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Describe the Law of Conservation of Mass. How is this law related to chemical reactions and the need to write balance chemical equations? Can you think of an example chemical reaction you may see in everyday life? Describe how you know mass is conserved in that reaction.
German physicist Werner Heisenberg related the uncertainty of an object's position (?x) to the uncertainty in its velocity ?v. The mass of an electron is 9.11× 10-31 kg. What is the uncertainty in the position of an electron moving at 3.00 × 10^6 ..
If 26.0 g of ammonia gas has a temperature of -6.70 C and a pressure of 535mmHg , what is its volume
In a treatment that decreases pain and reduces inflammation of the lining of the knee joint, a sample of dysprosium- 165 with activity of 1100 counts per second was injected into the knee of a patient suffering from rheumatoid arthritis.
If the heat capacity of the calorimeter itself (not including the internal water) is 20.4 J/°C and the final temperature of the calorimeter and water bath is 23.3 °C, what is the enthalpy of combustion of the new compound?
If the water in your house has 1000.0 mg/L of calcium carbonate dissolved in it, How many grams of sodium oxalate could you mix with 100.0 mL of that water before a precipitate would form
A 72.0 mL volume of 0.25 Moles HBr is titrated with 0.50 Moles KOH. Calculate the pH after addition of 36.0 mL of KOH
In the spinach extraction, indicate which of the following solvents may or may not be suitable as a replacement for the hexane used in the experiment: acetone, diethyl ether, ethanol. Briefly explain your choices.
Choose one of the oxidative protection enzymes, other than superoxide dismutase. Describe the metal containing active site, the general structure of the protein and the specific chemistry it catalyzes.
The heat of fusion of water is 6.01kj/mol, and the molar heat capacity is 36.6 J/(K*mol) for ice and 75.3 J/(K*mol) for liquid water.
A gas occupying a volume of 395 mL at a pressure of 0.970 atm is allowed to expand at constant temperature until its pressure reaches 0.541 atm. What is its final volume?
Dehydrohalogenation Prepare styrene (C6H5CH=CH2) by dehydrohalogenation of either 1-bromo-2-phenylethane or 1-bromo-1phenylethane using KOH in ethanol.
What is the maximum number of electrons in an atom whose highest-energy electrons have the principal quantum number n=5
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