Search found 29 matches
- Mon Jun 11, 2018 12:03 am
- Forum: Hybridization
- Topic: Hybrid Orbitals
- Replies: 5
- Views: 666
Re: Hybrid Orbitals
My TA said up to 4 regions which would be sp3
- Sun Jun 10, 2018 11:59 pm
- Forum: Significant Figures
- Topic: Sig fifs in 750 [ENDORSED]
- Replies: 6
- Views: 1336
Re: Sig fifs in 750 [ENDORSED]
A super easy way of counting sig figs is a quick trick I was taught in High School Chem. The Pacific and the Atlantic. You orient both oceans as if looking on a map. Then if a decimal is (P)resent then you start on the left side of the number and start counting with the first number larger than zero...
- Sun Jun 10, 2018 11:53 pm
- Forum: Electronegativity
- Topic: electronegativity chart
- Replies: 11
- Views: 1788
Re: electronegativity chart
It is definitely not necessary to memorize these numbers. It is more important to know the trends of electronegativity. A trick I use for memorizing trends is to know the element with the highest electronegativity and a line pointing in that direction is the general trend.
- Sun Jun 03, 2018 11:58 pm
- Forum: Coordinate Covalent Bonds
- Topic: transition metals
- Replies: 3
- Views: 1119
Re: transition metals
It gets a little foggy in the transition metals unlike the rest of the elements. You can learn information by looking at the element that it is bonded to and how many there are of that element in relation to the transition metal.
- Sun Jun 03, 2018 11:54 pm
- Forum: Electronegativity
- Topic: Electroegativity
- Replies: 9
- Views: 1250
Re: Electroegativity
You cannot know unless given actual information about the element or using the periodic trend.
- Sun Jun 03, 2018 11:53 pm
- Forum: Ideal Gases
- Topic: Chemical equilibrium [ENDORSED]
- Replies: 9
- Views: 1809
Re: Chemical equilibrium [ENDORSED]
The reaction can only be favored in the reverse reaction if something were to happen to the equation. For example if products or reactants were taken away or increased.
- Sun Jun 03, 2018 11:49 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: F orbital
- Replies: 6
- Views: 940
Re: F orbital
There are 7 orbitals. In these 7 orbitals, 14 electrons can occupy these orbitals because 2 can fit in each.
- Sun Jun 03, 2018 11:47 pm
- Forum: Properties of Light
- Topic: Wave and Particle
- Replies: 10
- Views: 1208
Re: Wave and Particle
Light is made up of photons (photons of light) and these photons move in waves.
- Sun Jun 03, 2018 11:44 pm
- Forum: *Making Buffers & Calculating Buffer pH (Henderson-Hasselbalch Equation)
- Topic: When to use the Henderson-Hasselbalch Equation
- Replies: 4
- Views: 2930
Re: When to use the Henderson-Hasselbalch Equation
This equation is used for estimating the pH of a buffer solution.
- Sun Jun 03, 2018 11:39 pm
- Forum: Sigma & Pi Bonds
- Topic: Difference between Bonds [ENDORSED]
- Replies: 7
- Views: 1130
Re: Difference between Bonds [ENDORSED]
Sigma is always the first bond and then followed by pi bonds. For example, a triple bond is made up of a sigma bond and 2 pi bonds.
- Sun Jun 03, 2018 11:34 pm
- Forum: Hybridization
- Topic: basics of hybridization
- Replies: 18
- Views: 2411
Re: basics of hybridization
1. Draw the lewis structure of an atom. 2. Count the number of lone pairs. 3. Count the number of bond (a double bond and a triple bond count as 1 bond in this case). 4. Add up #2 and #3 and that gives you a number. 5. The number found in #4 corresponds to hybridization. For example, 2=SP, 3=SP^2, 4...
- Sun Jun 03, 2018 11:25 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: ICE table question
- Replies: 5
- Views: 11768
Re: ICE table question
Based on the given information, whether the products are increasing or decreasing, you should be able to deduce whether x is + or -.
- Sun May 27, 2018 7:30 pm
- Forum: Bond Lengths & Energies
- Topic: Bond Strength
- Replies: 5
- Views: 795
Re: Bond Strength
The shorter the bond, the stronger it is. Triple bonds are the shortest and single bonds are the longest.
