $$What will be its volume at $$2.00$$ atm and $$300 K$$, assuming ideal behavior?

Accepted Answer

$$1.25 L$$

Question 12

Which of the following best explains why increasing the temperature increases the rate of a chemical reaction?

Accepted Answer

It increases the fraction of molecules with energy greater than the activation energy.

Question 13

For the reaction $$\mathrm{N_2O_4(g) \rightleftharpoons 2NO_2(g)}$$, the equilibrium constant expression is:

Accepted Answer

$$K = \dfrac{[NO_2$]^2}{[N_2O_4]}$$

Question 14

A saturated solution of $$\mathrm{AgCl}$$ has a $$K_{sp} of$$ $$1.8 	imes 10$$^{-10}$$ at 25$$^\circ$$C. What is the molar solubility of $$\mathrm{AgCl}$$ in water?

Accepted Answer

$$1.3 	imes 10$$^{-5}$$ mol/L

Question 15

Which of the following solutions will have a pH greater than 7?

Accepted Answer

A solution of $$\mathrm{Na_2CO_3}$$

Question 16

A $$25.0 mL $$sample of $$0.100 M$$ $$\mathrm{HCl} is $$titrated with $$0.100 M$$ $$\mathrm{NaOH}. $$What is the pH at the equivalence point?

Accepted Answer

7.00

Question 17

Which of the following correctly describes the flow of electrons in a galvanic cell?

Accepted Answer

From anode to cathode through the external circuit

Question 18

A current of $$2.00 A is $$passed through a solution of $$\mathrm{$$CuSO_4$$}$$ for $$1.50$$ hours. How many grams of copper are deposited at the cathode? ($$1$$ Faraday $$= 96,485 C/$$mol, molar mass of Cu $$= 63.55 g/$$mol)

Accepted Answer

$$7.12 g$$

General Chemistry I: Comprehensive Study Guide by Unit

Guida di studio - Domande di pratica

Study guide - Flashcard