Sunday
February 7, 2016

Posts by Katherine

Total # Posts: 545

math
The classroom has 4 desk each row. there are 5 rows. how many desk are there in the classroom.
January 7, 2016

Math
Which statement is true? A. Every rational number is a square root. B. Every irrational number is a fraction. C. Every rational number can be written as a fraction. D. Every square root can be written as a whole number I go with C
November 12, 2015

Spanish
Wow that was no help Ms.Sue
November 6, 2015

Spanish
She is pretty confusing and is not helpful
November 4, 2015

chemistry
How many grams of lithium hydroxide are needed to remove 920 g of carbon dioxide in the air
August 27, 2015

math
At a popcorn factory, for every kilogram of popcorn that is popped, 100 grams are not popped. The factory pops 5 kilograms every day. What is the total weight in kilograms, of the unpopped corn in the month of april?
August 20, 2015

chemistry
Thank you for your answer. Why we do not use mull or thin-solid film method for this one?
April 26, 2015

chemistry
please help !!! You are given an organic solid which reacts with most organic solvents. How would you obtain the IR spectrum of it?
April 26, 2015

AP Chemestry
Ah! That would explain it. Silly oversight on my part, sorry about that. K is defiantly in units of hours^-1, so that must be the correct choice. I'll check in with my teacher specifically tomorrow to see why the question ended up that way. Thanks a ton for the help, I'...
April 21, 2015

AP Chemestry
Sorry for the late reply! Units for the constant are grams per liter (molar). Both answers A and B were exactly the same, so I assume there must have been a printing error, or something or the sort. As for my work, I inserted the info given into the equation and solved from ...
April 21, 2015

AP Chemestry
(Alright, third attempt here. My replies keep being eaten) I inserted my givens into the equation, ' Natural-log At/Ao = negative constant multiplied by the time passed '. However, my answer isn't close to the choices. Any help would be appreciated!
April 21, 2015

AP Chemestry
Whoops, somehow I managed to mess that up. Here's the rest of my question The question is as follows: Find the initial concentration of a sucrose solution that has a current concentration of 3.45 molar after 2 hours and 30 minutes at 25°C. For this reaction at 25°C...
April 21, 2015

AP Chemestry
The question is as follows: went wrong, I'd really appreciate it!
April 21, 2015

physics 1
444g mass vibrates according to the equation x = 0.348 sin (5.82 t) where x is in meters and t is in seconds. Determine the total energy. Determine the kinetic energy when x is 14.0cm. Determine the potential energy when x is 14.0cm.
December 13, 2014

physics 1
will G be 6.67*10^(-11)
December 12, 2014

physics 1
what would I use for r and M?
December 12, 2014

physics 1
Two isolated masses, M1 = 2.20 kg and M2 = 589 kg are initially rest, a distance d= 161 cm apart. Their gravitational attraction is the only force acting. Calculate the time it takes for M1 to move from that distance to 159 cm from M2. Assume that M2 does not move and that the...
December 12, 2014

Physics
A bullet of mass m= 2.50×10-2kg is fired along an incline and imbeds itself quickly into a block of wood of mass M= 1.60kg. The block and bullet then slide up the incline, assumed frictionless, and rise a height H= 1.45m before stopping. Calculate the speed of the bullet...
December 12, 2014

Chemsitry
December 11, 2014

Biology
what is the vascular system of the lilac flower. i tried finding some sites. some sites would help me. PLease!
December 5, 2014

biology
Describe the vascular system and functions of each component of the Lilac flower i tried to find some sites, but i cant find in any. So any sites would help as well
December 3, 2014

thank you!
December 1, 2014

need help on a lab here are the results Mass of empty beaker and glass rod(62.62) Mass of beaker, glass rod, hydrated copper sulfate(66.02) Mass of beaker, glass rod and anhydrous copper sulfate(65.04) Mass of hydrated copper sulfate(3.4) Mass of anhydrous copper sulfate(2.42...
December 1, 2014

SpanishiA
Hola! For 4 ma man it would probably be C (Estan) because when you did the lesson in the English to Spanish words it described the word Estan as and I quote, "they/you (plural) are." This is because the sentence subject is talking about the people in the car. And in ...
November 19, 2014

Chemistry 11
Actually, I made a mistake in my previous question & fixed it, additionally I looked at the link he gave me and didn't find it useful. I appreciate Bob Pursley taking the time out of his day to help me with this problem but I didn't quite grasp what he was getting at. ...
November 18, 2014

Chemistry 11
So I did a lab determining the chemical formula of a hydrate. We had to find the molecular formula of a hydrate of copper (2) sulphate, CuSO4 .xH2O. My observation table looks like this: Mass of clean, dry test tube: 21.6g Mass of test tube + hydrated copper (2) sulphate: 24.1...
November 18, 2014

Chem 11
Would the answer somehow differ if I had different amounts than the person on the link you posted?
November 18, 2014

Chem 11
So I did a lab determining the chemical formula of a hydrate. I really just need somebody to check this over for me. We had to find the molecular formula of a hydrate of copper (2) sulphate, CuSO4 .xH2O. My observation table looks like this: Mass of clean, dry test tube: 21.6g...
November 18, 2014

physics
If each of the three rotor helicopter blades is L = 3.69m long and has a mass of m = 159kg, calculate the moment of inertia of the three rotor blades about the axis of rotation.
November 11, 2014

physics
what would the units be?
November 11, 2014

physics
The distance between a hydrogen atom (m = 1.0u) and a chloride atom (m = 35.5u) in the HCl molecule is 1.27×10-10m. How far from the hydrogen atom is the center of mass of the molecule?
November 11, 2014

