Mr.+McHugh

Choose an element from the periodic table that has an average atomic mass with 1 or more digits after the decimal. Explain the difference between the **average atomic mass** of YOUR ELEMENT and the **mass number** of a single atom of YOUR ELEMENT. (This will require a minimum of several sentences). Correct vocab use must include: protons, neutrons, isotopes, mass number, average atomic mass. You will need to research your texts, the Internet, etc. in order to understand and explain this concept, but there's a great example to follow below. **Also, you can use wiki editing to do this, mywebspiration.com, or any other appropriate resource as long as the completed assignment appears on your wiki page.**
 * **ASSIGNMENT 4: Average Atomic Mass (of an element) vs. Mass Number (of 1 atom of that element)**

Correct explanation of the difference between **Average Atomic Mass (of your element) vs. Mass Number (of 1 atom of your element)**: 10 points

 * **Lithium in the Pure Form** || **Atomic Diagrams of Various Lithium Isotopes**
 * (Isotopes are atoms with the same name and atomic number of positive protons in the nucleus, but with a different number of neutrons and therefore different mass number. The mass Numbers of these atoms are 6, 7, and 8 respectively.)** ||
 * [[image:http://0.tqn.com/d/chemistry/1/0/W/9/1/lithiummetal.jpg width="280" height="231"]] || [[image:http://astronomy.swin.edu.au/cms/imagedb/albums/userpics/isotopes.jpg]] ||
 * [[image:http://chemwiki.ucdavis.edu/@api/deki/files/4181/=Lithium_final.jpg width="267" height="267"]] || * ==Lithium atoms always have an atomic number of 3 protons...THAT'S WHAT MAKES THEM LITHIUM!==


 * ==What can sometimes be confusing is that different periodic tables include different info and the info is not always in the same spot. When writing the COMPLETE CHEMICAL SYMBOL for an element, always use the format above.==
 * ==Lithium isotope #1 above has 3 protons and 3 neutrons in it's nucleus and therefore has a mass # of 6. Key Point: ==

ONLY 7.59% of Lithium atoms found in nature are like this
> == Key Point: 92.41% of Lithium atoms found in nature are like this == > ==The AVERAGE ATOMIC MASS OF THE ELEMENT LITHIUM (6.941 amu) is the average mass of ALL Lithium atoms found in nature. This is the result of MOST Lithium atoms having a MASS # of 7 amu, and a smaller number of Lithium atoms having a mass of 6 amu.== ||
 * ==Lithium isotope #2 above has 3 protons and 4 neutrons in it's nucleus and therefore has a mass # of 7.==
 * == Final Key Point: ==

media type="custom" key="7745807" 1. Login to www.mywebspiration.com and open the "Classification of Matter" file 2. Complete the activity using the directions found when you open the file. 3. Find a method for posting the completed concept map as a new assignment at the top of your wiki page (Note: there is more than one way to do this depending on the computer you are working on)
 * **ASSIGNMENT 3: Element Advertisement**
 * 1) Form a group (1-2 students only)
 * 2) Decide on an element to work with (get approval from teacher)
 * 3) Decide what format you will use for your advertisement
 * iMovie commercial, Youtube video, Webpage (you may use a new page on your wiki or something else), Podcast? (I don't have much experience I can offer there though). Also, if you have a different idea for an advertisement format, please get approval from me before beginning your work)
 * 1) Research your element and complete [|this sheet]
 * 2) Gather resources to create your advertisement
 * 3) Create your advertisement
 * 4) Post completed advertisement to your wiki
 * **ASSIGNMENT 2: Classification of Matter Flowchart**

1. Look at your notes, text, or Internet to find out what these four terms mean: Physical Property, Chemical Property, Physical Change, Chemical Change 2. Find and copy 4 pictures to your : 1 showing a physical property, 1 showing a chemical property, 1 showing a physical change, 1 showing a chemical change. 3. Place the images on your wiki page under the heading "**ASSIGNMENT 1: Physical and Chemical Properties and Changes**" and include a 1-2 paragraph explanation like my example below.
 * **ASSIGNMENT 1: Physical and Chemical Properties and Changes**
 * Note: each image is worth 3 points and each correct sentence is worth 2 points for a total of 20 points**.

|| The color of this Monte Carlo is a **physical property**.
 * NOTE: Below is an example to help guide you. However, you must come up with your own new creative idea, images, explanation.**
 * [[image:nahsphysicalscience:1983r.jpg width="308" height="233" caption="1983r.jpg"]]

A **physical change** takes place when the car is painted black. The plastic body of the car is still the same substance after the color is changed. We could even melt that plastic into a liquid, and it would still be the same substance because a phase change is also considered a physical change. See the thing is, as long as the chemical composition remains the same, a chemical change has not occurred.

other physical properties include: size, shape, texture, odor, etc. || || Corrosivity is a **chemical property** of acid rain water.
 * [[image:nahsphysicalscience:acid-rain-2a.jpg width="345" height="345" caption="acid-rain-2a.jpg"]]

When acid rain water reacts with certain metals, a **chemical change** takes place (rusting) and the acid rain + metal forms a **new substance** (rust). Other chemical properties include: flammability, reactivity, pH balance, etc.

Here is the balanced chemical equation showing that Iron, Oxygen, and Water react to form a new substance....rust. 4Fe + 3O2 + 6H2O ---> 4Fe(OH)3 ||