Unit 4 Review

An antacid tablet containing Mg(OH)2(s) (molar mass 58.3 g/mol) is titrated with a 0.100 M solution of HNO3(aq). The end point is determined by using an indicator. Based on the data in the table above, what was the mass of the Mg(OH)2(s) in the antacid tablet?

0.0583 g

If 0.40 mol of H2 and 0.15 mol of O2 were to react as completely as possible to produce H2O, what mass of reactant would remain Responses

0.20 g of H2

A 2 L container will hold about 4 g of which of the following gases at 0°C and 1 atm? Responses

CO2

The reaction between solid copper and aqueous silver nitrate produces solid silver and a blue solution, as represented by the balanced equation shown above. Based on the balanced equation, which of the following identifies the oxidation and reduction half-reactions? Responses

CU(s) Cu 2+ (aq) + 2 e- Reduction half reaction Ag+ (aq) + e- Ag (s)

Which of the following describes the changes in forces of attraction that occur as H2O changes phase from a liquid to a vapor? Responses

Hydrogen bonds between H2O molecules are broken.

A 0.50 g sample of Mg(s) was placed in a solution of HCl(aq), where it reacted completely. Which of the following equations best represents the reacting species in the reaction described above?

Mg(s) + 2H+(aq) →Mg2+(aq) + H2(g)

Which of the following is the conjugate acid of NH2-? Responses

NH3

Which of the following represents a process in which a species is reduced?

NO3-(aq)→NO(g)

The exothermic process represented above is best classified as a Responses

chemical change because covalent bonds are broken and new covalent bonds are formed