Search found 38 matches

by Michelle Ramirez_4A
Tue Feb 12, 2019 2:34 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: Example 8.3 sixth edition
Replies: 3
Views: 8

Example 8.3 sixth edition

In the sixth edition textbook the example problem for specific heat and molar heat states that the temperature changes from 20C to 100C. In their work however they treated the deltaT as 80.K. My question is why they didn't convert 80C to 353K?
by Michelle Ramirez_4A
Tue Feb 12, 2019 2:29 pm
Forum: Heat Capacities, Calorimeters & Calorimetry Calculations
Topic: q=mCdeltaT
Replies: 4
Views: 26

Re: q=mCdeltaT

If you are given moles then use n and molar heat capacity, nad if you are given mass (g) then use m and specific heat capacity of the substance.
by Michelle Ramirez_4A
Sun Feb 10, 2019 3:43 pm
Forum: Thermodynamic Systems (Open, Closed, Isolated)
Topic: Clarifying about Midterm
Replies: 4
Views: 18

Re: Clarifying about Midterm

I would say that it is only focused on the topics covered in class and if you are using the textbook to only focus on the section of the chapters that come before the Gibbs Free energy section. In the case of the 6th edition it would be to only go up to section 9.11 from Chapter 9.
by Michelle Ramirez_4A
Sun Feb 10, 2019 3:39 pm
Forum: Entropy Changes Due to Changes in Volume and Temperature
Topic: Converting Celsius to Kelvin
Replies: 7
Views: 28

Re: Converting Celsius to Kelvin

In the examples we have done in class we have added 273K.
by Michelle Ramirez_4A
Sun Feb 10, 2019 3:38 pm
Forum: Ideal Gases
Topic: pH and pOH
Replies: 17
Views: 88

Re: pH and pOH

Usually the problem you are solving will tell you which one to solve for. In some occasions you may have to solve for both for the same problem.
by Michelle Ramirez_4A
Fri Dec 07, 2018 8:30 pm
Forum: Lewis Structures
Topic: Lone electrons and polarity
Replies: 1
Views: 26

Re: Lone electrons and polarity

I don't think that lone pairs affect the polarity of an atom. Instead its electronegativity and the atomic radius would affect how likely it would be able for its electron cloud to be distorted.
by Michelle Ramirez_4A
Fri Dec 07, 2018 8:28 pm
Forum: Naming
Topic: Naming
Replies: 3
Views: 40

Re: Naming

You have to see what the charge would be on the compound to figure out how many potassium molecules would neitralize that charge.
by Michelle Ramirez_4A
Fri Dec 07, 2018 8:20 pm
Forum: General Science Questions
Topic: what specifically makes thymine a base.
Replies: 2
Views: 57

Re: what specifically makes thymine a base.

Following the answer above, the nitrogen would make the thymine the base because it has a lone pair electrons.
by Michelle Ramirez_4A
Fri Dec 07, 2018 8:16 pm
Forum: Lewis Acids & Bases
Topic: Why is water always a lewis base?
Replies: 2
Views: 25

Re: Why is water always a lewis base?

It depends on the reaction because water is considered to be amphoteric meaning it can be an acid or base.
by Michelle Ramirez_4A
Fri Dec 07, 2018 8:15 pm
Forum: General Science Questions
Topic: PH3 or NH3
Replies: 2
Views: 39

Re: PH3 or NH3

NH3 would have a higher boiling point because the nitrogen forms bonds with H. Remember that for intermolecular forces it goes from Van der Waals, dipole-dipole to H-binding as the strongest.
by Michelle Ramirez_4A
Fri Dec 07, 2018 8:13 pm
Forum: Amphoteric Compounds
Topic: What makes something amphoteric?
Replies: 6
Views: 41

Re: What makes something amphoteric?

