Friday
October 28, 2016

# Posts by jo

Total # Posts: 465

Chemistry
What chemical feature in the protein dictates the local secondary structure? α-helix β-pleated sheet random coils amino acid sequence pH hydrogen bonding
May 31, 2013

Chemistry
Why does the equation Co(H2O)6 + 4Cl <------> CoCl4 + 6H2O shift left when cooled?
May 1, 2013

A- 14H + 6Fe^2+ + Cr2O7^2- --> 6Fe^3+ + 2Cr ^3+ + 7H2O B- 3N2H4 +4Cl03- --> 6NO2+ 12Cl- + 6H2O This was all I was able to come up with, am I at lease headed in the right direction?
April 25, 2013

Balance the following redox reaction and identify the oxidizing and reducing agents A- Fe2+(aq) + Cr2072-(aq) -->Fe3+(aq) + Cr3+(aq) (acidic) B- N2H4(g) + ClO3-(aq) -->NO2(g) + Cl- (basic)
April 25, 2013

Calculate the molar solubility of silver chloride (AgCl) in: a-deionized water and b-.20M NaCl solution Given Ksp=1.6*10^-10
April 25, 2013

Chemistry
Balance the following redox reaction and identify the oxidizing and reducing agents A- Fe2+(aq) + Cr2072-(aq) -->Fe3+(aq) + Cr3+(aq) (acidic) B- N2H4(g) + ClO3-(aq) -->NO2(g) + Cl- (basic)
April 25, 2013

chemistry
Calculate the molar solubility of silver chloride (AgCl) in: a-deionized water and b-.20M NaCl solution Given Ksp=1.6*10^-10 please show work.
April 25, 2013

CALCULUS
Let the line l0 be defined by x = 1−t, y = 2+3t, z = 1−2t. Determine whether each given line intersects l0. If it does, give the intersection point. l1 :x=2+t, y=5−2t, z=1+3t l2 :x=6+2t, y=1+t, z=5+t
April 24, 2013

books
I need to write a Year 9 English Unit on the novel,"Strange Objects" by Gary Crew. I can't seem to find any resources to assist me. Can you help direct me to finding some???? thanks
April 23, 2013

CHEMISTRY
Suppose a student adds 25.00 mL of 1.025 M HCl to a 1.50 g antacid tablet. The student boils and then titrates the resulting solution to the endpoint with 0.4969 M NaOH. The titration requires 21.3 mL NaOH to reach the endpoint. How many moles of HCl were neutralized by the ...
April 23, 2013

CHEMISTRY
If a tablet contains 129 mg of Mg(OH)2 and 505 mg of CaCO3, how many moles of HCl would theoretically be neutralized?
April 22, 2013

Chemistry
You titrate a 10.0 mL sample of phosphoric acid with a 1.65 M solution of the base potassium hydroxide. It takes 7.55 mL to reach the endpoint of the titration. What is the molar concentration of the original solution of phosphoric acid? 3KOH + H3PO4 --> K3PO4 + 3H2O
April 13, 2013

Chemistry
A 10 mL sample of 1.5 M Potassium Phosphate is placed in a 100 mL volumetric flask and diluted to the mark. What is the Molar concentration of Potassium ions in this diluted solution?
April 11, 2013

chemistry/science
That is the question that I was given for homework and it stumped me also. Is it possible that the answer is transition metals. I looked on the periodic chart and found that that is what was possibly inside it. I am confused. Wondering if you could clarify the answer??
April 4, 2013

chemistry/science
What are the groups of atoms inside iron called?
April 4, 2013

physics
A slide is 5 inches high. it is placed 5.5 inches from the convex lens of a porjection lantern. The image is cast upon a screen 55 inches away. the focal length of the lens is ______inches? b) the heigh of the image cast by the lens is ________inches?
March 19, 2013

Algebra 2
Sidewalk of uniform width has area of 180 ft squared and is surrounded ny a flower bed that 11 ft wide and 13 ft long. Find the width of the sidewalk?
March 17, 2013

ecology
During the demographic transition of the eighteenth century, humankind led advances in mortlity and economy, leading to a prosperous population growth. What types of resources are necessary for population change and how might the availability of resources in different ...
March 14, 2013

sociology
There is a disparity between theory and direct observation. Because theories are based on observations, how are these theories first developed in the absence of direct observations?
March 14, 2013

chemistry
A sample of chlorine gas is collected by water displacement at 23C. If the atmospheric pressure is 751 torr, what is the partial pressure due to the chlorine?
March 14, 2013

chemistry
To raise the temperature of 200.8 g of water from 50.00 °C to 60.00 °C requires how much heat?
February 28, 2013

algebra
lura has 4 yards of material.she is making clothes for her doll. each dress requires 1/6 yards of material. how many dresses will she be able to make?
February 27, 2013

math
A piece of cardboard measure 12ft by 12ft. Corners are to be cut from it as shown by the broken lines, and the sides folded up to make a box with an open top. What size corners should be cut from the cardboard to make a boxx with the greatest possible volume.
February 27, 2013

science
What is the term used to describe making older buildings more resistant to earthquakes?
February 25, 2013

