Search found 25 matches

by KMenjivar_3A
Fri Nov 29, 2019 6:44 pm
Forum: Bronsted Acids & Bases
Topic: Acids and Bases
Replies: 3
Views: 34

Re: Acids and Bases

In order to determine which molecule is an acid or base is examine which one has H+ ions (acidic) while the other has OH- (basic).
by KMenjivar_3A
Wed Nov 27, 2019 11:46 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Acids
Replies: 13
Views: 198

Re: Acids

Any molecule that contains a hydrogen or H+ that molecule will most have a high acidity. And basics will usually have an OH-
by KMenjivar_3A
Wed Nov 27, 2019 11:42 pm
Forum: Lewis Acids & Bases
Topic: Conjugates
Replies: 3
Views: 29

Re: Conjugates

Bases are less electronegative because it has negative charges.
by KMenjivar_3A
Wed Nov 27, 2019 11:40 pm
Forum: Hybridization
Topic: Sigma and Pi Bonds
Replies: 21
Views: 114

Re: Sigma and Pi Bonds

Sigma bonds are single bonds
Double bonds contain on sigma bond plus another bond which is a pi bind.
Triple binds contain one sigma bond and two pi bonds.
by KMenjivar_3A
Fri Nov 22, 2019 12:05 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: AXE Format
Replies: 34
Views: 220

Re: AXE Format

If there is only one X or E there is no need to write the subscribe 1 on it. However, if the number is greater than 1; you should write down the number.
by KMenjivar_3A
Fri Nov 22, 2019 11:16 am
Forum: Bond Lengths & Energies
Topic: Boiling Point vs Melting Point
Replies: 5
Views: 151

Re: Boiling Point vs Melting Point

You're right that the boiling and melting point of a molecule deals with the intermolecular forces. However, melting deals with the change of a solid into a liquid. And boiling is the vaporization of a liquid.
by KMenjivar_3A
Fri Nov 22, 2019 11:10 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shape and Polarity
Replies: 5
Views: 75

Re: Molecular Shape and Polarity

Polarity does affect the shape of the lewis structure. Lone pairs decreases the bond angle due to electron-electron repulsion. As a result, the structure of the molecule will change.
by KMenjivar_3A
Fri Nov 22, 2019 11:06 am
Forum: Dipole Moments
Topic: Lewis Structure and Polarity
Replies: 3
Views: 67

Re: Lewis Structure and Polarity

According to the lewis structure there are no lone pairs on either of the carbons and we can see that the hydrogen doesn't cancel out; therefore, the molecule is polar.
by KMenjivar_3A
Wed Nov 13, 2019 12:41 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shape Name
Replies: 17
Views: 220

Re: Molecular Shape Name

I recommend to learn all the other shapes, including the ones that contain lone pairs.
by KMenjivar_3A
Fri Nov 08, 2019 2:18 pm
Forum: Trends in The Periodic Table
Topic: Atomic Radii
Replies: 10
Views: 104

Re: Atomic Radii

As we go across the period, the atomic radius decrease because protons will be added to the element/atom. As more protons increase the more positive the nuclear charge is. As a result, electrons will be closer to the nucleus resulting it to have a smaller radius.
by KMenjivar_3A
Fri Nov 08, 2019 1:53 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Do higher electronegativity atoms tend to draw more electrons to them?
Replies: 6
Views: 49

Re: Do higher electronegativity atoms tend to draw more electrons to them?

Yes, as you know anions will have a negative charge which pulls more electrons. And electronegativity is the electron’s affinity. Therefore, the more electronegativity the more electrons are pulled.
by KMenjivar_3A
Tue Nov 05, 2019 10:06 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Sr 2+ or Rb 1+
Replies: 6
Views: 46

Re: Sr 2+ or Rb 1+

Another way to look at it is if the positive charge of one element is greater than the other one, the element with the greater charge has a higher polarizing power.
by KMenjivar_3A
Tue Nov 05, 2019 9:56 pm
Forum: Electronegativity
Topic: Ionization Energy
Replies: 3
Views: 39

Re: Ionization Energy

When writing down the electron configuration for each element, you will notice that oxygen has more electrons in the 2p orbital causing electron-electron repulsion. Therefore, oxygen has a lower ionization energy.
by KMenjivar_3A
Fri Nov 01, 2019 4:20 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Configurations in 4d, 5d, etc. orbitals
Replies: 3
Views: 46

