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Whitepunk [10]
3 years ago
6

Yosef is playing with different kinds of rubber bands. Some are very narrow and some are quite wide. Yosef is curious about the

rubber bands and develops the following scientific question: Does the width of a rubber band affect how easy it is to stretch it? He decides to develop a hypothesis to test this scientific question. What could Yosef’s hypothesis be?
Chemistry
2 answers:
Kamila [148]3 years ago
7 0
Yosef's hypothesis could be:
The larger the width of a rubber band, the harder it is to stretch it. 
oee [108]3 years ago
7 0
His hypothesis could be: A narrow rubber band is easier to stretch than a wider rubber band.
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Reaction follows frieldel-craft alkylation mechanism

Explanation:

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For the reaction A +B+ C D E, the initial reaction rate was measured for various initial concentrations of reactants. The follow
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Answer:

Rate constant of the reaction is 3.3\times 10^{-3} M^{-2} s^{-1}.

Explanation:

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Let the balanced reaction be ;

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Expression of rate law of the reaction will be written as:

R=k[A]^a[B]^b[C]^c

Rate(R) of the reaction in trail 1 ,when :

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R=9.0\times 10^{-5} M/s

9.0\times 10^{-5} M/s=k[0.30 M]^a[0.30 M]^b[0.30 M]^c...[1]

Rate(R) of the reaction in trail 2 ,when :

[A]=0.30 M,[B]=0.30 M,[C]=0.90 M

R=2.7\times 10^{-4} M/s

2.7\times 10^{-4} M/s=k[0.30 M]^a[0.30 M]^b[0.90 M]^c...[2]

Rate(R) of the reaction in trail 3 ,when :

[A]=0.60 M,[B]=0.30 M,[C]=0.30 M

R=3.6\times 10^{-4} M/s

3.6\times 10^{-4} M/s=k[0.60 M]^a[0.30 M]^b[0.30 M]^c...[3]

Rate(R) of the reaction in trail 4 ,when :

[A]=0.60 M,[B]=0.60 M,[C]=0.30 M

R=3.6\times 10^{-4} M/s

3.6\times 10^{-4} M/s=k[0.60 M]^a[0.60 M]^b[0.30 M]^c...[4]

By [1] ÷ [2], we get value of c ;

c = 1

By [3] ÷ [4], we get value of b ;

b = 0

By [2] ÷ [3], we get value of a ;

a = 2

Rate law of reaction is :

R=k[A]^2[B]^0[C]^1

Rate constant of the reaction = k

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k=\frac{9.0\times 10^{-5} M/s}{[0.30 M]^2[0.30 M]^0[0.30 M]^1}

k=3.3\times 10^{-3} M^{-2} s^{-1}

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3 years ago
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