3.duermo 4.devuelve 5.podemos 6.cuentan 7.cuestan 8. vuelve 9.encuentras 10. almorzamos Your answers are correct
February 25, 2013

math
i am trying find out how you would find the height of a rectangular prism if the surface area is 100 and length is 10 and width is 6. if someone can get me started on the right way it would help ?
February 18, 2013

CRT205
I am having difficulty finding/locating the rhetorical devices within the article. This assignment has really stumped me ... :-/
February 17, 2013

CRT205
Option 1: Article Review Choose one newspaper editorial and one magazine article from the lists provided by your instructor and write a 250- to 350-word response to the following: • What rhetorical devices are found in each article? • Based on their characteristics, ...
February 17, 2013

Algebra Problem Solving
Denise's cell phone plan is $29.95 per month plus$.10 per minute for each minute over 300 minutes of call time. Denise's cell phone bill is \$99.95. For how many minutes was she billed? Answer is 700 but what is the algebraic equation?
January 29, 2013

Math
There are18 boys and 20 girls in a class. What is the ratio of girls to boys?
January 27, 2013

math
i need someone to show the formula for this problem and amswer i have 16 not sure sally's art project is in the shape of a circle. she wants to put a piece of glitter string around the adge of her project has a radius of 4 inches, how much string will she need?
January 27, 2013

the facility study unit
aesthe tics is concemed with matters such
January 17, 2013

math
The sale on a map is 1 inch=12 feet. What is the actual distance between two points that are are 8 1/2 inches apart
January 10, 2013

geometry
Three security cameras were mounted at the corners of a triangular parking lot. Camera 1 was 151 ft from camera 2, which was 122 ft from camera 3. Cameras 1 and 3 were 139 ft apart. Which camera had to cover the greatest angle?
January 4, 2013

Algebra 2
How do i get the perfect square of: 3x^2+7x=-9
December 20, 2012

Division
If you have 43 marbles. You divide them equally among some sacks. How many sacks must you use to get fewer than 8that marbles in each sack?
December 13, 2012

Division
If you have 43 marbles. You divide them equally among some sacks. How many sacks must you use to get fewer than 8that marbles in each sack?
December 13, 2012

math
help me with missing number input 1 2 3 4 5 output, 2 , 5, 10, ?,26
December 8, 2012

physic
final=22.4J 22.4J/ 61.3J (initial)
December 5, 2012

chemisty
NaOH + HCl -> NaCl + H2O What is the molarity of a NaOH solution that required 31.6mL to neutralize 25.0mL of a 0.145 M HCl solution?
December 5, 2012

chemisty
12.00 liters of oxygen gas is under a pressure of 20 mm Hg. If the volume of this gas is decreased to 2.00 liters at constant temperature, what will the new pressure be? I believe this is Boyle's law and the answer should be 120 mm Hg, but according the answer on practice ...
December 4, 2012

chemistry
12.00 liters of oxygen gas is under a pressure of 20 mm Hg. If the volume of this gas is decreased to 2.00 liters at constant temperature, what will the new pressure be? I believe this is Boyle's law and the answer should be 120 mm Hg, but according the answer on practice ...
December 4, 2012

chemistry
Reaction: Na2CO3 + 2 HCl -> 2 NaCl + CO2 + H2o How many grams of NaCl can be produced from the reaction of 1.35g of Na2CO3 with 125mL of 0.265 M HCl?
November 30, 2012

CHEMISTRY
Cant figure this out, I feel like the answer I keep getting is way too low. A voltaic cell is constructed that is based on the following reaction: Sn2+ (aq) +Pb(s) = Sn(s) + Pb2+ (a) If the concentration of Sn2+ in the cathode compartment is 1.00M and the cell generates an emf...
November 30, 2012

