Pre-Lab Questions: Mendeleev For a day

Mendeleev’s periodic table differs from the modern periodic table in the way elements are arranged.

Mendeleev left blank spaces on his periodic table because:

What is meant by the term precipitate? How will you detect a precipitate?

Nitric acid, HNO₃, will be used in the laboratory investigation when:

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It is necessary to mix any solution that does not show an immediate change because:

• the reaction may still be occurring and mixing ensures uniformity

• it will change color instantly if mixed

• mixing will stop the reaction completely

• the solution will evaporate if not mixed

It is necessary to rinse the well plate thoroughly because:

• it removes any residual chemicals that could interfere with the experiment.

• it makes the plate look clean for the next user.

• it helps the plate dry faster.

• it prevents the plate from breaking.

The number of unknown solutions you will be testing is:

• 5

• 8

• 2

• 9

The number of test solutions you will be using is:

• Two: Solution A and Solution B

• One: Solution A only

• Three: Solution A, Solution B, and Solution C

• Four: Solution A, Solution B, Solution C, and Solution D

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All chemicals in this laboratory investigation should be handled:

• with care and according to safety guidelines.

• without any precautions.

• only if they look dangerous.

• by tasting them first.

The purpose of this laboratory investigation is:

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