Search found 65 matches

by KenRios_Dis2J
Sun Jan 19, 2020 11:35 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: K vs Q
Replies: 14
Views: 28

Re: K vs Q

K is a constant used when the rxn is at equilibrium. Q can be used at any time in the rxn to determine the shift of a rxn, either left or right.
by KenRios_Dis2J
Sun Jan 19, 2020 11:30 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Relationship between pressure and volume
Replies: 10
Views: 19

Re: Relationship between pressure and volume

As formerly mentioned, pressure and volume are inversely proportional. When volume decreases, pressure increases. When volume increases, pressure decreases.
by KenRios_Dis2J
Sun Jan 19, 2020 11:27 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Effect of increasing pressure on reactions
Replies: 6
Views: 15

Re: Effect of increasing pressure on reactions

The reaction would shift towards the side with fewer moles!
by KenRios_Dis2J
Sun Jan 19, 2020 11:22 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 5% rule
Replies: 8
Views: 24

Re: 5% rule

We test it out by dividing equilibrium concentration/initial concentration x 100. if the value is less than 5%, the approximation is valid.
by KenRios_Dis2J
Sun Jan 19, 2020 11:18 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Reaction Shifts Left or Right
Replies: 7
Views: 24

Re: Reaction Shifts Left or Right

The reaction will shift to the left because the reverse reaction is endothermic. Increasing heat/temperature will cause the rxn to favor the reactants.
by KenRios_Dis2J
Sun Jan 12, 2020 5:54 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: appliction of principle
Replies: 5
Views: 16

Re: appliction of principle

Le Chatelier's Principle applies to changes in temperature, volume or concentration.
by KenRios_Dis2J
Sun Jan 12, 2020 5:52 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Units for K
Replies: 21
Views: 56

Re: Units for K

Equilibrium constants have no units; this is because it is a ratio of similar quantities.
by KenRios_Dis2J
Sun Jan 12, 2020 5:32 pm
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Reaction shifts right or left?
Replies: 14
Views: 56

Re: Reaction shifts right or left?

If the rxn shifts left, that means that a forward reaction is favored, thus producing more reactants. If the rxn shifts right, that means that a reverse reaction is favored, thus producing more products.
by KenRios_Dis2J
Sun Jan 12, 2020 5:28 pm
Forum: Ideal Gases
Topic: Bars vs atmospheres
Replies: 13
Views: 36

Re: Bars vs atmospheres

They are both units of pressure; I think it depends on the question and what units that specific question wants you to use.
by KenRios_Dis2J
Sun Jan 12, 2020 5:15 pm
Forum: Ideal Gases
Topic: Units of Pressure
Replies: 8
Views: 38

Re: Units of Pressure

I do not think we will be expected to memorize them as it will most likely be provided in a formula sheet but it is good to understand them!
by KenRios_Dis2J
Sun Jan 12, 2020 5:12 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: changing conditions
Replies: 6
Views: 18

Re: changing conditions

As explained by Dr. Lavelle, a reaction tends to favor the side that has less substance to reach equilibrium. If we take away product, the reaction will favor the products in order to balance the products and reactants or reach equilibrium.
by KenRios_Dis2J
Sun Jan 12, 2020 5:07 pm
Forum: Ideal Gases
Topic: PV = nRT
Replies: 16
Views: 53

Re: PV = nRT

The P stands for pressure
V is volume
n is the number of moles
R is the ideal gas constant
and T is temperature.
by KenRios_Dis2J
Sun Jan 12, 2020 5:03 pm
Forum: Ideal Gases
Topic: Topics on Test 1
Replies: 36
Views: 162

Re: Topics on Test 1

Test 1 will probably consist of Outline 1 and Outline 2!
by KenRios_Dis2J
Sun Dec 08, 2019 3:38 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7752
Views: 1070940

Re: Post All Chemistry Jokes Here

I am definitely "(dien)" after that chemistry final!!!!
by KenRios_Dis2J
Sun Dec 08, 2019 3:31 pm
Forum: Coordinate Covalent Bonds
Topic: Coordinate Covalent Bond
Replies: 8
Views: 58

