physical change and chemical change
Answer (1)
A physical change is a change in the appearance or state of a substance without altering its chemical composition. Examples include changes in size, shape, phase (like melting or freezing), or texture. The substance remains the same at the molecular level.Example: Ice melting into water.A chemical change occurs when a substance transforms into a new substance with different chemical properties. This involves breaking and forming chemical bonds. Signs of chemical change include color change, gas production, temperature change, or formation of a precipitate.Example: Iron rusting when exposed to air and moisture.
