what is an example of a physical change?\n having less ash than the paper that was burned to form it\n ice…

what is an example of a physical change?\n having less ash than the paper that was burned to form it\n ice forming and then melting back into water\n rust having a different identity than the iron it forms on\n the irreversible reaction of vinegar and baking soda

what is an example of a physical change?\n having less ash than the paper that was burned to form it\n ice forming and then melting back into water\n rust having a different identity than the iron it forms on\n the irreversible reaction of vinegar and baking soda

Answer

Answer:

B. ice forming and then melting back into water

Explanation:

Step1: Define physical change

A physical change is a change in which the substance's state or appearance changes, but its chemical composition remains the same.

Step2: Analyze each option

  • Option A: Burning paper is a chemical change as new substances (ash) are formed with different chemical properties.
  • Option B: Ice - water transformation is a physical change. Water changes between solid (ice) and liquid states without changing its chemical composition ($H_2O$).
  • Option C: Rusting is a chemical change. Iron reacts with oxygen and moisture to form iron oxide (rust), a new substance.
  • Option D: The reaction between vinegar and baking soda is a chemical change as carbon - dioxide gas and other new substances are produced.