Acid-Base Equilibria

1. Write formulas for the conjugate bases for each of these acids: a) HCl b) CH4 c) HSO3- d) H2SO4 e) NH3 2. In the following reactions, identify the Lewis acid and the Lewis base: a) Fe3+ + 6H2O ←→ Fe(H2O)36+ b) BF3 + NH3 ←→ F3BNH3 c) BF3 + F- ←→ BF4- ...continues

Oxidation and Reduction

1. Define the following concepts: a) oxidizing agent b) oxidized substance c) reducing agent d) reduced substance 2. Determine the oxidation numbers of the underlined elements in the following formulas: a) KClO3 b) NH4+ c) Cr2O72- d) MnO42- 3. Balance the following equations by the half-cell method. ...continues

Organic Chemistry

1. Draw structural diagrams and give the names for the isomers of pentane. 2. When 2-butene reacts with hydrogen chloride gas, only one product is detected, whereas when 1-butene reacts similarly, two products are usually found. Explain this. 3. Geometric isomers exist in the alkenes but not in the alkynes. Explain why. ...continues

Electron Configuration

Could you please write the electron configuration for the following substance, using the orbital notation. Bromine(Br)

X-rays, CAT scans

X-rays and Computed Axial Tomography (CAT) scans are similar medical imaging technologies used to “peek” inside the human body. a) Describe one similarity and one difference between CAT-scans and conventional X-rays. b) Describe how Cat-scan technology overcomes the limitations of a conventional X-ray.

Transition Elements

1. What characteristic properties distinguish the transition elements from the Group IA and-IIA metals? 2. Name these substances. a) (Cu(Cl4))2- b) Ag(NH3)+2 c) Cu(NH3)4SO4 d) Al(H2O)6CL3 3. Why is it that NH3 readily forms complex ions with the transition elements but NH4+ does not?

Packing of Particles in Solids-space Lattices

Hexagonal Closet Packaging vs. Cubic Closet Packaging (face-centered) vs. Body-centered a) Which of the three types of packaging has the least efficient arrangement of atoms? Justify the answer. b) How do the two more efficient forms of packing compare regarding volume? c) What is the relationship between coordination n ...continues

Energy in chemical reactions

See the attached document and find the heat of reaction for each set of reactions. Reaction 1: Heat of Dissolution of NaOH Reaction 2: Heat of Reaction Between Aqueous NaOH and Aqueous HCl Reaction 3: Heat of Reaction Between Solid NaOH and Aqueous HCl Questions: 1. Write the net ionic equation for each reaction, ...continues

Thermochemistry

Calculate the work done (in Joules) when 33.3g of tin dissolves in excess acid at 1.04 atm and 22 degrees C. Assume ideal gas behavior. Sn(s) + 2H(aq) yields Sn2+(aq) + h2(g) I realize the equations PV=nRT and w=-p (change V) but have converted and can't seem to get it right?

Thermochemistry

Consider the reaction: H2(g) + Cl2(g) yields 2HCl(g) Change Heat = -184.6 If 6.00 moles of H2 react with 6.00 moles of Cl2 to form HCL, what is the change in kJ for this reaction at 1.0 atm and 25 degrees C. Assume the reaction goes to completion.