Friday

April 18, 2014

April 18, 2014

Total # Posts: 17

**Chemistry**

Water does not easily remove grease from dirty hands because grease is nonpolar and water is polar; therefore they are immiscible. The addition of soap, however, results in the removal of the grease. Examine the following structure of soap and explain why soap works. O || CH3(...

**Chemistry**

Lakes that have been acidified by acid rain can be neutralized by the addition of limestone how much limestone in kilograms would be required to completely neutralize a 5.2 x 10^7 -L lake containing 5.0 x 10^(-3) g of H2SO4 per liter.

**Chemistry**

To balance the oxygen and hydrogen for a redox reaction that takes place in acidic solution, it is necessary to use which of the following?A. H2O and H+ B. H2O only C. H2O and OH- D. OH- only

**Chemistry**

When an ionic compound dissolves in water, splitting into its respective ions, the positive ions will be attracted to the _________ end of the water molecule. A. neutral B. partially positive C. partially negative

**Chemistry**

total ionic equation for the reaction between hydrochloric acid and potassium hydroxide?KI(aq)A. K+ + I- B. K2+ + I2- C. K+(aq) + I-(aq) D. K2+(aq) + I2-(aq)

**Chemistry**

When given the pressure and force of a system, how should the pressure formula be rearranged to solve for area?

**Chemistry**

Gas particles are not found in which layer of Earth's atmosphere? A. exosphere B. mesosphere C. thermosphere D. magnetosphere I know it's not A.

**Chemistry**

Calculate the number of grams of water produced from 30 g of oxygen gas. List only the number of grams of water. First, you will need to balance the equation above. Round to the nearest hundredth. And, as always, don't forget the units.C6H10+O2---->CO2+H2O

**Chemistry**

What are the coefficent balance of this chemical equation H2SO4+NaNO2---->NHO2+Na2SO4?

**Chemistry**

If you start with ten grams of lithium hydroxide, how many grams of lithium bromide will be produced? Round to the nearest tenth. Don't forget the units.LiOH+HBr--->LiBr+H2O

**Chemistry**

C3H8+5O2---->3CO2+4H2O

**Chemistry**

If 5.0 moles of propane react, how many molecules of water will be formed? A.3.0x10.24 B.4.8x10.24 c.1.2x10.25

**Chemistry**

It should be 2HCl+Na2SO4--->2NaCl+H2SO4

**Chemistry**

2HCl+Na2SO4--->2NaCl+H2O, If you start with 20 grams of hydrochloric acid, how many grams of sulfuric acid will be produced? Round to the nearest tenth. Don't forget the units

**Calculus**

This is my first calculus class and I am lost on how to answer these. The book isn't giving me a clear explanation for help. Any help someone could provide would be great! 1. Use a reference triangle to find the given angle. cos -1 (1/2) give an exact answer in terms of pi...

**Calculus**

There is 1 error in the above answer. 11dy/dt = 6 dx/dt is true dx/dt = 6 is also true but dy/dt is not 6/11 ft/sec the 6 must be multiplied by the 6 from dx/dt giving dy/dt = 36/11

**Geomertry**

A = 1/2 h (b1 + b2) A = 201km square h = 17km b2 = 16km what is b1? My answer paper gives it as 7.65km but I cannot see how you get there

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