Question

Make a crossword puzzle and solve it with the help of following clues.

ACROSS
2. An example of a decomposition reaction.

4. In a chemical reaction atoms are.

6. Another name for a combination reaction.

8. Energy is transferred from the surroundings to the reactants in this type of reaction.

9. Substances that takes oxygen.

10. An example of an exothermic reaction.

DOWN

1. An example of an endothermic reaction.

3. A chemical equation is balanced by changing or adding _____.

5. In this reaction energy is transferred from the reactant to the surroundings.

7. When a chemical reaction and its reverse reaction are occurring at the same time and at the same rate.

Accepted Answer

ACROSS:

2. An example of a decomposition reaction is digestion in which complex compounds are broken into simple substances. The starch decomposes into simple sugars and protein decomposes into amino acids.

4. In a chemical reaction atoms are rearranged. The original substances are called reactants and new substances formed are known as products in a chemical reaction.

6. Another name for a combination reaction is synthesis reaction because in these reactions, new substances are synthesised. When the bond formed between the elements, heat is released.

8. Energy is transferred from the surroundings to the reactants in the endothermic reaction.

9. Substances that take oxygen are said to be oxidized.

10. An example of an exothermic reaction is respiration as it produces heat energy. Respiration occurs in the cells and is accompanied by the combustion of glucose producing carbon dioxide and water.

DOWN:

1. An example of endothermic reaction is photosynthesis. Carbon dioxide and water combine to form glucose and oxygen.

3. A chemical equation is balanced by changing or adding its coefficients. We make trials to balance the given equation by using the smallest whole number coefficient.

5. In exothermic reaction, energy is transferred from the reactant to the surroundings. Energy is released in the form of heat.

7. When a chemical reaction and its reverse reaction are occurring at the same time and at the same rate is known as equilibrium reaction.

Important Questions on Chemical Reactions and Equations

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