Chemistry
A generic solid, X, has a molar mass of 77.7 g/mol. In a constant-pressure calorimeter, 31.2 g of X is dissolved in 289 g of water at 23.00 °C. The temperature of the resulting solution rises to 24.40 °C. Assume the solution has the same specific heat as water, 4.184 J...
November 2, 2014

physics
Displacement vectors A,B,and C add up to a total of zero. Vector A has a magnitude of 1550 m and a direction of 24.1° north of east. Vector B has a direction of 41.0° east of south, and vector C has a direction of 33.4° north of west. Find the magnitudes of vector ...
October 30, 2014

HEALTH
The heart is a _____ that provides the force necessary to circulate the blood to all the tissues in the body. A. Skeletal pump B. Autonomous pump C. Muscular pump D. Systemic pump My answer would be C. i think thats right...
October 8, 2014

physics
What is the acceleration of a car going from 3.0 x 101 km/hr to 1.20 x 102 km/hr in 3.0 x 101 sec?
October 3, 2014

health
Its D. i believe
September 23, 2014

Aviation #2
what accident investigation / forensic methods are used in aviation?
August 25, 2014

Aviation
What procedures and / or methods are recognized within the Aviation industry?
August 25, 2014

Investigation Domain Contexts
What procedures and methods are prescribed/recommended in the Aviation domain?
August 25, 2014

science
Air pressure at the surface of a fresh water lake near sea level is about 10^5 N/m2. At approximately what depth below the surface does a diver experience a pressure of 3.0 e5 N/m2?
July 1, 2014

science
A 444g mass vibrates according to the equation x = 0.348 sin (5.82 t) where x is in meters and t is in seconds. Determine the total energy. Determine the kinetic energy when x is 14.0cm. Determine the potential energy when x is 14.0cm.
May 1, 2014

Math
Kaylee got a 15% raise. She now earns \$23 an hour. How much did she earn before the raise?
April 12, 2014

Math
What is the maximum value of the function y= 18/x^2-9 over the interval -3<x<3? A. 0 B. 2 C. -2 D. Infinity
March 30, 2014

Science
Which statement summarizes water quality issues in China
March 24, 2014

Chemisty
a)What is the [Ca2+] when 100mL of .05M CaCl2 is added to 100mL of .10M K2SO4? b) What is the [SO42-] for part a? c) write the Ksp expression for CaSO4 d)Will a precipitate form in the solution from part a)?
March 20, 2014

Math
What is 3/8=4m-2 over _____ 12
March 20, 2014

history
Thanks for the help :)
March 6, 2014

history
So, it will be A then.
March 6, 2014

history
During the 1950s, the advent of _______ created the largest and fastest-growing impact on American society. A. television. B. suburban communities C. educational reform D. fundamentalist religion. I think it's D. Am I correct?
March 6, 2014

science
Wrong... MA of inclined plane = 20m/1.2m = 16.67 &the rest idk.
February 16, 2014

Math
Tiffany bought 2/5 kg of cherries. Linda bought 1/10 kg of cherries less than Tiffany. How many kg of cherries did they buy altogether?
January 22, 2014

Math
Express fraction 9/4 as the sum of two or three equal parts. Rewrite the problem as a multiplication equation.
January 9, 2014

algebra 1
parallel and perpendicular lines write the slope-intercept for an equation of the line that passes through the given point and is perpendicular to the graph of each equation (4-2) y=1/2 +1, ( 2,-3) y= -2/3+4 (-8,-7) y=-x-8 (6,-2) y=-3x-6
January 9, 2014

Chemistry
A reaction: A(aq) + B(aq) <-> C(aq) has a standard free-energy change of –4.65 kJ/mol at 25 °C. What are the concentrations of A, B, and C at equilibrium if, at the beginning of the reaction, their concentrations are 0.30 M, 0.40 M, and 0 M, respectively? Im not...
November 24, 2013

Chemistry
Silver chromate is sparingly soluble in aqueous solutions. The Ksp of Ag2CrO4 is 1.12× 10–12. What is the solubility (in mol/L) of silver chromate in 1.4 M potassium chromate aqueous solution? In 1.4 M silver nitrate aqueous solution? In pure water?
November 12, 2013

Chemistry
The Ksp of CaSO4 is 4.93× 10–5. Calculate the solubility (in g/L) of CaSO4(s) in 0.300 M Na2SO4(aq) at 25 °C
November 12, 2013

human resource
please help me with my assignment? The company has seven department stores in your city. One of your biggest problems is adequately training new salesclerks. 1. Design a three-day orientation/training program for new salesclerks. to be used. 2. Specify what methods could be ...
October 15, 2013

human resource
The company has seven department stores in your city. One of your biggest problems is adequately training new salesclerks. 1. Design a three-day orientation/training program for new salesclerks. to be used. 2. Specify what methods could be used to evaluate the success of the ...
October 15, 2013

Need Help with Math?
1. Translate P(4,0) right 3 units and up 5 units. Give the coordinates of the image point. (-5,1) (1,-5) (5,7) (7,5) 2. