December 2014 archive

Grade 9: Bonding of atoms

This unit is a chemistry based topic.
We can understand how substances behave by knowing how they are held together. Atoms are held together with bonds. There are three main types of bonds we will look at: Ionic, Covalent, and Metallic.

What are atoms, what are they made and how can we rearrange parts of them so they can make connections?
Here is a simulation from pHet: Build an Atom You will need to download and run it.

Here is an overview of ionic bonding from the BBC. Here is a video if you prefer to listen.

Practice naming ionic compounds (can click only “binary compounds” to start)

For later in the unit:
Here is the overview of covalent bonds. Also there is a video/interactive clip about covalent bonding here.

Some information on metals is on this page.

More bonding fun for gr 11 Chem

Some good links to specific information for the rest of this topic:

Some notes on Covalent bonding in general

About allotropes of carbon

The youtube clip about finding the structure of C60

Carbon and ‘network solids’ video from Crash course. (Giant molecular structures, plus some more interesting information)

Some nice Intermolecular forces notes are here, but note that we now call the VanDerWaals forces “London dispersion forces”. Also: Non polar and polar molecules and Intermolecular forces video from a slower speaking chem teacher…

A cool pHet simulation about molecular polarity is here.

What do you do if the Lewis structure is not what you actually observe? A model to try to explain what happens in SO3 and O3 and benzene rings is “Resonance”. Read about it here.

Metals and bonding video is here.

Basic review questions

IB review questions here

IB review Answers here

How are atoms attached to each other? Why does it matter?

Topic 4 (and 14) is bonding.

We are looking at Ionic, Covalent and Metallic bonding, and why the type of bonding makes a difference to the properties and behaviour of materials.

Here is a set of introductory slides on the topic of Ionic and Covalent bonds.

Here is a video on types of bonds from Crash course.

Here is a worksheet on using dot diagrams and forming ionic bonds, and are some questions about understanding Ionic bonds.

Here is a video from Crash Course on Lewis structures.
Some worksheets on drawing Lewis structures : first one, second, third.

More will follow.

Grade 9 cells and plants wrap up

Here is a link to the practice questions you got in class, with the answer key attached at the end of the questions.

Answer M1 is for Q1, M2 for Q2, etc.

Read your folders and labs over again too please. Revise the microscope material from the beginning as well.