Introduction to Stoichiometry

Question 1

Did you read the Student Guide carefully?

Revolt · Accepted Answer

yes

Question 2

If CuCl2 is the limiting reactant, of the aluminum will still be visible.

Revolt · Accepted Answer

some

Question 3

If aluminum is the limiting reactant, of it will still be visible after the reaction completes.

Revolt · Accepted Answer

none

Question 4

Why might the amount of copper produced be less than 100% of the expected amount? Check all possible reasons.

Revolt · Accepted Answer

There are impurities in the substances.; The reaction might not go to completion.; The amount of one of the reactants might be measured incorrectly.; The expected amount might be based on measurements with error.

Question 5

How can you improve the percent yield of copper in this lab? Check all possible strategies that will help you do so.

Revolt · Accepted Answer

Measure reactants precisely.; Stir to help the reaction take place.; Wait patiently until the reaction completes.; Make sure to recover as much copper as possible.

Question 6

The reason a filter system is used in thisexperiment is to separate and collect in the reaction.

Revolt · Accepted Answer

the solid copper

Question 7

One of the product chemicals is aluminum chloride, which is an eye and skin irritant that can cause chemical burns. What will prevent you from coming into contact with this hazard? Check all that apply.

Revolt · Accepted Answer

chemical-resistant gloves; a lab coat; safety glasses

Question 8

Put the list in chronological order (1–5). Allow the solid/liquid mixture to drain through the filter.

Revolt · Accepted Answer

3

Question 9

Use water to rinse the filter paper containing the mixture.

Revolt · Accepted Answer

4

Question 10

Place the filter paper in the funnel, then place the funnel in the Erlenmeyer flask.

Revolt · Accepted Answer

2

Introduction to Stoichiometry Answers

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