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ololo11 [35]
3 years ago
5

Why is the periodic table such as useful tool for chemist?

Chemistry
1 answer:
Tomtit [17]3 years ago
3 0
The periodic table is useful tool for chemist since we can see what is the atomic and mass number for each atom.

Atomic number is equal to how many protons and electrons in it

Mass number is equal to protons + Neutrons.
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Write a chemical equation for NH4+(aq) showing how it is an acid or a base according to the Arrhenius definition. Express your a
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Answer:

NH4+(aq)  → NH3(aq) + H+(aq)

Explanation:

Following arrhenius, an acid can be defined as:

An Arrhenius acid is a substance that, when added to water, increases the concentration of H+ ions in water.

NH4+(aq)  → NH3(aq) + H+(aq)

The ammonium ion acts as a weak acid in aqueous solution, dissociating into ammonia and a hydrogen ion.

An Arrhenius base is a substance that, when added to water, increases the concentration of OH- ions in water.

NH4+(aq) will not dissciate in OH- ions. So it's not a base, but an acid.

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3 years ago
HELP ASAP 20 OR MORE POINTS!!!!
pishuonlain [190]
<h2>YeS im Am fRom pLanet k12 And brinG anD imPortant MesSage </h2>

  • The answer to your question is, <u><em>There are only so many ways matter can arrange itself within that infinite universe.</em></u>

<h2><em>Also if your on the same test as me heres some other sTuff that was on my test </em></h2><h2><em> </em></h2>

 Question 1 (1 point)  

In Brian Greene's "A Physicist Explains Why Parallel Universes May Exist", what reason does Greene give for why he believes parallel universes may exist?

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<em>   </em>

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<h2><em>HOPE THIS HELPS ANYONE IF IT DOES THANK AND RATE FOR A FREE COOKIE :D </em></h2>
6 0
3 years ago
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Chemical energy is released when molecular bonds are formed.<br> True<br> False
sveticcg [70]
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The pka value for the carboxylic acid group in acetic acid is 4.75. write the predominant structure of acetic acid at (a ph=1, (
Scorpion4ik [409]
Hello!

A) At pH=1

This pH is lower than the value for the pKa, so Acetic acid wouldn't be ionized, but the equilibrium would be displaced to CH₃COOH

CH₃COOH ⇄ CH₃COO⁻ + H₃O⁺ (equilibrium displaced to the left)

The chemical structure for CH₃COOH is the first one in the attached images.

B) At pH=7

This pH is higher than the value for the pKa, so Acetic acid would be ionized, and the equilibrium would be displaced to CH₃COO⁻

CH₃COOH ⇄ CH₃COO⁻ + H₃O⁺ (equilibrium displaced to the right)

The chemical structure for CH₃COO⁻ is the second one in the attached images.

Have a nice day!

7 0
2 years ago
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