PHYSICAL AND CHEMICAL CHANGE
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This document discusses the differences between physical and chemical changes. Physical changes can be easily undone and do not change the substance's composition, though the substance's state or the arrangement of its molecules may change. Chemical changes result in a new substance through molecular rearrangement and cannot be easily reversed. Examples of physical changes include breaking or cutting an object, while examples of chemical changes include burning wood or digesting food.
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The document lists and describes examples of physical and chemical changes. Physical changes include changes in state through melting, boiling, evaporation, or freezing, which do not alter the chemical makeup of the substance. Chemical changes result in the formation of new chemical substances through chemical reactions, such as burning, rusting, cooking, and digestion.
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This science document discusses physical and chemical changes. It defines reversible changes as changes that can be undone to return a substance to its original state, and irreversible changes as changes that cannot be reversed. The document then gives examples of how the physical properties of substances like shape, size, color, and state can be changed through physical changes like folding, cutting, heating and cooling. It states that physical changes involve alterations in physical properties but do not create new substances, and most physical changes are reversible but some like cutting are irreversible.
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This document discusses different types of changes including reversible, irreversible, physical, and chemical changes. Reversible changes alter the physical state of a substance but do not form new substances. Irreversible changes cannot be undone and produce new materials that cannot be reformed into the original. Chemical changes always result in new substances through processes like burning or cooking an egg. Physical changes do not create new materials and include crushing a can or melting ice. Examples are provided for each type of change.
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The document discusses different types of changes that occur in daily life. It provides 10 examples of changes: 1) freezing of water, 2) curdling of milk, 3) boiling of milk, 4) cooking of food, 5) sublimation of naphthalene balls, 6) digestion of food, 7) condensation of water droplets, 8) rusting of iron nails, 9) dissolving of sugar in water, and 10) burning of a candle. Each example is classified as a physical change or chemical change, and whether it is reversible, desirable, fast or slow, and exothermic or endothermic. The examples demonstrate the various kinds of changes that can be observed in natural and human-
Physical and chemical change
This document discusses the difference between physical and chemical changes. Physical changes involve alterations to a substance's physical properties like size, shape, or phase without changing its chemical composition. Examples given are melting ice, tearing paper, and blowing a balloon. Physical changes are reversible. Chemical changes result in new substances forming with different chemical compositions and properties. Examples of chemical changes include rusting iron, burning paper, and ripening fruits. Chemical changes are irreversible.
Physical vs chemical changes notes
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 document discusses different types of changes: reversible changes can return a substance to its original state without a new substance forming, irreversible changes cannot be undone, chemical changes produce a new substance, and physical changes alter a substance's form but not its chemical composition. Examples are given of melting ice and blowing a balloon as reversible changes, baking a cake and cooking an egg as chemical changes, and boiling water and crushing a can as physical changes.
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This document discusses the difference between physical and chemical changes. Physical changes involve alterations to a substance's physical properties like size, shape, or phase without changing its chemical composition. Examples given are melting ice, tearing paper, and blowing a balloon. Physical changes are reversible. Chemical changes result in new substances forming with different chemical compositions and properties. Examples of chemical changes include rusting iron, burning paper, and ripening fruits. Chemical changes are irreversible.
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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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Physical changes alter the physical properties of a substance but do not change its chemical composition. Chemical changes produce new substances through chemical reactions. Some signs that a chemical change has occurred include a color change, gas formation, changes in temperature or light emission, precipitation of a solid, or production of a gas. Common examples of physical changes are melting, freezing, and cutting, while chemical changes include burning, digestion, and rusting.
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Changes can be classified in several ways, including whether they are reversible or irreversible, desirable or undesirable, and physical or chemical. Reversible changes can be undone by changing conditions back, while irreversible changes form new substances. Desirable changes are useful, like digestion, while undesirable changes are harmful, like rusting. Physical changes alter a substance's properties but not its chemical makeup, through processes like melting, freezing, and dissolving. Chemical changes create new substances through chemical reactions like burning and fermentation. Chemical changes also involve changes in mass or energy absorption/release.
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Unit b matter and chemical change notes(physical & chemical changes)
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Syllabus
Chapter-1
Introduction to objective, scope and outcome the subject
Chapter 2
Introduction: Scope and Specialization of Civil Engineering, Role of civil Engineer in Society, Impact of infrastructural development on economy of country.
Chapter 3
Surveying: Object Principles & Types of Surveying; Site Plans, Plans & Maps; Scales & Unit of different Measurements.
Linear Measurements: Instruments used. Linear Measurement by Tape, Ranging out Survey Lines and overcoming Obstructions; Measurements on sloping ground; Tape corrections, conventional symbols. Angular Measurements: Instruments used; Introduction to Compass Surveying, Bearings and Longitude & Latitude of a Line, Introduction to total station.
