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gladu [14]
3 years ago
13

Student mixes 5 g of sand into a beaker of 20 g of water. Is this a physical or chemical change-why?

Chemistry
1 answer:
jek_recluse [69]3 years ago
6 0
Physical because it doesn't do with fire
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What is an example of a neutral ion.
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A neural sodium ion.
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How many atoms are in 45.22 moles of strontium​
AleksandrR [38]

Answer:

272.31× 10²³ atom of strontium

Explanation:

Given data:

Number of moles of strontium = 45.22 mol

Number of atoms = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

45.22 mol × 6.022 × 10²³ atom / 1 mol

272.31× 10²³ atom

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How do i solve number 36?
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Which is most likely to happen during a precipitation reaction?
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Answer:

I think its B

Explanation:

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