## Search found 62 matches

Sun Jan 17, 2021 10:38 pm
Forum: Equilibrium Constants & Calculating Concentrations
Replies: 10
Views: 26

### Re: ICE Box quadratic equation

So from solving multiple problems, the fault I can see is it is either one answer of x will be negative or one answer will be too large which will result in the concentration total to be negative therefore it would have to be the other.
Sun Jan 17, 2021 10:36 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Reactants and Products
Replies: 9
Views: 31

### Re: Reactants and Products

Yes left side will always be reactants and right side will always be products, even if the reaction goes both ways, it is important to know this as this will be the Kc with those molecules as reactants and products. If flipped Kc would be the inverse or 1/Kc.
Sun Jan 17, 2021 10:33 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling Week 1 #10
Replies: 8
Views: 28

### Re: Sapling Week 1 #10

so basically you're trying to find what the new equilibrium concentration would be if you added 1.0 M of NO2. So with the Kc you found from the original, you would then use icebox to solve what the new concentrations would be with 1.0 M added to NO2. Aka the initial would be 3.28 for NO2 and .463 fo...
Sun Jan 17, 2021 10:29 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: ICE Box
Replies: 28
Views: 74

### Re: ICE Box

I would usually use ICE box to make sure all the steps I made were correct, it really is the most correct way to solve things even if there's something easier. I would use it to check your answer sometimes if you're unsure.
Sun Jan 17, 2021 10:28 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Week 1 Sapling #10
Replies: 6
Views: 43

### Re: Week 1 Sapling #10

so basically what you would do to solve this is using the ICE box, your initial would now be 2.94 for NO2 and 0.335 for N2O4, then you would solve it like the usual ICE box problem you do using the equilibrium constant you found for the first problem. Afterward, you would use the smallest x you solv...
Sun Jan 10, 2021 9:15 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Using "ICE"
Replies: 9
Views: 35

### Re: Using "ICE"

I believe you should always convert to moles, just so you can get the whole picture for the problem and just incase you do need it.
Sun Jan 10, 2021 9:13 pm
Forum: Ideal Gases
Topic: Reviewing PV=NRT
Replies: 7
Views: 55

### Re: Reviewing PV=NRT

You can only find the odd-numbered answers in the back of the book
Sun Jan 10, 2021 9:12 pm
Forum: Ideal Gases
Topic: Units for Pressure
Replies: 41
Views: 814

### Re: Units for Pressure

I believe it is with respect to the problem and what units they give, sometimes it can give mmHg or atm or torr, but take it with a grain of salt, you should ask a TA this question
Sun Jan 10, 2021 9:10 pm
Forum: Ideal Gases
Topic: Units of Temperature
Replies: 82
Views: 287

### Re: Units of Temperature

always has to be in kelvin
Sun Jan 10, 2021 9:07 pm
Forum: Ideal Gases
Topic: PV=nRT and concentration
Replies: 27
Views: 109

### Re: PV=nRT and concentration

because its moles over volume, that is the measurement for molarity, therefore n/V is molarity
Wed Dec 16, 2020 7:36 pm
Forum: Hybridization
Topic: Hybridization and Shape
Replies: 6
Views: 49

### Re: Hybridization and Shape

I wouldn't necessarily base the shape off its hybridization, as hybridization only gives the electron density connections, I would mostly base it off the AXE format, as it allows you to know how many electrons and actual elements its connected to
Wed Dec 16, 2020 7:34 pm
Forum: Naming
Topic: ONO vs. NO2
Replies: 9
Views: 78

### Re: ONO vs. NO2

They're the same, just allows you to draw the lewis dot structure easier
Wed Dec 16, 2020 7:33 pm
Forum: Naming
Topic: K[Cu(en)2 (CN)2 ]
Replies: 7
Views: 60

### Re: K[Cu(en)2 (CN)2 ]

Because it's bonded with a K+, the necessary Cu charge for it to be a non charged compound is Cu(I)
Wed Dec 16, 2020 7:32 pm
Forum: Naming
Topic: Cobalt vs Cobaltate
Replies: 12
Views: 75

### Re: Cobalt vs Cobaltate

there's a charge in the compound therefore it is cobaltate
Wed Dec 16, 2020 7:31 pm
Forum: Bronsted Acids & Bases
Topic: Bronsted vs Lewis Acids and Bases
Replies: 8
Views: 59

### Re: Bronsted vs Lewis Acids and Bases

I believe the lewis theory was based off the bronsted
Wed Dec 16, 2020 7:30 pm
Forum: Student Social/Study Group
Topic: How are you studying?
Replies: 203
Views: 1286

