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What intermolecular force holds together the 2 strands of DNA and is also important for the secondary and tertiary structure of proteins?
A 30.0 mL sample of sulfuric acid (H2SO4) is completely neutralized by 20.0 mL of 0.25 M sodium hydroxide (NaOH) solution. What is the molarity of the sulfuric acid solution?
A 2.51 g ore sample dissolved in acid required 28.62 mL of 0.0821 M KMnO4 to reach the equivalence point. Calculate the mass percent of iron in the ore.
Problem- In the compound CCl4 (tetrachloromethane), carbon has 4 covalent bonds, how many total pairs of nonbonding electrons is in the Lewis structure for that compound
What is the value of Kf for acetic acid, given that its freezing temperature is 16.6 C and its density is 1.049 g/mL?
It is very desirable that pesticides eventually decompose in the environment to give harmless products. Let us assume the half life for the first order decomposition of a certain pesticide is 10.2 years. If the present concentration of a pesticide..
How does electron confinement in an ion or molecule affect its color?
what is the identity of the atom a when a solution containing 634 grams of acl3 was permitted to combine with an excess
Select a suitable substance to be sealed within the vial. (b) Within less than 10% error, what magnitude of pressures must the vial withstand?
if a container of nitrogen, oxygen, carbon dioxide has a pressure of 2.00atm and the partial pressure of O2 is 312torr,
How many grams of dry NH4Cl need to be added to 1.80 L of a 0.800 solution of ammonia, NH3, to prepare a buffer solution that has a Kb of 8.87? for ammonia is 1.8E-5.
acetylene gas c2h2 is produced by adding water to calcium carbide cac2.cac2 s 2 h2o l -----gt c2h2 g caoh2 aqhow many
22.4 liters of a gas weighs 70g at S.T.P. Calculate the weight of the gas if it occupies a volume of 20 liters at 27C and 700mm Hg of pressure
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