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harkovskaia [24]
3 years ago
6

Why do some metals loose their shine overtime but gold does not?

Chemistry
1 answer:
aivan3 [116]3 years ago
5 0
Becuase gold is very unreactive and does not react with oxygen whereas other metals do, therefore they tarnish and gold does not
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The radioisotope phosphorus-32 is used in tracers for measuring phosphorus uptake by plants. The half-life of phosphorus-32 is 1
Harman [31]

Answer:

54 days

Explanation:

We have to use the formula;

0.693/t1/2 =2.303/t log Ao/A

Where;

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t= time taken for the activity to fall to 7.34% of its original value

Ao=initial activity of phosphorus-32

A= activity of phosphorus-32 after a time t

Note that;

A=0.0734Ao (the activity of the sample decreased to 7.34% of the activity of the original sample)

Substituting values;

0.693/14.3 = 2.303/t log Ao/0.0734Ao

0.693/14.3 = 2.303/t log 1/0.0734

0.693/14.3 = 2.6/t

0.048=2.6/t

t= 2.6/0.048

t= 54 days

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insens350 [35]

Answer:

4.83% of acetic acid in the vinegar

Explanation:

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3 years ago
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