## Search found 68 matches

Sat Dec 07, 2019 9:55 am
Forum: Lewis Acids & Bases
Topic: formic acid
Replies: 1
Views: 59

### formic acid

why is formic acid a stronger acid than acetic acid?
Fri Dec 06, 2019 11:09 am
Forum: Naming
Replies: 2
Views: 37

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?
Thu Dec 05, 2019 10:26 am
Forum: Octet Exceptions
Replies: 3
Views: 142

when drawing radicals, how to you know what atom the unpaired electron goes on?
Wed Dec 04, 2019 8:38 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: deciding pH
Replies: 1
Views: 41

### deciding pH

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...
Wed Dec 04, 2019 3:57 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Marshmallow Packet pH
Replies: 3
Views: 197

### Marshmallow Packet pH

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...
Wed Dec 04, 2019 3:45 pm
Forum: Polyprotic Acids & Bases
Topic: amphoteric
Replies: 5
Views: 151

### amphoteric

what is the difference between amphoteric and amphiprotic?
Tue Dec 03, 2019 9:23 pm
Forum: Hybridization
Topic: writing hybridization
Replies: 3
Views: 81

### writing hybridization

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)
Mon Dec 02, 2019 8:23 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Outline topic
Replies: 2
Views: 64

### Outline topic

can someone please explain this

Explain why solutions of weak acids have higher pH values than solutions of strong acids at the
same concentration.
Mon Dec 02, 2019 7:53 pm
Forum: Bronsted Acids & Bases
Topic: Oxoacids
Replies: 2
Views: 56

### Oxoacids

what is an oxyacid?
Fri Nov 29, 2019 11:03 am
Forum: Identifying Acidic & Basic Salts
Topic: identifying acids and bases
Replies: 4
Views: 108

### identifying acids and bases

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?
Mon Nov 25, 2019 8:47 pm
Forum: Naming
Topic: naming complexes
Replies: 3
Views: 46

### Re: naming complexes

but how would you know if the name would be for example: nitro (NO2-) or nitrito (ONO-)
Mon Nov 25, 2019 8:43 pm
Forum: Naming
Topic: naming complexes
Replies: 3
Views: 46

### naming complexes

when naming complexes, how will we know which ligand atom is the binding atom?
Mon Nov 25, 2019 8:42 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: complexes
Replies: 3
Views: 100

### complexes

will we be expected to know the formulas for en, dien, and EDTA?
Mon Nov 25, 2019 8:29 pm
Forum: Naming
Topic: naming complexes
Replies: 2
Views: 47

### Re: naming complexes

are there any other atoms that have names other than their regular name like this?
Mon Nov 25, 2019 8:28 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: shape
Replies: 3
Views: 46

### shape

how would you distinguish a coordination compound from being a tetrahedral shape or a square planar shape if just given a formula?
Mon Nov 25, 2019 4:35 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligands
Replies: 3
Views: 52

### Ligands

when given the formula for a ligand, how will you be able to tell if it is mono/bi/tridentate?
Mon Nov 25, 2019 4:30 pm
Forum: Naming
Topic: naming complexes
Replies: 2
Views: 47

### naming complexes

in homework problem 9C.1 part a, why do we call Fe ferrate instead of iron?
Mon Nov 25, 2019 4:06 pm
Forum: Hybridization
Topic: Bond angle/s character
Replies: 3
Views: 48

### Bond angle/s character

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 ...
Tue Nov 19, 2019 5:10 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Nitric Oxide
Replies: 5
Views: 54

### Nitric Oxide

what is the shape of NO? is it polar or non polar? does the fact that its a radical affect its shape?
Tue Nov 19, 2019 12:16 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Square Planar Shape
Replies: 2
Views: 49

### Square Planar Shape

what will the bond angles be in a square planar molecule? Will they be <90 and <180?
Tue Nov 19, 2019 12:14 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Seesaw shape
Replies: 1
Views: 41

### Seesaw shape

In the seesaw shaped molecule, will the angles be < 90, 120, and 180? (assuming the lone pair is in the equatorial position)
Tue Nov 19, 2019 11:57 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: interaction potential energy
Replies: 2
Views: 51

