how are physical and chemical changes affected by temperature?
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Increasing the temperature will cause chemical changes to occur faster. Decreasing the temperature, causes the particles to lose energy which causes them to move around less and slower. The less they move, the less collisions occur, and the less reactions occur between the chemicals = slower reaction rate.
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17. An example of a chemical change is when water freezes. 18. When platinum is heated, then cooled to its original state, we say this is a physical change.
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Chemical changes and physical changes. Chemical changes happen when chemical reactions occur. They involve the formation of new chemical elements or compounds . ... In a physical change, a substance simply changes physical state , eg from a solid to a liquid.
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Physical changes are usually about physical states of matter. Chemical changes happen on a molecular level when you have two or more molecules that interact. Chemical changes happen when atomic bonds are broken or created during chemical reactions.
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Chemical changes involve changing the chemical composition and physical changes only change the physical form of the substance.
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['Chemical changes make new substances. Anytime a new substance is made, a chemical change takes place. ... ', 'Physical changes do not make a new substance. Physical changes come in many forms. ... ', 'Physical changes also happen when matter changes states. ... ', 'Chemical and physical changes are all around us.']
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['Change in Temperature. A change in temperature is characteristic of a chemical change. ... ', 'Change in Color. A change in color is also another characteristic of a chemical reaction taking place. ... ', 'Formation of Bubbles.']
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Thus, color and temperature changes are physical changes, while oxidation and hydrolysis are chemical changes. Odor is generated when substances change composition.
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Warmer temperatures can also lead to a chain reaction of other changes around the world. That's because increasing air temperature also affects the oceans, weather patterns, snow and ice, and plants and animals. The warmer it gets, the more severe the impacts on people and the environment will be.
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How are physical and chemical changes similar and different? (compare and contrast) (Physical and chemical changes are similar because matter experiences a change in state, Physical changes are different because matter remains the same substance, just in a different state, whereas chemical changes change the matter ...
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Effect of Temperature on Enzyme Action. Temperature affects the reaction rate of enzymes, as do pH, substrate concentration and enzyme concentration. At low temperatures, enzymes have low activity. As the temperature rises the rate of reaction increases, usually 2-fold for every 10 degree Celsius rise.
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Physical and chemical changes are similar because both processes result in something that looks different after the change.
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Physical changes are temporary and involve the transformation in different phases of matter like from solid to liquid; liquid to gas. Whereas chemical changes are permanent as it participates in the breaking and formation of new bonds to make the new compounds.
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Entropy Change of Reactions: It is directly proportional to the temperature of the system and thus increases when the temperature increases in a physical transformation. So in the conversion of a solid into a liquid and then that of a liquid into a gas involves an increase in the entropy of the system.
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In a physical change, the molecules are rearranged while their actual composition remains same. In a chemical change, the molecular composition of a substance completely changes and a new substance is formed. Some example of physical change are freezing of water, melting of wax, boiling of water, etc.
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Several factors affect the amount of entropy in a system. If you increase temperature, you increase entropy. (1) More energy put into a system excites the molecules and the amount of random activity. (2) As a gas expands in a system, entropy increases.
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Experiments show that the transferred heat depends on three factors: (1) The change in temperature, (2) the mass of the system, and (3) the substance and phase of the substance. The last two factors are encapsulated in the value of the specific heat.