The temperature of the nickel equilibrium changed when acid was added. Explain the source of the change.

How many milliliters of 1.00 M KOH should be added to 4.90 g of phosphoric acid (MM= 98.0g/mol) to give a pH of 11.00 when diluted to 1000 ml? (Ka1=7.11 x10-3, Ka2=6.32x10-8, Ka3=4.5x10-13)

Consider the reaction C2H6 2CH3 at a temperature where the half-life is 38.6 minutes. What is the first order rate constant at this temperature? k = 0.018 Correct: Your answer is correct. min-1 How long would it take for the concentraton of C2H6 to drop from 3.0 mM to 0.6 mM? t = min If the initial concentration is 3.0 mM, what would the concentration be after 11.0 minutes? [C2H6] = mM How long would it take to convert 95% of C2H6 at this temperature? t = min

Molecules CH₃CH₂CH₂CH₂OH and CH₃CH₂CH₂CH₂NH₂, in the absence of any other molecules, can interact with each other via non-covalent interactions that include the following

Calculate the maximum mass (in grams) of the following metal sulfides that can be dissolved in 1.0 L of a solution that is 4.90×10−5 M in Na2S.

A. PbS

B. ZnS

Q.N.1) Electrohoresis tools and terms: Use the terms from the word bank at the top of the page to fill in the blanks.

Word bank:

                 Agarose gel, buffer, casting the jel, chamber , comb, digital micropipet, electrodes, gel bed, loading the jel, microliter, microtube, sample well

1.) ------------------------------------a small plastic tube with a cap which holds small quantities of sample.

2.) ----------------------------------a devise used to measure and deliver tiny quantities of sample.

3.) ------------------pouring liquified agarose into the jel tray and allowing it to solidify.

4.) -----------------------a rectangular hole in the gel into which the sample is loaded.

5.) -------------------a temlate used to make wells in the gel.

6.) ---------------------------contains microscopic pores which acts as a molecular sieve.

7.) ------------------------- the process of pipetting the samples into the wells in the gel.

8.) ---------------------the holder into which the gel is molded.

9.) ------------------ a unit of measurement for tiny quantities of a liquid.

10.) -------------------the box which holds the gel, gel tray, and buffer.

11.) ------------------- the negative and positive electrical contacts within the chamber.

12.) ------------------- the solution in which the is submerged:it contains electricity and controls PH

The most abundant isotope of strontium, Sr-88, contains thirty-eight protons and fifty neutrons and has a mass of 87.9056 u.

a)What is the mass defect for this nucleus in atomic mass units? In kilograms? atomic mass units u

b) kilograms kg

Determine the purity of an Aluminum can. In words how would you determine the purity? Also, make up random numbers to calculate how to find the purity of an Aluminum can.

1) Fill in columns 1-7 of the table

Three major spectroscopic methods for elemental analysis atoms are Atomic Absorption Spectroscopy, Atomic Emission Spectroscopy, and Atomic Mass Spectroscopy. Describe 3-4 major parts of the experimental setup for each of the three methods.

Determine the pH of a solution when 26.6 mL of 0.029 M HNO3 is mixed with 16.7 mL of....

A) 0.0120 M NaOH. D) 0.144 M KOH

B) distilled water

C) 0.0060 M HCl

The enthalpy change is -400 kJ for reaction: 2 Al(s)+ 3/2 O2(g) ? Al2O3(s). What is the ?H for the following reaction? 2 Al2O3(s) ? 4Al(s) + O2(g) is

Calculate E_cell for the following electrochemical cell:

Pt/Fe²⁺ (0.0725M), Fe³⁺ (0.110M)// MnO4^- (0.0822M), H⁺ (1.00M), Mn²⁺ (0.0205M) /Pt

Redox Reactions

1) What distinguishes a redox reaction from a chemical reaction such as a double replacement?

2) COnsider the following unbalanced net ionic redox equation.

VO₂⁺+SO₃^2- -> VO⁺+SO₄^2-

a) Name the oxidizing agent in this reaction.

b) Name the ion that is oxidized in this reaction.

c) Balance this net ionic redox equation in acidic solution.