Look up the following materials and say which class of magnetic response you would expect each to be.

a. chromium   b. Magnetite c. cobalt d. oxygen e. nitrogen   f. iron oxide   g. platinum    h. Alnico   i. SmCo₅

Questions:

1. Explain two things in the procedure that may reduce the final percent yield.
2. The K₃[Fe(C₂O₄)₃]·3H₂O crystals are green. The compound absorbs light at 675 nm.
   1. What color of light does this correspond to in the visual light section of the electromagnetic spectrum?

2. Compare your answer in part a to the observation of green crystals. Is the color you see the absorbed color or transmitted color?

calculate delta g for the reaction between Cr (S) and Cu 2+ (aq)

In the extraction of trimyrisitn from nutmeg:

Why was diethyl ether used as the extraction solvent instead of using acetone directly, since you were going to recrystallize using acetone anyway

How would your results be different (if at all), if the reflux was only done for 10 minutes? Briefly explain

Why is the technique of reflux generally used in organic chemistry

An aqueous solution known as Ringer's lactate is administered intravenously to trauma victims suffering from blood loss or severe burns. The solution contains the chloride salts of sodium, potassium, and calcium and is also 3.6 mM in sodium lactate (NaC3H5O3). How many grams of sodium lactate are needed to prepare 8.5 liters of Ringer's lactate?

Experiment: Antacid tablets will be analyzed for their ability to neutralize acids. Specifically the quantity of 'simulated stomach acid' neutralized by the antacid.

Question: Why was methyl red used as an indicator in the experiment rether than phenolphthalein? (endpoint between pH 8 and 10)

Which of the following situations will produce a precipitate?

A solution containing 0.0030 M Ca2+ and 0.025 M CrO42- (Ksp for the possible CaCrO4 = 7.1 × 10-4).

A solution containing 0.095 M Tl+ (thallium(I)) and 0.0020 M Cl- (Ksp for the possible TlCl = 1.9 × 10-4).

A 500 mL solution containing 9.0 × 10-4 mol Sr2+ and 1.0 × 10-4 mol HPO42- (Ksp for the possible SrHPO4 = 1.2 × 10-7).

A solution containing 1.2 × 10-3 M Ba2+ and 1.2 × 10-2 M F- (Ksp for the possible BaF2 = 1.8 × 10-7).

The 1s--> 2p transition in a hydrogen-like ion occurs at 7.10704x10⁵ cm^-1
.
a. What is the ionization energy of this atom in Joules?
b. If this atom is ionized with light with a wavelength 4.00 nm, what is the de Broglie
wavelength of the ejected electrons?

The formation constant* of [M(CN)6]4– is 2.50 × 1017, where M is a generic metal. A 0.160-mole quantity of M(NO3)2 is added to a liter of 1.240 M NaCN solution. What is the concentration of M2 ions at equilibrium?

What is the pH of a solution that is 0.10 M KNO2 and 0.15 M HNO2? (Common ion)

at 1000degrees C the value of equilibrium constant for the reaction below is 1.62. how many moles of each compound will there be at equilibrium if 1 mole of h2, 2 moles of co2, and 3 moles of co are placed in a 10 liter tank and heated to 1000 C? H2 (g) +aCO2 (g)-----H2O(g) + CO(g)

Below are the line structures for four biofuels, as well as data for the energy content of ethanol and biodiesel. H3C OH Ethanol O OH OH HO HO HO Glucose (wood) H3C OH Butanol H3C O O CH3 Biodiesel

Fuel Energy Content (MJ/kg) Chemical Formula O:C ratio

Ethanol 27

Biodiesel 44

Butanol

Glucose

a. Interpret the structures to determine the chemical formula of each fuel and write it in the table above.

b. Use the chemical formula information to determine the oxygen to carbon (O:C) ratio of each fuel and fill in these values in the table above.

c. Based on the above data, predict the energy content of butanol and glucose. Would the energy content be below 27 MJ/kg, above 44 MJ/kg, or somewhere in between these two values? Indicate these predictions in the table above.

Arrange the following bonds in order of increasing polarity:
O-Cl, C-Cl, H-Cl, and F-Cl

find pH. A.) a solution that is 0.170 M in propanoic acid and 0.110 M in potassium propanoate Express your answer using two decimal places. B.) a solution that contains 0.690% C5H5N by mass and 0.990% C5H5NHCl by mass Express your answer using two decimal places. C.) a solution that is 17.0 g of HF and 27.0 g of NaF in 125 mL of solution Express your answer using two decimal places