Re: Coordinate Covalent Bond

In a regular covalent bond, the atoms involved in the bonding share a pair of electrons. However, in a coordinate covalent bond, two electrons are contributed by a single atom.
by KenRios_Dis2J
Sun Dec 08, 2019 3:27 pm
Forum: Sigma & Pi Bonds
Topic: Sigma Vs Pi
Replies: 10
Views: 62

Re: Sigma Vs Pi

Sigma bonds are stronger than pi bonds because sigma bonds head-on overlap while pi bonds overlap side by side. When there is one bond, that forms a sigma bond. When there are two bonds, there is one sigma bond and pi bond. When there are three bonds, there are 2pi bonds and one sigma bond.
by KenRios_Dis2J
Sun Dec 08, 2019 3:20 pm
Forum: Properties of Light
Topic: Speed of Light
Replies: 7
Views: 71

Re: Speed of Light

The standard unit for speed of light is m / s. The units are also given in the constants sheet provided to us during finals/midterms.
by KenRios_Dis2J
Sun Dec 08, 2019 3:17 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7752
Views: 1070940

Re: Post All Chemistry Jokes Here

When you tell a chemistry joke and there are no reactions :(
by KenRios_Dis2J
Fri Dec 06, 2019 12:16 pm
Forum: Electronegativity
Topic: Periodic Table Trend
Replies: 1
Views: 25

Periodic Table Trend

What is the trend for electronegativity and ionization energy?
by KenRios_Dis2J
Fri Dec 06, 2019 11:41 am
Forum: Coordinate Covalent Bonds
Topic: Coordinate covalent bonds
Replies: 7
Views: 70

Re: Coordinate covalent bonds

I understand the coordinate covalent bonds are covalent bonds in which both electrons come from the same atom, but what does the necessarily mean? I do not quite understand what it is stating.
by KenRios_Dis2J
Fri Dec 06, 2019 11:30 am
Forum: Coordinate Covalent Bonds
Topic: Hemoglobin and Myoglobin
Replies: 1
Views: 24

Hemoglobin and Myoglobin

What about hemoglobin and myoglobin do we need to know for the final?
by KenRios_Dis2J
Fri Dec 06, 2019 11:28 am
Forum: Dipole Moments
Topic: Melting and Boiling Points
Replies: 9
Views: 51

Melting and Boiling Points

Can we assume that melting and boiling points will always be higher for hydrogen bonds than any other intermolecular force?
by KenRios_Dis2J
Fri Dec 06, 2019 11:02 am
Forum: Resonance Structures
Topic: Resonance
Replies: 3
Views: 21

Resonance

Can resonance structures determine the strength of an acid? Or is there no correlation between both?
by KenRios_Dis2J
Fri Dec 06, 2019 10:14 am
Forum: Trends in The Periodic Table
Topic: Atomic Radius vs Ionic Radius
Replies: 3
Views: 30

Atomic Radius vs Ionic Radius

I know atomic radius and ionic radius both follow the same periodic trend but what is the difference between them?
by KenRios_Dis2J
Wed Dec 04, 2019 8:36 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordinate Compounds
Replies: 3
Views: 20

Coordinate Compounds

What are some key concepts to know about coordinate compounds for the final?
by KenRios_Dis2J
Mon Dec 02, 2019 5:48 pm
Forum: Lewis Acids & Bases
Topic: Definition
Replies: 7
Views: 41

Re: Definition

A Lewis acid is an electron-pair acceptor while a Lewis base is an electron-pair donor.
by KenRios_Dis2J
Mon Dec 02, 2019 5:18 pm
Forum: Conjugate Acids & Bases
Topic: Water as an Acid/Base
Replies: 20
Views: 399

Re: Water as an Acid/Base

Yes H2O is an amphoteric compound so it depends fully on what it is reacting with.
by KenRios_Dis2J
Mon Dec 02, 2019 5:13 pm
Forum: Biological Examples
Topic: Chemotherapy
Replies: 6
Views: 42

Re: Chemotherapy

I think for class, we need to know mainly about Cisplatin, which binds to DNA to kill cancer cells.
by KenRios_Dis2J
Mon Dec 02, 2019 4:26 pm
Forum: Lewis Acids & Bases
Topic: Long bonds vs Short bonds?
Replies: 9
Views: 56

Re: Long bonds vs Short bonds?

