grass grows on a lawn. this is a physical change this is a chemical change a sugar cube is ground up. this…

grass grows on a lawn. this is a physical change this is a chemical change a sugar cube is ground up. this is a physical change this is a chemical change ice melts. this is a physical change this is a chemical change

grass grows on a lawn. this is a physical change this is a chemical change a sugar cube is ground up. this is a physical change this is a chemical change ice melts. this is a physical change this is a chemical change

Answer

Brief Explanations:

  1. Grass growing on a lawn involves biochemical processes like photosynthesis, respiration etc. where new substances are formed at the cellular - molecular level. So it is a chemical change.
  2. Grinding a sugar cube only changes its physical form (from a cube to powder), without changing its chemical composition (it is still sucrose). So it is a physical change.
  3. Melting ice changes its state from solid to liquid, but the chemical substance remains water ($H_2O$). So it is a physical change.

Answer:

  1. This is a CHEMICAL change
  2. This is a PHYSICAL change
  3. This is a PHYSICAL change