Chem 30BL * Lecture 2 - UCLA Chemistry and Biochemistry
... • Place the cyclohexanol, the Montmorillonite K10 and a properly placed spin vane in the conical vial • If the conical vial and the Al-block have poor contact, use Al-foil on the sides and the bottom to improve the ...
... • Place the cyclohexanol, the Montmorillonite K10 and a properly placed spin vane in the conical vial • If the conical vial and the Al-block have poor contact, use Al-foil on the sides and the bottom to improve the ...
Band Theories
... If the atoms have p orbitals available, then this leads to a p band If the atomic p orbitals lie higher in energy than the s orbitals, the the p band lies higher in energy than the s band and there may be a band gap – a range of energies to which no orbital corresponds. ...
... If the atoms have p orbitals available, then this leads to a p band If the atomic p orbitals lie higher in energy than the s orbitals, the the p band lies higher in energy than the s band and there may be a band gap – a range of energies to which no orbital corresponds. ...
2014 Academic Challenge Sectional Chemistry Exam Solution Set 1
... top of the hill. The activation energy of the reverse reaction is the distance from the products to the top of the hill. The exothermic nature of the reaction requires EAfwd to be less than EArev. It is not required that this obey a first order rate law or be a gas phase reaction (B or D). The disso ...
... top of the hill. The activation energy of the reverse reaction is the distance from the products to the top of the hill. The exothermic nature of the reaction requires EAfwd to be less than EArev. It is not required that this obey a first order rate law or be a gas phase reaction (B or D). The disso ...
Which indicator is best in silver nitrate titrations
... The practical techniques are initially very tricky as the rate of reaction is slow but students should be able to obtain results fairly quickly once the apparatus is set up and working. Time needs to be allowed for soaking the eggshells. The modified apparatus suggested in the article does work and ...
... The practical techniques are initially very tricky as the rate of reaction is slow but students should be able to obtain results fairly quickly once the apparatus is set up and working. Time needs to be allowed for soaking the eggshells. The modified apparatus suggested in the article does work and ...
11. Reactions of Alkyl Halides
... species and the rate constant of the step • The highest energy transition state point on the diagram is that for the rate determining step (which is not always the highest barrier) • This is the not the greatest difference but the absolute highest point (Figures 11.8 – the same step is rate-determin ...
... species and the rate constant of the step • The highest energy transition state point on the diagram is that for the rate determining step (which is not always the highest barrier) • This is the not the greatest difference but the absolute highest point (Figures 11.8 – the same step is rate-determin ...
Polarity of Molecules
... Each F can accommodate an additional electron in its 2p subshell, but how can Be bind 2 fluorine atoms when it has no unpaired electrons? According to the VB model a bond results from sharing of unpaired electrons via overlap of AOs… ...
... Each F can accommodate an additional electron in its 2p subshell, but how can Be bind 2 fluorine atoms when it has no unpaired electrons? According to the VB model a bond results from sharing of unpaired electrons via overlap of AOs… ...
E. 2,3,6-trimethyl-4-octyne F. 1-butyl-3
... 6) (3 points) Hund’s rule states: a) Electrons fill orbitals starting at the lowest available (possible) energy states before filling higher states (e.g. 1s before 2s). b) No two identical fermions (particles with half-integer spin) may occupy the same quantum state simultaneously. c) Every orbital ...
... 6) (3 points) Hund’s rule states: a) Electrons fill orbitals starting at the lowest available (possible) energy states before filling higher states (e.g. 1s before 2s). b) No two identical fermions (particles with half-integer spin) may occupy the same quantum state simultaneously. c) Every orbital ...
PHT-224 Lectures 7
... toxic ammonia (increase pH) and CO2, which can cause ampoule to explode due to limited solubility in water. Therefore shelf life is based on 1% not 10% degradation. Product elegance: Solution of epinephrine becomes dark in color due to oxidation before 1% degradation has taken place. Degraded prod ...
... toxic ammonia (increase pH) and CO2, which can cause ampoule to explode due to limited solubility in water. Therefore shelf life is based on 1% not 10% degradation. Product elegance: Solution of epinephrine becomes dark in color due to oxidation before 1% degradation has taken place. Degraded prod ...