Since long bonds are farther away from the nuclei, it is easier to remove H+ so thus long bonds are strong acids. Conversely, short bonds are harder to break so they are weak acids.
by KenRios_Dis2J
Mon Dec 02, 2019 4:19 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Class wed 11/27
Replies: 7
Views: 53

Re: Class wed 11/27

Lavelle went over neutralization and relative acidity. He also stated that an acidic solution's H3O+ is greater than OH- and the opposite occurs for basic solutions.
by KenRios_Dis2J
Mon Dec 02, 2019 4:07 pm
Forum: Properties & Structures of Inorganic & Organic Bases
Topic: Ionization in Water
Replies: 8
Views: 255

Re: Ionization in Water

Strong bases are completely ionized in water while weak bases are partially/incompletely ionized in water.
by KenRios_Dis2J
Mon Dec 02, 2019 3:59 pm
Forum: Lewis Acids & Bases
Topic: Lewis acid & Bronstead Acid
Replies: 3
Views: 23

Re: Lewis acid & Bronstead Acid

A Lewis acid is an electron acceptor while a Bronsted acid is a proton donor.
by KenRios_Dis2J
Mon Dec 02, 2019 3:56 pm
Forum: Lewis Acids & Bases
Topic: Weak vs. Strong
Replies: 8
Views: 39

Re: Weak vs. Strong

Strong acids are completely ionized in water or solution while strong bases are completely ionized in solution. Weak acids and bases are partially dissociated in water/solution.
by KenRios_Dis2J
Mon Dec 02, 2019 3:53 pm
Forum: Amphoteric Compounds
Topic: Identifying Amphoteric Compounds
Replies: 5
Views: 28

Re: Identifying Amphoteric Compounds

The one amphoteric compound we have gone over in lecture is H2O since it can act as a base and acid. I think it is sufficient enough to know that H2O is the main amphoteric compound.
by KenRios_Dis2J
Sun Nov 24, 2019 8:25 pm
Forum: Hybridization
Topic: Hybrid orbitals
Replies: 5
Views: 24

Re: Hybrid orbitals

You always draw the Lewis structure first to determine the hybrid orbitals.
by KenRios_Dis2J
Sun Nov 24, 2019 8:18 pm
Forum: Dipole Moments
Topic: Polar or nonpolar
Replies: 8
Views: 67

Re: Polar or nonpolar

O2 would be considered nonpolar since the bonds are evenly distributed and cancel out, thus there is no net dipole. We can also say that because they have the same electronegativity, there is never an electronegativity difference between them, therefore it is nonpolar.
by KenRios_Dis2J
Sun Nov 24, 2019 8:14 pm
Forum: Electronegativity
Topic: Electronegativity
Replies: 12
Views: 77

Re: Electronegativity

The higher the electronegativity, the stronger the bond is and the shorter the bond length is. Since the electronegativity is higher, then the closer a bond becomes to being ionic rather than covalent.
by KenRios_Dis2J
Sun Nov 24, 2019 8:10 pm
Forum: Sigma & Pi Bonds
Topic: Sigma and Pi Bonds
Replies: 7
Views: 39

Re: Sigma and Pi Bonds

A single bond is a sigma bond, while a pi bond occurs with double and triple bonds. For double bonds, there is one pi bond and sigma bond. For a triple bond, there is two sigma bonds and one pi bond.
by KenRios_Dis2J
Sun Nov 24, 2019 8:08 pm
Forum: Ionic & Covalent Bonds
Topic: Hydrogen Bond Sites
Replies: 5
Views: 62

Re: Hydrogen Bond Sites

If an H bonds with a Fluorine, Nitrogen, or Oxygen, it is considered a hydrogen bond.
by KenRios_Dis2J
Sun Nov 24, 2019 8:07 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordinate covalent bonds
Replies: 5
Views: 29

Re: Coordinate covalent bonds

A coordinate covalent bond is when one atom donates both electrons in a covalent bond.
by KenRios_Dis2J
Sun Nov 24, 2019 8:00 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent Shape
Replies: 29
Views: 185

