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Physical and Chemical Changes

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Elizabeth Vang

on 11 May 2013

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Transcript of Physical and Chemical Changes

Learning Target I can tell the difference between physical and chemical changes. Physical Change Physical change is reversible in the
physical property of a substance. A physical change can not produce a new substance,
but it changes the state of a substance . Chemical Change A chemical change produces a new substance. MELTING FREEZING VAPORIZATION CONDENSATION SUBLIMATION Chemical changes aren't reversible. A chemical change makes a substance that wasn't there before. Characteristic Properties
A characteristic property is a property of a solid, liquid or gas, which is unique to that substance. Boiling Point Freezing Point 100 Degrees Celcius 0 Degrees Celcius A physical change is a change in appearance. Condensation is the part of the water cycle. It's the process when water that collects as droplets on a cold surface. Boiling water is to ____________
as baking a cake is to __________. Boiling water is to physical change
as baking a cake is to chemical change. The act or process of vaporizing, or the state of being converted into vapor; the artificial formation of vapor; specifically the conversion of water into steam as in steam boiler. Definition:
A usually irreversible chemical reaction involving the rearrangement of the atoms of one or more substances and a change in their chemical properties or composition, resulting in the formation of at least one new substance. Examples:
Baking a cake.
Frying an egg.
Burning paper. Signs of Chemical Change:
Color
Energy
Temperature
Appearance
Chemical Reaction Definition:
A usually reversible change in the physical properties of a substance, as size or shape: Freezing a liquid is a physical change. Signs of Physical Change:
Size
Shape
Color
Texture
Smell
Mass Examples:
Boiling water.
Crumpled paper.
An ice cube melting. Law of Conservation
It is the total amount of energy in an isolated system remains constant over time. To become liquefied by warmth or heat, like ice, snow, butter, or metal. Freezing is extremely or uncomfortably cold; chilled or it is frozen. Evaporation-
Conversion of a liquid to the vapor state by the addition of latent heat. Conversion of a substance from the solid to the vapor state without its becoming liquid. Chemical Activity The ability of a substance to undergo a chemical change. THE END Questions: 1) Name one example of a chemical change and physical change. 4) Is a physical change reversible? 3) What is sublimation? Conversion of a substance from the solid to the vapor state without its becoming liquid. No, a chemical change is not reverisble. The Difference Between A Physical Change and A Chemical Change A physical change changes the state of a substance and a chemical change makes a new substance. Examples of Chemical Change :
Baking a cake.
Frying an egg.
Burning paper. Examples of Physical Change:
Boiling water.
Crumpled paper.
An ice cube melting. 5) 2) A physical change is to __________ as
chemical changes is to ____________. A physical change is to reversible as
chemical changes is to not reversible. 6) Freezing point is to ______________ as boiling point is to ______________. Answers: 1) 2) 3) 4) 5) 6) Name one example of a chemical change and physical change. A physical change is to __________ as
chemical changes is to ____________. What is sublimation? Is a chemical change reversible? Boiling water is to ____________
as baking a cake is to __________. Freezing point is to ______________ as boiling point is to ______________. Freezing point is to 0 Degrees Celcius
as boling point is to 100 Degrees Celcius. THANK YOU FOR WATCHING WATCH A VIDEO WATCH A VIDEO The boiling point of an element or a substance is the temperature at which the vapor pressure of the liquid equals the environmental pressure surrounding the liquid. It is the teperature at which something freezes.
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