Search found 50 matches
- Sat Dec 07, 2019 5:41 pm
- Forum: Naming
- Topic: bis-,tris-,tetrakis-
- Replies: 2
- Views: 48
bis-,tris-,tetrakis-
When do we use the prefixes bis-, tris-, tetrakis- instead of bi-, tri-, tetra and why?
- Sat Dec 07, 2019 5:40 pm
- Forum: Biological Examples
- Topic: Porphyrin
- Replies: 1
- Views: 55
Porphyrin
What does porphyrin mean?
- Sat Dec 07, 2019 5:39 pm
- Forum: Biological Examples
- Topic: Hemoglobin
- Replies: 4
- Views: 133
Hemoglobin
How is hemoglobin made?
- Sat Dec 07, 2019 5:35 pm
- Forum: Amphoteric Compounds
- Topic: Amphoteric vs Amphiprotic
- Replies: 13
- Views: 519
Amphoteric vs Amphiprotic
What is the difference between an amphoteric and amphiprotic molecule?
- Sat Dec 07, 2019 5:31 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: Nonmetal oxides
- Replies: 2
- Views: 126
Nonmetal oxides
Why do nonmetal oxides not dissociate in the presence of water?
- Sun Dec 01, 2019 2:39 am
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Acid Strength
- Replies: 3
- Views: 76
Acid Strength
Why does increasing the number of oxygen atoms make the acid stronger?
- Sun Dec 01, 2019 2:36 am
- Forum: Biological Examples
- Topic: Cisplatin vs Transplatin
- Replies: 2
- Views: 70
Cisplatin vs Transplatin
Why is cisplatin used to treat cancer but not transplatin?
- Sun Dec 01, 2019 2:35 am
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Shape
- Replies: 1
- Views: 46
Shape
What is the shape of a coordination compound that has 3 ligands?
- Sun Dec 01, 2019 2:34 am
- Forum: Conjugate Acids & Bases
- Topic: Strength of Conjugate Acids and Bases
- Replies: 3
- Views: 84
Strength of Conjugate Acids and Bases
Why are conjugate bases of strong acids weak?
- Sun Dec 01, 2019 2:33 am
- Forum: Lewis Acids & Bases
- Topic: Lewis vs Bronsted
- Replies: 4
- Views: 75
Lewis vs Bronsted
Is it possible for an element or molecule to be a Lewis acid or base but not a Bronsted acid or base?
- Sat Nov 23, 2019 10:35 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Acids
- Replies: 13
- Views: 291
Acids
What acids are we expected to know?
- Sat Nov 23, 2019 10:34 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Ligand
- Replies: 3
- Views: 64
Ligand
What is a ligand?
- Sat Nov 23, 2019 10:33 pm
- Forum: Biological Examples
- Topic: Biological Importance
- Replies: 6
- Views: 91
Biological Importance
What elements/molecules are we expected to know the biological importance/function of?
- Sat Nov 23, 2019 10:32 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Oxidation Number
- Replies: 3
- Views: 59
Oxidation Number
How do we determine oxidation number?
Prefixes
When do we use the prefixes, bis, tris, tetrakis, pentakis?
- Thu Nov 14, 2019 11:04 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Electrons
- Replies: 9
- Views: 166
Electrons
How does spreading electrons further apart make the molecule more stable?
- Thu Nov 14, 2019 10:58 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Repulsion
- Replies: 1
- Views: 47
Repulsion
Why do lone pairs have more repulsion power than bond pairs?
- Thu Nov 14, 2019 10:56 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Arrangement vs Shape
- Replies: 3
- Views: 34
Arrangement vs Shape
What is the difference between the arrangement and shape of a molecule?
- Thu Nov 14, 2019 10:56 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR Formula
- Replies: 3
- Views: 81
VSEPR Formula
How do you determine VSEPR formula?
- Thu Nov 14, 2019 10:55 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angle
- Replies: 9
- Views: 113
Bond Angle
Why is the bond angle of a trigonal pyramidal a little less than 109.5 degrees instead of being exactly 109.5 degrees?
