Physical vs chemical changes notes
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Physical changes alter a substance's appearance or structure but do not change its chemical composition. Examples include melting, freezing, and dissolving. Chemical changes form new substances with different chemical compositions through rearrangement of atoms, as evidenced by production of a gas, change in temperature, formation of a precipitate, or color change. Common chemical changes are rusting, tarnishing, burning, cooking, and digesting.
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Solutions
A solution is a homogeneous mixture composed of a solute dissolved in a solvent. A solution is formed through solvation, where solvent particles surround solute particles and pull them away from each other. The solubility of a substance depends on factors like temperature, pressure, and the properties of the solute and solvent. Increasing temperature, pressure, surface area, or agitation can increase solubility and the rate of solvation. Concentration refers to the ratio of solute to solvent and affects properties like reaction rates.
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Physical or chemical changes
This document discusses the differences between physical and chemical changes. A physical change alters the form of a substance but does not change its chemical composition, while a chemical change transforms a substance into one with different properties. Some signs of a chemical change include color changes, precipitation, gas production, temperature changes, and changes in characteristic properties like odor. Examples are provided of changes that are physical, like cutting paper or a disappearing puddle, versus those that are chemical, such as burning toast or rocket fuel.
Physical and chemical changes
Physical and chemical changes can be distinguished based on whether the chemical composition changes. A physical change alters the physical properties of a substance without changing its chemical makeup, while a chemical change produces new substances through changes in chemical bonds. Some key differences are that physical changes are typically reversible and do not involve changes in mass or energy, while chemical changes are irreversible reactions that do involve mass and energy changes. Examples of physical changes include melting, freezing, and dissolving, while examples of chemical changes include combustion and rusting. Chemical reactions require close contact between reactants and an input of energy to allow bonds to break and form.
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Strong weak acids and bases
Acids are divided into two categories based on the ease with which they can donate protons to the solvent: i) strong acids and ii) weak acids
Strong acids are acids that completely dissociate in water. The reaction of an acid with its solvent (typically H2O) is called an acid dissociation reaction.
Weak acids are acids that dissociate partially in water. The extent of dissociation is given by the equilibrium constant.
Note:
A measure of the relative strength of an acid is: i) the equilibrium constant ka of the dissociation reaction of the acid in water (depends on temperature) ii) the degree of dissociation α of the acid in water (depends on the concentration of the acid an on temperature).
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Physical or chemical changes
This document discusses the differences between physical and chemical changes. A physical change alters the form of a substance but does not change its chemical composition, while a chemical change transforms a substance into one with different properties. Some signs of a chemical change include color changes, precipitation, gas production, temperature changes, and changes in characteristic properties like odor. Examples are provided of changes that are physical, like cutting paper or a disappearing puddle, versus those that are chemical, such as burning toast or rocket fuel.
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Physical and chemical changes can be distinguished based on whether the chemical composition changes. A physical change alters the physical properties of a substance without changing its chemical makeup, while a chemical change produces new substances through changes in chemical bonds. Some key differences are that physical changes are typically reversible and do not involve changes in mass or energy, while chemical changes are irreversible reactions that do involve mass and energy changes. Examples of physical changes include melting, freezing, and dissolving, while examples of chemical changes include combustion and rusting. Chemical reactions require close contact between reactants and an input of energy to allow bonds to break and form.
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Acids are divided into two categories based on the ease with which they can donate protons to the solvent: i) strong acids and ii) weak acids
Strong acids are acids that completely dissociate in water. The reaction of an acid with its solvent (typically H2O) is called an acid dissociation reaction.
Weak acids are acids that dissociate partially in water. The extent of dissociation is given by the equilibrium constant.
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- In solids, particles are closely packed in a fixed shape and volume. Liquids have a fixed volume but no shape, and particles can move around each other. Gases have no fixed shape or volume, and particles move independently at high speeds.
- The kinetic theory model explains states in terms of particle motion. In solids, particles vibrate in fixed positions. In liquids, they move in clusters. Gases have particles very far apart traveling at high speeds.
