Can someone please explain Churro #34?
Grace sees her crush and panics, accidentally dropping 382.7 mg of HCl and 147.1 mg CaO into a 1L flask. After filling that flask with water up to the 1L mark, what is the pH of the resulting solution?
I don't know where to start.
Search found 45 matches
- Sat Dec 08, 2018 8:26 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Churro #34
- Replies: 1
- Views: 251
- Sat Dec 08, 2018 7:34 pm
- Forum: Naming
- Topic: Polarizability
- Replies: 2
- Views: 423
Re: Polarizability
Polarizing Power- The smaller and more highly charged, the higher polarizing power it has
Polarizability- The bigger it is and more electrons it has, the more polarizable it is
Polarizability- The bigger it is and more electrons it has, the more polarizable it is
- Sat Dec 08, 2018 7:31 pm
- Forum: Photoelectric Effect
- Topic: work function
- Replies: 4
- Views: 847
Re: work function
This is not possible. Please provide the question you're referring to; that might help to explain.
- Sat Dec 08, 2018 7:30 pm
- Forum: Calculating the pH of Salt Solutions
- Topic: pH of acids
- Replies: 13
- Views: 3491
Re: pH of acids
https://upload.wikimedia.org/wikipedia/ ... ale-01.jpg
Take a a look at this scale. The lower the PH, the more acidic it is. Thus, the stronger the acid, the lower its PH.
Take a a look at this scale. The lower the PH, the more acidic it is. Thus, the stronger the acid, the lower its PH.
- Sat Dec 08, 2018 7:28 pm
- Forum: Trends in The Periodic Table
- Topic: atomic radius
- Replies: 2
- Views: 571
Re: atomic radius
Yes. Most importantly, you need to know that it is indicative of an atom's size. The greater the atomic radius, the bigger the atom.
- Sat Dec 08, 2018 7:26 pm
- Forum: Properties of Light
- Topic: Frequency
- Replies: 1
- Views: 547
Re: Frequency
Frequency is the number of times a point on a wave passes a fixed reference point in one second (remember waves oscillate). All you need to know is the frequency is measured in Hz (Hertz)
- Sat Dec 08, 2018 7:24 pm
- Forum: Properties of Light
- Topic: limiting reagents
- Replies: 4
- Views: 901
Re: limiting reagents
You determine limiting reactant by seeing which reactant will run out first in a reaction. Thus, you can figure this out by finding the mass of product each reactant produces. Whichever produces less of the product will therefore be the limiting reactant. Percent yield= actual yield/theoretical yiel...
- Sat Dec 08, 2018 7:22 pm
- Forum: Trends in The Periodic Table
- Topic: electronegativity
- Replies: 10
- Views: 3266
Re: electronegativity
Electronegativity is the tendency of an atom to attract a shared pair of electrons towards itself. It increases across and decreases down the periodic table.
- Sat Dec 08, 2018 3:57 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Acids and Bases
- Replies: 5
- Views: 835
Acids and Bases
Can someone summarize the key things we should know about acids and bases for the final?
- Thu Dec 06, 2018 5:43 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 forces
- Replies: 1
- Views: 314
Re: London dispersion forces
Did you get marked off specifically for that? There is London Dispersion forces on between all molecules so that does not make sense..
- Thu Nov 29, 2018 2:18 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 7th edition 2E.1 mistake ?
- Replies: 6
- Views: 741
Re: 7th edition 2E.1 mistake ?
If you look at AX2E3 in Figure 2E. 7 on page 113 you will see that it is possible to have a linear structure with 3 lone pairs.
- Thu Nov 29, 2018 2:16 pm
- Forum: Polarisability of Anions, The Polarizing Power of Cations
- Topic: 2D.9 vs 2D.11 in 7th edition
- Replies: 1
- Views: 250
Re: 2D.9 vs 2D.11 in 7th edition
Yes there is a difference. Cations have high polarizing power if they are small and highly charged because they have a higher ability to distort e- cloud of the anion because their positive center pulls in the electrons from the anion. On the other hand, anions polarizability increases with their si...
- Wed Nov 28, 2018 6:11 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: So does the dipole moment point to the partial positive charge or the partial negative charge?
- Replies: 2
- Views: 427
Re: So does the dipole moment point to the partial positive charge or the partial negative charge?
Also curious, posting to follow thread.
- Sun Nov 25, 2018 9:32 pm
- Forum: Hybridization
- Topic: promoted hybridization
- Replies: 4
- Views: 413
Re: promoted hybridization
505095793 wrote:What does it mean when an electron is promoted? Also, what effect does electron promotion play on the overall molecule or atom?
I don't think this is something we need to know as Dr. Lavelle has not covered this topic in class.
- Sun Nov 25, 2018 9:29 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Test 3
- Replies: 38
- Views: 2485
Re: Test 3
Hanlin Zhu 4G wrote:I think different intermolecular interactions is also included in the test.
