Monday
September 26, 2016

Posts by maria

Total # Posts: 1,892

chemistry
Calculate energy change taht produced the 4th line in lyman series
September 26, 2016

Chemistry
Please help...entrance exam soon Write the oxidation and reduction half reactions(showing e- lost or gained) for the foll O3 + I- -> IO3- + O2 (acidic)
September 24, 2016

Math
It's a riddle question. All six digits in the number even remember that zero is an even number one digit is use once and all the other digits is used twice is four times the hundreds digit 10 digit is the difference of the ones digit in the hundred digit is the same digit ...
September 21, 2016

Math
It's a riddle question. All six digits in the number even remember that zero is an even number one digit is use once and all the other digits is used twice is four times the hundreds digit 10 digit is the difference of the ones digit in the hundred digit is the same digit ...
September 21, 2016

Math HELP HELP
(a+4b,a-b) and (a-3b,a) find the length of the line segment joining this pair of points.
September 21, 2016

Math
(a+4b,a-b) and (a-3b,a) find the length of the line segment joining this pair of points.
September 20, 2016

Culturel Diversity
Talking the talk emphasizes the use of lableing individuals positivly
September 18, 2016

Chemistry
CHCl3 + MnO4- = Cl2 + CO2 + Mn+2 Balance the above with half reactions in acidic medium. For the above reaction, can you please show the half reactions...which is getting oxidised...both C and Cl's oxidation # are changing showing both getting oxidised,.how is this ...
September 16, 2016

CHEMISTRY
BALANCE THE REDOX REACTION USING HALF CELL METHOD IN AN ACIDIC MEDIUM CHCl3 + MnO4- = Cl2 + CO2 + Mn+2
September 15, 2016

Chemistry
Half reaction method of balancing redox reaction CHCl3 + MnO4- = Cl2 + CO2 + Mn+2
September 15, 2016

Math
24 dogs line up for breakfast. The first cat eats one fish, the second cat eats two fish, and so on, with each cat eating one more fish than the one before it. How many fish are eaten in total.
September 15, 2016

Social studies
Type of American Indian dwelling in the Eastern Woodlands
September 12, 2016

English
Man-Made
September 12, 2016

chimistry
natriumsaltet
September 10, 2016

chimistry
hvorfor løsligheten av natriumsaltet til salsyre vann
September 10, 2016

chemistry
a) What is fellesioneffekten?   Veronal is a barbiturate (structure see above). Barbiturates is a substance class which occur in a variety of drug classes, including sleep medications (hypnotikasedativa), in painkillers (anesthetics) and anticonvulsants. A barbiturate is ...
September 9, 2016

chemistry
a) What is fellesioneffekten?   Veronal is a barbiturate (structure see above). Barbiturates is a substance class which occur in a variety of drug classes, including sleep medications (hypnotikasedativa), in painkillers (anesthetics) and anticonvulsants. A barbiturate is ...
September 9, 2016

chemistry
In quality control of raw materials for pharmaceutical production often used foul reactions to prove that raw materials in salt form containing the appropriate salt. Hydrochloride (eg. Amitriptyline hydrochloride) can be detected for example by precipitating the chloride ions...
September 9, 2016

chemistry
Cocaine is a weak base (Figure see below) with pKb = 5.59. Cocaine has local anesthetic effect (local anesthetic) but is also a narcotic.   a) Calculate the ratio of the concentration of cocaine and its conjugated acid in a solution which has. pH = 7.40 (that of blood) ...
September 9, 2016

chemistry
To create a 0.1 M carbonate buffer pH = 10.2. You choose to use a combination of HCO3- / CO32-. This buffer system has pKa = 9.9.   a) Calculate how much you need to weigh in each of the sodium salts, NaHCO3 and Na2CO3, to create 1.0 L carbonate (with total concentration ...
September 9, 2016

chemistry
a) Hva er fellesioneffekten? Veronal er et barbiturat (struktur se over). Barbiturater er en stoffklasse som forekommer i en rekke legemiddelgrupper, blant annet i sovemedisiner (hypnotikasedativa), i smertestillende (anestetika) og i antiepileptika. Et barbiturat er en svak ...
September 9, 2016

