Friday
October 24, 2014

Posts by chemdummy


Total # Posts: 18

chem
What relationship exists between H^+ ion concentration and OH^- ion concentration? Waht is the OH^- concentration of an aqueous solution with the H^+ concentration of 10^-4M. Calculate the pOH? Need help with this pls. thank you.
November 28, 2012

chem
On the average; glucose (C6H1206) makes up about 0.100% by weight of human blood. How much glucose is there in 1.00 kg of blood?
November 21, 2012

chem
how to prepare 300ml of .250M HCl from a 1.00 M HCl stock solution
November 21, 2012

chem
You have a large amount of 7.50M stock solution. You need 1.80L of 3.00M solution for an experiment. How would you prepare the desired solution without wasting any stock solution?
November 8, 2012

chem
A very flexible helium-filled balloon is released from the ground into the air at 20degree C The initial volume of the balloon is 5.00L , and the pressure is 760mmHg. . The balloon ascends to an altitude of 20Km , where the pressure is 76.0mmHg and the temperature is -50degree...
November 1, 2012

chem
sorry but it should be -50 degree C i typed it wrong
November 1, 2012

chem
A very flexible helium-filled balloon is released from the ground into the air at 20degree C The initial volume of the balloon is 5.00L , and the pressure is 760mmHg. . The balloon ascends to an altitude of 20Km , where the pressure is 76.0mmHg and the temperature is 50degree ...
November 1, 2012

chem
Is CaCl2 an ionic compound or molecule? plss help. i'm just a little bit confused.
October 31, 2012

chem
Why is ther no such thing as NaCl molecule? pllllsss neeed heeelp thank you
October 30, 2012

chem
How many atoms are there in the following problems? which one has the most number of atoms? a. 5 molecuels (NH4)2S b. 9 molecules H2O2 c. 11 molecules O3
October 30, 2012

chemistry
How many moles of water are there in 5 moles of Tungsten(V)oxalate tetrahydrate?
October 19, 2012

chemistry
What is the mass of 4.80 moles of MgCl2?My answer is: Mg=24.3 g/mole Cl2=35.5g/mole*2=71g/mole so, Mg 24.3+ Cl2 71= 95.3g/mole therefore 4.80 moles * 95.3 g/mole=471.84g Am i right pls correct me if i'm wrong thanks
October 13, 2012

chemistry
thanks DrBob222 for the answer kindly teach me what does sum coefficient mean and how to get it based from this problem
October 8, 2012

chemistry
complete and balance Co(OH)3(aq)+Na2CO3(aq)
October 8, 2012

Chemistry
what is the 1. chemical equation 2. complete ionic equation 3. net ionic equation include phase of HCH3COO+NaHCO3 pls correct my answers 1. CH3COOH(aq)+NaHCO3(aq)+CH3COONa(aq)+H2O(l)+CO2(g) 2. CH3COOH(aq)+OH-(aq)=CH3COO-(aq)+H2O(l) 3. OH(aq)+CO2(g)
October 8, 2012

chemistry
C4 H10 O or diethyl ether or with a formula of CH3CH2OCH2CH3 its stick structure is H H H H ! ! ! ! .. H-C-C-C-C- O-H ! ! ! ! .. H H H H I used the this ! sign as a sign for bond. pls help me to determine the geometry for each central atom in this structure. 1) C Trigonal 2) C...
October 5, 2012

chemistry
colorless vinegar added to purple cabbage juice turns pink What is the reason behind and why is it considered a chemical change?
October 5, 2012

chemistry
When two solutions are mixed and a new color is observed, is this color change an indication that a chemical reaction has occurred? Explain. It is not possible to directly observe chemical bonds breaking and forming during a reaction, molecules and atoms are way too small. ...
October 5, 2012

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