Can you elaborate on this?
- Sun Nov 25, 2018 9:27 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Test
- Replies: 5
- Views: 642
Re: Test
I would think the test would cover everything after the midterm up until hybridization.
- Sun Nov 18, 2018 6:46 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Grades
- Replies: 7
- Views: 828
Re: Grades
It was also mentioned in a previous post that there might be a 3-5 percent curve based on class average.
- Thu Nov 15, 2018 7:42 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: VSEPR model
- Replies: 3
- Views: 372
Re: VSEPR model
Because the bonds are still within the same region and repel other regions of electrons.
- Thu Nov 15, 2018 7:40 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Thanksgiving [ENDORSED]
- Replies: 14
- Views: 1497
Re: Thanksgiving [ENDORSED]
I'm pretty sure we won't have lecture as long as people don't ask too many questions during the lectures leading up to it! :)
- Thu Nov 15, 2018 7:37 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Discussion posts grading (Anyone have a grade for this yet?)
- Replies: 3
- Views: 480
Re: Discussion posts grading (Anyone have a grade for this yet?)
I think this is something they may end up posting in the end. As long as you are doing 3 posts a week, you shouldn't be worried.
- Sun Nov 11, 2018 5:06 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: Dipole Moment
- Replies: 2
- Views: 341
Re: Dipole Moment
Dipole moments occur when there is a separation of charge. They can occur between two ions in an ionic bond or between atoms in a covalent bond; dipole moments arise from differences in electronegativity. The larger the difference in electronegativity, the larger the dipole moment. The distance betw...
- Sun Nov 11, 2018 5:05 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: Intermolecular Forces
- Replies: 4
- Views: 399
Re: Intermolecular Forces
I thought these are both names, in addition to some others, for the same forces--and therefore the same strength. I'm not 100 percent sure. Anyone know for sure?
- Sun Nov 11, 2018 5:02 pm
- Forum: Lewis Structures
- Topic: Expanded Octets
- Replies: 9
- Views: 2785
Re: Expanded Octets
Any element that has or can have a d orbital (aka period 3 and beyond)
- Sun Nov 11, 2018 4:58 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Homework Due Week 7
- Replies: 10
- Views: 1169
Re: Homework Due Week 7
I think we do recent homework as prep for whatever test is coming up; so, I think outline 3 would be fine.
- Sun Nov 04, 2018 10:17 pm
- Forum: SI Units, Unit Conversions
- Topic: Review Session Notes
- Replies: 3
- Views: 661
Re: Review Session Notes
This is great practice :)
- Sun Nov 04, 2018 10:06 pm
- Forum: Ionic & Covalent Bonds
- Topic: Chem Midterm
- Replies: 13
- Views: 1088
Re: Chem Midterm
Celine Hoh 4H wrote:Do we need a blue book for the test?
No need for a blue book!
- Sat Nov 03, 2018 8:53 pm
- Forum: Properties of Electrons
- Topic: How do we determine the possible number of electrons when given ml?
- Replies: 4
- Views: 813
Re: How do we determine the possible number of electrons when given ml?
ml specifies a specific orbital. The D subshell itself has 5 orbitals (ml= -2, -1, 0, +1, +2) and therefore two electrons in each (10 total). However, the ml= -2 specifies that it is one of these 5 orbitals, which can only contain two electrons. Can you further explain this? Still confused. Sure! T...
- Sat Nov 03, 2018 1:07 pm
- Forum: General Science Questions
- Topic: Schrodinger
- Replies: 2
- Views: 325
Re: Schrodinger
I think that if it is in any way on the midterm, it will be conceptual.
- Sat Nov 03, 2018 1:06 pm
- Forum: Properties of Electrons
- Topic: How do we determine the possible number of electrons when given ml?
- Replies: 4
- Views: 813
Re: How do we determine the possible number of electrons when given ml?
ml specifies a specific orbital. The D subshell itself has 5 orbitals (ml= -2, -1, 0, +1, +2) and therefore two electrons in each (10 total). However, the ml= -2 specifies that it is one of these 5 orbitals, which can only contain two electrons.
- Fri Nov 02, 2018 8:14 pm
- Forum: Ionic & Covalent Bonds
- Topic: Midterm study
- Replies: 7
- Views: 818
Re: Midterm study
Chloe Orsini 1K wrote:I was thinking of doing a massive group me! We can use it to get together and study or ask questions and stuff like that! I could make one and add y'all and then you guys could add your friends who are interested too, does this work?
Sounds great!
- Wed Oct 31, 2018 7:31 pm
- Forum: Ionic & Covalent Bonds
- Topic: Midterm study
- Replies: 7
- Views: 818
Re: Midterm study
Also down:) My name is Sona Hakobyan
- Thu Oct 25, 2018 9:42 am
- Forum: Administrative Questions and Class Announcements
- Topic: HW for this week [ENDORSED]
- Replies: 4
- Views: 522
Re: HW for this week [ENDORSED]
Anyone know the answer? I am also curious.
