CHEMISTRY COMMUNITY

Jeremiah Hutauruk

involves k

Jeremiah Hutauruk

unique avg rate law

Jeremiah Hutauruk

one reactant is zero order and one is in first order

Jeremiah Hutauruk

what is the difference between zero and first order reaction rates?

Jeremiah Hutauruk

what is the difference between first and second order reaction rates?

Jeremiah Hutauruk

add the potential difference of the two half-reactions

Jeremiah Hutauruk

is h20 supposed to be in cell diagram? and is it wrong to put it in the cell diagram since it's neutral anyways?

Jeremiah Hutauruk

can we add h2o in cell diagram?

Jeremiah Hutauruk

how can we find if ph is basic or acidic with van hoff equation?

Jeremiah Hutauruk

do we need to van hoff equation for the test?

Jeremiah Hutauruk

What is the difference between gibbs free energy and entropy?

Jeremiah Hutauruk

It will cover Gibbs energy and electrochemistry.

Jeremiah Hutauruk

I think it is because more complex compounds have more bonds, thus more energy to break. And by having more bonds, it needs more energy to keep its form and more energy means more entropy, thus making it unstable.

Jeremiah Hutauruk

No he didn't

Jeremiah Hutauruk

thank you guys

Jeremiah Hutauruk

For changes in volume and temperature, do we just simply add them to get the total entropy?

Jeremiah Hutauruk

Does w=-PdeltaV only work when there is constant pressure and when the reaction is irreversible?

Jeremiah Hutauruk

How is a bomb calorimeter an isolated system?

Jeremiah Hutauruk

thank you so much!

Jeremiah Hutauruk

thanks!

Jeremiah Hutauruk

did lavelle post the midterm locations? #asap

Jeremiah Hutauruk

9.9 Calculate the entropy change associated with the isothermal expansion of 5.25 mol of ideal gas atoms from 24.252 L to 34.058 L.

Jeremiah Hutauruk

9.3 (a) Calculate the change in entropy of a block of copper at 25 C that absorbs 65 J of energy from a heater. (b) If the block of copper is at 100. C and it absorbs 65 J of energy from the heater, what is its entropy change? (c) Explain any difference in entropy change.

Jeremiah Hutauruk

9.1 A human body generates heat at the rate of about 100. W (1 W 1 J s 1). (a) At what rate does your body heat generate entropy in your surroundings, taken to be at 20. C? (b) How much entropy do you generate each day? (c) Would the entropy generated be greater or less if you were in a room kept at...

Jeremiah Hutauruk

8.41 A 50.0-g ice cube at 0.0 C is added to a glass containing 400.0 g of water at 45.0 C. What is the nal temperature of the system (see Tables 8.2 and 8.3)? Assume that no heat is lost to the surroundings.

Jeremiah Hutauruk

8.61 Calculate the reaction enthalpy for the synthesis of hydrogen bromide gas, H2(g) Br2(l) S 2 HBr(g), from the following data:
NH 1g2 HBr1g2 ¡ NH Br1s2 34
¢H° 188.32 kJ N 1g2 3 H 1g2 ¡ 2 NH 1g2 ¢H° 92.22 kJ
223
N 1g2 4 H 1g2 Br 1l2 ¡ 2 NH Br1s2
2 2 2 4
¢H° 541.66 kJ

Jeremiah Hutauruk

8.73 Use the bond enthalpies in Tables 8.6 and 8.7 to estimate
the reaction enthalpy for
(a) 3 C2H2(g) ¡ C6H6(g)
(b) CH4(g) 4 Cl2(g) ¡ CCl4(g) 4 HCl(g) (c) CH4(g) CCl4(g) ¡ CHCl3(g) CH3Cl(g)

Jeremiah Hutauruk

8.15 In an adiabatic process, no energy is transferred as heat. Indicate whether each of the following statements about an adiabatic process in a closed system is always true, always false, or true in certain conditions (specify the conditions): (a) U 0; (b) q 0; (c) q 0; (d) U q; (e) U w.

Jeremiah Hutauruk

8.13 In a combustion cylinder, the total internal energy change produced from the burning of a fuel is 2573 kJ. The cooling system that surrounds the cylinder absorbs 947 kJ as heat. How much work can be done by the fuel in the cylinder?

