September 30 ChemThink in class

In the class of September 30 we met in the science computer lab. We worked on two ChemThink's. One was entitled Atomic structure, and the other Ions. Like always you log on and read the tutorial before doing the questions related to it to be able to answer them best. Below are some notes that I found helpful for the ChemThink questions.

Atomic Structure

• Proton

1. +1 charge
2. Heavy mass
3. Inside nucleus
4. Determines identity of atom by the atomic number

• Electron

1. -1 charge
2. Virtually 0 mass
3. Outside of nucleus
4. Responsible for reactivity
5. Constantly in motion
   

• Neutron

1. 0 charge
2. Heavy mass
   
3. Inside nucleus
4. Holds together nucleus

Atomic number=The number of protons found on the periodic table
Neutral atoms= Same number of electrons as protons

Ions
Ions- individual atoms or groups of atoms that have a charge

1. Ions are formed when, at certain times, atoms gain or lose one or more electrons.
2. (-) ions can only be formed by gaining electrons.
3. (+) ions can only be formed by losing electrons.
4. Protons are never gained or lost when ions are being formed.

Black Box Lab

Today as we walked into class we picked up 25 pieces of paper which we will be using for most of our new unit. However we did not use any of them. If you didn't finish the lab test retake then you had ten minutes to finish up but if you were done you began on the Black Box Lab.

In the black box lab, Mrs. M had set up 12 black obsertainers that each had it's own unique design on the inside. Each obsertainer had a metal ball bearing in it and you had to figure out what each obsertainer looked like on the inside by the moving it around and listening to how the ball bearing moved inside of it. After you had finished recording you results, we were told to start a work sheet we were giving about the scientists who discovered the atom and it's many purposes. You were supposed to have at least finished the section about Dalton by the end of the period.

The only homework for the night is the webassign which will be due at the end of the unit.

-Greer J.

Lab Test Take Two

    As we walked into class today we picked up four pages to put into our notebooks. The first two were all about Unit Two: Atomic Structure. It had the Unit 2 Objectives and Schedule on them. The second two pages were a "Black Box Lab" which we did not get to today. 


   After the class got settled Mrs. M handed back tests. The class average was around 83%, good job everybody! We went over the tests and handed them back to Mrs. M. You can come in and see them before finals if you would like. Other than that, they're Mrs. M's to keep. We were also given grade sheets today. All grades besides the lab test were on there.


   Our lab tests didn't turn out quite so well. In fact, we re-did the write up today in class. Nobody got a grade on the original sheet we handed in. Instead, we filled out a new packet using the calculations from our original lab. If you didn't finish in class today you should have put a star on your paper and you will be given about 10 minutes tomorrow to do it in class. Hopefully things go better this time!
  
  If you missed the Chem day on Friday Mrs. M will assign you problems to do from the book to make up for it. If you would rather look up the episode (helium footballs and catching a bullet in your teeth) online and take notes, that will also be accepted. 


-Molly C.-



 

To float or Not to float? Or sink less than 3 seconds

If an irregular object floats on water, we can immediately conclude that it is less dense than the water. Yesterday we had a lab where we must make an irregular object sink as slow as possible. It was a hard thing to do for we have to go through a calculation that most or some of us were having trouble with. Thank goodness our irregular object was sinking for 1.2 seconds. .2 longer than I predicted. I was amazed to what I have seen. Tomorrow we will have a Written Test. REMEMBER TO BRING YOUR JOURNAL TOMORROW. She will collect our journal and hand it out during or after class.

Chemistry Basics Review

Tuesday, September 21, 2010

When I first walked into the classroom today, Mrs. Mandarino began in the usual manner of stamping homework, and she began with the review in the journal, of course. Mrs. Mandarino demonstrated us the correct ways to draw molecular and pure compounds, even in the cases of before and after a chemical change. We went over physical and chemical changes, and we even reviewed a handy helping of density equations. The unit conversions took a while to get through, but it all managed to come together when we did sig figs and scientific notation. We even got through precise measurement. Overall, today was not the most interesting of days by far, but it really managed to help a lot of people who were struggling with certain types of problems. A simple review day, to say the least. But at the very last moments of class, the teacher described the contents of the written lab we had to do on Thursday. Apparently, we were each assigned a partner for a glass vial lab. We had to fill a glass vial with sufficient amounts of gravel in order to sink to the bottom slowly, but not float. And there is no homework, aside from studying for the big lab test tomorrow. Durrr!




Dragomir O.

Yesterday in class, the first thing that happened was Mrs. M doling out a healthy dose of admonishment for the neglect in lab hygiene and safety on the parts of periods 5 and 8.  Mrs. M then called us all up to the front of the room to stamp the labs we did on Friday.   I think that we then went over pages 16 and 17, but I'm not sure.   Mrs. M was handed out a review sheet for chapters 1 and 2, and passing back the quizzes that we took on some previous occasion.  We then discussed the upcoming "Sinker Project" that is to be carried out on Wednesday.  We will each be assigned one partner to work on this project.  A graduated cylinder, a vial, and some pebbles will be provided to each pairing, with the goal to made the vial sink as slowly as possible in water.  Bear in mind that water has a density of 1g/cm^3.  I think that we might have done some other things, and I'm not sure if any homework was assigned, but I sure hope there wasn't.
-AvK-

9/16/10 Physical/Chemical Properties and Changes

In chemistry class today, we first got page 17 and the physical and chemical stations sheets to put inside our journals. Right after we finished taping in the sheets of papers that we had received, Mrs. M started on page 13 of our journals. We learned about substances and compounds and atoms. We also learned a way to memorize Diatomic elements: HONCl BrIF. Which means, H2, O2, N2, Cl2, Br2, I2, F2. After we moved on page 14 and we learned all about pure substances, pure substances are substances that only contain one kind of manner. Then we moved onto page 15. We learned how to right formulas and to draw out formulas of what the page told us to do, and right a description of it. After page 15, we took notes on Physical Properties, Chemical Properties, Physical Changes and Chemical Changes.

Physical Properties

• characteristics you can observe (descriptive)

• use your senses

1. color
2. size
3. shape
4. texture
5. state
6. odor/smell

Chemical Properties

• the way a substance will behave

1. flammable
2. combustible

Physical Change - do not permanently change the substance

• tearing
• crushing
• bending
• dissolving
• state changes --->solid--->liquid--->gas
• melting

Chemical Change - substance is permanently changed

• digestion
• burning
• rusting

Evidence that chemical change has occured

• color change
• odor change
• production of heat
• production of gas
• sound and light show

• bonds break, atoms rearrange, new bonds form

The homework is to finish page 16 in your journal and do the webassign and chemthink

-Taso K