1) A molecule, whose formula is AB, dissolves in water and also conducts electri

Question

1) A molecule, whose formula is AB, dissolves in water and also conducts electricity. What one statement best describes this molecule after it's placed in water? A)AB exists as a molecule only. B)AB exists as precipitate only C) The attraction between A and water is weaker than the attraction between A and B. D) AB is an electrolyte. E) Both c and d. 2) Which one of the following is a weak electrolyte. A) Na2SO4(s) B) HClO4(aq) C) NH3(aq) D) NaOH(aq) E) NaC2H3O2(aq) 3)Which statement describes the net ionic equation obtained between NaCl(aq) and KBr(aq) ? A) The net equation is Na+(aq)+ Br+(aq)= NaBr(s) B) All spectator ions cancel out, therefore there is no reaction. C) All spectator ions cancel out, therefore there is a reaction. D) The net ionic equation is K+(aq)+Cl-(aq)= KCl(s) E) None of the above. 4) What is the oxidation number of Cl in the compound NaClO4? A)+1 B)+7 C)+3 D)+4 E)0 5)Which statement is true in regards to a half reaction in which reduction occurs? A)An electron is a product. B) An electron is a reactant. C) An electron is both a reactant and a product. D) Oxidation also occurs. E) None of the above. 6) What statement best describes gravimetric analysis? A) An oxidation reduction usually occurs. B) A precipitation reaction usually occurs, and the results are not as accurate as volumetric analysis. C)Though multiple reactions are required, an indicator immediately shows when the reaction is completed. D) A precipitation reaction usually occurs, and the results are more accurate than volumetric analysis. 7)What wil never react with water? A) NH3 B) an Acid C) a salt D) a weak electrolyte E) another water molecule 8) By convention, standard temperature and standard pressure is , A) 0 K and 760 atm B)0 C and 1 atm. C) 298 K and 1 atm. D) 25 C and 1 atm. E) none of the above. 9) All the following are postulates of the kinetic molecular theory of gases except A) the collisions between molecules are elastic. B) the gas molecules move randomly in straight lines in all directions. C) smaller gas molecules will travel at the same speed as larger gas molecules. D) volume of the molecules are neglible compared to the volume of the container. E) none of the above. 10) Effusion describes, A) the process by which a gas spreads out through another gas B) the process that describes the collisiions that occur between gas molecules. C) the process in which a gas flows through a small hole in a container. D) the melting of ice. E) objectively proving that a theory is false. 11) When comparing the rates of effusion of NOF(g) to that of HBr at the same temperature and pressure, the gas with the highest rate would be. A) NOF (G) B) Hbr (g) C) both D) neither E) The relative rates cannot be determined, since the actual temperature would have to be given. 12) True or False " Boyle's Law states that the volume and temperature of a gas are directly proportional to one another at constant pressure.

Explanation / Answer

B)AB exists as precipitate only

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