Chemistry
THANK YOU!
November 29, 2012

Chemistry
Hi everyone, I have been trying to figure out this titration equation all day and for some reason I am stumped. Here is the question in full: Potassium hydrogen phthalate, KHP, can be obtained in high purity and is used to determine the concentrations of solutions of strong ...
November 29, 2012

Language
What part of speech are the following words this, of, books, sighed, heavily, doctor,ask, you, address, auscultated, are, bruits, read, last, and, my, will follow up, yesterday, tomorrow, gift, call it, present, always, on
November 14, 2012

Pre-calculus
A sailboat leaves port and sails for 7 miles NE and then 9 miles NW. If the speed remains constant, what bearing would take the sailboat home?
November 13, 2012

Dimension Personal Education
Junior plan to travel this summer with Oscar and I
November 10, 2012

Math
A farmer has 20 pigs ans sheep.he has 6 fewer sheep than pigs. How many pigs does he have?
November 7, 2012

Chemistry
Answer is 1.104L Oh remember that there are 0.028 mol in 1.88g of NaN2. Final, in 0.028mol of NaN3, there is 0.042 mol of N2. This is your n. so, V= ( nRT)/P remember, you are given R, T and P Hope this helps:)
November 2, 2012

Chemistry
November 2, 2012

HOW TO STARE YOUR DAY CARE FACILIY
THE LARGEST NON PROFLT ASSOCIATION IN THE UNITED STATES REPRESENTION EARLY CHILDHOOD EDUCATION IS THE
October 30, 2012

chil development
keeping systematic record of observations of children provid useful information for
October 23, 2012

Yes,yes :)
October 21, 2012

math
Can you show 2 hundredths using only tenths place value blocks?
October 18, 2012

child development
agood technique to prevent children from talking to you while you,re observing is to.
October 17, 2012

Biology
Inducible
October 9, 2012

world history
Conversion of kings and other elite figures
October 6, 2012

Shelving units
The average thikness of a medical chart is 1/4 inch. If a practice has 1200 patients with each chart 1/4 inch thick, how many shelving units will it take if a unit can hold 368 inches.
September 27, 2012

math
there Are four children in a family, the sum of the squares of the ages of the three youngest children equals the square of the age of the oldest child. How old are all the children.
August 28, 2012

Calc
A paper cup is to be designed in the shape of a right circular cone. It must have a capacity of 12 fluid ounces (1 fluid ounce = 1.80469 cubic inches) of soft drink but it must use a minimum amount of material in its construction. What should the dimensions of this paper cup ...
July 30, 2012

Chemistry
Use Ksp to find the concentration of an ion in a saturated solution. Consider a 2.50E-3 M solution of Al2(SO4)3. (a) What [OH^-] is required to initiate precipitation of Al^3+ from the solution? (b) What [OH^-] is required to lower the [Al^3+] to 2.00E-7 M ?
July 28, 2012

Chemistry
Given a diprotic acid, H2A, with two ionization constants of Ka1 = 3.9× 10–2 and Ka2 = 5.9× 10–8. Calculate the pH and molar concentrations of each protonated form for a: (a)0.135 M solution of H2A pH= [H2A]= [HA]= [A2-]= (b)0.135 M solution of NaHA pH= [...
July 21, 2012

Chemistry
I'm not getting the right answers for the pH, [H2A], and [HA^-] in part a (0.135 M solution for H2A) For H2A, I did 3.9E-2=x^2/(.135-x) Using the quadratic formula: x^2+.039x-.005265=0 x=.06725 [H^+]=[HA^-]=.06725 M pH=-log(.06725)=1.17 Finding [H2A]=.135 M-.06725 M=.06775...
July 21, 2012

Chemistry
Given a diprotic acid, H2A, with two ionization constants of Ka1=3.9E-2 and Ka2=5.9E-8. Calculate the pH and molar concentration of each protonated form for a 0.135 M solution of: (a) H2A (b) NaHA (c) Na2A
July 21, 2012

algebra
equivalent expression for 2log(x+1)-2log(x-1)-log(x-1)
July 5, 2012

science
two tall buildings are 200m apart .with what speed must a ball be thrown horizontally from the window 540 m above the ground in one building, so that it will enter a window 50m above the ground in the other?
July 1, 2012

statistics
how large a sample size is needed for 2 sided 95% confidence interval to have a length of 2 weeks when mean is 3.6
June 28, 2012

physics
a missile is launched an angle of 26.5 with respect to the horizontal. if it travels in the straight line over the level Terran for 2 minute and its average speed is 6000 mile per hour. what is its altitude?
June 23, 2012

