## Search found 60 matches

Sat Jan 09, 2021 9:41 pm
Forum: Applying Le Chatelier's Principle to Changes in Chemical & Physical Conditions
Topic: pressure and concentration
Replies: 3
Views: 14

### pressure and concentration

Why is it that a change in pressure causes an increase in concentration?
Sat Jan 09, 2021 9:38 pm
Forum: Equilibrium Constants & Calculating Concentrations
Topic: Kc and Kp
Replies: 3
Views: 12

### Kc and Kp

How do I convert from Kc to Kp?
Sat Jan 09, 2021 9:07 pm
Forum: Student Social/Study Group
Topic: New Year Resolutions?
Replies: 50
Views: 137

### Re: New Year Resolutions?

to be more productive :)
Fri Jan 08, 2021 7:23 am
Forum: Ideal Gases
Topic: PV=nRT
Replies: 61
Views: 385

### Re: PV=nRT

P=pressure
V=volume of gas
n= number of moles
R= universal gas constant
T= temperature
Fri Jan 08, 2021 7:21 am
Forum: Non-Equilibrium Conditions & The Reaction Quotient
Topic: Water
Replies: 28
Views: 86

### Water

Hey guys, I was just wondering when do we include H2O in the ice table???
Wed Dec 16, 2020 5:07 am
Forum: Student Social/Study Group
Topic: Final Jitters
Replies: 226
Views: 35555

### Re: Final Jitters

I take a long bath and drink some warm tea :)))
Sun Dec 13, 2020 9:06 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Textbook Question 6B.3
Replies: 2
Views: 9

### Textbook Question 6B.3

How do I solve this?
Sun Dec 13, 2020 8:12 am
Forum: Amphoteric Compounds
Topic: How to figure amphoteric compounds
Replies: 4
Views: 34

### How to figure amphoteric compounds

Do I have to draw the lewis structure to know if a compound is amphoteric or not?
Sat Dec 12, 2020 9:11 pm
Forum: Naming
Topic: "ferrate"
Replies: 8
Views: 62

### "ferrate"

Is it just supposed to be known that Fe or Iron is spelled out as ferrate in coordination compounds or is there a condition for it??
Sat Dec 12, 2020 9:00 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Week 10 Sapling Q10
Replies: 5
Views: 45

### Week 10 Sapling Q10

From what I tried figuring out, I got this as my answer but its saying I'm incorrect. I thought I got all the strong acids and strong bases but if not, can someone explain whats wrong?
Sat Dec 12, 2020 8:30 pm
Forum: Naming
Topic: Textbook Question 9C.1
Replies: 5
Views: 42

### Textbook Question 9C.1

for question c, how do I name [CO(CN)5(OH2)]2-
Sun Dec 06, 2020 10:53 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Textbook Question 2E.13 (I3-)
Replies: 2
Views: 12

### Textbook Question 2E.13 (I3-)

Why is I3- linear?
Sun Dec 06, 2020 8:42 pm
Forum: Hybridization
Topic: Pi bonds Hybridization
Replies: 2
Views: 19

### Pi bonds Hybridization

What is the hybridization of a pi bond?
Sun Dec 06, 2020 8:37 pm
Forum: Sigma & Pi Bonds
Topic: Pi bonds
Replies: 7
Views: 46

### Pi bonds

I know Pi bonds appear when there's a double or triple bond but is there a specific way to label which is which? or do we just need to know that pi bonds appear in certain conditions?
Sun Dec 06, 2020 8:30 pm
Forum: Naming
Topic: Number after Metal
Replies: 9
Views: 60

### Number after Metal

How do I determine the number that goes after the metal of a compound? Eg. cobalt(II)
Sun Dec 06, 2020 8:28 pm
Forum: Naming
Topic: "(en)" Sapling
Replies: 19
Views: 98

### "(en)" Sapling

Could someone explain what the (en) means in Cd(en)Br2] ? Found it on Sapling.
Thu Dec 03, 2020 9:29 pm
Forum: Naming
Topic: Sapling 9 #1
Replies: 7
Views: 39

