Saturday
July 4, 2015

Posts by kem


Total # Posts: 26

science chemistory
Limestone is mostly calcium carbonate(CaCO3.john wants to know how much calcium carbonate is in a sample of mass 3,5 g of limestone.to the limestone he then adds concentrated hydrochloric acid (HCl).the products that form are carbon dioxide (CO2),calcium chloride (CaCl2) and ...
June 14, 2015

science chemistory
CaCO3 2HCl forms CO2 CaCl2 H2O 1.calculate the molar mass of calcium chloride produce 2.calculate the number of moles of calcium carbonate 3.calculate the mass of calcium carbonate
June 14, 2015

physical science chemistry
Thanks i would be thankfull
June 14, 2015

physical science chemistry
Fill in the missing words Ionisation energy, water, melting point, electronegativity, non-polar, solvent, pair, boiling points, polar A covalent bond is formed when a 1________ of electrons is shared between the bonding atoms.when the electrons are shared equally,a 2_______ ...
June 14, 2015

trigonometry math help
If cos 20=m determine the values of the following in terms of m. (a)sin 250 (b)sin 20 thanks
June 13, 2015

math trigonometry
Simplify cos180*sin225*cos80/sin170*tan135
June 10, 2015

math
F(x)=-(x+1)^2+4 determine the nature of the roots
June 4, 2015

melissa
How did you find f1,f2 and f3?
June 3, 2015

math
It's 3x^2+kx-k=3k
June 3, 2015

math
3x^2 kx-k=3x
June 3, 2015

math
Its 3x^2 kx-k=3x prove that this equation has rational roots for all rational values of K.
June 3, 2015

math
3x^2 kx-k=3x prove that this equation has rational roots for all ration values of K thanks
June 3, 2015

physics
A rocket of mass 5 000 kg is launched upwards into the sky at an acceleration of 20 m.s^-2. (a) Calculate the magnitude (b) calculate the direction of the thrust of the rocket's engines thanks in advance
June 3, 2015

math
How did u get 24 11=35
June 2, 2015

math
After finding the differences how will i find the tenth term?
June 2, 2015

math
Yes i do
June 2, 2015

math
0,3,8,15,24 how do i calculate the tenth term
June 2, 2015

physics
A block of 25 is pulled horizontally on a rough surface by the force 120N.the coefficient of friction between the surface is 0.34 how do i calculate the accelation of the block
June 2, 2015

chemistry
How do i calculate a,b and c please help me
May 27, 2015

chemistry
Sorry My mistake it's 300m^3
May 27, 2015

chemistry
14g of lithium hydroxide dissolves in 500cm^3 of water.in titration ,300m7^3 is used to neutralise sulphuric acid of 0,2mol.dm^-3 how do i calculate (a)concentation of a base and calculate for (c)volume of the acid and (c)which mass of Alkaline was used thanks in advance.
May 27, 2015

Geography
What are the causes of the pressure belts
May 21, 2015

math
As a part of a unit on weather students recorded the outroor temperature at 8:30 AM what was the difference between the weeks highest and lowest morning temperatures
October 20, 2014

chemistry
A CUBIC PIECE OF METER MEASURES 3.00CM ON EACH EDGE. IF THE METAL IS NICKLE WHOSE DENSITY IS 8.90G/CM^3.WHAT IS THE MASS OF CUBE
August 18, 2012

english
Select the sentence that has correct pronoun usage. Julie plans to travel this summer with Oscar and me. Julie plans to travel this summer with Oscar and I.
February 2, 2012

physics
l=(T^2*g)/4 yapýcan
October 24, 2011

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