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kupik [55]
4 years ago
8

Which Group is in the second column of the periodic table?

Chemistry
1 answer:
WINSTONCH [101]4 years ago
8 0

Answer:

alkaline

Explanation:

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A second grade student approaches you and says that she learned that a lunar eclipse is the result of the Earth blocking the sun
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Why do scorpions glow on a black light?
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2.3 x 10²¹ particles H = __________ mol H (round to the nearest thousandth)
Natalka [10]

Taking into account the definition of avogadro's number, 3.82×10⁻³ moles of H are 2.3×10²¹ particles of H.

<h3>Avogadro's Number</h3>

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

<h3>This case</h3>

Then you can apply the following rule of three: if 6.023×10²³ particles are contained in 1 mole of H, then 2.3×10²¹ particles are contained in how many moles of H?

amount of moles of H= (2.3×10²¹ particles × 1 mole)÷ 6.023×10²³ particles

<u><em>amount of moles of H= 3.82×10⁻³ moles</em></u>

Finally, 3.82×10⁻³ moles of H are 2.3×10²¹ particles of H.

Learn more about Avogadro's Number:

<u>brainly.com/question/11907018?referrer=searchResults </u>

<u>brainly.com/question/1445383?referrer=searchResults </u>

<u>brainly.com/question/1528951?referrer=searchResults</u>

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3 years ago
The Sulphate of x is XSO4 valency of x is
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/lk ac

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3 years ago
CuSO4 . 5H2O is dehydrated to form Copper (ii) sulfate. Is this a physical or chemical change? Explain.
Paraphin [41]

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It is a physical change.

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• This is because when anhydrated copper (ii) sulfate is heated, the water evaporates to form anhydrous copper (ii) sulfate.

• evaporation is a physical change

.

3 0
3 years ago
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