CHEMISTRY COMMUNITY

halle young 4A

why is formic acid a stronger acid than acetic acid?

halle young 4A

when the complex is negatively charged, i believe you are to add -ate to the end of then name. In the homework there is a problem where iron is named Ferrate. are there any other atoms that have a name change like this that we need to know?

halle young 4A

when drawing radicals, how to you know what atom the unpaired electron goes on?

halle young 4A

this question is from homework problem 6D.11 decide whether an aqueous solution of each of the following salts has a pH equal to, greater than, or less than 7. If pH > 7 or pH < 7, write a chemical equation to justify your answer. (a) NH4Br (b) Na2CO3 (c) KF (d) KBr (e) AlCl3 (f) Cu(NO3)2. i am havi...

halle young 4A

Lyndon sees his crush and panics, accidentally dropping 382.7 mg of HCl and 147.1 mg CaO into a 1L flask. After filling that last with water up to the 1L mark, what is the pH of the resulting solution? how do we find pH given these values? did we go over this in class or is there a section in the bo...

halle young 4A

what is the difference between amphoteric and amphiprotic?

halle young 4A

how to you write the hybridization and bond types of a triple bond?

for example, how would you write the sigma and pi bonds in C≡N (with a lone pair)

halle young 4A

can someone please explain this

Explain why solutions of weak acids have higher pH values than solutions of strong acids at the
same concentration.

halle young 4A

what is an oxyacid?

halle young 4A

How can you tell if a compound is a lewis acid or a lewis base while looking at its structure. for example, why is SO2 considered a lewis acid?

halle young 4A

but how would you know if the name would be for example: nitro (NO2-) or nitrito (ONO-)

halle young 4A

when naming complexes, how will we know which ligand atom is the binding atom?

halle young 4A

will we be expected to know the formulas for en, dien, and EDTA?

halle young 4A

are there any other atoms that have names other than their regular name like this?

halle young 4A

how would you distinguish a coordination compound from being a tetrahedral shape or a square planar shape if just given a formula?

halle young 4A

when given the formula for a ligand, how will you be able to tell if it is mono/bi/tridentate?

halle young 4A

in homework problem 9C.1 part a, why do we call Fe ferrate instead of iron?

halle young 4A

can some please explain homework problem 2F.15? noting that the bond angle of am 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 increases? specifically what do ...

halle young 4A

what is the shape of NO? is it polar or non polar? does the fact that its a radical affect its shape?

halle young 4A

what will the bond angles be in a square planar molecule? Will they be <90 and <180?

halle young 4A

In the seesaw shaped molecule, will the angles be < 90, 120, and 180? (assuming the lone pair is in the equatorial position)

halle young 4A

Why is interaction potential energy always negative? Also does Ep increase with increasing polarizability and decrease with increasing distance between atoms/molecules?

halle young 4A

In Dr. Lavelle's class do we point the arrow towards the negatively charged dipole? If so wouldn't CO2 be considered a polar molecule because the dipole moments are facing outwards and they don't cancel?

halle young 4A

In how many places can HNO2 have a hydrogen bond?

halle young 4A

How is AsF5 a non polar molecule? How do the dipoles cancel if there is an odd number of F atoms around the As?

halle young 4A

homework problem 2E.13

draw the lewis structure, VSPER formula, molecular shape, and bond angles for each of the following species: (a) I3^-

in part a, since there are lone pairs about the central atom, why is this still considered a linear shape? and why are the angles still predicted to be 180?

halle young 4A

this is an in general question, but I am having trouble determining what dispersion forces are used when and if the molecule is polar or not (can't do the homework problems). Will we learn how to do these after completing sections 2E-F?

halle young 4A

When a lone pair is present in a molecule, how do we know if it will increase or decrease the bond angle? or will either answer be correct?

halle young 4A

How do you know when the overall molecule has a dipole?