### Sapling 9 #1

[Co(NH3)5Cl]Cl2 To name this compound, I took the ligand ammonia and there are 5 of them so I named this part as pentaammine, then saw that there are 3 chlorines so trichloro, and lastly the metal is cobalt, so I thought the systematic name would be Pentaamminetrichlorocobalt(III). But this seems to...
Sun Nov 29, 2020 9:15 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Nonpolar bonds
Replies: 7
Views: 31

### Nonpolar bonds

Hi,
On sapling I had a question about bond and molecule polarity but from this I was wondering, what would an example of a nonpolar bond be?
Sun Nov 29, 2020 9:08 pm
Forum: Hybridization
Topic: Determining Hybridization
Replies: 3
Views: 43

### Determining Hybridization

Hi everyone,

# of regions of electron density=hybridization?
Sun Nov 29, 2020 8:45 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar
Replies: 10
Views: 67

### Polar

What are factors that contribute to whether a molecule's polar or not? is it just the lone pairs?
Sun Nov 29, 2020 8:37 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 4
Views: 29

### Bond Angles

Are there any other factors used to determine bond angles other than geometrical shape and lone pairs? I'm having a hard time gettinh the sapling questions right.
Sun Nov 29, 2020 8:59 am
Forum: Student Social/Study Group
Topic: How to study for class
Replies: 30
Views: 171

### How to study for class

Hi everyone,
I was wondering if anyone relies on the textbook more to learn content rather than the lectures. Since the lectures are recorded, it's sometimes really hard for me to get them going especially as an international student with time difference. If so, any tips?
Wed Nov 25, 2020 9:32 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sapling Question #12
Replies: 2
Views: 23

### Sapling Question #12

Hi everyone, I've been trying to figure this question out and with the molar masses and composition I've concluded that it's methanol and I drew the lewis structure as can be seen in the attached image. But sapling says it's incorrect. I was wondering what I am doing wrong. An organic compound that ...
Mon Nov 23, 2020 11:17 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: isoelectronic
Replies: 12
Views: 80

### isoelectronic

Hi everyone,
What does isoelectronic mean?
Mon Nov 23, 2020 11:17 pm
Forum: Ionic & Covalent Bonds
Topic: Textbook Question 1A.13
Replies: 4
Views: 39

### Textbook Question 1A.13

For part c, how do I know which atoms bond with others? Do the parentheses help? Draw the complete Lewis structure for each of the following compounds: (a) formaldehyde, HCHO, which as its aqueous solution, “formalin,” is used to preserve biological specimens; (b) methanol, CH3OH, the toxic compound...
Mon Nov 23, 2020 11:05 pm
Forum: Quantum Numbers and The H-Atom
Topic: Silver Electron Configuration
Replies: 9
Views: 25

### Silver Electron Configuration

Hi everyone,
quick question:
Why is silver's electron configuration [Kr] 5s1, 4d10? By the usual order it would be [Kr] 5s2, 4d9
Mon Nov 23, 2020 10:58 pm
Forum: Trends in The Periodic Table
Topic: Textbook Question Focus 1.13
Replies: 2
Views: 15

### Textbook Question Focus 1.13

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 that of either nitrogen or fluorine. Explain this anomaly. I've read explanations online but I don't really understand what they mean. Can someone...
Mon Nov 23, 2020 10:56 pm
Forum: Trends in The Periodic Table
Topic: Textbook Question 1F.3
Replies: 4
Views: 30

### Textbook Question 1F.3

1F.3 Place the following ions in order of increasing ionic radius: S2-, Cl-, P3-.
How would I do this?
Sat Nov 14, 2020 7:52 am
Forum: Formal Charge and Oxidation Numbers
Topic: Clarification
Replies: 8
Views: 37

### Clarification

Adding up all the formal charges on each atom in a lewis structure equals to the overall charge? the one that's on the [ ]*
(the asterisk)
Sat Nov 14, 2020 7:20 am
Forum: Electronegativity
Topic: General Idea of Electronegativity [ENDORSED]
Replies: 3
Views: 40

