Search found 51 matches

by Haley Pham 4I
Sun Dec 08, 2019 5:00 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: melting point
Replies: 4
Views: 33

Re: melting point

Molecules with a higher melting point would have stronger intermolecular forces. If the molecules you are comparing have the same IMF's, you would then look at the atom size. Bigger atoms would have a higher melting point because they are more polarizable, which creates greater attractive forces, ma...
by Haley Pham 4I
Sun Dec 08, 2019 4:55 pm
Forum: Lewis Acids & Bases
Topic: Mg(OH)2 Considered strong or weak base?
Replies: 5
Views: 45

Re: Mg(OH)2 Considered strong or weak base?

Mg(OH)2 is a strong base because hydroxides in Groups 1 and 2 in the Periodic table are considered strong bases.
by Haley Pham 4I
Sun Dec 08, 2019 4:52 pm
Forum: Industrial Examples
Topic: Chemotherapy
Replies: 5
Views: 57

Re: Chemotherapy

Cisplatin is a chemotherapy drug that binds to DNA by substituting Cl for two adjacent Guanines. It blocks cell division (replication), which treats cancer.
by Haley Pham 4I
Sun Dec 08, 2019 4:49 pm
Forum: Naming
Topic: bis- tris- tetrakis-
Replies: 8
Views: 74

Re: bis- tris- tetrakis-

These prefixes would be used for polydentates.
by Haley Pham 4I
Sun Dec 08, 2019 4:48 pm
Forum: Resonance Structures
Topic: Molecules with resonance
Replies: 4
Views: 52

Re: Molecules with resonance

Acids with resonance are stronger because resonance stabilizes the anion by withdrawing electron density and spreading out the charge.
by Haley Pham 4I
Sun Dec 08, 2019 4:45 pm
Forum: Dipole Moments
Topic: Hydrogen bonding AND Dipole-Dipole?
Replies: 3
Views: 24

Re: Hydrogen bonding AND Dipole-Dipole?

Although it is redundant, it is still best to indicate that there are both hydrogen bonds and dipole-dipole forces.
by Haley Pham 4I
Sun Dec 01, 2019 1:26 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Difference between Arrhenius, Bronsted, and Lewis
Replies: 5
Views: 38

Re: Difference between Arrhenius, Bronsted, and Lewis

An Arrhenius acid is a molecule that donates an H+ ion when dissolved in water, so it is a proton donor. An Arrhenius base is a molecule that yields an OH- ion when dissolved in water. Bronsted-Lowry acids are proton donors, and Bronsted-Lowry bases are proton acceptors. Lewis acids are electron pai...
by Haley Pham 4I
Sun Dec 01, 2019 1:15 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Amphoteric vs. Amphiprotic
Replies: 4
Views: 24

Re: Amphoteric vs. Amphiprotic

Amphiprotic substances can both accept and donate an H+ ion (proton). Amphoteric substances are both acidic and basic in character and can react with acids and bases.
by Haley Pham 4I
Sun Dec 01, 2019 1:06 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Sigma and Pi Bonds
Replies: 12
Views: 329

Re: Sigma and Pi Bonds

A triple bond has one one sigma bond and two pi bonds.
by Haley Pham 4I
Sun Dec 01, 2019 1:00 am
Forum: Naming
Topic: Naming Coordination Compounds
Replies: 3
Views: 32

Naming Coordination Compounds

What are the steps in naming coordination compounds?
by Haley Pham 4I
Sun Nov 24, 2019 3:25 am
Forum: Dipole Moments
Topic: Dipole Induced- Dipole Induced
Replies: 13
Views: 87

Re: Dipole Induced- Dipole Induced

Induced dipole - induced dipole forces are the weakest form of intermolecular forces and are present in all molecules.
by Haley Pham 4I
Sun Nov 24, 2019 3:21 am
Forum: Hybridization
Topic: Strength of sigma and pi bonds
Replies: 8
Views: 33

Re: Strength of sigma and pi bonds

The electrons in a sigma bond are directly between the nuclei of the atoms are as close to the nuclei as possible, so the nuclei strongly hold onto the electrons, making it difficult to break the bond. The electrons in a pi bond are further away from the nuclei, so the nuclei weakly attract the elec...
by Haley Pham 4I
Sun Nov 24, 2019 3:15 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: dipole-dipole in a solid phase vs gas phase
Replies: 15
Views: 94

