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.
Among the given options, the one that describe chemical changes of the substance 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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