Chemical properties are the properties of substances in chemical changes.If the chemical commonness of the substance category:acidic、alkalinity、Oxidizability、Reducibility、thermal stabilityAnd some other features.Chemical properties and chemical changes are inherent characteristics of any substance, such asoxygenThis substance hasCombustibilityIs its chemical property;At the same time, oxygen can react with hydrogen to produce water, which is its chemical property.Any substance is distinguished from other substances by its various chemical properties and chemical changes;Chemical property is the relative stationarity of matter, and chemical change is the relative mobility of matter.
For example, carbon is generated by combustion in aircarbon dioxide；Reaction of hydrochloric acid and sodium hydroxidesodium chlorideAnd water;heatingKClOthreeWhen melting, it can rekindle the wood with Mars, indicating that KClOthreeWhen heated to a higher temperature, it can be releasedOtwo。So KClOthreeWith thermal decomposition to produce OtwoChemical properties of.Chemical properties are characterized by the disappearance of the original substance after the property of the substance is measured.For example, people can use combustion method to measure whether the material is combustible, and can use heating to see whether it decomposes to measure the stability of the material.The oxidability, reducibility and commonness of all kinds of substances in chemical reaction are all chemical properties.[1]
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Chemical properties: the properties of substances in chemical changes are called chemical properties.
Chemical change: when a substance changes, new substances are formed. This change is called chemical change, also called chemical reaction.
We should pay attention to the difference between chemical change and chemical property. Change is a process, and property belongs to the category of ability;For example, candle burning is the reaction of paraffin and oxygen, generating water and carbon dioxide, and chemical changes;This change proves that the candle can burn, which is the chemical property of paraffin.The chemical properties of a substance are determined by its structure, and the structure of a substance can be reflected by its chemical properties.The use of a substance depends on its nature.Chemical changes andphysical propertyThe difference between the two concepts.If the tungsten wire in the bulb emits light and heats when it is powered onphysical changeThrough this changeTungsten It has the physical properties of being conductive, high melting point and not easy to melt.People can easily identify and apply substances when they have mastered their physical properties.For example, aluminum and copper can be identified according to their different colors and densities.But according to their excellentConductivityThey are made into wires to transmit current.
The chemical properties and chemical changes of substances generate other substances when they change. This change is called chemical change, also called chemical reaction.
Chemical property and chemical change are two different concepts. Property is the property of matter and the internal cause of change. Property determines change;The change is the concrete manifestation of the nature, and the chemical nature can only be shown in the chemical change.For example,alcoholIt is flammable, so the chemical change of alcohol combustion can occur when alcohol is ignited;The flammability (chemical property) of alcohol is a conclusion drawn from countless alcohol combustion phenomena.[1]
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Essential difference: chemical properties are shown in the process of chemical change;The properties shown in the process of physical change are physical properties.
Iron rusting
Common chemical changes: rust of iron, festival fireworks, acid-base neutralization, etc.
Water freezes into ice
Common physical changes: solid ice melts into water when heated, and liquid water evaporates into steam;Water vapor condenses into water and gasoline volatilizes.[1]
Basic characteristics
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Chemical properties are characterized by the disappearance of the original substance after the property of the substance is measured.For example, people can use combustion method to measure whether the material is combustible, and can use heating to see whether it decomposes to measure the stability of the material.The oxidability, reducibilityGeneralAnd so on, all belong to chemical properties.
Chemical properties and chemical changes are inherent characteristics of any substance, such asoxygenThe chemical property of this material is combustion supporting;At the same time, oxygen can react with hydrogen to produce water, which is its chemical property.Any substance distinguishes itself from other substances through its various chemical properties and chemical changes;Chemical property is the relative stationarity of matter, and chemical change is the relative mobility of matter.
Molecules are the smallest particles that maintain the chemical properties of substances. For example, when steamed bread encounters solid iodine, iodine solution and iodine vapor, it will turn blue.Oxygen is a molecule, but oxygen has properties that oxygen atoms do not have.[1]
