Answers created by Professor Sam
 Back to user's profile

Next

Question #522dd

Question #6fa5d

Using the Pka' Values for glutamic acid (pk1= 2.19, pk2= 9.67, pkR= 4.25) indicate the ionic form which predominates at:
a) pH 1.0
b)pH 7.0
c) pH13
d) What is the net charge of the predominant form at each of these pH's?

How were the shapes of s, p, d, and f orbitals determined? How did they get their names of s, p, d, and f?

Show that lim x>a (x^3/8a^3/8)/(x^5/3a^5/3)?

Question #277d6

Organic Chemistry Predict the product(s)?

#lim_(x>pi/2)(sinx)^(1/sin(2x)) = #?

When 1,3 butadiene is treated with HBr in the presence of peroxides and light at very low temperatures two major products are produced how do you draw the 2 resonance structures for the intermediate radical and the final products?

Question #9d462

Question #2f5d1

Question #567d4

Question #933f2

Question #9d1db

Question #4d7d2

Question #95007

What is the solubility of #AgBr# in a solution of #AgBr# and #AgSCN#?
Given #rarr#
#K_("sp AgSCN") =10^(12)#
#K_("sp AgBr")=5xx10^(13)#
Thank you:)

Question #c209b

Question #b9657

Question #b9657

What are the reactions for amines and amides?

What are the reactions for amines and amides?

Question #99ec0

Question #defa1

Question #c6802

For the nucleophilic aromatic substitution (NAS) reaction of 1chloro2,4dinitrobenzene with methoxide in methanol, what does the intermediate look like?

Question #b5582

Question #2927d

How would you explain the electrophilic aromatic substitution with a diagram of a reaction mechanism?

Question #bace7

Question #0f057

Question #04f3c

Question #d97c6

Question #346a8

Question #3dd79

Question #68518

How many unpaired electrons are in a copper atom?

A photon having #lambda = 854*10^(10) m# causes the ionization of a nitrogen atom. Give the I.E. per mole of nitrogen in KJ?

Despite the large difference in electronegativity between #"Si"# and #"F"#, #"SiF"_4# has a boiling point lower than that of #"NH"_3# (#86^@ "C"#, vs. #33^@ "C"#). Why is that? Could it be due to the symmetry? Hydrogenbonding?

What is the maximum number of electrons that can occupy the #l = 4# subshell? What are the possible sets of 4 quantum numbers for an electron in #n = 4# orbitals?

What temperature range are most elements on the periodic table liquids and how many would be liquids?

Question #edab3

How do increases in temperature affect the density of ocean water?

Why is the modernday quantum model of the atom better than John Dalson's model?

How is the wave speed of a string the same as calculating the speed using kinematics?

Which is a better Lewis acid, #"AlCl"_3# or #"BCl"_3#?

Question #dda99

What is the concentration of hydrogen ions in a solution of pH = 4.0?

Question #183d5

What are the orders of #"CV"^(+)# and #"OH"^()# for the reaction #"CV"^(+)(aq) + "OH"^()(aq) > "CVOH"(aq)#?

Sea water contains #65 xx10^3# #"g/L"# of bromide ions. If all the bromide ions are converted to produce #Br_2#,how much sea water is needed to prepare 1 kg of #Br_2#?
please tell the method.

what is the difference between the reactivity and abundance of elements in Group 3A through Group 8A?

Question #a7e3f

What is the period of a pendulum near Earth's surface that is 130 cm long?

Question #6e25b

How do you solve #x3y= 15# and #2x+7y= 36# using substitution?

Question #31c81

Question #49a06

How do you solve #2x ^ { 2}  25x = 0#?

How do you solve #\frac { 4m + 7} { m + 10} = \frac { m } { 2} + \frac { 11} { 2m + 20}#?

How do you solve #6 + 2(3j  2) = 4(1 + j) #?

Why is Osmium with atomic number 76 the densest element and twice a dense as lead with atomic number 82?

Question #80a54

What is the kinetic energy for one electron whose wavelength is #"650 nm"#? Its rest mass is #9.109 xx 10^(31) "kg"#.

Question #5b2a9

Question #287c9

Question #8711a

How do you convert 32° Fahrenheit to Celsius?

How much heat is released when 2.00 kg of aluminum solidifies? How many kJ is this?

Question #bbed8

How would I do a calculation for an electroplating of solid metal onto the cathode in an electrolytic cell if, say, I am given current and the time that it took? What helps increase the mass yielded?

0.2 mole of A and 0.4 mile of B were reacted at a certain temperature and allowed to come to equilibrium .
A+B2AB
The equilibrium mixture contained 0.1 mole of A, find Kc if volume of the container was 2 dm^3?

Question #8b42e

Question #0d50a

How much heat is absorbed by a 2000 kg granite boulder as energy from the sun causes its temperature to change from 10°C to 29°C?

Question #3ca57

Question #e954f

Question #6cd6a

Balance this reaction using ion electron method in shortest way possible . but must be clear ..
#Fe^(2+)+MnO_4^()+H^(+) > Fe^(3+)+Mn^(2+)+H_2O#
?

A weightlifter carefully lowers a 150 kg mass from a height of 1.5 m to the floor in 5 seconds. How much power is used?

A jogger runs in a straight line with an average
velocity of 4.7 m/s for 3.3 min, and then with
an average velocity of 5.8 m/s for 4.4 min.
What is her average velocity?

An object travels North at #6 m/s# for #4 s# and then travels South at #3 m/s# for #5 s#. What are the object's average speed and velocity?

A desk is 3.35 m below an 1850lm incandescent lamp. What is the illumination on the desktop?

An #8 L# container holds #8 # mol and #9 # mol of gasses A and B, respectively. Every two molecules of gas B bind to one molecule of gas A and the reaction raises the temperature from #370^oK# to #425 ^oK#. How much does the pressure change by?

Given the following data, what is the enthalpy associated with the given equation?
##

An object is thrown vertically from a height of #2 m# at #2 m/s#. How long will it take for the object to hit the ground?

How many joules of potential energy does a 1kg book gain when it is elevated 4 m? When it is elevated 8 m?

What is the moment of inertia of a pendulum with a mass of #7 kg# that is #5 m# from the pivot?

Question #8f73c

Question #8c957

Question #b773e

How do you find the E_cell given standard E_cell, Molarity, and the chemical reaction equation?

Question #70b01

CsBr crystallises in a bodycentred cubic (bcc) lattice. The unit cell lengt is 436.6pm. Given that the atomic mass of Cs= 133u and that of Br=80u. What will be the density of CsBr?
a) 0.425g/cm^3
b) 8.25g/cm^3
c) 42.5g/cm^3
d) 4.25g/cm^3

Question #593b2

If you did not add sugar, would the ice cream freeze faster or slower? Why?

What will be the pH of the solution that results from the addition of 20mL of 0.01M Ca(OH)2 to 30mL of 0.01M HCl?

Question #ae5d8

A positive Seliwanoff's test is obtained with?
A] Glucose B] Fructose C] Galactose D] Mannose

Question #9b0c6

Next