Cooking can be both a physical and chemical change. For example, mashing up potatoes is a physical change, but baking a cake is a chemical change. More »

Physical changes do not produce new substances, but chemical changes do produce new substances. A physical change is concerned with states of matter. Melting, vaporization, freezing, sublimation and condensation are phys... More »

Some examples of physical change include ice melting, alcohol evaporating, iron rusting and salt water. A physical change is said to occur when something changes form but keeps the same chemical composition. More »

No, the rusting of iron is a chemical change because it is two substances reacting together to make a new substance. When iron rusts, iron molecules react with oxygen molecules to make a compound called iron oxide. Rusti... More »

The souring of milk is classified as a chemical change because it results in the production of sour-tasting lactic acid. Both physical and chemical changes closely relate to physical and chemical properties. More »

Because the process during digestion causes food to become a new substance, digestion is a chemical change. A physical change occurs when a subject changes its shape, size or state. More »

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Density is a physical property because its measurement or observation does not alter the chemical composition of a substance. Other physical properties include color, texture, melting point and volume. When a chemical pr... More »