Chemical Reactions and Limiting Reactants - Test Test

Question 1

The equation shows the reaction between zinc metal and hydrochloric acid. Zn times s plus 2 HCl aq rightarrow ZnCl sub 2 times aq plus cap h sub 2 of g What is the theoretical yield of hydrogen gas if 5 point 0 0 mol of zinc are added to an excess of hydrochloric acid?

Revolt · Accepted Answer

A: 10 point 1 g

Question 2

What is the percent by mass of oxygen in carbon dioxide open paren cap c cap o sub 2 close paren ? Use percent Element is equal to total mass of element in compound over molar mass of compound times 100

Revolt · Accepted Answer

A: 72 point 7 1 percent

Question 3

The chemical equation for the formation of ammonia is unbalanced. 3 cap h sub 2 g plus cap n sub 2 times g rightarrow NH sub 3 times g If three molecules of hydrogen react with one molecule of nitrogen, how many molecules of ammonia would be formed?

Revolt · Accepted Answer

B: 2

Question 4

Which is the most important question for deciding if a chemical reaction has occurred?

Revolt · Accepted Answer

A: Was any heat energy given off?

Question 5

Which statement best characterizes chemical reactions?

Revolt · Accepted Answer

B: Their rates vary significantly.

Question 6

Which statement correctly describes the actual yield and the theoretical yield of a reaction?

Revolt · Accepted Answer

C: The actual yield depends on the reaction conditions, but the theoretical yield varies only with reactant amounts.

Question 7

Which products are formed when aluminum is added to a silver chloride solution? Use the activity series if needed. Al is greater than Mn comma Mn is greater than Zn comma Zn is greater than Cr comma Cr is greater than Fe comma Fe is greater than Cd comma Cd is greater than Co comma Co is greater than Ni comma Ni is greater than Sn comma Sn is greater than Pb comma Pb is greater than cap h comma cap h is greater than Sb comma Sb is greater than Bi comma Bi is greater than Cu comma Cu is greater than Ag comma Ag is greater than Pd comma Pd is greater than Hg comma Hg is greater than Pt

Revolt · Accepted Answer

B: AlCl sub 3  and  Ag; C: none

Question 8

What is the percent yield of ferrous sulfide if the actual yield is 220 point 0 g and the theoretical yield is 275 point 6 g ? Use percent Yield is equal to Actual yield over Theoretical yield times 100

Revolt · Accepted Answer

C: 79 point 8 percent

Question 9

When two substances are mixed together, a color change is observed. Does this mean that a chemical reaction has definitely occurred?

Revolt · Accepted Answer

A: No because some physical changes produce color changes.

Question 10

Which characteristic best identifies a decomposition reaction?

Revolt · Accepted Answer

C: a single compound as a reactant

Chemical Reactions and Limiting Reactants - Test Test Answers

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