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Assignment
1) When calculating the density of a liquid you measure 8.2 mL in a graduated cylinder with markings every 1 mL and measure the mass on a balance 9.548g. What is the density of this liquid with significant figures?
2) Consider the density calculation in problem 1. If you wanted to have a more precise density measurement typically that means spending money on better equipment. Would you spend money to (a) improve the volume to measurement to 0.01mL or (b) improve the mass measurement to 0.0001g or (c) improve both the volume and mass measurements? Briefly Explain
3) Which is more precise (a) a 25mL Graduate cylinder with markings every 1 mL or (b) a 50 mL Buret with markings every 0.1mL? Briefly Explain
After you have made your observations, you can release the vacuum and allow the pressure inside to return to atmospheric pressure. Do this by removing the pumper and squeezing the rubber septum as indicated.
A physiological saline solution is 0.92% sodium chloride (NaCl) by mass and has a density of 1.005 g/mL. What is the osmotic pressure of such a solution at body temperature of 37 degree C
What is the theoretical yield of aluminum oxide if 2.80 mol of aluminum metal is exposed to 2.40 mol of oxygen? Express your answer numerically in moles.
1. compare and contrast the nitrogen requirements of microorganisms and higher forms of life describing how their
A vessel contains 3.00 mol of Ar, 5.50 mol of CF4, and 1.50 mol of C2H6 gases. If the partial pressure of Ar is 1.440 atm, what is the total pressure inside the vessel
Identify the following compound from its IR and proton NMR spectra. C4H6O: NMR: ? 2.43 (1H, t, J = 2 Hz); ? 3.41 (3H, s); ? 4.10 (2H, d, J = 2 Hz) IR: 2125, 3300 cm1
If someone gave you a sample of metallic element, explain what physical properties might you use to identify the element? Presume you have a reference such as the handbook of chemistry and physics that lists physical properties of the elements.
Question- Part 1) what is the density of He at STP. why do helium-filled balloons rise in air. Part 2) if 16.0g of O2 and 2.2g CO2 are placed in a 5.00-L container at 21C, what is the pressure of this mixture of gases.
Carryout the following conversions. Report your answer to the correct number of significant figures
Naturally occuring iodine is iodine-127. medically, radioactive isotopes of iodine-125 and iodine-130 are used. a)write the atomic symbol for each isotope. b)in what ways are the isotopes similar, and in what ways do they differ
Based on the reaction of halide ions NaI,NaBr,NaCl with KMnO4 rank the three halide ions in order of decreasing reducing agent strength. Use to indicate greater strength and = to mean equall strength.
What is the definition of a "mole" of a substance? What is meant by the molar mass of a substance? Why is the mole a convenient quantity to use in chemistry?
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