Velocity is explained as the *speed and *direction something might move. Speed means moving and Direction means a certain way (not stationary.)
Hope this helps!
Answer:
Al2O3 + H2SO4 = Al2(SO4)3 + H2O
Explanation:
It is a physical change because you can not put it back like it was
If a piece of charcoal is taken and set on fire it will evolve CO2 and heat. Charcoal is solid but carbon dioxide is gaseous. This is an example of change of state and evolve of heat during chemical reaction.