- Thu Nov 07, 2019 1:09 pm
- Forum: Coordinate Covalent Bonds
- Topic: Elements that can form coordinate covalent bonds
- Replies: 2
- Views: 81
Elements that can form coordinate covalent bonds
Are there elements that are more likely to provide the two electrons for a coordinate covalent bond? If so, why?
- Thu Nov 07, 2019 1:01 pm
- Forum: Bond Lengths & Energies
- Topic: Bond lengths in resonance structures
- Replies: 2
- Views: 58
Bond lengths in resonance structures
How do we determine the bond length in resonance structures? Is it just the average of all the bond lengths?
- Thu Nov 07, 2019 1:00 pm
- Forum: Bond Lengths & Energies
- Topic: Bond Length differences
- Replies: 2
- Views: 43
Bond Length differences
Why is a double bond not half the length of a single bond?
- Thu Nov 07, 2019 12:58 pm
- Forum: Dipole Moments
- Topic: Induced Dipole
- Replies: 4
- Views: 74
Induced Dipole
How is a dipole induced?
- Thu Nov 07, 2019 12:51 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Polarizability of Anions
- Replies: 3
- Views: 45
Polarizability of Anions
Are more negatively charged anions more polarizable or are less negatively charged anions more polarizable why?
- Sun Nov 03, 2019 10:07 am
- Forum: Bond Lengths & Energies
- Topic: Bond Strength
- Replies: 6
- Views: 89
Bond Strength
Why are shorter bond lengths stronger?
- Sun Nov 03, 2019 10:06 am
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal Charge Stability
- Replies: 3
- Views: 93
Formal Charge Stability
Why are molecules with lower formal charge more stable?
- Sun Nov 03, 2019 10:02 am
- Forum: Electronegativity
- Topic: electronegativity trend
- Replies: 9
- Views: 138
electronegativity trend
Why does electronegativity decrease going down the column?
- Sun Nov 03, 2019 10:01 am
- Forum: Dipole Moments
- Topic: Significance
- Replies: 2
- Views: 34
Significance
What is the significance of dipole moments in chemistry?
- Sun Nov 03, 2019 9:59 am
- Forum: Octet Exceptions
- Topic: Octet Exceptions
- Replies: 1
- Views: 45
Octet Exceptions
How can some elements accommodate more than 8 valence electrons but others can't?
- Wed Oct 23, 2019 9:27 pm
- Forum: Ionic & Covalent Bonds
- Topic: lewis structures for diff bonds
- Replies: 5
- Views: 95
Re: lewis structures for diff bonds
Yes, we still draw lewis structures for both ionic and covalent bonds. In class potassium chloride was drawn as K+ [ Cl ]-. The Cl has 8 electrons surrounding it.
- Wed Oct 23, 2019 9:24 pm
- Forum: Resonance Structures
- Topic: defintion
- Replies: 7
- Views: 121
Re: defintion
Yes, it is when some lewis structures have multiple bonds in different equivalent locations.
- Wed Oct 23, 2019 9:22 pm
- Forum: Ionic & Covalent Bonds
- Topic: Octet Rule
- Replies: 6
- Views: 85
Octet Rule
Why are H, He, Li, and Be exceptions to the octet rule?
- Wed Oct 23, 2019 9:20 pm
- Forum: Ionic & Covalent Bonds
- Topic: Double Bond vs Single Bond Length
- Replies: 6
- Views: 231
Double Bond vs Single Bond Length
Are double bonds shorter than single bonds because they're stronger? If so, then why is the observed N-O bond length in the NO3- 1.24 A.
- Wed Oct 23, 2019 9:16 pm
- Forum: Ionic & Covalent Bonds
- Topic: Resonance
- Replies: 12
- Views: 228
Resonance
Why are compounds with resonance considered more stable?
- Sun Oct 20, 2019 3:15 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Opposite Spin
- Replies: 5
- Views: 91
Opposite Spin
Why do electrons in an orbital have opposite spins?
- Sun Oct 20, 2019 3:12 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Electron Configuration Exceptions
- Replies: 5
- Views: 84
Electron Configuration Exceptions
What are the exceptions to electron configuration, and why do those exceptions exist?
- Sun Oct 20, 2019 3:11 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Nodal Plane
- Replies: 3
- Views: 43
Nodal Plane
What is the purpose of a nodal plane and why does s- orbitals not have it but others do?