### Re: How are you studying?

I basically went over my notes over a span of two weeks, went from week 1 to week 10 and did problems here and there, what also helped were the review sessions going over specific topics
Wed Dec 16, 2020 7:22 pm
Forum: General Science Questions
Topic: study methods/recs
Replies: 37
Views: 279

### Re: study methods/recs

I recommend going to office hours and going over the past midterms with TA, then doing more textbook problems from the last three weeks
Wed Dec 16, 2020 7:21 pm
Forum: General Science Questions
Topic: bond lengths
Replies: 10
Views: 125

### Re: bond lengths

it's just a coincidence, not necessarily specific, just know that double is shorter than single and triple is shorter than double
Wed Dec 16, 2020 7:20 pm
Forum: General Science Questions
Replies: 7
Views: 53

Cl- is bigger because of the extra electron, that extra electron allows for more push from protons making the atomic radius larger
Wed Dec 16, 2020 7:19 pm
Forum: General Science Questions
Replies: 34
Views: 226

it means if you get a 50% in the class, you will receive a C-, anything below will be a fail
Wed Dec 16, 2020 7:18 pm
Forum: General Science Questions
Topic: final exam
Replies: 9
Views: 111

### Re: final exam

the final was cummulative, it included everything from week 1 to 10 unfortunately
Wed Dec 16, 2020 7:17 pm
Forum: General Science Questions
Topic: curve
Replies: 16
Views: 153

### Re: curve

Sun Dec 06, 2020 10:34 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: HW Question coordination number
Replies: 4
Views: 25

### Re: HW Question coordination number

Co is bonded with 1 SO4 and 5 NH3 compounds, therefore the coordination compound is 6, remember that the number of bonds to the central metal ion determines its coordination number, only counts inside brackets also
Sun Dec 06, 2020 10:29 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Oxidation #
Replies: 6
Views: 43

### Re: Oxidation #

unfortunately you kind of have to memorize the common oxidation numbers in order to find oxidation numbers of others, some I can grab at the top of my head it nitrite (no2-), nitrate (no3-), group elements from group 17 will always be -1, group elements from element 1 will always be +1, and group el...
Sun Dec 06, 2020 10:23 pm
Forum: Naming
Topic: Order of Ligands/naming
Replies: 28
Views: 136

### Re: Order of Ligands/naming

it goes by alphabetical order, and literally by alphabetical order of the ions, so other examples were Co(NH3)3CL3, therefore since ammine is A and chlorine is C, it is first ammine triamminetrichlorocobalt(III)
Sun Dec 06, 2020 10:21 pm
Forum: Naming
Topic: "(en)" Sapling
Replies: 19
Views: 108

### Re: "(en)" Sapling

it is short for ethylenediamine
Sun Dec 06, 2020 10:20 pm
Forum: Naming
Topic: Sapling 1
Replies: 34
Views: 166

### Re: Sapling 1

naming is based on the literal name of the compounds so because ammine is A and Chloride is C, ammine comes first, then chloride
Sun Dec 06, 2020 10:19 pm
Forum: Naming
Topic: Sapling 1
Replies: 9
Views: 56

### Re: Sapling 1

remember that the chlorine is inside the bracket so it is included in the name, it will be triamminetrichlorocobalt(III)
Sun Nov 29, 2020 10:21 pm
Forum: Hybridization
Topic: Sapling #11
Replies: 19
Views: 115

### Re: Sapling #11

Hi, so you have to read the question thoroughly as it asks specifically what is the hybridization of Phosphorus , which then allows you to see then how many bonds and how many lone pairs are connected to the phosphorus, allowing you to then find the hybridization, dont let the picture intimidate you...
Sun Nov 29, 2020 10:16 pm
Forum: Lewis Structures
Topic: Delocalized Pi Bonds
Replies: 3
Views: 56

### Re: Delocalized Pi Bonds

If they can form a resonance structure, they can form delocalized pi bonds
Sun Nov 29, 2020 10:15 pm
Forum: Lewis Structures
Topic: Angles of Bonding Pairs
Replies: 8
Views: 56

### Re: Angles of Bonding Pairs

I think you should know the shapes of the molecules which will allow you to figure out the angles
Sun Nov 29, 2020 10:13 pm
Forum: Lewis Structures
Topic: Hybridization
Replies: 4
Views: 48

### Re: Hybridization

Hi, yes please take a look at table 2F.1 in the book, and it'll help you figure out the hybridization, based off the name of the shape as well as the orbitals
Sun Nov 29, 2020 10:11 pm
Forum: Hybridization
Topic: Sapling #12
Replies: 27
Views: 180

