H2SO4 + 2KOH --> K2SO4 + 2H2O
A physical change is when there is an alteration to the material but does not affect at the molecular level. An example of a physical change would be cutting, crushing, freezing, and boiling a material object.
You can think like this, Velocity is speed with a direction. When you say, the car was moving at the speed of 20 kilometers per hour, that's speed. But if you say, the car was moving at the speed of 20 kilometer per hour to the east. That's velocity, because you also stated the direction of the car.
