Chemistry 103 General Chemistry Practice Questions Final Exam 2025

Which nitrogen - containing compound is one cause of acid rain? - -NO2 How many moles of gas would be found in a rigid 5.0L cylinder at 12.0 atm pressure and 15 degrees C - -2.5 mol Which is the IUPAC name for Cu2SO3? - -copper (I) sulfite NH3, H2S, NO2, and Cl2 each has a distinct odor. If you were standing one meter away when bottles of each of these gases were opened simultaneously, which gas would you smell first? - -NH3 Which statement best describes the change phase of a gas to a liquid? - -It is exothermic because energy is released Which is the volume of 7.50 mol argon, Ar, at STP? - -168 Liters Which can be used to most accurately measure the volume of a liquid? - -graduated cylinder If the atmospheric pressure is 99kPa and the water vapor pressure is 3.0 kPa, then what is the pressure of the gas collected over water? - -96 kPa Express the measurement of 3750 meters in correct scientific notation. - -3.75 x 10 raised to the third (3) meters What is produced when zinc, Zn(s), reacts with dilute sulfuric acid, H2SO4(aq) - H2+ZnSO4 Which sample of gas at STP has the same number of molecules as 2.0 L neon, Ne, at STP. - -2.0 L of fluorine, F2 Lysine has a molecular formula of NH2 (CH2)4 CHNH2 COOH. What is the empirical formula for lysine. - -C6,H14,O2,N2 The melting point of gallium is 29.8 degrees C. What is the physical state of gallium at 250K? - -solid ________ H3PO4+_______ Ca(OH)2 ---- Ca3(PO4)2 + ? H20. Which is the coefficient of water, H20, in this equation when it is balanced using the whole number coefficients? - -6 Chemistry Chemistry A compound made of nitrogen and oxygen has a 30.4% nitrogen content by mass. What is its empirical formula? - -N2O4 What is the average atomic mass of this element with the given isotope abundance? - 42.65 u Al2 (CO3)3 (s) +6HCl (aq) ------ 2AlCl3 (aq) + 3H20 (l) + 3CO2(g). What volume of carbon dixode gas, CO2, would be produced at STP if 23.40 g of aluminum carbonate reacts with excess hydrochloric acid, HCl? - -6.72 L Ten grams of a certain isotope has a half life of 12 hours. What mass of this isotope remains after 48 hours? - -0.63 g K2CO3(s) + 2HCl (aq) ----- 2KCl (aq) + H20 (l) + CO2 (g). What mass of potassium chloride should be theoretically produced when 41.46 g of potassium carbonate is reacted with excess hydrochloric acid? Compunds: Potassium Chloride, KCl = 74.55 molar mass, g * mol -1 Potassium Carbonate, K2CO3 = 138.2 g * mol -1 - -44.73 g Which atom has the smallest radius? - -P For an atom, which set is correct? - -Ca, 20 protons, 20 electrons Which is the specific heat of lead, Pb, if the addition of 3350 J changes the temperature of 516 g from 20.8 degrees C to 70.8 degrees C? - -67.0 J * g-1 degrees C -1 Consider this reaction N2(g) + O2 (g) ------ 2NO (g) ---- delta (heat) = +180.50 kJ. What will the enthalpy change be if 15.00 g of NO forms? Compound: nitrogen oxide, NO = molar mass, g * mole -1 - -+45.1 KJ A crystalline solid, which is a nonconductor in its solid state, has a high melting point, and is water soluble, is classified as? - -Ionic What is the equilibrium constant expression for this reaction? C(s)+O2(g) = 2 CO2(g) - k (eq) = [O2]/ [CO2]2 In which set do all the elements have the same number of valance electrons? - -N,P, As Which combination of elements would be expected to produce the most polar covalent bond? - -O-H A catalyst effectively increases the rate of reaction by decreasing the ____ - -activation energy Chemistry Chemistry Which molecule has two unshared pairs of electrons on the central atom? - -H2S Which formula represents an alkene? - -C3H6 Which mass of solute is required to prepare 500. mL of 0.200 M calcium chloride, CaCl2? Compound: calcium chloride, CaCl2 = 111 molar mass g *mol -1 - -11.1 g What is the [H30+] of a solution whose pH is 3.32? - -4.79 * 10 to the negative 4 M An aqueous solution contains hydronium ion, H30+, at a concentration of 2.4 * 10 to the negative 6 M. What is the hydroxide ion, OH-, concentration in this solution? K(w) = 1.0 * 10 to the negative 14th? - -4.2 * 10 to the negative 9th M Which is a property common to acids such as HCl (aq) or H2sO4 (aq)? - -They react with zinc to produce hydrogen gas What is the solubility if KNO3 in 100g of water at 50 degrees C - -80 g Which of these acids is the strongest? Acetic --- CH3COOH --- 1.8 * 10 to the negative 5 formic ---- HCOOH ----- 1.8 * 10 to the negative 4 hydrosulfuric ---- H2S ---- 1.0 * 10 the negative 7 phosphoric ----- H3PO4---- 3.7 * 10 to the negative 2 - -phosphoric Given: N2(g)+3H2(g) = 2NH3(g) -------- K (eq) = 1.3 * 10 to the negative 2. At equilibrium, the concentrations of nitrogen and hydrogen are both 0.10 mol*L(-1). What is the ammonia concentration? - -0.0011 mol * l (-1) Which description of HNO3 (aq) is correct in this chemical equation? 3S(s) + 4HNO3 (aq) ----- 3SO2(g)+4NO(g)+2H2O (l) - -It is oxidized and is the reducing agent What is the oxidation number of sulfur in sodium thiosulfate, Na2S2O3? - -+2 In an oxidation-reduction reaction Mn04- becomes Mn2+. How many electrons must be transferred by manganese, Mn? - -5 elections gained Which compound's name has its correct formula? - -copper (II) acetate, Cu(C2H3O2)2 Which procedure should be followed when mixing a concentrated acid and water? - add acid to the water Convert 52 045 mm to km - -0.052 045 km which is the mass of one mole of (NH4)2 CO3? - -96 g Chemistry Chemistry In addition to a balance, which piece of glassware is best used to determine the density of zinc by displacement? - -graduated cylinder Which compound is baking soda? - -NaHCO3 Which is an example of a chemical change? - -melting wax How many atoms of carbon, C, are in a 0.200 g diamond? - -1.00 * 10 to the 22 power These two gas samples, at the conditions sh