Search found 101 matches
- Fri Mar 12, 2021 10:57 pm
- Forum: Third Law of Thermodynamics (For a Unique Ground State (W=1): S -> 0 as T -> 0) and Calculations Using Boltzmann Equation for Entropy
- Topic: Units of W
- Replies: 16
- Views: 683
Re: Units of W
I don't think degeneracy has unit.
- Fri Mar 12, 2021 10:56 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: isobaric
- Replies: 20
- Views: 1061
Re: isobaric
isobaric basically means constant pressure for the system.
- Fri Mar 12, 2021 10:56 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: closed and open system better understandable and explaination
- Replies: 6
- Views: 354
Re: closed and open system better understandable and explaination
Open system is when you can add both mass and energy and remove them, whereas a closed system you can not alternate the mass but energy can be added or removed. Isolated is when nothing can be changed.
- Fri Mar 12, 2021 10:54 pm
- Forum: Ideal Gases
- Topic: The difference: ideal gas, ideal condition, ideal behavior
- Replies: 4
- Views: 742
Re: The difference: ideal gas, ideal condition, ideal behavior
It would be determined and based on the behavior of gases in the lower pressures and higher temperatures.
- Fri Mar 12, 2021 10:52 pm
- Forum: Ideal Gases
- Topic: R ideal gas constant
- Replies: 31
- Views: 1869
Re: R ideal gas constant
It is based on the problem and the unit that is given. It would be ideal that the unit would cancel out by the units of R value.
- Sun Mar 07, 2021 10:37 pm
- Forum: General Rate Laws
- Topic: The value, 0.693
- Replies: 4
- Views: 217
Re: The value, 0.693
It is the half life equation for t1/2
- Sun Mar 07, 2021 10:35 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K
- Replies: 33
- Views: 1191
Re: K
Kc is the constant for molar concentration.
- Sun Mar 07, 2021 10:34 pm
- Forum: Ideal Gases
- Topic: Exo vs Endothermic
- Replies: 40
- Views: 2173
Re: Exo vs Endothermic
Typically think of exothermic as forming a bond and endothermic as breaking the bond when applying it to a question.
- Sun Mar 07, 2021 10:33 pm
- Forum: Ideal Gases
- Topic: 5J.13 and Ideal Gas Law
- Replies: 8
- Views: 506
Re: 5J.13 and Ideal Gas Law
You would just look at the difference of the two K value.
- Sun Mar 07, 2021 10:32 pm
- Forum: Ideal Gases
- Topic: gas constant R
- Replies: 18
- Views: 1541
Re: gas constant R
Using the right unit that is given in the question and solving it throughout would be useful.
- Sun Feb 28, 2021 11:05 pm
- Forum: Calculating Standard Reaction Entropies (e.g. , Using Standard Molar Entropies)
- Topic: Molar Entropy
- Replies: 10
- Views: 996
Re: Molar Entropy
I believe it has to do with more atoms and different arrangement of those atoms.
- Sun Feb 28, 2021 11:04 pm
- Forum: Concepts & Calculations Using First Law of Thermodynamics
- Topic: H vs q
- Replies: 20
- Views: 833
Re: H vs q
I believe they would only be the same under constant pressure.
- Sun Feb 28, 2021 11:03 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: work
- Replies: 21
- Views: 832
Re: work
I believe it is the exact opposite to what you have stated in the question.
- Sun Feb 28, 2021 11:02 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: closed system energy change
- Replies: 16
- Views: 706
Re: closed system energy change
No, they would not be the same but it would be quite similar
- Sun Feb 28, 2021 11:02 pm
- Forum: Ideal Gases
- Topic: K and Q
- Replies: 57
- Views: 2997
Re: K and Q
Q would equal to K at equilibrium.
- Sun Feb 21, 2021 11:42 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Solids and Liquids?
- Replies: 26
- Views: 1190
Re: Solids and Liquids?
It would only affect the gases.
- Sun Feb 21, 2021 11:41 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Strong Acids/Bases
- Replies: 19
- Views: 1204
Re: Strong Acids/Bases
Ziyan Peng 3A wrote:This chart attached helped me a lot when I was studying! Hope it helps :)
I think this chart is really helpful!
- Sun Feb 21, 2021 11:39 pm
- Forum: Ideal Gases
- Topic: Ideal Gas vs/ Real Gas
- Replies: 10
- Views: 901
Re: Ideal Gas vs/ Real Gas
I believe we focused more on ideal gas in this class.