physics
a television antenna is on the roof of the building. from a pt. on the ground 36.0 feet from the building , the angle of elevation of the top and the bottom of the antenna are 51 degree celsiusand 42 degree celsuis respectively. how tall is antenna?
June 23, 2012

physics
m1/m2
May 11, 2012

Calculus help~!
Which is the standard form of the equation with p = 26, O= 3pi/4 ? SQRT2x – SQRT2y = 0 SQRT2x – SQRT2y + 52 = 0 SQRT2x + 52 = 0 SQRT2x + 52y = 0
May 8, 2012

algebra
the product of two consecutive even integersis 34 less than 7 times their sum.find the two integers.
May 7, 2012

algebra
One number is 10 more than twice another.Their product is 10 more than twice their sum.Find the numbers.
May 7, 2012

HISTORY
thank you bobpursley!
May 4, 2012

HISTORY
In 2001, President George W. Bush signed the Economic Growth and Tax Relief Reconciliation Act of 2001 (EGTRRA). This bill called for large tax cuts just as the Economic Recovery Act of 1981 had and largely benefited the wealthiest Americans. President Bush’s approach to...
May 4, 2012

english
this summer I will be going to a theme park with my best friend will go too. It will be fun. Because I like when I get to go with friends. I've never been to this theme park before I heard it is very fun. Someone in my class. ITold me that there is a rollercoaster that is ...
May 1, 2012

Chemistry
Find the molecular formula of a compound that is 48.38% carbon, 8.12% hydrogen, and 53.5% oxygen by mass and has a molecular weight of 328 g/mol.
April 23, 2012

Chemistry
A 15mL sodium hydroxide solution of unknown concentration is titrated with 34.5 mL of 1.2M HCl solution. What was the concentration of the sodium hydroxide solution?
April 23, 2012

Chemistry
A 12 mL sample of 0.4 M silver nitrate solution is mixed with 8 mL of 0.8 M sodium chloride solution. Determine the identity of precipitate and the number of grams produced.
April 23, 2012

Math
Math huron scored 84% on her last history test. Of she got 21 answers correct , how many question did the test have?
April 15, 2012

Math
Math huron scored 84% on her last history test. Of she got 21 answers correct , how many question did the test have?
April 15, 2012

accounting
which one of the following contingencies must be accrued on the balance sheet
April 8, 2012

physics
faaaanx -xoxoa jo h.
March 23, 2012

chemistry
hello i'm doing a redox stoichiometry lab having to do with titration 6H +5H2O2 + 2MnO4 -- 5O2 + 2Mn2+ + 8H2O Why is H2O2 the source of O2 product in this titration?
March 22, 2012

englsih
in the poem the sloth by theodore roethke is there any personification, alliteration, imagery or onomatopoeia
March 13, 2012

Math
How many lines of symmetry does a regular decagon have? 0 5 10 20 I believe the answer is 10. Thanks for the help :)
March 13, 2012

Physics
The pulley system shown in the figure is used to lift a 52-{\rm kg} crate. Note that one chain connects the upper pulley to the ceiling and a second chain connects the lower pulley to the crate. The crate is rising with an acceleration of 2.5 m/s^2. Determine the tension in ...
March 10, 2012

chem
how do you tell which reactant is limiting reactant with the following information: mass of cup 55.78g mass o/sodium bicarbonate 1.01g mass o/citric acid 1.52g toal mass 58.31g mass of cup,solute after reaction 59.95g mass o/carbon dioxide .42g H3C6H5O7(aq) + 3 NaHCO3(aq) &#...
March 9, 2012

The word 'of' means to multiply. 3/5 of 10 3/5 X 10 = 30/5 = 6 1/3 of 12 1/3 X 12 = 12/3 = 4 hope this helps.
March 5, 2012

Math
3:18 9:54 and 6:36 Notice how you have to multiply the first number by 6 to get the second number. Hope this helps!
March 5, 2012

math
360/18 = x/1 One is the unit rate. Find X. 18 divide by 18 equals one. So take the 360 and divide by 18 which equals 20. Therefore x = 20. Hope this helps.
March 5, 2012

1.772453851(and then some more)
March 5, 2012

math
(1)Look at a ruler on the inches side. Notice between the zero and one there are little dashes. There should be 16 betweeen zero and one. 16 between one and two... Each dash is a sixteenth. So every other one is an eighth. (2) You want 10 inches out of 12 inches. Therefore 10/...
March 5, 2012

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