When using radial paper chromatography to separate ink pigments, does the least soluble or most soluble pigment travel the furthest distance? The solvent is water.

How many grams of dipotassium succinate trihydrate (K2C4H4O4·3H2O, MW = 248.32 g/mol) must be added to 600.0 mL of a 0.0481 M succinic acid solution to produce a pH of 5.946? Succinic acid has pKa values of 4.207 (pKa1) and 5.636 (pKa2).

1.Which type of radioactive emission is analogous to an electron being emitted?

positron, neutrons, alpha particle, gamma rays, beta particle

2. Which isotope is naturally radioactive?

⁴₂H, ²₁H, ¹⁶₈O, ²³⁴₈₈Ra

3. the half life of protactinium-231 is 3.5x10⁴ years. How long will it take for 10.4 grams of Pa-231 to decay to 2.6 grams?

4. the half life of phorphorous-33 is 25.3 days. How long will it take for 64 grams of p-33 to decay to 1.0 grams?

5. the half life of sr-83 is 32.4 hours. how many emissions are produced when 20 g of strontium-83 decas to 4.0 grams?

1. One liter of saturated actinium hydroxide solution contains .021 g of dissolved Ac(OH)3. Calculate Ksp for Ac(OH)3

CORRECT ANS: 8.8E-16 solve and explain pls

2. For a particular reaction at STP ( 298 K) CHANGE IN H= -297kJ/MOL AND CHANGE IN S= -113.3 J/MOL*K. At which of the following temperatures would the reaction become spontaneous?

CORRECT ANS: 2450 K

Solve and show steps

3. Rate data have been determined at a particular temp for the overall reaction 2NO + 2h2-> N2 + 2H2O IN WHICH ALL REACTANTS AND PRODUCTS ARE GASES

TRIAL INITIAL [NO] INTIAL [H2] INITIAL RATE (MS^-1)

1 .1M .2M .0150

2 .1M .3M .0225

3 .2M .2M .0600

(which column do you divide by what to get the power for determining that rate law expression?

4. Molten AlCl3 is electrolyzed for 5.0 hours with a Current of .4 Amps. Metallic Al is produced at one electrode and chlorine gas (Cl2) is produced at the other. How many grams of aluminum are produced?

CORRECT ANS: 0.67 g (EXPLAIN AND SHOW WORK PLS)

Question 5

A. How many mL of 0.1 M CH3COONa must you add to 35.0 mL of 0.50 M CH3COOH to make a buffer of pH 4.7? [pKa of H3COONa is 4.75]

B. Use the Henderson-Hasselbalch equation to calculate how many mL of 0.1 M HCl must you add to 100 mL of 0.10 M Tris base to make a buffer of pH 8.8? [pka of Tris Base is 8.08]

C. What is the pH when 25.0 mL of 0.200 M of H3COONa has been titrated with 35.0 mL of 0.100 M NaOH? Write out the balanced chemical equation.

D. You need to produce a buffer solution that has a pH of 4.68. You already have solution that contains 15.0 mmol of H3COONa. How many millimoles of H3COONa should you add to this solution?

The orbital potential energies for the 4s and 4p of Br are -18.65 ev and -12.49ev, respectively. Recall that the H 1s is -13.61ev. The MO diagram for HBr is not exactly the same as HF. Draw the MO diagram for HBr, including energy levels, each orbitals shape, each orbitals character (meaning what atomic orbitals contribute to each M.O. and how much), symmetry labels (e.g.  and , * and *), indicate the HOMO and LUMO, the bond order (show your work), whether the molecule is paramagnetic or diamagnetic. Now write a couple paragraphs comparing and contrasting the MO diagrams of HF and HBr in great detail (this last part is worth 50% of the points).

Consider the following species: Na, Mg, Cl^-1,S,Cl,Ar,Na^+

(a) Order the above species in order of increasing atomic/ionic radius.

(b) Order the above species in order of increasing electron affinity

Showing each step: Use the molecular weight of Tyrosinase, 128,000, to determine how many micromoles of Tyrosinase are in the tubes. Assume 5 mL of Tyrosinase is used and that it has a concentration of 15 mg/mL.  

Quinine occurs naturally in the bark of the cinchona tree. For centuries, it was the only treatment for malaria. Quinine contains two weakly basic nitrogen atoms, with Kb1=3.31 x 10^-6 and Kb2=.00000000135 at 25 C. Calculate the pH of a .011 M solution of quinine in water.

A 1.50 L buffer solution is 0.250 M in HF and 0.250 M in NaF. Calculate the pH of the solution after the addition of 0.0500 moles of solid NaOH. Assume no volume change upon the addition of base. The K_a for HF is 3.5 × 10^-4.​

How much PE does glucose have compared to gasoline (express as a percentage)?

An aqueous solution containing 7.22g of lead (II ) nitrate is added to an aqueous solution containing 6.02g of potassium chloride. Enter the balanced chemical equation for this reaction. Be sure to include all physical states.What is the limiting reactant?The % yield for the reaction is 84.1%, how many grams of precipitate were recovered? How many grams of the excess reactant remain?

With work shown.

7. Calculate the number of sodium atoms in 4.66 moles of sodium.

8. What is the molar mass fo a substance if 0.6502 moles of the substance has a mass of 19.27 grams?

9. How many grams are present in 7.5 moles of Cu (NO3)2?

10. How many atoms are present in a Mg sample with a mass of 14.6 grams?

11. How many atoms of H are present in 37.6 g of NH3?

12. How many atoms are present in 0.45 moles of P4O10?

13. The empirical formula of a compound is CH2O and it's formula weight is 120.12 amu. What is the molecular formula?

14. Analysis of an unknown sample indicated the sample contained 0.140g of N and 0.320 g of O. The molar mass of the compound was determined to be 92.02 amu. What is the molecular formula of the compound?

7-25 mL of 0.25 M HC2H3O2 are titrated with 0.25 M NaOH. a.What is the pH after 0mL of NaOH have been added? b.What is the pH after 15mL of NaOH have been added? c.What is the pH after 25 mL of NaOH have been added? d.What is the pH after 30mL of NaOH have been added? I need to have the answer as detailed as possible with all tables and work shown