Chemistry, asked by sabinatariqueraza063, 3 months ago

Give a balanced chemical equation for each of the following:
1. Combination reaction
2. Decomposition reaction
3. Displacement reaction
4. Double displacement reaction
5. Photochemical reaction
6. Calcination
7. Roasting
8. Precipitation reaction
9. Neutralization reaction
10. Enzyme reaction
11. Positive catalytic reaction
12. Negative catalytic reaction

Answers

Answered by shanahajimagmailcom

Answer:

answer for first question is in the picture

2.)A decomposition reaction occurs when one reactant breaks down into two or more products. This can be represented by the general equation: AB → A + B. Examples of decomposition reactions include the breakdown of hydrogen peroxide to water and oxygen, and the breakdown of water to hydrogen and oxygen.

chemical equation:Water splitting is the chemical reaction in which water is broken down into oxygen and hydrogen: 2 H2O → 2 H2 + O.

3.refer the image

Attachments:

Answered by ltzSweetAngel

1. Combination Reaction :

A chemical reaction in which two or more substances combine to form a single product is called a combination reaction or synthesis.

When iron and sulphur are heated together, they combine to form a single product, iron sulphide.

2Fe(s) + S(s) → FeS (s)

Iron Sulphur Iron sulphide

2. Decomposition Reaction :

A chemical reaction in which a single compound splits into two or more simple substances is called a decomposition reaction.

When mercuric oxide is heated in a crucible, the orange-red powder begins to darken and a silver mirror begins to deposit on the cooler parts of the crucible. This is mercury. If we hold a glowing splint near the crucible, it can relight. This shows that the gas evolved during the reaction is oxygen.

2HgO(s) 2Hg(s) + O2 ↑

Mercuric oxide Mercury Oxygen

3.Displacement Reaction:

Reactions in which the more reactive element displaces the less reactive element from its compound are called displacement reactions.

Zinc displaces copper in copper sulphate to form zinc sulphate.

Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s)

Zinc Copper sulphate Zinc sulphate

4.Double Displacement Reaction:

A type of chemical change in which two compounds in a solution react to form two new compounds by the mutual exchange of radicals. Usually, a solid is formed as a result of the reaction.

NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)

Sodium Hydrochloric Sodium Water

hydroxide acid chloride

5. Redox Reaction:

The oxidation and reduction reactions occur together. When oxidation of one substance occurs, reduction of the other substance also takes place. Such reactions are called redox reactions. In the name ‘redox’, the term ’red’stands for reduction and ’ox’ stands for oxidation.

Consider the redox reaction between hydrogen sulphide and chlorine.

In the reaction between hydrogen sulphide and chlorine, the products formed are hydrogen chloride and sulphur.

H2S + Cl2 → 2HCl + S

Hydrogen Chlorine Hydrogen Sulphur

sulphide chloride

Answered by | 7th Apr, 2014, 09:24: AM