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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).

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Any molecule that contains a hydrogen or H+ that molecule will most have a high acidity. And basics will usually have an OH-

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Bases are less electronegative because it has negative charges.

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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.

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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.

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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.

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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.

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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.

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I recommend to learn all the other shapes, including the ones that contain lone pairs.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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...

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No, limiting does associate with finding the percent yield; however, calculating the % yield is unnecessary unless the question specifically asks us to solve it.

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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.

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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.

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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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Search found 25 matches

Re: Acids and Bases

Re: Acids

Re: Conjugates

Re: Sigma and Pi Bonds

Re: AXE Format

Re: Boiling Point vs Melting Point

Re: Molecular Shape and Polarity

Re: Lewis Structure and Polarity

Re: Molecular Shape Name

Re: Atomic Radii

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

Re: Sr 2+ or Rb 1+

Re: Ionization Energy

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

Re: Resonance Hybrid

Re: Lone Pairs

Re: spin up and spin down

Re: How to Name Electron Configurations

Re: "Exception" in Writing Electron Configurations

Re: Hund's Rule

Re: empirical = molecular?

Re: percent yield

Re: Frequency and de Broglie Equation Derivation

Re: Mass Percentage Question

Re: Balancing Chemical Reactions