CHEMISTRY COMMUNITY

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Cisplatin is the coordination complex/chemotherapy drug [Pt(Cl)2(NH3)2], so the ligands would be 2 Cl and 2 ammine. Here's a picture of the complex- notice how the atoms are on the same side of the molecule (hence the cis title).

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Yes, I think you are exactly correct in that last statement. On their own, the cation and the anionic complex would have their own charges, but since the counter ion (the cation) is acting on the complex, the complex's charge ( in the square brackets) is -3. +3 and -3 cancel out so the whole interac...

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These are the "fancy transition metal" names that we discussed in my section. Besides that, just add -ate to the ending if the complex has an overall negative charge.

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Still a little confused about why ozone ( O3 ) is considered polar (according to the solutions manual). I understand that it doesn't have a symmetrical shape, but how could this matter if there is no net dipole coming into play? The bonds in the molecule are nonpolar so how could this create a polar...

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A radical is a molecule that contains at least one unpaired electron. Most molecules contain even numbers of electrons. CH3 would be a radical because it has 7 electrons total. C(4)+ 3H(1)=7 electrons. I hope this helped a little bit!

305154707

You can determine which covalent compound has the most ionic character by noting the difference in electronegativity between the two atoms. Surprisingly, H-F is a covalent compound even though H and F have a large difference in electronegativity. This differs from a bond like CH4 or a diatomic homon...

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Yes I believe that the two terms are interchangeable. Bent and angular shapes occur when there are two bonded atoms occurring with an electron pair or several electron pairs.

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If there is great distortion of an electron cloud, it means that electrons are being dispersed over several atoms. The electrons are not hovering around the anion as we would expect them to be if the bond was very ionic or polar. Greater sharing of electrons gives greater covalent character. Hope th...

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You can also base the bonding angles of structures with lone pairs off of those that do not have lone pairs. For example, if you find that your structure has three attached atoms and one electron pair, and is therefore trigonal pyramidal, we can base its angles off of a similar structure with a know...

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Dipole dipole moments are forces of attraction between the oppositely charged ends of polar molecules. London forces (or induced-induced dipoles) are when two things are originally non polar, but when placed next to each other, they become polar. It is a short lived interaction caused by a temporary...

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In this structure, there is an odd number of attached atoms. The angles are also not on a flat plane. So even if all the bonds were non polar, the shape and number of attached atoms would not allow these forces to cancel out. Hope this helped!

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Lone pairs have very strong repulsive forces. Atoms become closer together because the repulsive forces between atoms is less than that of a lone pair and an atom. You can determine the angle by 1. Counting how many domains there are 2. View the "normal" bond angle for the shape (pretend t...

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All bonds have active Vanderwaals forces. The hydrogen bond might be what is determining the character of the connection, but it doesn't mean that the random interactions of electrons and partial charges aren't happening as well. Some Vanderwaal's forces are more noticeable than others, but they are...

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Here's some practice problems I did. Hope this helps you out!

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Lone pair electrons and bonding electrons repel each other because the electrons within them have the same negative charge. The lone pair can serve to push atoms closer together because the repulsion pushes other bonded electrons closer to each other. Hope this helped!

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A Na+ Cl- bond is ionic because there is a large difference in electronegativity. This results in the Cl- anion taking an electron from the Na+, hence the more negative charge that Cl has. For ionic bonds, the electronegativity difference is so great that the two atoms cannot share electrons equally...

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There are not really any units for electronegativity because it is more of a periodic trend. However, a related charge difference can be measured by an electric dipole moment. This is notated by the greek letter "mu" and its units are called a debye (D, SI units: Columbs.m). However, I thi...

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Hi ! This was discussed in relation to polar covalent bonds. In these types of bonds, one atom will always be more electronegative than the other(s), giving a separation of charge. In this case you could draw the arrow showing the direction of the dipole/dipole moment. A nonpolar covalent bond has a...

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My lecture notes say that an increasing difference in electronegativity leads to an increasing ionic character of a covalent bond. Am I right when I say that all ionic bonds have a degree of covalent character or are they completely separate distinctions?

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It helps me to memorize the units of Planck's constant/J (kgm^2^s^2) since I know that anything I enter into the equation from there will either have to be of these units or converted to them so I can cancel out. So mass would be in kg and velocity would be in m/s.

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An object like a car would have too great a mass to produce measurable wavelike properties. In some of the homework problems, cars yielded a projected wavelength of about 10^-38m. This wavelength would be too small to be considered noticeable, although we have detected it. Only very small particles ...

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Yes. Delta x is the span of possible answers for the position of an object. So for example, if your delta x is 10 then your range is +/- 5.

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How does the presence or absence of a nodal plane affect electrostatic attraction? And what does this mean for atoms with multiple electrons? Also, how does this work with Coulomb's equation?

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In the lecture and online modules, I remember that professor Lavelle said that energy cannot be negative. However, in my discussion section we discussed that the change in energy is equal to the negative energy of the photon. Can someone explain this to me and let me know when it's okay to explain e...

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Can someone help me understand the relationship between the quantum numbers and what they describe for the electron configuration of an atom? How do they relate to energy levels and subshells and such? Thanks.

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Dr. Lavelle showed a diagram similar to this during lecture. Can someone help me understand what the resulting marks of the experiment tell us about light? How would it be different if it was destructive interference instead of constructive?

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Hello! Hopefully the visual attached helps! The diagram with the Balmer and Lyman series can be seen as the Line Absorption Spectrum we drew in class- just tilted sideways. The lines on the horizontal spectrum represent frequency in the system. Looking at the Lyman series, a long "fall" fo...

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The DeBroglie equation comes from a combination of E=mc^2 and E=hv (v is frequency) 1. Substitute "E" for hv, Planck's theory states " every quantum of a wave has a discrete amount of energy " based on E=hv. Broglie believed particles and waves had the same traits, so he set the ...

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Concentration can also be an intensive property. For example, if you have 5.00g of a solution dissolved in a 150.00mL flask and 20.00 mL of the solution is removed and placed into a new solution (this is #25 on the molarity module), then the initial molarity will stay the same. Although there is now...

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This problem gives the work function for sodium as 150.6 kJmol-1. Then, in the following part of the question, it asks for the energy required to remove an electron from one sodium atom. Given that the work function is the same as the " energy required to remove an electron", why can't I j...

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On the post-assessment for the limiting reactant video module, there is a problem concerning an acid spill and a neutralizing anti acid ( see the attached file or problem 20 on the assessment itself.) The mass of the anti acid reactant is given, but the mass of the acid is not. Isn't this informatio...

CHEMISTRY COMMUNITY

Search found 31 matches

Re: cisplatin Ligands?

Re: confusion name to formula

Re: Anionic complex name

Ozone and polarity

Re: 4.73

Re: Ionic and Covalent Character

Re: Bent/Angular Shape

Re: covalent character

Re: 6th edition 4.13

Re: Intermolecular Forces

Re: polar molecules

Re: Lone Pairs

Re: Hydrogen Bonds and Van Der Waals

Re: Ionic compound

Re: Bond Strength

Re: Covalent vs Ionic Characteristics

Re: Units for EN

Re: Dipole

"ionic character"

Re: Units

Re: wavelike properties

Re: Indeterminacy Question

Nodal planes and electrostatic interactions

"Energy can't be negative"

Conceptual Question

Diffraction Pattern with Constructive Interference

Re: Context?

Re: De Broglie Equation

Re: Extensive vs. Intensive

Threshold Energy Question

Post-assessment problem, neutralizing acids