Chemistry Answers

Describe the formation of outer orbit complex [Ni(H2O)6]2+ ion using VBT

Urea, a compound formed in the liver, is one of the ways humans excrete nitrogen.

The Lewis structure for urea is

Using hybrid orbitals for carbon, nitrogen, and oxygen, determine which orbitals overlap

to form the various bonds in urea.

A system does 536

536 kJ of work and loses 251

251 kJ of heat to the surroundings.

What is the change in internal energy, Δ𝐸

ΔE, of the system? Note that internal energy is symbolized as Δ𝑈 in some sources.

4. What mass of CuI is present in a 1.2 L saturated solution at 25°C? Ksp = 1.3 x10-12 (5 marks)

5. Will a precipitate form when 125 mL of 4.0 x 10-2 M of CaCl2 is added to 175 mL of 2.9 x 10-2 M of NaOH? Ksp of Ca(OH)2 = 4.8 x 10-6. Show the dissociation equation for the possible precipitate and all formulas. (10 marks)

2. At a certain temperature a saturated solution of BaF2 has a concentration of 4.59 x 10-2 M. What is the Ksp for BaF2 at this temperature? (3 marks)

3. What is the concentration of the ions present in a saturated Cd(OH)2 solution? Ksp = 5.3 x 10-15. (4 marks)

Kbr can dissolve in CCl4?

How many grams are in 5 dm^3 of NH3

which of the following gases at STP would have the greatest volume

Calculate the enthalpy change for the following chemical reaction:

CS2 (l) + 3O2 (g) —> CO2 (g) + 2SO2 (g)

1) C (s) + O2 (g) —> CO2 (g)

ΔH°= -393.5 kJ

2) S (s) + O2 (g) —> SO2 (g)

ΔH°= -296.8 kJ

3) C (s) + 2S (s) —> CS2 (l)

ΔH°= +87.9 kJ

Calculate the standard enthalpy change, ΔH, for the following reaction:

2CH3OH(l) + 3O3(g) —> 2CO2(g) + 2H2O(g)

Given:

CH3OH (l) ΔHf° = -238.7 kJ

CO2 (g) ΔHf° = -393.5 kJ

H2O (l) ΔHf° = -285.8 kJ