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iren [92.7K]
3 years ago
7

What does a periodic trend look like on the periodic table?

Chemistry
2 answers:
Alexxandr [17]3 years ago
7 0
Periodic table is arranged and organized with special pattern or regular variation of the properties of an element with increasing atomic number, this is called periodic trend. So periodic trend look like a repeating pattern on the periodic table.
Some of the trends are density, atomic radius,melting point, boiling point, electronegativity etc.
tresset_1 [31]3 years ago
4 0

A periodic trend on the periodic table is represented by a repeating pattern


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Which atoms in the amino acids become the h2o molecule produced by their action in model?
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Atoms in the amino acids become the h₂O molecule produced by their action in the model and come off from the central carbon and nitrogen but not from the carboxyl, R side chain, or amine.

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Which of the major organ systems keeps you breathing?
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3 0
3 years ago
Read 2 more answers
A chemist dissolves 249.mg of pure perchloric acid in enough water to make up 380.mL of solution. Calculate the pH of the soluti
Alla [95]

Answer:

pH = 2.18

Explanation:

Perchloric acid (HClO₄) is a strong acid. This means that in an aqueous solution it completely dissociates into H⁺ and ClO₄⁻ species.

First we <u>convert 249 mg HClO₄ into moles</u>, using its <em>molecular weight</em>:

  • 249 mg HClO₄ ÷ 100.46 mg/mmol = 2.49 mmol HClO₄

<em>Because it is a strong acid</em>, 2.49 mmol HClO₄ = 2.49 mmol H⁺

We <u>calculate the molar concentration of H⁺</u>:

  • 2.49 mmol H⁺ / 380 mL = 6.52x10⁻³ M

Finally we <u>calculate the pH of the solution</u>:

  • pH = -log[H⁺] = -log(6.52x10⁻³)
  • pH = 2.18

4 0
2 years ago
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