Are the following statements true or false?

1. A double bond consists of two pairs of electrons.

2. Side-to-side overlap results in a bond with electron density above and below the bond axis.

3. One sigma bond and one pi bond comprise a double bond.

4. A triple bond consists of one pi bond and two sigma bonds.

5. A pi bond restricts rotation about the sigma bond axis.

6. Bonds formed from atomic p orbitals can be either sigma or pi bonds.

A voltaic cell is constructed that uses the following reaction and operates at 298 K. Zn(s) + Ni2+(aq) Zn2+(aq) + Ni(s) (a)

What is the emf of this cell under standard conditions?______ V

(b) What is the emf of this cell when [Ni2+] = 2.24 M and [Zn2+] = 0.112 M?_____ V

(c) What is the emf of the cell when [Ni2+] = 0.298 M and [Zn2+] = 0.925 M?____ V

The pKb values for the dibasic base B are pKb1 = 2.10 and pKb2 = 7.32. Calculate the pH at each of the following points in the titration of 50.0 mL of a 0.80 M B(aq) with 0.80 M HCl(aq).

(a) before addition of any HCl

(b) after addition of 25.0 mL of HCl

(c) after addition of 50.0 mL of HCl

(d) after addition of 75.0 mL of HCl

(e) after addition of 100.0 mL of HCl

13. Construct energy-level diagrams for both high- and low-spin situations for the d6 electron configuration in (a) an octahedral field; (b) a tetrahedral field.

Please explain if possible...I do understand the orbital principle generally. Thank you.

Which method, UPS or XPS, is better for resolving chemical shifts and why? Which direction would a peak in a given spectrum move if an atom loses a valence charge? What if the atom gains a valence charge? Does the kinetic energy of the photoelectron depend on the X-ray or UV beam energy?

Classify each statement as applying to osmosis, dialysis, or both osmosis and dialysis. Be sure to place all statements. Note: If any part of this question is answered incorrectly, a single red X will appear indicating that one or more of the phrases has been placed incorrectly.

-involves the movement of water across a semipermeable membrane

-may be used as a way to seperate small molecules and ions from colloids

-involves the movement of small particles across a semipermeable membrane

-involves the movement of water across a cell membrane.

-can be used medically in artificial kidney machines to remove urea.

For the reaction shown, compute the theoretical yield of the product (in grams) for each of the following initial amounts of reactants.
Ti(s)+2F2(g)→TiF4(s)

1)7.0 g Ti , 7.0 g F2

Express your answer using two significant figures.

m= ______ g

2) 2.3 g Ti , 1.5 g F2

Express your answer using two significant figures.

m=_______ g

3) 0.236 g Ti , 0.292 g F2

M =_____ g

A 2.32 g sample of a substance suspected of being pure gold is warmed to 71.9 ∘C and submerged into 15.9 g of water initially at 24.9 ∘C. The final temperature of the mixture is 26.7 ∘C.

What is the heat capacity of the unknown substance?

Consider the following balanced equation Ca₃(PO₄)₂ (s) + 3H₂SO₄ (aq) -------> 3CaSO₄ (s) + 2H₃PO₄ (aq)

What masses of calcium sulfate and phosphoric acid can be produced from the reaction of 1.0 kg calcium phosphate with 1.0 kg concentrated sulfuric acid (98% H₂SO₄ by mass)?

A 2.43 g lead weight, initially at 10.6 ∘C, is submerged in 7.78 g of water at 52.9 ∘C in an insulated container. What is the final temperature of both the weight and the water at thermal equilibrium?

1. Which of the following slightly soluble substances are more soluble in acidic solution: AgCl AgCN CaF2? Explain why.

2. 50.0 ml of a solution containing 0.010M Pb(NO3)2 is mixed with 50.0 ml of a solution containing 0.10 M NaCl. What will the concentrations of Pb++ and of Cl– be after the mixing? PbCl2 has a Ksp = 1.7 x 10-5 . What is the value of Q for the lead and chloride ions? Will a precipitate form in the mixture? Why or why not.

When you titrate 17.2 mL of a 0.14 M solution of (CH₃)₃N (trimethylamine), it required 17.0 mL of hydrochloric acid solution. Assuming that you have reached the equivalence point, what is the pH of the resulting solution?

The titration of weak diprotic acid H₂A with strong base is conducted. What is the pH of the solution at the following volumes, 0,10,25,50,60,75,100,125,and 150mL if K^_a1=1.0x10^-4 and K_a²=3.5x10^-4 and the concentrations for both HA^- and OH^- are 0.1M?

A 62.0 mL sample of a 0.122 M potassium sulfate solution is mixed with 36.5 mL of a 0.108 M lead(II) acetate solution and the following precipitation reaction occurs: K2SO4(aq)+Pb(C2H3O2)2(aq)→2KC2H3O2(aq)+PbSO4(s) The solid PbSO4 is collected, dried, and found to have a mass of 0.992 g . Determine the limiting reactant, the theoretical yield, and the percent yield.