CHEMISTRY COMMUNITY

Nina Fukui 2J

Why is it that a change in pressure causes an increase in concentration?

Nina Fukui 2J

How do I convert from Kc to Kp?

Nina Fukui 2J

to be more productive :)

Nina Fukui 2J

P=pressure
V=volume of gas
n= number of moles
R= universal gas constant
T= temperature

Nina Fukui 2J

Hey guys, I was just wondering when do we include H2O in the ice table???

Nina Fukui 2J

I take a long bath and drink some warm tea :)))

Nina Fukui 2J

How do I solve this?

Nina Fukui 2J

Do I have to draw the lewis structure to know if a compound is amphoteric or not?

Nina Fukui 2J

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??

Nina Fukui 2J

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?

Nina Fukui 2J

for question c, how do I name [CO(CN)5(OH2)]2-

Nina Fukui 2J

Why is I3- linear?

Nina Fukui 2J

What is the hybridization of a pi bond?

Nina Fukui 2J

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?

Nina Fukui 2J

How do I determine the number that goes after the metal of a compound? Eg. cobalt(II)

Nina Fukui 2J

Could someone explain what the (en) means in Cd(en)Br2] ? Found it on Sapling.

Nina Fukui 2J

[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...

Nina Fukui 2J

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?

Nina Fukui 2J

Hi everyone,

# of regions of electron density=hybridization?

Nina Fukui 2J

What are factors that contribute to whether a molecule's polar or not? is it just the lone pairs?

Nina Fukui 2J

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.

Nina Fukui 2J

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?

Nina Fukui 2J

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 ...

Nina Fukui 2J

Hi everyone,
What does isoelectronic mean?

Nina Fukui 2J

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...

Nina Fukui 2J

Hi everyone,
quick question:
Why is silver's electron configuration [Kr] 5s1, 4d10? By the usual order it would be [Kr] 5s2, 4d9

Nina Fukui 2J

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...

Nina Fukui 2J

1F.3 Place the following ions in order of increasing ionic radius: S2-, Cl-, P3-.
How would I do this?

Nina Fukui 2J

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)

Nina Fukui 2J

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 ...

Nina Fukui 2J

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.

Nina Fukui 2J

Hi everyone!
Is Friday's lecture included in the second midterm?

Nina Fukui 2J

I'm trying to figure out the resonance structures for a carbamate ion. Can someone tell me what I am doing wrong??

Nina Fukui 2J

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

Nina Fukui 2J

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."??

Nina Fukui 2J

Hi everyone
How do I find the lewis structure for the phosphate ion?

Nina Fukui 2J

Can someone explain what electron affinity is? I'm still having a hard time understanding it...

Nina Fukui 2J

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...

Nina Fukui 2J

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?

Nina Fukui 2J

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

Nina Fukui 2J

Hi everyone
How do I order Cs, Cs-, Cs+ in order from largest to smallest radius?

Nina Fukui 2J

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 ...

Nina Fukui 2J

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?

Nina Fukui 2J

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...

Nina Fukui 2J

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

Nina Fukui 2J

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...

Nina Fukui 2J

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 ...

Nina Fukui 2J

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?

Nina Fukui 2J

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??

Nina Fukui 2J

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...

Nina Fukui 2J

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?

Nina Fukui 2J

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...

Nina Fukui 2J

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...

Nina Fukui 2J

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...

Nina Fukui 2J

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....

Nina Fukui 2J

(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...

Nina Fukui 2J

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...

Nina Fukui 2J

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.

Nina Fukui 2J

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...

Nina Fukui 2J

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.

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