1. Explain in terms of ion concentrations and Ksp why a precipitate forms for some solutions.

2. When ammonia is added to a solution that has Cu(OH)2(s) precipitate in it, the precipitate dissolves. Use Le Châtelier’sprinciple to explain this.

3. Based on your observations, when a colour change occurs but no phase change occurs, what kind of reaction might have occurred?

Choose all of the processes from below which describe changes which are independent of the path by which the change occurs.

the elevation increase experienced by a traveller travelling from Grand Isle, LA to Denver, Colorado


the work generated by the body of an athlete as it metabolizes the sucrose in a cube of sugar


the heat evolved when a cube of sugar is oxidized to CO₂(g) and H₂O(g)


the distance travelled by a steer in a rodeo attempting to evade capture


the amount of work required to build a house


the heat generated by a car engine as it burns a gallon of gasoline


the longitude decrease experienced by a traveller travelling from Baton Rouge, LA to London, England

Calculate the freezing point of a solution of 30.0 g methyl salicylate, C7H6O2, dissolved in 800. g of benzene, C6H6. Kf for benzene is 5.10

Find the IR and NMR spectra of Ibuprofen from the internet. Label the peaks and please give a detailed interpretation of the charts.

Use a table of thermodynamic data to calculate the enthalapy (delta H) for the following three reactions:

Mg (s) + 1/2 O2 (g) --> MgO (s)

Mg (s) + 2 HCl (aq) -----> MgCl2 (aq) + H2 (g)

MgO(s) + 2HCl(aq) ----> H2O(l) + MgCl2(aq)

The equilibrium constant, K, for the following reaction is 1.20×10-2 at 500 K. PCl5(g) PCl3(g) + Cl2(g) An equilibrium mixture of the three gases in a 1.00 L flask at 500 K contains 0.218 M PCl5, 5.11×10-2 M PCl3 and 5.11×10-2 M Cl2. What will be the concentrations of the three gases once equilibrium has been reestablished, if 3.92×10-2 mol of PCl3(g) is added to the flask? [PCl5] = M

[PCl3] = M

[Cl2] = M

28 mL of 0.10 M HCl is added to 60 mL of 0.10 M Sr(OH)2. Using proper unit cancellation, determine the concentration of OH− in the resulting solution.

For the diprotic weak acid H2A, K a1 = 3.1 × 10 − 6 and K a2 = 7.2 × 10 − 9 . What is the pH of a 0.0500 M solution of H 2 A ? pH =

What are the equilibrium concentrations of H 2 A and A 2 − in this solution?

[ H 2 A ] =

[ A 2 − ] =

Which 3 of the following process techniques will enhance the number of die from each wafer ?

12. Liquid nitroglycerin is a shock sensitive compound that produces gases in an exothermic (heat releasing) reaction shown below.

4C₃H₅(NO₃)₃ (l) → 6N₂(g) + 10H₂O (g) + 12CO₂ (g) + O₂ (g)

If 16 ounces (454 g) of nitroglycerin is detonated in a 0.500 L container and the temperature of all the gases produced is 175 oC, what is the total pressure in the container?

(a) 417 atm

(b) 805 atm

(c) 1070 atm

(d) 208 atm

Please check it out within 30 minutes. Please provide explanation or working so I can check with my answer.

Question: In a study of the system, Cl2(g) + Br2(g) 2BrCl(g), several different reaction mixtures were prepared, placed in a 15.00 × 10–3 m3 container, and allowed to reach equilibrium at 350 K. Despite having different starting compositions, three of the four mixtures had an identical composition at equilibrium. Which one of the systems has a different equilibrium composition than the others?

Select 1:

a. System 1: 0.100 moles of Cl2, 0.000 moles of Br2 and 0.600 moles of BrCl

b. System 2: 0.250 moles of Cl2, 0.150 moles of Br2 and 0.300 moles of BrCl

c. System 3: 0.400 moles of Cl2, 0.300 moles of Br2 and 0.000 moles of BrCl

d. System 4: 0.300 moles of Cl2, 0.250 moles of Br2 and 0.250 moles of BrCl

The energy needed for the following process is 1.960 × 104 kJ/mol:

Li(g) → Li3+(g) + 3e−

If the first ionization energy of lithium is 5.20 × 102 kJ/mol, calculate the second ionization energy of lithium—that is, the energy required for the process:

Li+(g) → Li2+(g) + e−

A hydrogen-like ion is an ion containing only one electron. The energies of the electron in a hydrogen-like ion are given by

En = −(2.18 × 10−18 J) (Z2)(1/n2)

where En is the energy of the electron in the hydrogen-like ion, n is the principal quantum number, and Z is the atomic number of the element.

Second ionization energy of lithium:   kJ/mol (Enter your answer in scientific notation)

1. We wish to produce a product B from a reactant A in a PFR with Q = 4 L/min and CA0 = 2 mol/L. However, another reaction is also occurring, forming an undesired product C. (Both reactions are irreversible, 1st order, with kB= 0.5 min-1 and kC = 0.1 min-1)

. Assuming parallel reactions A -> B and A -> C, calculate the reactor volume necessary to achieve

NiO(s)+CO(g)⇌Ni(s)+CO2(g)
Kc=4000.0 at 1500 K

If a mixture of solid nickel(II) oxide and 0.12000 M carbon monoxide is allowed to come to equilibrium at 1500 K, what will be the equilibrium concentration of CO2?

why does double focusing mass analyser provide higher resolution than magnetic sector mass analyser?

calculate the ratio of (M+1)+ to M+ peak height for C4H10NO

Calculate the ratio of (M+2)+ and (M+4)+ to M+ peak height for CHBr3.