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Measuring Reaction Rates

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Questions and Answers

Which solution is produced when sodium thiosulfate and hydrochloric acid react?

A yellow cloudy solution

An insoluble precipitate of sulfur (correct)

A clear and colorless solution

A diluted solution

What is the purpose of the cross drawn on a piece of paper?

To mix the sodium thiosulfate and hydrochloric acid

To measure the rate of the chemical reaction

To observe when the cloudy yellow color gets too thick (correct)

To dilute the sodium thiosulfate

What is the role of the concentration of sodium thiosulfate in the experiment?

To determine the time it takes for the precipitate to form (correct)

To measure the rate of the chemical reaction

To produce an insoluble precipitate of sulfur

To dilute the hydrochloric acid

What happens to the solution when the precipitate of sulfur is formed?

It changes from clear and colorless to a yellow cloudy color Signup and view all the answers

How much sodium thiosulfate is mixed with hydrochloric acid in the experiment?

50 centimeters cubed Signup and view all the answers

During the reaction, the solution changes from clear and colorless to a ______ cloudy color.

yellow Signup and view all the answers

The rate of the chemical reaction is measured by timing how long it takes for the ______ yellow color to get so thick that it can't be observed.

cloudy Signup and view all the answers

To measure the rate of the reaction, a _____ is drawn on a piece of paper and placed underneath the reaction vessel.

cross Signup and view all the answers

The concentration of ________ is varied in the experiment to observe its effect on the time it takes for the precipitate to form.

sodium thiosulfate Signup and view all the answers

The sodium thiosulfate is mixed with _______ in the experiment.

hydrochloric acid Signup and view all the answers