Atoms, their properties and how they are bonded together

Understandings

● Positive ions (cations) form by metals losing valence electrons.
● Negative ions (anions) form by non-metals gaining electrons.
● The number of electrons lost or gained is determined by the electron confi guration of the atom.
● The ionic bond is due to electrostatic attraction between oppositely charged ions.
● Under normal conditions, ionic compounds are usually solids with lattice structures.

Applications and skills

● Deduction of the formula and name of an ionic compound from its component ions, including
polyatomic ions.
Guidance
Students should be familiar with the names of these polyatomic ions: NH4+, OH–, NO3–, HCO3–, CO32–, SO42–, and PO43–
● Explanation of the physical properties of ionic compounds (volatility, electrical conductivity, and
solubility) in terms of their structure.

Additional Resources

Periodic table

Bonding by Magnus Drechsler

Chemical bonding overview videos

Check out the video and learn from your peers
Want to add your video?
Use this access code - chemsitry8materials

Innovation: Demonstrating understanding on chemical bonding in innovative ways

Task:

Get in groups of 2 or 3 students (also able to complete this activity on your own)
Use the overview mindmap and Flipgrid videos, as well as the internet to research ionic and/or covalent bonding
Think about and discuss innovative ways to explain what ionic and covalent bonding is (see the videos below for some ideas like song or animal role play)
Plan your own innovative ideas and produce your video
Post your video on Flipgrid - access code: chemsitry8materials

Examples of Songs

Role play (even with animals)

Student Practical: Growing your own crystal - ionic bonding

Task:

Watch the video instructions
Get in groups
Collect copper sulfate powder
Adjust the method illustrated in the second video according to the amount of copper sulfate powder that you have - Be sure to leave extra copper sulfate to add to the solution from time to time during the time that the crystal is growing
Follow your adjusted method and grow your own crystal
Video record your process of growing your crystal and include any advice from your experience
Post your video on Flipgrid
Peer assess other groups on Flipgrid - access code: chemsitry8materials

Polyatomic ions quiz - Kahoot

Teacher access to use quiz in class

Ionic bonding and ionic compounds

Task:

Watch the video and take notes
Complete the exercises in the videos as you watch
Test yourself by taking the quiz below:

Access markbook to see your students results

Ionic bonding

Ionic compounds

Dots and Cross diagram

Task:

Watch the video and take notes
Complete the exercises in the video

Physical properties of ionic compounds that reflect the lattice structure

Task:

Get in 4 groups
Select a property that your group is going to be focusing on from the following 4 options:
1. Melting and boiling points (Pearson textbook page 145)
2. Solubility (Pearson textbook page 145-146)
3. Electrical conductivity (Pearson textbook page 146)
4. Brittleness (Pearson textbook page 147)
Research your property that you have selected using the textbook and other sources
Discuss your research in your group
Add all of your findings and discussion points with diagrams and pictures