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coldgirl [10]
2 years ago
15

Which type of change or reaction always results in a new substance?

Mathematics
1 answer:
OLEGan [10]2 years ago
5 0

Answer:

Chemical Change-

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The mass of a an atom of helium is 6.65 x 10^−24. Use scientific notation to express the mass of 250 helium atoms.
melisa1 [442]
<span>1.6625 x 10−21</span>

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1.
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Which values of x are solutions to the inequality?
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Step-by-step explanation:

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x

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