Question

click on the butter, watch the animation and look at the before and after images for melting butter. what do you notice about the particles. is this a chemical or physical change? explain using evidence.

Explanation:

For "What do you notice about the particles":

When butter melts, particles (molecules) gain energy, move faster, and spread out. The arrangement changes from a closely - packed solid structure to a more disordered liquid structure, but the particles themselves don't change identity.

A physical change is a change in which no new substance is formed. When butter melts, it changes from solid to liquid but is still butter (same chemical composition, just different state).

In melting butter, the substance remains butter (no new substance, e.g., we can re - solidify the melted butter to get back the original - like solid butter). The change is in state (solid to liquid), which is a characteristic of physical change (only physical properties like state change, not chemical composition).

Answer:

When butter melts, the particles (molecules) move more freely, their arrangement becomes less ordered (from solid - like close packing to liquid - like more spread - out), and they gain kinetic energy (move faster), but the particle identity remains the same.

For "Is this a chemical or physical change?":