Search found 63 matches

by Stella Nguyen 1J
Sat Jan 16, 2021 11:12 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6E.3 Question
Replies: 2
Views: 6

6E.3 Question

Hi everyone! For this problem, I was a little confused about what they meant by second deprotonation, so I was wondering if you guys could explain that to me? In addition, why can we ignore the second deprotonation if the approximation is justified? 6E.11: Calculate the pH of each of the following s...
by Stella Nguyen 1J
Sat Jan 16, 2021 11:05 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6E.1 Question
Replies: 1
Views: 16

6E.1 Question

Hi everyone!

I was unsure of how to start this problem, so I was wondering if you guys could explain it to me? I have included the table with the Ka values below.

6E.1: Calculate the pH of 0.15 M H2SO4(aq) at 25 °C.

Thank you so much!
by Stella Nguyen 1J
Fri Jan 15, 2021 11:37 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Equilibrium Constants to Predict Solubility
Replies: 2
Views: 24

Equilibrium Constants to Predict Solubility

Hi everyone! For one of the bullet points on Outline 1, it says that we should be able to "use equilibrium constants to predict solubility." I don't remember Dr. Lavelle discussing this in the lectures, so I was wondering if you guys could explain how we would be able to predict solubility...
by Stella Nguyen 1J
Fri Jan 15, 2021 9:01 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling Week 2 - Question 5
Replies: 1
Views: 14

Sapling Week 2 - Question 5

Hi everyone! For this question, I was a little confused on how to set it up because the initial concentration isn't given? I thought that we would need the initial concentration to set up an ice table and calculate the percentage that is protonated, so I was wondering if you guys could explain this ...
by Stella Nguyen 1J
Wed Jan 13, 2021 5:13 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: 6B.11 Question
Replies: 2
Views: 17

6B.11 Question

Hi everyone! I was a little confused about how to start this problem, and I was wondering if you guys could explain it to me? 6B.11: A student added solid Na2O to a volumetric flask of volume 200.0 mL, which was then filled with water, resulting in 200.0 mL of NaOH solution. Then 5.00 mL of the solu...
by Stella Nguyen 1J
Fri Jan 08, 2021 1:53 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: Temperature Effect on the Direction of the Reaction
Replies: 4
Views: 23

Temperature Effect on the Direction of the Reaction

Hi everyone!

I'm a little confused on how we apply whether a reaction is exothermic or endothermic to the direction that the reaction will proceed when there is a temperature change. I was wondering if you guys could explain it to me?

Thank you!
by Stella Nguyen 1J
Fri Jan 08, 2021 9:22 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Chemical Equilibrium Part 2 Post Module #30
Replies: 2
Views: 18

Chemical Equilibrium Part 2 Post Module #30

Hi everyone! I was a little unsure on how to carry out question 30 on the post-module assessment for Chemical Equilibrium Part 2, and I was wondering if you guys could explain this to me? Would I first covert the 2.5 moles H2O and 100 g of C into molarity. Then, place them in an ice box and work fro...
by Stella Nguyen 1J
Fri Jan 08, 2021 9:18 am
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Chemical Equilibrium Part 2 Post Module #29
Replies: 1
Views: 18

Chemical Equilibrium Part 2 Post Module #29

Hi everyone! I was unsure of how to set up this problem, and I was wondering if you guys could explain it to me? #29: A researcher fills a 1.00 L reaction vessel with 1.84 x 10^-4 mol of BrCl gas and heats it to 500 K. At equilibrium, only 18.3 % of the BrCl gas remains. Calculate the equilibrium co...
by Stella Nguyen 1J
Fri Jan 08, 2021 9:02 am
Forum: Administrative Questions and Class Announcements
Topic: Sapling Error - Did Question 10 reset?
Replies: 3
Views: 29

Sapling Error - Did Question 10 reset?

