Saturday

July 4, 2015

July 4, 2015

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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