- Sun May 27, 2018 7:29 pm
- Forum: Octet Exceptions
- Topic: Octet Exception
- Replies: 7
- Views: 1084
Re: Octet Exception
The exceptions are H, He, Li, Be, S, and F
- Sun May 27, 2018 7:28 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: formal charge
- Replies: 11
- Views: 1603
Re: formal charge
It is a lot easier to calculate formal charge as
FC= (The # of valence electrons the element comes with) - (The number of bonds/dots the electron has now)
FC= (The # of valence electrons the element comes with) - (The number of bonds/dots the electron has now)
- Sun May 27, 2018 7:26 pm
- Forum: Ionic & Covalent Bonds
- Topic: ionic and covalent character
- Replies: 7
- Views: 3065
Re: ionic and covalent character
As electronegativity increases, does ionic or covalent character increase? What is the reasoning for this?
- Sun May 20, 2018 11:45 pm
- Forum: Ionic & Covalent Bonds
- Topic: Octet rule
- Replies: 17
- Views: 2346
Re: Octet rule
The octet rule is when atoms are most stable with a full set of electrons (8). There are many exceptions to this rule that simply just need to be memorized. Therefore, when drawing lewis dot diagrams most times, each element needs to find it's most stable state with 8 electrons each, either shared o...
- Sun May 20, 2018 11:42 pm
- Forum: Ionic & Covalent Bonds
- Topic: Properties of Hydrogen
- Replies: 3
- Views: 420
Re: Properties of Hydrogen
Because Hydrogen forms bonds with non metals does it therefore only form covalent bonds?
- Sun May 20, 2018 11:39 pm
- Forum: Ideal Gases
- Topic: PV=nRT
- Replies: 3
- Views: 645
PV=nRT
Hypothetically, when using PV=nRT, can you use it along with MV=MV? I know that sometimes you cannot use certain equations given their circumstances.
- Sun May 06, 2018 11:37 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Mass percentage
- Replies: 8
- Views: 988
Re: Mass percentage
The mass percentages have to equal 100% because all the elements together must add up to the total molecule. However, you may be confused for the next step in solving an empirical formula problem, when we are asked to assume that the elements are part of a 100 gram sample. This simply just makes the...
- Sun May 06, 2018 11:34 pm
- Forum: *Shrodinger Equation
- Topic: Schrodinger's Equation & Orbitals
- Replies: 3
- Views: 569
Re: Schrodinger's Equation & Orbitals
I am also confused about this equation. Do you think we will have to explain it conceptually/ can anyone explain the use of the equation?
- Sun May 06, 2018 11:23 pm
- Forum: Balancing Chemical Reactions
- Topic: balancing chemical reactions
- Replies: 7
- Views: 2502
Re: balancing chemical reactions
Does anyone know an easier way to balance chemical equations? How do you know when and how to use fractions?
- Mon Apr 30, 2018 2:12 pm
- Forum: DeBroglie Equation
- Topic: De Brogile's equation [ENDORSED]
- Replies: 4
- Views: 594
Re: De Brogile's equation [ENDORSED]
Why do photons not have mass?? doesn't every existing thing have mass?
- Sun Apr 15, 2018 12:51 pm
- Forum: Empirical & Molecular Formulas
- Topic: Molecular to Empirical [ENDORSED]
- Replies: 12
- Views: 1869
Re: Molecular to Empirical [ENDORSED]
Just divide by a common denominator to get the empirical formula.
- Sun Apr 15, 2018 12:50 pm
- Forum: Limiting Reactant Calculations
- Topic: Theoretical Yield [ENDORSED]
- Replies: 6
- Views: 1048
Re: Theoretical Yield [ENDORSED]
Do they have to give you the actual yield to calculate the percent theoretical yield?
- Sun Apr 15, 2018 12:49 pm
- Forum: Balancing Chemical Reactions
- Topic: Suggestions for Balancing Reactions
- Replies: 8
- Views: 960
Suggestions for Balancing Reactions
When I get stuck on balancing equations does anyone have any tips?
- Sun Apr 15, 2018 12:46 pm
- Forum: General Science Questions
- Topic: Rusty on High School Chem [ENDORSED]
- Replies: 347
- Views: 415864
Re: Rusty on High School Chem [ENDORSED]
Make sure that you use units when you are doing stoichiometry. Keeping track of units will help you in the long run for your answer.
- Sun Apr 15, 2018 12:36 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Formula Units
- Replies: 6
- Views: 16723
Re: Formula Units
To calculate formula units, you use 6.022 x 10^23.
- Sun Apr 15, 2018 12:35 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Molar Mass
- Replies: 9
- Views: 1045
Re: Molar Mass
The correct units for molar mass is grams/mole, so you calculate the grams and that will be equal to one mole.