### Re: Sapling #12

Because there is a total of 4 bonds for C, and 2 bonds with O and 2 lone pairs on O, the hybridization is found out to be SP3
Sun Nov 22, 2020 11:48 pm
Forum: Bronsted Acids & Bases
Topic: Strong Vs. Weak Acids and Bases
Replies: 3
Views: 147

### Re: Strong Vs. Weak Acids and Bases

I've stated this earlier, memorize all the strong acids using flashcards, and memorize that all strong bases are OH- molecules .
Sun Nov 22, 2020 11:47 pm
Forum: Bronsted Acids & Bases
Topic: Strong Acids and Bases
Replies: 2
Views: 125

### Re: Strong Acids and Bases

It is recommended to memorize all the strong acids, as if you have seen all strong bases are basically OH- chemicals, it'll shorten the time for you when doing the math.
Sun Nov 22, 2020 11:44 pm
Forum: Bronsted Acids & Bases
Topic: Hydrogen Bonding
Replies: 16
Views: 309

### Re: Hydrogen Bonding

No not at all, one is based on a chemical reaction while the other is based on an intermolecular force, do not get both mixed.
Sun Nov 22, 2020 11:42 pm
Forum: Bronsted Acids & Bases
Topic: Bronsted vs. Lewis Acids/Bases
Replies: 2
Views: 132

### Re: Bronsted vs. Lewis Acids/Bases

From what I remember in High school chem, if this isn't correct please feel free to correct me, the Lewis acid-base was a furthermore specific explanation based on the Bronsted-Lowry explanation on acids and bases, that is why bronsted rules apply to lewis acid/bases but not vice versa.
Sun Nov 22, 2020 11:34 pm
Forum: Bronsted Acids & Bases
Topic: Strong Acids and Bases
Replies: 8
Views: 211

### Re: Strong Acids and Bases

The table can be found in the textbook, cheers
Sun Nov 15, 2020 9:07 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sapling #17: BF3 & NF3
Replies: 3
Views: 35

### Re: Sapling #17: BF3 & NF3

Its because NF3 has a lone pair that contributes to its shape, unlike BF3 where B does not have a lone pair that contributes, therefore making it trigonal planar
Sun Nov 15, 2020 9:04 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sapling #20
Replies: 12
Views: 93

### Re: Sapling #20

H is not bonded to anything highly electronegative aka N, O, or F.
Sun Nov 15, 2020 9:01 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: S and P electrons
Replies: 14
Views: 114

### Re: S and P electrons

because p is farther away from the nucleus (therefore farther away from protons), you need more energy to keep the electrons from leaving the atom, that's how I think of it
Sun Nov 15, 2020 8:59 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: What are orbitals?
Replies: 10
Views: 112

### Re: What are orbitals?

think of orbitals as an electron cloud where you can spot an electron at a specific place at a specific time, not really much to it
Sun Nov 15, 2020 8:52 pm
Forum: Einstein Equation
Topic: Sapling Week 4 #23
Replies: 3
Views: 118

### Re: Sapling Week 4 #23

When 1 mole of atoms is being asked, then you multiply by Avogadro's number, but since only 1 atom is being asked you did not need to multiply
Sun Nov 08, 2020 9:52 pm
Forum: DeBroglie Equation
Topic: Solving for v
Replies: 7
Views: 40

### Re: Solving for v

v= h/(m*lambda)
Sun Nov 08, 2020 9:50 pm
Forum: Einstein Equation
Topic: E=pc vs E=hv
Replies: 15
Views: 149

### Re: E=pc vs E=hv

both find similar answers, it just depends on what is given
Sun Nov 08, 2020 9:48 pm
Forum: Dipole Moments
Topic: Hydrogen bonds
Replies: 9
Views: 207

### Re: Hydrogen bonds

It has to be hydrogen paired with (of course itself), or F, O, or N
Sun Nov 08, 2020 9:46 pm
Forum: Ionic & Covalent Bonds
Topic: Chemical Bonds
Replies: 12
Views: 65

### Re: Chemical Bonds

Double bonds are shorter because there are two bonds pulling on two particles rather than just one, making the bond (combined) stronger than a single
Mon Nov 02, 2020 12:02 am
Forum: DeBroglie Equation
Topic: Sapling Week 2-4 HW Question 24
Replies: 11
Views: 127

### Re: Sapling Week 2-4 HW Question 24

when the wavelength is continuous from when you add the picture again to both sides, it is compatible, but if the wavelength is not continuous when you add the photo of the wave from either side, then it is not compatible
Sun Nov 01, 2020 11:58 pm
Forum: Properties of Light
Topic: Week 2 Homework Sapling #7
Replies: 5
Views: 68

