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Tpy6a [65]
3 years ago
6

In order to improve the condition of your muscular system, you could participate in aerobic activity at least __________. A. 3 m

inutes 5 times a week B. 10 minutes 4 times a week C. 30 minutes 3 times a week D. 50 minutes 3 times a week   Please select the best answer from the choices provided. A B C D
Chemistry
2 answers:
lara [203]3 years ago
8 0
The answer is C. 
30 mins 3 times a week. 
zlopas [31]3 years ago
5 0
I think it would be C
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2 years ago
The concentration of hydrogen peroxide solution can be determined by
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The question is incomplete, the complete reaction equation is;

The concentration of a hydrogen peroxide solution can be determined by titration

with acidified potassium manganate(VII) solution. In this reaction the hydrogen

peroxide is oxidised to oxygen gas.

A 5.00 cm3 sample of the hydrogen peroxide solution was added to a volumetric flask

and made up to 250 cm3 of aqueous solution. A 25.0 cm3 sample of this diluted

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(If you have been unable to write an equation for this reaction you may assume that

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Answer:

2.275 M

Explanation:

The equation of the reaction is;

2 MnO4^-(aq) + 16 H^+(aq) + 5H2O2(aq) -------> 2Mn^+(aq) + 10H^+ (aq) + 8H2O(l)

Let;

CA= concentration of MnO4^- =  0.0187 mol dm–3

CB = concentration of H2O2 = ?

VA = volume of MnO4^- = 24.35 cm3

VB = volume of H2O2 = 25.0 cm3

NA = number of moles of  MnO4^- = 2

NB = number of moles of H2O2 = 5

From;

CAVA/CBVB = NA/NB

CAVANB = CBVBNA

CB = CAVANB/VBNA

CB = 0.0187 * 24.35 * 5/25.0 * 2

CB = 0.0455 M

Since  

C1V1 = C2V2

C1 = initial concentration of H2O2 solution = ?

V1 = initial volume of H2O2 solution =  5.0 cm3

C2 = final concentration of H2O2 solution= 0.0455 M

V2 = final volume of H2O2 solution = 250 cm3

C1 = C2V2/V1

C1 = 0.0455 * 250/5

C1 = 2.275 M

8 0
3 years ago
What is the name of the compound K3N?
alexdok [17]
The name of the compound K3N is potassium nitride (C).
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3 years ago
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Is an example of the carbon cycle occurring slowly?(1 point)
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7 0
2 years ago
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hope this helps!<3

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2 years ago
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