Search found 31 matches

by Ivan Tadeja 4B
Sat Dec 08, 2018 6:47 pm
Forum: Dipole Moments
Topic: Strengths if Intermolecular Forces
Replies: 1
Views: 220

Strengths if Intermolecular Forces

I remember earlier in the year when we went over the different types of bonding that take place within molecules (dispersion, dipole-dipole, hydrogen). Can somebody explain how to identify these bonds by looking at the lewis structure? Also I remember that there was an order which went from weakest ...
by Ivan Tadeja 4B
Sat Dec 08, 2018 6:37 pm
Forum: Lewis Acids & Bases
Topic: 6th edition 12.17
Replies: 5
Views: 95

Re: 6th edition 12.17

Alma Carrera 3C wrote:Is there a way to tell based on the lewis structures or do we just have to remember this?


I would just remember the trends. (Nonmetal oxides = acidic, metal oxides = basic) BaO is basic because when it reacts with water, Ba(OH)2 is formed which means OH is formed.
by Ivan Tadeja 4B
Fri Dec 07, 2018 11:52 pm
Forum: Bronsted Acids & Bases
Topic: Question 12.9 (Sixth Edition)
Replies: 1
Views: 67

Re: Question 12.9 (Sixth Edition)

I'm actually pretty stumped on this one as well, I'm not exactly sure what the text means by writing the net ionic equations.
by Ivan Tadeja 4B
Fri Dec 07, 2018 8:51 pm
Forum: Resonance Structures
Topic: Delocalization
Replies: 6
Views: 516

Re: Delocalization

In resonance, a lone pair can sometimes be in different locations with respect to the configuration. For example, drawing the lewis structure for would result in resonance between two different structures in which the lone electron pair can be placed on either oxygen atom.
by Ivan Tadeja 4B
Fri Dec 07, 2018 8:41 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge vs Partial charge
Replies: 4
Views: 366

Re: Formal Charge vs Partial charge

Formal charge is used primarily in lewis structures and molecular formulas and the charges (if any) on both must be equivalent. This gives us an indication of the stability of a molecule, with FC=0 being optimal. Partial charge shows us electronegativity, and is a basis for determining how badly a m...
by Ivan Tadeja 4B
Fri Dec 07, 2018 8:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone pairs on octahedral electron density
Replies: 3
Views: 95

Re: Lone pairs on octahedral electron density

With every other VSEPR shape, 1 removed molecule removed will affect the configuration in different ways with respect to the one removed, thus resulting in different possible bond angles in some. With octahedral, no matter which one is removed, the result will always be the same.
by Ivan Tadeja 4B
Fri Dec 07, 2018 8:18 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Determining polar and non polar molecules from a lewis structure
Replies: 8
Views: 181

Re: Determining polar and non polar molecules from a lewis structure

How do you know HCN is polar or non polar? There is a negative charge on the N and a positive charge on the H. When drawing the lewis structure, you notice that the CN bond is a triple bond with a lone pair while the HC bond is only a single bond. Thus, the dipole moments do not cancel which makes ...
by Ivan Tadeja 4B
Fri Dec 07, 2018 8:11 pm
Forum: Amphoteric Compounds
Topic: What makes something amphoteric?
Replies: 6
Views: 288

Re: What makes something amphoteric?

Compounds that demonstrate both acidic and basic properties, and can act as either an acid or a base are charactarized as amphoteric. Metal oxides as well as hydroxides are examples of amphoteric compound, with its acidic or basic nature being in respect to their oxidizations.
by Ivan Tadeja 4B
Fri Dec 07, 2018 8:04 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Ranking strong acids and bases
Replies: 4
Views: 107

Re: Ranking strong acids and bases

Polarity and electronegativity are the easiest way to determine strength. Strength of acidity is based upon its ability to lose a proton. Strong acids dissociate completely in water while weak acids only dissolve partially.
by Ivan Tadeja 4B
Tue Dec 04, 2018 2:24 pm
Forum: Sigma & Pi Bonds
Topic: Strength of Sigma and Pi Bonds
Replies: 5
Views: 316