Hi everyone! Yesterday, I finished my sapling homework for Week 1, and it even gave me the notification (with the bunny) indicating that I have answered all the questions in the activity. My grade was also recorded in the CCLE gradebook as 5/5. However, today, when I went back on sapling to review t...
by Stella Nguyen 1J
Thu Jan 07, 2021 7:00 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Focus Exercise 5.39 Question
Replies: 2
Views: 50

Focus Exercise 5.39 Question

Hi everyone! For this question, I was wondering if the solutions manual was incorrect when calculating the Kc, which is a value that we would need to find x. Table 5G.2, which I have included below, shows that the reaction N2O4(g) ⇌ 2NO2 has a Kc value of 6.1x10^23. Therefore, I thought that the Kc ...
by Stella Nguyen 1J
Thu Jan 07, 2021 5:50 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Sapling Week 1 - Question 9
Replies: 2
Views: 51

Sapling Week 1 - Question 9

Hi everyone! For question 9 on the sapling homework, I was wondering if you guys could explain to me how to set up the ice box correctly. I had originally set up the ice box with 0.700 as the initial condition for NO and 0.300 as the initial conditions for N2 and O2. Then, I added x to both the N2 a...
by Stella Nguyen 1J
Sat Dec 12, 2020 4:34 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Orbitals and Their Nodal Planes
Replies: 5
Views: 21

Orbitals and Their Nodal Planes

Hi everyone!

I was wondering if you guys could explain to me how we can determine the number of nodal planes in an orbital? I know that the s orbital has no nodal planes, but how would we know how many nodal planes there will be for the other orbitals?

Thank you so much!
by Stella Nguyen 1J
Sat Dec 12, 2020 11:14 am
Forum: Naming
Topic: Oxidation Numbers
Replies: 3
Views: 28

Oxidation Numbers

Hi everyone! I had a general question about oxidation numbers. When we're determining the oxidation number for the transition metal, are we taking into account the whole compound or do we just take into account the coordination compound. I had always done the latter, but when I was reviewing Dr. Lav...
by Stella Nguyen 1J
Wed Dec 09, 2020 8:04 am
Forum: Identifying Acidic & Basic Salts
Topic: Neutralization Reactions
Replies: 2
Views: 12

Neutralization Reactions

Hi everyone!

I noticed that in the textbook problems, neutralization reactions were mentioned multiple times, and I was wondering if you guys could explain what they were?

Thank you so much!
by Stella Nguyen 1J
Wed Dec 09, 2020 8:00 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg Indeterminacy Concept
Replies: 1
Views: 14

Heisenberg Indeterminacy Concept

Hi everyone!

Could you guys explain to me the overall concept of the Heisenberg Interdeterminacy Principle? I understand how to calculate a Heisenberg problem when I see it, but I don't really understand the concept behind it.

Thank you so much!
by Stella Nguyen 1J
Mon Dec 07, 2020 8:26 am
Forum: Lewis Acids & Bases
Topic: Identifying Acids and Bases
Replies: 5
Views: 49

Identifying Acids and Bases

Hi everyone! I'm having trouble identifying acids and bases in general, and I was wondering if you guys could explain how to distinguish the two? I know that acids would usually have an H and bases would usually have an OH, but what other characteristics are there to tell whether something is an aci...
by Stella Nguyen 1J
Sun Dec 06, 2020 9:05 pm
Forum: Amphoteric Compounds
Topic: 6A.17 Question
Replies: 3
Views: 30

6A.17 Question

Hi everyone!

I was wondering if you guys could explain to me how to distinguish whether an oxide is acidic, basic, or amphoteric?

6.17: State whether the following oxides are acidic, basic, or amphoteric: (a) BaO; (b) SO3; (c) As2O3; (d) Bi2O3.

