Question

1. Explain the difference between a stoichiometric reaction and a catalytic reaction, give one example for each that was not part of your experiments (be specific with a type of redox, combustion, or acid-base reaction).

2. What is the oxidation state of the metals in this redox reaction (Before and After)?

   1. 2KMnO4+3H2O2->2MnO2+2H2O+3O2+2KOH

3. What is a decomposition reaction? Name one that you have learned in 101L

4. For the following reaction, which species is reduced

   1. HCl(aq)+Zn(s)->H2(g)+ZnCl2(aq)

Answer 1

Stoichiometric reaction is one where the quantities of the reactants and products are such that all of the reactants are consumed and none remain after completion of the chemical reaction. Stoichiometry is useful for measuring chemical reactions such as those that occur in corrosion processes.

Stoichiometry is used to calculate the required quantities of chemical reactants and products using a balanced chemical equation. The reactants and products must remain in the same proportion.

Stoichiometry is based on the law of conservation of mass, which states that the total mass of the reactants are equal to the total mass of the products.

balanced equation is:

CH₄ + 2O₂→ CO₂ + 2H₂O

Here, one molecule of methane reacts with two molecules of oxygen gas to yield one molecule of carbon dioxide and two molecules of water. This particular chemical equation is an example of complete consumption i.e Stoichiometric reaction.

2.Catalytic Reaction.

Catalysis is the process of modifying a chemical reaction with the use of a catalyst.The process of increasing the rate of a chemical reaction by addition of substance ( catalyst )which is not consumed in the reaction and can continue to act repeatedly

2H_​​2O₂ -------^kMNO4-------> O₂ + 2H₂​​​​​​O

Hydrogen peroxide will decompose into water and oxygen gas. Two molecules of hydrogen peroxide will produce two molecules of water and one molecule of oxygen. A catalyst of potassium permanganate can be used to speed up this process. Adding potassium permanganate to the hydrogen peroxide will cause a reaction that produces a lot of heat, and water vapor will shoot out.

The oxidation number of manganese in KMnO4 is +7. Befor reaction and +4 after reaction..

Chemical decomposition is the breakdown of a single entity into two or more fragments, the chemical reaction in which two or more products are formed from a single reactant is called a decomposition reaction.

Example.-Hydrogen peroxide decompose to water and oxygen, and the breakdown of water to hydrogen and oxygen

In reaction of HCl and Zn,zink get oxidized and Hydrogen get reduced.