Be sure to answer all parts. In 2006, an ex-KGB agent was murdered in London. Subsequent investigation showed that the cause of death was poisoning with the radioactive isotope 210Po, which was added to his drinks/food. (a) 210Po is prepared by bombarding 209Bi with neutrons. Write an equation for the reaction. Show the mass number and atomic number of all species. Tip: use the sup-subscript button to insert all symbols. (b) Who discovered the element polonium? Marie and Pierre Curie Enrico Fermi (c) The half-life of 210Po is 138 d. It decays with the emission of an α−particle. Write an equation for the decay process. Show the mass number and atomic number of all species. Tip: use the sup-subscript button to insert all symbols. (d) Calculate the energy of an emitted α−particle. Assume both the parent and daughter nuclei to have zero kinetic energy. The atomic masses are: 210Po (209.98285 amu), 206Pb (205.97444 amu), α−particle (4.00150 amu). (Enter your answer in scientific notation). × 10 J (e) Ingestion of 1.0 mg of 210Po could prove fatal. What is the total energy released by this quantity of 210Po, assuming every atom decays? (Enter your answer in scientific notation). × 10 J

how many 1/2 teaspoons of salt will dissolve in 1/2 cup room temp. water and how many in boiling water and why?

Under EPA regulations, chemical waste that possesses at least one of four defined characteristics is classified as hazardous waste. Which of the following is not one of the four characteristics of hazardous waste?

2.,
Many organic chemicals can oxidize during storage to form peroxides. What is the primary hazard associated with formation of peroxides?

3.

Which statement best describes the fire safety significance of the flash point of a liquid?

Please give me answers!

A 45.00 -mL sample contains 0.754 g of KHC₈H₄O₄, known as KHP . This sample is used to standardize an NaOH solution. At the equivalence point, 43.30 mL of NaOH have been added.

K_a( HC₈H₄O₄^-) = 3.9E-6

a) What was the concentration of the NaOH?

b) What is the pH at the equivalence point?

4) You have decided to make swords to sell to rich, spoiled yuppies who like to dress up in archaic clothing.   The swords need to be realistic in mechanical properties and performance. Describe the mechanical properties of a sword blade and how these properties would be achieved. ?

Please explain in clear words. Thanks

Prelab GALVANIC CELLS: THE NERNST EQUATION Cl-1 + MnO4-1  Mn+2 + Cl2 1. Balance the equation using the ion-electron (half-cell) method. Assume acidic solution. 2. Calculate the Eocell . 3. Calculate Ecell when Mn+2 and Cl-1 are each 1.0 M, MnO4-1 is 1.0 x 10-4 M, Cl2 is at 1 atm pressure, and the pH is 3.00. 4. Calculate the equilibrium constant, Keq, for the reaction.

When naming organic compounds with IUPAC rules, when is "iso" used?? The one I was naming turned out to be 4-isopropyloctane. WHY???

How many 1 gigawatt hydro or wind power ‘plants’ would be required to generate all of the electricity require in the US?

A beaker with 1.10×10² mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 4.90 mLof a 0.380 M HCl solution to the beaker. How much will the pH change? The pKa of acetic acid is 4.740.

Express your answer numerically to two decimal places. Use a minus ( − ) sign if the pH has decreased.

Calculate the total ionization energy for the formation of C⁴⁺ from a gaseous C atom.

The balanced equation for the reaction of aqueous Pb(ClO3)2 with aqueous NaI is shown below. What mass of precipitate will form if 1.50 L of concentrated Pb(ClO3)2 is mixed with 0.200 L of 0.190 M NaI? Assume the reaction goes to completion.

The concept of entropy, and the second law of thermodynamics have often been used ( usually misused in reality) to " explain" all kinds of things. It is frequently up to chemists to set the record straight in such cases. One argument that has been used to "disprove" evolution goes something like this: "Living beings are more complex than nonliving systems. Furthermore, humans are more biologically complex than lower life forms such as monkeys. Entropy is a measure of randomness, the opposite of complexity. The evolution of life from non life, or of a more complex organism from less complex ones must then increase the organizational complexity, and thus decrease the entropy." The second law of thermodynamics tells us that in a spontaneous process the entropy must increase and can never decrease. Therefore spontaneous evolution, either as the ultimate source of life, or or in the development of more complex living systems, is impossible. From the thermodynamic perspective, this statements fatally flawed. A. Explain why it is flawed B. What would a correctly applied entropy argument say about evolution?

A coal contains 73.0 wt% C, 4.7% H (not including the hydrogen in the coal moisture) 3.7% S 6.8% H2O, and 11.8% ash. The coal is burned at a rate of 50,000lbm/h in a power plant boiler with air 50% in excess of that needed to oxidize all the carbon in the coal to CO2. The air and coal are both fed at 77�F and 1 atm. The solid residue from the furnace is analyzed and is found to contain 28.7 wt% C. 1.6% S. and the balance ash. The coal sulfur oxidized in the furnace is converted to SO2 (g) Of the ash in the coal 30% emerges in the solid residue and the balance is emitted with the stack gases as fly ash. The stack gas and solid residue emerge from the furnace at 600�F. The higher heating value of the coal is 18,000 Btu/lbm. (a) Calculate the mass flow rates of all components in the stack gas and the volumetric flow rate of this gas. (Ignore the contribution of the fly ash in the latter calculation, and assume that the stack gas contains a negligible amount of CO.) (b) Assume that the heat capacity of the solid furnace residue is 0.22 Btu/(lbm F), that of the stack gas is the heat capacity per unit mass of nitrogen, and 35% of the heat generated in the furnace is used to produce electricity. At what rate in MW is electricity produced?

In a chemical reaction, exactly 2 mol of substance A react to produce exactly 3 mol of substance B.

2A->3B

How many molecules of substance B are produced when 29.7g of substance A reacts? The molar mass of substance A is 28.8 g/mol.

Step 1: Convert the mass of A to moles.

Step 2: Convert the number of moles of A to the number of moles of B.

Step 3: Convert the number of moles of B to molecules of B.