04/19/18

1. Why is it possible for the surface of a pond to freeze even though the water underneath is fluid?
Biology, science, tenth grade.
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04/18/18

how do you find the pressure in equilibrium?
the equilibrium 2 n2+o2=2n2o has a keq = 8.41x10^-8 at 25°c.If 0.54 atm of N2(g) and 0.27 atm of O2(g) are injected into a flask determine the equilibrium pressures of all gases
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04/18/18

What mass of rust (iron(III)oxide) would be produced if 10.0L of O2 gas completely reacted at 25 degrees Celsius and 1.004 atm of pressure?
High school Chemistry
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04/18/18

a large can of green beans weighs 500 grams how many cans of green beans weigh 2 kg
 I need to know there are 500 grams how many cans of green beans weigh 2 kg
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04/18/18

When potassium bicarbonate reacts with hydrobromic acid, the products will contain how many compounds?
need help please 
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04/18/18

17.9 mL of sulfuric acid solution was required to titrate 11.12 mL of 0.109 M potassium hydroxide solution to the equivalence point. What was the molarity of
the acid solution?  This is the rest of the question and please help thank you
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04/18/18

In a double replacement reaction between chloric acid and calcium hydroxide, how many grams of calcium chlorate are produced when excess calcium hydroxide
solution is added to 57.6 mL of 2.911 M chloric acid solution? This is the rest of the question that wouldn’t allow me to fit it in the other box and need help please thank you 
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04/18/18

How many hydrogen atoms are contained in 9.47x10^31 molecules of acetic acid?
need help please 
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04/18/18

A gas occupies a volume of 1.0 L at 25°C. What volume will the gas occupy at 100°C?
I need the problem worked out as well, I also need this answer back asap. Thank you. 
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04/18/18

What percent composition of oxygen in sulfurous acid?
help please
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04/18/18

Is there any way to express the relationship between Degree of Sulfonation (DS) vs Molecular Weight (Mw) statistically?
Dear All,I have measured the the degree of sulfonation and the molecular weight of the different sulfated polysaccharides and I wanted to express the relationship mathematically or statistically.... more
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04/18/18

Which of the following observations provide evidence that the air filling the syringe is matter
A. Plunger cannot be pushed all the way to the end B. The atudent can see all the way through the stringe. c. The volume reads 5 ml on the syringe
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04/18/18

How much of each must she use to make 20 liters of a solution that is 40% alcohol?
A nurse has a solution that is 25% alcohol and another that is 50% alcohol. How much of each must she use to make 20 liters of a solution that is 40% alcohol?
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04/17/18

A solotuion contains 0.60 mg/mL Mn2+. What minimum mass of KIO4 must be added to 5.00 mL of the solution in order to completely oxidize the Mn2+ to MnO4-?
A solotuion contains 0.60 mg/mL Mn2+. What minimum mass of KIO4 must be added to 5.00 mL of the solution in order to completely oxidize the Mn2+ to MnO4-?
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04/17/18

If the concentration of glucose is increased from 0.1 M to 2.0 M, will the conductance change?
If the concentration of glucose is increased from 0.1 M to 2.0 M, will the conductance change?
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04/17/18

Sherry had 13.5 liters of oxygen gas measured at 25 degrees Celsius. She took that the gas outdoors where it was 10 degrees Celsius. Volume of the gas afterward
You must find the volume of the gas after she moved it outdoors. Remember volume at room temperature measures in STP... 273Kelvin...
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04/17/18

chemistry question
write the equation for the neutralization reaction of potassium hydroxide and phosphoric acid.then calculate the concentration of a H3PO4 solution if 25 mL of H3PO4 is needed to neutralize 1.306 g... more
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04/17/18

Why did the crystals not form
In chemistry lab today when we were synthesizing aspirin, our mixture of 7.08g salicylic acid, 16.5ml of acetic anhydride and 20 drops of 85% of phosphoric acid did not form crystals after it was... more
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04/16/18

calculate the amount of sodium acetate that must be added to 200.0 ml of a 0.20 M solution of acetic acid to prepare a buffer with a pH value of 4.75. Assume th
Please show steps to solve! :)
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04/16/18

Determine the oxidizing and reducing agent in the reaction below. ClO2- -> ClO2 + Cl-
 Chemistry
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04/16/18

Calculate the pH and % dissociation of a 0.25 M solution of propanoic acid at 25 degrees Celsius. (Ka= 1.34 x 10^5)
Please post steps to find solution, thanks!
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04/16/18

How many milliliters of concentrated HCl 12.1 M should be diluted to prepare 200.0 ml of an acid solution with a pH of 1.50?
 This was an example for a exam review, not sure how to solve. A list of steps would be greatly appreciated, so I actually know how to solve it myself and can apply it to other examples like this.
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04/16/18

In a double replacement reaction, how many milliliters of 6.0 M phosphorus acid solution would be needed to react exactly with 25.0g of pure solid sodium
hydroxide? This is the last part of the question 
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04/16/18

In a double replacement reaction, how many grams of lead (II) iodide will precipitate when excess potassium iodide solution is added to 50.0 mL of 0.811M
finished question, of lead (II) nitrate?
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04/16/18

A solution is made by dissolving a small amount of salt in a beaker of water. The water is referred to as.?
need help please 
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