Q&A Hero

Q: How many moles of magnesium are needed to react with 0.50 mole of O2? A) 0.50 mole B) 1.0 moles C) 2.0 moles D) 3.0 moles E) 4.0 moles

Q: The number of moles of MgO produced when 0.20 mole of O2reacts completely is A) 0.10 mole. B) 0.20 mole. C) 0.40 mole. D) 0.60 mole. E) 0.80 mole.

Q: The number of moles of oxygen gas needed to react with 4.0 moles of Mg is A) 1.0 mole. B) 2.0 moles. C) 3.0 moles. D) 4.0 moles. E) 6.0 moles.

Q: Given the following equation, what is the correct form of the conversion factor needed to convert the number of moles of O2 to the number of moles of Fe2O3produced?4Fe(s) + 3O2 (g) -> 2Fe2O3(s)A) B) C) D) E)

Q: How many grams of glucose (C6H12O6) are in 3.55 moles of glucose? A) 180. g B) 639 g C) 103 g D) 426 g E) 50.7 g

Q: How many grams of Fe2O3 are there in 0.500 mole of Fe2O3? A) 79.9 g B) 35.9 g C) 63.8 g D) 51.9 g E) 160. g

Q: 1.25 moles of PbO2 have a mass of A) 191 g. B) 279 g. C) 178 g. D) 239 g. E) 299 g.

Q: 3.00 moles of NO2 have a mass of A) 138 g. B) 46.0 g. C) 30.0 g. D) 90.0 g. E) 45.0 g.

Q: How many moles of K2SO4 are in 15.0 g of K2SO4? A) 0.172 moles B) 2.61 x 103 moles C) 0.111 moles D) 0.0861 moles E) 0.119 moles

Q: Match the chemical name with the correct formula. A) MgSO3 B) MgSO4 C) MgS D) Mg(HSO4)2 E) Mg(HSO3)2 1> magnesium sulfate 2> magnesium hydrogen sulfate 3> magnesium sulfide 4> magnesium sulfite 5> magnesium hydrogen sulfite

Q: Indicate the type of bonding you would expect between the following elements. A) none B) polar covalent C) nonpolar covalent D) ionic 1> Na and F 2> N and F 3> F and F 4> He and F 5> H and F

Q: Give the correct charge for ions of the following elements. A) 1- B) 2- C) 1+ D) 0 E) 2+ F) 3+ 1> Ca 2> Cl 3> O 4> Al 5> K

Q: Match the correct name of the polyatomic ions with the formulas given. A) hydrogen sulfate B) nitrite C) hydroxide D) carbonate E) phosphite F) sulfate G) oxide H) hydrogen carbonate I) nitrate J) hydrogen sulfite K) phosphate L) carbonite M) sulfite 1> NO3- 2> CO32- 3> SO42- 4> SO32- 5> PO43- 6> NO2- 7> HCO3- 8> HSO4- 9> OH-

Q: Identify each of the following compounds as covalent or ionic. 1> nitrogen trichloride 2> carbon tetrachloride 3> potassium oxide 4> carbon dioxide 5> sodium fluoride 6> hydrogen sulfide 7> The weakest type of force between particles of a substance is termed ________. 8> Are hydrogen bonds stronger or weaker than covalent bonds? 9> Are dipole-dipole interactions weak or strong compared to ionic bonds? 10> What is the name of Na2S? 11> What is the name of FeCl3? 12> What is the name of SF6?

Q: Identify each of the following molecules as polar or nonpolar. 1> carbon tetrachloride 2> water 3> carbon dioxide 4> hydrogen sulfide 5> hydrogen fluoride 6> carbon monoxide

Q: The strongest interactions between atoms of helium He are examples of A) ionic bonds. B) covalent bonds. C) hydrogen bonds. D) dipole-dipole interactions. E) dispersion forces.

Q: The strongest interactions in the compound sodium fluoride, NaF, are examples of A) ionic bonds. B) covalent bonds. C) hydrogen bonds. D) dipole-dipole interactions. E) dispersion forces.

Q: The strongest interactions between molecules of iodine I2 are examples of A) ionic bonds. B) covalent bonds. C) hydrogen bonds. D) dipole-dipole interactions. E) dispersion forces.

Q: The strongest interactions between molecules of hydrogen chloride are A) ionic bonds. B) covalent bonds. C) hydrogen bonds. D) dipole-dipole interactions. E) dispersion forces.

Q: The strongest interactions between molecules of hydrogen ( H2) are A) ionic bonds. B) hydrogen bonds. C) polar covalent. D) dipole-dipole. E) dispersion forces.

Q: The strongest interactions between molecules of ammonia ( NH3) are A) ionic bonds. B) hydrogen bonds. C) polar covalent. D) dipole-dipole. E) dispersion forces.