- Sun Feb 21, 2021 11:36 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Liquids and Solids in Equilibrium Calculations
- Replies: 12
- Views: 569
Re: Liquids and Solids in Equilibrium Calculations
Yes they are. We often don't focus on them.
- Sun Feb 21, 2021 11:34 pm
- Forum: Ideal Gases
- Topic: Temperature
- Replies: 99
- Views: 5582
Re: Temperature
Yes, it is basically 298K or 25C
- Sun Feb 14, 2021 10:56 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Ka2 << Ka1
- Replies: 12
- Views: 923
Re: Ka2 << Ka1
You are able to ignore Ka2 when the value is way smaller than Ka1.
- Sun Feb 14, 2021 10:56 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Kc vs K
- Replies: 9
- Views: 472
Re: Kc vs K
Kc is the specification for the constant.
- Sun Feb 14, 2021 10:55 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Factors that affect the equilibrium constant
- Replies: 31
- Views: 3880
Re: Factors that affect the equilibrium constant
Temperature would change and affect K
- Sun Feb 14, 2021 10:54 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Telling Apart Weak Bases vs Weak Acids by their Formula
- Replies: 11
- Views: 758
Re: Telling Apart Weak Bases vs Weak Acids by their Formula
I would just memorize the strong acid and bases and that helps a lot.
- Sun Feb 14, 2021 10:54 pm
- Forum: Ideal Gases
- Topic: Chem BL
- Replies: 107
- Views: 6976
Re: Chem BL
I am planning to take it next year instead.
- Sat Feb 06, 2021 10:57 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Acids and Bases
- Replies: 15
- Views: 734
Re: Acids and Bases
I just memorize the ones that are listed in the textbook and they seem to be quite helpful
- Sat Feb 06, 2021 10:56 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: pka vs ka
- Replies: 28
- Views: 1198
Re: pka vs ka
I remember something about it being a smaller value.
- Sat Feb 06, 2021 10:55 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: K vs. Kc
- Replies: 36
- Views: 1183
Re: K vs. Kc
I believe they're relatively the same concept.
- Sat Feb 06, 2021 10:54 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: Strong acids/bases
- Replies: 10
- Views: 513
Re: Strong acids/bases
There was a list that he posted for 14A that was quite helpful.
- Sat Feb 06, 2021 10:53 pm
- Forum: Ideal Gases
- Topic: Kc vs. Kp
- Replies: 71
- Views: 2191
Re: Kc vs. Kp
They are calculated the same way!
- Sun Jan 31, 2021 10:18 pm
- Forum: Calculating Work of Expansion
- Topic: Gas Constant
- Replies: 13
- Views: 767
Re: Gas Constant
I believe the constant we would typically use is the R constant.
- Sun Jan 31, 2021 10:16 pm
- Forum: Ideal Gases
- Topic: Conditions
- Replies: 20
- Views: 1417
Re: Conditions
Kelvin would be 273K whereas atm would be 1 atm
- Sun Jan 31, 2021 10:15 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: External force
- Replies: 6
- Views: 409
Re: External force
I believe external forces are allowed in a reversible reaction.
- Sun Jan 31, 2021 10:13 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Syllabus Problems
- Replies: 6
- Views: 146
Re: Syllabus Problems
I remember him saying it will be some out of order, so we will probably cover the things we don't cover now later.
- Sun Jan 31, 2021 10:12 pm
- Forum: Ideal Gases
- Topic: Reversing Reactions
- Replies: 68
- Views: 2157
Re: Reversing Reactions
it is 1/k
- Sun Jan 24, 2021 10:09 pm
- Forum: Calculating Work of Expansion
- Topic: Integral
- Replies: 9
- Views: 552
Re: Integral
I believe it is because the volume is changing as well.
- Sun Jan 24, 2021 10:08 pm
- Forum: Calculating Work of Expansion
- Topic: Ideal gas
- Replies: 7
- Views: 622
Re: Ideal gas
I believe it is when we can apply the ideal gas law PV=nRT
- Sun Jan 24, 2021 10:07 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Open Systems
- Replies: 15
- Views: 784
Re: Open Systems
I believe you are able to use most equations.
- Sun Jan 24, 2021 10:06 pm
- Forum: Thermodynamic Definitions (isochoric/isometric, isothermal, isobaric)
- Topic: isochoric
- Replies: 10
- Views: 877
Re: isochoric
isochoric is constant volume whereas isometric is having equal dimensions.
