Search found 32 matches

by Saleha_Mian_3E
Mon Dec 03, 2018 10:17 pm
Forum: Bronsted Acids & Bases
Topic: Bronsted Acids and Bases?
Replies: 2
Views: 85

Bronsted Acids and Bases?

What is the difference between a regular base and acid, and a bronsted acid and base?
by Saleha_Mian_3E
Mon Dec 03, 2018 10:16 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Conjugate?
Replies: 5
Views: 283

Conjugate?

Can someone give an example of conjugates of an acid and base in a chemical equation form?
by Saleha_Mian_3E
Mon Dec 03, 2018 10:14 pm
Forum: Calculating the pH of Salt Solutions
Topic: pH formula?
Replies: 21
Views: 321

pH formula?

What is the pH formula? and do we need to know how it was derived?
by Saleha_Mian_3E
Mon Dec 03, 2018 10:13 pm
Forum: Lewis Acids & Bases
Topic: Base?
Replies: 2
Views: 87

Base?

What is a strong base compared to a weak base? What are the properties of both as well?
by Saleha_Mian_3E
Mon Dec 03, 2018 10:12 pm
Forum: Lewis Acids & Bases
Topic: Acids?
Replies: 2
Views: 69

Acids?

What are a strong acid v.s. a weak acid? What are the properties of both?
by Saleha_Mian_3E
Mon Dec 03, 2018 10:10 pm
Forum: Conjugate Acids & Bases
Topic: Ligands?
Replies: 1
Views: 54

Ligands?

What are ligands and can someone give an example of one? Thanks!
by Saleha_Mian_3E
Thu Nov 22, 2018 11:16 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lewis structure of CNO- with regards to formal charge
Replies: 2
Views: 346

Re: Lewis structure of CNO- with regards to formal charge

the more electronegative atom will get the formal charge of negative one because it will help draw the resonance structure
by Saleha_Mian_3E
Thu Nov 22, 2018 11:11 pm
Forum: Electronegativity
Topic: polarizability of cations
Replies: 2
Views: 63

Re: polarizability of cations

both are important to know, but the charge is what tells you the polarizability of the cation. Also the trend in the periodic table will help to understand the size of the atom and how much it will interact with the other atoms, since the trend is the same.
by Saleha_Mian_3E
Thu Nov 22, 2018 11:06 pm
Forum: Sigma & Pi Bonds
Topic: Clarification of Pi Bonds and Rotation
Replies: 3
Views: 67

Re: Clarification of Pi Bonds and Rotation

What stood out to me is when he said they can not move like sigma bonds because of the density on both sides, which makes them lock into space since there is no way they can rotate. Hope that helps to visualize!
by Saleha_Mian_3E
Thu Nov 22, 2018 11:01 pm
Forum: Dipole Moments
Topic: Chemistry Community
Replies: 5
Views: 102

Re: Chemistry Community

you can comment by yourself and also comment to someone else, but if you comment to your own post then those do not add to the total number of posts.
by Saleha_Mian_3E
Thu Nov 22, 2018 11:00 pm
Forum: Dipole Moments
Topic: Canceling?
Replies: 3
Views: 85

Re: Canceling?

correct, when they are by magnitude and as you and the previous comment said when they cancel they become non-polar.
by Saleha_Mian_3E
Thu Nov 22, 2018 10:58 pm
Forum: Dipole Moments
Topic: Polarity
Replies: 9
Views: 159

Re: Polarity

linear does not necessarily mean that all elements will be non-polar, like the previous comment said oxygen is more negative, wanting to pull the electrons to have a full valence while nitrogen becomes slightly positive.
by Saleha_Mian_3E
Thu Nov 22, 2018 10:55 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Single Regions?
Replies: 8
Views: 180

Re: Single Regions?

Jovian you're good! this actually helped and I believe some people already helped clear this up, because single regions are related to the electron domain like if it is using the VSEPR model, "AX2" and would be linear this means that either it could have double or single bonds because the ...
by Saleha_Mian_3E
Thu Nov 22, 2018 10:49 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Single Regions?
Replies: 8
Views: 180

Re: Single Regions?

The concept that single, double, and triple bonds are all "single regions" of electron density just means that, when using the VSEPR notation, all individual bonds (whether they are single, double or triple) count as 1 "X" . For example, a central atom attached to two other atom...
by Saleha_Mian_3E
Thu Nov 15, 2018 8:37 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sulfite Ion?
Replies: 2
Views: 72

Sulfite Ion?

I know that the sulfite ion is a trigonal pyramidal, with the bond angles 106 degrees, but why is it not 109.5 degrees which is expected?
by Saleha_Mian_3E
Thu Nov 15, 2018 8:33 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Single Regions?
Replies: 8
Views: 180

Single Regions?

I was looking through the notes and I wrote that single, double, and triple bonds are considered single regions of electron density in VSEPR model, but what does single regions mean in terms of electron density?
by Saleha_Mian_3E
Thu Nov 15, 2018 8:31 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Trigonal Planar
Replies: 5
Views: 98

Trigonal Planar

I know that trigonal planar has a 120 degree bond angle, but I was practicing some problems and do all the trigonal planar structures contain double bonds? Is this significant to the structure?
by Saleha_Mian_3E
Sat Nov 10, 2018 4:22 pm
Forum: *Liquid Structure (Viscosity, Surface Tension, Liquid Crystals, Ionic Liquids)
Topic: Viscosity Picture?
Replies: 2
Views: 229

Viscosity Picture?

