Question

classify each of the following as either a physical change or a chemical change.
process\ttype of change?
nacl(s)→nacl(ℓ)\tanswer
agno₃(aq)+kcl(aq)→agcl(s)+kno₃(aq)\tanswer
h₂o(ℓ)→h₂o(s)\tanswer
co₂(s)→co₂(g)\tanswer
3mg(s)+n₂(g)→mg₃n₂(s)\tanswer
hcl(aq)+naoh(aq)→nacl(aq)+h₂o(ℓ)\tanswer

Explanation:

1. Melting of NaCl is physical as no new substance forms.
2. Reaction of AgNO₃ and KCl is chemical with new compounds.
3. Freezing of water is physical.
4. Sublimation of CO₂ is physical.
5. Reaction of Mg and N₂ is chemical.
6. Acid - base reaction is chemical.

Answer:

1. Physical change
2. Chemical change
3. Physical change
4. Physical change
5. Chemical change
6. Chemical change