- Sun Jan 24, 2021 10:05 pm
- Forum: Thermodynamic Systems (Open, Closed, Isolated)
- Topic: Kelvin or Celsius?
- Replies: 86
- Views: 5008
Re: Kelvin or Celsius?
I believe we are supposed to use the kelvin when solving.
- Sun Jan 17, 2021 10:00 pm
- Forum: Ideal Gases
- Topic: Kp?
- Replies: 30
- Views: 863
Re: Kp?
I believe it is measured for gases.
- Sun Jan 17, 2021 9:56 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: What makes a weak acid?
- Replies: 11
- Views: 252
Re: What makes a weak acid?
I think it is good to remember how to determine strong and weak acids.
- Sun Jan 17, 2021 9:55 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: q vs k
- Replies: 62
- Views: 2319
Re: q vs k
Q is when it is not in equilibrium, and it reaches k when in equilibrium.
- Sun Jan 17, 2021 9:54 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: how to get molarity
- Replies: 8
- Views: 356
Re: how to get molarity
you just have to plug in the numbers, since it's given as molarity already.
- Sun Jan 17, 2021 9:53 pm
- Forum: Ideal Gases
- Topic: reversing reactions
- Replies: 83
- Views: 4711
Re: reversing reactions
it basically changes k > 1/k.
- Sun Jan 10, 2021 10:36 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: H2O
- Replies: 44
- Views: 1828
Re: H2O
You do not include it when its solid or liquid, only include when it is gas.
- Sun Jan 10, 2021 10:35 pm
- Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
- Topic: Pressure and Volume
- Replies: 16
- Views: 703
Re: Pressure and Volume
They're inversely proportional, hence what you explained about one increase would lead to other decrease.
- Sun Jan 10, 2021 10:34 pm
- Forum: Non-Equilibrium Conditions & The Reaction Quotient
- Topic: Effects of temperature
- Replies: 6
- Views: 254
Re: Effects of temperature
I believe right now, we would only need to understand the general concepts and do not need to know how to find the exact.
- Sun Jan 10, 2021 10:33 pm
- Forum: Equilibrium Constants & Calculating Concentrations
- Topic: 5G.1
- Replies: 4
- Views: 194
Re: 5G.1
Yes, in this case, Q would change.
- Sun Jan 10, 2021 10:32 pm
- Forum: Ideal Gases
- Topic: Non-Ideal gases?
- Replies: 26
- Views: 855
Re: Non-Ideal gases?
I don't think we will touch on that topic until later chem courses.
- Thu Dec 17, 2020 2:27 am
- Forum: Sigma & Pi Bonds
- Topic: Pi Bonds
- Replies: 18
- Views: 715
Re: Pi Bonds
It is only applicable to covalent bond
- Thu Dec 17, 2020 2:26 am
- Forum: Ionic & Covalent Bonds
- Topic: Ionic vs Covalent Bonds
- Replies: 9
- Views: 543
Re: Ionic vs Covalent Bonds
When determining if it's a ionic bond or a covalent bond, I would first try to determine the difference in electronegativity.
- Thu Dec 17, 2020 2:26 am
- Forum: Photoelectric Effect
- Topic: Decimals
- Replies: 11
- Views: 589
Re: Decimals
Since it is multiple-choice, it is fine to be sure and keep it at 4 or 5 decimal points depending on the sig figs as well
- Thu Dec 17, 2020 2:24 am
- Forum: Einstein Equation
- Topic: Solving Equations using E=hv
- Replies: 6
- Views: 1118
Re: Solving Equations using E=hv
You would use E=hv to solve and then divide with avogadro's constant
- Thu Dec 17, 2020 2:22 am
- Forum: SI Units, Unit Conversions
- Topic: Avogadro's Number
- Replies: 12
- Views: 2084
Re: Avogadro's Number
You would apply it when going from moles to molecules or atoms.
- Sun Dec 06, 2020 10:22 pm
- Forum: Hybridization
- Topic: Unhybridized orbitals
- Replies: 5
- Views: 238
Re: Unhybridized orbitals
Since the number of electron density regions is equivalent to the amount of hybridized orbitals, whatever's left is unhybridized. For instance, in a compound there's 2 e- density regions which means there's 2 hybridized orbitals, or a sp hybridization. Since the p subshell has 3 orbitals but only 1...