### General Idea of Electronegativity[ENDORSED]

Hi everyone. I heard from my TA that we won't be receiving periodic tables with values of electronegativity for the midterm. From the fact that whether a bond is ionic or covalent comes from the electronegativity difference, what exactly should I be able to understand or do for the midterm in terms ...
Sat Nov 14, 2020 7:15 am
Forum: Ionic & Covalent Bonds
Topic: Midterm 2 DNA base pairs [ENDORSED]
Replies: 1
Views: 315

### Midterm 2 DNA base pairs[ENDORSED]

Hi everyone.
Has it been confirmed whether we need to remember DNA base pairs for the midterm? It was brought up as an example in some lectures so I was wondering.
Sat Nov 14, 2020 6:58 am
Forum: Ionic & Covalent Bonds
Topic: Midterm 2 Content
Replies: 1
Views: 11

### Midterm 2 Content

Hi everyone!
Is Friday's lecture included in the second midterm?
Wed Nov 11, 2020 9:31 pm
Forum: Resonance Structures
Topic: Sapling Q4
Replies: 1
Views: 25

### Sapling Q4

I'm trying to figure out the resonance structures for a carbamate ion. Can someone tell me what I am doing wrong??
Sun Nov 08, 2020 9:54 pm
Forum: Quantum Numbers and The H-Atom
Topic: Pz Py Pz
Replies: 5
Views: 42

### Pz Py Pz

What exactly do Px, Py, and Pz represent? I wrote them down from a lecture for the magnetic quantum number but I don't really know what they mean
Sun Nov 08, 2020 9:43 pm
Forum: Ionic & Covalent Bonds
Topic: Sapling Question #3
Replies: 6
Views: 60

### Re: Sapling Question #3

Also, what exactly does it mean when it says "Phosphorus is able to access 3d orbitals for bonding and, therefore, is not constrained by the octet rule."??
Sun Nov 08, 2020 9:33 pm
Forum: Ionic & Covalent Bonds
Topic: Sapling Question #3
Replies: 6
Views: 60

### Sapling Question #3

Hi everyone
How do I find the lewis structure for the phosphate ion?
Sun Nov 08, 2020 9:27 pm
Forum: Ionic & Covalent Bonds
Topic: Electron Affinity
Replies: 8
Views: 59

### Electron Affinity

Can someone explain what electron affinity is? I'm still having a hard time understanding it...
Fri Nov 06, 2020 6:14 am
Forum: Lewis Structures
Topic: Sapling Question #3
Replies: 2
Views: 36

### Sapling Question #3

Hi everyone I havent taken chemistry since freshman year in high school and this sapling question asked for the Lewis structures for the nitrite ion and nitrate ion and it didn't give the chemical formula. Do I have to know the chemical formula for ions?? or any kind of compound?? or will they be gi...
Fri Nov 06, 2020 6:10 am
Forum: Ionic & Covalent Bonds
Topic: Drawing Lewis structures (sapling)
Replies: 3
Views: 43

### Drawing Lewis structures (sapling)

Hi everyone!
When I "draw" the structures on sapling and have to add charges (the plus and negative signs) to the atoms, does it matter which atoms I add them to?
For example
for CO3 2-, does it matter which O I put the negative charges on?
Sun Nov 01, 2020 9:06 pm
Forum: Quantum Numbers and The H-Atom
Topic: Sapling Question (excited-state, ground-state)
Replies: 4
Views: 40

### Sapling Question (excited-state, ground-state)

Hi everyone,
I'm confused about how to identify the element. How do I do this?

Sun Nov 01, 2020 8:54 pm
Forum: Trends in The Periodic Table
Replies: 10
Views: 53

Hi everyone
How do I order Cs, Cs-, Cs+ in order from largest to smallest radius?
Fri Oct 30, 2020 10:43 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Sapling Question on number of electrons
Replies: 6
Views: 87

### Sapling Question on number of electrons

Hi everyone! So anytime that the quantum numbers are specified up to the ml number, can I assume that the number of electrons in the atom is 2? because according to pauli's exclusion principle, there can be no more than 2 electrons in the same orbital. the question on sapling: How many electrons in ...
Wed Oct 28, 2020 10:27 pm
Forum: Photoelectric Effect
Topic: UA Session Question
Replies: 2
Views: 45

### UA Session Question

Hi everyone! Could somebody help me with this question?