chemistry
Calculate the pH reaches 30.0 mL one 0.200 M solution of HCl salt of amitriptyline is added 100.0 mL of a NaOH solution of concentration 80 mM.
September 9, 2016

chemistry
Calculate the pH at 25 ° C when 120 mL of a HCl solution having a concentration of 50 mM is added 50.0 mL of a 120 mM ephedrine solution. Assume no change in temperature.   Amitriptyline is a drug used in treating depression. It is typically formulated as the ...
September 9, 2016

chemistry
presentation Tasks:  Ephedrine (structure see below) is a natural product that is used as a medicine in the treatment of asthma. The corresponding acid to ephedrine have pKa = 9.60 at 25 ° C.   Question:  Calculate the pH reaches 991 mg ephedrine ...
September 9, 2016

Maths
Ahmed says that there are 70 sweet in the box to the nearest 10 what is the least number of sweets that could be in the box
September 6, 2016

Maths
A plane setts off from airport A and flies due east for 100 km, then turns to fly due south for 80 km before landing at an airport b show that the approximate bearing of airport b from airport a is 129
September 3, 2016

History
Thanks!!
August 29, 2016

History
Which of these words best describes a merchant? A. Explorer B. Middleman C. Monarch D. Slave I have having trouble between Explorer and middleman... I think it is B.
August 29, 2016

biology
Color blindness is a defect in vision of colors, this defect is due to a localize-homologous segment of chromosome X. In the document I have a pedigree which the parents and their children are normal; but then most of the children got married to a diseased one which 50% ...
August 25, 2016

Math
In the cafetería,100 milk cartons were put out for breakfast at the end of breakfast 27 remained. What Is the ratio of the Number of milk cartons taken to the total Number of milk cartons?
August 23, 2016

Pre Calculus
Two forces with magnitudes of 150 and 75 pounds act on an object at angles of 30° and 150°, respectively. Find the direction and magnitude of the resultant force. Round to two decimal places in all intermediate steps and in your final answer. Having lots of trouble ...
August 18, 2016

Math
What do you do when you have for sale factor 0.5 and 0.25
August 10, 2016

Geometri euclid
The small circle and the large circle have the same center O. Chord AB is tangent to the smaller circle at C. Prove that the area between the large and small circle is the same as the area of the circle that has AB as a diameter
July 30, 2016

chemistry
Assuming all gases are at the same temperature and pressure, how many milliliters of hydrogen gas must react to give 41.0 mL of NH3? 3H2(g)+N2(g)→2NH3(g)
July 20, 2016

Chemistry
A typical antacid contains CaCO3. If such an antacid is added to 25.0 mL of a solution that is 0.250 M in HCl, how many grams of CO2 gas are produced?
July 17, 2016

Chemistry
A patient received 5.0 g of NaCl in 8 hours. How many milliliters of a 0.40 % (m/v) NaCl (saline) solution were delivered?
July 17, 2016

chemistry
Calculate the grams or milliliters of solute needed to prepare the following solutions. 1.)75. g of a 7.0 % (m/m) KCl solution 2.) 1250 mL of a 8.0 % (m/v) NH4Cl solution 3.) 270. mL of a 15.0 % (v/v) acetic acid solution I really just need to know how to work the first ...
July 17, 2016

chemistry
Solubility (g/100gH2O) Substance 20∘C 50∘C KCl 34.0 42.6 NaNO3 88.0 114.0 C12H22O11 (sugar) 203.9 260.4 Using the above table, determine whether each of the following solutions will be saturated or unsaturated at 50 ∘C. 1.) Adding 19.7 g KCl to 35.0 g H2O 2.)...
July 17, 2016

chemistry
What volume of 0.10 M NaOH can be prepared from 250. mL of 0.30 M NaOH? A) 0.075 L B) 0.25 L C) 0.75 L D) 0.083 L E) 750 L
July 15, 2016

chemisrty
Which one of the following compounds will NOT be soluble in water? A) NaOH B) Na2S C) K2SO4 D) LiNO3 E) PbO
July 15, 2016