Thank you so much!
by Stella Nguyen 1J
Sat Dec 05, 2020 11:14 am
Forum: Conjugate Acids & Bases
Topic: 6A.1 Question
Replies: 1
Views: 42

6A.1 Question

Hi everyone! I was wondering if you guys could explain to me how to determine the conjugate acid and conjugate base when asked in a problem? 6A.1: Write the formulas of the conjugate acids of (a) CH3NH2, methylamine; (b) NH2NH2, hydrazine; (c) HCO3−; and the conjugate bases of (d) HCO3−; (e) C6H5OH,...
by Stella Nguyen 1J
Tue Dec 01, 2020 1:58 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Focus Exercise 2.27
Replies: 4
Views: 35

Focus Exercise 2.27

Hi everyone! For this problem, I understand that none of the compounds given are considered radicals because they do not have an unpaired electron. I was a little confused by the answer that the solution manual gave for part (b) of this problem, which states that "all of these species are expec...
by Stella Nguyen 1J
Tue Dec 01, 2020 1:48 pm
Forum: Naming
Topic: Naming Coordination Compounds
Replies: 4
Views: 42

Naming Coordination Compounds

Hi everyone!

In the textbook, there is a table in Focus 9 that shows the names and formulas of common ligands, and I was wondering if we would need to memorize those common ligands when naming coordination compounds? I included an image of the table below.

Thank you!
by Stella Nguyen 1J
Tue Dec 01, 2020 1:43 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: 9C.5 Question
Replies: 4
Views: 39

9C.5 Question

Hi everyone! I'm still a little confused on how we distinguish when a ligand is a polydentate vs. when it's a monodentate, and I was wondering if you guys could explain it to me. Would it be a polydentate if there are multiple ligands with lone pairs in the compound? I have included the problem belo...
by Stella Nguyen 1J
Sun Nov 29, 2020 8:34 pm
Forum: Hybridization
Topic: 2F.15 Question
Replies: 3
Views: 31

2F.15 Question

Hi everyone! I was wondering if you guys could explain to me what the s-character of hybrids meant for this problem? 2F.15: Noting that the bond angle of an sp3 hybridized atom is 109.5° and that of an sp2 hybridized atom is 120°, do you expect the bond angle between two hybrid orbitals to increase ...
by Stella Nguyen 1J
Sun Nov 29, 2020 5:40 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelates General Question
Replies: 2
Views: 24

Chelates General Question

Hi everyone!

I was a little confused on when and how chelates are formed. During the lecture, I was confused when Dr. Lavelle was explaining about chelating ligands in general, and I was wondering if you guys could summarize it for me?

Thank you so much!
by Stella Nguyen 1J
Sun Nov 29, 2020 7:49 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Determining Bond Angles
Replies: 9
Views: 47

Determining Bond Angles

Hi everyone!

Whenever a question asks us to determine bond angles, would the bond angles always correspond to the molecular shape? For example, if the molecular shape is linear, the bond angle will always be 180°?

Thank you!
by Stella Nguyen 1J
Sun Nov 29, 2020 7:45 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Determining Molecular Shape General Question
Replies: 2
Views: 32

Determining Molecular Shape General Question

Hi everyone! When we're determining the shape of a more complex compound like, C2H4 or N2H4, would we just look about the two central atoms to determine the molecular shape? For example, the molecular shape for C2H4 would be trigonal planar about the C atom. I was wondering if you guys could explain...
by Stella Nguyen 1J
Sun Nov 29, 2020 7:40 am
Forum: Determining Molecular Shape (VSEPR)
Topic: 2E.29 Question
Replies: 3
Views: 42

2E.29 Question

Hi everyone! When determining which isomer in this problem is polar or nonpolar, would we just have to look at the dipole moments? Since the 3rd isomer has the two chorines direct opposite from each other, does this mean that the dipole moments cancel out? I was wondering if you guys could explain m...
by Stella Nguyen 1J
Tue Nov 24, 2020 5:50 am
Forum: Administrative Questions and Class Announcements
Topic: CHEM 14B Enrollment Question
Replies: 2
Views: 40

CHEM 14B Enrollment Question

Hi everyone!

I noticed that some discussion spots opened up for CHEM 14B, however, it is listed as "no instructors," so I was wondering if you guys knew what this meant?

Thank you so much!
by Stella Nguyen 1J
Sun Nov 22, 2020 11:05 pm
Forum: Hybridization
Topic: Hybridization General Question
Replies: 2
Views: 14

Hybridization General Question

Hi everyone!

