2+-+States+of+Matter,+Atomic+Structure,+Atomic+Theory

**Objectives** Use the kinetic theory to explain states of matter, phase changes Distinguish among endothermic and exothermic physical and chemical changes Calculate the number of protons, neutrons, and electrons in an isotope Utilize benchmark discoveries to describe the historical development of atomic structure
 * at 25 degrees C water is a liquid because of the attraction between water molecules while kinetic energy allows the sliding of molecules
 * photoelectric effect
 * absorption
 * emission spectra of elements
 * Thompson's cathode ray
 * Rutherford's gold foil
 * Millikan's oil drop
 * Bohr's bright line spectra experiments

**Purpose of Unit** //In this unit, we will learn about the subatomic particles: the proton, neutron, & electron. We will learn how atoms are put together, why they stay together, & how they behave. Students will explore the 4 phases of matter in depth, examine phase diagrams, & determine whether objects are changing in a physical way or a chemical one. The major focus in the lab for this unit is on observing chemical & physical changes. Students will observe dry ice, liquid nitrogen, and explore Non-Newtonian fluids as well as basic changes in matter. Also of major import is the hands-on work taking place in the computer lab. Students will work in groups to explore a particular contribution to the development of the atomic theory. Each group will produce a page on our wiki, collectively creating a timeline of the atomic theory. //

**Resources**



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The video clip posted below is seriously stupid. It warns you over & over again not to try this at home. I posted it because I have never seen anyone do this before & everyone always wonders what would happen if. . . The explanation is also indicates a high level of comprehension with respect to physical changes between liquid & gas! Wow. media type="youtube" key="HAPc6JH85pM" height="315" width="560"

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We tried this on a mini-scale in class! Check out this video for a larger perspective. Dry Ice vs. Liquid Nitrogen. . . media type="youtube" key="ctPbhKldOgA" height="315" width="560"







[|physical chemical change postlab]

Review the States of Matter (Video from KhanAcademy)

On-line Interactive Flashcards - Great Study Tool!!

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[|basic atomic worksheet]



Atomic Structure Worksheet

LAB Calculating Average Atomic Mass

Atomic Mass Problem Worksheet