Mole Concept - Word Search

For those who are too boliao, you can test your understanding of mole concept here!


Puzzle from Oklahoma State University
Enjoy!

p.s. why is the molar gas volume different from ours? I thought it should be 24 dm3? Do not be confused ok!

Balancing Equations

Yoz,

Here's some websites for you to practice the balancing of equations.

You get to check if you have gotten it right immediately.

Notes and Exercise: http://richardbowles.tripod.com/chemistry/balance.htm
Exercise: http://funbasedlearning.com/chemistry/chemBalancer3/default.htm
Exercise: http://www.chem.vt.edu/RVGS/ACT/notes/scripts/bal_eq1.html


Picture from Edventure.com

Accolades

Hi, all,

This is the ranking as of present (38% of RP CA and 25% of RA CA is done).

Congratulations to all.

Chemistry - It's so Fun

Hi,

Still can't distinguish elements from compounds after mugging for hours now? Don't fret, go take a look at Elementeo, a card game created by a 14-year old CEO. (Related article here)

Take a break from all the mugging.

Best wishes!

Picture from Elementeo.com

Announcement: CCT 1

Yoz,

The real test has arrived. The CCT 1 for Chemistry has been scheduled to be done on 14 Apr (Mon).

The topics tested are:

- Particulate Nature of Matter
- Experimental Design and Purification Techniques
- Atomic Structure (including spdf subshell)
- Chemical Bonding (only ionic and covalent bonding)

Ganbatte!


Picture from Art.com

RA students to refer to the RA Forum for more details of your CCT 1 which would be held on the same day.

Am I hearing you rite, Ionic Liquid??

Hi, guys,

As we have studied in our class, ionic compounds are usually solid. Why?

Long pause.... cos ionic bonds are strong rite!!! Because ionic bonds are strong, large amount of energy is needed to break these bonds in order to turn the ionic solid into liquid state.

Now, not all ionic compounds have high melting point. There are actually things called 'ionic liquids'. As the name implies, it is an ionic compound but is also in liquid state.

How is that possible? Again, it has to do with the strength of the ionic bond. In ionic compounds where there is a large difference in the size of the ions (i.e. one big ion and a small ion), the ionic bond would be weaker. Hence, this results in the compound existing in liquid state under room temperature.

Now, these ionic liquids are useful stuff. One of the latest application is to use it as a substitute for mercury and alcohol in thermometer.

Read this for more info.

Enjoy!

Picture from Chemical Technology

Diamond vs Glass

Hi, guys,

Thought about this question on the way to school this morning....

Since you are currently working on the 'Structure and Bonding' e-learning (or at least I imagine you are), you would know that Diamond is hard because all C atoms are ______ and _____ bonded to each other. Since covalent bonds are _______, _____ amount of energy is needed to break them and hence diamond is hard.

Now, we also know glass has a similar structure, though not exactly. Now, the question is, why diamond is hard while glass shatters?

Interesting question rite? Do discuss in the comments....