Probability and statistic
Suppose the counts recorded by a Geiger counter follow a Poisson process with an average of two counts per minute. Round the answers to 3 decimal places. (a) What is the probability that there are no counts in a 30-second interval? (b) What is the probability that the first ...
July 1, 2016

college algebra
in a class of 30 students all of them are either female or smokers. while only 5 are female and smokers. if there are 12 male smokers in the class, then how many female nonsmokers are in the class?
June 15, 2016

Math
Wait, I figured it out, you do 36%.
May 18, 2016

Math
52%, 36%, or 12%??
May 18, 2016

Math
A survey showed that 36% of car owners prefer two door cars, 52% prefer four door cars, and 12% have no preference. You ask 300 people. How many do you think will prefer the two door cars.
May 18, 2016

Math
That would be 5.
May 18, 2016

Math
the probability of winning a game is 25%. how many times should you expect to win if you play 20 times.
May 18, 2016

Math
from a barrel of colored marbles, you randomly select 5 blue, 2 yellow, 3 red, 4 green, and 2 purple marbles. Find the experimental probability of randomly selecting a marble that is not yellow.
May 18, 2016

science
Calculate the kinetic energy in joules of a body of mass 30kg at a velocity of 3ms-1
May 13, 2016

language arts
which sentence best describes the employer in the original story "the ninny" and the employer in the adaptation the governess
May 10, 2016

math
ms.sue is right
May 10, 2016

Science
How test tube babies are born?
May 6, 2016

Math
2.A. 6,501.5 * 1000 = 6,501, 500
May 6, 2016

English
Yes . She got on the bus to school every day. Its correct
May 6, 2016

Geography
I NEED help on the introduction
May 5, 2016

Geography
I need help with my introduction and topics for my five paragraph essay on why the stamp act was not fair.
May 5, 2016

life orientation
I dont have any idea how can i answer this question..can you please help me
May 4, 2016

English
thank you so much here if anything
May 2, 2016

life orientation
Right to have free movement
April 20, 2016

life orientation
3 human rights violation?
April 20, 2016

Calculus 1
Find the formula for a function of the form y=bxe^(-ax) with a local maximum at (4,12)...
April 13, 2016

algebra
a 38 inch piece of steels is cut into three pieces so that the second piece is twice as long as the first piece, and the third piece is three inches more than four times the length of the first piece. find the lengths of pieces.
April 4, 2016

Basic Finance
Suppose we observe the following rates: 1R2= 8%, 1R2= 10%. If the unbiased expectations theory of the term structure of interest rates holds, what is the 1-year interest rate expected one year from now, E(2r1)?
April 1, 2016

Math
A hockey team can win, lose, or tie a match. It gets 2 points for a win, 0 points for a loss, and 1 point for a tie. It has lost 10 out of the 28 matches it has played so far, and it has 30 points. Which two equations can be used to find its number of wins, w, and its number ...
March 31, 2016

chemistry
For the following reaction at equilibrium, which change would shift the position of equilibrium toward forming more products? (Circle your answer(s) as there may be more than one.) 2NOBr(g) 2NO(g) + Br2(g), ∆Hºrxn = +30 kJ/mol A) Decrease the total pressure by ...
March 30, 2016

algebra
A large swimming pool has a perimeter of 1,028 meters, this rectangular-shaped pool is 40 meters longer than 5 times its width. Find its dimensions. width m length m
March 25, 2016

Art
WriteTeacher
March 24, 2016

Art
What did the Vogel's artworks communicate about their historical interests? They collected works that were culturally popular. They collected works that depicted revolutions. They collected works that depicted the history of cities. ( my choice ) They collected works that ...
March 24, 2016

physics
Which is the vector quantity that describes the shortest path between two points?
March 22, 2016

Math
Beta has a rope 23m long. She cutis off 1/5 of it.How long are the two pieces
March 21, 2016

Business
4. Which one of the following philosophies makes every employee a quality inspector for his or her own work? A. Six sigma C. Kaizen B. Quality at the source D. TQM 5. According to Maslow’s theory, what happens when a need is satisfied? A. The need disappears and won’...
March 19, 2016

