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Matter is capable of undergoing changes, which are classified as either physical or chemical. Physical changes in matter are often reversible: An ice cube can melt into liquid water, and then the liquid water can be frozen back into an ice cube.
Matter can go through changes. Some changes to matter are physical. Other changes are chemical. The two kinds of changes are very different from each other. Physical changes can often be reversed. For example, think of an ice cube in a hot room. The ice will melt and become water. That water can then be refrozen. It can become ice again.
Chemical changes are very different from physical changes. A chemical change takes place when the composit ion of a substance is altered. This requires the breaking and forming of chemical bonds during a reaction.
Matter can change form through physical and chemical changes, but through any of these changes matter is conserved. The same amount of matter exists before and after the change—none is created or destroyed. This concept is called the Law of Conservation of Mass.
Matter is capable of undergoing changes, which are classified as either physical or chemical. Physical changes in matter are often reversible. For example, an ice cube can melt into liquid water, and then the liquid water can be refrozen into an ice cube.
Matter can change form through physical and chemical changes, but through any of these changes, matter is conserved. The same amount of matter exists before and after the change—none is created or destroyed. This concept is called the Law of Conservation of Mass.
Matter can change form through physical and chemical changes, but through any of these changes, matter is conserved. The same amount of matter exists before and after the change—none is created or destroyed. This concept is called the Law of Conservation of Mass.
In a physical change, a substance's physical properties may change. However, its chemical makeup does not. Water, for example, is made up of two hydrogen atoms and one oxygen atom. Water is the only known substance on Earth that exists naturally in three states. These are solid, liquid, and gas.
Matter can change form through physical and chemical changes. Still, through any of these changes, matter is conserved. That is, the same amount of matter exists before and after the change. None is created or destroyed. This concept is called the Law of Conservation of Mass.
According to the Big Bang theory, at the beginning of the universe, all matter erupted from a singularity, a hot, dense speck of matter. The most familiar forms of matter— elements and compounds —are made of up tiny particles called atoms. Atoms themselves are made up of even smaller bits of matter: protons, neutrons, and electrons.