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Vika [28.1K]
3 years ago
14

Which of the following statements is true?

Chemistry
1 answer:
UkoKoshka [18]3 years ago
7 0
I believe A.
Calcium and potassium help with blood pressure, muscles, and bones.

For b, there is little helium in the atmosphere.
For C, the center is made of neutrons and protons, electrons are far away.
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Name the fundamental unit involved in the derived unit joule?​
tangare [24]

Answer:

Energy

Explanation:

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The number of electrons in neutral atoms of the elements
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3 years ago
What is the chemical formula for the compound magnesium perchlorate? Use the list of polyatomic ions and the periodic table to h
8_murik_8 [283]

The chemical formula for the compound magnesium perchlorate is Mg(ClO₄)₂

Magnesium perchlorate or Mg(ClO₄)₂ is an ionic compound.

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6 0
2 years ago
How much time is required to plate out 20.0 g of Zn from a solution containing Zn2+ ions, using a current of 2.00 amperes?
lyudmila [28]

Answer: 494.872mins

Explanation:

M= MrIt÷n

M=20g

Mr=65g/mol

I=2A

1 farad= 96500

For zinc with 2ions

2×96500= 193000

M×n= MrIt

T= M×n÷MrI

t= 20×193000/2×65

t= 3860000/130

t= 29692.307sec

t=29692.307/60

t= 494.872 mins

7 0
3 years ago
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