Jeremiah Hutauruk

final* not nal

Jeremiah Hutauruk

A piston con nes 0.200 mol Ne(g) in 1.20 L at 25 C. Two experiments are performed. (a) The gas is allowed to expand through an additional 1.20 L against a constant pressure of 1.00 atm. (b) The gas is allowed to expand reversibly and isothermally to the same nal volume. Which process does more work?

Jeremiah Hutauruk

12.25 Calculate the initial molarity of Ba(OH)2 and the molarities of Ba2 , OH , and H3O in an aqueous solution that contains 0.43 g of Ba(OH)2 in 0.100 L of solution.

Jeremiah Hutauruk

11.73 State whether reactants or products will be favored by an increase in the total pressure (resulting from compression) on each of the following equilibria. If there is no change, explain why that is so. (a) 2 O3(g) ∆ 3 O2(g) (b) H2O(g) C(s) ∆ H2(g) CO(g) (c) 4 NH3(g) 5 O2(g) ∆ 4 NO(g) 6 H2O(g) ...

Jeremiah Hutauruk

11.53 A reaction mixture that consisted of 0.400 mol H2 and 1.60 mol I2 was introduced into a 3.00-L ask and heated. At equilibrium, 60.0% of the hydrogen gas had reacted. What is the equilibrium constant K for the reaction H2(g) I2(g) ∆ 2 HI(g) at this temperature?

Jeremiah Hutauruk

11.71 The four gases NH3, O2, NO, and H2O are mixed in a reaction vessel and allowed to reach equilibrium in the reaction 4 NH3(g) 5 O2(g) ∆ 4 NO(g) 6 H2O(g). Certain changes (see the following table) are then made to this mixture. Considering each change separately, state the effect (increase, decr...

Jeremiah Hutauruk

11.43 Consider the reaction 2 NO(g) ∆ N2(g) O2(g). If the initial partial pressure of NO(g) is 1.0 bar, and x is the equilibrium concentration of N2(g), what is the correct equilibrium relation? (a) K x2/(1.0 x); (b) K x2; (c) K x2/(1.0 2x)2;
(d) K 4x3/(1.0 2x)2; (e) K 2x/(1.0 x)2.

Jeremiah Hutauruk

11.15 (a) Calculate the reaction Gibbs free energy of I2(g) S 2 I(g) at 1200. K (K 6.8) when the partial pressures of I2 and I are 0.13 bar and 0.98 bar, respectively. (b) What is the spontaneous direction of the reaction? Explain briefly.

Jeremiah Hutauruk

12.65 Determine whether an aqueous solution of each of the following salts has a pH equal to, greater than, or less than 7. If pH 7 or pH 7, write a chemical equation to justify your answer. (a) NH4Br; (b) Na2CO3; (c) KF; (d) KBr; (e) AlCl3;
(f) Cu(NO3)2.

Jeremiah Hutauruk

"12.127 The two strands of the nucleic acid DNA are held together by hydrogen bonding between four organic bases. The structure of one of these bases, thymine, is shown below. (a) How many protons can this base accept? (b) Draw the structure of each conjugate acid that can be formed. (c) Mark w...

Jeremiah Hutauruk

"12.119 Draw the Lewis structure of boric acid, B(OH)3. (a) Is resonance important for its description? (b) The proton transfer equilibrium for boric acid is given in a footnote to Table 12.1. In that reaction does boric acid act as a Lewis acid, a Lewis base, or neither? Justify your answer by...

Jeremiah Hutauruk

"17.31 Use the information in Table 17.4 to write the formula for each of the following coordination compounds:
(d) sodium bisoxalato(diaqua)ferrate(III)"

Jeremiah Hutauruk

Are we required to memorize names for each anionic and neutral ligands?

Jeremiah Hutauruk

"17.37 With the help of Table 17.4, determine the coordination number of the metal ion in each of the following complexes:
(d) [Cr(edta)] "

Jeremiah Hutauruk

4.19 Predict the shapes and estimate the bond angles of (a) the thiosulfate ion, S2O32 ; (b) (CH3)2Be; (c) BH2 ; (d) SnCl2.

Jeremiah Hutauruk

4.75 An organic compound distilled from wood was found to have a molar mass of 32.04 g·mol 1 and the following composition by mass: 37.5% C, 12.6% H, and 49.9% O. (a) Write the Lewis structure of the compound and determine the bond angles about the carbon and oxygen atoms. (b) Give the hybridization...

Jeremiah Hutauruk

4.45 Describe the structure of the formaldehyde molecule, CH2O, in terms of hybrid orbitals, bond angles, and - and -bonds. The C atom is the central atom to which the other three atoms are attached.

