Lab 1-3 Separation of a Mixture

Hey Everyone, from reading your blogs it looks like you are getting the idea for the general outline and purpose of what we are trying to accomplish with the blog. If there are some comments asking you to add to your blog or edit it, please make the changes, your grade will reflect it.

For this experiment you need to write the normal paragraph summary outlining what you did. After you do that you need to consider the following:

1. Compare the amounts of iron, sand and salt that you had initially in your mixture to the amounts that you recovered. Were they all equal? Propose a reason for each of them being different than expected. I won't accept reasons stating that you measured wrong or did math incorrectly. I am looking for problems with the experiment.

2. How could you have made your separation better? For example: if you had sand left in your iron what could you have done to get it out?

3. Explain how you chose how many digits to round your final answers to.

Write a conclusion paragraph explaining how what we did relates to what we are currently doing in class. If you have further questions, this would be the place to ask the questions and address what happened.

Enrichment: Do a little research and find out the steps that are used to manufacture and purify a chemical. The important process here is the purification, because it directly relates to what we are doing in class.

Lab 1-2 Indirect Measurment

First in your blog write a summary of the experiment and your results.

Then: Answer these questions

1.     Some methods for finding the diameters and thickness are much better than others. Explain the limitations of using water displacement and a ruler to calculate the thickness.

2.     When calculating the actual thickness of the foil the number calculated will likely contain a large number of decimals. Can we be confident that this represents an exact measurement? Explain why or why not this is the case.

3.     Suggest some sources of error in how you conducted the measurements that might explain any error in your diameter value.

To conclude your blog entry, explain how you could use a method like the one in your experiment to solve another problem that might not have a clear cut answer.

ENRICHMENT: 

As a person who will soon be paying your way through life, learning to evaluate the “best deal” is an important skill so you can get the most value for your money.  Obtain information about the price and amount of foil in roll of each type of aluminum foil.  Use this information, along with the thickness value for each type of foil, in order to determine which type of foil gives more value.  You may choose to do this by:

a)     showing a mathematical way of figuring this out, OR

b)    describing in writing how you would figure this out. 

Prices:     HD: $3.79 for a roll 70 cm X 6 m

               Regular: $5.79 for a roll 40 cm X 15 m

Lab 1-1: Green Stuff

Ok, now you have completed your first experiment and have had a little bit of a chance to think about it.

The purpose of the lab blog is to do the thought processesing that goes along with the experiences that you had in the experiment.

Your blog post should be outlined as follows:

• A quick summary of the experiment, tell me what you did (a procedure) and what happened (your results). I am usually looking for roughly a paragraph here, you need to provide enough so that I can tell that you understood what you were doing.
• Answers to the lab questions, in this case they are:
• Explain how you can determine if a property of green stuff is a physical property, or a chemical property.
• Describe the different phases of matter of the chemicals (water is a chemical too) used in this experiment. Make sure to tell how solids, liquids and gases are different.

•  Describe how the material relates to what we have been completing in class. Also this is where you can pose questions that the lab made you think about, I like to see this stuff and respond to it.
• Enrichment Questions: I will at times pose enrichment questions, if you want to get 5/5 on all categories all the time, you will need to answer these. For this experiment, come up with an experiment that you would like to try with green stuff. Its name is copper (II) chloride if you want to do a search.

All in all I am looking for 3-4 paragraphs. I will read and respond to you for a grade. I will also be sending you a link so that you can view your progress in a spreadsheet. This will be similar to the one in the syllabus that we discussed on the first day of school.

Welcome to the Mr Evangelos Regent's Chemistry Class

Welcome Back!!!!

If you are checking out this page, then my guess is that you are a student or a parent of one of my 2010-2011 Regents chemistry students. This blog will be used to manage information this year to communicate home and to provide students with information that will help them as the year goes by. Data files will be hosted on my Rush-Henrietta teacher page which I will periodically provide links to.

I usually get asked about class materials this time of year. 

Here is what you will need for chemistry class:

A large 3-ring binder (2 inches usually works, some students have gotten 2 x 1" because it was cheaper or easier to carry around)

A calculator (scientific is best, if you already have one for math, just bring it to chemistry class also)

Kleenex: if every student brought a box at the beginning of the year we would never run out (the school doesn't provide it). If not we end up using paper towels, which are the brown rough type that are not friendly on the sick nose.

Writing instruments, loose leaf paper, normal everyday school stuff.

Contacting Me.

There are two very easy ways to contact me, one is through the phone the other is email:

Phone: 585 - 210 - 2436 (210-CHEM). This is a Google voice number, it can receive and send text messages and also voice calls. Most of the time if you call you will get a voice mail box. I will call back during a planning block, after school, or a time that you tell me is convenient.

Email: AEvangelos@rhnet.org  this is my school email, I answer emails from here promptly. If you have a question don't be afraid to ask.

Information Exchange.

I will be setting up a Google documents account where I can share student progress.You will be able to log in and look to see how you, or your student is doing. This is my first year using this tool, so we might have some bugs to work out but I am looking forward to being able to share information with you easily!!