Answer:
Step-by-step explanation:
When particles of different substances are combined, they may interact with one another in various ways, including bonding, reactions, and phase transitions. At a particle level, these interactions may involve the transfer or sharing of electrons, the breaking and forming of chemical bonds, or the rearrangement of atoms or molecules. These processes can lead to the formation of new substances with different physical and chemical properties than the original substances. For example, when two atoms of hydrogen combine with one atom of oxygen, they form a molecule of water, which has different properties than the hydrogen and oxygen atoms on their own.