Explore BrainMass

Reaction Intermediates and Mechanisms

In a Reaction Mechanism, a Reaction Intermediate is a molecular entity that is formed by the reactants which reacts further to form the products. Most chemical reactions require more than one step to form the products; and thus a reaction intermediate is almost always formed during the course of a reaction. However, these intermediates are often short-lived and are very difficult to isolate, as they are frequently very reactive.

For example consider the reaction:

A + B --> C + D

The above reaction may hypothetically proceed as follows:

A + B --> X1 + X2
X1 + X2 --> X3
X3 --> C + D

The species X1, X2 and X3would all be considered reaction intermediates, as they are neither the reactants nor the products, but are formed during the course of the reaction.

On an energy diagram a reaction intermediate can be identified by a valley in between the reactant and products (Figure 1).

Figure 1. Reaction Intermediate


Title Image Credit: Wikimedia Commons

Determining net ionic equation of a reaction

HINT: Aqueous ionic compounds exist as ions in solution. Start by writing the reactants as individual aqueous ions. Then use the solubility rules ( to identify any precipitates. Be sure to include phases and charges as necessary in your answer! Start by writing the rea

Balancing chemical equations, etc.

1. Use the periodic table to write the balanced chemical equation for the reactions of elemental calcium atoms and diatomic elemental nitrogen atoms. (Please explain how to use the periodic table to solve this problem and show work - I really want to learn how this works!). 3. An ion has 12 protons, 13 neutrons, and 10 electr

Equation for reaction balanced electronically and atomically

Solutions of calcium iodide and lead nitrate are mixed together. A reaction occurs where a solid forms at the bottom of the beaker. This is a precipitate of lead iodide. Calcium nitrate is also product but it stays in solution as ions because it is soluble. Write the equation for this reaction making sure that it is balanced ele

Limiting Reactant and Excess Reactant (Reagent)

1. What is the balanced chemical equation of CuSO₄and NaS? 2. Which of the following contains an excess of CuSO₄, or NaS, or neither? (excluding Test tubes 1 and 7) Test tube 1: 6 mL CuSO₄ and 0 mL NaS Test tube 2: 5 mL CuSO₄ and 1 mL NaS Test tube 3: 4 mL CuSO₄ and 2 mL NaS Test tube 4: 3 mL C

Calculating Neutralization Reactions

1.) What volume of 0.1379 M HCl is required to neutralize 10.0 mL of 0.2789 M NaOH solution? 2.) How many mL of 1.50 M NaOH is required to neutralize 275 mL of 0.5 M H2SO4? 3.) What volume of 0.2 M NaOH is required to neutralize 50 mL of 0.1 M H2SO4? 4.) How many mL of 2.3 M HNO3 is needed to neutalize 0.92 L of 0.5 M KOH?


(See attached file for full problem description) 1. You are given a couple of bags of ferrous iodide, and are instructed that you need to obtain the iron out of it. You need to find the most efficient way, and it should be as economical as possible. You decide to use electrolysis as your method, but you are not sure whether

A balloon is filled with a ratio of 2:1 of H2 and O2 gas.

A balloon is filled with a ratio of 2:1 of H2 and O2 gas. If left undisturbed no reaction takes place. A small flame or spark will cause a loud explosion, burning H2 to produce H2O. a) Write the balanced equation for this reaction. b) Draw a reaction coordinate diagram showing the energy of the reactants, the products, and t

General Chemistry Balanced Equations

Hi Thanks for your help with this word equation is sulfer dioxide + oxygen -----sulfer trioxide Using chemical symbols, write a balanced equation for the above reaction using the lowest possible whole number coefficents, include after the chemical formulae the symbol state of the compound. The other query is A island

Select correct balanced net ionic equation

Select the correct balanced net ionic equation for each of the following reactions, occuring in aqueous solution. Input the associated letter labels, in order (i)-(iii), no spaces, no commas. e.g. GBF (i) 2HCl + Mg --> H2 + MgCl2 (ii) CuSO4 + CaCl2 --> CuCl2 + CaSO4 (iii) Cu(NO3)2 + Ni --> Cu + Ni(NO3)2 A. CuSO4 +

Ionic equations

1.) What is the net ionic equation for the reaction of AgBr with a strong acid? 2.) What is the net ionic equation for the reaction of NaCl with a strong base?

Second Order Reaction

For the second order reaction below, the initial concentration of A is 1.34M. If k=7.61x10(exponent negative 4) seconds(exponent negative 1), what is the concentration of A after 18.3 minutes? 2A-->B rate=k[A](exponent2)

Identifying a catalyst in a reaction.

The elementary steps for the catalyzed decomposition for dinitrogen monoxide are shown below. Identify the catalyst. NO(g)+N2O(g)--->N2(g)+NO2(g) 2NO2(g)-->2NO(g)+O2(g)