September 2014 archive

Metals content review – part one

Today in class you will be in a random study group to answer a set of questions about metals and their reactions.
If you did not finish, please try to finish before next Tuesday (Oct 7) when we will discuss them again.

Here are the questions. (Sorry they are sideways.)

On Friday you will collect all your experiment data and analyze it, to make a conclusion.
On Monday Oct 6 you will write your evaluation and then turn in your report.
On Tuesday Oct 7 we will review for the quiz/test, and make sure you understand the material in this unit.
On Monday Oct 13 you have a small quiz/test for this unit.

Born Haber cycles and Lattice enthalpy

Here are some links that may be useful:

A clear definition and example

Some examples linked to data tables for finding delta H values (NB. the lattice enthalpy here is “backwards”)

A nine minute Youtube explanation from another chem teacher

You will have two hand outs from class, plus an activity, and section 15.1 in your text book.

This should enable you to

1. define Ionization, Atomization, Electron Affinity, Lattice, Covalent Bond, Hydration, and Solution. Give an equation to represent the processes.

2. Be able to construct a Born-Haber cycle for group 1 and 2 elements and Oxygen or Chlorine.

3. Show an energy cycle showing Hydration, lattice enthalpy and solution enthalpy. (eg. a Hess’ Law diagram for dissolving NaOH in water)

4. Calculate a missing value in (2) or (3) above.

5. Determine whether lattice or hydration enthalpies will be larger or smaller based on size and charge of the ions involved.

Cooling curve of an unknown

What is that stuff, anyway?

How do we determine which white stuff is which? One way to tell pure substances apart is by their properties such as melting point or boiling point.
In the lab we have a bunch of white substances that are solid at room temperature. Can you tell which one you have?

Here are some instructions for this experiment.

Here is the TSC or rubric for grading this task. This is a summative assessment.

More motion activities in Grade 9

In the next two classes you will complete two activities : one is an online simulation and the other is a live lab with motion sensors, trolleys and ramps.

Here is the link to the motion sensors instructions, and here is the simulation activity.

Pairs for the trolley activity on Monday:
Alina and Ahnaf
Julia and Joe
Megan and Marlon
Krista and Tsuyoshi
Alex and Cole

Pairs for the trolley activity on Thursday
Margot and Mario
Anna and Jem
Sumin and Sukran
Miu and James
Rika and Zerric

Grade 6 Experiments that matter…

Time to practice your Bunsen burner skills!
Here is your first experiment this year. You can download a copy of this document, save it as “Your last name, first Name, Change of state Lab” and then complete the missing parts.

We will work on this in class. You may need to finish your graph at home if you run out of time.

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