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Why are the coldest temperatures at 50km height from the surface of the earth, occur generally at tropical tropopause?
Assume that all the lead now present in the rock came from the radioactive decay of the uranium and that no appreciable amounts of other radioactive nuclides are present in the sample. The half-life of uranium-238 is 4.51 x 109 years. What is the ..
what is the molar mass of a sample of gas that has a dnesity of 1.09 g/L at 1.02 atm pressure and 25.0C.
Write a Lewis structure that obeys the octet rule for each of the following ions. Assign formal charges to each atom. Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all lone pairs of electrons. Show the form..
Which of the following statements is/are correct. i. KBr, HClO3, and HClO2 are strong acids ii. NaH, KOH, and Li2O are strong bases iii. HI, HClO3, and HNO3 are strong acids
(A) Solid magnesium carbonate reacts with an aqueous solution of perchloric acid. Express your answer as a balanced chemical equation. Identify all of the phases in your answer.
To determine the molar mass of an unknown protein, 1.00 mg was dissolved in 1.00 mL of water. At 25.0°C the osmotic pressure of this solution was found to be 1.47 × 10-3 atm.
An ionic compound forms when calcium (Z = 20) reacts with iodine (Z = 53). If a sample of the compound contains 1.29x10^19 calcium ions, how many iodide ions does it contain
A solution is made by dissolving 0.732 mol of nonelectrolyte solute in 837 g of benzene. Calculate the freezing point and boiling point of the solution.
A variation of this experiment uses a balloon as the container for the carbon dioxide. Describe any additional measurements that you must make in order to find the molar mass by this method.
n2h4l o2g reverse reaction arrow n2g 2 h2olcalculate the k value associated with the reaction at 25 degrees celcius
a 12-gram mixture of methane ch4 and ethane c2h6 is completely combusted in oxygen. if the total mass of co2 produced
Arrange the following atoms in order of decreasing atomic radius. Rank from largest to smallest. To rank items as equivalent, overlap them. Ge, Si, I, O
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