Mr. T. Kwan Hung 2003-1-17

Covalent compounds……..?

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Sequence of web pages to view:

Copy (Ctrl-c) paste (Ctrl-V), open another browser (Ctrl-N)... You should open another browser and keep this page open throughout the lesson! Use (Alt-Tab) to switch browsers.

Recall:

A) Ions:

How are they formed?

· http://academic.brooklyn.cuny.edu/biology/bio4fv/page/ions.htm

How many protons(p+), neutrons(n0) and electrons (e-) are there in Na atom?

How many protons(p+), neutrons(n0) and electrons (e-) are there in Na ion?

 

How many protons(p+), neutrons(n0) and electrons (e-) are there in Cl atom?

How many protons(p+), neutrons(n0) and electrons (e-) are there in Cl atom?

Explain in your own words why

 

 

B) Ionic bonds:

· http://academic.brooklyn.cuny.edu/biology/bio4fv/page/ionic_b.htm

 

C) Covalent Bonds

· http://academic.brooklyn.cuny.edu/biology/bio4fv/page/covalent_bonds.html

 

) look at card 27 below:

· http://www.hcc.mnscu.edu/programs/dept/chem/V.12/page_id_54322.html
How is this case different from the previous one? How many e- does Li lose to become Li+? How many e- does O gain to become O2-

)  using webelements:

· http://www.webelements.com
- Click on Mg then MgF₂ on the right hand side of the Mg page…
- Can you tell me why Mg and F have to mix as MgF₂ -that is 2 Mg to 1F?
- Find the compound MgCl₂ on the same site… explain why the formula is 1Mg to 2Cl
 

) using all the resources try to find out the e- configurations of the atoms, ions and formula of the compounds formed for the following:

magnesium Mg and sulfur

AlCl₃ why 1 Al to 3Cl in the formula?
 

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If time permits

) What happens to the Na+ and Cl- in the diagram? Is the end product pure? What is the product called?

· http://www.anselm.edu/homepage/jpitocch/genbio/h20solvent.JPG

) ChemBalancer:  balancing equations

· http://www.dun.org/sulan/chembalancer/

) How are the bonds in the diagram below different from what we learned so far? IS there anything similar in terms of the number of electrons in each case?

· http://www.anselm.edu/homepage/jpitocch/genbio/covalentbond.JPG

) balancing equations

· http://www.chemistrycoach.com/baleq.htm#Balancing Equations by Counting Atoms
 

P)

· http://www.ec.gc.ca/water/en/nature/prop/e_intro.htm

What are some properties of water? How is water used in our world?