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Ppt chemical or physical reaction
Here are the examples added to the table:
Chemical Physical
Making toast Boiling water
Boiling an egg A light bulb getting hot
Food going mouldy Adding sugar to a cup of tea
Setting off a firework Diluting orange juice with water
Frying an egg Puddles drying
Physical/ Chemical ppt
The document discusses physical and chemical properties of matter. It defines physical properties as characteristics that can be observed or measured without changing the identity of the substance, such as length, mass, volume, and density. It also discusses physical changes which alter physical properties but not chemical identity. Chemical properties allow substances to undergo chemical reactions resulting in new substances. Chemical changes alter chemical identity and are not reversible through physical means alone. The law of conservation of mass states that mass is never lost or gained during physical or chemical changes.
Form 4 Chapter 5 Part 2
This chapter discusses different types of energy and chemical changes including physical and chemical changes, the reactivity series of metals, the extraction of tin through chemical processes, the process of electrolysis to separate substances, the production of electrical energy through chemical reactions, chemical reactions that occur in the presence of light, and the use of chemical reactions as sources of energy.
Physical, chemical changes & states of matter.ppt
Physical changes alter the shape or form of a substance but not its chemical composition. Chemical changes alter the molecular structure of a substance and create new substances. States of matter include solids, liquids, gases, and plasmas, which substances can transition between when temperature or other conditions change. A Bose-Einstein condensate is a state of matter that occurs when atoms are cooled to near absolute zero and behave as a single superatom.
Physical & chemical changes
This document discusses physical and chemical changes. It defines physical changes as changes that affect physical properties but do not form new substances, while chemical changes form new substances with different properties and identities. Examples of physical changes given include state changes like melting and dissolving, while chemical changes include cooking, burning, and rusting. Signs that a chemical change is occurring include changes in color, odor, production of heat, fizzing or bubbling, sound, and light. The document asks readers to identify examples as physical or chemical changes.
Form 4 Chapter 5 Part 1
This chapter discusses physical and chemical changes, heat changes during chemical reactions, and the reactivity series of metals. Physical changes alter a substance's physical properties without changing its chemical composition, while chemical changes form new substances. Chemical reactions either absorb or release heat, changing the temperature of the surroundings. Metals exist in a reactivity series based on their tendency to undergo replacement reactions, with more reactive metals displacing less reactive ones.
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Physical and chemical changes
This document discusses physical and chemical changes. It defines physical changes as changes in a substance's appearance or state without producing a new substance. Chemical changes produce new substances through chemical reactions. Examples of each type of change are provided, along with activities and demonstrations to illustrate the differences between physical and chemical changes. Key terms related to changes in matter are also defined.
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This document discusses physical and chemical properties and changes in matter. It provides examples of physical properties including state, size, mass, density, and magnetic properties. Examples of physical changes include changes in state, dissolving, and changes in shape. Chemical properties include ability to burn and examples of chemical changes are burning and rusting. The document also discusses signs that a chemical change has occurred such as release of energy, change in odor or color, and formation of gases or solids.
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This document discusses physical and chemical changes. It defines physical changes as changes where the substance does not change identity, and chemical changes as changes where the substance is transformed into a new substance. It provides examples of physical changes like melting ice cream and chemical changes like burning a candle. It also discusses how physical and chemical changes are relevant to collecting evidence at crime scenes.
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A physical change alters a substance's physical properties but not its chemical identity, while a chemical change transforms a substance into different substances through breaking or forming of chemical bonds. Changes in color, mass, or release of gases indicate a chemical change has occurred, whereas changes in state or phase without a new substance forming signal a physical change. Students can identify if a change is physical or chemical based on observable evidence like changes in properties or formation of new substances.
Josh physical + chemical change
A physical change alters the form or shape of a substance but does not change its chemical composition, while a chemical change produces one or more new substances. Examples of chemical changes include burning a log or frying an egg, which change color and properties. Chemical changes are important because they underlie processes like producing clothing and food as well as energy generation in living things.
Matter (Edre)
This document discusses different types of matter and changes in states of matter. It defines matter as anything that takes up space and has mass, and describes the three common states as solids, liquids, and gases. Examples are given of materials in each state. Physical changes that do not alter the chemical makeup of a substance, like melting, boiling, and condensation, are distinguished from chemical changes where new substances are formed. The document also defines homogeneous materials as having identical properties throughout and heterogeneous materials as having varying properties due to different components.