I was a little confused about hybridizations, so I was wondering if you guys could clarify the concept for me? Why would we need hybridizations?

Thank you so much!
by Stella Nguyen 1J
Sun Nov 22, 2020 10:21 pm
Forum: Sigma & Pi Bonds
Topic: Sigma & Pi Bonds General Question
Replies: 2
Views: 19

Sigma & Pi Bonds General Question

Hi everyone!

I was wondering when would we need to distinguish between sigma and pi bonds? Are there specific situations where it asks us to determine the difference between sigma and pi bonds?

Thank you so much!
by Stella Nguyen 1J
Thu Nov 19, 2020 8:36 am
Forum: Resonance Structures
Topic: Resonance Hybrids
Replies: 2
Views: 41

Resonance Hybrids

Hi everyone! I was wondering if you guys could explain to me what resonance hybrids are? Is the resonance hybrid the combination of all the resonance structures that we draw for that molecule? In addition to this, when we're looking at a resonance hybrid, are the bond lengths all the same even thoug...
by Stella Nguyen 1J
Thu Nov 19, 2020 8:29 am
Forum: Coordinate Covalent Bonds
Topic: Identifying Lewis Acid and Lewis Base
Replies: 3
Views: 57

Identifying Lewis Acid and Lewis Base

Hi everyone! I was wondering if you guys could clarify with me on how to identify lewis acids and bases for compounds that do not have a charge? I understand that, usually, lewis acids could have a positive charge, which means that they accept the electrons, while lewis bases have a negative charge,...
by Stella Nguyen 1J
Tue Nov 17, 2020 9:32 am
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: Polarizability and Polarizing Power
Replies: 5
Views: 32

Polarizability and Polarizing Power

Hi everyone!

I was wondering if you guys could explain to me what polarizability is and how we would determine what has a bigger polarizing power when comparing cations or anions? I didn't really understand this concept.

Thank you so much!
by Stella Nguyen 1J
Sun Nov 15, 2020 6:17 pm
Forum: Dipole Moments
Topic: Dipole-Dipole Moment General Question
Replies: 5
Views: 41

Dipole-Dipole Moment General Question

Hi everyone!

I was wondering if you guys could explain to me how to recognize when a molecule has a dipole-dipole moment? Is it when there's a partially positive and partially negative region because one atom has a much higher electronegativity than the other atom?

Thank you so much!
by Stella Nguyen 1J
Sun Nov 15, 2020 10:07 am
Forum: Bond Lengths & Energies
Topic: Bond Length & Strength Comparison
Replies: 3
Views: 26

Bond Length & Strength Comparison

Hi everyone! I had a question regarding the comparison of bond lengths. I understand that single bonds are the longest and weakest in strength, while triple bonds are the shortest and strongest in strength. However, what would we do if we are asked to compare the bond length and strength in a situat...
by Stella Nguyen 1J
Sat Nov 14, 2020 5:52 pm
Forum: Dipole Moments
Topic: 3F.15 Question
Replies: 2
Views: 15

3F.15 Question

Hi everyone!

I was wondering if you guys could explain how to describe the difference in the boiling points between these two compounds?

Problem 3F.15: Explain the difference in the boiling points of AsF3 (63)°C and AsF5 (−53)°C.

Thank you so much!
by Stella Nguyen 1J
Fri Nov 13, 2020 9:27 pm
Forum: Dipole Moments
Topic: 3F.5 Question
Replies: 2
Views: 20

3F.5 Question

Hi everyone! I was wondering if you guys could help me on part (c) of this problem? I was a little confused by the answer because they used LDF when they compared the two molecules, and I was wondering why we wouldn't be able to use dipole-dipole in this situation? Problem 3F.5: Suggest, giving reas...
by Stella Nguyen 1J
Fri Nov 13, 2020 9:17 pm
Forum: Lewis Structures
Topic: Lewis Structures Method
Replies: 2
Views: 16

Lewis Structures Method

Hi everyone!

I was wondering if you guys could share some tips and methods on how to draw lewis structures. For harder molecules, I sometimes get confused about which atoms to connect and where to add a double bond or triple bond.

