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tester [92]
2 years ago
9

Which statements are true about physical changes? Select all that apply.

Chemistry
1 answer:
Vadim26 [7]2 years ago
6 0

Answer:

a

Explanation:

because physical changes are reversible while chemical changes are irreversible

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Convert 6.71 moles NH3 to number of molecules.
svetlana [45]

Answer: There are 40.41 \times 10^{23} molecules present in 6.71 moles of NH_{3}.

Explanation:

Given: Moles of NH_{3} = 6.71 mol

According to the mole concept, 1 mole of every substance contains 6.022 \times 10^{22} molecules.

Therefore, molecules present in 6.71 moles are calculated as follows.

Molecules = moles \times 6.022 \times 10^{23}\\= 6.71 \times 6.022 \times 10^{23}\\= 40.41 \times 10^{23}

Thus, we can conclude that there are 40.41 \times 10^{23} molecules present in 6.71 moles of NH_{3}.

6 0
3 years ago
The state of matter that has molecules with the least random molecular arrangement:
Ksenya-84 [330]
Gas. Molecules in gas are able to move and vibrate around each other more freely than the molecules in liquids and/or solids due to the great amount of space in between them. Hope this helps! :)
5 0
2 years ago
What is the correct formula that would result from the combination of the two ionic species?
Soloha48 [4]

Answer:

CsCl

Explanation:

The ionic species are:

           Cs⁺   and Cl⁻

6 0
2 years ago
How many ounces are in 0.442 L? Use dimensional analysis to
vovangra [49]

Answer:

14.945798 in us fluid ounce

Explanation:

3 0
2 years ago
Does an astronaut have more mass on earth then space? why or why not?
katovenus [111]

Answer:

No

Explanation:

No, his mass remains the same no matter where he is in the universe.

But then again the moon has less gravitational pull, therefore your weight and mass will be smaller in space and on the moon than on earth

I hope this was helpful! ;)

3 0
3 years ago
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