### Re: Week 2 Homework Sapling #7

First find the frequency using the c=lambda times frequency equation, then find the energy when the frequency is found using the E=hv equation, then with the number of grams of ice, multiply it times the enthalpy of fusion; then with the energy found divide the answer multiplied with grams of ice an...
Sun Nov 01, 2020 11:56 pm
Forum: Properties of Light
Topic: Sapling Hw #5
Replies: 5
Views: 67

### Re: Sapling Hw #5

from wavelength find the frequency, then once frequency is found, find energy, using E=hv, then multiply grams of ice by the enthalpy of fusion (per gram), then divide that by the energy you got from E=hv and you should get the answer
Sun Nov 01, 2020 11:53 pm
Forum: Properties of Light
Topic: Sapling #10
Replies: 8
Views: 159

### Re: Sapling #10

divide the mass of flourine by Avagadro's constant then multiply times 2 because it is diatomic and the rest should be smooth sailing
Sun Nov 01, 2020 11:46 pm
Forum: Lewis Acids & Bases
Topic: Water
Replies: 62
Views: 488

### Re: Water

it depends on the problem given, it can act as a base and an acid
Sun Oct 18, 2020 11:15 pm
Forum: Properties of Light
Topic: Photoelectric effect equations
Replies: 4
Views: 51

### Re: Photoelectric effect equations

I would write down what is given and what the question is asking you to find, then I would go on the equation handout and find the equation to use to solve the problem, I would say that is the easiest way.
Sun Oct 18, 2020 11:12 pm
Forum: Student Social/Study Group
Topic: How are you studying?
Replies: 203
Views: 1286

### Re: How are you studying?

To be honest, I believe everything you need to know about the midterm are the questions that is given on the syllabus, I would work through all those questions in order to understand the topic as a whole.
Sun Oct 18, 2020 11:09 pm
Topic: Equation
Replies: 8
Views: 222

### Re: Equation

All equations needed I believe are in a handout that will be given before midterm and such, no equations will be needed to be memorized I believe.
Sun Oct 18, 2020 11:07 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Preference on Scientific Notation
Replies: 13
Views: 159

### Re: Preference on Scientific Notation

writing it does not matter, but usually as I know, it is preferred to use 10^x instead to reduce any confusions and such, though I do know phone calculators use e
Sun Oct 18, 2020 11:05 pm
Forum: Significant Figures
Topic: Sig Figs and Scientific Notation
Replies: 10
Views: 98

### Re: Sig Figs and Scientific Notation

the 10^x does not count, the first part does as 10^x basically means the number of 0s that come afterward
Sun Oct 11, 2020 9:30 pm
Forum: Balancing Chemical Reactions
Topic: Order of Balancing Rxns
Replies: 23
Views: 115

### Re: Order of Balancing Rxns

How I keep on track is basically I write the amount of moles of the certain element on top of it, for example CO2 I put 1 on top of C and 2 on top of O, after labeling all the elements, I check both sides if both sides of the equation have the same amount moles of elements. Then if there are any cha...
Sun Oct 11, 2020 9:27 pm
Forum: Empirical & Molecular Formulas
Topic: Sampling #9
Replies: 7
Views: 66

### Re: Sampling #9

I would start off first with the amount of grams you would get from the combustion formula for both Carbon and Hydrogen. First use the grams of CO2 and work backwords towards C to find the grams of C. Then use the grams of H2O and work backwords to find the grams of H. To get grams of O, take the to...
Sun Oct 11, 2020 9:23 pm
Forum: Molarity, Solutions, Dilutions
Topic: Stuck on Sapling HW
Replies: 14
Views: 199

### Re: Stuck on Sapling HW

First you would like to find out how many moles the total grams have, then conver that to Liters using the molarity given, afterwards then convert Liters to militers and you should be able to get the answer.
Sun Oct 11, 2020 9:22 pm
Forum: Molarity, Solutions, Dilutions
Topic: Sapling HW #6
Replies: 8
Views: 81

### Re: Sapling HW #6

Hi, most likely your molar mass is wrong as the molar mass is 125.55 g
Sun Oct 11, 2020 9:19 pm
Forum: Molarity, Solutions, Dilutions
Topic: Sapling HW Number 7
Replies: 12
Views: 129

### Re: Sapling HW Number 7

Hi there! For number seven you approach it basically as (if 36% is given by mass) 36 g of CaCl2 /100 g of solution!