3 what makes a change a chemical change instead of a physical one? a the substance changes between solid…

3 what makes a change a chemical change instead of a physical one? a the substance changes between solid, liquid, and gas b the atoms rearrange to form a new substance c the size or shape of the substance changes d the composition of the substance stays the same

3 what makes a change a chemical change instead of a physical one? a the substance changes between solid, liquid, and gas b the atoms rearrange to form a new substance c the size or shape of the substance changes d the composition of the substance stays the same

Answer

Brief Explanations:

  • Option A: Changes between solid, liquid, and gas (phase changes) are physical changes. For example, water boiling (liquid to gas) is a physical change as the chemical composition ((H_2O)) remains the same.
  • Option B: In a chemical change, atoms rearrange to form new substances. For instance, when hydrogen ((H_2)) and oxygen ((O_2)) react to form water ((H_2O)), new chemical bonds are formed and a new substance is created.
  • Option C: Changes in size or shape (e.g., cutting a piece of paper) are physical changes. The chemical composition of the paper (mainly cellulose) does not change.
  • Option D: If the composition of a substance stays the same, it is a physical change. Like dissolving salt ((NaCl)) in water - the (NaCl) can be recovered by evaporation, showing no new substance is formed.

Answer:

B. The atoms rearrange to form a new substance