Search found 26 matches
- Tue Dec 04, 2018 2:56 am
- Forum: Coordinate Covalent Bonds
- Topic: Difference between coordinate covalent and covalent bond
- Replies: 6
- Views: 10096
Re: Difference between coordinate covalent and covalent bond
Coordinate covalent bonds have one species donate both electrons to the forming the bond while usually covalent bonds have one electron come from each atom.
- Tue Dec 04, 2018 1:12 am
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Heisenberg and Wavelength
- Replies: 11
- Views: 1754
Re: Heisenberg and Wavelength
momentum and wavelength directly affect each other.
- Mon Dec 03, 2018 11:39 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Drawing orbitals
- Replies: 4
- Views: 1676
Re: Drawing orbitals
Draw the shape of the p orbital first and then draw it on the x axis and y axis and the z axis.
- Mon Nov 26, 2018 1:08 am
- Forum: Lewis Acids & Bases
- Topic: Determine Lewis Acid
- Replies: 13
- Views: 1684
Re: Determine Lewis Acid
Lewis acids become negatively charged and accepts electrons.
- Mon Nov 26, 2018 1:03 am
- Forum: Lewis Structures
- Topic: Expanded Octet
- Replies: 8
- Views: 925
Re: Expanded Octet
Expanded octet is when an element can have more than 8 electrons, such as elements in the d-orbital.
- Mon Nov 26, 2018 12:46 am
- Forum: General Rate Laws
- Topic: Unique Reaction Rates [ENDORSED]
- Replies: 45
- Views: 165996
Re: Unique Reaction Rates [ENDORSED]
The unique rate stays constant for all reactants and depends on coefficients of the reaction.
- Fri Nov 16, 2018 1:26 am
- Forum: Octet Exceptions
- Topic: Octet vs formal charge
- Replies: 16
- Views: 3156
Re: Octet vs formal charge
The accuracy of formal charge should be prioritized over having a full octet, because formal charge is usually more guaranteed while octet rule comes with exceptions.
- Fri Nov 16, 2018 1:14 am
- Forum: Electronegativity
- Topic: Electronegativity
- Replies: 8
- Views: 930
Re: Electronegativity
Noble gases have stable configurations, so they don't have electronegativity values.
- Thu Nov 15, 2018 11:47 pm
- Forum: Ionic & Covalent Bonds
- Topic: delta positive delta negative
- Replies: 15
- Views: 2354
Re: delta positive delta negative
Delta negative means the atom accepts electrons and delta positive means the atoms donates electrons.
- Thu Nov 15, 2018 11:41 pm
- Forum: Empirical & Molecular Formulas
- Topic: Going from empirical to Molecular formula
- Replies: 14
- Views: 2242
Re: Going from empirical to Molecular formula
The number should be a whole number, but if it isn't and it's really close you can round it up.
- Thu Nov 15, 2018 11:31 pm
- Forum: Trends in The Periodic Table
- Topic: Atomic Radius
- Replies: 6
- Views: 1042
Re: Atomic Radius
Atomic radius increases down a group because additional shells create a greater distance from the nucleus and decreases across a period as the effective nuclear charges increases.
- Thu Nov 15, 2018 11:12 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: degeneracy of the a 4p orbital
- Replies: 9
- Views: 2184
Re: degeneracy of the a 4p orbital
The answer would be 3 because p has one subshell, which will have 3 orbitals which all share the same energy level.
- Thu Nov 15, 2018 11:05 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: diatomic elements
- Replies: 12
- Views: 10005
Re: diatomic elements
Elements are diatomic because their valence shells aren't completely filled by electrons; therefore, electrons are shared a lower energy state is achieved.
- Thu Nov 15, 2018 10:58 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Double/Triple Bonds
- Replies: 5
- Views: 1018
Re: Double/Triple Bonds
Double and triple bonds don't affect bond angles, but the lone pairs do.
- Thu Nov 15, 2018 10:50 pm
- Forum: Octet Exceptions
- Topic: Radicals
- Replies: 16
- Views: 1769
Re: Radicals
Aim to get formal charge close to 0 and base the placement of your radical on that.
- Thu Nov 15, 2018 10:37 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: Determining the polarizability
- Replies: 4
- Views: 570
Re: Determining the polarizability
You don't have to look at the charge when looking at anions, only consider it when when ions have positive charge.
- Thu Nov 15, 2018 10:31 pm
- Forum: Photoelectric Effect
- Topic: Work Function
- Replies: 14
- Views: 2277
Re: Work Function
Use Ek=hv-work to solve for work functions and use other variables given in the problem to plug in!
- Thu Nov 15, 2018 10:23 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: MOLARITY
- Replies: 17
- Views: 2174
Re: MOLARITY
Molarity is the measure of concentration of a substance in a solution and is used to calculate concentrations, volumes, or moles of a solution, using M(initial)xV(initial) = M(final)xV(final)
- Thu Nov 15, 2018 9:32 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Finding the volume of stock solution to dilute
- Replies: 13
- Views: 1360
Re: Finding the volume of stock solution to dilute
L or mL is fine, just make sure to have matching units all throughout. It wouldn't hurt to change it at the beginning, since molarity is moles/L.
- Thu Nov 15, 2018 9:13 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3937453
Re: Post All Chemistry Jokes Here
H2O is water and H2O2 is hydrogen peroxide. What is H2O4?
Drinking.
Drinking.
- Thu Nov 15, 2018 9:10 pm
- Forum: Properties of Electrons
- Topic: Polar vs Non polar
- Replies: 15
- Views: 4841
Re: Polar vs Non polar
To determine whether or not a molecule is polar or nonpolar, you have to consider the electronegativity between atoms, and if the atoms are symmetrical, it would most likely be nonpolar.
- Thu Nov 15, 2018 10:54 am
- Forum: General Rate Laws
- Topic: Unique Reaction Rates [ENDORSED]
- Replies: 45
- Views: 165996
Re: Unique Reaction Rates [ENDORSED]
Unique rate depends on the stoichiometric coefficient, but stays the same for all products and reactants in the reaction.
- Wed Nov 14, 2018 2:26 am
- Forum: Limiting Reactant Calculations
- Topic: Actual Yield
- Replies: 7
- Views: 1237
Re: Actual Yield
Actual yield is usually given in the problem, but it can be calculated from an experiment.
- Wed Nov 14, 2018 2:00 am
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Net Number Of Moles
- Replies: 5
- Views: 2383
Re: Net Number Of Moles
Taking the number of moles you get after a reaction and subtracting the number of moles from before the combustion should give you the net number of moles.
- Wed Nov 14, 2018 1:39 am
- Forum: SI Units, Unit Conversions
- Topic: Molar Mass to Kg
- Replies: 6
- Views: 17932
Re: Molar Mass to Kg
You'd divide by 6.0221 x 10^23 (Avogadro's Number), and then to convert from grams to kilograms by multiplying 10^3.
- Tue Nov 13, 2018 11:41 pm
- Forum: Significant Figures
- Topic: When to round the answers to significant figures
- Replies: 11
- Views: 2718
Re: When to round the answers to significant figures
Keeping as many significant figures when calculating gets you closest to the correct answer! You can round to the appropriate amount of significant figures at the end.