Choose the best instrument for the situation and list a reason why (NMR, GCMS, LCMS, or IR)

1. Cattle farmers suspect that a nearby water source is contaminated with pesticide run-off from an adjacent farm and is causing health issues in their cattle.

2. An ink sample, collected at a crime scene, contains a unique set of organic dyes and chemicals that could identify the brand and type of pen used.

A city has 450,000 people. Suppose each person produces around 2 kg of waste daily that goes into landfills. (a) How much methane, in moles, would be produced if all of this waste was cellulose (-CH₂O-) based and could react anaerobically into methane? (b) How many homes could be heated from this is each person used 10⁸ kJ of energy per year if this methane was saved and combusted (heat of combustion for methane is -890 kJ/mol).

1.Explain how you could use the simple laboratory tests performed in this experiment to distinguish bet the following compounds

a. 2-pentanone and 3-pentanone

b. 3-pentanone and pentanal

c. Benzalehyde and acetophenone

d. Acetaldehyde and propionaldehyde

2. In the separation of t-butyl chloride from the reaction mixture, what is the purpose of the following washes?

a. cold water b. sodium bicarbonate c. water

3. Benzyl chloride, though a primary halide, readily forms a precipitate when treated with 2% ethanolic silver nitrate. Explain.

1) How many H^- ions are around each Na⁺ ion in NaH, which has a cubic unit cell with H^- ions on each corner and each face?

2) An atom has a radius of 165 pm and crystallizes in the body-centered cubic unit cell. What is the volume of the unit cell in cm^3?

3) A substance has a triple point at a temperature of 17 ∘C and a pressure of 3.2 atmospheres. In what states can the substance exist on the surface of Earth at sea level (open to the atmosphere)? Check all that apply.

An aqueous solution contains 0.100 M Ce3+; 1.00 × 10-1 M Ce4+; 1.00 × 10-4 M Mn 2+; 0.100 M MnO4 - and 1.00 M HClO4 at 298 K.

You are given:

Ce4+ + e-  Ce3+ E° = 1.70 V

MnO4 - + 8H+ + 5e-  Mn2+ + 4H2O E° = 1.507 V 5.

(a) Write a balanced net reaction that can occur between the species in this solution and calculate its E° value.

(b) Calculate ΔG° and K for the reaction at 298 K.

(c) Calculate the total E for the net reaction in part (a) at 298 K.

(d) At what pH would the concentrations of Ce3+, Ce4+, Mn2+ and MnO4 - listed above be in equilibrium at 298 K?

What is the molar solubility of nickel(II) sulfide in 0.053 M KCN? For NiS, K_sp = 3.0

What is the pH of a solution that is 0.64M H2SO4 and 1.7M HCOOH (formic acid)?

Express your answer using two decimal places.

Two hydrogen atoms can combine to form H2 but two He atoms cannot form He2 — Justify from MO viewpoint.

1. Why alcohols need to be activated in order to have the hydroxyl group substituted?

2. What is carbocation rearrangement? Why in some particular reactions there is no carbocation rearrangement even if there is a carbocation?

How many grams of Boron are produced when 21.77g of B2O3 are allowed to react with 27.52g of Mg?

B2O3 + 3Mg --> 2B + 3MgO

For Heat Effects and Calorimetry Lab: For the Heat of Reaction part

Why do salts that have pickedup a little moisture have J/gram values much less than their literature value?

Describe tie lines in a ternary diagram.

For each of the following statements, provide an explanation: a)The Cl- ion is larger than Cl atom b)The S2- ion is larger than the O2- ion c)The K+ ion is larger than the Ca2+ ion

If you were to place a piece of wood and a piece of metal outside to bake in the sun for an hour the metal would feel much hotter than the wood when you touched it. What is the reason for this? Can you tell me some website that explains about this also. Thank you.

What is the isoelectric point of the following tetrapetide that contains the amino acids represented by the single letters “DREN”, such that D is at the amino-terminal end of the peptide and N is at the carboy-terminal end.