Re: Bent Shape

A bent shape can have up to one or two lone pairs around the central atom.
by KenRios_Dis2J
Sun Nov 17, 2019 8:26 pm
Forum: Bond Lengths & Energies
Topic: Electron Density
Replies: 10
Views: 60

Re: Electron Density

Yes, lone pairs are considered regions of electron density because they alter the molecular structure significantly. For example, a lone pair on a central atom can turn a trigonal planar into a trigonal pyramidal.
by KenRios_Dis2J
Sun Nov 17, 2019 8:23 pm
Forum: Bond Lengths & Energies
Topic: Shorter bond lengths
Replies: 12
Views: 69

Re: Shorter bond lengths

The bond length between atoms with two or more bonds are shorter than those with single bonds. The more electrons, the stronger the pull is and the shorter the bond length is.
by KenRios_Dis2J
Sun Nov 17, 2019 8:16 pm
Forum: Bond Lengths & Energies
Topic: Angle Distortion
Replies: 4
Views: 32

Re: Angle Distortion

We can tell when a VSEPR model has distortion because usually the central atom will have a lone pair or more. When the central atom has a lone pair, it pushes the bond electrons closer to one another, thereby making the bond angle smaller.
by KenRios_Dis2J
Sun Nov 17, 2019 8:12 pm
Forum: Dipole Moments
Topic: Polarity
Replies: 7
Views: 45

Re: Polarity

For a molecule to be polar, it must possess a non-zero value of dipole moment. In the molecule CCl4, the bond polarity is canceled by the symmetric tetrahedral shape causing the dipole moment to be zero.
by KenRios_Dis2J
Sun Nov 17, 2019 8:05 pm
Forum: Bond Lengths & Energies
Topic: Bond Length
Replies: 10
Views: 64

Re: Bond Length

The bond length is determined experimentally, so we do not determine the bond lengths ourselves.
by KenRios_Dis2J
Sun Nov 03, 2019 10:29 pm
Forum: Bond Lengths & Energies
Topic: Why Are Double Bonds Shorter
Replies: 16
Views: 173

Re: Why Are Double Bonds Shorter

Double bonds are shorter because the pull/attraction to the nucleus is greater than single bonds.
by KenRios_Dis2J
Sun Nov 03, 2019 10:24 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Distorted Electrons
Replies: 4
Views: 33

Re: Distorted Electrons

What exactly are the characteristics of distorted electrons?
by KenRios_Dis2J
Sun Nov 03, 2019 10:22 pm
Forum: Electronegativity
Topic: electronegativity trend
Replies: 9
Views: 36

Re: electronegativity trend

Electronegativity goes down the periodic table because as the electrons are farther away from the nucleus, there is decreased attraction thereby lessening the pull.
by KenRios_Dis2J
Sun Nov 03, 2019 10:19 pm
Forum: Coordinate Covalent Bonds
Topic: Coordinate Covalent Bonds
Replies: 5
Views: 99

Coordinate Covalent Bonds

What is exactly the significance of coordinate covalent bonds and how does it help us understand bond structure in general?
by KenRios_Dis2J
Sun Nov 03, 2019 10:17 pm
Forum: Octet Exceptions
Topic: Expanded Valence Shells
Replies: 6
Views: 31

Re: Expanded Valence Shells

Elements past the third period can have expanded valence shells due to the presence of a d-orbital.
by KenRios_Dis2J
Sun Oct 27, 2019 2:32 pm
Forum: Ionic & Covalent Bonds
Topic: Covalent bonds
Replies: 5
Views: 47

Re: Covalent bonds

Usually, covalent bonds are between two nonmetals and involves the sharing of electron pairs between atoms. There might be some exceptions to it, as the individual above stated but mainly, covalent bonds are between two nonmetals.
by KenRios_Dis2J
Sun Oct 27, 2019 2:25 pm
Forum: Lewis Structures
Topic: Anion/Cations
Replies: 2
Views: 26

Anion/Cations

How exactly would I represent anions and cations in Lewis structures? Would these be implied by removing an electron from the Lewis structure if it is cation and adding an electron if it is an anion?
by KenRios_Dis2J
Sun Oct 27, 2019 2:20 pm
Forum: Lewis Structures
Topic: Expanded Octet
Replies: 6
Views: 29

