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schepotkina [342]
2 years ago
11

Select the correct answer.

Chemistry
1 answer:
Yakvenalex [24]2 years ago
4 0
His model describes the reactivity of an element based on its number of valence electrons is the right answer but I don’t know what the other is.
Hope this helps:)
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Write a balanced equation for the complete oxidation reaction that occurs when methane (CH4) burns in air.
Lelechka [254]

Answer: The balanced equation for the complete oxidation reaction that occurs when methane (CH4) burns in air is CH_{4} + 2O_{2} \rightarrow CO_{2} + 2H_{2}O.

Explanation:

When a substance tends to gain oxygen atom in a chemical reaction and loses hydrogen atom then it is called oxidation reaction.

For example, chemical equation for oxidation of methane is as follows.

CH_{4} + O_{2} \rightarrow CO_{2} + H_{2}O

Number of atoms present on reactant side are as follows.

  • C = 1
  • H = 4
  • O = 2

Number of atoms present on product side are as follows.

  • C = 1
  • H = 2
  • O = 3

To balance this equation, multiply O_{2} by 2 on reactant side. Also, multiply H_{2}O by 2 on product side. Hence, the equation can be rewritten as follows.

CH_{4} + 2O_{2} \rightarrow CO_{2} + 2H_{2}O

Now, the number of atoms present on reactant side are as follows.

  • C = 1
  • H = 4
  • O = 4

Number of atoms present on product side are as follows.

  • C = 1
  • H = 4
  • O = 4

Since, the atoms present on both reactant and product side are equal. Therefore, this equation is now balanced.

Thus, we can conclude that balanced equation for the complete oxidation reaction that occurs when methane (CH4) burns in air is CH_{4} + 2O_{2} \rightarrow CO_{2} + 2H_{2}O.

4 0
2 years ago
2, classify the following molecules as polar or non polar.
Vitek1552 [10]

A. CH4= NON POLAR

B. CH3cl= POLAR

C. CO2= NON POLAR

D.  H2O2= POLAR

E. BCl3= NON POLAR

F. H2S​= SLIGHTLY POLAR

7 0
3 years ago
Which of the following elements has six valence electrons?<br> Be<br> B<br> C<br> N<br> O
Yakvenalex [24]
Oxygen (O) ,Neon (Ne),Argon (Ar)
7 0
2 years ago
The brown solid that formed is zinc copper oxygen iron
horsena [70]

Answer: Copper

Explanation:

Just took it on Edgen

4 0
3 years ago
Why is silicon used to make PV cells
Gnesinka [82]
Silicon is used in producing Pv celss because cells made ​​from the crystallized polycrystalline silicon have efficiencies in the range of 14-18% and a moderate price.
3 0
3 years ago
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