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1. Can a chemists make the molecules of life in a laboratory? 2. What makes biomolecules special? 3. Which came first the catalysts or the hereditary molecules? 4. What are most important organelles? 5. Is How does biochemistry describe life processes? 6. there a simple basis for classifying organisms? 7. What is the source of energy in life processes? 8. What kind of energy changes take place in living cells?
A gas sample containing 0.3525 moles of a compound is trapped in a 2.641 liter vessel on a manifold at a temperature of 28.4 oC. What is the pressure in the vessel,
If the density of the solution is 1.1094 g/mL, what is the molarity of the sulfuric acid?
when 31g of phosphorus reacts with oxygen, 71g of an oxide phosphorus is the product. What mass of oxygen is needed to produce 13g of this product?
PCl5 + 4H2O > 5HCl +H3PO4. How many total moles of acid are formed when starting with 4.5 g of PCl5 and excess H2O.
The Ksp for PbBr2 = 8.9 x 10^-6. Calculate the molar solubility of this compound on a .20M Pb(NO3)2.
The reaction of calcium hydride with water can be used to prepare small quantities of hydrogen gas, as is done to fill weather observation balloons.
Natural lithium is 92.58% lithium-7, with atomic weight 7.016, and 7.42% lithium-6, with atomic weight 6.015. What is the observed atomic weight of lithium as it occurs in nature?
What is the percent yield if 6.25 g S2Cl2 is isolated from the reaction of 10.0 g S8 and 7.50 g Cl2?
Calculate what will be the amount of heat, q, absorbed by the calorimeter apparatus also express your answer in kJ? (heat capacity = 2.677 x 103 J/K)
A carboxylic acid favours the ion form (R-COO-) and its pH is higher than its pKa. In most membranes, the polar heads of the phospholipids align towards the middle of the membrane.
A gas occupies a volume of 458 mL at a pressure of 1.01 kPa and a temperature of 295 K. When the pressure is changed, the volume becomes 477 mL.
The density of benzene at 15C is 0.8787 g/mL. Calculate the mass of 0.1500 L of benzene at this temperature.
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