In my recent sessions with both Sec 3 and 4 Chemistry Weekly Classes, i realised that Chemical Bondings is one of the key basic topic that many students are having problems in understanding and scoring in their Chemistry tests & exams.
Chemical Bondings comprise of the following sub-topics:
- Ionic Bonding
- Covalent Bonding
- Metallic Bonding (not in Combine Science syllabus)
and examiners will be looking out for specific keywords from students.
There is this tendency that students used the wrong keywords associated with one type of bonding for another type, or miss out on keywords to score the grades they truly deserve in this basic Chemistry topic.
Let’s take a look at one of the exercises that i have recently gave to my Sec 4 GCE-O Level Chemistry Class.
Example 1: Student A
Remarks:
For Part (a)
1. Student do not know what to write in order to obtain the 2 marks in Part (a) of the question. He actually wrote a few lines of redundant information in which the examiners will not give him any marks for.
2. He will get 1 mark for mentioning that [Read more…] about O Level Chemistry: Common Errors on Ionic Bonding