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chemistry 20 MC questions

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1- The equipment needed to carry out a titration is:

A)
hot plate, pipet, and filter paper
B)
heat source, test tube, and filter paper
C)
heat source, pipet, and burette
D)
erlenmeyer flask, pipet, and burette

2- A student correctly predicted that 10.0 g of a precipitate would form when two aqueous solutions were reacted. When the solid was filtered and weighed, only 8.0 g of solid had been collected. A cause for the discrepancy is that
Question 12 options:

A)
the student forgot to subtract the mass of the filter paper
B)
some precipitate went through the filter paper or funnel
C)
the sample was still wet when weighed
D)
the student did the reaction at STP instead of SATP

  • chemistry 20 MC questions - ,

    1 is D.
    I don't know what you did for #2.

  • chemistry 20 MC questions - ,

    Thanks Dr. Bob
    for #D this is the question given, there is no lab given!

  • chemistry 20 MC questions - ,

    Some educated guesses.
    It can't be C as extra H2O when weighed would make the apparent weight more than 8.0 g.
    B is a good possibility.
    I doubt D since this was not a gas experiment.
    A. It isn't clear how the mass of the filter paper figures into the mass of the ppt and since B looks like a good answer I would go with B.

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