Redox reactions and electrons on the move

Redox reactions – basic notes and information document

Here is a link to the Khan academy video on balancing redox reactions in acidic solutions using half reactions. You may notice on the left of the page that there are other related videos there… we do not need to do this in basic solutions in this course.

https://www.khanacademy.org/science/chemistry/oxidation-reduction/redox-oxidation-reduction/v/balance-and-redox-reactions1

Here is a simulation on Electrochemical cells where you can change the metals used and measure voltage

and another one here with some questions. It requires flash.

 

Monday Feb 13th Chemistry class – Trends on the PT

Today you need to determine the meaning of :

A) Metals, non-metals, metalloids, Halogens, noble gasses, alkali metals, alkali earth metals, lanthanoides, actinoides, s-block, p-block, d-block, f-block

B) Atomic radius, ionic radius, ionization energy, electron affinity and electronegativity

For group A, determine where these are on a PT and mark them.

For group B, determine what the trend in these values are along a period and up or down a group, with a reason. Label the trend on the PT.

To think about, and answer (may require some looking up of information!) :

  1. why is the trend in atomic radius not the same as the trend in ionic radius?
  2. what are the differences/similarities between electron affinity and electronegativity?
  3. why do different sources disagree on which elements exactly are metalloids (sometimes called semi-metals)?
  4. what are alternate periodic tables? Why do scientists make them? Which one(s) do you like?

Chemistry fun with Ionization energies, Feb 6th

In class Feb 6, we looked for any misunderstandings or problems with material in 2.1 and 2.2. We were going to talk about mass spectrometres and isotopes and calculations but 8 people are away, so we’ve saved that for Wednesday Feb 15th.

Today we did this activity on patterns in Ionization energies, and why that is evidence for the organization of electrons. If you are not here, you should do it!

Our next lesson, on Feb 13th, we will talk about trends in the periodic table, discussed in 3.1 and 3.2 in the text.

All about electrons – starting with atomic structure

Some helpful or interesting links for 2.1 and 2.2

2.1

Simulation of Rutherford’s Gold experiment  https://phet.colorado.edu/en/simulation/rutherford-scattering

All about the nucleus, Bohr, etc in 10 minutes of fast talking from Crashcourse, get past the general chem first   https://www.youtube.com/watch?v=FSyAehMdpyI&list=PL8dPuuaLjXtPHzzYuWy6fYEaX9mQQ8oGr&index=1

 

Website (text) with More than you perhaps want to know about the operation of a mass spectrometre, but interesting http://www.chemguide.co.uk/analysis/masspec/howitworks.html

… and then how to use the information from a mass spectrometre to calculate ram  http://www.chemguide.co.uk/analysis/masspec/elements.html#top

Video (7 min) on mass spectrometry and how, why we use it https://www.youtube.com/watch?v=mBT73Pesiog

Topic 2.2

Models of the H atom sim How did scientists figure out the structure of atoms without looking at them? Try out different models by shooting light at the atom. Check how the prediction of the model matches the experimental results  https://phet.colorado.edu/en/simulation/hydrogen-atom

More history of atomic discoveries/models through the ages  https://www.youtube.com/watch?v=thnDxFdkzZs&list=PL8dPuuaLjXtPHzzYuWy6fYEaX9mQQ8oGr&index=37

Video on Light and atomic structure  http://www.learner.org/courses/chemistry/video/unit3video.html  (also has a link to the video transcript, if you’d like to read along)

Document from my drive on Electromagnetic spectra (in detail) https://drive.google.com/file/d/0B_gNjaR3kKGjSlpHNGhMUDBkNk0/view?usp=sharing

5 min clip on atomic emission spectra (from Brightstorm series) http://www.brightstorm.com/science/chemistry/the-atom/atomic-emission-spectra/

Do you wish you could see spectra at home? Clip of atomic spectra with home materials (optional)  https://www.youtube.com/watch?v=SdpY53AWCvY

Tuesday Jan 17, chem class

Please tidy your stuff before you go for lunch  as there is a meeting in this room at lunch time.

