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Bonding

Question About Covalent Bond

Which combination of elements would be most likely to form covalent bonds? a. lithium-flourine b. carbon-sodium c. carbon-flourine d. sodium-lithium e. sodium-flourine.

Polarity - Number of Bonds

KrF4 is_______________? a. a polar molecule with five polar bonds b. a polar molecule with four bonds c. a non-polar molecule with two polar and two non-polar bonds d. a non-polar molecule with four non-polar bonds e. a non-polar molecule with four polar bonds.

Equilibrium

1. Explain why some authors never write H+, but always write H3O+. 2. Any + ion in solution is attracted to the polar water molecules, but we often write Na+ ignoring the water. What is different about H+ that many chemists never write it alone? 3. Explain why choloracetic acid is a stronger acid than acetic acid.

Conductivity of a Strong Electrolyte

The conductivity of a strong electrolyte depends ont hte ions in the solution. H+ and OH- in water conduct electricity 3 to 5 times better than other monvalent ion. What happens to the conductivity of 0.1000 M HCl as it is titrated with 0.1000 M NaOH?

The solution to General chemistry questions

1. If the solubility of nitrogen is 1.90 cm3 / 100 cm3 blood at 1.00 atm, what is the solubility of nitrogen in a scuba divers blood at a depth of 155 feet where the pressure is 5.50 atm? 2. The solubility of nitrous gas is 0.121 g N2O / 100 g water at 20°C and 1.00 atm. What is the partial pressure of nitrous oxide required t

Solubility of Starches

1. Some starch/carbohydrates, although soluble in warm water, become gel like once experincing a cold atmosphere. The commercial dessert, Jell-O, is composed of just this type of starch. Making the dessert Jell-O requires bringing to a boli a certain amount of water before adding in the powdered Jell-O crystals. Then, as soon as

Chemistry problems

1. 0.412 mol of a solid was dissolved in 200 mL of water at 21.2 oC. After the solid had fully dissolved, the final temperature of the solution was 17.9 oC. What is the molar heat of solution of the substance? _______________kJ/mol 2. Use Appendix B and the fact that the heats of formation of OF2 and OCl2 are 24.7 and 80.37

Bonding Structures and VSEPR Theory

Help with various molecular geom/chem bonding problems. Any explanations would be greatly appreciated. (See attached file for full problem description with chart) 1. Fill in the table below for each of the following compounds. The column headings refer to the central atom, which is shown in bold type. (VSEPR Model)

5 Questions on Ionic/Covalent Bonding

(See attached file for full problem description with diagrams) 1. Which bonds below are polar and which are nonpolar? If a bond is polar, indicate which end is positive and which end is negative. (Pol Cov Bonds -Electronegativity ) C-S F-C N-O Si-Br Cl-C 2. Briefly explain why each Lewis formula attached

Heat Required for Phase Conversion

The fluorocarbon C2Cl3F3 has a normal boiling point of 47.6 degrees C. The specific heats of C2Cl3F3(l) and C2Cl3F3(g) are 0.91J/g-K and 0.67J/g-L, respectively. The heat of vaporization for the compound is 27.49kj/mol. I need to find the heat required to convert 25.0g of C2Cl3F3 from a liquid at 5.00 degrees C to a gas at 82

Molecular Formula, Classification, Limiting Reagent/Theoretical and Percent Yield

Write down the molecular formula (C_x H_y O_z) for each reactant and product, specifying the numerical subscripts. Besides being classified as an ester, give the possible other classification(s) of phenolphthalein according to its functional group(s). 9000g of phthalic anhydride is combined with 9500g of phenol - some H_2S

Reactivity of Organic Compounds

What kind is the chemical bnd between carbon and hydroged and why ? and their molecules be reactive ? please describe what are reactive molecules too.

Ionic substances and exothermic lattice

State which compound in each of the following pairs of ionic substances has the most exothermic lattice and why: NaCl, CaS Li2O, Na2O LiF, NaCl MgO, CaS Plus two requirements that should be satisfied for a molecule to be polar

Benzene Questions

1. Benzene is an organic solvent with the formula, C6H6. It boils at 80.1oC and melts at 5.5oC. Benzene's density is 0.88 gm/ml, its heat of vaporization is 20.0 KJoules per mole, its heat of fusion is 10.0 KJoules per mole, its heat capacity is 0.50 KJoules per mole-degree C for liquid benzene, 0.25 KJoules per mole-degree C fo

Ozonolysis of Myrcene

Myrcene, C10H16, a terpene, absorbs three moles of hydrogen to form C10H22. Upon ozonolysis myrcene yields the two compounds shown in the first attached .jpg (I5Q2a). 1. What structures for myrcene are consistent with the facts? 2. Based on the isoprene rule (naturally occurring terpenes are made up of isoprene segments)

PH problem - Buffer

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.

Molecules, atoms, composition, descriptions, bonds

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

Rate Constant and Periodic Trends

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)

General Chemistry

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?

Completing Energy Calculations

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.

Oxidation Number of Various Elements

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?

What is the Importance of Chemistry When Talking About Chlamydia

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

Intramolecular H Bond

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?