Re: Strength of Sigma and Pi Bonds

The overlap of pi bonds are smaller than the overlap of sigma bonds, making pi bonds easier to break apart. Hence, sigma bonds are stronger.
by Ivan Tadeja 4B
Tue Dec 04, 2018 2:20 pm
Forum: Sigma & Pi Bonds
Topic: Pi bonds
Replies: 4
Views: 290

Re: Pi bonds

Think of a line intersecting a figure 8 in 3D. If you combine the two then the sides of the 8's would touch "88". Rotating one of them away from you or towards you would break the bond between, which is why pi bonds do not permit the rotation about an axis.
by Ivan Tadeja 4B
Tue Dec 04, 2018 2:12 pm
Forum: Hybridization
Topic: P orbital
Replies: 7
Views: 114

Re: P orbital

Unless there is only one region of electron density, then there will always be a "p" proceeding the "s".
by Ivan Tadeja 4B
Tue Dec 04, 2018 2:08 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: polarity
Replies: 11
Views: 175

Re: polarity

With that logic, it would make sense that due to the presence of a lone pair then the shape would not be symmetrical, therefore electrons would not be evenly shared. However I would say drawing out the structure just to demonstrate and prove its polarity. I'm not sure that your reasoning would suffi...
by Ivan Tadeja 4B
Tue Dec 04, 2018 1:59 pm
Forum: Amphoteric Compounds
Topic: amphoteric substances
Replies: 3
Views: 102

Re: amphoteric substances

I believe that there is some sort of pattern on the periodic table which begins with Be and goes diagonal downwards ending in Bi. This would be in the case of Oxides.
by Ivan Tadeja 4B
Sun Nov 11, 2018 11:43 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shape
Replies: 5
Views: 110

Re: Molecular Shape

If there are no lone pairs on the central atom, then the configuration is linear which means the bond angle will always be 180 degrees.
by Ivan Tadeja 4B
Sun Nov 11, 2018 11:38 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Naming bond angles
Replies: 1
Views: 47

Re: Naming bond angles

I would say that the names of the molecular shapes should be memorized. They correspond with line pairs of electrons which can be seen through lewis structures. Linear, Trigonal Planar, Tetrahedral, Trigonal Bipyramidal, and Octahedral, are all possible configurations corresponding to VSEPR theory a...
by Ivan Tadeja 4B
Sun Nov 11, 2018 11:27 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond angles
Replies: 3
Views: 72

Re: Bond angles

I believe that it has something to do with the shape of the molecule. VSEPR configurations include shapes such as: linear, trigonal, tetrahedral, etc... and since we know that each of the electrons distance themselves equally then we can use this to determine the angle. Ex: 2 molecules would be 180 ...
by Ivan Tadeja 4B
Sun Nov 11, 2018 11:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar and Non-polar
Replies: 3
Views: 63

Re: Polar and Non-polar

Polarity relies on the length of the bonds between molecules. I would say that its safe to assume that if the electronegativity is obviously within or beyond the parameters of polarity then we can jump to a conclusion wether or not it is. Other than a brief glance at this pattern, there wouldn't be ...
by Ivan Tadeja 4B
Sun Nov 04, 2018 8:51 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge on Central Atom
Replies: 9
Views: 190

Re: Formal Charge on Central Atom

Formal charge is utilized in order to predict reactivity with the closer the charge being to 0, the more stable it becomes.
by Ivan Tadeja 4B
Sun Nov 04, 2018 8:33 pm
Forum: Resonance Structures
Topic: Purpose of Resonance Hybrids
Replies: 4
Views: 110

Re: Purpose of Resonance Hybrids

To my understanding, the easiest way for me to understand resonance hybridization is that it gives us the set of all possibilities/configurations for a particular molecule and that the actual representation would be a combination of all those possibilities.
by Ivan Tadeja 4B
Sun Nov 04, 2018 8:22 pm
Forum: Octet Exceptions
Topic: Valence Electron
Replies: 2
Views: 96

