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Topic: Physical change

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	Distinction between Chemical and Physical Changes
		Physical changes are similar in some ways because you are looking at the same kinds of things--changes in the phase, the color, the temperature.
		Also included in physical changes are color changes that are caused simply by mixing or by diluting a material or, in some cases, even by heating.
		Physical changes and chemical changes have much in common in that you are looking at similar kinds of results.
	dl.clackamas.cc.or.us /ch104-01/DistChemPhyChange.htm (565 words)

	Mini-Unit Overview (Site not responding. Last check: 2007-10-09)
		The physical states or phases of water are easily taught during a physical change unit because it is such an easy and familiar concept for students.
		Physical change is directly related to chemical change, it is very important for students to understand the difference between these two concepts because they are easily confused.
		Physical change in matter is a basic concept that forms the foundation for future study in physical science.
	www.cord.edu /faculty/nelsons/ed337/units/phychangeSara.html (2955 words)

	What is the difference between a physical change and a chemical change?
		A physical change is reversible, a chemical change is not.
		A physical change is a change in which no new substance is formed; a chemical change results in the formation of one or more new substances.
		Is that a physical or a chemical change?
	www.physlink.com /Education/AskExperts/ae244.cfm (447 words)

	chemical_physical (Site not responding. Last check: 2007-10-09)
		In a nut shell: a chemical change always involves a chemical reaction and results in a new chemical substance being formed, while a physical change alters the appearance of the substance without changing its composition.
		Physical changes may include: phase transformation such as liquid turning into vapor (by boiling or room temperature evaporation), solid turning into vapor (subliming iodine), liquid turning into solid (e.g.
		The color change of a solution may be confusing and a careful investigation is necessary to make an educated decision whether it is a result of a chemical or physical change.
	www.slcc.edu /schools/hum_sci/chemistry/labs/chem1130/chemical_physical/chemical_physical.htm (1094 words)

	Chemical & Physical Changes - for 11 to 14 year-olds: By Laura Gallagher, Loreto College, Coleraine.
		Chemical and Physical Changes - for 11 to 14 year-olds: By Laura Gallagher, Loreto College, Coleraine.
		A chemical change is usually contrasted with a physical change, in which a substance changes form but keeps its chemical properties remains the same.
		The distinction between physical and chemical change is not absolute, and some important types of change, such as the dissolving of salt in water, could be regarded as either being chemical or physical, or both.
	www.lcc.ukf.net /KS3Chem/chemphychanges.htm (555 words)

	Physical and Chemical Change (Site not responding. Last check: 2007-10-09)
		Physical changes occur when objects undergo a change that does not change their chemical nature.
		Physical properties can be observed without changing the type of matter.
		Physical and chemical changes are the two basic ways that matter can change.
	www.uen.org /utahlink/activities/view_activity.cgi?activity_id=10289 (180 words)

	NIH Guide: MECHANISMS OF PHYSICAL ACTIVITY BEHAVIOR CHANGE
		Physical activity can be important in preventing weight gain and in decreasing weight, but few adults or children/adolescents actually achieve the recommended 30 minutes of moderate physical activity on most days of the week (15% and 20%, respectively).
		Physical activity tends to decrease with age and to be lower among women, non-Hispanic white, and among those with lower socioeconomic status (Sallis & Owen, 1999).
		Genetic predisposition is expected to influence behavior and change in physical activity behavior; however, the science is not sufficiently advanced at this time to consider studying genetic predisposition as part of this RFA.
	grants.nih.gov /grants/guide/rfa-files/RFA-CA-04-009.html (5665 words)

	Porter Center - Physical and Chemical Changes
		A suggested method for discussing the data is to ask one Spokesperson the color of the Science Dough before their change, what change was made by the team, and then the color after the change (the color should stay the same).
		Physical properties of the lemon juice are discussed through questions and responses between the PCI and the students.
		What is your evidence of that change?" (The change that occurred was a chemical change because a gas was released, a new substance was created and cannot be returned to the original form, and heat was transferred from the substance during the change.)
	www.lcesc.k12.oh.us /PorterCenter/DL_phys-chem.htm (1721 words)

	Physical Properties
		Physical properties are used to observe and describe matter.
		Physical changes are related to physical properties since some measurements require that changes be made.
		As the iodine is heated it undergoes a physical change to the gas state as shown in the graphic on the left.
	www.elmhurst.edu /~chm/vchembook/104Aphysprop.html (293 words)

