Thursday
May 23, 2013

# Posts by Megan

Total # Posts: 854

Physics
Sam tosses a ball horizontally off a footbridge at 4.3 m/s. How much time passes after he releases it until its speed doubles? Can someone please explain the correct equation to use thoroughly and help me to find the correct answer?!

Chemistry
Enthalpy changes: H2O2(l) ----> H2O(l) + 1/2P2(g) delta H= -94.6kJ H2(g) + 1/2O2(g)----> H2O2 delta H= -286.0kJ Calculate the value on delta H for the reaction: H2(g) + H2O2(l)----> 2H2O(l)

physics
you take 250.0 g of ice from the refrigerator at -8.00 degrees celsius. how much heat does it take to warm it to room temperature, 20.0 degrees celsius?

11TH Geometry
With the image of O(-2,-1) after 2 reflections. one across the line y=-5 and line x=1

Chemistry
2Na+F2=2NaF if 20.0 g of sodium is used what mass of sodium fluoride could be produced assuming that fluorine gas is unlimited

chemistry
2C2H6+702=4CO2+6H20 how many grams of oxygen are required to completely burn60.0g ethane (C2H6) show work Using the above equation how many Lof 02 are required to burn 20.0Lof ethane thank u soo much this is for a test

chemistry
Mg(ClO32=MgCl2+3O2 12.omolMg(ClO3)2produces molMgCl2and MolO2 3.00 molofMg(ClO3)2produces what mass of O2

ALGEBRA
first off, I like to circle to common ones... so I first circle the two x's. Since we are subtracting, it would be x-x which is 0. Thenm i circled the 2y's. It would be 2y - (-2Y) aka 2y +2y which is 4y. Then, -2z-2z which is -4z. it would be 0+4y-4z and you obviously ...

chemistry
How many moles of ions are contained in 1.4 L of a 1.6 M solution of Mg(NO3)2?

chemistry
How many moles of ions (cations and anions) are contained in 1.2 L of a 1.9 M solution of KCl? KCl K+ + Cl-)

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