Explore BrainMass
Share

General Chemistry

General Chemistry

4.60 You have 505 ml of a 0.125M HCI solution , and you want to dilute it to exactly 0.100 M. How much water should you add?

Molarity Material Calculated

A quantity of 5.25 g of NaOH is dissolved in a sufficient amount of water to make up exactly 1L of solution. What is the molarity of the solution?

Jacobians and Polar Coordinates

Please view the attachment for proper formatting of the question. Question: The range of the polar coordinates are 0 <= r <= ~, 0 <= theta <= pi, and 0 <= phi <= 2pi and the range of the Cartesian coordinates are - ~ < x,y,z, < ~. In the integrals we must relate the two. This is done by the Jacobian, and the result is, d

Correctly Balancing Equations

Which, if any, of the following equations is or are correctly balanced? NH4NO3 N2 + O2 + H2O 3Cu + 8HNO3 3Cu(NO3)2 + 2NO + 4H2O 6CO2 + 6H2O C6H12O6 + 6O2 NaOH + Cl2 NaOCl + NaCl + H2O

Precipitate of AgCl

Will a precipitate of AgCl form when 0.050 mol NaCl(s) and 0.050 mol AgN0subnumber3(s) are dissolved in 500.0 milliliter of 3.0 mol/Litre NHsubnumber3 solution? (Kf for Ag(NH3)2^+ is 1.5x10^7) Ksp for AgCl = 1.6x10^-10.

8 precipitate of magnesium flouride

Will a precipitate of magnesium flouride form when 200.0 milliliter of 1.9x10^-3mol/Litre MgClsubnumber2 solution is added to 300.0 milliliter of 1.4x10^-2mol/Litre NaFsolution? (ksubletterssp(MgFsubnumber2)=6.9x10^-9) Briefly explain by showing your numerical calculations show work. thanks

Significant Figures - Scientific Notation

Need to calculate the average of the following two figures, and be sure to keep significant figures. 19.5 + 20.40 = 39.9 39.9 /2 = 19.95 If the answer is 19.95, what is the answer using significant figures only? Can the answer containing significant figures be put into scientific notation?

Conversion factors

Convert the following to the required units: 550 uL (microliters) per hour to milliliters per day Please show steps

Word problem: Convert uL to mL

A nurse plans to five flu injections of 50 uL (microliters) each from a bottle containing 2.0 mL of vaccine. How many doses are in the bottle? Please show steps to get answer.

Barium hydroxide

Write a balanced chemical equation, for the reaction that occurs, when Solid barium hydroxide, dissolves in water. Thank you

Calculating Vapor Pressure

The vapor pressure of a solution containing 53.6 g glycerin (C3H8O3) in 133.7 g ethanol (C2H5OH) is 113 torr at 40 degrees Celsius. Calculate the vapor pressure of pure ethanol at 40 degrees Celsius assuming that glycerin is a nonvolatile, nonelectrolyte solute in ethanol.

Half life

1) Radioisotopes such as aluminum -26, which is believed to have been present in the solar system when earth was formed but can no longer be detected, are known as extinct radionuclides. The half-life for the decay of aluminum -26 is 7.20 x 10 ^5 years. How many years did it take for 99.99% of the aluminum -26 to decay? If

Naming Complex Explanations

Cis-Co(en)2(NO2)2]+ trans-[Pt(NH3)3Cl3] I know that trans means opposite, cis and en I am not sure what that means but for some reason I am unable to identify the above complexes.

Element Compounds

What are element compounds and what are their properties? - Definition of element compounds - Properties of element compounds - Examples of element compounds - What element compounds are used for

Product Solubility

The solubility product of Ca(OH)2,is 7.9x10^-3 at 25C. Will a precipitate form when 100ml of 0.10 mol/L of CaCl2 solution and 50.0 ml of 0.070 mol/L of NaOH solution are combined?

De Broglie Waves

What is the de Broglie wavelength of a 145 g baseball traveling at 30.0 m/s (67.1mph)? Is the wavelength much larger or smaller than the diameter of an atom (on the order of 100 pm)?

Electromagnetic Waves: Radio Message from Mars

At its closest approach, Mars is 56 million km from Earth. How long would it take to send a radio message from a space probe of Mars to earth when the planets are at this closest distance?

Molar solubility

Calculate molar solubility of CuI in 1.0 M NaI. Assume the highest complex formed is CuI2 - .

Precipitation

Solid Na2SO4 is added to a solution that contains 0.150 M Ba 2+ and 0.0800 M Ca2+. Which sulfate precipitates first, BaSO4 or CaSO4? What calculations would porve this? What should be the concentration of sulfate ion for the best separation?