CHEMISTRY COMMUNITY

MichelleTran3I

Calculate the pH, pOH, and percentage deprotonation of each of the following aqueous solutions: (a) 0.20 m CH3COOH(aq); (b) 0.20 m CCl3COOH(aq); (c) 0.20 m HCOOH(aq). (d) Explain any differences in pH on the basis of molecular structure. How do you calculate Ka for part a when you are only given 0.2...

MichelleTran3I

A careless laboratory technician wants to prepare 200.0 mL of a 0.025 M HCl(aq) solution, but uses a 250.0-mL volumetric ask by mistake. (a) What would the pH of the desired solution have been? (b) What will be the actual pH of the solution as prepared? For part b, why do we continue to use the mola...

MichelleTran3I

State whether the following oxides are acidic, basic, or amphoteric: (a) BaO; (b) SO3; (c) As2O3; (d) Bi2O3.

Would the only approach to this be drawing the Lewis structures? Thanks!

MichelleTran3I

Why is there no proton transfer in part c) CH3COOH(aq)+ NH3(aq) -> CH3CONH2(aq)+ H2O(l) ? Thanks!

MichelleTran3I

SO4 2- is the conjugate base of HSO4- because, as stated above, the difference is only a single hydrogen. When finding the conjugate base of something, remove a single hydrogen and add a negative charge, hope this helps!

MichelleTran3I

A reactor for the production of ammonia by the Haber process is found to be at equilibrium with PN2 3.11 bar, PH2 1.64 bar, and PNH3 23.72 bar. If the partial pressure of N2 is increased by 1.57 bar, what will be the partial pressure of each gas once equilibrium is re-established? I followed the sol...

MichelleTran3I

a) A sample of 2.0 mmol Cl2(g) was sealed into a 2.0-L reaction vessel and heated to 1000. K to study its dissociation into Cl atoms. Use the information in Table 11.2 to calculate the equilibrium composition of the mixture. (b) If 2.0 mmol F2 was placed into the reaction vessel instead of the chlor...

MichelleTran3I

How can you differentiate between a square planar shape and a tetrahedral shape when looking at Lewis dot structures? Thanks!

MichelleTran3I

Noting that the bond angle of an sp3 hybridized atom
is 109.5 and that of an sp2 hybridized atom is 120 , do you expect the bond angle between two hybrid orbitals to increase or decrease as the s-character of the hybrids is increased?

What do they mean when they say s-character? Thanks!

MichelleTran3I

Why is the shape of (CH3)2Be tetrahedral? With Be as the central atom, there's only two regions of electron density. Can someone please explain how it ends up being a tetrahedral? Thanks!

MichelleTran3I

With respect to equilibrium constants what does it mean when the “equilibrium is shifted to the left”?

Also the module asks two different questions, one with "shifted to the left" and "lies to the left". Is there any difference between the two phrases? Thanks!

MichelleTran3I

How do lone pairs affect the standard bond angles for each shape? If a lone pair does exist, to what extent does it affect the bond angle and is there any way to calculate this?

MichelleTran3I

The oxidation number is the overall charge of the compound. You would add up all the charges of the compound and the sum would be the oxidation number, or the charge of the compound.

MichelleTran3I

Why are s-block metals typically more reactive than p-block metals?

MichelleTran3I

How do you determine the number of unpaired electrons from looking at the ground state configuration? Thanks!

MichelleTran3I

When do you know when to begin the electron configuration with the d orbital instead of the s orbital first?

MichelleTran3I

This does not answer your question regarding the +/- but the solutions manual states 5.0 m/s-1 as delta v, but delta v should actually be 10 m/s-1. It is simply an error and can be found in the Solutions Manual Errors link on the class website. It should clear up any confusion when it comes to deter...

MichelleTran3I

Can someone explain to me why s- electrons have lower energy than p-electrons in the same shell? Thanks!

MichelleTran3I

How do you determine if an electron configuration represents the ground state or the excited state of the atom given?

MichelleTran3I

Infrared spectroscopy is an important tool for studying vibrations of molecules. Just as an atom can absorb a photon of suitable energy to move an electron from one electronic state to another, a molecule can absorb a photon of electromagnetic radiation in the infrared region to move from one vibrat...

MichelleTran3I

What is the minimum uncertainty in the speed of an electron con ned to within a lead atom of diameter 350. pm? Model the atom as a one-dimensional box with a length equal to the diameter of the actual atom. What does this question ask for specifically when it says to model the atom as a one-dimensio...

MichelleTran3I

Did you hear about Oxygen and Magnesiym getting together?
I was like OMg!!!

MichelleTran3I

Argon is tending the bar. Helium walks in.
Neither react.

MichelleTran3I

A chemist measured out 8.61 g of copper(II) chloride tetrahydrate, CuCl2 4H2O. (a) How many moles of CuCl2 4H2O were measured out? (b) How many moles of Cl ions are present in the sample? (c) How many H2O molecules are present in the sample? (d) What fraction of the total mass of the sample was due ...

MichelleTran3I

TA medical researcher investigating the properties of intravenous solutions prepared a solution containing 0.278 m C6H12O6 (glucose). What volume of solution should the researcher use to provide 4.50 mmol C6H12O6? Can someone explain how to begin this problem? I do not know how to approach it withou...

CHEMISTRY COMMUNITY

Search found 25 matches

12.55 a

12.27

12.17

12.9 C

Re: HW 12.3

11.79

11.45

Square planar vs Tetrahedral

4.43

4.19 b

Chemical Equilibrium 1A Post Module 31

Lone Pair Effect on Bond Angles [ENDORSED]

Re: Oxidation Number [ENDORSED]

s-block vs p-block

Unpaired Electrons [ENDORSED]

d orbital or s orbital first?

Re: Exercise 1.45

s- electrons vs p- electrons [ENDORSED]

Ground or Excited State?

Chapter 1 #55

Chapter 1 #43 [ENDORSED]

Re: Post All Chemistry Jokes Here

Re: Post All Chemistry Jokes Here

E29 Fundamentals

G11