	Adventure 2 - Physical and Chemical Changes
		Some examples of physical changes are: water boiling, a gas being compressed, sugar dissolving in water, and cutting up a piece of paper.
		Chemical changes are usually accompanied by one or more physical changes such as a color change, the formation of a gas or a precipitate, or a change in temperature.
		Some examples of chemical changes are the rusting of iron, the digestion of food, and the change in color of leaves in the autumn.
	asweb.unco.edu /depts/chemistry/chem108de/adventure2.htm (632 words)

	Reactions
		A change in matter where new kinds of molecules are formed is called a chemical change.
		When matter changes state, it can produce a gas or a solid from a liquid too, yet changing state is a physical change.
		Changes of phase (to and from solid, liquid, gas, and plasma) are physical changes because the molecules change how much they are moving but stay the same molecules.
	www.dmturner.org /Teacher/Library/5thText/ChemPart6.htm (1159 words)

	change
		A physical change means that no new substance is formed.
		A change in size or shape is a...
		A chemical change means that a new substance with new properties is formed.
	www.smaphysics.ca /senior1/chemistry/chemtests/physchem.html (107 words)

	Particle Theory - physical and chemical change
		Changes of state such as melting or boiling are physical changes and are generally easy to reverse though the end product may not always look exactly the same as the starting material.
		When substances change state there is no change in mass so if 100 g of ice is melted 100g of water are formed this will boil to form 100g of steam (this is called "conservation of mass").
		Changes due to cooking are often complex as the substances contained within foods are complex but they do provide vivid examples of changes with which children may be familiar.
	www.le.ac.uk /education/centres/sci/selfstudy/particle03.html (791 words)

	Chemical Changes
		As in the case of autumn leaves, a change in color is a clue to indicate a chemical change.
		The formation of a gas is a clue to chemical changes.
		Another clue that a chemical change has occurred is the formation of a solid.
	www.ric.edu /ptiskus/chemical (573 words)

	Physical Changes and Chemical Changes (Site not responding. Last check: 2007-10-09)
		A physical change is one in which the appearance of matter changes, but its chemical properties remain the same.
		Melting, freezing, boiling, cutting, grinding, compressing and expanding are all examples of physical changes that could happen to a substance.
		A chemical change is a change that produces one or more kinds of matter that are different from those present before the change.
	home.comcast.net /~summersrule/matterwebsite/physicalchangesandchemicach.htm (268 words)

	Physical/Chemical Changes: Sample Lessons: Understanding Science through Captioning: Teaching Handbooks: Tools & ...
		Physical change is a change in a material's size, shape or state of matter; it is still the same material
		Chemical change is a change that produces a new substance or substances
		Discuss the significance of the fact that in a physical change the resulting substance is still the same substance.
	udl.cast.org /udl/PhysicalChemicalChanges902.cfm (488 words)

	[No title]
		Physical properties are those properties whose observation does not involve a change in the composition of the sample.
		Another physical change, the crushing of limestone, is illustrated in Figure 8.1.
		The observation of a chemical property involves a change in the composition of the sample - that is, a chemical change.
	genchem.chem.wisc.edu /sstutorial/Text8/Tx81/tx81.html (581 words)

	Physical Science \| Session 4
		Physical change: Although some extensive properties (like shape, phase, etc.) of the material change, the material itself is the same before and after the change.
		Chemical change: The substances present at the beginning of the change are not present at the end; new substances are formed.
		Though it has aspects of a chemical change, scientists would still classify the dissolution of salt as a physical change.
	www.learner.org /channel/courses/essential/physicalsci/session4/closer1.html (467 words)

	More Info on Physical vs. Chemical Change (Site not responding. Last check: 2007-10-09)
		Chemical changes can be distinguished from physical changes on the macroscopic and microscopic levels.
		At the macroscopic level a chemical change can often be recognized by transfer of energy, changes of state (such as formation of a solid or gas), and color changes.
		In both chemical and physical changes, conservation of mass and energy are observed.
	dev.nsta.org /ssc/moreinfo.asp?id=931 (265 words)

