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guajiro [1.7K]
3 years ago
5

What is a valence electron

Chemistry
1 answer:
shtirl [24]3 years ago
3 0

is an outer shell electron that is associated with an atom

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PLEASE HELP WILL GIVE BRAINLIEST
anastassius [24]

Answer:

should be  58.6c

Explanation:

6 0
3 years ago
Plz answer the question in the picture.
astra-53 [7]

Answer:

a

Explanation:

a mixture is a material made up of two or more different substances which are not chemically combined. A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids.

5 0
3 years ago
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Which method can be used to separate the components of a solution? Check all that apply.
cricket20 [7]
Filtration: To remove solid substance from liquid. 
Evaporation: To remove dissolved substance from liquid.
Distillation: To separate 2 liquids with different boiling points.
6 0
3 years ago
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Can someone please help me and ill mark you as brainlest
r-ruslan [8.4K]

Answer:

can you show the question so we can read it

3 0
3 years ago
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The chemical equation for a reaction between K2Cr2O7 and HCl is shown.
deff fn [24]

K2Cr2O7 + 14HCl → 2CrCl3 + 2KCl + 3Cl2 + 7H2O

the correct option is :

K2Cr2O7, because the oxidation number of Cr changes from +6 to +3.


<u>Oxidation number of Cr in K2Cr2O7 is:</u>

K2Cr2O7 = 2K + 2 Cr + 7 O

= 2(+1) + 2Cr + 7(-2)

= 2 + 2Cr -14

[total charge on K2Cr2O7 = 0], Hence;

2 + 2Cr -14 = 0

2Cr -12 = 0

2Cr = 12

Cr = 12/2

<u>Cr = +6</u>


<u>Oxidation number of Cr in CrCl3 is:</u>

CrCl3 = Cr + 3Cl = 0

Cr + 3(-1) = 0

Cr -3 = 0

<u>Cr = +3</u>

Hence Cr is changing its oxidation number from

+6 in K2Cr2O7 to +3 in CrCl3.

Since the oxidation number of Cr [ +6 → +3] is decreasing here,

Cr is getting reduced.

 

so K2Cr2O7 is an oxidizing agent,as it is getting itself reduced and oxidizes others.

3 0
3 years ago
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