Chem 1360 1st EditionExam # 3 Study GuideChapter 4 -The structured difference between a sodium atom and a sodium ion is that the sodium ion has one less electron that the sodium atom-K and Ar are isoelectronic; 8A is characterized by a stable electron arrangement-2 dots surround Be in the Lewis symbol for beryllium; 7 dots surround F in the Lewis symbol forfluorine-a potassium ion and an argon atom have the same electron configuration-8 dots are shown on the Lewis symbol for chloride ion, and has a negative charge-the bonding between K ions and F ions in potassium fluoride is ionic-K and S would most likely form an ionic compound-Sulfur forms a simple ion with a charge of 2--magnesium forms a simple ion with a charge of 2+-the formula for the binary ionic compound of barium and sulfur is BaS-the correct name for KCL is potassium ; the correct name is Al2S3 is aluminum sulfide-the correct name for Lil is lithium iodide; the correct name for ZnCl2 is zinc chloride-a bond formed when two atoms share a pair of electrons is covalent-the bond in Br2 is single covalent; the bond in N2 is triple covalent-the formula for phosphorus trichloride is PCl3; the formula for disulfur difluoride is S2F2-the correct name for N2S4 is dinitrogen tetrasulfide; the correct name is L2O5 is diiodine pentoxide-when HCL is formed a pair of valence electrons is shared, one each from the H atom and the Cl atom- H-H bond is the least polar; C-F is the most polar-in a polar covalent bond, the atom with greater electronegativity bears a partial negative charge-for an ionic bond to exist between two atoms, their difference in electronegativity should be greater than 2.0-to gain an octet of electrons in forming methane, a carbon atom must share an electron with each of 4 H atoms-the correct name for NH4HCO3 is ammonium hydrogen carbonate -the formula for calcium nitrate is CA(No3)2-the formula for copper hydrogen sulfate is CuHSO4 Chapter 5 -the mass of 1 mol of carbon-12 atoms is 12 grams-the mass of 4.75 mol H2SO4 is 466 grams-Si would be a 10.0-g sample contain the most moles-10.3 moles of CO2 are there in 1 lb CO2-.500 moles of water can be formed from .500 mol H2-in a solution of 85.0 grams of water and 5.0 grams of sucrose, the solute is sucrose and the solvent is water-20% of ethanol in a solution made by adding 50.0 mL of pure ethanol to enough water to make 250 mL of solution-a solution contains 15 g sucrose and 60.0 g of water. The percentage by mass of sucrose in the solution is 20%-250mL of volume of 6.00 MHCL solution contains 1.50 HCLChapter 6-Molecules are farthest apart in a gas-liquids are difficult to compress and have no definite shape-when a liquid changes into a gas, the process is called vaporizatoin-when a liquid changes into a solid, the process is called freezing-when a solid changes directly into a gas, the process is called sublimination-The molecules of liquid water in a beaker are held to each other by intermolecular bonds-covalent bonds are the strongest-the molar volume of an ideal gas at 2.00 atm and 546 K is 22.4 L-the variable n stands for the number of moles-gas pressure is caused by gas molecules colliding with vessel walls-Boyle’s law states that the pressure of a gas is proportional to its volume-when the temperature is changed at constant pressure, the volume of a gas is halved, the kelvin temperature is halved-.250 mL moles are there in 5.60 L of a gas at STP-in collisions between gas particles, the total energy remains the same-a gas particle is tiny compared to the volume occupied by the gas-a solution is a mixture that is homogeneous -an ionic compound in a nonpolar solvent is least likely to form a