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| View Larger Image | Framework Molecular Model Student Kit | Hardcoverby Brumlik (Author)
| List Price: | $50.40 | | Price: | $38.07 | | You Save: | $12.33 (24%) | | | Available: | Usually ships in 24 hours |
| | Binding: | Hardcover | | Publisher: | Prentice Hall | | Publication Date: | February 25, 1965 | | Sales Rank: | 577,243th |
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EDITORIAL REVIEWS |
Product Description
Framework models built from the FMM set show to scale the mutual relations of atoms in a molecule. The molecular framework is specified by internuclear distances and accurate bond angles. Multiple bonds and pi orbital systems are designated using special connectors. *features only two basic components - metal valence clusters (tetrahedron, trigonal, bipyramid, and octahedron) and plastic tubing - that allow the representation of any atom of the periodic chart. *metal valence clusters define bond angles precisely and can be adjusted to construct models of molecules with unusual bond angles. *color-coded plastic tubing enables clear identification of atoms. *2-color tubing of univalent atoms bonded to other atoms shows univalent atoms with correct covalent and van der Walls radii. *shows molecular orbitals and electron pair orbitals. *components are easy to assemble and are reusable. *includes a separate booklet of instructions and a carrying case. |
CUSTOMER REVIEWS (Average Customer Rating: 4.0 based on 6 reviews)
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Helpful Kit, But Case Has Design Flaws by Mark Hurst (Arkansas, USA)  3 Stars
October 02, 2009
This kit is a must for any first year organic chemistry student. I liked having the different colored straws representing the different atoms. The things I disliked about this kit is that you have to cut the straw lengths yourself and hope you don't make a mistake. Second, there is no "jack" for sulfur atoms. Lastly, the kit is not designed to house the final cut straws properly and it is not designed for portability. You need to keep some sort of rubber bands or clamp on the plastic case to keep the lid from coming off; terribly designed, but very helpful in the long run.
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old, but very useful - does what other models do not by Margaret Pellegrini (Rochester,MN)  5 Stars
November 01, 2008
I have the 30 year old predecessor to this set and it was very useful then. It is very useful again since I have been teaching Chemistry to middle school students and investigated other model systems, but no other modeling system enables people to build models of double and triple bonds which represent the theoretical regions where the electrons are found. Thus, my students have been using the old kit and I have been buying more kits.
Essentially, for a single bond, you just connect the atoms with single tubing to represent the sigma bond. For a double bond, you build a framework above and below the single bond to represent the area where the second pair of electrons would be found in the pi bond. For a double bond, you build a second framework in front of and in back of the single bond for the second pi bond.
These bonds are #1 straight and #2&3 a square, but the electrons move around in a "cloud" around the straight or square tubing. When I demonstrated this with my students, I made "clouds" out of construction paper and attached them to the tubing to show the actual distribution, but it basically follows the tubing. You can't show the distinction between the sigma and pi bonds using any other modeling method that I have found.
Space-filling models don't show a nucleus, but the nucleus is obvious with this set: it is the "jack" where the tubes come together.
If you are serious about representing the actual relative sizes and bond shapes, this is the modeling set for you.
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Deceptive packaging by Chemy (Toronto)  4 Stars
January 11, 2007
This is not a space filling molecular model set like the picture on the box implies. What you get is a set of jacks and plastic piping like the straws on juice boxes. A model built from this kit looks like a tinker toy. Still, I found the kit extremely enlightening.
The jacks represent the different geometric shapes that single bonded, double bonded, and triple bonded atoms configure into - tetrahedron shapes, bi-pyramidal shapes, and octahedron shapes. You have to cut the different coloured plastic tubes with an exacto-knife to given lengths which represent the radius of the atom you are working with - a black tube is cut to 1.67 inches to represent one radius of a single bonded carbon atom. This attaches to a jack, which is the connector, and you attach another length of tube to another prong on the jack for the atom which is bonded to that side of the carbon - it could be a red tube for oxygen.
The set required me to do research into advanced structural concepts of atomic bonding - i.e. - sp orbitals, sp2 orbitals, sp3 orbitals - and has lead me to an area which I can research in more depth later. In this way it has been very enlightening.
Although this set is not what I expected or wanted, I am glad that I ended up with it because it has revealed in a very simple way the complexity of moleculare structure and has taught me a lot about quantum mechanical structure of molecules.
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Molecular Model by Alexandrina O'garro 5 Stars
May 27, 2006
Shipped promptly. Received in excellent condition, and earlier than expected date. Packaging very secure. Model will work well with class. Highly recommend.
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Seems very cheap by MLD  1 Stars
January 22, 2006
I got this two days ago, which is not really long enough to effectively judge its usefulness to the course, but I already have some definite opinions. First, the picture given implies that this is a space-filling model kit, which it is not. You are given a series of tubes and connectors, representing bonds rather than atoms. This has potential to be very useful, but it was not quite what I was expecting. The tubes, are all one length, and must be cut to the appropriate size using the included scale. Double bonds are depicted only by bond length, not visible double bonds, which is rather confusing visually. Most annoying, though, is the metallic coating that represents carbon, nitrogen or oxygen bonded to hydrogen. These colors flaked off immediately when I built the first model, sticking to my hands and making my ethylene a model of impossibly bonded hydrogen, as it went from black to white. I'm ordering the Prentice Hall kit, though I am keeping this one should the rumors that this is the only way to build large cyclic molecules prove true.
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