chemistry questions - Essay Example

Only on StudentShare

Extract of sample
chemistry questions

The change of concentration of phenolphthalein (phth) with time is given in the table shown.
A substitution reaction is one in which a functional group is replaced by another in a chemical reaction, functional group are a group of atoms within a molecule that are responsible for chemical reactions, therefore the substitution reaction is
An additional reaction is one in which one or more molecules combine to form a new and larger molecule and this in turn reduces the degree of unsaturation, they are the reverse of an elimination reaction, our answer is
19. The following questions concern the molecules SF4 (central atom S) and BrF3 (central atom Br). In order to answer these questions, you will find it useful to use VSEPR theory to determine the shapes of SF4 and BrF3, and also to find the symmetry elements in both species and determine the point groups.
23. Four reagents in the Key for Q32 are employed in a sequence of reactions (steps 1, 2, 3 and 4) to convert m-bromonitrobenzene into m-bromobenzoic acid (32). Reagents B and D are used for steps 1 and 2 respectively. In the spaces in the Key, type the appropriate labels of the two reagents most suitable for steps 3 and 4.
25.Select the most likely structure for the compound that gives rise to the 13C NMR spectrum with peaks at the following positions (given as /ppm) with the off-resonance ...
Download paper

Summary

6. Select from the list a meso compound. (Hint: As an alternative to making models, you may find it helpful to assign R and S configurations to both of the central carbon atoms in each of the structures.)
9. at 298 K, a solution of phenolphthalein in a 40-fold excess of hydroxide ion starts off as a pink solution but gradually turns colorless as it reacts with OH(aq)…
Author : jaren94

Related Essays

chemistry chemistry
(Frederick, 1979, P.67) Intramolecular forces are much stronger than intermolecular forces hence the generally higher Melting and Boiling points associated with substances that have intramolecular forces. Aluminium, being a metal would be expected to form an ionic bond with Chlorine, which is a gaseous non-metal. This is not the case however due to the very small size of the Aluminium atom, which makes the Aluminium nucleus to exert very high attractive forces on its outer electrons, making it difficult for the atom to loose electrons in order to form ionic bonds. In Aluminium Chloride, the...
2 pages (502 words) Essay
chemistry
Aluminium is metal with atomic number 13 and it will combine by loosing two electrons. Beryllium and aluminium are metals and will combine with other elements by loosing electrons while oxygen will combine by gaining electrons, therefore our empirical formula will have the following formula:
...
2 pages (502 words) Essay
chemistry mechanism and synthesis
This lithium salt is undergoes acid hydrolysis to form the pentane-2-diol, the hydrate of the ketone, and this, in the absence of the organolithium any excess of which is destroyed by the addition of water, readily decomposes to form the ketone (Taylor, p. 95, 2002).
...
9 pages (2259 words) Essay
ASSIGNMENT IN CHEMISTRY
At that time, the equilibrium mixture was quickly cooled in an ice bath and analyzed where the amount of A remaining was found to be 0.04 moles.
...
4 pages (1004 words) Essay
Medicine. Chemistry
The hits come from natural sources, such as plants, animals, or fungi. They can also form synthetic sources, such as historical compound collections and combinatorial chemistry.
...
4 pages (1004 words) Essay
Chemistry of Hazardous Chemicals Week V multiple choice questions and 2 essay questions
The second method is the oxidation-reduction process. Most of the compounds decomposed by this method react explosively to thermal decomposition. For this reason, DOT does not allow carriers to transport them. A good example of these compounds is the ammonium dichromate (NH4)2Cr2O7(s), which decompose to chromium (III) oxide Cr2O3 (s), nitrogen (N2 (g) and water (H2O (l) on heating as illustrated in equation 2.
...
3 pages (753 words) Essay
VIII Hazadous Chemical Chemistry multiple choice and two essay questions
By applying the inverse square law here, with an initial reading of 6300R at a distance of 1 foot, then at 3 foot after applying the inverse square law of radiation i.e. I=Io/r2, the Geiger Counter would show a reading of 700R. A unique characteristic of radioactive elements is that they continue to emit radioactive rays which causes them to decay. Time after which the number of atoms of a radioactive substance are reduced to half is known as Half-Life. The half-life of plutonium is around 87.7 years. So if Dr. Brown has 1.2 x 106 atoms of plutonium in 1985, we can calculate the number of...
3 pages (753 words) Essay
Got a tricky question? Receive an answer from students like you! Try us!