Question

Solve the crossword puzzle. Hints are given below.

Across

6. The substance which takes part in a chemical reaction.

7. The substances that are formed as a result of a chemical reaction.

9. Double displacement are _____ in nature.

10. Only a single substance is formed as a result of _____ reaction.

11. A brown substance with the chemical formula ${Fe}_{2} O_{3} . {xH}_{2} O$ .

12. Formation of nitric oxide from nitrogen and oxygen at $3000 ° C$ is an example of _____ reaction.

14. Obtained on heating ${CaCO}_{3}$ .

15. BHT is an _____.

Down

1. A chemical _____ is a symbolic representation of a chemical change.

2. Digestion of food in our body is an example of _____ reaction.

4. A process that involves the gain of oxygen or the loss of hydrogen.

5. A process that involves the gain of hydrogen or loss of oxygen.

8. The oxidation of fats and oils in food results in an unpleasant smell and taste.

13. A chemical equation that contains an equal number of atoms of each element on both sides of the equation.

Accepted Answer

A chemical equation is a symbolic representation of a chemical change. The total mass is always conserved in a chemical reaction. The digestion of food in our body is an example of a decomposition reaction. Decomposition reactions involve the conversion of a single compound into two or more simpler substances.

A process that involves the gain of oxygen or the loss of hydrogen is called oxidation. Oxidation is the loss of electrons or an increase in the oxidation state of an atom, an ion, or of certain atoms in a molecule. A process that involves the gain of hydrogen or loss of oxygen is called reduction. Reduction is the gain of electrons or a decrease in the oxidation state by a molecule, atom, or ion.

The substance which takes part in a chemical reaction is known as a reactant. For example, water is the product of the reaction between hydrogen and oxygen. The substances that are formed as a result of a chemical reaction is known as products.

The oxidation of fats and oils in food results in an unpleasant smell and taste is known as rancidity. Double displacements are ionic in nature. Only a single substance is formed as a result of a combination reaction. A combination reaction is also known as a synthesis reaction.

A brown substance with the chemical formula ${Fe}_{2} O_{3} . {xH}_{2} O$ is called rust. The formation of nitric oxide from nitrogen and oxygen at $3000 ° C$ is an example of an endothermic reaction. Endothermic reactions are accompanied by the absorption of heat.

A chemical equation that contains an equal number of atoms of each element on both sides of the equation is known as a balanced equation. It follows the law of conservation of mass.

Quick lime is obtained on heating ${CaCO}_{3}$ . It is an example of a thermal decomposition reaction. BHT is an antioxidant. The substances that prevent oxidation are called antioxidants. It is used to prevent rancidity.

Important Questions on Chemical Reactions and Equations

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