C

Give some physical evidence to support the claim that Boron tends to form covalent compounds while Aluminum tends to form ionic compounds.

Part of my problem is I am not sure what "physical evidence" this is looking for.

1. Based on what you know about intermolecular forces, would neutral or protonated putrescine have a higher boiling point?

2. What is the molecular geometry/shape about both N atoms in neutral putrescine?

3. What is the molecular geometry/shape about both N atoms in protonated putrescine?

You lift your textbook & drop it onto a desk. Describe the energy transformations (from 1 to another) that occur moving backward in time from a moment after impact.

Which liquid has a lower Vapor Pressure at room temperature, dihexyl ether (C12H26O, BP= 228 degrees C) or methanol (CH3OH, BP=65 degrees C)? Briefly explain your choice.

How many total ions are present in 20.0 mL of a 1.50 M solution of Ca(NO3)2?

I remember that M= moles/Liters & 1 L= 1000 mL so 20.0 mL=0.02 L but I don't know where to go from there...

a) Determine the N--O bond order for each of the following species:

1) NO

2) NO2^1-

3) HNO2

*If I remember correctly Bond Order is something along the lines of # shared/# bonds, but I am not certain and I don't know if I did it correctly.

b) Rank ALL the NO bonds in PART A in order of increasing length.

KMnO4 reacts with hydrochloric acid to give us chlorine gas.

a) If 8.5 g of KMnO4 is mixed with 50 mL of 6.0 M HCl, what is the final pressure of chlorine gas that could be generated if the final temperature is 110 degrees celsius in a 1.5 L flask?

I know the balanced equation is:

2 KMnO4 + 16 HCl -----> 2 MnCl2 + 2 KCl + 5Cl2 (g) + 8H2O

I also think that due to STP the temperature should be in Kelvin for this type of problem, but I am still stuck and my book wasn't helping.

b) How much of the other reagent (the one that is not the limiting reactant) is left over?

THANKS SO MUCH!!!

A 1.000 g sample of solid residue is being analyzed for Barium. The sample is dissolved and Sodium Sulfate is added. The insoluble Barium Sulfate product that is produced is dried, and a total of 54.9 mg of BaSO4 is collected. What is the mass percent of Ba that was present in the ORIGINAL sample (not the BaSO4 product)-- the original solid residue that contained Ba?

If an equal number of moles of a hot material is placed into thermal contact with a cold material, the final equilibrium temperature will be closer to the substance that has the:

a) LOWER molar heat capacity

b) HIGHER molar heat capacity

How many mL of a 0.240 M HCL solution would be required to completely react with one solid tablet of regular-strength Tums, if each tablet contained 500.0 mg of CaCO3 according to the manufacturer?

I thought I needed to start by working to create a balanced equation?

Which of the following molecules has a net dipole movement?

a) XeF4

b) ICl3

c) Ge(CH2CH3)4

d) None of these

MY ANSWER: When I did this question, I came my answer, I got that A had C had no net dipole movement and therefore came up with the fact that choice B had net dipole movement based on lewis structures. Is this correct?

Thanks for your help in advance! Appreciate it!

THANKS FOR YOUR HELP!