	Physical and Chemical Changes
		A physical change in a substance doesn't change what the substance is. In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.
		This would be a physical change in the shape and size of the paper.
		Physical changes can be reversed, chemical changes cannot be reversed with the substance changed back without extraordinary means, if at all.
	www.mcwdn.org /chemist/pcchange.html (359 words)

	chem2 activity
		Their task is to determine which of the reactions result in new materials being created and which result in physical changes only.
		Most chemical changes involve observable changes: heat or light is produced, a color change results or a gas is formed.
		Have students use what they have learned about chemical and physical changes by applying it to the changes, over time, that they have noticed with their own bodies.
	www.caosclub.org /members/chem2.html (838 words)

	Chemical and Physical Changes
		Identify and categorize characteristics of chemical and physical change.
		Physical Change – A change in which one or more substances combine or break apart to form new substances.
		Chemical Change – A change in a substance that does not change its identity; for example, a change of state.
	www.wcslc.edu /education_gslp/Oolytic1.htm (1031 words)

	Matter 8A1
		Physical properties are easy to identify because they involve your senses of sight, touch, taste, smell and hear.
		One of the most common examples of a physical change is the melting of ice.
		A chemical change is a change in which one or more new substances with new properties is formed.
	www.utm.edu /departments/ed/cece/eighth/8A1.shtml (685 words)

	Physical and Chemical Change Quiz
		With a physical change, no new substance is formed.
		With a chemical change, a chemical reaction occurs.
		With a physical change, energy is either given off or absorbed.
	www.mcwdn.org /chemist/pcchangequiz/pcchangequiz.html (52 words)

	General Chemistry Online: FAQ: Matter: What is the difference between chemical and physical change?
		Chemical change is any change that results in the formation of new chemical substances.
		Physical change rearranges molecules but doesn't affect their internal structures.
		For example, boiling coffee involves chemical change (the delicate molecules that give coffee its flavor react with air and become new, bitter-tasting substances) and physical change (the water in the coffee is going from liquid to gaseous form).
	antoine.frostburg.edu /chem/senese/101/matter/faq/physical-chemical.shtml (254 words)

	Chemical Change and Physical Change (Site not responding. Last check: 2007-10-09)
		Chemical Change and Physical Change Vince Davis Sr.
		When a chemical reaction takes place, there is always a change in the properties and in the energy of the substances involved in the chemical reaction.
		Both the physical and chemical properties of the substance are changed.
	www.iit.edu /~smile/ch9604.html (493 words)

	Physical & Chemical Change (Site not responding. Last check: 2007-10-09)
		PHYSICAL CHANGE and CHEMICAL CHANGE.) A physical change is change in size, shape, or state of matter.
		Ice that melts is still water, even though it has changed states.
		That is an example of a physical change.
	home.comcast.net /~rsilverman13/science_education/physical_and_chemical_changes.htm (287 words)

	Physical And Chemical Changes
		Observe ice change from a solid to a liquid and then to a gas (steam).
		Although the ice changed from one phase to another, it is still water and can return back to the solid state again.
		Their response should be no. Therefore, this is a chemical change because we have a new substance formed.
	www.iit.edu /~smile/ch9312.html (594 words)

	Mystery Powders
		A physical change occurs when the appearance of matter changes, but composition of the matter does not change.
		Changes in size, shape, color, odor, hardness, or in state such as gas, liquid, or solid are all considered physical changes.
		Evidence of a chemical change may include production or use of energy such as heat or light, the new production of a gas or solid, or a change in color.
	www.uen.org /Lessonplan/preview.cgi?LPid=2176 (428 words)

	Interactive Practice on Physical vs. Chemical Properties
		Physical properties are properties of an element or compound that can be observed without a chemical reaction of the substance.
		In a physical change, the substances are not altered chemically, but merely changed to another phase (i.e.
		In a chemical change, the substances are altered chemically and display different physical and chemical properties after the change.
	www.teacherbridge.org /public/bhs/teachers/Dana/chemphys.html (149 words)

	Chemical and Physical Changes Lab (Site not responding. Last check: 2007-10-09)
		The procedures chosen include some obvious physical or chemical changes, and some which can be interpreted with less certainty, creating another opportunity for students to defend their conclusions in a peer review.
		It is important that student lab reports are evaluated not on whether or not a physical or chemical change is correctly identified, but by how successfully they defend their conclusions based on the observations they made in lab.
		Theory: A physical change is a chenge in the appearance of a substance, but not its identity.
	www1.umn.edu /ships/modules/mendlev3.htm (1826 words)

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