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This document discusses how to identify chemical reactions and changes through various signs and properties. It defines chemical and physical changes, noting that a chemical change results in a new substance. It then outlines several signs that a chemical reaction has occurred, including color changes, gas production, changes in energy, and formation of precipitates. Specific examples are provided for each, such as burning toast resulting in a color change and vinegar and baking soda producing gas. The document emphasizes that a chemical reaction can be identified by the formation of a new substance with different chemical and physical properties compared to the original substances.
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The document discusses different states of matter and types of changes that matter can undergo. It explains that matter exists as solids, liquids, or gases, and that physical changes alter a substance's state or shape without changing its chemical makeup. Chemical changes, by contrast, create new substances with different chemical properties. The document also defines mixtures as combinations of two or more materials that can be either homogeneous, where the components can't be seen, or heterogeneous, where they can. Common separation methods are described.
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This document discusses physical and chemical changes in matter. It begins by outlining key questions about how matter changes and objectives to analyze how matter changes physically and chemically. Examples of physical changes discussed include tearing paper, molding clay, and folding a handkerchief. Chemical changes discussed include rusting iron, souring milk, and ripening fruits. A physical change alters the appearance of matter but does not change its chemical composition, while a chemical change produces new substances. The document seeks to demonstrate the difference between physical and chemical changes in various examples and situations.
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This document discusses physical and chemical changes. It defines physical changes as temporary and reversible, with no new substances formed. Examples given are folding paper, drying clothes, and freezing water. Chemical changes are defined as permanent, irreversible changes that produce new substances. Examples provided are rusting iron, burning wood, and digestion of food. The document then explains that chemical changes involve reactants forming products, and lists conditions like physical contact, solution, heat, and catalysts that can induce chemical reactions.
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This document discusses physical and chemical changes in matter. It begins by outlining key questions about how matter changes and objectives to analyze how matter changes physically and chemically. It then provides examples of physical changes like tearing paper, folding a handkerchief, and mixtures. Chemical changes form new substances, like rusting iron or souring milk. Finally, it defines physical changes as changes in size, shape or appearance without new substances, while chemical changes result in new substances and altered properties.
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This document provides information about the three states of matter: solids, liquids, and gases. It defines each state, provides examples, and discusses physical and chemical changes. Users can learn about each state through short sections and then test their knowledge with a multiple choice quiz at the end.
Topic 1
Chemical and physical changes can be distinguished based on whether changes occur at the molecular level or involve energy and states of matter. Physical changes alter the shape or state of matter of a substance without changing its chemical composition, such as crushing a can or melting ice. Chemical changes involve transformations of molecular structure and composition through breaking and forming of chemical bonds, such as rusting of iron or burning of sugar. While some changes are obvious, others occur at the microscopic level of molecular structure and bonding.
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This document discusses physical and chemical changes in matter. It provides examples of physical changes such as melting, freezing, evaporation and condensation. Chemical changes result in new substances forming, like rusting, burning, and cooking. The key questions are how matter changes and the importance of understanding matter's properties and types. The objectives are to analyze how matter changes physically and chemically, and demonstrate ways matter undergoes property changes.
changesofmatter-120111022019-phpapp01.pptx
This document discusses physical and chemical changes in matter. It defines physical changes as changes in state or form without a change in chemical composition, such as water freezing to ice. Chemical changes result in new substances forming through chemical reactions, as seen when iron rusts. The document outlines several properties and signs that can indicate if a physical or chemical change has occurred, such as changes in density, melting point, or the production of gas.
Physical and Chemical Changes.pptx
Physical and Chemical Changes of Matter. Matter undergoes changes........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ MATTER.
Lecture 1&2
1. Chemistry is the study of matter and its properties, composition, structure and the changes it undergoes.
2. Matter exists in three physical forms - solid, liquid and gas - depending on conditions like temperature and pressure.
3. Elements and compounds are the two main categories of pure substances, while mixtures can be either homogeneous or heterogeneous.
Visual aid for
A physical change is a change in which no new substances are formed and the physical properties remain the same, making most physical changes reversible. Examples of physical changes include changes of state, such as water changing between liquid, solid, and gas forms, as well as changes in density or shape. A chemical change involves a chemical reaction that produces new chemical substances and is typically irreversible.
