Thursday
April 24, 2014

Posts by Justyna


Total # Posts: 13

math
find the average rate of change of F(x) on the intervals -1<x<1 and 2<x<5.

Chemistry
Calculate the work done when 40.0 g of tin dissolves in excess acid at 1.00 atm and 29°C. Assume ideal gas behavior. Sn(s) + 2 H+(aq) → Sn2+(aq) + H2(g)

Chem
Calculate the work done when 40.0 g of tin dissolves in excess acid at 1.00 atm and 29°C. Assume ideal gas behavior. Sn(s) + 2 H+(aq) → Sn2+(aq) + H2(g)

College Chem
Calculate the total number of electrons that can be present in the principal level for which n = 4.

Chemistry
What is the total number of orbitals associated with the principal quantum number n = 5?

Calculus
A rock is thrown upward off a bridge. In 2sec. the rock passes you on the way down. In 3 more sec. it hits the water. How high is the bridge above the water and how high did the rock go above the bridge? Can someone help me start his problem!?

ap chem
There are several oxides of nitrogen; among the most common are N2O, NO, and NO2. 1.Write the Lewis structures for each of these molecules. In each case the oxygens are terminal atoms. 2. Which of these molecules "violate" the octet rule? 3. Draw resonance structures...

AP Chem
use simple structure and bonding models to account for each of the following: A. the bond length between the two carbon atoms is shorter in C2h4 then in c2h6. B.the bond lengths in SO3 are all identical and are shorter than a sufur oxygen single bond. C. the N-O bonds in the N...

Alg 2
A person applying for a sales position is offered an alternative salery plan. Plan A- A base salery of $600 per month plus a commission of 4% of the gross value for the month Plan B- A base salery of $700 per month plus a commission of 6% of the gross sales of the month in exc...

Chemistry
Give the electron configurations of 22Ti+2 Do you know how to do this? Here is a site that will help you. Repost with specific questions about the points you don't understand. http://www.iun.edu/~cpanhd/C101webnotes/modern-atomic-theory/aufbau-principle.html

Ap chem question 2 related to the first question
Calculate the volume of gas you would expect to be evolved in X mol of magnesium were reacted with an excess of HCl at standard conditions. I'm going to tell you what my father told me...LOOK IT UP thanks for the unnecessary comment! Mg + 2HCl ==> MgCl2 + H2 1 mol Mg wi...

Ap Chem
If in an experiment we're working with Mg, HCl acid, and H20. We stick the magnesium in the acid mixed with water and the Mg dissolves. One of the products is hydrogen gas. If the water in the tube is evaporated, the other product, a white salt remains. Write a balanced ch...

Chemistry
what is the molecular formula of a compound that is 54.5% C, 9.09% H, and 36.4% O. with a molecular weight of 176g/mol. A)C8H16O4 B)C4H8O2 C)C7H12O5 D)C9H18O3 Assume you have 100 g of the substance, then you have 54.5g of C, etc. Moles C= 54.5/12=4.54 mol Moles H= Moles O= The...

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