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Elden [556K]
4 years ago
10

Write the chemical equations involved in this experiment and how that the rate of disappearance of [S2O8^2-] is proportional to

the rate of appearance of the blue-black color of the starch-iodine complex.
Chemistry
1 answer:
Ne4ueva [31]3 years ago
5 0

S₂O₈²⁻

(aq) + 2I⁻

(aq) → I₂(aq) + 2SO₄

²⁻(aq)

2S₂O₃²⁻

(aq) + I₂(aq) → S₄O₆²⁻

(aq) + 2I⁻

(aq)

<u>Explanation:</u>

S₂O₈²⁻

(aq) + 2I⁻

(aq) → I₂(aq) + 2SO₄

²⁻(aq)

To measure the rate of this reaction we must measure the rate of concentration change of one of  the reactants or products. To do this, we will include (to the reacting S₂O₈

²⁻  and I⁻

i) a small amount of sodium thiosulfate, Na₂S₂O₃,

ii) some starch indicator.

The added Na₂S₂O₃ does not interfere with the rate of above reaction, but it does consume the I₂  as soon as it is formed.

2S₂O₃²⁻

(aq) + I₂(aq) → S₄O₆²⁻

(aq) + 2I⁻

(aq)

This reaction is much faster than the previous, so the conversion of I2 back to I⁻  is  essentially instantaneous.

rate = \frac{dI2}{dt} = \frac{1/2 [S2O3^2^-]}{t}

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At what temperature is a gas likely to have the lowest rate of diffusion? (4 points)
Mademuasel [1]

Answer:

15°

Explanation:

At the lowest temperature the gas will have the lowest rate of diffusion because diffusion deals with the motion of particles.

  • Diffusion is the movement of particles from a region of high concentration to that of a lower concentration.
  • According to the kinetic molecular theory of gases, the temperature of a gas is a measure of the average kinetic energy of the molecules.
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The gas with the lowest temperature will be the slowest to diffuse.

6 0
3 years ago
Read 2 more answers
For many years chloroform (CHCl3) was used as an inhalation anesthetic in spite of the fact that it is also a toxic substance th
Debora [2.8K]

Hey there!:

Molar mass:

CHCl3 = ( 12.01 * 1 )+ (1.008 * 1 ) + ( 35.45 * 3 ) => 119.37 g/mol

C% =  ( atomic mass C / molar mass CHCl3 ) * 100

For C :

C % =  (12.01 / 119.37 ) * 100

C% = ( 0.1006 * 100 )

C% =  10.06 %

For H :

H% = ( atomic mass H / molar mass CHCl3 ) * 100

H% = ( 1.008 / 119.37 ) * 100

H% = 0.008444 * 100

H% = 0.8444 %

For Cl :

Cl % ( molar mass Cl3 / molar mass CHCl3 ):

Cl% =  ( 3 * 35.45 / 119.37 ) * 100

Cl% =  ( 106.35 / 119.37 ) * 100

Cl% = 0.8909 * 100

Cl% = 89.9%


Hope that helps!

4 0
4 years ago
What type of reaction is represented by the following chemical equation?
Ivan
Combustion! CH4, which is methane, reacts with oxygen to form carbon dioxide. (For future reference, if a compound is reacted with ONLY oxygen it is sure to be a combustion reaction)
5 0
3 years ago
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Determine the mass of butane gas that was released from the lighter and collected in the gas collection tube. Use the given belo
ruslelena [56]
There are several information's already given in the question. Based on those information's, the answer can be easily deduced. 
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Now
<span>PV=nRT
</span>(1.2) * (0.09) = n * (0.0821) * (297)
n = 0.00443
Mass of Butane = 32.105 - 31. 844
                          = 0.261
Then
Molar mass of Butane gas = 0.261/.00443
                                 = 58.92
6 0
3 years ago
How do new traits enter a population?
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Answer: By the way that population is treated and also by new borns.

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