How are the chemical changes different from physical changes
They involve heat
They form new substances
They include shifts in the phase of matters
They are reversible
Chemical changes are different from physical changes in several ways:
1. Chemical changes involve heat: Chemical changes often involve the release or absorption of heat energy. This heat energy is needed to break existing chemical bonds and form new ones.
2. Chemical changes form new substances: In a chemical change, the original substances are transformed into new substances with different chemical properties. This can involve the rearrangement of atoms or the breaking and forming of chemical bonds.
3. Chemical changes include shifts in the phase of matter: While physical changes can also involve shifts in the phase of matter (such as changing from solid to liquid or gas), chemical changes often involve more significant changes in the properties of matter, including changes in density, color, odor, solubility, and reactivity.
4. Chemical changes are often irreversible: Unlike physical changes, which are typically reversible, chemical changes are often irreversible. Once a chemical change occurs and new substances are formed, it is usually not possible to reverse the process and return to the original substances. Some chemical changes, however, can be reversed under specific conditions (such as through chemical reactions).