Q8. You have a metal, Rubidium, which has a work function of 2.3 eV. If the electrons being
ejected from the metal have a wavelength of 1.7 x 10^5 m, what is the wavelength of the incident
light?
Wed Oct 28, 2020 9:24 am
Forum: Molarity, Solutions, Dilutions
Topic: UA Session Question
Replies: 2
Views: 38

### UA Session Question

Hi! Could someone teach me how to do part b of this question? Arsenic is a toxic substance that can sometimes be found in groundwater. Arsenic has a molar mass of 74.922 g/mol. a) Calculate the molarity if 1.125 grams of arsenic are added to 235 mL of water. b) What volume (mL) of concentrated arsen...
Sat Oct 24, 2020 8:43 pm
Forum: Properties of Light
Topic: Textbook Question 1A.5
Replies: 5
Views: 36

### Textbook Question 1A.5

1A.5 Arrange the following types of photons of electromagnetic radiation in order of increasing energy: γ-rays, visible light, ultraviolet radiation, microwaves, x-rays.

Does this question mean we need to remember the whole EM spectrum? Just the order? or wavelengths, frequencies too
Sat Oct 24, 2020 8:41 pm
Forum: DeBroglie Equation
Topic: Textbook Question 1B.15
Replies: 6
Views: 73

### Textbook Question 1B.15

Hi everyone! Can somebody explain part b for me? The velocity of an electron that is emitted from a metallic surface by a photon is 3.6×10^3km⋅s−1. (a) What is the wavelength of the ejected electron? (b) No electrons are emitted from the surface of the metal until the frequency of the radiation reac...
Sat Oct 24, 2020 8:25 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Textbook Question 1A.13
Replies: 1
Views: 27

### Textbook Question 1A.13

Hi everyone! How do I solve this question? 1A.13 Use the Rydberg formula for atomic hydrogen to calculate the wavelength of radiation generated by the transition from n=2 to n=1. (b) What is the name given to the spectroscopic series to which this transition belongs? (c) Use Table 1A.1 to determine ...
Sat Oct 24, 2020 8:15 pm
Forum: DeBroglie Equation
Topic: Textbook Question 1B.21
Replies: 2
Views: 42

### Textbook Question 1B.21

Hi everyone! Can someone go through this question step by step for me?

A baseball must weigh between 5.00 and 5.25 ounces (1 ounce=28.3 g). What is the wavelength of a 5.15-ounce baseball thrown at 92 mph?
Sat Oct 24, 2020 7:56 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: Textbook Question 1B.25
Replies: 4
Views: 68

### Textbook Question 1B.25

Hi everyone! In the solutions manual, I see a constant that looks like the Plancks constant with a bar through it. What does the h bar constant mean??
Sun Oct 18, 2020 5:53 pm
Forum: DeBroglie Equation
Topic: Textbook Question 1B.19
Replies: 2
Views: 17

### Textbook Question 1B.19

Hi! After I figure out the wavelengths, how do I calculate the percentage of the wavelength of the neutron?? The solutions manual didn't explain this part and I was wondering if I did it correctly. Protons and neutrons have nearly the same mass. How different are their wavelengths? Calculate the wav...
Sun Oct 18, 2020 5:49 pm
Forum: DeBroglie Equation
Topic: Textbook Question 1B.9
Replies: 1
Views: 22

### Textbook Question 1B.9

Hi! How do I solve this question?