Re: dipole-dipole in a solid phase vs gas phase

Dipole-dipole in the solid phase is stronger than dipole-dipole in the gas phase because the bonds in solids are stronger, thus the attraction between molecules is greater.
by Haley Pham 4I
Sun Nov 24, 2019 3:10 am
Forum: Sigma & Pi Bonds
Topic: Rotation
Replies: 3
Views: 20

Re: Rotation

Pi bonds consist of orbitals that are aligned side-by-side, in which one of the two orbitals cannot align in a different position to make the bond. Sigma bonds consist of orbitals that are aligned end-to-end, which allow them to rotate.
by Haley Pham 4I
Sun Nov 24, 2019 2:47 am
Forum: Bronsted Acids & Bases
Topic: Bronsted vs. Lewis Acids
Replies: 4
Views: 43

Re: Bronsted vs. Lewis Acids

Bronsted acids are are proton donors, while Lewis acids are electron acceptors. All Bronsted acids are Lewis acids, but not all Lewis acids are Bronsted acids.
by Haley Pham 4I
Sun Nov 17, 2019 10:06 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polarity
Replies: 2
Views: 17

Polarity

How do you predict the polarity of a molecule by its molecular shape?
by Haley Pham 4I
Sun Nov 17, 2019 10:04 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: vsepr angles
Replies: 10
Views: 48

Re: vsepr angles

Yes, you should know the different orientations and bond angles for a particular shape.
by Haley Pham 4I
Sun Nov 17, 2019 10:02 pm
Forum: Dipole Moments
Topic: Effects for boiling point
Replies: 5
Views: 27

Re: Effects for boiling point

Increasing strength of intermolecular forces causes the boiling point to increase.
by Haley Pham 4I
Sun Nov 17, 2019 9:52 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: dipole moments
Replies: 11
Views: 54

Re: dipole moments

The dipoles are vectors, and when they are equal and opposite to to each other, they cancel out.
by Haley Pham 4I
Sun Nov 17, 2019 9:40 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lewis Structures
Replies: 6
Views: 34

Re: Lewis Structures

You can name the shape of the molecule by determining the number of the bound atoms and lone pairs around the central atom, which correlate to a certain shape.
by Haley Pham 4I
Sun Nov 10, 2019 10:59 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: Boiling and Melting Points
Replies: 7
Views: 36

Boiling and Melting Points

How do polarizability and the different intermolecular forces affect the boiling and melting points of compounds?
by Haley Pham 4I
Sun Nov 10, 2019 10:47 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability
Replies: 4
Views: 22

Re: Polarizability

Larger atoms have more electrons and thus more shielding occurs. Thus, because electrons are at a greater distance from the nuclear charge and there is less attraction from the nucleus, the electrons are held more loosely, so the electron cloud is more susceptible to being distorted, making it more ...
by Haley Pham 4I
Sun Nov 10, 2019 10:38 pm
Forum: Ionic & Covalent Bonds
Topic: Bond Strength
Replies: 3
Views: 19

Re: Bond Strength

Ionic bonds are stronger due to the attraction between ions of opposite charges.
by Haley Pham 4I
Sun Nov 10, 2019 10:31 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Writing e- Configurations
Replies: 15
Views: 91

Re: Writing e- Configurations

It depends on what the question asks, it could either ask for the short-hand configuration, in which you would use the noble gas or the extended electron configuration,in which you would write out the full configuration.
by Haley Pham 4I
Sat Nov 02, 2019 10:47 pm
Forum: Lewis Structures
Topic: Delocalized Electrons
Replies: 4
Views: 23

Re: Delocalized Electrons

Delocalized electrons are electrons that are not associated with a single atom or covalent bond, so essentially they have no specific location. Resonance structures depict delocalized bonding because they show bonds in different positions.
by Haley Pham 4I
Sat Nov 02, 2019 10:35 pm
Forum: Empirical & Molecular Formulas
Topic: Formula Units
Replies: 2
Views: 49

Re: Formula Units

Formula units usually apply to ionic compounds, while molecules apply to covalent compounds. In order to calculate formula units and molecules, convert the grams of Al2O3, convert it into moles, then use Avogadro's number 6.022 x 10^23 to find formula units and molecules.
by Haley Pham 4I
Sat Nov 02, 2019 10:25 pm
Forum: Coordinate Covalent Bonds
Topic: Atom Sharing
Replies: 5
Views: 51

