Question

Q3. True False:
1. The number of atoms of each element is conserved in any chemical reaction.
2. Oxidation is the loss of electrons from a substance.
3. Reduction is the gain of electrons by a substance.
4. A complete chemical equation represents the reactants, products and their physical states symbolically.
5. A magnesium ribbon burns with a dazzling flame in air (oxygen) and changes into a white substance, magnesium oxide.
6. Rusting is a double decomposition reaction.
7. The reaction between nitrogen and hydrogen to give ammonia is an example of a combination reaction.
8. Action of heat on ferrous sulphate is an example of decomposition reaction.
9. The formation of Na+ and CI- ions from sodium and chlorine is an example of a redox reaction.
10. Rusting is a slow process.​

Answer 1

Answer:

1. True

2.True

3.True

4.True

5.True

6.False rusting is a oxidation reaction

7.True

8.True

9.True

10.True

Answer 2

The following statements are as follows:

1. The number of atoms of each element is conserved in any chemical reaction.

• The statement is true.
• In all chemical equations, the law of conservation of mass applies.
• This means that the number of atoms present in the products is conserved in relation to the number of atoms in the reactants.

2. Oxidation is the loss of electrons from a substance.

• The statement is true.
• The loss of electrons is called oxidation.

3. Reduction is the gain of electrons by a substance.

• The statement is true.
• The gain of electrons is called reduction.

4. A complete chemical equation represents the reactants, products, and their physical states symbolically.

• The statement is true.
• In a chemical reaction, the physical state of reactants and products can be shown by writing (s) for solid, (l) for liquid, (aq) for an aqueous solution, and (g) for a gaseous substance after its formula or symbol.

5. A magnesium ribbon burns with a dazzling flame in the air (oxygen) and changes into a white substance, magnesium oxide.

• The statement is true.
• A new substance called magnesium oxide is formed as a result of the reaction between magnesium and oxygen in the air.

6. Rusting is a double decomposition reaction.

• The statement is false.
• The corrosion of iron is referred to as rusting.
• It is an oxidation reaction because the oxidation of Fe increases from 0 to +3.

7. The reaction between nitrogen and hydrogen to give ammonia is an example of a combination reaction.

• The statement is true.
• Two elements combine to form a compound.

8. Action of heat on ferrous sulfate is an example of a decomposition reaction.

• The statement is true.
• When heated, $FeSO_{4}$ decomposes into ferric oxide, sulfur dioxide, and sulfur trioxide, which is an example of a decomposition reaction.

9. The formation of Na+ and CI- ions from sodium and chlorine is an example of a redox reaction.

• The statement is true.
• Sodium is oxidized in the reaction of sodium with chlorine. The element gaining electrons is diminished. Chlorine is reduced in this reaction.

10. Rusting is a slow process.​

• The statement is true.
• Rusting iron is a very slow process that involves the formation of hydrated oxide $Fe(OH)_{3}$ in the presence of water, oxygen, and an electrolyte.

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