WHICH ONE IS A CHEMICSL CHANGE
5 points
Combustion, reacts with acid, water and air
Cut apple, heat changes, alcohol evaporates, ice melts
Tarnishes, rust, ph, rots, food digest
Melting point, hardness, luster, odor
Combustion, reacts with acid, water, and air is a chemical change.
Tarnishes, rust, pH, rots, and food digest are examples of chemical changes.
A chemical change refers to a process where one or more substances are converted into a different substance(s) with new properties. Let's examine each of the given options to identify the one that represents a chemical change:
1. Combustion: Combustion is a chemical change because it involves a reaction between a substance and oxygen, resulting in the production of heat, light, and new chemical compounds.
2. Cut apple, heat changes, alcohol evaporates, ice melts: Cutting an apple, heating it, and ice melting are all examples of physical changes because the substances involved do not undergo a change in their chemical composition. Alcohol evaporating is also considered a physical change as it only involves a phase change from liquid to gas.
3. Tarnishes, rust, pH, rots, food digest: Tarnishing, rusting, changes in pH, rotting, and the digestion of food are all examples of chemical changes. Each of these processes involves a reaction that alters the composition or properties of the substances involved.
4. Melting point, hardness, luster, odor: These properties (melting point, hardness, luster, and odor) are all physical properties and not indicative of chemical changes. They describe the characteristics of a substance without any alteration to its chemical composition.
Based on the explanations given above, the option that represents a chemical change is: Tarnishes, rust, pH, rots, food digest.