Did someone take a picture of the Pentane and Octadecane fluids which he showed in class showing the different viscosity levels of each tube?
by Saleha_Mian_3E
Sat Nov 10, 2018 4:18 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: Induced Dipole-Induced Dipole names?
Replies: 4
Views: 169

Induced Dipole-Induced Dipole names?

Hi, I missed the slide where he mentioned the other names for Induced Dipole-Induced Dipole? I know that they are all explaining the same thing which explains that the fluctuating electron distribution which results in fluctuating dipoles.
by Saleha_Mian_3E
Sat Nov 10, 2018 4:12 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: VSEPR?
Replies: 9
Views: 239

VSEPR?

What does VSEPR stand for and why is it needed to form molecular shapes and structures?
by Saleha_Mian_3E
Wed Oct 31, 2018 3:04 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal Charge variables?
Replies: 2
Views: 77

Formal Charge variables?

I know that the formal charge of an atom indicates a gain or loss of an electron while forming a covalent bond. And the equation is FC=V-(L+(S/2)) but what do the variables in the equation stand for? and could you provide an example.
by Saleha_Mian_3E
Wed Oct 31, 2018 2:58 pm
Forum: Ionic & Covalent Bonds
Topic: Octet Rule
Replies: 7
Views: 159

Re: Octet Rule

I agree what everyone said, but basically the rule says in covalent bonds atoms share electrons until a noble-gas configuration is reached so it helps to check certain Lewis Structures to see the correct structures, there are exceptions like H,He,Li,Be.
by Saleha_Mian_3E
Wed Oct 31, 2018 2:38 pm
Forum: Ionic & Covalent Bonds
Topic: octet rule
Replies: 11
Views: 223

Re: octet rule

the octet rule is in a covalent bonds atoms share electrons until a noble gas configuration is reached. This was seen in the notes when he used the example with two fluorine atoms, combined they follow the octet rule since they have a noble gas configuration with eight electrons each in the valence ...
by Saleha_Mian_3E
Fri Oct 19, 2018 2:31 pm
Forum: *Shrodinger Equation
Topic: Shrodinger Equation Question
Replies: 3
Views: 122

Shrodinger Equation Question

How do you use a wave function to describe an electron in an atom? Also what are the units that are used?
by Saleha_Mian_3E
Fri Oct 19, 2018 2:24 pm
Forum: Photoelectric Effect
Topic: Speed of Light
Replies: 5
Views: 141

Re: Speed of Light

I agree, with everyone basically if the velocity is greater than the speed of light you did something wrong, and then you can problem solve what you did wrong. The speed of light is always greater because nothing is faster than the speed of light.
by Saleha_Mian_3E
Fri Oct 19, 2018 2:20 pm
Forum: Properties of Light
Topic: Inverse Relationships?
Replies: 4
Views: 94

Inverse Relationships?

Can someone explain why the relationship of frequency and wavelength is inversely related? Also what are the units of frequency and wavelength?
by Saleha_Mian_3E
Sat Oct 13, 2018 1:24 pm
Forum: Properties of Electrons
Topic: energy transitions
Replies: 6
Views: 123

Re: energy transitions

The electron transitions excite the atoms and they give off photons with a particular energy, as he said in class.
by Saleha_Mian_3E
Sat Oct 13, 2018 1:21 pm
Forum: Properties of Light
Topic: Black Body Radiation
Replies: 2
Views: 25

Re: Black Body Radiation

I agree with Ethan, he said in class that unlike atoms and molecules which only absorb and emit unique frequencies, black bodies absorb or emit all frequencies but he said not to worry about specific calculation since black bodies are somewhat hard to understand.
by Saleha_Mian_3E
Sat Oct 13, 2018 1:17 pm
Forum: Properties of Light
Topic: Properties of Light - variables?
Replies: 2
Views: 45

Properties of Light - variables?

Hi I know that a property of light is electromagnetic radiation, but what are the variables that equal the speed of light? and what do the variables stand for?
by Saleha_Mian_3E
Thu Oct 04, 2018 5:34 pm
Forum: Significant Figures
Topic: Rounding off/sig figs during steps of a calculation
Replies: 4
Views: 106

Re: Rounding off/sig figs during steps of a calculation

I agree with Atul, maybe use a fraction in your calculation. But you could also just keep the repeating numbers to how much your calculator can fit if you are running out of time. Rounding off can make your answer less accurate so it is better to use sig figs at the end.
by Saleha_Mian_3E
Thu Oct 04, 2018 5:28 pm
Forum: SI Units, Unit Conversions
Topic: SI Units
Replies: 7
Views: 174

Re: SI Units

I agree, it depends on the problem if it asks for kg or g. I think when he meant to use kg for SI units he meant don't use pounds (lbs) because that is not an SI unit.
by Saleha_Mian_3E
Thu Oct 04, 2018 5:22 pm
Forum: Significant Figures
Topic: SIG FIGS in ratios
Replies: 4
Views: 222

Re: SIG FIGS in ratios

To get an accurate number as the answer you should use Sig figs at the end of your calculation.

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