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.
<em>The correct statements that answer the question are;</em>
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- 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
- <em>When a flashlight beam and started gets dimmer a</em>nd 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.
<em>Therefore, Chemical changes can be regarded as one that takes place when there is occurrence of chemical reactions </em>
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