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topjm [15]
3 years ago
5

How do chemists identify elements & compounds?

Chemistry
1 answer:
padilas [110]3 years ago
3 0
Chemsits identify elements and compounds by using the Periodic Table. All elements have Atomic Numbers, Chemical Names, Atomic Mass, Period, and are usually colored and put into their group.
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A spectrophotometer measures the transmittance or the absorbance, or both, of a particular wavelength of light after it has pass
Taya2010 [7]

Answer:

b. The transmittance of the cuvette must be measured in the same place each time.

Explanation:

When using a spectrophotometer, light passes not only through the liquid sample, it also passes through the cuvette. This means that each time a reading is made, you not only measure the transmittance/absorbance of the sample, <u>but of the cuvette as well</u>.

For this reason it's important that the reading of the cuvette's absorbance remains the same through all the process, so the answer is b), because different faces of the cuvette may have different absorbances.

4 0
4 years ago
A deck of cards has dimensions 8.9cm x 5.72cm x 1.82 cm. What is the volume of the deck in cubic centimeters?
arsen [322]

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92.65256 cm^3

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5 0
3 years ago
Which of the following pH numbers indicates a strong alkali?<br> a. 1<br> b. 5<br> c. 7<br> d.) 14
pochemuha

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1 is the correct answer of the question

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