Jeremiah Hutauruk

4.91 Benzyne, C6H4, is a highly reactive molecule that is detected only at low temperatures. It is related to benzene in that it has a six-membered ring of carbon atoms; but, instead of three double bonds, the structure is normally drawn with two double bonds and a triple bond. (a) Draw a Lewis stru...

Jeremiah Hutauruk

4.43 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 or decrease as the s-character of the hybrids is increased?

Jeremiah Hutauruk

Acrylonitrile, CH2CHCN, is used in the synthesis of acrylic fibers (polyacrylonitriles), such as Orlon. Write the Lewis structure of acrylonitrile and describe the hybrid orbitals on each carbon atom. What are the approximate values of the bond angles?

Jeremiah Hutauruk

"Methane, the most abundant hydrocarbon in the atmosphere, is slowly oxidized in the air to carbon dioxide. Both compounds contribute to global warming, with CH4 more potent than CO2. An intermediate in the oxidation of methane to carbon dioxide is HOCO. (a) Draw the Lewis structure for this co...

Jeremiah Hutauruk

''3.103 Quinone, C6H4O2, is an organic molecule with the structure shown below; it can be reduced to the anion C6H4O22 . (a) Draw the Lewis structure of the reduced product. (b) On the basis of formal charges derived from the Lewis structure, predict which atoms in the molecule are most negatively c...

Jeremiah Hutauruk

''In 1999, Karl Christe synthesized and characterized a salt that contained the N5 cation, in which the ve N atoms are connected in a long chain. This cation is the rst all-nitrogen species to be isolated in more than 100 years. Draw the most important Lewis structure for this ion, including all equ...

Jeremiah Hutauruk

3.87 Which do you predict to have the strongest CX bond, where X is a halogen: (a) CF4, (b) CCl4, or (c) CBr4? Explain.

Jeremiah Hutauruk

3.61 Determine the numbers of electron pairs (both bonding and lone pairs) on the iodine atom in (a) ICl2 ; (b) ICl4 ;
(c) ICl3; (d) ICl5.

Jeremiah Hutauruk

Write 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 also called wood alcohol; (c) glycine, H2C(NH2)COOH, the simplest of the amino ...

Jeremiah Hutauruk

2.47 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 1 ion: (a) Ge; (b) Mn; (c) Ba; (d) Au.

Jeremiah Hutauruk

2.85 In the heavier transition-metal elements, especially the lanthanoids and actinoids, there are numerous exceptions to the regular order of orbital occupation predicted by the building- up principle. Suggest why more exceptions would be noted for there elements.

Jeremiah Hutauruk

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.

Jeremiah Hutauruk

For Shrodinger Equation, how do we apply this on the test if we are said not to compute any actual numbers?

Jeremiah Hutauruk

It says "1.55 Infrared spectroscopy is an important tool for studying vibrations of molecules. Just as an atom can absorb a photon of suitable energy to move an electron from one electronic state to another, a molecule can absorb a photon of electromagnetic radiation in the infrared region to m...

Jeremiah Hutauruk

It says "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?"

Jeremiah Hutauruk

It says "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?"

Jeremiah Hutauruk

It says " Infrared spectroscopy is an important tool for studying vibrations of molecules. Just as an atom can absorb a photon of suitable energy to move an electron from one electronic state to another, a molecule can absorb a photon of electromagnetic radiation in the infrared region to move ...

Jeremiah Hutauruk

It says "What is the minimum uncertainty in the speed of an electron con ned to 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."

How do I start this problem?

Jeremiah Hutauruk

Can someone explain how to apply sig figs in addition/subtraction and multiplication/division?

Please and thank you.

Jeremiah Hutauruk

It says "M.19 A stimulant in coffee and tea is caffeine, a substance of molar mass 194 g mol 1. When 0.376 g of caffeine was burned, 0.682 g of carbon dioxide, 0.174 g of water, and 0.110 g of nitrogen were formed. Determine the empirical and molecular formulas of caffeine, and write the equati...

Jeremiah Hutauruk

The question is "F.19 Caffeine, a stimulant in coffee and tea, has a molar mass of 194.19 g mol 1 and a mass percentage composition of 49.48% C, 5.19% H, 28.85% N, and 16.48% O. What is the molecular formula of caffeine?" What is the first step of this problem and why is the molar mass nee...

Search found 67 matches