Calculations, Chemical & Physical Change – Chemistry
The key terms of this Chemistry quiz include Chemical & Physical Change, Density, Mass, Volume.
A chemistry student needs 90.0 mL of dimethyl sulfoxide for an experiment. By consulting the CRC Handbook of Chemistry and Physics, the student discovers that the density of dimethyl sulfoxide is 1.10 g.cm-3. Calculate the mass of dimethyl sulfoxide the student should weigh out. Round your answer to3 significant digits.
99.0 g – correct
Take a look at this sketch, and then answer the questions below about the mass, volume and density of Objects D and C.
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Complete each row of the table below by filling in the missing exponent.
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Decide whether each proposed addition or subtraction of measurements is possible. If it is possible, write the result in the last column of the table. Be sure every answer you enter has the correct unit symbol.
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Chemical & Physical Change – Chemistry Quiz
There are four sketches below. The first sketch shows a sample of Substance X. The three sketches underneath it show three different changes to the sample. You must decide whether each of these changes is possible. If a change is possible, you must also decide whether it is a physical change or a chemical change.
Each sketch is drawn as if the sample were under a microscope so powerful that individual atoms could be seen. Also, you should assume that you can see the entire sample, and that the sample is in a sealed box, so that no matter can enter or leave.
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Classify the substance shown in the sketch below. You can click the other tabs in the sketch to get a magnified view. Be sure you check all the boxes on the right-hand side that are correct for this substance.
Note for advanced students: in some sketches the distance between particles has been exaggerated to make it easier to see each individual particle.
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An organic chemist measures the temperature T of a solution in a reaction flask. Here is the result.
T = 78. oC
Convert T to SI units. Round your answer to 0 decimal places.
Answer
351 K
Alternate Answer
T = 351. K
Complete each row of the table below by filling in the missing prefix.
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