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bazaltina [42]
2 years ago
12

4. What is the rarest element that is natural to earth?

Chemistry
2 answers:
krek1111 [17]2 years ago
5 0
Astatine it’s also a chemical element
never [62]2 years ago
3 0

Answer:

Astatine

Explanation:

Astatine is a chemical element with the symbol At and atomic number 85. It is the rarest naturally occurring element in the Earth's crust, occurring only as the decay product of various heavier elements.

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Answer:

Option B

Explanation:

As Brønsted-Lowry theory states, acids are the ones that can donate protons.

When a proton is donated, it is released to become medium more acidic.

HCl is a strong acid.

HCl (l) + H₂O (l)  →  H₃O⁺ (aq) +  Cl⁻(aq)

These always reffers to strong acid where the dissociation is 100% completed.

In a weak acid, dissociation is not 100% complete, that's why we have an equilibrium.

HA (l) + H₂O (l)  ⇄  H₃O⁺ (aq) +  A⁻(aq)                   Ka

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Which tool or tools would you use to measure and compare the mass of a cup of fresh water and a cup of salt water
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Hope this helped ^_^
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Why can characteristics properties be used to identify unknown substances
frozen [14]

Characteristic properties are used because the sample size and the shape of the substance does not matter.

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Explanation:

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