Answer to Question #257775 in Inorganic Chemistry for shamsa

Question

Read extensively about the factors affecting rates of reactions, bearing in mind the rate equation, order of reaction, half-life of a reaction as well as activation energy and the Arrhenius equation. 2. If the rate of reaction doubles for every 10 °C rise in temperature, how much faster does the reaction proceed at 45 °C than at 25 °C? At 95 °C than at 25 °C?

Answer 1

There are four main factors that can affect the reaction rate of a chemical reaction:

1. Reactant concentration. Increasing the concentration of one or more reactants will often increase the rate of reaction. This occurs because a higher concentration of a reactant will lead to more collisions of that reactant in a specific time period.

2. Physical state of the reactants and surface area. If reactant molecules exist in different phases, as in a heterogeneous mixture, the rate of reaction will be limited by the surface area of the phases that are in contact. For example, if a solid metal reactant and gas reactant are mixed, only the molecules present on the surface of the metal are able to collide with the gas molecules. Therefore, increasing the surface area of the metal by pounding it flat or cutting it into many pieces will increase its reaction rate.

3. Temperature. An increase in temperature typically increases the rate of reaction. An increase in temperature will raise the average kinetic energy of the reactant molecules. Therefore, a greater proportion of molecules will have the minimum energy necessary for an effective collision (Figure. 17.5 “Temperature and Reaction Rate”).

4. Presence of a catalyst. A catalyst is a substance that accelerates a reaction by participating in it without being consumed. Catalysts provide an alternate reaction pathway to obtain products.

2.

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In October 2021

Answer to Question #91250 in Inorganic Chemistry for Agou Alier

Answers>Chemistry>Inorganic Chemistry

Question #91250

If the rate of reaction doubles for every 10 °C rise in temperature, how much faster does

the reaction proceed at 45 °C than at 25 °C? At 95 °C than at 25 °C?

2..

$$v2 = v1 \times \gamma ^{\frac{t2-t1}{10}}$$

According to the Vant-Hoff Rule, each time the temperature rises by 10 degrees Celsius, the reaction rate increases by 2 times, then for the first case it will increase by 4 times, and in the second case, by 14 times.

Answer:

1) 4 times

2) 14 times