- Sun Oct 20, 2019 3:10 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Quantum Numbers
- Replies: 2
- Views: 57
Quantum Numbers
When does ms equal +1/2 and when does it equal -1/2
- Sun Oct 20, 2019 3:07 pm
- Forum: Photoelectric Effect
- Topic: Photoelectric Effect
- Replies: 7
- Views: 111
Photoelectric Effect
Can someone explain why increasing the intensity of light does not help eject an electron again?
- Sat Oct 12, 2019 12:21 am
- Forum: Properties of Electrons
- Topic: Wave properties
- Replies: 5
- Views: 73
Re: Wave properties
All matter has wavelike properties, but only moving objects with extremely small mass such as electrons can be thoroughly observed/detected.
- Sat Oct 12, 2019 12:13 am
- Forum: Quantum Numbers and The H-Atom
- Topic: Help with 1A. 11
- Replies: 1
- Views: 27
Re: Help with 1A. 11
The quantum number for the lower energy level is the same for every absorption line in each series. For example, the Lyman series has a lower energy level of n=1 for all of the absorption lines.
- Sat Oct 12, 2019 12:04 am
- Forum: Einstein Equation
- Topic: Cancelling out units
- Replies: 2
- Views: 70
Re: Cancelling out units
The units of h, which is Planck's Constant is Js. Joules=kgm^2s^-2. Mass is in the units of kilogram, and velocity has units of m/s. Therefore you have [(kgm^2s^-2)(s)] / [(kg)(m/s)]. The kilograms cancel out: [( kg m^2s^-2)(s)] / [( kg )(m/s)]. The seconds cancel out: [( kg m^2 s^-2 )( s )] / [( kg...
- Fri Oct 11, 2019 11:51 pm
- Forum: Properties of Light
- Topic: Homework question 1E.5?
- Replies: 1
- Views: 71
Re: Homework question 1E.5?
a) False because electrons in lower energy levels/orbitals shield electrons in higher ones due to electron repulsion. Thus, electrons in higher orbital levels experience less attraction to the nucleus. b) True c) False because electrons attraction to the nucleus decrease as l increases, decreasing t...
- Fri Oct 11, 2019 11:39 pm
- Forum: Properties of Light
- Topic: Question 1B7
- Replies: 1
- Views: 24
Re: Question 1B7
a) Using the equation c=vλ, we can replace v in the equation E=hv with c/λ. E=hc/λ=(6.626x10^-34)(2.997x10^8)/(589x10^-9)=3.37X10^-19J b) For this problem I used dimensional analysis: 5.00x10^-3 g Na (1 mol Na/22.99g Na ) ( 6.022x10^23 atoms/1 mol Na)( 3.37x10^-19 J/ 1 atom)= 44.1 J c) Dimensional a...
- Fri Oct 04, 2019 8:26 pm
- Forum: SI Units, Unit Conversions
- Topic: Rounding
- Replies: 6
- Views: 119
Re: Rounding
There is no need to directly indicate it. Just write as many digits as you consider necessary. I usually do two or three digits more than the sig figs for the final answer.
- Fri Oct 04, 2019 8:23 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: G23
- Replies: 2
- Views: 87
G23
In medicine it is sometimes necessary to prepare solutions with a specific concentration of a given ion. A lab technician has made up 100.0 mL of a solution containing 0.50 g of NaCl and 0.30 g of KCl, as well as glucose and other sugars. What is the concentration of chloride ions in the solution? D...
- Fri Oct 04, 2019 8:11 pm
- Forum: Significant Figures
- Topic: Sig Figs
- Replies: 3
- Views: 50
Sig Figs
If there is both multiplication/division and addition/subtraction in a problem, how do we determine the sig figs for the final answer?
- Fri Oct 04, 2019 8:09 pm
- Forum: Balancing Chemical Reactions
- Topic: Question on H15
- Replies: 3
- Views: 101
Re: Question on H15
A molecule is aqueous if it can be dissolved in water.
- Fri Oct 04, 2019 8:03 pm
- Forum: Balancing Chemical Reactions
- Topic: M9
- Replies: 2
- Views: 78
M9
Can someone refresh me on how to write ionic equations?