Question

1. Balance each equation:

a) H2 +I2 = HI b) Al+O2 = Al2O3 d) Al+HBr = Albr3+H2

2. Calcium oxide is prepared by heating limestone (calcium carbonate, CaCO3) to a high temperature, at point it decomposes to calcium oxide and carbon dioxide. Write a balanced equation for this preparation of calcium oxide.

3.When a piece of aluminum metal is dropped into hydrochloric acid, HCI, hydrocloric acid, HCI, hydrogen is released as a gas and a solution of aluminum chloride forms. Write a balanced equation for the reaction.

4. In the equation: 2Na^+(aq)+CO3^2-(aq)+Sr^2+(aq)+2CI^-(aq)+SrCO3(s)+2Na^+(aq)+2CI^-(aq)

a) Identify the spectator ions b) Write the balaanced net ionic equation

5. When a solution of sodium hyroxide is added to a solution of ammonium carbonate, H2O is formed and ammonia gas, NH3, is released whe the solution is heated. Write a net ionic equation for this reaction. Both NaOH and (NH4)2CO3 exist as dissociated ions in aqueous solution.

6. Using the solubility generalizations given in Section 4-3 predict which of these ionic compounds are soluble in water.

a)MgCl2 b)CaCO3 c)Na2SO3 d)NH4NO3 e)Pb(OH)2

7. When a piece of sodium metal is added to water, hydrogen is evolvedas a gas . and a solution of sodium hydroxide is formed.

a) Write a balanced equation for this reaction.

b) What is oxidized in this reaction? What is reduced?

8. Calculate the formula weight of:

a)Na3PO4 b)Al2(SO4)3

9. Calculate the number of moles in:

a) 32g of methane,CH4 b)184.4g of chlorine dioxide ClO2

10. Calculate the number of grams in:

a) 1.77 mol of nitrogen dioxide, NO2 b) 3.69 mol of uranium hexaflouride, UF6