Chemistry, 11.03.2020 22:18 kaylag8242p2qj2e

The reaction has an initial rate of 0.0300 M/s.

A+B YIELDS C+D rate=k[A][B]^2

What will the initial rate be if [A] is halved and [B] is tripled? (answer) M/s

What will the initial rate be if [A] is tripled and [B] is halved? answer M/s

Answers: 2

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Answers

Answer from: alleydog38511

The initial rate if [A] is halved and [B] is tripled is 0.135 $\frac{m}{s}$

The initial rate if [A] is tripled and [B] is halved is 0.0225 $\frac{m}{s}$

Explanation:

You have:

A + B → C + Drate=k*[A]*[B]² and being the initial rate= 0.0300 m/s → 0.0300 m/s=k*[A]*[B]²

If [A] is halved and [B] is tripled, the new concentrations are:

[A]=[A]÷2[B]=[B]*3

Replacing these new concentrations in the velocity expression:

$rate=k*\frac{[A]}{2} *(3*[B])^{2}$

$rate =k*\frac{[A]}{2} *9*[B]^{2}$

$rate=\frac{9}{2}* k*[A] *[B]^{2}$

Replacing k*[A]*[B]² with 0.0300 m/s:

$rate=\frac{9}2} *0.0300 \frac{m}{s}$

$rate=0.135 \frac{m}{s}$

The initial rate if [A] is halved and [B] is tripled is 0.135 $\frac{m}{s}$

If [A] is tripled and [B] is halved, the new concentrations are:

[A]=[A]*3[B]=[B]÷2

Replacing these new concentrations in the velocity expression:

$rate=k*[A]*3 *(\frac{[B]}{2} )^{2}$

$rate=k*[A]*3*\frac{[B]^{2}}{4}$

$rate =\frac{3}{4}* k*[A] *[B]^{2}$

Replacing k*[A]*[B]² with 0.0300 m/s:

$rate =\frac{3}{4}* 0.0300 \frac{m}{s}$

$rate=0.0225 \frac{m}{s}$

The initial rate if [A] is tripled and [B] is halved is 0.0225 $\frac{m}{s}$

Answer from: Quest

water molecules stay close to each other through cohesion, the collective action of hydrogen bonds between water molecules. cohesion plants draw water upwards from the root through the stem's transport tubes (xylem) to the leaf. this transport occurs even in large trees and against gravity. transpiration, evaporation of water from plant leaves, creates a tension on water molecules being pulled up from the stem and roots.

water also has high (the attraction of one substance to another) properties because of its polar nature. adhesion of water molecules to plant cell walls counteract gravity while water is transported from roots to leaves.

water exhibits a very high surface tension when compared to other liquids. surface tension is a property of a liquid that holds the surface together and allows it to resist an external force. by capillary action, the water forms concave menisci inside the pores. the high surface tension of water pulls the concavity outwards, generating enough force to lift water from the roots to the leaves of plants.

thus, cohesion, along with adhesion and surface tension creates a capillary action that keeps water molecules interacting and moving through the plants out to the leaf cells.

therefore, option d) is the correct answer.

explanation:

Answer from: Quest

D-no effect on the rate

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The reaction has an initial rate of 0.0300 M/s.

A+B YIELDS C+D rate=k[A][B]^2

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