Re: Atom Sharing

I believe that is the only difference: in coordinate covalent bonds, one atom donates two electrons to the bond and in covalent bonds, both atoms donate one electron to the bond.
by Haley Pham 4I
Sat Nov 02, 2019 10:16 pm
Forum: Ionic & Covalent Bonds
Topic: Lewis Structure for Ionic Bonds
Replies: 4
Views: 37

Re: Lewis Structure for Ionic Bonds

The brackets go around ionic compounds that have a total net charge.
by Haley Pham 4I
Sat Nov 02, 2019 10:13 pm
Forum: Limiting Reactant Calculations
Topic: Test 1 Question
Replies: 5
Views: 114

Re: Test 1 Question

There is also another way you could solve the problem. In order to determine how many grams of glucose is left over, you would first need to determine how many grams of water the 10.0g of glucose produces. You would convert the grams of glucose that was initially present into moles. Then, you would ...
by Haley Pham 4I
Sun Oct 27, 2019 10:01 pm
Forum: Ionic & Covalent Bonds
Topic: periodic table
Replies: 10
Views: 78

Re: periodic table

Electronegativity increases up into the right of the periodic table.
by Haley Pham 4I
Sun Oct 27, 2019 9:36 pm
Forum: Trends in The Periodic Table
Topic: Electronegativity vs. effective nuclear charge
Replies: 5
Views: 19

Re: Electronegativity vs. effective nuclear charge

Electronegativity is essentially how much an atom pulls in electrons, whereas effective nuclear charge is how strongly an electron is attracted to the nucleus. They are directly proportional.
by Haley Pham 4I
Sun Oct 27, 2019 9:18 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic v. Covalent
Replies: 6
Views: 29

Re: Ionic v. Covalent

Covalent bonds are pairs of electrons that are shared between two non-metal atoms that have similar electronegativities. Ionic bonds form when electrons are transferred from a metal to non-metal atom, which differ significantly in electronegativity. Ionic bonds tend to be stronger than covalent bond...
by Haley Pham 4I
Sun Oct 27, 2019 9:00 pm
Forum: Bond Lengths & Energies
Topic: Delocalization
Replies: 3
Views: 26

Re: Delocalization

Eelectrons involved in resonance structures are delocalized. Electrons that appear in different positions in a set of resonance structures are said to be delocalized, meaning that a shared electron pair is distributed over several pairs of atoms and cannot be identified with just one pair of atoms.
by Haley Pham 4I
Sun Oct 27, 2019 8:38 pm
Forum: Bond Lengths & Energies
Topic: bond lengths for single or double bonds
Replies: 7
Views: 32

Re: bond lengths for single or double bonds

Bond lengths between atoms with multiple bonds are shorter than those with single bonds. Double bonds are shorter than single bonds, and triple bonds are shorter than double bonds.
by Haley Pham 4I
Sun Oct 20, 2019 6:55 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: magnetic quantum #
Replies: 3
Views: 34

Re: magnetic quantum #

Writing 2px, 2py, and 2pz is just an expanded notation of writing the orbitals. Each orbital is represented with a subscript x, y, z. If the 2p orbital is full, it would be 2px^2, 2py^2, 2pz^2. When writing the configuration of an atom with half filled orbitals, the p orbital for example would be 2p...
by Haley Pham 4I
Sun Oct 20, 2019 6:43 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Building Up Principle
Replies: 2
Views: 24

Re: Building Up Principle

The building up (Aufbau Principle) states that an electron occupies orbitals in order from lowest to highest energy. The lowest energy sublevel is the 1s sublevel, then as we go on to atoms with multiple electrons, the electrons are added on creating the 2s, 2p, 3s, etc. sublevels.
by Haley Pham 4I
Sun Oct 20, 2019 6:37 pm
Forum: DeBroglie Equation
Topic: When to use DeBrogile's Equation
Replies: 4
Views: 45

Re: When to use DeBrogile's Equation

DeBroglie's Equation is used for things or particles that have mass and that behave like a wave.
by Haley Pham 4I
Sun Oct 20, 2019 6:33 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Numbers
Replies: 5
Views: 24

Re: Quantum Numbers

The magnetic quantum number tells us about the orientation of the orbitals in relation to other orbitals, which allows us to know more about the electron and its location in the atom.
by Haley Pham 4I
Sun Oct 20, 2019 6:21 pm
Forum: DeBroglie Equation
Topic: Particle-wave duality
Replies: 2
Views: 31

