Question

Which of the following describe chemical(not physical) changes?

Answer 1

HERE IS THE COMPLETE QUESTION;

Which of the following describe chemical (not physical) changes?

a) a spoonful of table salt dissolves in a bowl of soup.

b) the growth of plants depends upon the sun's energy in a process called photosynthesis.

c) a flashlight beam slowly gets dimmer and finally goes out due to a dying battery.

d) the helium gas inside a balloon tends to leak out after a few hours.

e) frozen orange juice is reconstituted by adding water to it.

The correct statements that answer the question are;

• the growth of plants depends upon the sun's energy in a process called photosynthesis.

• a flashlight beam slowly gets dimmer and finally goes out due to a dying battery.

• Chemical changes can be regarded as one that takes place when  there is occurrence of chemical reactions

• The reaction in chemical change involve   formation of new chemical elements or formation of new  compounds .

• Physical changes can be regarded as changes that does  not lead to  formation of new chemical substances

• the growth of plants here can be regarded as chemical change this is because there is formation of new product, and the sun's energy  this process is as a result of  photosynthesis which is a chemical process

• When a  flashlight beam and started  gets dimmer and  then goes out, this is because of  dying battery is chemical process, the battery contains some chemical elements and there is chemical reaction going.

• When the helium gas that is inside a balloon  leak out, it is considered a physical process , no reaction has occurred.

Therefore, Chemical changes can be regarded as one that takes place when  there is occurrence of chemical reactions

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