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The half-lives of different radioisotopes are given in the table below. How long would it take (in minutes) for the amount of argon-44 to decrease from 28.0 mg to 3.50 mg?
argon-44 / 12
lead-196 / 37
potassium-44 / 22
indium-117 / 43
Which of the following is a homogeneous mixture? Which of the following represents a chemical change, rather than a physical change? Which of the following pairs of symbol & element is incorrect?
Suppose that 27 g of each of the following substances is initially at 29.0 C. What is the final temperature of each substance upon absorbing 2.45 kJ of heat?
3H2 + N2 -> 2NH3. At 200 degrees C in a closed container, 1.00atm of nitrogen gas is mixed with 2.00atm of hydrogen gas. At equilibrium, the total partial pressure is 2.00atm.
a solution is prepared by dissolving 396 grams of sucrose in 624 grams of water. what is the vapor pressure of this solution at 30 degrees celsius.
In the 1980s, there was an international agreement to destroy all stockpiles of mustard gas, ClCH2CH2SCH2CH2Cl. When this substance contacts the moisture in eyes, nasal passages, and skin
At 900 degrees C, titanium tetrachloride vapor reacts with molten magnesium metal to form solid titanium metal and molten magnesium chloride
Consider ATR sampling using a trapezoidal ZnSe crystal. In the mid-infrared region, refractive indices for ZnSe and water are approximately 2.4 and 1.3, respectively. What is the penetration depth (?m) for IR radiation of 1600 cm-1 if it strikes t..
Find the mass of the sugar (C6H12O6) required to produce 1.82 L of carbon dioxide gas at STP from the reaction?
It takes 55.0 J to raise the temperature of an 8.80 g piece of unknown metal from 13.0C to 25.0C. What is the specific heat for the metal? Express your answer numerically, in J/g. C
If you fill the larger tank with oxygen to a pressure of 155atm , to what pressure should you fill the acetylene tank to ensure that you run out of each gas at the same time? Assume ideal behavior for all gases.
Solids do not "flow". What does this behavior imply about the speeds at which the individual solid particles are moving relative to each other?
Predict stereochemistry of the products formed if the addition of bromine to fumaric acid occurs via Syn addition
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