tijuan mixed a solid and a liquid together in a beaker. he determined that a chemical change occurred. if…

tijuan mixed a solid and a liquid together in a beaker. he determined that a chemical change occurred. if his conclusion is correct, which substances could he have been observing and why? \n○ ice mixed into warm oil, because the change of state that occurred when the ice melted cannot be reversed \n○ baking soda mixed into vinegar, because the production of bubbles indicates that a new substance formed \n○ sugar mixed into hot water, because the disappearance of solid indicates that the chemical identity of the sugar changed \n○ sand mixed into water, because when sand was added the mass of the beaker increased

tijuan mixed a solid and a liquid together in a beaker. he determined that a chemical change occurred. if his conclusion is correct, which substances could he have been observing and why? \n○ ice mixed into warm oil, because the change of state that occurred when the ice melted cannot be reversed \n○ baking soda mixed into vinegar, because the production of bubbles indicates that a new substance formed \n○ sugar mixed into hot water, because the disappearance of solid indicates that the chemical identity of the sugar changed \n○ sand mixed into water, because when sand was added the mass of the beaker increased

Answer

Brief Explanations:

  • For the first option: Melting ice in oil is a physical change (state change, reversible by cooling), so it's incorrect.
  • Second option: Baking soda (sodium bicarbonate) and vinegar (acetic acid) react to form carbon dioxide bubbles (new substance, $CO_2$), indicating a chemical change.
  • Third option: Sugar dissolving in hot water is a physical change (sugar retains identity, reversible by evaporation), so incorrect.
  • Fourth option: Sand mixing with water is a physical mixture (no new substance, mass increase is just addition, not a chemical change), so incorrect.

Answer:

baking soda mixed into vinegar, because the production of bubbles indicates that a new substance formed