Question

write about the effect of concentration of the reactions

Answer 1

Explanation:

For many reactions involving liquids or gases, increasing the concentration of the reactants increases the rate of reaction. In a few cases, increasing the concentration of one of the reactants may have little noticeable effect of the rate

Answer 2

Answer:

• For many reactions involving liquids or gases, increasing the concentration of the reactants increases the rate of reaction. In a few cases, increasing the concentration of one of the reactants may have little noticeable effect of the rate

      Some examples

• Changing the concentration of a gas is achieved by changing its pressure.
• Zinc and hydrochloric acid  
• In the lab, zinc granules react fairly slowly with dilute hydrochloric acid, but much faster if the acid is concentrated.
• The catalytic decomposition of hydrogen peroxide
• Solid manganese(IV) oxide is often used as a catalyst in this reaction. Oxygen is given off much faster if the hydrogen peroxide is concentrated than if it is dilute.
• The reaction between sodium thiosulphate solution and hydrochloric acid  
• This is a reaction which is often used to explore the relationship between concentration and rate of reaction in introductory courses (like GCSE). When a dilute acid is added to sodium thiosulphate solution, a pale yellow precipitate of sulphur is formed.
• As the sodium thiosulphate solution is diluted more and more, the precipitate takes longer and longer to form.