Chapter 8

Consider the reaction: 2 Al + 3Br2 → 2 AlBr3 Suppose a reaction vessel initially contains 5.0 mole Al and 6.0 mole Br2. What is in the reaction vessel once the reaction has occurred to the fullest extent possible?

1.0 mole Al; 0 mole Br2; 4.0 mole AlBr3

How many moles of calcium chloride are theoretically produced for the following reaction given we have 2.6 moles of HCl and 1.4 moles of Ca(OH)2? Reaction: 2HCl + Ca(OH)2 → 2H2O + CaCl2

1.3

How many waffles can be made from 1 dozen eggs, assuming you have enough of all other ingredients? Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles

16

Diatomic N2 can react with diatomic H2 to form ammonia (NH3). The balanced chemical equation is: If 6 moles of H2 totally reacted with more than enough N2, how many moles of ammonia would be expected to form?

4 moles

Diatomic O2 can react with the element magnesium to form magnesium oxide (MgO). The balanced chemical equation is: If 4 moles of magnesium totally reacted with more than enough O2, how many moles of MgO would be expected to form?

4 moles

The theoretical yield of a reaction is 75.0 grams of product and the actual yield is 42.0g. What is the percent yield?

56.0

What is the excess reactant for the following reaction given we have 3.4 moles of Ca(NO3)2 and 2.4 moles of Li3PO4? Reaction: 3Ca(NO3)2 + 2Li3PO4 → 6LiNO3 + Ca3(PO4)2

Ca(NO3)2

Which of the below statements about global warming is FALSE? A) Some greenhouses gases are needed to keep the proper temperature balance. B) Greenhouse gases prevent heat from leaving the earth. C) Greenhouse gases allow sunlight to reach and heat the earth. D) If the level of greenhouse gases increases, the temperature will decrease. E) none of the above

If the level of greenhouse gases increases, the temperature will decrease.

Which of the following statements is false?

The theoretical yield is the amount of product that can be made based on the amount of limiting reagent. The limiting reactant is completely consumed in a chemical reaction. The percent yield = × 100%. The actual yield is the amount of product actually produced by a chemical reaction. * All of the above are true statements.

In order to determine the limiting reactant in a particular reaction, one must know each of the following EXCEPT:

the mass of each product formed.