Thank you so much!
by Stella Nguyen 1J
Sun Nov 08, 2020 5:46 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 2A.11 Question
Replies: 2
Views: 15

2A.11 Question

Hi everyone!

I was a little confused on how to approach this problem, so I was wondering if you guys could help me on this?

2A.11: Which M^3+ ions (where M is a metal) are predicted to have the following ground-state electron configurations: (a) [Ar]3d^6; (b) [Ar]3d^5?

Thank you!
by Stella Nguyen 1J
Sun Nov 08, 2020 5:41 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration for Ions
Replies: 1
Views: 11

Electron Configuration for Ions

Hi everyone! When we are writing electron configurations for ions, and the ion has the same amount of electrons as a noble gas, can we write the electron configuration as the noble gas? For example, if we have S^2-, this would have the same electrons as Ar, so could we write its electron configurati...
by Stella Nguyen 1J
Sun Nov 08, 2020 12:31 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Valence Electrons vs. Outer Electrons
Replies: 4
Views: 35

Valence Electrons vs. Outer Electrons

Hi everyone! I had a question regarding valence electrons and outer electrons. Are these considered the same thing? I went to a step-up session during the week, and one of the questions asked to define the core electrons, outer electrons, and valence electrons for different elements, and for some el...
by Stella Nguyen 1J
Sun Nov 08, 2020 12:27 am
Forum: Electron Configurations for Multi-Electron Atoms
Topic: 2A.1 Question
Replies: 1
Views: 22

2A.1 Question

Hi everyone! I had a quick question about this problem in the textbook. For part (a), why would we not include the electrons in the 4d orbital as the valence electrons for the element Sb? 2A.1: Give the number of valence electrons (including d electrons) for each of the following elements: (a) Sb; (...
by Stella Nguyen 1J
Sun Nov 08, 2020 12:14 am
Forum: Trends in The Periodic Table
Topic: Effective Nuclear Charge
Replies: 3
Views: 26

Effective Nuclear Charge

Hi everyone!

I was a little confused about the concept of effective nuclear charge, and I was wondering if you guys could clarify what it is and explain when we would need to use it?

Thank you so much!
by Stella Nguyen 1J
Sun Nov 01, 2020 12:14 pm
Forum: Trends in The Periodic Table
Topic: Focus Exercise 1.13
Replies: 2
Views: 21

Focus Exercise 1.13

Hi everyone! I was wondering if you guys could explain why the ionization energy for oxygen is lower than that of either nitrogen or fluorine? 1.13: Ionization energies usually increase on going from left to right across the periodic table. The ionization energy for oxygen, however, is lower than th...
by Stella Nguyen 1J
Sun Nov 01, 2020 12:10 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 1E. 17 Question
Replies: 4
Views: 32

1E. 17 Question

Hi everyone! I was a little confused on how to approach this problem, and I was wondering if you guys could help me with this question? Question 1E.17: For each of the following ground-state atoms, predict the type of orbital (1s, 2p, 3d, 4f, etc.) from which an electron will be removed to form the ...
by Stella Nguyen 1J
Sun Nov 01, 2020 12:04 pm
Forum: Trends in The Periodic Table
Topic: Sapling Weeks 2,3,4 Homework #18
Replies: 4
Views: 35

Sapling Weeks 2,3,4 Homework #18

Hi everyone!

I'm still a little confused on the periodic trends for the ionic radius, and I was wondering if you guys could explain the trend to me and help me with this question?