Levelling: Instrument used Object of levelling, Methods of levelling in brief, and Contour maps.
Chapter 4
Buildings: Selection of site for Buildings, Layout of Building Plan, Types of buildings, Plinth area, carpet area, floor space index, Introduction to building byelaws, concept of sun light & ventilation. Components of Buildings & their functions, Basic concept of R.C.C., Introduction to types of foundation
Chapter 5
Transportation: Introduction to Transportation Engineering; Traffic and Road Safety: Types and Characteristics of Various Modes of Transportation; Various Road Traffic Signs, Causes of Accidents and Road Safety Measures.
Chapter 6
Environmental Engineering: Environmental Pollution, Environmental Acts and Regulations, Functional Concepts of Ecology, Basics of Species, Biodiversity, Ecosystem, Hydrological Cycle; Chemical Cycles: Carbon, Nitrogen & Phosphorus; Energy Flow in Ecosystems.
Water Pollution: Water Quality standards, Introduction to Treatment & Disposal of Waste Water. Reuse and Saving of Water, Rain Water Harvesting. Solid Waste Management: Classification of Solid Waste, Collection, Transportation and Disposal of Solid. Recycling of Solid Waste: Energy Recovery, Sanitary Landfill, On-Site Sanitation. Air & Noise Pollution: Primary and Secondary air pollutants, Harmful effects of Air Pollution, Control of Air Pollution. . Noise Pollution Harmful Effects of noise pollution, control of noise pollution, Global warming & Climate Change, Ozone depletion, Greenhouse effect
Text Books:
1. Palancharmy, Basic Civil Engineering, McGraw Hill publishers.
2. Satheesh Gopi, Basic Civil Engineering, Pearson Publishers.
3. Ketki Rangwala Dalal, Essentials of Civil Engineering, Charotar Publishing House.
4. BCP, Surveying volume 1
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Date: May 29, 2024
Tags: Information Security, ISO/IEC 27001, ISO/IEC 42001, Artificial Intelligence, GDPR
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RHEOLOGY Physical pharmaceutics-II notes for B.pharm 4th sem students
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PHYSICAL AND CHEMICAL CHANGE
- 2. Physical changes:Physical changes: Can easily be undone.Can easily be undone. Do not change into a different substance.Do not change into a different substance. Can change states(solid, liquid ,gas &Can change states(solid, liquid ,gas & plasma).plasma). Temporary changeTemporary change Arrangement of molecules occursArrangement of molecules occurs
- 3. EXAMPLES OF PHYSICAL CHANGE BREAKING AN OBJECT (2 PIECES OF A PENCIL) CUTTING OF WOOD WATER BECOMING WATER VAPOUR MELTING OF WAX
- 5. Chemical changes:Chemical changes: Change in colour occurs.Change in colour occurs. Change in odor.Change in odor. Might produce a gas or precipitate.Might produce a gas or precipitate. Energy may be released or absorbed.Energy may be released or absorbed. Forms a new substance.Forms a new substance. Can not be easily reversed.Can not be easily reversed. Permanent changePermanent change
- 6. EXAMPLES OF CHEMICAL CHANGE • BURNING OF WOOD • RUSTING OF IRON • EXPLOSION OF CRACKERS
- 9. REMEMBER… SOME THINGS THAT HINT A CHEMICAL CHANGE HAS TAKEN PLACE •HEAT OR LIGHT IS GIVEN OFF •BUBBLES OF GAS ARE GIVEN OFF •A PRECIPITATE IS FORMED •THE CHANGE IS DIFFICULT TO REVERSE
- 12. CLASSIFY INTO CHEMICAL & PHYSICALCLASSIFY INTO CHEMICAL & PHYSICAL CHANGESCHANGES SODIUM HYDROXIDESODIUM HYDROXIDE DISSOLVESDISSOLVES IN WATERIN WATER HClHCl REACTSREACTS WITH KCl TO PRODUCE A SALT,WITH KCl TO PRODUCE A SALT, WATER,WATER, AND HEATAND HEAT A PELLET OF SODIUM IS SLICED IN TWOA PELLET OF SODIUM IS SLICED IN TWO ICE MELTSICE MELTS MACARONI SALAD SPOILS IN THE SUNMACARONI SALAD SPOILS IN THE SUN WATER EVAPORATESWATER EVAPORATES COOKING BROWNIESCOOKING BROWNIES A BALLOON IS FILLED WITH AIRA BALLOON IS FILLED WITH AIR THE BODY DIGESTING FOODTHE BODY DIGESTING FOOD A CATERPILLAR TRANSFORMING INTO AA CATERPILLAR TRANSFORMING INTO A