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Problem- Using the concept of effective nuclear charge and sheilding , explain why alkali metals have relatively low first ionization energies
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Problem- A 250 ml buffer solution is 0.250 M in acetic acid and 0.250 M in sodium acetate. What is the initial pH and what is the pH after the addition of 0.0050 HCL. What is the pH after the addition of 0.0050 NaOH
Calculate the number of moles of magnesium, chlorine, and oxygen atoms in 8.30 moles of magnesium perchlorate Mg(ClO4)2
In a titration of 38.16 mL of 0.1234 M hydrazoic acid (HN3, Ka = 1.900x10-5) with 0.08559 M KOH, what is the pH after 87.78 mLs of titrant have been added
For the reaction above, how much would be liberated by the combustion of 5.00g of iron metal in excess oxygen.
69.6 grams of ice initially at -5°C is added to 301 grams of liquid water initially at 39.1°C in a thermally insulated container. What is the temperature of the water once the contents of the container reach thermal equilibrium
What is the mole fraction of solute and the molal concentration for an aqueous solution
an unknown solution contains only two absorbing species thymol blue and methylthymol blue. this sample had absorbance
Question- How many moles of KBr are present in 25 mL of a 1.5 M solution? If the KBr were isolated and dried, how much would it weigh
The pressure in a gas arises because the particles of a gas strike each other and the walls of their container, exerting a ________. The larger the number of gas particles in a particular volume, the _______ the pressure within the gas.
distilled Solution D: 9.08 (m/v) glucose Solution E: 5.0 (m/v) glucose and 0.9 (m/v) Where does each solution go under 1. Crenation, 2. Hemolysis, 3. Neither. Each solution should be placed under one of the 3 named.
Propose a mechanism for the acid-catalyzed syntheis of 4,5-dimethyl-dioxxolane from formaldehyde and 2,3-butanediol
Problem- A solution is made by dissolving 15.0g of HNO3 in 700.0mL of water. Calculate the pH of the solution. If 0.0300g NaOH is added to 250mL of this HNO3 solution, what will the pH be after mixing the 250mL of HNO3 and the solid NaOH together?
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