halle young 4A

homework problem 3F.1 Identify the types of attractive intermolecular interactions that might arise between molecules of each of the following substances: (a) NH2OH (b) CBr4 (c) H2SeO4 (d) SO2 i understand that London interactions happen for all molecules and i understand when there is a hydrogen bo...

halle young 4A

can someone give a definition for london forces? the definition in my notes is a bit confusing. Also, is van der waals just a term to describe all intermolecular forces?

halle young 4A

can someone give a definition for london forces? the definition in my notes is a bit confusing. Also, is van der waals just a term to describe all intermolecular forces?

halle young 4A

How do you know if a molecule is polar or not so you can state whether it is a dipole-dipole or london dispersion?

halle young 4A

How do you know whether the interaction is a pure dipole moment or a induced dipole-induced dipole moment?

halle young 4A

why does the atomic radius decrease across the periodic table?

halle young 4A

How do you determine the magnetic quantum number of an atom?

halle young 4A

How do we know which element has the slightly positive and which has the slightly negative charge when looking at the dipole moment?

halle young 4A

Can someone please go over what probability means in terms of each orbital? thanks

halle young 4A

for questions that ask us to compare two elements and decide which one is more ionic, will we be given a periodic table with the electronegativity values?

halle young 4A

I was doing problem 2c.5 in the homework and was wondering how you know which element has the unpaired electron? thanks

halle young 4A

this is from homework problem 2B.3

draw the Lewis structure of (a) OF2, (b) NHF2, (c) SiO2, (d) BrF3

in part D, why does Br have 10 electrons?

halle young 4A

Can someone please go over this topic in the outline? I don't really understand what they mean by probability

Describe the interpretation of atomic orbitals in terms of probability

halle young 4A

can someone please explain this concept from the unit 2 study guide With respect to electron transitions that give rise to a UV or visible spectrum: understand the difference between electronic transitions in atomic orbitals (atomic spectroscopy) and electronic transitions in molecular orbitals (mol...

halle young 4A

this is a question from the topic 2 outline
could someone please answer it? I am having trouble getting a clear answer

Name and explain the relationship of each of the four s-, p-, and d-orbitals to the properties of electrons in these states.

halle young 4A

I know we won't have to do calculations with this equation, but conceptually can someone go over what the equation does? I am still a bit confused on what it means.
thanks

halle young 4A

can someone please explain homework problem 2A.9?

which M^2+ ions (where M is a metal) are predicted to have the following ground-state electron configurations: (a) [Ar] 3d7 (b) [Ar] 3d6 (c) [Kr] 4d4 (d) [Kr] 4d3?

Im especially confused how they got the answers they did for part a and b
thanks

halle young 4A

Are there more elements than P, S, and Cl that can have more than 8 valence electrons? He mentioned in lecture that atoms in period 3 or higher have d orbitals in valence shells that accommodate more electrons so I was wondering why those were the only 3 elements mentioned.
thanks

halle young 4A

can someone please explain this problem? i didn't really understand any part of it

2A.11 Which M3+ ions (where M is a metal) are predicted to have the following ground state election configurations: (a) [Ar] 3d6; (b) [Ar] 3d5; (c) [Kr] 4d5; (d) [Kr] 4d3

thanks

halle young 4A

Can someone please explain part A of this homework problem. I seemed to understand all of them but this part

2A.5 Give the ground state electron configuration expected for each of the following ions: (a) Cu+ (b) Bi3+ (c) Ga3+ (d) Tl3+

thank you!

halle young 4A

homework problem 1E.17

For each of the following ground-state atoms, predict the type of orbital (1s, 2p, 3d, 4f, etc.) from which an electron will removed to form the +1 ion: (a) Ge; (b) Mn; (c) Al; (d) Cu.

Can someone please explain part b? I am confused on how the answer is the 4s orbital.
thanks

halle young 4A

In the answer book it says the change in velocity is 5 m/s. however, wouldn't it be 10m/s?

halle young 4A

Can someone please explain more in depth what cations and anions are and how they relate to the ionic radius? I know we touched on this in lecture but I still seem to be a bit confused

thanks

halle young 4A

Can someone please explain what psi^2 means? Also what the equation psi^2 = e-p means?
thanks

halle young 4A

can someone please explain

1B.27 A bowling ball of mass 8.00 kg is rolled down a bowling alley lane at 5.00 +/- 5.0 m/s. what is the minimum uncertainty in its position?

halle young 4A

Can someone please do this homework problem and explain how they got their answers?