### interaction potential energy

Why is interaction potential energy always negative? Also does Ep increase with increasing polarizability and decrease with increasing distance between atoms/molecules?
Mon Nov 18, 2019 8:52 pm
Forum: Dipole Moments
Topic: Dipole moments
Replies: 3
Views: 75

### Dipole moments

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?
Mon Nov 18, 2019 4:48 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Hydrogen Bond
Replies: 2
Views: 30

### Hydrogen Bond

In how many places can HNO2 have a hydrogen bond?
Mon Nov 18, 2019 3:49 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar/Nonpolar
Replies: 1
Views: 39

### Polar/Nonpolar

How is AsF5 a non polar molecule? How do the dipoles cancel if there is an odd number of F atoms around the As?
Sun Nov 17, 2019 2:58 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: writing VSPER formulas
Replies: 2
Views: 32

### writing VSPER formulas

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?
Wed Nov 13, 2019 9:25 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: intermolecular forces problem
Replies: 1
Views: 39

### intermolecular forces problem

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?
Wed Nov 13, 2019 9:24 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs
Replies: 5
Views: 56

### Lone Pairs

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?
Wed Nov 13, 2019 11:28 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: intermolecular forces
Replies: 8
Views: 170

### Re: intermolecular forces

How do you know when the overall molecule has a dipole?
Wed Nov 13, 2019 11:17 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: intermolecular forces
Replies: 8
Views: 170

### intermolecular forces

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...
Wed Nov 13, 2019 11:15 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Intermolecular forces
Replies: 10
Views: 166

### Intermolecular forces

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?
Wed Nov 13, 2019 11:11 am
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: Intermolecular forces
Replies: 1
Views: 35

### Intermolecular forces

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?
Fri Nov 08, 2019 8:23 pm
Forum: Dipole Moments
Topic: Polar
Replies: 9
Views: 165

### Polar

How do you know if a molecule is polar or not so you can state whether it is a dipole-dipole or london dispersion?
Fri Nov 08, 2019 7:35 pm
Forum: Dipole Moments
Topic: Dipole moments
Replies: 2
Views: 32

### Dipole moments

How do you know whether the interaction is a pure dipole moment or a induced dipole-induced dipole moment?
Fri Nov 08, 2019 7:32 pm
Forum: Trends in The Periodic Table
Replies: 7
Views: 161

why does the atomic radius decrease across the periodic table?
Fri Nov 08, 2019 7:30 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Magnetic Quantum numbers
Replies: 13
Views: 338

### Magnetic Quantum numbers

How do you determine the magnetic quantum number of an atom?
Tue Nov 05, 2019 6:01 pm
Forum: Dipole Moments
Topic: Dipole moments
Replies: 1
Views: 34

### Dipole moments

How do we know which element has the slightly positive and which has the slightly negative charge when looking at the dipole moment?
Tue Nov 05, 2019 5:37 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Probability
Replies: 3
Views: 139

### Probability

Can someone please go over what probability means in terms of each orbital? thanks
Sat Nov 02, 2019 7:46 pm
Forum: Electronegativity
Topic: electronegativity
Replies: 3
Views: 58

### electronegativity

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?
Sat Nov 02, 2019 6:03 pm
Forum: Octet Exceptions
Topic: Lewis structures of Radicals
Replies: 1
Views: 34

### Lewis structures of Radicals

I was doing problem 2c.5 in the homework and was wondering how you know which element has the unpaired electron? thanks
Sat Nov 02, 2019 4:38 pm
Forum: Lewis Structures
Topic: drawing lewis structures
Replies: 5
Views: 84

### drawing lewis structures

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?
Sat Nov 02, 2019 2:47 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Probabilty
Replies: 1
Views: 48

### Probabilty

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
Thu Oct 31, 2019 4:15 pm
Forum: Properties of Light
Topic: atomic/molecular spectroscopy
Replies: 1
Views: 42

### atomic/molecular spectroscopy

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...
Thu Oct 31, 2019 3:09 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: properties of electrons in orbitals
Replies: 1
Views: 65

### properties of electrons in orbitals

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.
Thu Oct 31, 2019 3:05 pm
Forum: *Shrodinger Equation
Topic: shrodinger equation
Replies: 4
Views: 88

