Search found 27 matches

by Isabelle_Maletz_3E
Sun Dec 02, 2018 1:56 pm
Forum: Conjugate Acids & Bases
Topic: Strong and Weak Acids and Bases in Relations with H2O
Replies: 3
Views: 64

Re: Strong and Weak Acids and Bases in Relations with H2O

Similar to acids, strong bases will dissociate completely in water forming many hydroxide ions. A weak base will not dissociate and instead be in equilibrium with water.
by Isabelle_Maletz_3E
Sun Dec 02, 2018 1:43 pm
Forum: Naming
Topic: IUPAC
Replies: 2
Views: 75

Re: IUPAC

It's just another name for the way that we name organic chemical compounds like we learned in lecture.
by Isabelle_Maletz_3E
Sun Dec 02, 2018 1:19 pm
Forum: Naming
Topic: alphabetical order/ charge
Replies: 2
Views: 67

Re: alphabetical order/ charge

I believe since charge consideration wasn't specified, it does not need to be considered and we can just name all of the ligands in alphabetical order.
by Isabelle_Maletz_3E
Sun Nov 25, 2018 4:17 pm
Forum: Hybridization
Topic: Hybridization
Replies: 5
Views: 126

Re: Hybridization

I believe the answer to your question is yes. The angles the hybrid orbitals take match the angles described in the VSEPR theory.
by Isabelle_Maletz_3E
Sun Nov 25, 2018 4:09 pm
Forum: Hybridization
Topic: Bonds
Replies: 2
Views: 78

Re: Bonds

There can be different types of bonds depending on the two atoms that are forming the molecule. For example when a metal and nonmetal are bonded it creates an ionic bond whereas when two nonmetals are bonded it creates a covalent bond. Pi and sigma bonds can apply to either of these and are usually ...
by Isabelle_Maletz_3E
Sun Nov 25, 2018 3:57 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar molecules
Replies: 3
Views: 75

Re: Polar molecules

In most cases a lone pair will cause the entire molecule to be polar. However, if there are enough bonded atoms around the central atom, the polarity will decrease as the surrounding elements make up for the distortion caused by the lone pair.
by Isabelle_Maletz_3E
Sun Nov 18, 2018 11:24 pm
Forum: Dipole Moments
Topic: Dipole moments in hybridization
Replies: 2
Views: 81

Re: Dipole moments in hybridization

Every polar molecule has a dipole moment but there are some molecules that do not have permanent dipole moments. However, applying an external electric field can induce a dipole moment on these molecules.
by Isabelle_Maletz_3E
Sun Nov 18, 2018 11:07 pm
Forum: Resonance Structures
Topic: Bond Length
Replies: 4
Views: 340

Re: Bond Length

In the context of this course, equal bond lengths in resonance structures is something to be aware of but I am pretty sure we do not need to do much more with the information. However, comparing bond lengths can be useful in determining how electronegative the central atom is because of how tightly ...
by Isabelle_Maletz_3E
Sun Nov 18, 2018 10:57 pm
Forum: Lewis Structures
Topic: Expanded Octet
Replies: 8
Views: 197

Re: Expanded Octet

In order to have an expanded octet, the central atom must be in an energy level that would allow this. Therefore only elements that have access to a d-orbital can typically have expanded octets.
by Isabelle_Maletz_3E
Sun Nov 11, 2018 8:20 pm
Forum: Hybridization
Topic: Question 2.43
Replies: 4
Views: 157

Re: Question 2.43

It doesn't matter too much but the main reason is basically to keep the electron configuration in numerical order so 4d would come before 5s.
by Isabelle_Maletz_3E
Sun Nov 11, 2018 8:13 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: bond angles and lone pairs
Replies: 4
Views: 104

Re: bond angles and lone pairs

The Lewis Structure drawing usually comes first which tells you if the central atom is going to have lone pairs. From there you can determine the bond angle.
by Isabelle_Maletz_3E
Sun Nov 11, 2018 8:05 pm
Forum: Hybridization
Topic: How to Determine
Replies: 12
Views: 337

Re: How to Determine

Hybridization is what occurs when the atomic orbitals in the atom (s, p, and sometimes d) overlap consequently creating a larger orbital. This happens when bonds are formed and the electrons of one atom are interacting with those of another. Hybridized orbitals allow for stronger and more stable bon...
by Isabelle_Maletz_3E
Sun Nov 04, 2018 11:40 am
Forum: Lewis Structures
Topic: Central Atom
Replies: 3
Views: 76

Re: Central Atom

Yes, the atom with the lowest ionization energy is the central atom. It is also worth it to note hydrogen will never be the central atom and typically (but not always) the first atom in the formula.
by Isabelle_Maletz_3E
Sun Nov 04, 2018 11:23 am
Forum: Ionic & Covalent Bonds
Topic: Chemical Bonds
Replies: 5
Views: 162

Re: Chemical Bonds

There are a few different ways chemical bonds can form depending on the two atoms that are interacting. If one atom is a metal and the other is a nonmetal then bonding will usually happen when electrons are transferred from the atom with low electronegativity to the atom with higher electronegativit...
by Isabelle_Maletz_3E
Sun Nov 04, 2018 11:07 am
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability for covalent bonds?
Replies: 3
Views: 369

Re: Polarizability for covalent bonds?