1D.11 How many orbitals are in subshells with l equal to (a) 0; (b) 2; (c) 1; (d) 3?

halle young 4A

homework problem 1B.19 protons and neutrons have nearly the same mass. how much different are their wavelengths? calculate the wavelength of each particle when traveling at 2.75 x 10^5 m/s in a particle accelerator and report the difference as a percentage of the wavelength of the neutron. can someo...

halle young 4A

1B.7 sodium vapor lamps, used for public lighting, emit yellow light of wavelength 589 nm. how much energy is emitted by (a) an excited sodium atom when it generates a photon; (b) 5.00 mg of sodium atoms emitting light at this wavelength; (c) 1.00 mol or sodium atoms emitting light at this wavelength?

halle young 4A

Homework Problem 1A. 15

In the ultraviolet spectrum of atomic hydrogen, a line is observed at 102.6 nm. Determine the values of n for the initial and final energy levels of the electron during the emission of energy that leads to this spectral line.

halle young 4A

G.13

To prepare a fertilizer solution, a florist dilutes 1.0 L of 0.20 M NH4NO3 (aq) by adding3.0 L of water. The florist then adds 100. mL of the diluted solution to each plant. How many moles of nitrogen atoms will each plant receive? Solve this exercise without using a calculator.

halle young 4A

Copper (II) nitrate reacts with sodium hydroxide to produce a precipitate of light blue copper (II) hydroxide what is the net ionic equation for the reaction?

what is a net ionic equation?

halle young 4A

M. 19 A stimulant in coffee and tea is caffeine, a substance of molar mass 195 g•mol^-1. When 0.376 g of caffein was burned, 0.682 g of carbon dioxide, 0.174 g of water, 0.110 g of nitrogen were formed. Determine the empirical and molecular formulas of caffeine, and write the equation for its combus...

halle young 4A

Please help with - G.23 in medicine it is sometimes necessary to prepare solutions with a specific concentration of a given ion. A lab technician has make up 100.0 mL of a solution containing 0.50 g NaCl and 0.30 g of KCl, as well as glucose and other sugars. What is the concentration of chloride io...

halle young 4A

can someone please explain this problem? M.5 Solve this exercise without using a calculator. The reaction 6ClO2 (g) + 2BrF3 (l) —> 6ClO2F (s) + Br2 (l) is carried out with 12 mol ClO2 and 5 mol BrF3. (a) Identify the excess reactant. (b) Estimate how many moles of each product will be produced and h...

halle young 4A

(a) Determine the number of KNO3 formula units in 0.750 mol KNO3 (b) what is the mass (in milligrams) of 2.39 x 10^20 formula units of Ag2SO4? (c) Estimate the number of NaHCO2 formula units in 3.429 g of NaHCO2, sodium formate, which is used in dyeing and printing fabrics.

halle young 4A

Could someone do a quick review on how to write chemical equations when given compounds? Or list a few common ones we will be expected to know?

halle young 4A

Can someone please explain... Hydrazine, N2H4, is an oily liquid used as rocket fuel. It can be prepared in water by oxidizing ammonia with hypochlorite ions: 2 NH3(g) + ClO-(aq) --> Cl-(aq) = H20(l). when 35.0 g of ammonia reacted with an excess of hypochlorite ion, 25.2 g of hydrazine was produced...

halle young 4A

Can someone please explain in depth what it means to have an aqueous solution? How would I know when its aqueous rather than liquid?

halle young 4A

Could someone please explain problem E.15?

The molar mass of metal hydroxide M(OH)2 is 74.10 gxmol^-1. What is the molar mass of the sulfide of this metal?

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