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April 27, 2015

Posts by Chemistry


Total # Posts: 214

Lauren
Write the electron configuration of Sn and Sn2+ Give the electron configuration of Cu+ and Cu2+
November 14, 2007

Lauren
For each of the following, write the electron configuration and Lewis symbol: A. In B. In- C. K+ D. I-
November 14, 2007

Lauren
How do I figure out how to write the lewis symbol for the following A. Br B. Br- C. Sr D. Sr2+
November 14, 2007

question for Dr.Bob22
i get how you get X = 2.077*Y, but i dont understand how if you plug in 0.481X in for Y to solve for x. x = 2.077(0.481x) x = 0.999x then what??? i know this is probably a simple stupid math question, but i need to do another problem like this and i'm stuck at this part...
November 11, 2007

question for Dr.Bob22
The mole fraction of acetic acid (CH3COOH) in an aqueous solution is 0.675. Calculate the molarity of the acetic acid, if the density of the solution is 1.0266 g mL-1. To give a different take on this, here is another way of approaching the problem. I don't claim it is ...
November 11, 2007

Jake
A combustion bomb containing 5.417 g of aluminum metal and 15.974 g of iron III oxide is placed in an ice calorimeter that initially contained 7.746 kg of ice (at o degrees C) and 7.894 kg of liquid water (at o degrees C). The reaction, once ignited by remote control, forms ...
October 16, 2007

Jake
If 142.38 g of l water at 21.7 degrees C is placed into a syrofoam cup with 174.36 g of ice at -27.5 degrees C what would be the final temperature of the entire contents at equilibrium? If it is partially frozen, how many g of the ice has melted? given values cp water = 4.184 ...
October 16, 2007

CHEMISTRY
Thank you DrBob222! I got it now!
September 27, 2007

chemistry
what does an atom of lead look like? what are the parts that compose of the atom? help me pls
September 3, 2007

Chemistry
A certain mine produces 2.5 108 kg of copper from chalcopyrite (CuFeS2) each year. The ore contains only 0.80% Cu by mass. (a) If the density of the ore is 2.0 g/cm3, calculate the volume of ore removed each year. (b) Calculate the mass of SO2 produced by roasting (assume ...
April 13, 2007

Jennifer
I asked this question yesterday and it was answered, but I still have a question on it. Standard entropies for substances are defined at a pressure of exactly 1 bar in some books or exactly 1 atm(760 torr) in different books. For gases, this correction factor would be..... in ...
April 4, 2007

Jim
I need some help with calculating percent yield and percent purity of aspirin. Here's my data (questions follow): SYNTHESIS Mass of salicylic acid.., 2.0 g Volume of acetic anhydride.., 5 mL Mass of watch glass.., 22.10 g Mass of aspirin and watch glass.., 28.01 g Mass of ...
March 24, 2007

Chemistry
Which of the following does form a Group II cation? lead iron cobalt nickel How do you figure this one out? You must know what is in group II. Fe, Co, and Ni are in group III. Pb is in both group I and group II. Pb ppts as the chloride in group I and as the sulfide in group II.
February 20, 2007

Chemistry
Al3+ and Pb2+ act as acids or bases in acidic or alkaline environment. True or False? I think this is true because they are amphoteric, but I am not sure. yes. They are amphoteric.
February 20, 2007

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