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hram777 [196]
3 years ago
7

Is sand biotic or abiotic

Chemistry
1 answer:
Vsevolod [243]3 years ago
8 0
Non living things are abiotic so sand is abiotic
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A jeweler guarantees that a piece of jewelry is at least 95% gold, by mass. You consider buying a piece of gold jewelry that wei
ELEN [110]
The density of the sample is:
Density = mass / volume
Density = 9.85 / 0.675
Density = 14.6 g/cm³

If the sample has 95% gold, and 5% silver, its density should be:
0.95 x 19.3 + 0.05 x 10.5
Theoretical density = 18.9 g/cm³

The difference in theoretical and actual densities is very large, making it likely that the jeweler was not telling the truth.
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3 years ago
Calculate the percent activity of the radioactive isotope strontium-89 remaining after 5 half-lives.
maria [59]
The answer to this question would be: 3.125%

Half-life is the time needed for a radioactive molecule to decay half of its mass. In this case, the strontium-89 is already gone past 5 half lives. Then, the percentage of the mass left after 5 half-lives should be:
100%*(1/2^5)= 100%/32=3..125%
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2 years ago
How many hydrogen atoms do you have four molecules of glucoes
Gnoma [55]

Molecules of glucose (blood sugar) contain 6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms.

Hope this helped :)

8 0
2 years ago
How many different design ideas of the puff car do you need to draw? Question options:
Makovka662 [10]

Answer:

Im not really sure

Explanation:

I think 6 or 3

5 0
2 years ago
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Classify each of the reactions listed below as a single-displacement, double-displacement, synthesis,
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Answer:

1) Reaction

3)

4)Single displacement reaction

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2 years ago
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