1. Zn + 2HCl --> ZnCl 2 + H 2 Consider the reaction between 0.1 mol Zn and and 0

Question

1.   Zn + 2HCl --> ZnCl2 + H2       Consider the reaction between 0.1 mol Zn and and 0.1 mol HCl and choose the correct statement below.

a. no zinc solid remains at the end of the reaction

b. 0.05 mol ZnCl2 is formed

c. 0.05 mol HCl remains at the end of the reaction

d. both reactants are consumed completely in the reaction

e. 0.01 mol ZnCl2 is formed

2. Sodium metal reacts violently with water to form sodium hydroxide and hydrogen gas. How much hydrogen gas can form if 6 mol Na (s) and 8 mol H2O react?

3. Which of the folllowing atoms are likely to form compounds with MCl2 (M = cation)? Ca, Al, K, or Zn

Explanation / Answer

1)

mol of Zn = 0.1

mol of HCl = 0.1

then 0.5 mol of Zn react with 0.1 mol ofHCl

0.05 mol of Zn is left and 0.05 mol of ZnCl2 are produced

answer is B

2)

2 NA(s) + 2 H2O(l) = 2 NAOH(aq) + H2(g)

then 6 mol and 8 mol react

only 6 mol of H2O react

ratio is 2:1 therefore 6 mol of Na reacts to form 3 mol of H2

3)

For Cl2 this means M+2 is charged as that

that is typical of the Group II elements

Ca+2 is normally there to form CaCl2

but also Zn may form Zn+2 to form ZnCl2

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