Q: The ammonia molecule ( NH3) is A) a polar molecule with polar bonds. B) a nonpolar molecule with polar bonds. C) a nonpolar molecule with nonpolar bonds. D) a polar molecule with nonpolar bonds. E) a polar molecule with ionic bonds.

Q: The carbon tetrachloride molecule, CCl4, is A) a polar molecule with polar bonds. B) a nonpolar molecule with polar bonds. C) a nonpolar molecule with nonpolar bonds. D) a polar molecule with nonpolar bonds. E) a polar molecule with ionic bonds.

Q: Hydrogen sulfide, H2S, has a shape similar to A) carbon dioxide. B) carbon monoxide. C) hydrogen chloride. D) water. E) carbon tetrachloride.

Q: The carbon tetrachloride molecule, CCl4, has the shape of a A) tetrahedron. B) square. C) cube. D) circle. E) sphere.

Q: The shape of the water molecule ( H2O) is A) linear. B) tetrahedral. C) pyramidal. D) bent. E) octagonal.

Q: The shape of the carbon dioxide (CO2) is A) linear. B) square. C) pyramidal. D) hexagonal. E) bent.

Q: The shape of the ammonia molecule ( NH3) is A) linear. B) square. C) pyramidal. D) hexagonal. E) octagonal.

Q: The water molecule has a dipole with the negative portion A) localized between the hydrogen atoms. B) pointing toward the oxygen atom. C) localized on one of the hydrogens. D) pointing from the oxygen through the hydrogen atoms. E) surrounding the molecule.

Q: The shape of the carbon tetrachloride molecule is A) linear. B) square. C) pyramidal. D) tetrahedral. E) octagonal.

Q: The VSEPR theory allows us to determine the most favorable A) shape of a molecule. B) charge on an ion. C) color of a compound. D) bond type for a molecule. E) formula for a compound.

Q: The bond in Cl2 is a(n) A) ionic bond. B) nonpolar covalent bond. C) metallic bond. D) polar ionic bond. E) no bond.

Q: A polar covalent bond is found in which of these compounds? A) H2O B) F2 C) NaCl D) H2 E) N2

Q: Ionic bonding is expected in which of these compounds? A) Cl2 B) KF C) OF2 D) HF E) H2

Q: If the electronegativity difference between elements X and Y is 2.1, the bond between the elements X-Y is A) ionic. B) nonpolar ionic. C) nonpolar covalent. D) polar covalent. E) impossible.

Q: Which of the following compounds contains an ionic bond? A) NH3 B) H2O C) CaO D) H2 E) CH4

Q: Which of the following compounds contains a polar covalent bond? A) NaF B) HCl C) Br2 D) MgO E) O2

Q: Which of the following elements has the lowest electronegativity? A) Li B) C C) N D) O E) F

Q: Which of the following substances contains a nonpolar covalent bond? A) H2O B) NaCl C) NH3 D) MgF2 E) N2

Q: The ability of an atom to attract the shared electrons in a covalent bond is its A) electronegativity. B) bonding ability. C) polarity. D) ionic character. E) nonpolarity.

Q: How many valence electrons are in the electron-dot structure of CCl4? A) 0 B) 82 C) 6 D) 8 E) 32

Q: Choose the best electron-dot structure for CH2Cl2. A) B) C) D) E)

Q: Choose the best electron-dot structure for OCl2. A) B) C) D) E)

Q: How many lone pairs of electrons are in the electron-dot structure of H2O? A) 0 B) 1 C) 2 D) 3 E) 4

Q: How many valence electrons are in the electron-dot structure of H2O? A) 2 B) 4 C) 6 D) 8 E) 10

Q: Double and triple bonds form because A) the atoms involved have high electronegativities. B) single covalent bonds do not give all of the atoms in the molecule eight valence electrons. C) one of the atoms in the molecule has more than eight valence electrons. D) the ions involved have charges larger than one. E) there is at least one hydrogen atom involved in the bond.

Q: In a covalently bonded molecule, the number of electrons that an atom shares with others is usually equal to the number of electrons A) in the atom. B) in its nucleus. C) in all the atoms. D) in its ion. E) needed to give it a stable electron configuration.

Q: Which of the following elements does NOT exist as a diatomic molecule? A) hydrogen B) nitrogen C) chlorine D) oxygen E) carbon

Q: What is the formula of carbon tetraiodide? A) CI B) CI4 C) C4I D) CI3 E) C2I4

Q: The correct name for the compound N2O3 is A) nitrogen oxide. B) nitrogen trioxide. C) dinitride trioxide. D) dinitrogen oxide. E) dinitrogen trioxide.

