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An electronic transition in the Paschen series of hydrogen involves an electron dropping from the n=5 level to the n=3 level. What is the wavelength for this transition? Express your final result in micrometers. (SHOW ALL WORK)
The radiation generated by a microwave oven has a frequency of approximately 2.45 x 10^9 s^-1. What is the wavelength of this radiation? (SHOW ALL WORK)
A cheese maker added 4.00 L of milk to a sample of bacterial culture. He knew that once the concentration of lactic acid reached 1.25 x 10^-2 mol/L the cheese would be ready. He took a 10.00 mL sample of the cheese, added several drops of phenolphthalein, and titrated the sample against a 0.111 mol/L NaOH solution. 1.15 mL of NaOH was required to for equivalence.

CH3CHOHCOOH(aq) + NaOH(aq) --> H2O(l) + CH3CHOHCOONa(aq)

Determine the concentration of lactic acid in the cheese.
Could you explain the mechanism of AChE hydrolysis of ACh in chemistry diagrams
The food we eat is degraded,or broken down, in our bodies to provide energy for growth amd function. A general overall question for this very complex process represents the degradation of glucose ( C6 H12 O6) to carbon dioxide (CO2) and water ( H2O)

C6 H12 06 arrow 6CO2 + 6H2O

If 856 g of C6 H12 O6 is consumed by a person over a certain period, what is the mass of CO2 produced?
Exactly 100 ml of 0.15 M acetic acid (HC2H3O2,Ka = 1.8x 10^-5) are titrated with a 0.20 M NaOH solution. Calculate the pH for (a) the initial solution (the HC2H3O2), (b) the point at which 37.5 ml of the base has been added, (c) the equivalence point (d) after adding 80.0 ml of 0.20 M NaOH
A chemist must prepare 875.mL

of 3.00M

aqueous nickel(II) chloride NiCl2

working solution. He'll do this by pouring out some 3.43M

aqueous nickel(II) chloride stock solution into a graduated cylinder and diluting it with distilled water.
Calculate the volume in mL

of the nickel(II) chloride stock solution that the chemist should pour out.
When salt is poured on top of ice, the salt____.
a. raises the freezing point of water
b. lowers the freezing point of water
c. raises the melting point of ice
d. absorbs water, making the surface less slippery
e. none of the above
A 20.0-mL sample of benzene at 21.4 °C was cooled to its melting point, 5.5 °C, and then frozen. How much energy was given off as heat in this process? (The density of benzene is 0.80 g/mL, its specific heat capacity is 1.74 J/g · K, and its heat of fusion is 127 J/g.)

The Question
A 1.84 x 104 mg block of metal has the following dimensions: 0.5839 inches by 0.531 inches, by 0.4981 inches. Determine the density of the block in g/mL. Using the provided list of metals and their respective densities, what is the metal's identity?

Given:
titanium = 4.54 g/mL
zinc = 7.13 g/mL
tin = 7.31 g/mL
nickel = 8.9 g/mL


In the provided boxes, enter your numerical value of the density of the metal that you calculated, and then enter the correct units exactly as given in the problem. Do not enter answers in scientific notation.

Finally enter the identity of the metal from your list of choices above. Spelling and data entry count!
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