Question

10. What is the other name of chemical change?
11. Why is the quantity of water in a pan decreas

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Answer 1

Answer:

ANSWER OF 10 QUESTIONS- Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. Some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. Understanding chemical changes is a major part of the science of chemistry.

When chemical reactions occur, the atoms are rearranged and the reaction is accompanied by an energy change as new products are generated. An example of a chemical change is the reaction between sodium and water to produce sodium hydroxide and hydrogen. So much energy is released that the hydrogen gas released spontaneously burns in the air. This is an example of a chemical change because the end products are chemically different from the substances before the chemical reaction

ANSWER 11 QUESTION- The quantity of water in a pan decreases when we keeps on heating it because water changes into its vapour.

Explanation:

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Answer 2

Answer:

chemical reacation

when is the quantity of water in apan decrease because when we put a pan with water on heating it changes into vapour