pls send me NCERT class 10...Chemical Reactions and Equations. (notes...plss) it's urgent
Answers
Explanation:
Chemical change – one or more new substances with new physical and chemical properties are formed.
Chemical Reactions and Equations-1
Here, when copper sulphate reacts with iron, two new substances, i.e., ferrous sulphate and copper are formed.
Chemical-Reactions-and-Equations-2
Physical change – change in colour or state occurs but no new substance is formed.
Example: Water changes to steam on boiling but no new substance is formed(Even though steam and water look different when they are made to react with a piece of Na, they react the same way and give the exact same products). This involves only a change in state (liquid to vapour).
To know more about Physical and Chemical Changes, visit here.
Observations that help determine a chemical reaction
A chemical reaction can be determined with the help of any of the following observations:
a) Evolution of a gas
Answer:
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