Question

1. the particle diagram below represents four molecules of a substance. which particle diagram best represents this same substance after a physical change has taken place?

Explanation:

Step1: Recall physical change properties

A physical change does not alter the chemical composition of a substance, only the arrangement or state of the molecules. So the number and type of molecules (or particles) should remain the same, just their spacing or arrangement might change.

Step2: Analyze the original diagram

The original diagram has four molecules, each consisting of a black and a white particle (so each is a compound molecule, or a diatomic - like but with two different atoms? Wait, no, each molecule is a combination of a black and a white sphere, so each molecule is the same type. So we need a diagram with the same number of molecules (four) and each molecule has one black and one white sphere.

Looking at the options (even though not all are shown, but from the visible ones):

• The option with four molecules each having one black and one white sphere (the one with the grouped or spaced - out but same - type molecules) is the correct one. Because in physical change, the molecules themselves don't break apart (that would be chemical change). So the diagram that has four molecules, each with one black and one white atom (same as original) is the answer. Let's assume the option with four molecules (each black - white pair) is the correct one. For example, if one of the options has four molecules, each composed of one black and one white sphere (like the original but maybe spaced differently), that's the one.

Answer:

The particle diagram with four molecules, each consisting of one black and one white particle (same as the original in terms of molecular composition, just possibly different spacing/arrangement) represents the substance after a physical change. (Since the exact options' labels are not fully visible, but the key is the molecular composition remains the same: four molecules, each with one black and one white atom.)