- Sun Dec 06, 2020 10:21 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: polar v nonpolar molecules
- Replies: 30
- Views: 2256
Re: polar v nonpolar molecules
Danielle DIS 3K wrote:How would you differentiate polar and nonpolar molecules?
One of the most common way to differentiate the two is its electronegativity between the bonding molecules.
- Sun Dec 06, 2020 10:18 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Structure Names
- Replies: 5
- Views: 164
Re: Structure Names
I'm guessing I missed this in lecture, but can someone explain why the octahedral structure is called octahedral when it has 6 bonds rather than 8? I am also a bit confused as to how the bipyramidal structures got their names- is it just because they have two 'points'? If someone can explain the lo...
- Sun Dec 06, 2020 10:16 pm
- Forum: SI Units, Unit Conversions
- Topic: How to memorize prefixes
- Replies: 36
- Views: 3314
Re: How to memorize prefixes
samanthaywu wrote:Does anyone have effective strategies for memorizing the prefixes for units? (like mega- kilo- deca- milli-, etc.)
I think quizlet is a good way to learn it and a good alternative to actual flashcards.
- Sun Dec 06, 2020 10:15 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: London Dispersion
- Replies: 33
- Views: 1600
Re: London Dispersion
London dispersion forces are always present between all molecules, and they are the only force that is present in nonpolar molecules. They become stronger in rod-shaped molecules and molecules with atoms that have high polarizability. They are also present when other interactions are occurring. For...
- Sun Nov 29, 2020 10:46 pm
- Forum: Lewis Acids & Bases
- Topic: angle size
- Replies: 11
- Views: 388
Re: angle size
To figure out the angle size you first have to recognize the shape of the molecule by counting how many regions of electron density.Once you determine the shape you can figure out the angle (linear: 180, trigonal planar: 120, tetrahedral:109.5,trigonal bipyramid: 90 and 120, and octahedral: 90) Fro...
- Sun Nov 29, 2020 10:45 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Acids/Bases
- Replies: 7
- Views: 610
Re: Acids/Bases
Lillian wrote:What exactly determines the strength of an acid/base? Didn't really understand if there was a concept that I needed to know for this or there was an equation to determine this.
I believe it has to do with the amount of Hydrogen ion in a compound and its type.
- Sun Nov 29, 2020 10:44 pm
- Forum: Octet Exceptions
- Topic: PCl5 expanded octet question
- Replies: 6
- Views: 862
Re: PCl5 expanded octet question
Daniela Santana 3D wrote:How does the P atom in the PCl5 molecule have an expanded octet? A P atom only has 5 valence electrons so wouldn't it be full by being bonded to 5 Cl atoms? How does the expanded octet concept work?
I believe it has to do with it being in period 3.
- Sun Nov 29, 2020 10:41 pm
- Forum: Ionic & Covalent Bonds
- Topic: Lewis structure
- Replies: 13
- Views: 587
Re: Lewis structure
Joanna Huang wrote:Is there a way to tell which is an ionic and which is a covalent, or even an acid, based off the lewis structure alone? Thank you!
The elements distance can be a factor! where if it's further away from each other it can be ionic and closer be covalent.
- Sun Nov 29, 2020 10:40 pm
- Forum: Electronegativity
- Topic: Be vs Cl
- Replies: 49
- Views: 2594
Re: Be vs Cl
Karina Rodriguez 2H wrote:Beryllium is higher on the periodic table than chlorine, but chlorine is farther right than Be, how do I remember which has higher electronegativity?
This is because Cl is further right, which would allow it to have more electronegativity considering that Be is only one row higher than CL
- Sun Nov 22, 2020 10:30 pm
- Forum: Electronegativity
- Topic: Trick for remembering periodic trends
- Replies: 11
- Views: 3250
Re: Trick for remembering periodic trends
Learned this in highschool and found it to be really helpful for remembering certain trends: Periodic table: across down A ↓ ↑ I ↑ ↓ M ↓ ↑ E ↑ ↓ S -- ↑ A: atomic radius I: ionizing energy M: metallic properties E: electronegativity S: shells This is actually really helpful! Thanks for sharing this ...
- Sun Nov 22, 2020 10:28 pm
- Forum: Electronegativity
- Topic: Electronegativity versus atomic radius
- Replies: 8
- Views: 1089
Re: Electronegativity versus atomic radius
I understand where we apply the principles of electronegativity but how does the trend of atomic radius relate to physical effects on the elements that we can use to study them? It is basically the opposite of each other, where the top right of the periodic table would have the highest electronegat...