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 are emitted in that time interval?
Sun Oct 18, 2020 5:40 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Textbook Question 1A.13
Replies: 2
Views: 29

### Textbook Question 1A.13

Hi! How do I do the first part of the question? Use the Rydberg formula for atomic hydrogen to calculate the wavelength of radiation generated by the transition from n=2 to n=1. (b) What is the name given to the spectroscopic series to which this transition belongs? (c) Use Table 1A.1 to determine t...
Sun Oct 18, 2020 5:34 pm
Forum: Einstein Equation
Topic: Textbook Question 1B.7
Replies: 4
Views: 54

### Textbook Question 1B.7

Hi! Can somebody help me with question B? Sodium vapor lamps, used for public lighting, emit yellow light of wavelength 589 nm. How much energy is emitted by (a) an excited sodium atom when it generates a photon; (b) 5.00 mg of sodium atoms emitting light at this wavelength; (c) 1.00 mol of sodium a...
Thu Oct 15, 2020 6:16 am
Forum: Photoelectric Effect
Topic: Textbook Question 1A.11
Replies: 3
Views: 51

### Textbook Question 1A.11

Hi guys, I'm having a hard time understanding what the answer in the solution manual means. Could somebody explain this with a bit more detail please? 1.11 In the spectrum of atomic hydrogen, several lines are generally classified together as belong to a series (for example, Balmer series, Lyman ser...
Sat Oct 10, 2020 9:46 am
Forum: General Science Questions
Topic: The Concept of Moles
Replies: 3
Views: 52

### Re: The Concept of Moles

Hi! Just like how a "dozen" means 12 of something, a "mole" means 6.022..×10^23 of something. It's a convenient number used in chemistry due to the large amount of particles in substances and things. For example, 1 mole of magnesium atoms would mean 6.022..×10^23 magnesium atoms....
Sat Oct 10, 2020 9:41 am
Forum: Molarity, Solutions, Dilutions
Topic: Textbook Question G.15
Replies: 2
Views: 39

### Textbook Question G.15

(a) What volume of 0.778 M Na2CO3(aq) should be diluted to 150.0 mL with water to reduce its concentration to 0.0234 M Na2CO3(aq)? (b) An experiment requires the use of 60.0 mL of 0.50 M NaOH(aq). The stockroom assistant can only find a reagent bottle of 2.5 M NaOH(aq). How can the 0.50 M NaOH(aq) b...
Sat Oct 10, 2020 2:21 am
Forum: Limiting Reactant Calculations
Topic: Textbook Question M.15
Replies: 1
Views: 40

### Textbook Question M.15

Hi everyone, how do I solve part B of question M.15 Aluminum metal reacts with chlorine gas to produce aluminum chloride. In one preparation, 255 g of aluminum is placed in a container holding 535 g of chlorine gas. After reaction ceases, it is found that 300. g of aluminum chloride has been produce...
Thu Oct 08, 2020 11:59 pm
Forum: Balancing Chemical Reactions
Topic: Naming compounds
Replies: 21
Views: 190

### Naming compounds

Hi everyone,
I was wondering if anyone knows if it is required to remember how to name compounds in both word and chemical formula form. Many of the questions from the textbook have step a) as writing out the chemical formula and sometimes I would have to search what the compound is.
Thu Oct 08, 2020 11:46 pm
Forum: Limiting Reactant Calculations
Topic: M.9 Texbook Question
Replies: 2
Views: 51

### M.9 Texbook Question

Hi everyone, I haven't done chemistry since sophomore year of hs and I'm confused about the concept of ionic equations. How do I find the ionic equation for question M.9? Copper(II) nitrate reacts with sodium hydroxide to produce a precipitate of light blue copper(II) hydroxide. (a) Write the net io...
Thu Oct 08, 2020 8:30 am
Forum: Limiting Reactant Calculations
Topic: Textbook Question M.5
Replies: 7
Views: 64

### Textbook Question M.5

How do I solve part B of this question?
The reaction 6ClO2(g)+2BrF3(l)→6ClO2F(s)+Br2(l) is carried out with 12 mol ClO2 and 5 mol BrF3
(a) Identify the excess reactant.
(b) Estimate how many moles of each product will be produced and how many moles of the excess reactant will remain.