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 ...Show more


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
Save Your Time for More Important Things
Let us write or edit the essay on your topic
"Chemistry questions"
with a personal 20% discount.
Grab the best paper

Related Essays

Chemistry chemistry
This would include the attractions exerted by one molecule of a molecular substance on another, such as the force of attraction between water molecules in ice ,the attractions between atoms of the noble gas elements, Helium through Radon, attractions between molecules of one substance and molecules of another, as when two liquids are mixed, or a molecular solid such as sugar is dissolved in a liquid and the attraction between molecules of one substance and ions of another, as when an ionic compound dissolves in a liquid.
2 pages (500 words) Essay
One mole of beryllium weighs 9 grams, therefore we have 0.1 mole of beryllium if the mass is 0.9, one mole of oxygen weighs 16 grams therefore we have 7.3/16 moles of oxygen and finally we have 4.5 grams of aluminium therefore we have 4.5/27 moles of aluminium.
2 pages (500 words) Essay
Chemistry mechanism and synthesis
Thus, a methyl aldehyde is taken as starting material and made to react with an ethyl group Grignard's reagent such that a secondary alcohol is formed. Next, FGI agents are used to convert the methyl group to a nitrile one and the final product - scheme 1, product 2 - is formed.
9 pages (2250 words) Essay
Assuming that it takes 3 minutes for equilibrium to be reached, calculate the volume of CO2 produced (i) at equilibrium; i.e. at 3 minutes (ii) at 6 minutes (stp are assumed). 2. Compounds A (C2H4O2, 6.0 g) and B (CH4O, 3.2 g) were mixed together and equilibrated at 50 degrees C for 1 hour forming Compound C and water by esterification reaction.
4 pages (1000 words) Essay
Medicine. Chemistry
Here, compound is taken to mean chemical compound which means it's a chemical substance consisting of two or more different chemically bonded chemical elements, with a fixed ratio determining the composition. The ratio of each element is usually expressed by chemical formula.
4 pages (1000 words) Essay
Chemistry of Hazardous Chemicals Week V multiple choice questions and 2 essay questions
A good example to illustrate this method is the decomposition of ammonium chloride (NH4Cl (s)) into hydrogen chloride (HCl (g)) and ammonia (NH3 (g)). Equation 1 below illustrates the
3 pages (750 words) Essay
VIII Hazadous Chemical Chemistry multiple choice and two essay questions
of radiation are inversely dependent on each other which means that intensity of radiation can be decreased by increasing the distance to the source. The formula for inverse square law is I=Io/r2 where I is the intensity of radiation, Io is initial intensity and r is the
3 pages (750 words) Essay
Find out how much would it cost
to get a custom paper written by a pro under your requirements!
Win a special DISCOUNT!
Put in your e-mail and click the button with your lucky finger
Your email