Happy Halloween

Happy Halloween

Today's online activity is a Halloween grab bag of fun...use the links on the page below to earn a yummy, bloody body part treat from my coffin of gore...

http://docs.google.com/Doc?id=dc39nfhs_284c73v98dq

Timelines and Life on Earth

Today in class we reviewed the online assignment from Thursday and Friday. There are 4 key concepts that we can take away from this assignment
1. The Earth has changed in its 4.5 billion year history and we need to understand these changes if we are to understand how life has evolved on the Earth
2. There are some living things that have remained unchanged for billions of years
3. There are some living things that became extinct after millions of years
4. The diversity of life increases as we move forward through time.

We then talked about the characteristics of living things

There will be a quiz on the timelines and on the characteristics of living things on Thursday.

Origins of Life Websearch

You have had the opportunity to create a timeline showing the beginnings of life on Earth. Today we are going to look at the characteristics of life - and examples of life from each time period. We will be using THIS WEBSITE The science that we are studying is called PaleoBiology.

Here is the assignment to go with it - you can do this as a hard copy or write the info in your notes or create your own word doc with the answers.

October 20 AND 21

We are creating timelines of Earth showing key developments in the origin and evolution of life. Students may use their book or online book to help with this.

Your assignment today is to learn more about the history of Life on Earth. You may choose one of four ways of doing this:

Choice Number 1 – create an illustrated timeline of event in the history of life on Earth using two sheets of plain paper taped together side by side longways, colored pencils and your textbook.



Taped papers

For the timeline:
Start with 4.6 billion years ago - page 423 – top of 424
Then p. 426
Then p. 427
Then p. 428
Then p 429-434

For each time period – you should write the date (in billion years ago, million years ago or thousands of years ago) write a short description of what Earth was looking like and what life -or conditions for life was looking like. Include any key events that occurred during the time period (for example mass extinction)

Choice Number 2 – Make a comic book about key events and types of life over the history of Earth – using pages 423, 424, 426-434. Use plain paper, colored pencils and the textbook

Choice Number 3 – Write a short story about a biologist from the future who is sent backwards through time back to the beginning of Earth to collect samples of life and the molecules that might have lead to life beginning on Earth. Include key events and dates for each time period.

Choice Number 4 – Think of your own way to show or describe the history of life on our Earth using pages 423-434 in the textbook and your online packet from Friday as a reference.

Timeline of the Earth

Today we are looking at the timeline of Earth's history. We will be making a model of this with toilet paper next week - yes I said toilet paper.

Use THIS LINK to complete the packet for today.

Origins of Life

We are beginning a new unit that will exam how life first began on Earth, basic cells and how scientists classify life and use the fossil record to look at our past.

Here are the classnotes from today

Introduction to Life On Earth

Tomorrow we have a test on macromolecules - proteins, carbohydrates, nucleic acids, lipids and pH. It is a closed not test. I will be checking notebooks. The following should be in your notebook:
Notes on Lipids
Notes on Proteins
Notes on Carbohydrates
Notes on Nucleic Acids and RNA code activity
pH notes
pH lab
Molecular behavior - solubility
Solubility lab
Molecular behavior - bonds
Balancing equations
Microscope History
Microscope intro lab
Scientific method
Mentos lab notes
Molecule cut outs

There is a lecture this Thursday evening at the Cleveland Museum of Natural History on Astro Chemistry that ties directly to what we will be discussing in class this week. If you attend the lecture, I will give you credit for 2 Research Journals.

October 10 Fat Friday Assignment

Today we finish up our week of molecules by looking at LIPIDS. Remember that next Tuesday we have test on molecules and pH.

Macromolecule Week

This week we are working on macromolecules. Tuesday we learned about Carbohydrates. Wednesday we focused on Nucleic Acids. Thursday we will be studying Proteins and Friday we will be doing an online activity about lipids.

Links about macromolecules
http://www.sci.uidaho.edu/bionet/biol115/t2_basics_of_life/lesson2.htm#Macromolecules

Links about Carbohydrates
http://www.nutramed.com/nutrition/carbohydrates.htm
http://www.chem4kids.com/files/bio_carbos.html



Links about Nucleic Acids
http://www.chem4kids.com/files/bio_nucleicacids.html
http://learn.genetics.utah.edu/content/begin/dna/transcribe/
http://genetics.gsk.com/overview.htm

pH Lab October 4

We will be experimenting today with pH using a natural indicator.

Organic Molecules and pH

Tomorrow we are going to be doing a pH lab using an indicator made from Red Cabbage. Here is a quick video about pH. Today you are going to do an online interactive to learn more about pH. By the end of the period, you should be able to explain what pH is, how it is measured and the difference between and acid and a base. When you are done, you may work on your project which is due tomorrow or a research journal - which is due today.

Part 1
Define pH In the lab section of your notebook, write down the definition of pH and give an example of an acid, neutral and base. Use the following information to write a definition in your own words.

pH
Under the Brønsted-Lowry definition, both acids and bases are related to the concentration of hydrogen ions present. Acids increase the concentration of hydrogen ions, while bases decrease the concentration of hydrogen ions (by accepting them). The acidity or basicity of something therefore can be measured by its hydrogen ion concentration.

In 1909, the Danish biochemist Sören Sörensen invented the pH scale for measuring acidity.A solution with [H⁺] = 1 x 10^-7 moles/liter has a pH equal to 7 (a simpler way to think about pH is that it equals the exponent on the H⁺ concentration, ignoring the minus sign). The pH scale ranges from 0 to 14. Substances with a pH between 0 and less than 7 are acids (pH and [H⁺] are inversely related - lower pH means higher [H⁺]). Substances with a pH greater than 7 and up to 14 are bases (higher pH means lower [H⁺]). Right in the middle, at pH = 7, are neutral substances, for example, pure water. The relationship between [H⁺] and pH is shown in the table below alongside some common examples of acids and bases in everyday life.

	[H+]	pH	Example
Acids	1 X 100	0	HCl
	1 x 10-1	1	Stomach acid
	1 x 10-2	2	Lemon juice
	1 x 10-3	3	Vinegar
	1 x 10-4	4	Soda
	1 x 10-5	5	Rainwater
	1 x 10-6	6	Milk
Neutral	1 x 10-7	7	Pure water
Bases	1 x 10-8	8	Egg whites
	1 x 10-9	9	Baking soda
	1 x 10-10	10	Tums® antacid
	1 x 10-11	11	Ammonia
	1 x 10-12	12
	1 x 10-13	13
	1 x 10-14	14	NaOH

Part 2 Explain how the number of Hydrogen ions changes as the pH number changes. Use this site to help you pH and the power of 10

Part 3 Explain why acids and bases act differently when they are added to water. Hint - think about H ions and OH ions. Use this site to help you pH and water