Re: Configurations in 4d, 5d, etc. orbitals

Yes, just remember that this technique is lonely allowed once the element is in 3d orbital or higher. Also, you should only use this rule for the d and s orbital.
by KMenjivar_3A
Fri Nov 01, 2019 4:16 pm
Forum: Resonance Structures
Topic: Resonance Hybrid
Replies: 2
Views: 34

Re: Resonance Hybrid

Yes it is necessary. A resonance is when a molecule can be converted in a number of ways while drawing out its Lewis Structure. That is why your TA drew the same molecule several times.
by KMenjivar_3A
Fri Nov 01, 2019 4:12 pm
Forum: Lewis Structures
Topic: Lone Pairs
Replies: 10
Views: 84

Re: Lone Pairs

In Lewis Structures lone pairs are electrons that are not associated with other elements. When it comes to drawling the lewis structure, the lone pairs will be the excess dots that are left over in the central atom.
by KMenjivar_3A
Fri Oct 18, 2019 5:40 pm
Forum: Quantum Numbers and The H-Atom
Topic: spin up and spin down
Replies: 7
Views: 60

Re: spin up and spin down

In this topic, the sign plays a huge role rather than the integer since its only arbitrary. The positive and negative sign represents their spin.
by KMenjivar_3A
Fri Oct 18, 2019 5:37 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: How to Name Electron Configurations
Replies: 5
Views: 38

Re: How to Name Electron Configurations

When it comes to using previous elements in electron configurations, one will need to use the noble gases category since their orbitals are filled. Other than that, the long form is efficient.
by KMenjivar_3A
Fri Oct 18, 2019 5:32 pm
Forum: Properties of Electrons
Topic: "Exception" in Writing Electron Configurations
Replies: 4
Views: 56

Re: "Exception" in Writing Electron Configurations

By following these certain exceptions when it comes to writing electron configurations, these half filled shells are exhibited to be more symmetry and more stable.
by KMenjivar_3A
Fri Oct 18, 2019 5:28 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Hund's Rule
Replies: 4
Views: 50

Re: Hund's Rule

Electrons that have the same principle illustrates that they will have the same energy level. However, when it comes to comparing different orbitals, they will have different energy levels.
by KMenjivar_3A
Fri Oct 11, 2019 10:51 pm
Forum: Empirical & Molecular Formulas
Topic: empirical = molecular?
Replies: 15
Views: 399

Re: empirical = molecular?

If the questions asks to find the molecular and empirical formula, first try to find the empirical formula which is to covert the grams into moles that’s given for each element. Then divide each element by the smallest mole value (for empirical). Remember that the coefficient can only be a whole int...
by KMenjivar_3A
Fri Oct 11, 2019 3:33 pm
Forum: Limiting Reactant Calculations
Topic: percent yield
Replies: 10
Views: 314

Re: percent yield

No, limiting does associate with finding the percent yield; however, calculating the % yield is unnecessary unless the question specifically asks us to solve it.
by KMenjivar_3A
Fri Oct 11, 2019 12:28 pm
Forum: DeBroglie Equation
Topic: Frequency and de Broglie Equation Derivation
Replies: 3
Views: 50

Re: Frequency and de Broglie Equation Derivation

No, electrons has a frequency of zero, Lavelle just demonstrated the different forms of the equation, since in some chemistry problems we will have to use the de Broglie equation.
by KMenjivar_3A
Fri Oct 11, 2019 12:22 pm
Forum: Empirical & Molecular Formulas
Topic: Mass Percentage Question
Replies: 9
Views: 422

Re: Mass Percentage Question

To determine the mass percentage, find the total molar mass of the compound. Then, divide it by the molar mass of each element. Lastly, you will need to multiply it by 100, which will give you the mass percentage.
by KMenjivar_3A
Fri Oct 11, 2019 12:10 pm
Forum: Balancing Chemical Reactions
Topic: Balancing Chemical Reactions
Replies: 20
Views: 474

Re: Balancing Chemical Reactions

First, separate the reactants and products to distinguish the total amount. By looking at the equation, it is clear that the coefficients will have to doubled since there is an uneven number of oxygens in the reactant and product category. In that case, count the total amount for each element to bal...

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