Question

​E. Answer the following.

​1. Differentiate between (two points each)

a. Combination and Decomposition reaction.

b. Physical and chemical changes

2. Explain neutralisation reaction with an example.

3. Give two differences between an element and a compound, using suitable examples.

4. Give chemical symbols of these elements

Potassium ——, Iron——, Calcium———, Chlorine———,Silver——-.

5. Give the symbol of these ions and write their charges

Name. Symbol with charge

Sulphate

​Nitrate

Oxide

Chloride

Magnesium

​ Copper

IT IS HUGE BRUH

Answer 1

Answer:

b. physical change

1. no new substance is formed
2. original substance can be obtained easily
3. it is a permanent change

chemical change

1. new substance are formed
2. original substance cannot be obtained easily
3. it is a temporary change

2. the reaction between an acid and a base to give salt and water is known as neutralization reaction

• example - Hcl+ NaOH--Nacl +H2o

Answer 2

Answer:

Combination reaction:-

1. Two elements combine together to form a single compound.
2. here two or more then two reactant and one single product.

Decomposition reaction:-

1. One Compound break down into two ar more than two single substance.
2. here one reactant and two or more then two products.