CHEMISTRY COMMUNITY

Aashka Popat 1A

are there certain equations that you can only use when looking as light as a photon vs. wave, or can you use all equations for any situation.

Aashka Popat 1A

Why do weak acids and bases affect pH, but strong acids and bases do not?

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What is respiratory acidosis and what does it have to do with carbon dioxide?

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How is acid rain formed and how could we reduce it?

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I think that Cobalt is the metal in Vitamin B-12, but what is the biological function?

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What is an amphoteric compound and how do you identify them?

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How would you determine whether a compound is an acid or a base based on a lewis structure?

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This is the question: Write the chemical equations for the proton transfer equilibria of the following acids in aqueous solution and identify the conjugate acid–base pairs in each case: (a) H2SO4; (b) C6H5NH3+, anilinium ion; (c) H2PO4-; (d) HCOOH, formic acid; (e) NH2NH3+, hydrazinium ion. I'm not ...

Aashka Popat 1A

What exactly are conjugate acids and bases, and how would you write the formula for a compound's conjugate acids?

Aashka Popat 1A

Is there a way to tell based on the chemical formula of a compound whether it is an acid or a base?

Aashka Popat 1A

Why can transition metals have different oxidation numbers, and why are they necessary for coordination compounds?

Aashka Popat 1A

What is the distinction between a Lewis acid/base and a Bronsted acid/base? Why are they interchangeable?

Aashka Popat 1A

this is the question:

I understand the question, but for parts c and d, what does the (en) and (edta) mean?

Aashka Popat 1A

What is a chelate and how would you be able to tell from looking at structure of a complex whether it can form a chelating complex?

Aashka Popat 1A

Which of the following ligands can be polydentate? If the ligand can be polydentate, give the maximum number of places on the ligand that can bind simultaneously to a single metal center: (a) HN(CH2CH2NH2)2; (b) (CO3)2-; (c) H2O; (d) oxalate. This question asks which of the following compounds could...

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Why are double/triple bonds treated as a single region of electron concentration in the VSEPR model?

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What is an induced-dipole and how is it different from a dipole?

Aashka Popat 1A

This is the question: (a) What is the shape of a thionyl chloride molecule, SOCl2? Sulfur is the central atom. (b) How many different OSCl bond angles are there in this molecule? (c) What values are expected for the OSCl and ClSCl bond angles? For part c, how do we figure out the expected bond angles?

Aashka Popat 1A

This is the question: a) What is the shape of a ClO2+ ion? (b) What is the expected OClO bond angle?

I'm ok with part a, but I don't really understand how we know the bond angle is less than 120 degrees?

Aashka Popat 1A

The question is: Below are ball-and-stick models of two molecules. In each case, indicate whether there must be, may be, or cannot be one or more lone pairs of electrons on the central atom. In part a, the angular molecule has a 120 degree bond angle and the answer says it must have lone pairs, but ...

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What does it mean for a liquid to have a high viscosity?

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this was the question: For which of the following molecules will dipole–dipole interactions be important: (a) CH4; (b) CH3Cl; (c) CH2Cl2; (d) CHCl3; (e) CCl4?

What are the characteristics of a dipole-dipole interactions; how would I know when it would be important?

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This is the question: Identify the types of attractive intermolecular interactions that might arise between molecules of each of the following sub- stances: (a) NH2OH; (b) CBr4; (c) H2SeO4; (d) SO2.

Can anyone help me with this problem, I don't really understand the differences between these bonds?

Aashka Popat 1A

What does it mean to for a cation to have polarizing power, and how would I know which have higher polarizing power? are there trends on the periodic table?

Aashka Popat 1A

Can anyone explain what a dipole moment is I am having trouble understanding, and does it have anything to do with determining the shape of a molecule?

Aashka Popat 1A

What is the Aufbau principle and why does the 4s subshell have lower energy than the 3d subshell?

Aashka Popat 1A

What elements do the exceptions to the octet rule apply to and why is this able to happen?

Aashka Popat 1A

What exactly is formal charge and why does it help us find lower energy structures?

Aashka Popat 1A

Can anyone explain what the Rydberg constant means and what we would use it for?

Aashka Popat 1A

I'm having trouble with part d of this question, which asks us to draw the lewis structure of BrF3. I don't understand how to arrange the electrons to give each atom an octet?

Aashka Popat 1A

This is the question: On the basis of the expected charges on the monatomic ions, give the chemical formula of each of the following compounds: (a) magnesium arsenide; (b) indium(III) sulfide; (c) aluminum hydride; (d) hydrogen telluride; (e) bismuth(III) fluoride. I don't know how to approach this ...

