Chemistry Final Exam Review

Atomic Structure 1) Find the number of protons, neutrons, and electrons: a) Se-80 b) 136Ba2+ 2) Identify the neutral atom that contains 10 electrons and 11 neutrons. 3) Neutral atoms of the same element can differ in their number of __________. They are called __________. What wavelength of light is released when electron moves from n=5 to n=3? The half-life of Zn-71 is 2.4 minutes. If one had 100.0 g at the beginning, how many grams would be left after 7.2 minutes has elapsed?

Periodic Table Which is larger? C or N Cl or Br Which is larger? Ca+2 or Ca Which is smaller? Br-1 or K+1 Which element has the greatest electronegativity? Be, B, C, or Ne? Which element has the greatest ionization energy? N, O, or F Write the electron configurations, orbital notation, and noble gas for : C As Ne

Bonding and Nomenclature Draw the following molecules, name the shape, identify as polar or nonpolar CH4 NH3 PF3 SiO2 Name or write the formula for the following: NaCl barium hydroxide lead (II) oxide tin (IV) bromide

Chemical Reactions Write the products, balance… HCl + Ba(OH)2 → C6H14 + O2 → NaCl + Ca → Cr + KBr → Write the ionic and net ionic equation: Ca(OH)2 + Na2SO4 →

Stoichiometry The compound ethylene glycol is often used as an antifreeze. It contains 38.7% carbon, 9.75% hydrogen, and the rest oxygen. The molecular weight of ethylene glycol is 62.07 g. What is the molecular formula of ethylene glycol?

Gas Laws A sample of nitrogen gas has a volume of 478 mL and a pressure of 104.1 kPa. What volume would the gas occupy at 88.2 kPa if the temperature remains constant? A sample of gas has a volume of 215 mL at 23.5 °C and 84.6 kPa. What volume will the gas occupy at STP? What is the pressure in atm exerted by 2.48 moles of a gas in a 250.0 mL container at 58°C? Blast furnaces give off many unpleasant and unhealthy gases. If the total air pressure is 0.99 atm, the partial pressure of carbon dioxide is 0.05 atm, and the partial pressure of hydrogen sulfide is 0.02 atm, what is the partial pressure of the remaining air?

Thermochemistry 1) In endothermic reactions, heat is absorbed or released? 2) Endothermic reactions feel hot or cold? 3) Endothermic or Exothermic? a) Water freezing b) Candle Burning c) Water boiling 4) How much energy is lost when 2 grams of water at 20°C freezes? 5) What is the final temperature of 10 grams of water that starts at 110°C and releases 50 joules of energy. 6) Is entropy increasing or decreasing when water freezes? When a solid dissolves? 7) What is the specific heat of aluminum if the temperature of a 28.4 g sample of aluminum is increased by 8.1 oC when 207 J of heat is added?

Solutions Predict the effect of decreasing the temperature on the position of the following equilibria. (a) H2(g) + Cl2(g) ↔ 2HCl(g) + 49.7 kJ (b) 2NH3(g) ↔ N2(g) + 3H2(g) ∆ H = 37.2 kJ (c) CO(g) + H2O(g) ↔ CO2(g) + H2(g) ∆ H =-27.6 kJ Write the equilibrium expression for the following: SiO2(s) + 4HF(g) ↔ SiF4(g) + 2H2O(g)

Acids and Bases Name or write the formula for the following: HCl H2SO3 HNO3 hydrosulfuric acid nitrous acid carbonic acid Calculate the pH, pOH, [H], and [OH] for the following: a.)0.5M HCl b.) pH of NaOH = 4 c.) pOH of HBr = 10 d.) 0.6 M Sr(OH)2

IMF Van der Waals Hydrogen bonding Dipole-Dipole