Acodofocation of sodium bicarbonate(NaHCO3) produces carbon dioxide in a two-step process. The first step produces carbonic acid (H2CO3). Write and balance the molecular equation for the first step of the reaction of sodium bicarbonate with HF.
The second step is the decompostion of a carbonic acid to ccarbon dioxide. Write and balance the molecular equation for the second step.
Now write the overall net ionic equation for te acidification of NaHCO3 to produce CO2.
What is the molar ratio of CO2 produced to NaHCO3 decomposed?
What mass of CO2 will be produced by the complete decompostion of 1346 mg of NaHCO3?
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When discussing CFCs (chlorofluorocarbons), what are the properties of that chemical (such as water solubility, vapor pressure, etc.) that determines its migration in our environment?
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Nickel metal will react with CO gas to form a compound called nickel tetracarbonyl (Ni(CO4)) which is gas at temperatures above ~45C.
A 1.50 L glass bulb is filled with CO gas to a pressure of 1.20 atm at 73C and then 0.5869 g is pure Ni is added. If the reaction described above occurs and goes to completion at constant temperature, what will the final total pressure in the bulb be?
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Explain how you would prepare a 5 M solution of sulfuric acid from 100mL 18 M H2SO4. Show all necessary work.
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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
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how many 1/2 teaspoons of salt will dissolve in 1/2 cup room temp. water and how many in boiling water and why?
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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?
| reactivity |
| corrosivity |
| volatility |
| toxicity |
2.,
Many organic chemicals can oxidize during storage to form
peroxides. What is the primary hazard associated with formation of
peroxides?
| The peroxides formed can become shock sensitive if present in sufficient concentrations and may be an explosion hazard. |
| Increased flammability. |
| Increased risk of bladder cancer. |
| All of the above |
3.
Which statement best describes the fire safety significance of the flash point of a liquid?
| A lower flash point correlates to a higher fire hazard. |
| A lower flash point correlates to a lower fire hazard. |
| A chemical with a lower flash point is easier to extinguish than a chemical with a higher flash point. |
| The flash point of a liquid has no significance to fire safety. |
Please give me answers!
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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.
Ka(
HC8H4O4-)
= 3.9E-6
a) What was the concentration of the NaOH?
b) What is the pH at the equivalence point?
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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
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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.
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When naming organic compounds with IUPAC rules, when is "iso" used?? The one I was naming turned out to be 4-isopropyloctane. WHY???
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How many 1 gigawatt hydro or wind power ‘plants’ would be required to generate all of the electricity require in the US?
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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.
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| ΔpH= |
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