Re: Valence Electron

The big concept behind valence electrons are that they are ones in the orbitals furthest out and unfilled. 5s^2 and 5p^3 are not filled orbitals and therefore the number of valence electrons for the element Sb = 5. For Mn, the electron configuration would be [Ar]3d^5 4s^2. In this case as Venya said...
by Ivan Tadeja 4B
Sun Oct 28, 2018 11:52 pm
Forum: Octet Exceptions
Topic: do we nee to memorize the octet exceptions?
Replies: 6
Views: 349

Re: do we nee to memorize the octet exceptions?

Kailie_Giebink_1E wrote:will we need to know this for the test??


I would memorize these just in case. Overall it's couldn't hurt just to memorize the 4 exceptions, but it would benefit more if you knew the reasoning and concepts behind. They can help you understand electron configurations as a concept all together.
by Ivan Tadeja 4B
Sun Oct 28, 2018 11:39 pm
Forum: Lewis Structures
Topic: Lines that Represent Bonds
Replies: 7
Views: 121

Re: Lines that Represent Bonds

As far as I understand, both methods represent the same configuration but the solid lines are used because it makes things more obvious in terms of shared/bonded electrons.
by Ivan Tadeja 4B
Sun Oct 28, 2018 11:35 pm
Forum: Ionic & Covalent Bonds
Topic: Roman numerals next to element
Replies: 8
Views: 600

Re: Roman numerals next to element

The roman numeral proceeding the element name represents the charge of the element.
by Ivan Tadeja 4B
Fri Oct 12, 2018 6:04 pm
Forum: DeBroglie Equation
Topic: "Wave-like Properties" of Matter
Replies: 6
Views: 86

Re: "Wave-like Properties" of Matter

From what Dr. Lavelle told us in lecture, it is to my understanding that with such small margins, he would not make us determine what would be acceptable to apply wave length properties to. The general concept was that wave length properties are only applied to matters at the micro level as opposed ...
by Ivan Tadeja 4B
Fri Oct 12, 2018 6:00 pm
Forum: Photoelectric Effect
Topic: Variable for frequency
Replies: 6
Views: 107

Re: Variable for frequency

The variables representing different values can be manipulated to your benefit, if you were to chose any other variable that you would know for a fact you would be able to distinguish, I don't see a reason why you shouldn't. The answer won't be any different as long as the true representations of th...
by Ivan Tadeja 4B
Fri Oct 12, 2018 5:57 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Solving for frequency
Replies: 3
Views: 84

Re: Solving for frequency

Hertz (Hz) is the unit of measurement used when denoting frequency which is why it would be proper to express a frequency in terms of hertz.
by Ivan Tadeja 4B
Fri Oct 05, 2018 1:13 pm
Forum: Empirical & Molecular Formulas
Topic: Compound Names
Replies: 9
Views: 331

Re: Compound Names

Nitric acid is a compound that may be used more as the quarter goes on, it is one of the simpler ones but for many of us we wouldn't be able to solve the problem due to the composition not being given. Nitric acid is HNO3 and I think that it would be wise to memorize this for it is not an uncommon c...
by Ivan Tadeja 4B
Fri Oct 05, 2018 1:09 pm
Forum: Empirical & Molecular Formulas
Topic: Question F9
Replies: 5
Views: 123

Re: Question F9

For the question, I believe that all it asked for was to give an answer in the form of a ratio, the way information is given to us I don't think that giving the empirical formula would be necessary. It would not be hard to give both answers though.
by Ivan Tadeja 4B
Fri Oct 05, 2018 1:02 pm
Forum: Balancing Chemical Reactions
Topic: How To....
Replies: 16
Views: 687

Re: How To....

Knowing the state of a particular element or compound may be essential in balancing chemical equations, however it may be very difficult to know many of them by heart. In my opinion, knowing the state of the matters are helpful in visualizing a particular reaction but even if not given, the problem ...

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