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2 years ago

In the whole earth, the four most common elements (by mass) are oxygen, silicon, magnesium, and ________.

Chemistry

2 answers:

Svetllana [295]2 years ago

8 0

I believe that the answer is iron.

dalvyx [7]2 years ago

5 0

Hey there!

In the whole earth, the four most common elements (by mass) are oxygen, silicon, magnesium, and ________.

Answer: iron

Hope this helps
Have a great day (:

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During a lunar eclipse, the moon appears to be darkened because _______________ is casting a shadow on it.

stealth61 [152]

Answer:

the earth

Explanation:

because the moon is blocking the light of the sun

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2 years ago

A galvanic cell with E o cell = 0.30 V can be constructed using an iron electrode in a 1.0 M Fe(NO3)2 solution, and either a tin

Andreyy89

Answer: The half reactions are written below.

Explanation:

Oxidation reaction is defined as the reaction in which an atom looses its electrons. The oxidation number of the atom gets increased during this reaction.

$X\rightarrow X^{n+}+ne^-$

Reduction reaction is defined as the reaction in which an atom gains electrons. The oxidation number of the atom gets reduced during this reaction.

$X^{n+}+ne^-\rightarrow X$

We are given a chemical cell which is Fe-Sn cell. The half reaction follows:

Oxidation half reaction: $Fe\rightarrow Fe^{2+}+2e^-;E^o_{Fe^{2+}/Fe}=-0.44V$

Reduction half reaction: $Sn^{2+}+2e^-\rightarrow Sn;E^o_{Sn^{2+}/Sn}=-0.14V$

The substance having highest positive $E^o$ potential will always get reduced and will undergo reduction reaction. Here, zinc will always undergo reduction reaction will get reduced.

Total cell reaction: $Fe+Sn^{2+}\rightarrow Fe^{2+}+Sn$

Hence, the half reactions are written above.

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3 years ago

Which one of the following is correct about automobile batteries.

Rufina [12.5K]

Answer:

I think it's A

Explanation:

I'm sorry if it's not correct. I'm tryna get enough points to ask my question

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3 years ago

Which of the following you do NOT need to pay attention while using a centrifuge?

Phoenix [80]

Answer:

The radius of the centrifuge.

Explanation:

Hello,

Since the radius of the centrifuge is just a design parameter, it wouldn't be a cause of failure because it is used to know how many tubes could be fitted in into the centrifuge. On the other hand, keeping you attention away from other factors could turn into a failure as long as the sample could be poured down or just turn out inadequate for the expected results.

Best regards.

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3 years ago

What is a picture of homologous pairs of chromosomes and sex chromosomes?

Alecsey [184]

Answer:

allene?

Explanation:

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3 years ago

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