When hydrogen and chlorine gas react, they form hydrochloric acid.
H2(g) + Cl2(g) → 2HCl(l) Regards!
Does the physical state of a substance always change during a chemical change? Give one example in favour and one example against the statement with proper reasoning.
Illustrate an activity showing a chemical reaction and state your observation. Give suitable examples in support of your answer.
What is a chemical change? Give two examples. [2 MARKS]