### shrodinger equation

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
Wed Oct 30, 2019 4:18 pm
Forum: Ionic & Covalent Bonds
Topic: ground state electron configuration
Replies: 1
Views: 31

### ground state electron configuration

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
Sun Oct 27, 2019 3:23 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Expanded Valence Shells
Replies: 1
Views: 55

### Expanded Valence Shells

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
Wed Oct 23, 2019 10:39 pm
Forum: Ionic & Covalent Bonds
Topic: ground state electron configurations
Replies: 3
Views: 82

### ground state electron configurations

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
Wed Oct 23, 2019 9:46 pm
Forum: Ionic & Covalent Bonds
Topic: ground state electron configuration
Replies: 3
Views: 97

### ground state electron configuration

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!
Tue Oct 22, 2019 10:19 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: predicting the type of orbital
Replies: 2
Views: 53

### predicting the type of orbital

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
Tue Oct 22, 2019 9:41 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: uncertainty in position
Replies: 4
Views: 70

### Re: uncertainty in position

In the answer book it says the change in velocity is 5 m/s. however, wouldn't it be 10m/s?
Tue Oct 22, 2019 9:15 pm
Forum: *Particle in a Box
Topic: cations and anions
Replies: 5
Views: 208

### cations and anions

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
Fri Oct 18, 2019 11:35 am
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbitals and Probability
Replies: 2
Views: 44

### Orbitals and Probability

Can someone please explain what psi^2 means? Also what the equation psi^2 = e-p means?
thanks
Thu Oct 17, 2019 11:08 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: uncertainty in position
Replies: 4
Views: 70

### uncertainty in position

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?
Wed Oct 16, 2019 10:32 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbitals
Replies: 4
Views: 92

### Orbitals

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?
Tue Oct 15, 2019 8:38 pm
Forum: DeBroglie Equation
Topic: Calculating Wavelength
Replies: 5
Views: 133

### Calculating Wavelength

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...
Mon Oct 14, 2019 11:20 am
Forum: Einstein Equation
Topic: Energy Emitted
Replies: 2
Views: 115

### Energy Emitted

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?
Wed Oct 09, 2019 4:41 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Spectrum of Atomic Hydrogen
Replies: 3
Views: 64

### Spectrum of Atomic Hydrogen

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.
Mon Oct 07, 2019 8:21 pm
Forum: Molarity, Solutions, Dilutions
Topic: Dilution Calculatons
Replies: 2
Views: 87

### Dilution Calculatons

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.
Sun Oct 06, 2019 4:33 pm
Forum: Limiting Reactant Calculations
Topic: Net Ionic Equation
Replies: 6
Views: 135

### Net Ionic Equation

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?
Fri Oct 04, 2019 9:35 pm
Forum: Empirical & Molecular Formulas
Topic: Empirical and Molecular Formulas
Replies: 2
Views: 84

### Empirical and Molecular Formulas

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...
Wed Oct 02, 2019 7:12 pm
Forum: Molarity, Solutions, Dilutions
Topic: Dilution Calculations
Replies: 3
Views: 80

### Dilution Calculations

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...
Wed Oct 02, 2019 5:04 pm
Forum: Limiting Reactant Calculations
Topic: Limiting Reactant
Replies: 2
Views: 70

### Limiting Reactant

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...
Tue Oct 01, 2019 9:26 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Formula Units
Replies: 3
Views: 93

### Formula Units

(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.
Tue Oct 01, 2019 2:43 pm
Forum: SI Units, Unit Conversions
Topic: Writing chemical equations
Replies: 2
Views: 116

### Writing chemical equations

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?
Mon Sep 30, 2019 9:35 pm
Forum: Empirical & Molecular Formulas
Topic: Percentage Yield
Replies: 3
Views: 55

### Percentage Yield

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...
Mon Sep 30, 2019 3:52 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Aqueous Solution
Replies: 6
Views: 93

### Aqueous Solution

Can someone please explain in depth what it means to have an aqueous solution? How would I know when its aqueous rather than liquid?
Sat Sep 28, 2019 10:25 am
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Molar Mass
Replies: 2
Views: 119

### Molar Mass

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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