chemical changes是化学变化。physical changes是物理变化。自然界有两种类型的变化,化学变化和物理变化.物理变化与化学变化的根本区别就在于物理变化没有新物质生成，而化学变化有。
Chemical changes are usually accompanied with heat exchanges. Chemical changes are permanent changes which are usually irreversible. Which of the following is always true when a substance undergoes a physical change ?
Many changes differentiate chemical and physical changes: Chemical changes alter the chemical makeup of substances, physical changes do not Physical changes maintain the chemical makeup of a substance but change its shape or state of matter Chemical changes may result in the formation of gases,...
The answer to whether dissolving salt (in this case, NH4Cl) in water is a physical change or a chemical change depends on what criteria one uses to define these changes. Many would say that it is a chemical change because the products of the reaction are chemically different from the react...
0 degree celcius or 32 F below, water freeze, above it melt. boiling point of water 100 degree celcius or 212 F how are physical and chemical changes similar? changes happen around us every day. both of them are changes on matter. ...
or removing heat(ACSSU046)Natural and processed materials have a range of physical properties; These properties can influence their use (ACSSU074) Solids, liquids and gases have different observable properties and behave in different ways(ACSSU077)Changes to materials can be reversible, such as ...
Chemical changes, or chemical reactions, are changes that result in the production of another substance. FLAMMABILITY: A material’s ability to BURN in the presence of OXYGEN REACTIVITY: How readily (easily) a substance combines chemically with other substances. ...
化学变化:Chemical changes 化学反应:Chemical reactions 是否有新物质生成: Whether new matters have formed 水的三态:The three states of water 物理变化主要是物质形状、大小、状态的变化:Physical changes mainly affect the shape, size and state of a matter/substance. ...
steam when it boils in a kettle. Bread dough rises and becomes a crusty loaf when it is baked. In some of these changes, new substances are formed or some substances seem to disappear completely. These changes are called chemical changes . Other changes to substances are physical changes .W...
chemical property A characteristic of a pure substance that describes its ability to change into different substances substance A single kind of matter that is pure and has a specific set of properties. physical properties the characteristics of a substance that can be observed or measured without ...