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(一)物质的变化与构成1.物质变化与性质没有生成其他物质的变化叫物理变化;生成其他物质的变化叫化学变化,又叫化学反应。判断某变化是物理变化还是化学变化的唯一标准是看变化中是否生成了其他物质。
(1) Change and composition of materials 1. Changes and properties of materials No changes in other materials are called physical changes; changes in other materials are called chemical changes, also called chemical reactions. The only criterion for determining whether a change is a physical or chemical change is to see if other substances are produced in the change.