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ANEK [815]
3 years ago
14

What is atomwhat is atom​

Chemistry
2 answers:
Anna11 [10]3 years ago
7 0
An atom is a chemical that you cannot see but helps you live and breathe
Elanso [62]3 years ago
6 0

Answer:

<em>An</em><em> </em><em>atom</em><em> </em><em>is</em><em> </em><em>a</em><em> </em><em>chemical </em><em>substance </em><em>which</em><em> </em><em>exist </em><em>freely </em><em>in</em><em> </em><em>natu</em><em>re</em><em> </em><em>without </em><em>any</em><em> </em><em>reaction </em><em>.</em>

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DiKsa [7]
The first one is right and so is eight you have to add them together to see if they go together if they dont add what is missing
5 0
3 years ago
How many moles of calcium chloride, cacl2, can be added to 1.5 l of 0.020 m potassium sulfate, k2so4, before a precipitate is ex
Brut [27]
When CaSO4 → Ca2+ + SO4
So when we have Ksp = [Ca2+][SO4]

when Ksp = 4.93 x 10^-5
and [SO4] = 0.02 M 
so by substitution we can get [Ca2+] 
4.93x10^-5 = [Ca2+] [0.02]
∴ [Ca2+] = 0.0025 mol/L

∴ the moles of calcium chloride = 0.0025 mol / L * 1.5 L
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4 0
3 years ago
If a solution conducts electricity and has a pH value of 7 then it could be
stealth61 [152]
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3 years ago
What advice would you give to a person who handles hydrogen and oxygen in their workplace?I think I have an idea of what advice
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8 0
3 years ago
The element lanthanum has two stable isotopes, lanthanum-138 with an atomic mass of 137.9 AMU and lanthanum-139 with an atomic m
dmitriy555 [2]

Answer:

A. there is an isotope of lanthanum with an atomic mass of 138.9

Explanation:

By knowing the different atomic masses of both Lanthanum atoms, we can not tell anything about their occurence in nature. Therefore, all the last three options are incorrect. Because, the atomic mass does not tell anything about the availability or natural abundance of an element.

Now, the isotopes of an element are those elements, which have same number of electrons and protons as the original element, but different number of neutrons. Therefore, they have same atomic number but, different atomic weight or atomic masses.

Hence, by looking at an elements having same atomic number, but different atomic masses, we can identify them as isotopes.

Thus, the correct option is:

<u>A. there is an isotope of lanthanum with an atomic mass of 138.9.</u>

7 0
3 years ago
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