Re: Expanded Octet

It is stated that d-orbitals can carry more than 8e-. The examples that Dr. Lavelle gave in lecture were the elements, Chlorine, Phosphorus and Sulfur.
by KenRios_Dis2J
Sun Oct 27, 2019 2:11 pm
Forum: Resonance Structures
Topic: Resonance
Replies: 8
Views: 41

Resonance

Is the purpose of resonance structures to help us draw the best/most accurate Lewis Structure? I am still slightly confused on resonance and what the purpose of it is.
by KenRios_Dis2J
Sun Oct 27, 2019 1:29 pm
Forum: Lewis Structures
Topic: Clarification
Replies: 6
Views: 53

Clarification

Can someone explain whether the octet rule is more important than obtaining a 0 formal charge or vice versa?
by KenRios_Dis2J
Sun Oct 13, 2019 8:44 pm
Forum: Properties of Light
Topic: Quick question on equations
Replies: 5
Views: 36

Re: Quick question on equations

It is definitely better to know the equations and have them memorized but I believe that most equations will be provided in the first sheet of any test given.
by KenRios_Dis2J
Sun Oct 13, 2019 8:38 pm
Forum: Properties of Light
Topic: Photoelectric Effect
Replies: 7
Views: 38

Re: Photoelectric Effect

Since a vacuum chamber is a rigid enclosure, less interference occurs and the results can be more accurate.
by KenRios_Dis2J
Sun Oct 13, 2019 7:58 pm
Forum: Einstein Equation
Topic: E=hv
Replies: 43
Views: 1997

Re: E=hv

E in the equation represents energy but can also be used to find the energy needed to remove an electron!
by KenRios_Dis2J
Sun Oct 13, 2019 7:44 pm
Forum: DeBroglie Equation
Topic: DeBroglie Equation
Replies: 9
Views: 83

Re: DeBroglie Equation

The DeBroglie Equation can not be applied to light because light has no mass.
by KenRios_Dis2J
Sun Oct 13, 2019 12:39 am
Forum: Properties of Light
Topic: Frequency vs. Wavelength
Replies: 15
Views: 95

Re: Frequency vs. Wavelength

Frequency and wavelength are related to one another. Waves with higher frequencies have shorter wavelengths while lower frequencies have longer wavelengths.
by KenRios_Dis2J
Fri Oct 04, 2019 1:17 am
Forum: Molarity, Solutions, Dilutions
Topic: HW question G11
Replies: 3
Views: 28

Re: HW question G11

As previously mentioned, we need to isolate the liters of the solution because that is what the question is asking for. Thus, we would manipulate the equation molarity = (moles solute/L solution) to become L solution = (moles solute/molarity). Then we plug in all the numbers that were given and solv...
by KenRios_Dis2J
Fri Oct 04, 2019 1:10 am
Forum: Limiting Reactant Calculations
Topic: M.11
Replies: 3
Views: 84

Re: M.11

Everything is definitely correct up until you multiplied 0.040 mol O2. Your molar ratio is switched! You want to get ride of mol O2, therefore you want to multiply 0.040 mol O2 by (1mol P4O10/2molO2) Thus, both mol O2 cancel out and the answer becomes 0.020 mol P4O10. I hope this helps!
by KenRios_Dis2J
Fri Oct 04, 2019 1:04 am
Forum: SI Units, Unit Conversions
Topic: Sig Fig Rules
Replies: 2
Views: 35

Sig Fig Rules

Is the rule for sig figs that same for both addition/subtration and multiplicatiopn/division or do they differ?
by KenRios_Dis2J
Fri Oct 04, 2019 1:01 am
Forum: Significant Figures
Topic: How many sig figs when in decimals?
Replies: 6
Views: 73

Re: How many sig figs when in decimals?

I attended Step-Up session today and we went over sig figs. The UA told us to remember this:
1) Non-zero digits are always significant.
2) Any zero between two digits are significant.
3) Final zero or trailing zero in decimal portion ONLY are significant.
Hope this helps!

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