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Rasek [7]
3 years ago
7

Which of the following changes can alter the form of a substance but does not necessarily change it to an other substance?

Chemistry
1 answer:
Goshia [24]3 years ago
8 0

Answer:

  • The physical changes can alter the form of a substance but does not necessarily change it to an other substance

Explanation:

  • The physical properties of matter is one that does not depend on composition.It just change the form of matter into another form with changing into composition.
  • Physical properties include: appearance, texture, color, odor, melting point, boiling point, density, solubility, polarity, and many others.
  • The three states of matter are: solid, liquid, and gas. The melting point and boiling point are related to changes of the state of matter. All matter may exist in any of three physical states of matter.

Example:

  1. When water is boiled then it change into vapors. Now the form of water is change but its composition is same like water
  2. When water freezes into ice, now phase are different i.e water is liquid while ice is solid but both have same composition.
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Answer:

The number of atoms in 20 grams of Pa-234 is 5.14 ×10²² atoms

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Given that the molar mass of Pa-234 (protactinium) is 234.04331, we have

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Number of moles = Mass/(Molar mass) = 20/234.04331 = 0.0855 moles

One mole of Pa-234 contains 6.02×10²³ atoms, therefore, we have;

0.0855 moles of Pa-234 contains 0.0855× 6.02×10²³  = 5.14 ×10²² atoms

Therefore, the number of atoms in 20 grams of Pa-234 = 5.14 ×10²² atoms.

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