H2O is amphoteric because it can be an acid or base. This means is can either accept an electron or donate an electron.
by Michelle Ramirez_4A
Fri Dec 07, 2018 8:11 pm
Forum: General Science Questions
Topic: what determines boiling point
Replies: 2
Views: 43

Re: what determines boiling point

Boiling point from least to greatest is Van der Walls, dipole-dipole and H-bonds.What helps determine boiling point can also be the size of the molecule because the bigger the molecule, the more London forces which also leads to a higher boiling point.
by Michelle Ramirez_4A
Fri Dec 07, 2018 8:09 pm
Forum: General Science Questions
Topic: Finals
Replies: 4
Views: 61

Re: Finals

All topics will be covered in the syllabus, so you should be able to understand quantum as equally as the other topics.
by Michelle Ramirez_4A
Fri Dec 07, 2018 8:08 pm
Forum: General Science Questions
Topic: amphiprotic
Replies: 3
Views: 37

Re: amphiprotic

Amphiprotic is when the compound can either donate or accept a hydrogen.
by Michelle Ramirez_4A
Fri Dec 07, 2018 8:06 pm
Forum: Administrative Questions and Class Announcements
Topic: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
Replies: 118
Views: 3571

Re: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]

Can someone explain why hemogrlobin is tetradentrate but cisplatin is monodentrate?
by Michelle Ramirez_4A
Thu Dec 06, 2018 8:25 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: How to tell if something is a chelate
Replies: 6
Views: 50

Re: How to tell if something is a chelate

I think that a chelate is when the ring structured compound binds a central metal at two or more places.
by Michelle Ramirez_4A
Thu Dec 06, 2018 8:20 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: pH calculation
Replies: 4
Views: 40

pH calculation

When we are loking for pH why is pH= log10[H30]? How do we know what the value of [H3O] is?
by Michelle Ramirez_4A
Tue Dec 04, 2018 11:01 pm
Forum: Biological Examples
Topic: Ligands
Replies: 6
Views: 49

Ligands

When given a chemical formula how do we know which one is the cetral metal atom or ion?
by Michelle Ramirez_4A
Tue Dec 04, 2018 9:51 pm
Forum: Lewis Structures
Topic: Lewis Structure bonds
Replies: 3
Views: 29

Re: Lewis Structure bonds

So to make sure we have the correct Lewis structure we calculate the formal charge of the possible structures we have drawn?
by Michelle Ramirez_4A
Tue Dec 04, 2018 9:47 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs
Replies: 11
Views: 73

Re: Lone Pairs

Lone pairs affect the structure of the VSEPR model beacues they have the highest repulsion so they try to be fathest apart from each other. Also they cause repulsion with the other atoms bonded with the central atom which is why the angles of some shapes turn out to be slightly smaller than the orig...
by Michelle Ramirez_4A
Tue Dec 04, 2018 9:43 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone Pairs
Replies: 11
Views: 73

Re: Lone Pairs

Arlene Linares 3A wrote:Can someone explain lone pairs to me?
Lone pairs are the pair of electrons that do not get shared with another atom in the molecule.
by Michelle Ramirez_4A
Tue Dec 04, 2018 9:36 pm
Forum: General Science Questions
Topic: Can We Take The Final In Pencil?
Replies: 8
Views: 112

Re: Can We Take The Final In Pencil?

I think you are only allowed to write the tests in pen. Atleast for the midterm they mentioned that only what was written in pen would be graded. This seems reasonable to since we receive our tests back after they are graded and things written in pencil can easily be erased.
by Michelle Ramirez_4A
Tue Dec 04, 2018 9:31 pm
Forum: Lewis Structures
Topic: Lewis Structure bonds
Replies: 3
Views: 29

Lewis Structure bonds

How do you know when. you need to form a double bond or if the bond between the atoms must stay as single bonds?
by Michelle Ramirez_4A
Tue Dec 04, 2018 9:28 pm
Forum: Sigma & Pi Bonds
Topic: Number of sigma and pi bonds
Replies: 5
Views: 62

Re: Number of sigma and pi bonds

You would still have to draw the Lewis structure ( with help of the hybridization) to see whether the bonds are single, double and triple bonds. Once you know the structure the number of sigma bonds are the number of. single bonds and the pi bonds are any bonds starting from the second bond. This me...
by Michelle Ramirez_4A
Thu Nov 29, 2018 12:16 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 1
Views: 14

Bond Angles

When we are considering the bond angles, for molecules with lone pairs do we consider the bond lengths of the electron arrangement or of the molecular shape?
by Michelle Ramirez_4A
Wed Nov 28, 2018 4:20 pm
Forum: Electronegativity
Topic: Ionic Character
Replies: 5
Views: 50