- Sun Nov 22, 2020 10:26 pm
- Forum: Octet Exceptions
- Topic: Octet Rule Exceptions
- Replies: 20
- Views: 1227
Re: Octet Rule Exceptions
Yolanda_Xing_3A wrote:I think I saw one YouTube video saying elements after #15, P, can form exceptions of octet rule. And so does the first few elements.
This is very helpful. thank you!
- Sun Nov 22, 2020 10:25 pm
- Forum: Lewis Structures
- Topic: Expanded Valence
- Replies: 11
- Views: 444
Re: Expanded Valence
Emma Ide 2E wrote:Hi, I'm confused about when an atom can have an expanded valence shell. I was adding up the number of valence electrons and then drawing a Lewis structure, but I had 2 electrons left over and was wondering if this was a case of expanded valence?
It revolves with period 3 and p block elements
- Sun Nov 22, 2020 10:24 pm
- Forum: SI Units, Unit Conversions
- Topic: unit conversions
- Replies: 24
- Views: 1078
Re: unit conversions
When converting units do you just multiply by 10^x given number or is there a different way? For example if I convert centi to giga, I multiply the number I'm converting by 10^9 and leave it in scientific notation? I believe leaving it at 10^x would be the best as it would leave it in sig fig alrea...
- Sun Nov 15, 2020 11:29 pm
- Forum: Properties of Light
- Topic: Is c always the speed of light?
- Replies: 92
- Views: 4740
Re: Is c always the speed of light?
Savannah Torella 1L wrote:When using the equation E= hc/ wavelength, is c always going to be the speed of light constant? Are there any instances were c is a different variable?
I think based on this class, it would always be used for speed.
- Sun Nov 15, 2020 11:27 pm
- Forum: Lewis Structures
- Topic: Hydrogen Bonding
- Replies: 12
- Views: 472
Re: Hydrogen Bonding
On a few of the Sapling questions, it mentioned that hydrogen bonding can not occur when the hydrogen atom is bonded to a carbon atom. It can only occur when hydrogen is bonded to either oxygen, fluorine, or nitrogen. I think he went over this in one of his lectures, but I'm still not entirely sure...
- Sun Nov 15, 2020 11:26 pm
- Forum: SI Units, Unit Conversions
- Topic: Modules This Week
- Replies: 9
- Views: 489
Re: Modules This Week
Emma_Barrall_1D wrote:Will there be modules this week posted to his website? They're really helpful!
I would hope he would post more as well! they were very helpful.
- Sun Nov 15, 2020 11:25 pm
- Forum: SI Units, Unit Conversions
- Topic: picometer conversion
- Replies: 13
- Views: 1701
Re: picometer conversion
Does anyone know how to convert m to picometer? In a lot of the problems I see it seems like you just have to move the decimal place over and its usually a 3 digit number. Example 1.5x10^-10 m converts to 150 pm. Is there an actual mathematical way to compute it or is it just moving the decimal pla...
- Sun Nov 15, 2020 11:23 pm
- Forum: SI Units, Unit Conversions
- Topic: Memorizing SI Units
- Replies: 14
- Views: 2359
Re: Memorizing SI Units
Are we expected to memorize SI units? I have some of them memorized, but could not remember what power of 10 a picometer was on the exam. I didn't see SI units given on the exam or on the formulas sheet, so I am guessing we should memorize them? Does anyone have any tricks they use to memorize them...
- Sun Nov 08, 2020 11:35 pm
- Forum: Electronegativity
- Topic: Fluorine
- Replies: 7
- Views: 317
Re: Fluorine
Binyu You wrote:Why does fluorine has the highest electronegativity in all elements of periodic table?
It has to do with its valence electron and that it is highly reactive
- Sun Nov 08, 2020 11:28 pm
- Forum: Ionic & Covalent Bonds
- Topic: Electronegativity
- Replies: 16
- Views: 906
Re: Electronegativity
Siwa Hwang 3G wrote:Why does Fluorine have the highest electronegativity energy?
Fluorine is really highly reactive as it only needs one more electrons.
- Sun Nov 08, 2020 11:27 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Avogadro constant
- Replies: 40
- Views: 2145
Re: Avogadro constant
Savannah Torella 1L wrote:When do you want to use the Avogadro constant? How are you able to tell when it is needed?
