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Question
In a certain change, color of a substance changed. What reaction might this be?
In a certain change, color of a substance changed. What reaction might this be?
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Solution
The correct option is A Chemical combination
The changing of colour of a substance is not necessarily an indicator of
a chemical change. For example changing the colour of a metal does not
change its physical properties. However in a chemical reaction, a color
change is usually an indicator that a reaction is occuring.
The four signs that a chemical reaction has occured are:
- A change in colour
- A change in temperature
- formation of a gas
- formation of a precipitate.
The changing of colour of a substance is not necessarily an indicator of a chemical change. For example changing the colour of a metal does not change its physical properties. However in a chemical reaction, a color change is usually an indicator that a reaction is occuring.
The four signs that a chemical reaction has occured are:
- A change in colour
- A change in temperature
- formation of a gas
- formation of a precipitate.
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