Re: Ionic Character

Electronegativity decreases down a group since Cl is lower than O, I want to.say that O is more electronegative than Cl.
by Michelle Ramirez_4A
Wed Nov 28, 2018 4:14 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Seesaw Bond Angles
Replies: 6
Views: 4322

Re: Seesaw Bond Angles

The lone pair is placed on the axis of the molecule. This is the Axail lone pair and it is placed in this position because of the repulsion of the atoms from the electron pair.
by Michelle Ramirez_4A
Wed Nov 28, 2018 4:10 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar and Non-Polar
Replies: 2
Views: 21

Polar and Non-Polar

When we are trying to answer whether a molecule is polar or non polar how do we determine the direction of the bond?
by Michelle Ramirez_4A
Wed Nov 28, 2018 4:09 pm
Forum: Hybridization
Topic: Polar Power
Replies: 5
Views: 46

Re: Polar Power

The atomic radii helps you understand why the polarizing power increases or decreases since the size of the radius correlates with how much power the nucleus has on the valence electrons.
by Michelle Ramirez_4A
Wed Nov 28, 2018 4:06 pm
Forum: Lewis Structures
Topic: Lewis structures vs VSEPR
Replies: 2
Views: 39

Re: Lewis structures vs VSEPR

For VSEPR since the central atom is the "important atom" we only focus on the shared electron it has with the other atoms. Because of this it is not necessary to dram the valence electrons of the other atoms.
by Michelle Ramirez_4A
Sat Nov 03, 2018 9:19 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum number Ms
Replies: 3
Views: 73

Quantum number Ms

How do we know when the Ms quantum number should be -1/2, or 1/2?
by Michelle Ramirez_4A
Thu Oct 25, 2018 5:37 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum numbers
Replies: 3
Views: 90

Quantum numbers

What is the difference between principal quantum number and magnetic quantum number?
by Michelle Ramirez_4A
Thu Oct 25, 2018 5:35 pm
Forum: Photoelectric Effect
Topic: unit conversion hw Q 1.3
Replies: 2
Views: 84

Re: unit conversion hw Q 1.3

You should convert the given values to the required SI units before plugging them into the equation you are using (like e=hv etc) that way when you are solving the problem you are able to "cross out" the units that you don't need in your final answer. At the end, if they are asking for a c...
by Michelle Ramirez_4A
Thu Oct 25, 2018 5:29 pm
Forum: Administrative Questions and Class Announcements
Topic: Constants and Equations
Replies: 2
Views: 83

Re: Constants and Equations

The front page of every exam should gave the general equations and constants that you will need.
by Michelle Ramirez_4A
Thu Oct 04, 2018 7:22 pm
Forum: Significant Figures
Topic: Determining Sig Figs
Replies: 6
Views: 57

Re: Determining Sig Figs

You may also want to refer to Dr. Lavelle's "Math Assistance" section where he has two documents that goes over the use of significant figures thoroughly!
by Michelle Ramirez_4A
Thu Oct 04, 2018 7:19 pm
Forum: Significant Figures
Topic: Determining Sig Figs
Replies: 6
Views: 57

Re: Determining Sig Figs

When you are multiplying you must use the smallest number of significant figures in your data to be the number of significant figures in your answer. For example, if you are multiplying 6.18165 x 3.56=22.0 your answer must only have 3 significant figures since that is the smallest number of signific...
by Michelle Ramirez_4A
Thu Oct 04, 2018 7:13 pm
Forum: Balancing Chemical Reactions
Topic: Net number of molecules
Replies: 3
Views: 71

Re: Net number of molecules

The net number of molecules would be the difference between the number of moles produced minus the number of moles you began with. You will know the number of moles of your reactants and products by adding the given coefficients in front of their respective molecules form the reaction. (Make sure yo...
by Michelle Ramirez_4A
Thu Oct 04, 2018 7:06 pm
Forum: SI Units, Unit Conversions
Topic: How does grading for discussion posts work?
Replies: 73
Views: 1298

Re: How does grading for discussion posts work?

Raquel Rodriguez wrote:Do you guys know when our first test is?

It would be during your discussion section in week 2.

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