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oee [108]
4 years ago
5

What important result did Becquerel observe when he placed the uranium salt crystals and unexposed photographic film in a drawer

?
-The crystals phosphoresced within the drawer and exposed the film.
-The crystals did not phosphoresce within the drawer but did expose the film.
-The crystals phosphoresced within the drawer but did not expose the film.
-The crystals did not phosphoresce within the drawer and did not expose the film.
Chemistry
2 answers:
vovangra [49]4 years ago
7 0

The correct answer is "The crystals did not phosphoresce within the drawer but did expose the film."

Becquerel  is credited to have discovered radioactivity. Becquerel was studying the properties of x-ray using naturally fluorescent minerals. Uranium shows radioactive decay. It is the high energy invisible radiation from uranium that exposed the photographic film.

nexus9112 [7]4 years ago
4 0
<span>B) The crystals did not phosphoresce within the drawer but did expose the film</span>
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<u>Answer:</u> The volume of HBr solution required is 130.16 mL

<u>Explanation:</u>

To calculate the concentration of base, we use the equation given by neutralization reaction:

n_1M_1V_1=n_2M_2V_2

where,

n_1,M_1\text{ and }V_1 are the n-factor, molarity and volume of acid which is H_2SO_4

n_2,M_2\text{ and }V_2 are the n-factor, molarity and volume of base which is KOH

We are given:

n_1=2\\M_1=123\times 10^{-4}M=0.0123M\\V_1=50mL\\n_2=1\\M_2=0.00945M\\V_2=?mL

Putting values in above equation, we get:

2\times 0.0123\times 50=1\times 0.00945\times V_2\\\\V_2=130.16mL

Hence, the volume of KOH solution required is 130.16 mL

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4 years ago
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Each species is a separate type of organism.

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brainly.com/question/1304906

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