Question #18: Arrange these ions according to the ionic radius. P^3- S^2- Cl^- K^+ Ca^2+

Thank you so much!
by Stella Nguyen 1J
Tue Oct 27, 2020 10:22 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: General Heisenberg Question
Replies: 7
Views: 88

General Heisenberg Question

Hi everyone! In Heisenberg problems, will there be instances where we're given a +/- with a percentage? For example, can the problem give us an uncertainty for position as 5.00 +- 1%, or would there always be an actual number after the +- sign? I understand that in theory, we would have to double it...
by Stella Nguyen 1J
Tue Oct 27, 2020 10:18 am
Forum: Properties of Light
Topic: 1A.3 Question
Replies: 3
Views: 52

1A.3 Question

Hi everyone! For this question, I understood why the other answer options were incorrect, but I didn't really understand what the correct answer was saying. I was wondering if you guys could explain it to me? Question 1A.3: Which of the following happens when the frequency of electromagnetic radiati...
by Stella Nguyen 1J
Sun Oct 25, 2020 8:57 am
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Focus 1 Exercises: 1.3
Replies: 2
Views: 25

Focus 1 Exercises: 1.3

Hi everyone! I was a little confused about how to start this problem, and I wondering if you guys could help me with it? Question 1.3: In each second, a certain lamp produces 2.4×10^21 photons with a wavelength of 633 nm. How much power (in watts) is produced as radiation at this wavelength (1W=1J⋅s...
by Stella Nguyen 1J
Fri Oct 23, 2020 3:41 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: 1B.9 Question
Replies: 2
Views: 27

1B.9 Question

Hi everyone! I was a little confused about this problem, and I was wondering if you guys could help me with it? Question 1B.9: A lamp rated at 32 W (1 W = 1 J ⋅ s^−1) emits violet light of wavelength 420 nm. How many photons of violet light can the lamp generate in 2.0 s? How many moles of photons a...
by Stella Nguyen 1J
Thu Oct 22, 2020 11:09 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 1D.1 Question
Replies: 1
Views: 21

1D.1 Question

Hi everyone! I was wondering if you guys could explain how you guys went through this question conceptually, especially part (d)? I understand the first three parts, but I don't really understand part (d). Question 1D.1: Which of the following increase when the electron in a hydrogen atom undergoes ...
by Stella Nguyen 1J
Thu Oct 22, 2020 11:02 pm
Forum: Photoelectric Effect
Topic: Sapling Weeks 2,3,4 Homework #25
Replies: 3
Views: 54

Sapling Weeks 2,3,4 Homework #25

Hi everyone! I had a question about #25 on the Sapling homework. When approaching this problem, would we have to think about the Photoelectric effect? I understand that to find the energy of the photon, we could use Ephoton=hv, where you could find v from the wavelength given. However, I was a littl...
by Stella Nguyen 1J
Mon Oct 19, 2020 10:53 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: 1A.15 Question
Replies: 2
Views: 40

1A.15 Question

Hi everyone! I had some trouble with this problem in the textbook, and I was wondering if you guys could help me with it through step by step? Problem: In the ultraviolet spectrum of atomic hydrogen, a line is observed at 102.6 nm. Determine the values of n for the initial and final energy levels of...
by Stella Nguyen 1J
Sun Oct 18, 2020 10:29 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg Indeterminacy Principle Assessment #23
Replies: 2
Views: 23

Heisenberg Indeterminacy Principle Assessment #23

Hi everyone! I understood how to find the final numerical answer to this problem, but I was wondering why having a small Delta v would not be helpful in this situation? Could you guys explain this to me? Question 23: You are caught in a radar trap and hope to show that the speed measured by the rada...
by Stella Nguyen 1J
Tue Oct 13, 2020 1:22 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg Indeterminacy Principle Assessment #18
Replies: 2
Views: 53

Heisenberg Indeterminacy Principle Assessment #18

Hi everyone! I'm a little confused on where to even start this problem. Could you guys help me with this? Problem 18: The hydrogen atom has a radius of approximately 0.05 nm. Assume that we know the position of an electron to an accuracy of 1 % of the hydrogen radius, calculate the uncertainty in th...
by Stella Nguyen 1J
Tue Oct 13, 2020 11:50 am
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Heisenberg Indeterminacy Principle Assessment #16
Replies: 2
Views: 38

Heisenberg Indeterminacy Principle Assessment #16

Hi everyone! For this question, I chose (A), which states that "the less precisely the position is determined, the less precisely the momentum is known in this instant, and vice versa," however, this was incorrect. Could someone explain to me why (A) was incorrect, and how would we describ...
by Stella Nguyen 1J
Tue Oct 13, 2020 11:28 am
Forum: Quantum Numbers and The H-Atom
Topic: Atomic Spectra Post Assessment #42
Replies: 2
Views: 44

