Question

write a chemical equation to show change in state during chemical change. ​

Answer 1

Answer:

Question



Give one example each of a chemical reaction characterised by

1.Evolution of a gas. 

2.Change in colour. 

3.Formation of a precipitate. 

4.Change in temperature. 

5.Change in state. 

Answer 2

Explanation:

Answer -

1) Evolution of a gas

Zn(s) + H2SO4(aq) -> H2(g)

2) Change in colour

Pb(NO3)2(aq) + 2KI --> PbI2(s) + 2KNO3(aq)

3) Formation of precipitate

BaCI2(aq) + Na2SO4(aq) -> BaSO4(s) + 2KNaCI(aq)

4) Change in temperature

Zn(s) + H2SO4 -> ZnSO4 + H2