Business
Answer D. The theory refers to control being achieved by manipulating the behaviour good or bad
March 19, 2016

Business
Help?
March 19, 2016

Business
10. Which statement is most accurate regarding reinforcement theory? A. Attainable goals lead to high levels of motivation under certain conditions. B. Perceptions of unfairness are viewed as punishments and reduce productivity. C. Management style is based on the extent to ...
March 19, 2016

Bus.
D?
March 19, 2016

4th grade math
I have 5 more red pins than yellow pins and 8 more yellow pins than green pins. The green pins are 3 centimeters shorter than the red and yellow pins. I have 18 green pins. How many red, yellow and green pins do I have
March 16, 2016

Analytical Chem
Equilibrium involving SO2(g), O2(g) & SO3(g) is important in sulfuric acid production. When a 0.0200 mol sample of SO3 is introduced into an evacuated 1.52 L vessel at 900 K, 0.0142 mol, SO3 is found to be present at equilibrium. What is the value of Kp for the dissociation of...
March 16, 2016

Language
yes 1 is B
March 14, 2016

life orientation
Identity three courses or study field associated with science and give 2 reasons for each
March 6, 2016

chemistry
3.05 g of hydrated copper sulphate produces 1.94g of anhydrous salt.assuming complete removal of all water of crystallization,determine the formula of hydrated copper sulfate
March 1, 2016

History
Okay thanks
February 28, 2016

History
Which factor contributed to growing conflict over slavery from the 1820s through the 1850s? falling crop prices rapid industrialization rising tariff rates territorial expansion** If someone could please help me out a little. I'm pretty confused and this is my educated ...
February 28, 2016

Maths
Thank you for answering, it really helped :) Just wondering when I am supposed to know to put x ¸ R? Thanks
February 26, 2016

Maths
Sorry, the symbol did not come out properly when I posted the question. The answer to the question is x followed by an equals sign with a line going through it then 1.
February 26, 2016

Maths
I need to solve this inequality: 3(x-1)^2 > 0 The answer is x ‚ 1, but I don't understand why the answer is not allowed to be equal to 1? Thanks :)
February 26, 2016

COLLEGE
-4 TO THE SECOND POWER + 5 =
February 17, 2016

chemistry
Calculate the energy (in kJ) required to heat 25 g of liquid water from 25oC to 100.oC and change it to steam at 100oC. The specific heat capacity of liquid water is 4.18 J/goC, and the molar heat of vaporization of water is 40.6 kJ/mol.
February 17, 2016

Math
An unknown radioactive substance has a half-life of 124 years. How long will it take a 67 grams sample to degrade to 18 grams?
February 17, 2016

College
-42-@ -4second power + 5 =
February 16, 2016

Geography
It is actually the first second, and third not the last, thanks anyway.
February 10, 2016

Geography
It was a typo, sorry.
February 10, 2016

Geography
*East Asia
February 10, 2016

Geography
Could someone please help, please?
February 10, 2016

Geography
which question would best help you analyze the population density of north korea? You have to choose 3 correct answers. How many square miles does East Asia covers? <--- Which region of North Korea has the best geography for farming? What is the population of North Korea&#...
February 10, 2016

Chemistry
Calculate the concentration of H+ ions of an aqueous solution of nitrous acid ( HNO2) to 0.02 mol/L knowing that the degree of ionization of acid is 3%
January 20, 2016

Physics
A 40kg mass hangs from two cables. One cable is at a 25 degree angle. The other cable is horizontally attatched to the mass. Find the tension for each cable
January 14, 2016

Math
George bought some CDs at his local store. He paid $15.95 for each CD. Nora bout the same number of CDs from a store online. She paid $13.95 for each CD, but had to pay $8 for shipping. In the end, both George and Nora spent the exact same amount of money buying their CDs! How...
January 13, 2016

math
9:21 :) Have a good day! Happy New year!
January 12, 2016

English
What literary device is most strongly represented in the following line from “Beowulf?” “Follower and the strongest of the Geats” A. Alliteration B. Hyperbole C. Kenning D. Caesura
January 12, 2016

PHYSICS
No, it cannot.
January 12, 2016

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