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Worksheet about Physical and chemical changes part 3 | ||
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| Subject: Physics | ||
| 4th Grade | ||
| Term 1 | ||
| Year: 2023/2024 | ||
| Size: 269.1KB | ||
| Number of clicks: 123 | ||
| Publish date:November 11, 2023 | ||
| Added by: Eman | ||
| Last download date: 2024-09-04 14:16:56 | ||
| Updated by: Eman9966 on 2023-11-12 03:10:04 | By: theodor Viviana Merino | |
| File info: Physical changes and chemical changes Physical changes are defined as changes that do not lead to a change in the composition of the underlying material. For example, if you fold a sheet of paper, you change its physical form, but you do not change its basic structure. Chemical changes are defined as changes that lead to a change in the composition of the basic substance. For example, if you burn a piece of wood, you change its basic composition, turning it into ash and carbon dioxide. Examples of physical changes Dissolution: When sugar is dissolved in water, the sugar forms a solution, but its basic composition does not change. Heating: When you heat water, it turns into steam, but its basic composition does not change. Cooling: When water is cooled, it turns into ice, but its basic composition does not change. Examples of chemical changes Combustion: When wood burns, it turns into ash and carbon dioxide. Chemical Reactions: When an acid reacts with a base, they form a salt and water. Chemical decomposition: When food breaks down, it breaks down into simpler substances. The difference between physical changes and chemical changes The difference between physical changes and chemical changes can be summarized in the following table: PropertyPhysical changeChemical changeBasic structureDoes not changeChangePhysical propertiesMay changeMay changeChemical propertiesDoes not changeChangeActivation energyDoes not require a large activation energyRequires a large activation energyIgnoranceCan only be reversed by changes in physical conditionsCan be reversed by changes in physical or chemical conditions The importance of physical changes and chemical changes Physical changes and chemical changes play an important role in our daily life. For example, we use physical changes in many daily activities, such as cooking, washing, and cleaning. We use chemical changes in many industries, such as manufacturing and medicine. | ||
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