- Wed Oct 24, 2018 5:13 pm
- Forum: Properties of Electrons
- Topic: spectroscopy
- Replies: 1
- Views: 352
Re: spectroscopy
This describes it in depth: "It’s the energy level. With spectroscopy you are measuring how energy is absorbed, emitted, and or reflected. In molecular spectroscopy you are looking at interactions with bonding electrons in the outer valence shell. The interactions change according to the struct...
- Wed Oct 24, 2018 4:24 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Online Modules
- Replies: 4
- Views: 320
Re: Online Modules
taline_n wrote:I asked a UA and she said that no more online modules will be posted for the rest of the quarter.
Did she/he say why?
- Wed Oct 24, 2018 4:19 pm
- Forum: Properties of Light
- Topic: Quantum Test
- Replies: 11
- Views: 1199
Quantum Test
Hi all,
I seem to be having a lot of trouble with the quantum section. It is always very confusing to be as to which equations I should be using and when? Is there any sources you guys can provide that you think helped you for the test?
I seem to be having a lot of trouble with the quantum section. It is always very confusing to be as to which equations I should be using and when? Is there any sources you guys can provide that you think helped you for the test?
- Fri Oct 19, 2018 10:36 am
- Forum: DeBroglie Equation
- Topic: 6th HW 1.23 What is KeV?
- Replies: 5
- Views: 1416
Re: 6th HW 1.23 What is KeV?
You need to know the following equations and conversions:
KeV = kilo-electric volt (multiply quantity by 1000)
1.602 x 10^-19 J = 1 eV
E = hc/lambda
KeV = kilo-electric volt (multiply quantity by 1000)
1.602 x 10^-19 J = 1 eV
E = hc/lambda
- Fri Oct 19, 2018 10:30 am
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Problem 1D.9
- Replies: 3
- Views: 382
Re: Problem 1D.9
Someone correct me if I'm wrong, but I believe if he doesn't cover it in class or his video modules, then we don't need to know it.
- Fri Oct 19, 2018 10:27 am
- Forum: Administrative Questions and Class Announcements
- Topic: Test Average
- Replies: 4
- Views: 403
Test Average
Does anyone know what the test average for the first test was?
- Sun Oct 14, 2018 9:46 pm
- Forum: Student Social/Study Group
- Topic: Note Taking
- Replies: 145
- Views: 15059
Re: Note Taking
For me the most effective way is using google docs because when I hand write notes I cannot read my writing. However, for graphs and other pictures I like to draw them in my notebook and label them as figures in my notes. I do believe that if I had better handwriting, hand writing my notes would be ...
- Sun Oct 14, 2018 9:43 pm
- Forum: Properties of Light
- Topic: Test 2
- Replies: 17
- Views: 1209
Re: Test 2
Everything regarding test 2 should be on outline 2 :)
- Wed Oct 10, 2018 8:43 pm
- Forum: Limiting Reactant Calculations
- Topic: Test 1
- Replies: 8
- Views: 1109
Test 1
For those who have taken the test, do you think the difficulty is the same level as the homework and modules? In other words, would studying these two be sufficient to do well on the exam? If you have any sources that helped you be better prepared, please let me know !
- Fri Oct 05, 2018 3:28 am
- Forum: Empirical & Molecular Formulas
- Topic: Empirical Formula (HW problem F.11, part a)
- Replies: 2
- Views: 245
Re: Empirical Formula (HW problem F.11, part a)
Yes it is safe to round up these numbers. I've heard that the numbers have to be within 5 percent of the next closest integer to be rounded. .
- Fri Oct 05, 2018 3:23 am
- Forum: Limiting Reactant Calculations
- Topic: multiple limiting reactants
- Replies: 9
- Views: 831
Re: multiple limiting reactants
This would not be likely because if there were two reactants with the same mole ratio and are consumed the exact same, then there could be no limiting reactant.
- Fri Oct 05, 2018 3:18 am
- Forum: Balancing Chemical Reactions
- Topic: Balancing reactions tips
- Replies: 29
- Views: 2039
Re: Balancing reactions tips
I start with whichever element is in the equation the least. Also I tend to do single elements last for example O2 or H2. This way you get everything out the way and however many O's or H's there turn out to be in the different products or reactants, it wont matter because we can account for them wi...
- Fri Oct 05, 2018 3:13 am
- Forum: Empirical & Molecular Formulas
- Topic: Empirical formula from MPC
- Replies: 3
- Views: 225
Re: Empirical formula from MPC
Empirical Formulas requires the simplest whole number ratio in a compound, therefore it would be 3:4:3.