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FinnZ [79.3K]
3 years ago
10

Which of the following is a scientific question? O A. How can I make a peach cobbler? O B. What chemicals cause most plants to b

e green? C. What is the best color for my room? O D. Do black dogs make better pets than brown dogs?​
Chemistry
1 answer:
igor_vitrenko [27]3 years ago
5 0
The answer is B. Because think about it, it’s not a scientific fact that brown dogs are better pets, and the best color for your room isn’t it because the answer would be an opinion of someone not a fact. I hope this might help you.
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A manganese electrode was oxidized electrically. If the mass of the electrode decreased by 225 mg during the passage of 1580 cou
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Answer:

<u>Oxidation state of Mn = +4</u>

Explanation:

Atomic mass of Mn = 55g/mol

From Faraday's law of electrolysis,

Electrochemical equivalent = \frac{mass}{charge}

i.e Z = \frac{m}{Q} = \frac{0.225g}{1580C} = 0.0001424 g/C

But Equivalent weight, E = atomic mass ÷ valency  = Z × 96,485

⇒ \frac{55}{valency} = 0.0001424 × 96,485

<u>∴ Valency of Mn = +4</u>

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the answer that you are looking for is d

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