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In the Experiment PDF for Buffer Solutions, the procedure for testing the six solutions says that once a solution changes pH by more than 0.5 units after an addition, the solution can be discarded. However, the report submission requires pH values...

I have used the Buffer Solutions experiment three terms now, and each term, at least one of the solutions gets all the way to 25 drops of added HCl or NaOH (or both) without the pH ever changing by more than 0.5 units after each addition. In pract...

The first question for part A asks students to generalize the properties for metals, metalloids, and nonmetals from OBSERVATIONS of the given samples. If they are only given metals, how are supposed to generalize from observations the properties o...

I want to be able to grade student lab reports without them being able to see the points they're getting BEFORE I post the grade. I want to get ahead on grading, but I'm afraid that those I grade early will share their results with students who ha...

why only a once submitting ??

I wanted to know if it's possible to do a grade update in an inactive course, please.

I have to individually grade each of the picture submissions for a lab and the way each photo fits onto the screen which is so zoomed in that it is pointless to scroll around to look at the answer. When I click on an individual photo to zoom in, i...

I have done isolation of caffeine from tea leaves for more than 15 labs. We don't recrystallize it nor measure its melting point. We do sublimation with a hot plate, crude sample in a petri dish. We place several wet paper towels and a buckle of i...

In the Chemistry Glassware Techniques and Measurement experiment you forgot to include the temperature and corresponding density of the water in the provsional data. Then students can calculate percent error between the burette and graduated cylin...