Q: The types of compounds that use prefixes in their names are A) ionic compounds. B) ionic compounds involving transition metals. C) polyatomic ions. D) covalent compounds. E) compounds that contain polyatomic ions.

Q: The formula for a molecule formed from N and Cl would be A) NCl. B) NCl2. C) NCl3. D) N3Cl. E) NCl5.

Q: The correct name of the compound is A) nitrogen chloride. B) trinitrogen chloride. C) nitrogen(III) chloride. D) nickel chloride. E) nitrogen trichloride.

Q: In a molecule with covalent bonding A) oppositely charged ions are held together by strong electrical attractions. B) atoms of metals form bonds to atoms of nonmetals. C) atoms of different metals form bonds. D) atoms are held together by sharing electrons. E) atoms of noble gases are held together by attractions between oppositely charged ions.

Q: A(n) ________ is the smallest neutral unit of two or more atoms held together by a covalent bond. A) ionic compound B) nucleus C) molecule D) formula E) unit

Q: Which of the following polyatomic ions has a 3- ionic charge? A) hydroxide B) nitrate C) sulfate D) phosphate E) bicarbonate

Q: What is the formula for aluminum nitrite? A) Al2NO2 B) AlNO3 C) Al(NO2)3 D) Al2(NO3)3 E) Al2(NO2)2

Q: Fe2(SO4)3 is called A) iron sulfate. B) iron(II) sulfate. C) iron(III) sulfate. D) diiron trisulfate. E) iron trisulfate.

Q: What is the formula of a compound that contains Na+ and PO43- ions? A) Na3PO4 B) NaPO4 C) Na2PO3 D) Na3PO3 E) Na3P

Q: The name of the HSO4- ion is A) sulfate. B) hydrogen sulfate. C) sulfite. D) hydrogen sulfite. E) sulfide.

Q: Which of the following polyatomic ions has a positive charge? A) hydroxide B) sulfate C) hydrogen carbonate D) ammonium E) nitrate

Q: A group of covalently bonded atoms that has an overall electrical charge is called a(n) A) ionic compound. B) anion. C) polyatomic ion. D) cation. E) molecule.

Q: The formula of copper(I) sulfide is A) CuS. B) Cu2S. C) Cu2(SO4)3. D) CuSO4. E) CuS2.

Q: The name of PbO2is A) lead dioxide. B) lead(II) oxide. C) lead(IV) oxide. D) plumbum oxide. E) lead oxygen.

Q: The name of Al2(SO4)3 is A) aluminum(III) sulfate. B) dialuminum trisulfate. C) dialuminum sulfate. D) dialuminum trisulfide. E) aluminum sulfate.

Q: What is the correct formula for iron(III) sulfide? A) Fe2S2 B) Fe2S C) FeS D) FeS2 E) Fe2S3

Q: The name of the Cu+ ion is A) copper(II). B) copper(I). C) cobalt. D) copper. E) cuprum.

Q: What is the correct formula for the iron(II) ion? A) Fe+ B) Fe2+ C) Fe3+ D) Fe2- E) Fe3-

Q: Which one of the following elements forms two or more ions with different ionic charges? A) K B) F C) Ca D) O E) Fe

Q: The compound MgCl2is named A) magnesium chlorine. B) magnesium dichloride. C) magnesium(II) chloride. D) magnesium chloride. E) dimagnesium chloride.

Q: Which one of the following compounds contains an ion with a 3+ charge? A) KCl B) Na2O C) FeCl3 D) CuCl E) MgCl2

Q: The correct formula for the compound formed from Mg and S is A) MgS. B) MgS2. C) Mg2S. D) Mg2S2. E) Mg2S3.

Q: The correct formula for a compound formed from the elements Al and O is A) AlO. B) Al2O. C) Al3O2. D) AlO3. E) Al2O3.

Q: An ionic compound A) has a net positive charge. B) has a net negative charge. C) contains only cations. D) contains only anions. E) has a net charge of zero.

Q: How many electrons will iodine gain or lose when it forms an ion? A) lose 1 B) gain 5 C) lose 2 D) lose 3 E) gain 1

Q: How many electrons will lithium gain or lose when it forms an ion? A) lose 1 B) gain 5 C) lose 2 D) lose 3 E) gain 1

Q: What is the formula of the nitride ion? A) N3- B) NO2- C) NO33- D) NO32- E) NO3-

Q: What is the correct formula for the oxide ion? A) O2- B) O- C) O+ D) O2+ E) O3+

Q: How many electrons will chlorine gain or lose when it forms an ion? A) lose 1 B) gain 1 C) lose 7 D) gain 2 E) lose 3

Q: The ion of aluminum is A) Al+. B) Al2+. C) Al3+. D) Al3-. E) Al2-.