Chemistry, 01.08.2019 06:10 amykookie24

1. write the reaction rate expressions for the following reactions in terms of the disappearance of the reactants and the appearance of products: (6 points) a. h2(g) + i2(g) → 2hi(g) b. 5br–(aq) + bro3–(aq) + 6h+(aq) → 3br2(aq) + 3h2o(l)

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Answer from: kylahnicolewebb

The expressions are written below.

Explanation:

The rate of reaction is defined as the change in the concentration of any one of the reactants or products per unit time. For the general reaction:

$rR\rightarrow pP$

Expression for the rate of reaction is given as:

$\text{Rate of reaction}=\frac{\text{Decrease in the concentration of a reactant R}}{\text{Time interval}}$

Or,

$\text{Rate of reaction}=\frac{\text{Increase in the concentration of a product P}}{\text{Time interval}}$

Thus,

$\text{Rate of reaction}=-\frac{1}{r}\frac{\Delta [R]}{\Delta t}=+\frac{1}{p}\frac{\Delta [P]}{\Delta t}$

For a:

The given chemical reaction follows:

$H_2(g)+I_2(g)\rightarrow 2HI(g)$

Rate of the reaction for disappearance of $H_2\text{ and }I_2$ is given as:

$\text{Rate of disappearance of }H_2=-\frac{\Delta [H_2]}{\Delta t}$

$\text{Rate of disappearance of }I_2=-\frac{\Delta [I_2]}{\Delta t}$

Rate of the reaction for appearance of is given as:

$\text{Rate of appearance of HI}=+\frac{1}{2} \frac{\Delta [HI]}{\Delta t}$

For b:

The given chemical reaction follows:

$5Br^-(aq.)+BrO_3^{-}(aq.)+6H^+(aq.)\rightarrow 3Br_2(aq.)+3H_2O(l)$

Rate of the reaction for disappearance of $Br^-,BrO_3^-\text{ and }H^+$ is given as:

$\text{Rate of disappearance of }Br^-=-\frac{1}{5} \frac{\Delta [Br^-]}{\Delta t}$

$\text{Rate of disappearance of }BrO_3^-=-\frac{\Delta [BrO_3^-]}{\Delta t}$

$\text{Rate of disappearance of }H^+=-\frac{1}{6} \frac{\Delta [H^+]}{\Delta t}$

Rate of the reaction for appearance of $Br_2\text{ and }H_2O$ is given as:

$\text{Rate of appearance of }Br_2=+\frac{1}{3} \frac{\Delta [Br_2]}{\Delta t}$

$\text{Rate of appearance of }H_2O=+\frac{1}{3} \frac{\Delta [H_2O]}{\Delta t}$

Hence, the expressions are given above.

Answer from: Quest

ur answer would be b hope i let me know if it is right

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:

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