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katrin2010 [14]

3 years ago

8

Which statement accurately describes a light-year?(Select One) It is the shape of a galaxy. It is the distance that light travel

s in a year. It is a yearly measurement of light given off by stars. It is the amount of time it takes light to travel one million kilometers.

2 answers:

Vitek1552 [10]3 years ago

6 0

Answer:

B

Explanation:

edge 2020

Strike441 [17]3 years ago

3 0

Answer: B

Explanation:

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3 years ago

How many electrons are transferred in the following reaction?

Semmy [17]

Answer:

6

Explanation:

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

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

For the given chemical reaction:

$Mg(s)+Al^{3+}(aq.)\rightarrow Al(s)+Mg^{2+}(s)$

The half cell reactions for the above reaction follows:

Oxidation half reaction: $Mg\rightarrow Mg^{2+}+2e^-$

Reduction half reaction: $Al^{3+}+3e^-\rightarrow Al$

Magnesium is loosing 2 electrons to form the magnesium cation. Thus, it is getting oxidized. Aluminum anion is gaining 3 electrons to form Aluminum. Thus, it is getting reduced.

Thus, balancing the half-reactions as:-

Oxidation half reaction: $3Mg\rightarrow 3Mg^{2+}+6e^-$

Reduction half reaction: $2Al^{3+}+6e^-\rightarrow 2Al$

Thus, total number of electrons transferred = 6

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3 years ago

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