1) In a homopolar covalent bond the bond difference between the bonding atoms is a) 0 and 0,4 b) 0,4 and 1,9 c) greater than 1.9 d) none of the answers are correct 2) Chemical elements were classified within the periodic table by the chemist a) Thompson b) Mendeleev c) Rutherford d) Bohr 3) A solution containing 180 g of glucose (180 g/mol) has a molarity of a) 2 M b) 0,6 M c) 1 M d) 0,5 M 4) in calculating the molality of a solution the mass of the solvent is expressed in a) grams b) liters c) milliliters d) kilograms 5) A solution has 30 ml of propanol dissolved in 90 ml of distilled water. Calculate the v/v ratio of the solution a) 20% b) 25% c) 30% d) 35% 6) Hund's rule of maximum multiplicity states that a) To minimize repulsion, the electron preferably occupies an empty orbital before pairing with another electron b) two electrons occupying the same orbital must have opposite spins c) Each electron always occupies the lowest energy atomic orbital possible d) none of the answers are correct 7) The atomic radius has the following periodic properties a) decreases going down a group and decreases going from left to right across a period. b) It does not exhibit any periodic properties c) increases from top to bottom in the group and remains constant over the period d) It increases going down a group and decreases going from left to right across a period. 8) The reaction Ca + HCl --> CaCl2 + H2 is a a) double exchange reaction b) reaction decomposition c) simple exchange reaction d) synthesis reaction 9) the law of mass action states that a) In a chemical system the ratio of the product of the molar concentrations of the products and the product of the molar concentrations of the reactants is constant at a given temperature. b) In a chemical system the ratio of the product of the molar concentrations of the products and the product of the molar concentrations of the reactants is not constant at a given temperature. c) in a chemical system the ratio of the product of the molar concentrations of the products and the product of the molar concentrations of the reactants does not depend on the temperature d) none of the answers are correct 10) A high value of Keq of a reaction at equilibrium a) indicates that it is shifted towards the reactants b) indicates that the reaction is shifted towards the products c) It does not provide any indication d) the concentration of the reactants is equal to that of the products

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