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vichka [17]
3 years ago
5

Which is the correct Lewis structure for carbon tetrabromide (CBr4), in which a central carbon atom is bound to four atoms of th

e group 7A element bromine?
A



B



C



D

Chemistry
2 answers:
AveGali [126]3 years ago
8 0
The answer is b hope I helped
artcher [175]3 years ago
7 0

Answer:

B

Explanation:

Hello,

In this case, since carbon is in group IVA, it has four valence electrons so it needs four bonds to attain the octet. However, as carbon and bromine are bonded, carbon needs four bromines as each bromine provides only one electron for them to attain the octet as bormine has seven valence electrons for which it is in group VIIA. Therefore, the Lewis structure showing the four bonds and the seven free electrons of each bromine is B.

Best regards.

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How many of the following are oxidation-reduction reactions? I. reaction of a metal with a nonmetal II. synthesis III. combustio
nadezda [96]

Answer : The oxidation-reduction reactions are:

I. reaction of a metal with a nonmetal

II. synthesis

III. combustion

Explanation :

Redox reaction or Oxidation-reduction reaction : It is defined as the reaction in which the oxidation and reduction reaction takes place simultaneously.

Oxidation reaction : It is defined as the reaction in which a substance looses its electrons. In this, oxidation state of an element increases. Or we can say that in oxidation, the loss of electrons takes place.

Reduction reaction : It is defined as the reaction in which a substance gains electrons. In this, oxidation state of an element decreases. Or we can say that in reduction, the gain of electrons takes place.

I. Reaction of a metal with a nonmetal :

When sodium react with chlorine gas then it react to give sodium chloride.

2Na+Cl_2\rightarrow 2NaCl

In this reaction, the oxidation state of sodium changes from (0) to (+1) and shows oxidation and the oxidation state of chlorine changes from (0) to (-1) and shows reduction. So, It is an oxidation-reduction reaction.

II. Synthesis reaction :

A chemical reaction where multiple substances or reactants combine to form a single product.

When hydrogen react with oxygen then it react to give water.

2H_2+O_2\rightarrow 2H_2O

In this reaction, the oxidation state of hydrogen changes from (0) to (+1) and shows oxidation and the oxidation state of oxygen changes from (0) to (-2) and shows reduction. So, It is an oxidation-reduction reaction.

III. Combustion reaction :

A chemical reaction in which a hydrocarbon reaction with the oxygen to give product as carbon dioxide and water.

When methane react with oxygen gas then it react to give carbon dioxide and water.

CH_4+2O_2\rightarrow CO_2+2H_2O

In this reaction, the carbon of methane gain oxygen and shows oxidation and the oxygen gas gain hydrogen and shows reduction. So, It is an oxidation-reduction reaction.

IV. Precipitation reaction :

It is defined as the reaction in which an insoluble salt formed when two aqueous solutions are combined.

The insoluble salt that settle down in the solution is known an precipitate.

It is a double displacement reaction. So, it is not an oxidation-reduction reaction.

V. Decomposition reaction :

A chemical reaction in which the the larger molecule decomposes to give two or more smaller molecules.

The oxidation state remains same on reactant and product side. So, it is not an oxidation-reduction reaction.

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3 years ago
BRAINLIESTT ASAP! PLEASE HELP ME :)<br><br> Compare stored mechanical energy and mechanical energy.
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Stored mechanical energy is energy stored and awaiting to be used and mechanical energy is the energy that was stored being used.

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The most reactive metals are located in which area of the periodic table?
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The answer is b.Far left
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What is the value of all conversion factors that are used in dimensional analysis
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All the conversions have a net value of 1
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Name each subatomic particle, its charge, and its location in an atom.
Tpy6a [65]
Protons: charge +1, have a mass of 1 and are found in the nucleus 

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Electrons: charge -1, have a mass of 1/840 and are found on the outside of the nucleus 

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