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polet [3.4K]
3 years ago
8

Which of the following shows a decrease in entropy?

Chemistry
1 answer:
shusha [124]3 years ago
4 0
Precipitation hope this helped you 
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Which of the following best demonstrates kinetic energy?
Novay_Z [31]

Hey there!

Kinetic energy means that something is in motion.

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How many grams do 3.6 x10^20 atoms of silicon weigh?
creativ13 [48]
First, we divide the number of atoms of silicon given in the problem above by Avogadro's number 6.6022 x10^23. This will give us the number of moles of silicon. Then, we multiply the number of moles by the molar mass of silicon. 
number of moles = (3.6 x 10^20 atoms/6.022x10^23 atoms) = 5.97x10^-4 moles
Then, multiplying by the molar mass
                  (5.97x10^-4 moles)(28.0855 g/mol) = 0.017 grams
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2 years ago
What IONS are present in MgCO₃ (magnesium carbonate)? Mark
Alja [10]

Answer:

Answer:

Explanation:

"Magnesium is an alkaline earth metal, and forms a Mg2+ ion. And carbonate ion, CO2−3 , has an equal an opposite charge. And thus the ionic species is MgCO3"

4 0
3 years ago
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

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2 years ago
1. If you are 2.3 meters tall, what is your height in inches?
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90.5 inches bsbsjannebdhanwbshajnx
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