In one of the question in the recent examination, one question asked about the meaning of the rate of reaction. I compiled the answers from one of my class. The following are their answers:
- Change amount of reactant or product against time
- Change in the amount of reactants against product formed
- Change of selective quantity of product or reactant against time
- How fast the reaction occur at particular time
- How fast reaction takes place in a reaction
- Measurement of the amount of change of reactant or products against time taken
- Rate of formation of product over time
- Rate of substance to react with solution
- Speed of a chemical reaction
- Speed of reaction of a substance in one second
- Amount of reactant that has been used up or the product that is formed in a unit of time
- The amount of product produced in a reaction to time
- The amount of products formed in a reaction per time
- The amount of reactant over a time
- The amount of reactant used up or the amount of product obtained per unit time
- The measurement of the change in amount of reactant or product against time
- The rate of change of reactant or product over time
- The rate of time that a substance is able to react completely with another substance
- The time taken for a reactant to react completely
- The time taken for the reaction occur
- Time for reactant to react to produce product
- Time or the speed of reaction to take place
- Time taken for the amount of reactant react to produce an amount of product
- Time taken for the reactant to be reacted
- Time taken needed for the volume to undergo chemical changes
NONE of them gave the same answers. Each of them has different understanding of the definition of Rate of Reaction. But most of them have misunderstood the term! Only answer 3 give an accurate definition. What a pity! Perhaps some of them did try to memorize during revision, but memorizing without understanding is not effective at all.
Let's have a look, what can I do to clarify this when I enter their class later.
Johan: Tan Ying Li, Tan Yi Han, Pavittrah a/p Mohanan
Naib Johan : Nurul Huda bt Azhar, Nursharina bt Mohd Yusof, Kharun niza Waznah bt Baharin
I received many entries from students during Minggu Sains & Teknologi 2010. To my surprise, my students are not only good in their chemistry concepts, they have talents to in arts too! Keep up the good job!
Based on the structure for both fat molecules,
- Which molecule is a unsaturated fat molecule? Why?
- Which homologous series does molecule A belong to? Why?
- State two difference of both molecules.
- Which molecule can undergo catalytic hydrogenation? State the condition of the reaction.
I found this document from Scribd posted by khayranizam. It is useful for revision as the notes are compiled in the form of mind map.
More module on
Rate of reaction
Manufacture Substance in Industry
In my today lesson with form 5 students, I discussed the conversion of Fe2+ ion to Fe3+ ion by using oxidizing agents and conversion of Fe3+ to Fe2+ ion by using reducing agents. To my shock, my students were hardly name any chemicals used to test the presence of Fe2+ ion and Fe3+ ion.
Some students complained that is hard to remember the facts. Some would said that they didn't carry out the test when they were in form 4. I'm wondering, any students instead of blaming others, being proactive thinking ways to remember the facts? So far, some of ex-students creating stories(huh? story on chemistry facts?), songs, pneumonics, colourful notes with diagrams/mindmap to remember this. They ended up enjoying the fun of learning.