1. A typical buffer used by biochemists is called Tris, which can be depicted as R3N (i.e. a tertiary amine). A buffer that is prepared by mixing 500 ml of 0.05 M R3N with 500 ml of 0.05 M R3NHCL at 25 degrees Celsius has a pH of 8.4. If this same buffer is placed in a cold room at 4 degrees Celsius, the pH decreases to 9.2.
Select a molecule. List the atoms that that molecule is composed of and describe the type of bond that holds those atoms together. Be sure to explain how this bond works. The following template must be used to answer the question. Molecule Name: Atoms Found: Chemical Formula: Bonds Found: How Bonds Wor
I need some help answering these two questions: 1. For the following balanced reaction, determine the rate expression and the rate constant, k, for it using the data given below. 2A + B +C yields D + 2E + F Experiment [A] mol/L [B] mol/L [C] mol/L Rate (M sec-1)
Briefly summarize the life of Linus Pauling and his contributions to the area of chemical bonding.
A saturated solution _______________. a. cannot be attained b. contains dissolved solute in equilibrium with undissolved solid c. contains as much solvent as it can hold d. will rapidly precipitate if a seed crystal is added e. contains no double bonds Which one of the following is most soluble in water?
Compare and contrast ionic and covalent bonding. Include the definition of anions and cations
Determine the total amount of energy lost when 35 g of water are cooled from 135 degrees C to 25 degrees C. Lable each of the six steps and show me the equations and calculations.
How can you tell the oxidation number of various elements such as Mn in MnO4, and N in NO3- and how can you tell what signifies the oxidizing agent and what signifies the reducing agent?
I am looking for information involving the chemicals involved in maintaining the cellular wall integrity pre-host cell replication. I already have some information about disulfide bonds and sugar gateways in the pre-host cell membrane. Other searches have directed my attention to anti-oxidants (ascorbic acid) and the effects
1,3 Propanediol, HOCH2CH2CH2OH can form intra H bonds and inter molecular H bonds. Draw the structure of 1,3 Prop. that shows an intramolecular H bond. What does the 1,3 mean?
The basis of the VSEPR model of molecular bonding is ____________. a. regions of electron density on an atom will organize themselves so as to maximize s-character b. atomic orbitals of the bonding atoms must overlap for a bond to form c. hybrid orbitals will form as necessary to,
Both my mum and I have looked everywhere and cannot find what I need. I have to find the alcohol formulas for; Methanol, Ethanol, Propanol, Butanol, Pentanol, Hexanol, Heptanol and Octanol. We have found chemical tables and compounds but not specifically any containing alcohol. Please can you help or tell me where i could loo
Please help with the following questions. Question 6 The formula CH3CH2CH2=CH2 represents an alkene an alkyne an alcohol benzene Question 7 The number of orbitals in a d subshell is: 1 2 3 5 7 Question 8 _____ is credited with the modern structure of the
Please help with the following problem. Question 1 All acids have the common component H+, true or false? Question 2 Calculate the number of moles of aluminum in 96.7g of Al. a) 0.28 b) 3.6 c) 7.4 d) 4.2 Question 3 The melting point of bromine is -7°C. What is this in °F? a) -12.6°F b) -28
For each molecule, draw the Lewis structure first, then apply the VSEPR model according to the following rules: 1. Count the number of electron pairs around the central atom (both bonding pairs and unshared pairs). Treat double and triple bonds as if they were single bonds. 2. Refer to the table given below to predict the geom
I need to write an essay that explains how a given set of names for binary ionic and molecular compounds can be determined. For an example let's pick KF which is potassium flouride. How can that name be found? I also need to discuss the nomenclature and chemical formulas in this essay by distinguishing between them. Wh
The problem to solve is to formulate in which way two carbon atoms are described by using atomic orbitals. First one has to find out the electronic structure of a carbon atom by locating this element in the periodic table. Second step is then to fill the orbitals with the given number of electrons using Hund's rule. The third
What do each of the "items" stand for in the following formula for ethyl cyanoacrylate? CN l H2C=C l COOC2H5
4.81 Which of these aqueous solutions would you expect to be the best conductor of electricity at 25° C? Explain your answer? (a) 0.20M NaCl (b) 0.60M CH3COOH (c) 0.25M HCl (d) 0.20M Mg (NO3)2
6 ) Iron has a density of 7.86 g/cm3. The volume occupied by 55.85 g of iron is: 7 ) Which pair of elements would be most likely to form an ionic compound? P and Br Cu and K C and O O and Zn Al and Rb 8 ) Which is the formula for the binary compound of potassium and nitrogen? KN K2N NK2
Write the formula for the compound rubidium nitrite.
I have been given the attached as a balanced chemical equation for the complete oxidation of one mole of oleic acid. 2CH3(CH2)7CH = CH(CH2)7COOH + 51)2 = 36CO2 = 36CO2 + 34H20 Using the following table how do I work out the energy released by the reaction? TYPE OF BOND AVERAGE ENERGY CONTENT/kJ mol-1 Single ca
This is a past exam for practice. Please complete question 5 only. 20 5. Write brief notes on any four of the following: a. Metal-organic vapor phase epitaxy b. Berry's rotation. c. Effect of polarization on melting points d. IR spectroscopy as a tool for structure determination of inorganic compounds e. Rochow pr
3. Explain why: a. Lewis acid strengths of boron halides are in the order BBr3 >> BCl3 > BF3 opposite to the order expected based on electronegativities. b. Radius ratio rule is correct only 66% of the times in predicting coordination numbers in ionic compounds. c. Me3B is a monomer, whereas Me3Al exits as a dimer. d. Vis
1. Explain the following, with suitable examples: a. Frontier orbitals b. A 3-center 2e- bond c. Tendency of P to form d pi -p pi bond d. Self dissociation of ammonia e. Formation of halogen cation **Please see attachment for proper citation of symbols.
Out of 250 questions, I am unsure of the following: 1.For a given substance that exhibits liquid-crystalline properties, the transition from solid to liquid-crystal state occurs: a.over a range of temperatures that includes the melting point of the soild. b. at a well defined temperture above the melting point of the solid.
Using the table of bond energies to determine the DH for the reaction: 2H--F(g) H--H(g)+ F--F(g)
How is it possible that [Co(h20)6]3+ will oxidize water but [Co(Nh36]3+ is stable in aqueous solution? Both are mondentate ligands. I thought the proximity of the nitrogens after one has bonded to the cobalt would make it more likely to react, because the entropy would be lowered. They are also both low spin complexes.
My professor gave us this and told us that some of these problems will be on our test. I just want to make sure I know how to do all of them correctly. Thanks! 1. When describing structures of solids, especially ionic solids, structure types are typically associated with the structures of well-known species. If a system we
In forming a covalent bond, electrons are (a) shared by two atoms (b) given up by an atom (c) taken up by an atom (d) none of the above (e) all of the above