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aniked [119]
3 years ago
10

Am i the only one getting a red text saying my question is mean?

Chemistry
1 answer:
Triss [41]3 years ago
8 0

Answer:

I dont know

Explanation:

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Which of the following objects will have the greatest change in motion?<br><br> here's the image
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D

Explanation:

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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

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<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,

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

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Lithium-4 and Lithium-5 can be defined as:
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Answer:

A: isotopes

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Hello.

In this case, since isotopes are defined as atoms of the same element with the same atomic number (number of protons and electrons) but different mass number (atomic mass) we can represent them via the symbol of the element followed by a dash indicating the atomic mass of the occurring isotope, for instance, for carbon, we may find C-12, C-13 and even C-14 which is useful in dating techniques.

Therefore, Lithium-4 or Li-4 and Lithium-5 or Li-5 can be defined as isotopes.

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High potential for harm and abuse
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