Students can

  1. Work on exploration if not done.
  2. Peer review their work with each other for feedback. Read someone else’s work and grade it using the IB rubric (for another rubric to use see Google + community and show Mirai where it is!) , and go through Explorations with the checklists you made last week.
  3. HL students can (should) read and take notes on section 16.2 in text book, try problems in the section from the textbook.
  4. Practice vocabulary and definitions for any unit completed so far
  5. Practice stoichiometry with these questions from past papers * remember you haven’t finished course yet  https://drive.google.com/file/d/0BzSpikEq6bX5d3oxTG53TDZFcHM/view?usp=sharing
  6. Answers are here (no peeking before trying though) 

Wednesday Jan 11th class

  1. Open and review Exploration document you created last class

2. Look over your list of experiments and labs on energetics and kinetics. THink of reactions or situations where you would like to control the timing of the reaction.

3. Do some research on the internet and in the lab books from M313 (ask a student to collect them from Ms. WInslade in M313) and find an experiment related to kinetics (or energetics if you can’t find anything related to kinetics) that you think would be interesting and that you could adapt to something local/personal.

A classic example is making a clock reaction and finding how the timing varies with concentration of one reactant, to make a calibration curve so that you can ‘set’ a reaction to change colour at exactly a particular time, so that a series of reactions can be set to change colour in time to a piece of music.

4. After you find an interesting experiment, you need to find THREE reliable methods. Read them. Try to picture what they are saying to do. Think about the quantities.

5. Choose and determine your variables (Ind, Dep, and controls) (This may involve some research, and maybe looking at equipment or trying some things (like, how much water fits in one test tube?)

6. Decide what you would likely do, with reasons (think of safety, environmental issues, good number of trials, etc)..

7. Now, write your EXPLORATION only.

Sources must be given in MLA format. (sources for background, methods, and anything else you look up, eg. background chemistry of the reaction).

You have this class and next class to do this task. You need to finish your exploration at the end of next lesson. You should attach a copy of the list/plan you came up with in your group for “what makes a good Exploration” so that I can see you used it. 

You can share it with me on a google doc.

DP chemistry class Monday Jan 9th 2017

Welcome to Chemistry at YIS, Mirai! I am sure the class will make you welcome and help you find an HL text book (at the back of M313 or M 310). I am sorry I am not in school this week.

Reminder: Test on Material so far (topics 1, 5, 6, 11.1, 11.2 plus 15, 16 for HL) coming soon.

What to do today:

Task one: (5 minutes)

From Energetics and Kinetics topics, think of all the experiments and demonstrations. In a small group or pair, make a list on a white board. Look around at others and add to your list as needed. Take a photo to keep for next lesson. Think about these topics while you complete your work today. 

Task 2: (about 20-25 minutes)

What is the IA criteria “Exploration” looking for?

Read the Criteria, and some of the information about it from the IB.

Individually, read the three lab reports posted here and, using the rubric on the Criteria sheet (above), assess each one for the Exploration criterion.

Lab 1

Lab 2

Lab 3

Task 3:(about 20 minutes)

Find a triplet (get in groups of 3) and compare your assessments of all three reports. What did you agree on/disagree about? What did the students do well? What not so well? What is missing/could be done differently?What is really good and worth doing again/keeping? 

(Remember for this task, you are only considering the Exploration part of the report). 

Task 4: (10 minutes)

In your group of 3, make a list of what should be in a good Exploration. Make it clear and concise. It can be a checklist, a TSC, a diagram, or any other format that is helpful. 

Task 5: (15 minutes)

Discuss as a class and record (can someone please volunteer to record) the class list/summary of what should be in a good Exploration (on the board? Using a google doc?) Make sure everyone gets/can access a copy.

(Here is a version we used in previous class, if you would like an example of what it could look like)

You will need to use this next class.

Remainder of the time:

Work on review material.

Choice of Textbook questions at the end of topics 1 (except gasses), 5, 6, 11.1 or 11.2,  or HL 15 or 16.1

Also try any of:

Reading and summarizing this SL kinetics note (some problems included)

The questions on rates of reactions from long ago that you may not have done, and the answers

quizlet for vocabulary review

 

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