Learning Outcomes
... Transition metals exhibit variable oxidation states of differing stability. Compounds of the same transition metal but in different oxidation states may have different colours. Oxidation can be considered as an increase in oxidation number and reduction can be considered as a decrease in oxidation n ...
... Transition metals exhibit variable oxidation states of differing stability. Compounds of the same transition metal but in different oxidation states may have different colours. Oxidation can be considered as an increase in oxidation number and reduction can be considered as a decrease in oxidation n ...
Topic 11 Organic Chemistry
... 7. Give an equation for the complete combustion of methane, CH 4. Identify two products formed by the incomplete combustion of methane and identify one harmful effect caused by one of the products. ...
... 7. Give an equation for the complete combustion of methane, CH 4. Identify two products formed by the incomplete combustion of methane and identify one harmful effect caused by one of the products. ...
CH 3 Br + Nu
... involves two steps and occurs with inversion of configuration. involves one step and occurs with inversion of configuration. involves two steps and occurs with racemization. involves one step and occurs with retention of configuration. involves one step and occurs with racemization. ...
... involves two steps and occurs with inversion of configuration. involves one step and occurs with inversion of configuration. involves two steps and occurs with racemization. involves one step and occurs with retention of configuration. involves one step and occurs with racemization. ...
Section 16.1 A Model for Reaction Rates
... Collision Theory (cont.) • The minimum amount of energy that reacting particles must have to form the activated complex and lead to a reaction is called the activation energy ”Ea”. •A high Ea means that relatively few collisions have the required energy to produce the activated complex, and the rea ...
... Collision Theory (cont.) • The minimum amount of energy that reacting particles must have to form the activated complex and lead to a reaction is called the activation energy ”Ea”. •A high Ea means that relatively few collisions have the required energy to produce the activated complex, and the rea ...
A-level Paper 2 Practice Paper 6 - A
... When the initial concentration of C is 4.55 × 10–2 mol dm–3 and the initial concentration of D is 1.70 × 10–2 mol dm–3, the initial rate of reaction is 6.64 × 10–5 mol dm–3 s–1. Calculate the value of the rate constant at this temperature and deduce its units. ...
... When the initial concentration of C is 4.55 × 10–2 mol dm–3 and the initial concentration of D is 1.70 × 10–2 mol dm–3, the initial rate of reaction is 6.64 × 10–5 mol dm–3 s–1. Calculate the value of the rate constant at this temperature and deduce its units. ...
Woodward–Hoffmann rules
The Woodward–Hoffmann rules, devised by Robert Burns Woodward and Roald Hoffmann, are a set of rules in organic chemistry predicting the barrier heights of pericyclic reactions based upon conservation of orbital symmetry. The Woodward–Hoffmann rules can be applied to understand electrocyclic reactions, cycloadditions (including cheletropic reactions), sigmatropic reactions, and group transfer reactions. Reactions are classified as allowed if the electronic barrier is low, and forbidden if the barrier is high. Forbidden reactions can still take place but require significantly more energy.The Woodward–Hoffmann rules were first formulated to explain the striking stereospecificity of electrocyclic reactions under thermal and photochemical control. Thermolysis of the substituted cyclobutene trans-1,2,3,4-tetramethylcyclobutene (1) gave only one diastereomer, the (E,E)-3,4-dimethyl-2,4-hexadiene (2) as shown below; the (Z,Z) and the (E,Z) diastereomers were not detected in the reaction. Similarly, thermolysis of cis-1,2,3,4-tetramethylcyclobutene (3) gave only the (E,Z) diastereomer (4).Due to their elegance and simplicity, the Woodward–Hoffmann rules are credited with first exemplifying the power of molecular orbital theory to experimental chemists. Hoffmann was awarded the 1981 Nobel Prize in Chemistry for this work, shared with Kenichi Fukui who developed a similar model using frontier molecular orbital (FMO) theory; because Woodward had died two years before, he was not eligible to win what would have been his second Nobel Prize for Chemistry.