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Humans have used many chemicals substances to help improve their lives. In some cases, these chemicals are becoming less effective than they originally were. Discuss the growing problems of antibiotic resistance in bacteria, pesitcide resistance in insects, and herbicide resistance in plants in terms of evolutionary concepts. How did these problems arise, how might they grow worse, and how might they be solved?
If the partial pressure of a gas produced in a reaction was determined to be 0.35 atm in a 161.0 mL container and at a temperature of 25.0°C, how many moles of gas were produced? (Hint: Use the ideal gas law and convert temperature to Kelvin, volu..
Calculate the mass percent of carbon in the compound and calculate What is its final temperature
Rubidium has two common isotopes, 85Rb and 87Rb. If the abundance of 85Rb is 72.2% and the abundance of 87Rb is 27.8%, what is the average atomic mass of rubidium.
How much of this rock (in kg ) must be processed to obtain 5.5 metric tons of lead? (A metric ton is 1000 kg.) Express your answer using two significant figures.
In the preparation of amides, acid chlorides or anhydrides may be used to react with the selected amine. It is known that acid chlorides are more reactive than the corresponding anhydrides in this type of nucleophilic acyl substitution reaction.
To a buffer solution containing 0.100M of HNO2 and 0.150M of KNO2 with calculations determine if the added amount of the following compounds exceeds its buffer capacity.
Which of the following substances would be most efficient per unit mass at melting snow from sidewalks and roads: glucose, sodium chloride, ethylene glycol, or calcium nitrate. Your explanation should include possible environmental impact.
How much heat, in calories, does it take to warm 540 grams of water from 11.0 degrees Celsius to 37.0 degrees Celsius
An X-ray has a wavelength 1.44A. Calculate the energy in J of one photon of this radiation.
A tablet containing 500.0 mg of aspirin (acetylsalicylic acid or HC9H7O4) was dissolved in enough water to make 100 mL of solution. Given that Ka = 3.0 × 10-4 for aspirin, what is the pH of the solution
apply to NHCl3. A. polar bonds B. nonpolar molecule C. triangular-planar molecule shape D. sp2 hybirdized
A 0.140-mole quantity of CoCl2 is added to a liter of 1.20M NH3 solution. What is the concentration of Co^2+ ions at equilibrium. The formation constant of Co(NH3)6^3+ is 5.0*10^31.
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