It is important to use when converting moles to atoms or vice versa!
- Sun Nov 08, 2020 11:26 pm
- Forum: SI Units, Unit Conversions
- Topic: conversion factors
- Replies: 8
- Views: 379
Re: conversion factors
Hana Sigsbee 3A wrote:are there any specific conversion factors we are expected to know for the midterm that are not basic common knowledge ones?
I think the ones that are on the formula sheets are really important, and also the basic unit conversion like m to cm and etc
- Sun Nov 08, 2020 11:24 pm
- Forum: Balancing Chemical Reactions
- Topic: Balancing Equations Coefficient Question
- Replies: 24
- Views: 2359
Re: Balancing Equations Coefficient Question
Sometimes when I am balancing chemical equations, I end up with coefficients that are not whole numbers. For example, there are 15 mols of O on one side, and on the other side I have to add a coefficient before O2. I can't put 7.5, even though 7.5 * 2 = 15, because I know coefficients have to be wh...
- Sun Nov 01, 2020 11:01 pm
- Forum: Significant Figures
- Topic: When should I start looking at sig figs?
- Replies: 31
- Views: 1321
Re: When should I start looking at sig figs?
Whenever I'm solving a question, how do I know I can start looking at Sig figs. In other words, can I do it during my scratch work when I'm trying to figure out the final answer or do I use all numbers and decimals until I get to the final answer and then I use Sig Figs? I generally use sig fig for...
- Sun Nov 01, 2020 11:00 pm
- Forum: Significant Figures
- Topic: 0's
- Replies: 32
- Views: 1241
Re: 0's
Matlynn Giles 1A wrote:Do the 0's following the decimal place count as SigFigs? For example the 2 0's after the decimal in 20.00.
Yes it does, in this case it would have 4 sig figs
- Sun Nov 01, 2020 10:59 pm
- Forum: Significant Figures
- Topic: Sig Figs and Scientific Notation
- Replies: 10
- Views: 561
Re: Sig Figs and Scientific Notation
Rayna Irving 3H wrote:When considering significant figures in a number, is the (10^x) part also included when using scientific notation or does that part not count?
No, generally only the first part would count!
- Sun Nov 01, 2020 10:48 pm
- Forum: SI Units, Unit Conversions
- Topic: SI Units & US
- Replies: 4
- Views: 187
Re: SI Units & US
noelle_lipschutz_3F wrote:This is a random question that popped into my head while doing SI units. Why hasn’t the US converted to SI units?
I believe that it is relatively difficult to convert now once the U.S has already adapted to the system we're using for awhile
- Sun Nov 01, 2020 10:47 pm
- Forum: SI Units, Unit Conversions
- Topic: SI Unit for Mass
- Replies: 10
- Views: 606
Re: SI Unit for Mass
Out of all the equations we've used so far in units 1 and 2, should mass always be in kg? I've been using g for mass for most of my work, but I noticed while reviewing the De Broglie equation that mass needs to be converted into kg for this example. Do some equations require mass in kg while some u...
- Sun Oct 25, 2020 11:33 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Solute vs Solvent
- Replies: 6
- Views: 590
Re: Solute vs Solvent
Hi! What makes something a solvent or a solute? How can we just know? I know that solutes are dissolved in solvents to create a solution such as salt and water, respectively. However, if given two items, how would I know? What makes something soluble I guess? Basically, the solvent is the substance...
- Sun Oct 25, 2020 11:29 pm
- Forum: Ionic & Covalent Bonds
- Topic: Covalent Bonds
- Replies: 9
- Views: 304
Re: Covalent Bonds
America Ramirez 3H wrote:How can you determine which one is stronger, out of ionic, covalent and hydrogen?
Hydrogen is the weakest out of the three, and I believe covalent and Ionic are both strong depending on its environment
- Sun Oct 25, 2020 11:29 pm
- Forum: Ionic & Covalent Bonds
- Topic: Strength of bonds
- Replies: 13
- Views: 548
Re: Strength of bonds
Queena Chu 1I wrote:What is the strength of types of bonds from highest to lowest?
I've learned that covalent bond is the strongest bond when compared to ionic but I also remember that in certain stances, an ionic bond may be very strong as well
- Sun Oct 25, 2020 11:25 pm
- Forum: Limiting Reactant Calculations
- Topic: Midterm
- Replies: 7
- Views: 324
Re: Midterm
On the midterm will the questions be like those in the textbook where it will ask for the balanced chemical equation when aluminum metal reacts with chlorine gas to produce aluminum chloride? Will we be expected to know that Chlorine gas is Cl2 or know what aluminum chloride looks like? Or will we ...
