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Worksheet about physical and chemical changes | ||
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| Subject: Physics | ||
| 5th Grade | ||
| Term 1 | ||
| Year: 2023/2024 | ||
| Size: 253.2KB | ||
| Number of clicks: 138 | ||
| Publish date:November 08, 2023 | ||
| Added by: Eman | ||
| Last download date: 2024-09-02 18:48:15 | ||
| Updated by: Eman9966 on 2023-11-08 04:49:56 | By: theodor udangv11 | |
File info: Physical and chemical changes are two distinct types of transformations that can occur in matter. Here's a description of each: Physical Changes:Physical changes involve alterations in the physical properties of a substance without any change in its chemical composition. These changes affect the form, state, shape, or size of a substance, but the identity of the substance remains the same. Some key characteristics of physical changes include: 1. No Change in Chemical Composition: During a physical change, the atoms and molecules of the substance do not rearrange or bond differently. The substance retains its original chemical composition. 2. Reversibility: Most physical changes are reversible, meaning the substance can be changed back to its original state without undergoing any chemical reactions. 3. Conservation of Mass: The mass of the substance remains the same before and after the physical change. Examples of physical changes include changes in state (e.g., melting, freezing, boiling, condensation), changes in shape or size (e.g., cutting, bending, crushing), and mixing or separation of substances (e.g., dissolving, filtration). Chemical Changes:Chemical changes, also known as chemical reactions, involve the formation of new substances with different chemical properties. During a chemical change, the atoms and molecules of the substance rearrange and bond together in new ways, resulting in the formation of entirely different substances. Some characteristics of chemical changes include: 1. Formation of New Substances: New substances with different chemical compositions and properties are produced during a chemical change. 2. Irreversibility: Chemical changes are typically irreversible, meaning the original substances cannot be easily restored. 3. Energy Changes: Chemical changes often involve the absorption or release of energy, such as heat, light, or sound. 4. Conservation of Mass: The total mass of the substances before and after the chemical change remains the same due to the law of conservation of mass. Examples of chemical changes include combustion (burning), rusting of iron, digestion of food, fermentation, and chemical reactions in which new compounds are formed. Distinguishing between physical and chemical changes is important in understanding the behavior of matter and the processes that occur in various natural and synthetic systems. Scientists use these concepts to study and manipulate substances in fields such as chemistry, materials science, and biochemistry. | ||
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