Saturday
December 20, 2014

Posts by Rav


Total # Posts: 22

Science 10
Oh wait my decomposition is wrong I guess so I need it for that as well
October 27, 2014

Science 10
Need examples of food for Chemistry Reactions 1. Synthesis 2. Decomposition 3.Single Replacement 3. Double Replacement So for synthesis ( A + B --> AB ) I did, Macaroni + Cheese --> Mac n Cheese For Decomposition ( AB --> A + B ) I did, Dough --> Wheat + Water ...
October 27, 2014

Science 10
Thanks so much I agree:)
October 27, 2014

Science 10
The results are there for each trial Trial 1 = Hydrochloric Acid is dilute. Marble is finely ground and the temperature is 20 degrees Celsius Trial 2 = Hydrochloric acid is dilute. Marble is lump and the temperature is 40 degrees Celsius. Trial 3 = Hydrochloric acid is ...
October 27, 2014

Science 10
Here are the results of the 3 trials of dissolving equal masses of marble in hydrochloric acid listed from fastest to the slowest. List concentration, surface area, and temperature in decreasing order of their important in increasing the rate of this reaction. Trial 1 = Dilute...
October 27, 2014

Math
Company 1 = 9.95+0.10x = y Company 2 = 12.95+0.08x = y Not sure of the second question
September 20, 2014

grammer
The best girl at sports in the class is my best friend. Last year, she won two medals for swimming. It was when the had a huge swimming gala at the Bath in Town. Everyone and their parents were there in the lower school. The noise was so loud that our teacher went nearly deaf...
September 16, 2014

math
A spherical ball is being filled with air. When the radius r=7cm, the radius is increasing at a rate 2 cm/s. How fast is the volume changing at this time (leave your answer approximate)?
November 12, 2012

Physics C. Mechanics
A small paint bucket of mas 5.0 kg is attached to a larger bucket of mas 15.0 kg by a light rope of 25 m long. The small bucket is at rest on the ground, and the rope goes up and over a small frictionless pulley and is attached to the larger bucket, which is on a window sill, ...
October 18, 2010

ap chem
nvm, i get it.
May 2, 2010

ap chem
NH3 + H20 <---> NH4+ + OH- this is aqueous solution. In 0.0180 M nH3, THE [OH-] is 5.60 X 10^-4 M. it is assumed that the volumes are additive. Determine the value of the base ionization constant, kb, for NH3. i am not sure how to approach this problem. i dont udnerstand...
May 2, 2010

chem--electrochemistry
So in this reaction: Ag(s) + Fe(+3) --> Ag(+) + Fe(+2) we are given 20 grams of Ag(s) to start off with. How do we find how many electrons are transfered in the reaction. And how many grams of Fe(+2) is formed. *for the latter, i think that we can calculate it through ...
March 28, 2010

chem--buffers
yes, that is exactly what i get(i got 5.87, but that's probably just a simple rounding error). i used the wrong equation, and didn't include the hydrogen ion from HCl in the equation, and just used the acetic ion as the only source of the hydroxide ion. But your ...
March 7, 2010

chem--buffers
Calculate [H30+] in a solution that is 0.0525M HCl and 0.768M NaC2H3O2. Ka(HC2H3O2)= 1.8 x10^-5. the way i did it is that i used the given molar of HCl to find the moles of Hydronium in the acid, and then i used that to find the moles of OH- in it, using kw. then thru the ...
March 7, 2010

chemistry
this is just simple dimensional analysis and conversion... (.0 X10^23 molecules)(1 mol/6.02 X10^23 molecules)([molar mass ethanol=g/1 mol)(upside down density=mL/g)(1L/1000mL) through this conversion process, u'll get the answer.
February 28, 2010

Chem--buffers
thank you....i understand the concept clearly now.
February 28, 2010

Chem--buffers
Explain why a mixture formed by mixing 100 mL of 0.100M CH3COOH and 50 mL of 0.100M NaOH will act as a buffer? in adittion to this, how do you identify if a an aqueous solution is a buffer solution, such as a solution with an acid and a base, but no common ion? is it possible ...
February 28, 2010

chem
What must be the molarity of an aqueous solution of NH3 if it is 4.2% ionized?
February 21, 2010

chem
Sorbic acid, HC6H702 (pKa=4.77), is widely used in the food industry as a preservative. For example, its potassium salt (potassium sorbate) is added to cheese to inhibit the formation of mold. What is the pH of 0.37M KC6H702(aq)?
February 21, 2010

vector and mass
A particle of mass m kg is acted on by two forces F1 and F2 with magnitudes 3root5 newtons and root5 newtons ad drections parallel to the vectors i+2j and i-2j respectively The particle is initially at a position given by vector 2i+j iv calculated the cartesian components of ...
July 15, 2006

ship problem
A [B]ship P [/B] is travelling due [B]East at 30 km/h[/B] and a [B]Ship Q[/B] is travelling due [B]South at 40 km/h. [/B] Both ships keep constant speed and course. [B]At t=0 they are each 10 km [/B] from the point of intersection of their courses and moving towards the point...
July 15, 2006

maths/physics
particle of mass m kilograms is acted on by two forces F[1] and F[2] with magnitudes 3*sqr-root 5 newtons and sqr-root 5 newtons and directions parallel to the vectors i+2j and i-2j respectively. The particle is initially at a position given by the vector 2i+j i was told to ...
July 14, 2006

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