07/16/18

Effective buffer range?
The Ka for a hypothetical weak acid HX is 3.1 x 10-5. Buffer solutions containing HX and NaX could be prepared to make a range of pH values. What would be the lower and upper pH values of the... more
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07/16/18

MOLES AND MOLECULAR OXYGEN CHEMISTRY HELP PLEASE.
Based on the following chemical equation SO2 + O2 -> SO3 (unbalanced!), h ow many moles of molecular oxygen will be needed for the complete combustion of 100.0 g of sulfur dioxide?
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07/16/18

How many moles of chlorine per liter of drinking water are safe for human consumption
Safe level for chlorine in drinking water is 4 ppm
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07/16/18

Is memantine hydrochloride is lyophillic or lyophobic?
Is memantine hydrochloride which is used to treat alzhiemer is hydrophobic or hydrophillic substance?
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07/16/18

Which situation would not cause the following equilibrium reaction to shift to the right? The forward reaction is endothermic. N2O4 (g) Two arrows stacked
Which situation would not cause the following equilibrium reaction to shift to the right? The forward reaction is endothermic. N2O4 (g) Two arrows stacked on top of each other. The top arrow points... more
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07/16/18

How would an increase in pressure affect the following reaction? N2 (g) + O2 (g) Two arrows stacked on top of each other. The top arrow points to the right. T
How would an increase in pressure affect the following reaction? N2 (g) + O2 (g) Two arrows stacked on top of each other. The top arrow points to the right. The bottom arrow points to the left. 2NO... more
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07/16/18

In the reaction shown below, the equilibrium constant K has a value less than 1. wA + xB Two arrows stacked on top of each other. The top arrow points to the
In the reaction shown below, the equilibrium constant K has a value less than 1. wA + xB Two arrows stacked on top of each other. The top arrow points to the right. The bottom arrow points to the... more
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07/16/18

How many grams of sucrose and water are needed to make 300.0 g of 20.0% solution?
Please answer my question....
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07/13/18

percentages.
A mixture of alcohol and water contains a total of 36 oz of liquid. There are 9 oz of pure alcohol in the mixture. What percent of the mixture is water? What percent is alcohol?
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07/13/18

The temperature of 20 liters of helium gas is increased from 100K to 300K. If the pressure was kept constant, the new volume will be how many liters
need help asap
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07/13/18

(3.10) A gas occupies 200mL at -73 C . To have the same gas occupy 300mL the new temperature must be what
need help asap
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07/11/18

what should be the atomic mass of this element? Isotope A = 416.3 amu = 26.83 % abundance Isotope B = 418.3 amu = 26.59 % abundance Isotope C = 421.3 amu = 4
Isotope C =46.58%
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07/11/18

a sulfide of an element A, contains 3 atoms of S per formula unit and is 43.71% S. A) What is the formula weight of the compound? B) AxS3
plsssss help meee I really need the answer.
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07/09/18

How to determine the temperature range at which carbon can reduce iron (III) oxide to iron?
3 Fe2O3 (s) + 3 C (s) --> 4 Fe (s) + 3 CO2 (g)   Is there a certain equation that is used to determine the temperature range? I have calculated the ΔHrxnº, ΔSrxnº, ΔGrxnº I'm not sure if... more
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07/09/18

What is the solubility? Tell deeply.
What is meant by solubility? Please gime a answer and an example.
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07/09/18

Helium, A Grade, 200bar Cylinder. 1.83m3 volume at 200bar = how many litres?
I have a helium cylinder, volume is 1.83m3 at 200bar. So how many litres of helium exists in the Cylinder. And what is the value in cu ft.
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07/09/18

How to prevent titanium from oxidation?
we mix Titanium (Ti ) Powders with TiO2 in water to make a slurry or use mortar to grind. After complete mixing Titanium is Changed to TiO2 before printing (experiment). Is there any liquid or... more
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07/08/18

How does burning a compound compare to it's reading in a spectrophotometer?
for example, burning copper chloride, and also analyzing it in solution in a spectrophotometer.
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07/08/18

Mixture to determine optimal blend of three variables with three different attributes (see description)
Lets say you have 3 substances (A, B, and C) And now say each substance is made up of three mixes of varying percentages (X, Y, Z) We will say substance A is 10% X, 20% Y, and 70% Z Substance B... more
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07/07/18

Conc. aq. sulphuric acid is 98% H2SO4 by mass and has a density of 1.84g cm-3. What volume of the concentrated acid is required to make 5 litres of 0.5M H2SO4?
I've got an assignment of 87 questions this being the 54th. I tried solving but ended with 133152.1739ml as the final value. (I'm sorry Im horrible at chemistry n i've come here seeking for some... more
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07/07/18

question based on dilution and mixing if liquids
what volume in ml of 0.2M h2so4 solution should be mixed with the 40 ml of 0.1 M naoh solution such that the resulting solution has the concentration of h2so4 as 6/55 M
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07/06/18

the heat of precipitation of iron (III) hydroxidde, Fe (OH) is -10kJ. When a 2mol dm^-3 sodium hydoxide, NaOH solution was mixed together with a solutionof iron
the heat of precipitation of iron (III) hydroxidde, Fe (OH)3 is -10kJ. When a 2 mol dm-3 sodium hydoxide, NaOH solution was mixed together with a solutionof iron (III) chloride, FeCI3, 200 J of... more
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07/05/18

Hydrogen Peroxide: C1=100%, V1=50 ml, C2=2%, V2=???
Solve the following problems. (You need not compute the amount of diluent)
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07/05/18

Carboxylic acid group of one amino acid and amine group of another amino acid create what functional group?
Carboxylic acid group of one amino acid and amine group of another amino acid create what functional group? Condensation is a chemical reaction in which two substances combine to form a larger... more
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07/05/18

What is a polymer made of hundreds of amino acid monomers called?
What is a polymer made of hundreds of amino acid monomers called? And what do we call the unfolding of a protein so that it is no longer in its original shape?
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