Question 1

Which of the following best describes a chemical property of matter?

Accepted Answer

Iron rusts when exposed to oxygen

Question 2

A sample contains $$3.01 	imes 10$$^{23}$$ molecules of water. What is the mass of this sample? $$(	ext{Molar mass of } H_2O = 18.0 \ \mathrm{g/mol})$$

Accepted Answer

$$9.0 \ \mathrm{g}$$

Question 3

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons

Question 4

Which of the following is the correct balanced equation for the combustion of methane ($$CH_4) in $$oxygen?

Accepted Answer

$$CH_4 + 2O_2$$ \rightarrow $$CO_2 + 2H_2O$

Question 5

A solution is prepared by dissolving $$5.85 \ \mathrm{g} of$$ $$NaCl in $$enough water to make $$500 \ \mathrm{mL} of $$solution. What is the molarity of the solution? $$(	ext{Molar mass of } NaCl = 58.5 \ \mathrm{g/mol})$$

Accepted Answer

$$0.1 \ \mathrm{M}$$

Question 6

Which of the following gases will effuse the fastest under the same conditions, according to Graham's law?

Accepted Answer

$$NH_3$$

Question 7

Which of the following statements about exothermic reactions is true?

Accepted Answer

The enthalpy change $$(\Delta H) is $$negative

Question 8

Which electron configuration represents a ground state atom of sodium ($$Na$$)?

Accepted Answer

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

Question 9

Which element has the highest first ionization energy?

Accepted Answer

Neon

Question 10

Which of the following molecules is nonpolar?

Accepted Answer

$$CO_2$$

Question 11

Which of the following best explains why water has a higher boiling point than methane?

Accepted Answer

Water forms hydrogen bonds

Question 12

A sample of gas occupies $$10.0 \ \mathrm{L} at$$ $$2.00 \ \mathrm{atm}$$ and $$300 \ \mathrm{K}. $$What volume will it occupy at $$1.00 \ \mathrm{atm}$$ and $$300 \ \mathrm{K}$$? (Assume ideal gas behavior.)

Accepted Answer

$$20.0 \ \mathrm{L}$$

Question 13

Which of the following is a strong electrolyte in aqueous solution?

Accepted Answer

$$NaCl$$

Question 14

Which of the following best describes the geometry of $$BF_3$$ according to VSEPR theory?

Accepted Answer

Trigonal planar

Question 15

Which of the following is the net ionic equation for the reaction between $$Na_2SO_4$$ and $$BaCl_2 in $$aqueous solution?

Accepted Answer

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

Question 16

Which of the following statements about intermolecular forces is correct?

Accepted Answer

Hydrogen bonding occurs when hydrogen is bonded to N, O, or F

Question 17

A reaction has $$\Delta H = -100 \ \mathrm{kJ}$$ and $$\Delta S = +200 \ \mathrm{J/K}. At $$what temperature will the reaction become nonspontaneous? $$(\Delta G = \Delta H - T\Delta S)$$

Accepted Answer

$$T \u003e 500 \ \mathrm{K}$$

Question 18

Which of the following best describes the difference between a molecular compound and an ionic compound?

Accepted Answer

Molecular compounds are held together by covalent bonds

Question 19

Which of the following is the correct Lewis structure for $$CO_2$$?

Accepted Answer

O=C=O, with each O atom having two lone pairs

Question 20

Which of the following best explains why ionic solids conduct electricity when molten but not when solid?

Accepted Answer

Ions are fixed in place in the solid state but free to move in the molten state

General Chemistry I: Course Schedule and Chapter Overview

Guida di studio - Domande di pratica

Study guide - Flashcard