Particle-wave duality

What is the relationship between E=hv and E=mc^2 in the DeBroglie equation?
by Haley Pham 4I
Sun Oct 13, 2019 9:56 pm
Forum: Properties of Light
Topic: photoelectric effect
Replies: 3
Views: 41

Re: photoelectric effect

D. λv = c does not describe the photoelectric effect because the photoelectric experiment was designed to measure the how much energy is required to remove an electron from a metal surface and the kinetic energy of the electron, which is described by answers A, B, and C. Answer choice D describes th...
by Haley Pham 4I
Sun Oct 13, 2019 9:42 pm
Forum: Photoelectric Effect
Topic: Post Assessment Help
Replies: 2
Views: 23

Post Assessment Help

Light hits a sodium metal surface and the velocity of the ejected electron is 6.61 x 10^5 m.s^-1. The work function for sodium is 150.6 kJ.mol^-1. What is the kinetic energy of the ejected electron? a) 3.01 x 10^25 J b) 3.98 x 10^-19 J c) 7.96 x 10^-19 J d) 1.99 x 10^-19 J How do you calculate the k...
by Haley Pham 4I
Sun Oct 13, 2019 9:31 pm
Forum: Photoelectric Effect
Topic: Wavelength, Frequency, and Intensity
Replies: 7
Views: 39

Re: Wavelength, Frequency, and Intensity

A photon must have a wavelength that is lower than the threshold wavelength to have the required energy to eject electrons. According to the equation E = hv = hc/λ (λ being wavelength), having a long wavelength would decrease the energy needed to eject the electrons. Thus, having a shorter wavelengt...
by Haley Pham 4I
Sun Oct 13, 2019 9:12 pm
Forum: Photoelectric Effect
Topic: Equation for threshold energy
Replies: 2
Views: 15

Equation for threshold energy

How do we calculate the threshold energy, or the energy needed to remove an electron from a metal atom? What equation(s) would be used to calculate the threshold energy?
by Haley Pham 4I
Sun Oct 13, 2019 9:05 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect
Replies: 3
Views: 32

Photoelectric Effect

Regarding the experiment in which long wavelength light does not eject electrons from a metal surface even with the increased intensity of the light, if it tells us that light not only has wavelike properties, then what other properties does it have?
by Haley Pham 4I
Sun Oct 06, 2019 5:27 pm
Forum: Molarity, Solutions, Dilutions
Topic: Molar Mass
Replies: 4
Views: 32

Re: Molar Mass

You do not need to memorize the molar masses of all the elements. A periodic table will be provided. Sometimes molar masses of compounds will be given in the problem, but if not, you would have to use the periodic table to calculate the molar mass.
by Haley Pham 4I
Sun Oct 06, 2019 5:19 pm
Forum: Limiting Reactant Calculations
Topic: Step two in limiting reactants
Replies: 3
Views: 38

Re: Step two in limiting reactants

The question in the problem was "In one test the engine burns 1.00L of octane (of mass 702g) and produces 1.84kg of carbon dioxide. What is the percentage yield of carbon dioxide?" The problem asked us to calculate the percentage yield of carbon dioxide. It only gave us the actual yield of...
by Haley Pham 4I
Sun Oct 06, 2019 4:57 pm
Forum: SI Units, Unit Conversions
Topic: 50 Min test
Replies: 4
Views: 47

Re: 50 Min test

The test will take place during your discussion section.
by Haley Pham 4I
Sun Oct 06, 2019 4:56 pm
Forum: Empirical & Molecular Formulas
Topic: empirical and molecular formulas
Replies: 7
Views: 55

Re: empirical and molecular formulas

Yes, sometimes a compound's molecular formula can be the same as its empirical formula if the number of atoms in the empirical formula are the actual number of atoms in the molecular formula. The molecular formula can be the same as the empirical formula or a multiple of it. In a problem where it gi...
by Haley Pham 4I
Sun Oct 06, 2019 4:45 pm
Forum: Limiting Reactant Calculations
Topic: Reactant vs. Reagent
Replies: 4
Views: 50

Re: Reactant vs. Reagent

Chemicals in a lab are called reagents. When a reagent is used in a particular reaction, it is called a reactant.

Go to advanced search