- Sun Oct 25, 2020 11:24 pm
- Forum: Balancing Chemical Reactions
- Topic: States of matter in chem equations
- Replies: 13
- Views: 864
Re: States of matter in chem equations
Hello, When we have to balance chem equations do we have to include the states of matter in all components. Additionally how do we know what state of matter a reactant/product is in? I believe it would be better to include the state of matter as it quite often appears together while balancing an eq...
- Sun Oct 18, 2020 11:35 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Molarity test question
- Replies: 8
- Views: 199
Re: Molarity test question
On the midterms or even the exams when expected to find molarity, will we be required to know how to substitute for any of the missing factors using the equation MfinalVfinal/Mnitial for example if we were finding the Vintial or will it always be the same factor we are finding? I am also wondering ...
- Sun Oct 18, 2020 11:30 pm
- Forum: Ionic & Covalent Bonds
- Topic: Nonpolar and polar
- Replies: 16
- Views: 1027
Re: Nonpolar and polar
Jessica Tejero 3L wrote:Whats the easiest ways to tell whether a molecule is polar or non-polar?
I believe it is based on the electronegativity of the molecules
- Sun Oct 18, 2020 11:26 pm
- Forum: Ionic & Covalent Bonds
- Topic: Is ionic or covalent stronger?
- Replies: 31
- Views: 15146
Re: Is ionic or covalent stronger?
I've found conflicting answers on the internet so I wanted to ask here. I was always taught throughout high school that covalent bonds are stronger than ionic bonds. But I came across a question in the textbook asking which of two substances would have a higher boiling point and I know that it has ...
- Sun Oct 18, 2020 11:24 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Calculating number of moles of an element
- Replies: 10
- Views: 361
Re: Calculating number of moles of an element
When calculating the number of moles of an element we always use 100g. I was wondering if we use 100g just for semplicity, and if there is any particular case where we should consider different quantities. I believe it is cause 100g is much easier for simplification, and also it was one of the thin...
- Sun Oct 18, 2020 11:22 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Built-in webcams/Equipment request [ENDORSED]
- Replies: 22
- Views: 1403
Re: Built-in webcams/Equipment request [ENDORSED]
Is there confirmation that webcams must be external? I'm getting a lot of mixed answers on whether built in cameras are allowed or not and if it's mandatory to have an external webcam and the equipment request instructs do not specify that. Are the webcams from the form only available to pick up in...
- Sun Oct 11, 2020 9:12 pm
- Forum: Significant Figures
- Topic: When to use Sig Figs
- Replies: 8
- Views: 163
Re: When to use Sig Figs
Normally I would just follow the trend of the problem, where if it uses scientific notation, then I would follow and use scientific notation and if it does not I would leave it as a regular number with right sig fig.
- Sun Oct 11, 2020 9:07 pm
- Forum: SI Units, Unit Conversions
- Topic: Rounding
- Replies: 20
- Views: 547
Re: Rounding
Are we suppose to always round to maintain the same sig figs?
- Sun Oct 11, 2020 9:05 pm
- Forum: Significant Figures
- Topic: Sapling HW #4
- Replies: 31
- Views: 1726
Re: Sapling HW #4
Hi guys! I was doing question #4 on the homework and got a little confused on the sig figs. Would someone mind explaining why 950000 only has 2 sig figs compared 80060 having 4 sig figs. Initially I thought 950000 and 80060 would both only have 3 sig figs I believe this revolves with leading zeroes...
- Sun Oct 11, 2020 9:04 pm
- Forum: Balancing Chemical Reactions
- Topic: Molar Mass
- Replies: 23
- Views: 1781
Re: Molar Mass
When a question requires us to calculate anything that needs molar masses, should we use the molar mass on the periodic tables that we have? e.g H- 1.00794 (6 sig figs) Is there a specific amount of sig figs we should use or it just depends on the periodic table given? I believe the specific amount...
- Sun Oct 11, 2020 9:02 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Calculating Molar Mass (Sapling Week 1 #10)
- Replies: 6
- Views: 186
Re: Calculating Molar Mass (Sapling Week 1 #10)
Were we supposed to look up the molar masses for this specific problem? I did not quite understand how to figure it.