Since electrons are being shared in a covalent bond there is a greater amount of polarization happening. However as was stated in class, ionic bonds can have covalent characteristics therefore there is bound to be slight polarity in ionic bonds as well.
by Isabelle_Maletz_3E
Sun Oct 28, 2018 10:05 pm
Forum: Ionic & Covalent Bonds
Topic: bound atoms
Replies: 8
Views: 169

Re: bound atoms

An atom is more stable when it is bonded to another atom because the two are releasing energy either by transferring (ionic) or sharing (covalent) electrons. This action results in the elections being closer to other protons in the nucleus of the other atom and not as close to each other.
by Isabelle_Maletz_3E
Sun Oct 28, 2018 9:53 pm
Forum: Ionic & Covalent Bonds
Topic: the Octet rule
Replies: 21
Views: 431

Re: the Octet rule

The octet rule, which states in covalent bonds the atoms share electrons until a noble gas configuration is reached, is applied to most atoms when drawing a Lewis dot structure. However H, He, Li, and Be are all exceptions in that they do not have to form an octet because they do not have enough val...
by Isabelle_Maletz_3E
Sun Oct 28, 2018 9:32 pm
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 129
Views: 75224

Re: Reading the textbook [ENDORSED]

I find the textbook helpful in completing the homework because it shows step by step how to do problems similar to the chapter questions.
by Isabelle_Maletz_3E
Sun Oct 21, 2018 1:05 am
Forum: Limiting Reactant Calculations
Topic: Limiting Reagent
Replies: 10
Views: 516

Re: Limiting Reagent

You would have to still get the moles of each reactant then calculate the mole ratios. Then you would compare that mole ratio to the one in the balanced chemical equation and find the limiting reactant from there.
by Isabelle_Maletz_3E
Sun Oct 21, 2018 12:58 am
Forum: Balancing Chemical Reactions
Topic: How To....
Replies: 16
Views: 688

Re: How To....

Putting the states of matter in a chemical reaction really only becomes important when dealing with reactions that cause a change in state for one or more chemicals. However, for this class I don't believe it's required unless stated in the question.
by Isabelle_Maletz_3E
Sun Oct 21, 2018 12:52 am
Forum: Student Social/Study Group
Topic: Next week's quiz
Replies: 5
Views: 182

Re: Next week's quiz

It might also be useful to look at the lecture 2 outline on his website. It has a list of homework questions as well as stuff you need to know/ should be able to do by the next test!
by Isabelle_Maletz_3E
Sun Oct 14, 2018 4:39 pm
Forum: SI Units, Unit Conversions
Topic: Sig Figs
Replies: 8
Views: 334

Re: Sig Figs

A couple things to keep in mind when determining how many sig figs are in a given number are: all nonzero digits are significant, leading zeros are not significant and captive zeros are significant. Hope this helps!
by Isabelle_Maletz_3E
Sun Oct 14, 2018 4:13 pm
Forum: SI Units, Unit Conversions
Topic: How does grading for discussion posts work?
Replies: 80
Views: 2583

Re: How does grading for discussion posts work?

The cut off for discussion posts is 11:59 pm on Sunday and I believe there is a software that automatically checks if you've posted at least 3 times that week. I got this information from a friend who asked the TA.
by Isabelle_Maletz_3E
Sun Oct 14, 2018 4:04 pm
Forum: Administrative Questions and Class Announcements
Topic: Number of questions on test one [ENDORSED]
Replies: 39
Views: 17750

Re: Number of questions on test one [ENDORSED]

Test one has 8 questions (some with multiple parts). We are given 40 minutes to complete it and from my experience that was more than enough time. Sig figs are worth 4 points total.
by Isabelle_Maletz_3E
Sun Oct 07, 2018 11:45 pm
Forum: Student Social/Study Group
Topic: HW Schedule?
Replies: 7
Views: 299

Re: HW Schedule?

I believe the homework from now on will be due in section. So yes, week 2 homework is due the day of the next quiz.
by Isabelle_Maletz_3E
Sun Oct 07, 2018 11:39 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7609
Views: 1019898

Re: Post All Chemistry Jokes Here

Q: Why do chemists enjoy working with ammonia?

A: Because it's pretty basic stuff.
by Isabelle_Maletz_3E
Sun Oct 07, 2018 10:27 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 147
Views: 84081

Re: Advice from a Medical Student [ENDORSED]

So nice of you to come back on here to share some advice. I really appreciate it, thanks Ashley!

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