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8/27 QS - Create a hypothesis for what causes this phenomena - Natural Arch

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Delicate Arch in Winter

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Fin

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Double Arches

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Arches National Park�Almost 2000 arches in this region of Utah

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Causes

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8/29 QS

Explain the difference between a Chemical and Physical change and give an example of each.

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Quick Start 3/5

Balance the equation

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H2 + O2 --------> H20

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Describing Changes in Matter

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Review

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Section 2: Changes in Matter

Put the images into categories and explain what your categories are and why each item is in it.

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Section 2: Changes in Matter

Physical change - a change that does not change the identity of the substance (same things as before - just looks different)

Chemical change - change that combines or breaks apart a substance to create a new substance (not the same thing as before)

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Every change includes a change in energy (thermal)

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Write down 2 Ah-Has from the video

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Section 2: Changes in Matter

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Section 2: Changes in matter

Law of conservation of Mass - matter is neither created or destroyed during a change.

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Describing Physical Changes

As a table group, list as many keys to identifying a physical changes as you can. Then list as many example as you can.

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Section 3 States of matter

Solids

Liquid

Gas

You, Partner, Class - In three rounds you will take 30 seconds to jot down as many facts as possible

definite shape and definite volume

particles packed tightly together

cannot move (they can vibrate though)

no definite shape and definite volume

particles are packed tightly together

allowed to move freely within container and from place to place.

no definite shape and no definite volume

Particles spread to fill available space

Allowed to move freely and from place to place

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Section 4 changes in states of matter

Matter can change state when thermal energy is added or subtracted.

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States of Matter: Extended

There are also two other states of matter that do not really occur naturally on Earth

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Plasma

Bose-Einstein Basics

  • Super Hot, Super Excited Molecules
  • Plasmas are a lot like gases, but the atoms are different, because they are made up of free electrons and ions of an element (positively and negatively charged particles).
  • EX: Northern Lights, Neon Lights, and Stars

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  • At a temperature only a few billionths of a degree above absolute zero a few special elements can become BEC.
  • When all the motion stops the electrons stop moving and all the atoms stop being separate and blob together.
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Changes in states of matter

Matter can change state when thermal energy is added or subtracted.

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Changes in States of Matter

For practice in changes of states of matter click here.

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Describing Chemical Changes

As a table group, list as many keys to identifying a chemical changes as you can. Then list as many example as you can.

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Chemical Changes

WJ: Chemical Change - A change in matter that produces one or more new substances

Wj: Reactant - the substance that undergoes a chemical change

WJ: Product - the new substance/s that is/are formed

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Chemical Bonding

Atoms form bonds when they share or transfer electrons. This is how all the different compounds are formed.

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Breaking the Chemical Bonds

Breaking chemical bonds requires energy while forming bonds releases energy.

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WJ: Exothermic - the reaction releases energy (hotter than before)

WJ: Endothermic - the reaction needs energy (colder than before)

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Chemical Formulas

Chemistry has a version of shorthand that we use to explain what is happening in reactions. We call this a Chemical Formula.

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Reading and Balancing a Chemical Formula

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Chemistry Practice