Is it possible to have a chemical change without a physical change?

Physical and Chemical change?

• I have a few HW questions that im too lazy to do myself so plz help here they are!: The steel wool turned the black pot a shiny, silver color Chemical or Physical change? Lightning flashes across the sky Physical or Chemical? The piece of lemon turned the tea cloudy Physical or Chemical? Spilled Gasoline dried but left a bad odor in the room Physical or Chemical? The gravy in the fridge gelled Physical or Chemical? Thxs also if ya can tell me why THXSSSSSSSSSSSSSSS

• Answer:

  1 Physical, it is the friction that removes the dullness and not the cleanser. 2 Chenical and Physical athe atomic weight of the clouds change due to barometric pressure and the lightnig results as a tranference of the combination of the two sending energy from a greater pressure to a lesser presure area. 3 Chemical The acid in the lemon clouds the water and the elements combine. 4 Chemical the gas mixed with the oxygen and the heat of the room to turn liquid into gas. 5. Biological or Biochemical. The the temperature chilled the bacteria in the flour/yeast products in the gravy and they turned liquid to solid as the oxygen as the product absorbed the remained of the hydrogen from the water in the mixture to try an preserve the bacteria. You can call this both.