Chemistry Expressions

1. (a) Express 50 days in seconds (b) Convert 3.75 meter/sec to km/hr. Express the results in scientific notation. 2. Perform the following operations and express the answer with the appropriate number of significant figures. 863[1255-(3.45*10.8)] 3. The recommended dose of Elexophyllin (a drug used to treat ...continues

Chromate-dichromate equilibrium.

See attached file for full problem description. 1. How does the (H+) of the solution affect the CrO42-/Cr2O72- eqiuilibrium? 2. What poof was shown that CrO42- ions exist in a solution of K2Cr2O7. 3. In what way does OH- affect the equilibrium? Give two methods by which this ion upsets the equilibrium? 4. Write the e ...continues

Chemical Equilibrium

Calculate the Ksp for each of the salts whose solubility is listed below. b) MgF2: 2.7 x 10-3 mol/L

Oxidation and Reduction

Balance the following equations by the half-cell method. Show both half-cell reactions and identify them as oxidation or reduction. a) SO32- + MnO4- + H+ ←→ Mn2+ + SO42- + H2O(l) b) Cl2(g) + OH- ←→ Cl- + ClO3- + H2O(l) c) SO42- + I- + H+ ←→ S2- + I2(s) + H2O(l) See attached file f ...continues

Chemical Reactions

1. Some sulfuric acid is spilled on a lab bench. It can be neutralized by sprinkling sodium bicarbonate on it and then mopping up the resultant solution. The sodium bicarbonate reacts with sulfuric acid as follows. 2 NaHCO3(s) + H2SO4(aq) Na2SO4(aq) + 2 H2O(l) + 2 CO2(g) Sodium bicarbonate is added until the fizzing due to th ...continues

Calculating Volume, Pressure & Density

A sample of CO2 gas at 22°C and 7.71 atm has a volume of 6.0 L. If the pressure decreases to 5.42 atm, what is the volume? (Round your answer to one decimal place) 120 mL of ethyl alcohol, C2H5OH, is poured into a soft drink bottle at room temperature. The ethyl alcohol weighs 32.4 g and the bottle is heated to 100°C. What is ...continues

Frequency of Light

The red light associated with the Aurora Borealis is emitted by excited oxygen atoms at 6.60 X 10-7 m. What is the frequency of the light? Using scientific notation, (Round your answer to two decimal places) and write the exponent part as follows: x 10 to the _ power.

Calculating Mass and Moles

GIVEN INFO: from an unknown bottle: Unknown= #25 Metal present= Na Mass% metal= 43.88% Atomic masses: Cl= 35.453g O= 16.0g C= 12.0g H= 1.00g 1. Mass of crucible and cover= 32.493g 2. Mass of crucible, cover, and unknown=33.001g 3. Mass of crucible, cover, and solid chloride= 33.017g ----------------------------- ...continues

Balanced chemical equation

If 1 mole of Al4C3 has a mass of 144g and another has a mass of 12g, what is the atomic mass of aluminum? hydrogen cyanide (boiling temp 26 degrees) write a balanced chemical equation using the lowest possible whole number coefficients, including the state of each compound. Reaction occurs at a temperature above 100 degrees C ...continues

Calculating Molarity

An aqueous solution made up of 32.47 g of iron (III) chloride in 100.00 mL of solution has a density of 1.249 g/mL at 25°C. Calculate the following: Molarity An aqueous solution made up of 32.47 g of iron (III) chloride in 100.00 mL of solution has a density of 1.249 g/mL at 25°C. Calculate the following: Molarity