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This document provides information about the three states of matter - solids, liquids, and gases. It defines each state, provides examples, and describes how physical properties differ between states. The document also discusses physical and chemical changes, giving examples of each type. A short quiz at the end tests the reader's understanding of states of matter and changes between states.
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Changes in matter.pptx 20013 2014 ( Physical and chemical change)
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Physical changes alter a substance's appearance or structure but do not change its chemical composition. Examples include melting, freezing, and dissolving. Chemical changes form new substances with different properties through rearrangement of atoms, as seen in rusting, burning, and cooking. Evidence of a chemical change may include production of a gas, change in temperature, formation of a precipitate, or color change. A chemical change can be confirmed if the products of a chemical equation are different from the reactants.
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The cost of information acquisition by natural selection
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3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
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Classification
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When I was asked to give a companion lecture in support of ‘The Philosophy of Science’ (https://shorturl.at/4pUXz) I decided not to walk through the detail of the many methodologies in order of use. Instead, I chose to employ a long standing, and ongoing, scientific development as an exemplar. And so, I chose the ever evolving story of Thermodynamics as a scientific investigation at its best.
Conducted over a period of >200 years, Thermodynamics R&D, and application, benefitted from the highest levels of professionalism, collaboration, and technical thoroughness. New layers of application, methodology, and practice were made possible by the progressive advance of technology. In turn, this has seen measurement and modelling accuracy continually improved at a micro and macro level.
Perhaps most importantly, Thermodynamics rapidly became a primary tool in the advance of applied science/engineering/technology, spanning micro-tech, to aerospace and cosmology. I can think of no better a story to illustrate the breadth of scientific methodologies and applications at their best.
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Physical vs chemical changes notes
- 2. TEKS 6.5D identify the formation of a new substance by using the evidence of a possible chemical change such as production of a gas, change in temperature, production of a precipitate, or color change. TEKS 8.5E investigate how evidence of chemical reactions indicate that new substances with different properties are formed.
- 3. Matter undergoes changes all of the time.
- 4. There are two types of changes: chemicalchemical physicalphysical &&
- 6. Physical changes occur when the appearance of a substance changes…
- 8. The individualThe individual molecules domolecules do notnot changechange..
- 9. Examples ofExamples of physical changesphysical changes are, melting,are, melting, freezing,freezing,
- 10. or changingor changing sizesize oror shapeshape..
- 11. A physicalA physical change alsochange also occursoccurs whenwhen substancessubstances are…are…
- 12. mixedmixed and somethingand something dissolvesdissolves…like making…like making salt water or Kool-salt water or Kool- aid.aid.
- 13. The water, saltThe water, salt and sugar stilland sugar still keep theirkeep their originaloriginal propertiesproperties andand the substancesthe substances can be separatedcan be separated again.again.
- 15. AA chemicalchemical changechange occursoccurs when the atomswhen the atoms making up mattermaking up matter rearrangerearrange....
- 16. to form a newto form a new substance withsubstance with new propertiesnew properties..
- 17. This usuallyThis usually occurs during aoccurs during a chemicalchemical reactionreaction..
- 18. Evidence ofEvidence of a chemicala chemical change:change:
- 19. ProductionProduction of a gas.of a gas.
- 21. color changecolor change *not all color*not all color changes arechanges are chemical!chemical!
- 22. AA differentdifferent color appearscolor appears
- 23. *not all color*not all color changes arechanges are chemical!chemical!
- 25. cloudinesscloudiness foggyfoggy solidsolid atat bottom ofbottom of containercontainer
- 26. Change inChange in heatheat or lightor light energyenergy
- 30. ……a chemical changea chemical change has not actuallyhas not actually taken place unlesstaken place unless matter has changedmatter has changed into ainto a newnew substancesubstance..
- 31. Some commonSome common examples ofexamples of chemicalchemical changeschanges include…include…
- 32. RustingRusting……
- 34. Burning…Burning…
- 35. Cooking…Cooking…
- 37. If you have theIf you have the chemicalchemical equationequation,, you can tell if ayou can tell if a chemical changechemical change has taken placehas taken place by…by…
- 38. Looking to seeLooking to see if the productsif the products in the equationin the equation are….are….