Atomic Spectra Post Assessment #42

Hi everyone! I'm not sure how you would start this problem, so I was wondering if you guys could help me on this. Would we use this equation, En= -hR/n^2? Problem 42: An excited hydrogen atom emits light with a frequency of 1.14 x 1014 Hz to reach the energy level n = 4. In what principle quantum le...
by Stella Nguyen 1J
Tue Oct 13, 2020 11:23 am
Forum: Quantum Numbers and The H-Atom
Topic: Atomic Spectra Post Assessment #41
Replies: 2
Views: 27

Atomic Spectra Post Assessment #41

Hi everyone! Could you guys explain to me why (B) is the correct answer for this problem? I'm not sure how I would figure out which statement is true. Problem #41: For the hydrogen atom which statement is true? Answer Choices: A. The transition from n = 5 to n = 3 involves greater energy than one fr...
by Stella Nguyen 1J
Mon Oct 12, 2020 10:35 pm
Forum: Properties of Light
Topic: Photoelectric Effect Post Assessment #34
Replies: 2
Views: 40

Photoelectric Effect Post Assessment #34

Hi everyone! I was having some trouble on #34 on the Photoelectric Effect Post Assessment. I was wondering if you guys could show me how to do this problem. Since #34 is connected to problem #33, I will also include it. 33. Molybdenum metal must absorb radiation with a minimum frequency of 1.09 x 10...
by Stella Nguyen 1J
Thu Oct 08, 2020 11:01 pm
Forum: Limiting Reactant Calculations
Topic: Fundamental M. 11
Replies: 1
Views: 69

Fundamental M. 11

Hi everyone! After I finished this problem, I found out that the answers that I got were incorrect. Can you guys help me through this step by step to see where I messed up? Problem: A reaction vessel contains 5.77 g of white phosphorus and 5.77 g of oxygen. The first reaction to take place is the fo...
by Stella Nguyen 1J
Thu Oct 08, 2020 6:33 pm
Forum: Molarity, Solutions, Dilutions
Topic: Fundamental G.25
Replies: 1
Views: 49

Fundamental G.25

Hi everyone! I had some trouble with this problem. I was wondering how we would carry it out? Problem: Practitioners of the branch of alternative medicine known as homeopathy claim that very dilute solutions of substances can have an effect. Is the claim plausible? To explore this question, suppose ...
by Stella Nguyen 1J
Wed Oct 07, 2020 4:33 pm
Forum: Limiting Reactant Calculations
Topic: Fundamental M.9
Replies: 3
Views: 60

Fundamental M.9

Hi everyone! I had trouble with solving this problem, and I was wondering if you guys could help me on it? Problem: Copper(II) nitrate reacts with sodium hydroxide to produce a precipitate of light blue copper(II) hydroxide. (a) Write the net ionic equation for the reaction. (b) Calculate the maximu...
by Stella Nguyen 1J
Tue Oct 06, 2020 2:39 pm
Forum: Molarity, Solutions, Dilutions
Topic: Fundamental G.13
Replies: 4
Views: 53

Fundamental G.13

Hi everyone! For problem 13 in Fundamental G, I didn't really know how to start it. Could you guys help me on this problem? Problem: To prepare a fertilizer solution, a florist dilutes 1.0 L of 0.20 M NH4NO3(aq) by adding 3.0 L of water. The florist then adds 100. mL of the diluted solution to each ...
by Stella Nguyen 1J
Mon Oct 05, 2020 9:59 pm
Forum: Empirical & Molecular Formulas
Topic: Fundamental F. 17
Replies: 6
Views: 75

Fundamental F. 17

Hi Everyone! I have a quick question about problems that are similar to this. After I find the empirical formula and molecular formula, how would I know which order each element comes in. I got the correct ratio in the empirical formula and subscripts in the molecular formula, however I got the orde...

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