arya pratheesh
TRANSCRIPT
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SREEKANDESWARAMPOOCHAKKAL
B.Ed-2013-2014
KEARALA UNIVERSITY
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Submitted by : Arya p m
: PHYSICAL SCIENCE
:13383007
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Submitted to: LINI MOL K SFACULTY IN PHYSICAL SCIENCE DEPARTMENT
SNTC POOCHAKKAL
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Copyright © Houghton Mifflin Harcourt Publishing Company
What are physical changes of matter?
• A physical change is a change that affects one or more physical properties of a substance.
• The appearance, shape, or size of a substance may be altered during a physical change.
• Physical changes, such as changes in state(boiling water), dissolving sugar in water, cutting paper, crushing an aluminum can, do not change the chemical identity of a substance.
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Physical Changes of Matter
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Copyright © Houghton Mifflin Harcourt Publishing Company
What are chemical changes of matter?
• A chemical change is the process by which one or more substances change into entirely new substances.
• Chemical changes are not the same as chemical properties.
• Burning is a chemical change; flammability is a chemical property.
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What are chemical changes of matter?
• When the particles and chemical bonds that make up a substance are rearranged, a chemical change has taken place.
• Chemical changes are often influenced by temperature. At higher temperatures, the particles in a substance have more average kinetic energy or energy of motion.
• Higher temperatures often mean faster chemical reactions because the particles that make up a substance move more freely and rearrange more easily.
Copyright © Houghton Mifflin Harcourt Publishing Company
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Copyright © Houghton Mifflin Harcourt Publishing Company
How can you tell a chemical change has happened?
• There are several signs that a chemical reaction has occurred.
• Observing two or more of these signs during a change means you are likely observing a chemical change.
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• Odors can be produced during a chemical change.
• Fizzing and foaming may mean gases are being produced.
• The production of gas is often evidence of a chemical change.
• Boiling also can produce gas bubbles, but boiling is a physical change.
Copyright © Houghton Mifflin Harcourt Publishing Company
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• A precipitate is a solid that falls out of solution.
• The formation of a precipitate can indicate a chemical change.
• Energy changes from one form to another can be evidence of a chemical change.
• Changes in temperature and color can be signs of a chemical change.
Copyright © Houghton Mifflin Harcourt Publishing Company
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Chemical Changes of Matter
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More examples for physical change
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Boiling water
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Removing iron filings from a mixture
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Broken glass
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Salt and water
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Cut paper
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More examples for chemical changes
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Fire work
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Rusting nails
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Vinegar and Baking soda
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Effervescent tablet
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Burning wood
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