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This question asks which orbital which type of orbital will need to be removed in order to form a +1 electron (For each of the following ground-state atoms, predict the type of orbital (1s, 2p, 3d, 4f, etc.) from which an electron will need to be removed to form the +1 ions: (a) Zn; (b) Cl; (c) Al; ...

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This is the question: Which M2+ ions (where M is a metal) are predicted to have the following ground-state electron configurations: (a) [Ar]3d7; (b) [Ar]3d6; (c) [Kr]4d4; (d) [Kr]4d3?

I don't really know how to approach this question, could anyone explain it to me?

Aashka Popat 1A

This is the question: Give the ground-state electron configuration expected for
each of the following ions: (a) Cu+; (b) Bi3+; (c) Ga3+; (d) Tl3+

I figured out parts a and c, but my answers were wrong for part b and d, could anyone explain those electron configurations to me?

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This is the question: Give the number of valence electrons (including d electrons) for each of the following elements: (a) Sb; (b) Si; (c) Mn; (d) B. I understand how to find the number of valence electrons, but I am confused about why the question says "including d electrons;" how does it...

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This is the question: What is the minimum uncertainty in the speed of an electron confined within a lead atom of diameter 350. pm? Model the atom as a one-dimensional box with a length equal to the diameter of the actual atom. For this problem, I am trying to use the uncertainty equation but am uncl...

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This was the question: 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 base- ball thrown at 92 mph? I found the wavelength using the mass given in the problem, but I am confused as to why the problem included the range of mass of the base...

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Protons and neutrons have nearly the same mass. How different are their wavelengths? Calculate the wavelength of each particle when traveling at 2.75 x 10^5 m/s in a particle accelerator and report the difference as a percentage of the wavelength of the neutron. Since protons and neutrons have appro...

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This is the question: A lamp rated at 32 W (1 W = 1 J/s) 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? Since the time interval is 2 seconds, I figured out that there were 64 joule...

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This is the question: The g-ray photons emitted by the nuclear decay of a technetium-99 atom used in radiopharmaceuticals have an energy of 140.511 keV. Calculate the wavelength of these g-rays. I'm not sure how to do this problem or what formulas to use; so far I converted the keV to Joules but I d...

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This is the question: Which member of each pair has the smaller first ionization energy: (a) Ca or Mg; (b) Mg or Na; (c) Al or Na?

I'm confused on this question -- would I be able to use the periodic table to find the ionization energy/how would I do this?

Any help would be great thanks!

Aashka Popat 1A

The question is: Which of the following statements are true for many-elec- tron atoms? If false, explain why. (a) The effective nuclear charge Zeffe is independent of the number of electrons present in an atom. (b) Electrons in an s-orbital are more effective than those in other orbitals at shieldin...

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Which of the following increase when the electron in a hydrogen atom undergoes a transition from the 1s-orbital to a 2p-orbital? (a) Energy of the electron. (b) Value of n. (c) Value of l. (d) Radius of the atom. I'm confused about the phrasing of the question, could anyone explain what the transiti...

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This is the question: The velocity of an electron that is emitted from a metallic surface by a photon is 3.6 3 103 km?s21. (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 reaches 2.50 3 1016 Hz. How m...

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This is what the question is asking: In the spectrum of atomic hydrogen, several lines are generally classified together as belonging to a series (for example, Balmer series or Lyman series, as shown in Fig. 1A.10). What is common to the lines within a series that makes grouping them together logica...

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For part b of F 13 ( In an experiment,4.14g of phosphorus combined with chlorine to produce 27.8 g of a white solid compound. (a) What is the empirical formula of the compound? (b) Assuming that the empirical and molecular formulas of the compound are the same, what is its name?), I found the formul...

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I'm confused about part a: A student prepared a solution of sodium carbonate by adding 2.111 g of the solid to a 250.0-mL volumetric flask and adding water to the mark. Some of this solution was transferred to a buret. What volume of solution should the student transfer into a flask to obtain (a) 2....

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This was the question: (a) Calculate the mass, in grams, of one water molecule. (b) Determine the number of H2O molecules in 1.00 kg of water.

I found the molar mass of H2O and got 18.02 g/mol, but I'm not sure what to do from there, can anyone help me? Thanks

Aashka Popat 1A

The problem is: You need to prepare 510. g of an aqueous solution containing 5.45% KNO3 by mass. Describe how you would prepare the solution and what mass of each component you would use. I'm not sure how to start the problem or how to use the given information, specifically with the 5.45%. Would I ...

Aashka Popat 1A

This is the question: The molar mass of the metal hydroxide M(OH)2 is 74.10 g?mol21. What is the molar mass of the sulfide of this metal? For this problem, I don't know how to approach the question because I don't know what the "sulfide" of the metal means. Does anyone know what this means...

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