Chem 1010 - Chapter 6 with complete verified solutions(GUARANTEED SUCCESS).

Which of the following compounds has polar covalent bonds? (H2O, CsF2, S8, Ne) H20 How many valence electrons does bromine (Br, atomic no. = 35) have? 7 Brainpower Read More Which should be larger, the potassium atom, K, or the potassium ion, K⁺? The potassium atom, K, with an additional shell of electrons is larger. Which of the following elements will most likely not form an ion at all? (Na, O , Ar, Mg) Ar Which covalent bond is more polar: a sulfur-bromine (S-Br) bond or a selenium-chlorine (Se-Cl) bond? A selenium-chlorine bond should be more polar because of a greater difference in effective nuclear charge. Atoms of nonmetallic elements form covalent bonds, but they can also form ionic bonds. How is this possible? An ionic bond results when a nonmetallic elements gains electrons to form an ion. Which of the following compounds would be ionic? (CS2, CF4, SO2, CaCl2, SF5) CaCl2 Take enough money away from your bank account and the bank will show a negative credit. Take an electron away from an atom, however, and the atom shows up positive. Explain. Neutral atoms contain identically charged but oppositely signed protons and electrons. Removing one of the negative electrons results in an excess of positively charged protons. When is the electronic geometry of a molecule not the same as its molecular shape? when one or more of the substituents is a lone pair of electrons An individual carbon-oxygen bond is polar. Yet carbon dioxide is nonpolar because ________. (A) the molecule has an even number of electrons (B) it's symmetry (C) the electron-pulls of the two oxygen atoms are equal and opposite B and C Which of the following molecules is the most polar? (HF, HCl, CO) HF The number of nonbonding (lone) electron pairs in the water molecule is ________. 2 Phosphine is a covalent compound that contains phosphorus, P, and hydrogen, H. What is its chemical formula? PH3 Which of the following has the greatest number of nonbonding pairs of electrons? (C, H, He, F) F Classify the following bonds as ionic, covalent, or neither - O with F; Ca with Cl; Na with Na covalent, ionic, neither If the concentration of gold in seawater is 2.0 milligram per ton of sea water and the mass of the ocean is 1.5 × 1018 tons, how much gold is in the ocean? 3.0 × 1012 kg Which of the following elements has six valence electrons? (Be, B, C, O) O True or False: The more shells in an atom, the lower its electronegativity. Explain. Sometimes true and sometimes false; This holds true only within any one atomic group (vertical column). Which bond is most polar? (H-N, N-C, C-C, O-H) O-H Calcium fluoride, CaF2, is an example of ________. (ionic, metallic, covalent compound, polar covalent compound) an ionic compound Which of the following molecules contains an ionic bond? (MgCl2, Cl2, SF3, Cl2O7) MgCl2 Which would you expect to have a higher melting point: sodium chloride, NaCl, or cesium chloride, CsCl? Why? The sodium chloride has a higher melting point because its ions are smaller, which allows oppositely charged ions to get closer. Ammonia is more polar than is borane because it ________. has a lone pair of electrons is less symmetrical than borane its hydrogens are not exactly opposite one another all of the above Which of the following elements will most likely form an ion with a -2 charge? (Na, S, Ne, Mg) S Which of the following molecules would contain a dipole? (H-F, Cl-Cl, H-H, F-F) H-F The number of nonbonding (lone) electron pairs in the ammonia molecule is ________. 1 Germanium chloride has only two atoms surrounding the central germanium atom. Why then is the germanium chloride molecule bent? A lone pair of electrons on germanium pushes it to this orientation. Is an ionic compound an example of a chemical compound, or is a chemical compound an example of an ionic compound? An ionic compound is an example of a chemical compound. How many substituents are on the carbon atom in CH4? 4 If you mix a typical iodine ion (I, atomic no. = 53) with a typical barium ion (Ba, atomic no. = 56), what compound is formed? BaI2 How many nonbonding pairs of electrons are in the following molecule? H—H o pairs Which of the following would be an ion with a double positive charge? an Mg atom that loses two electrons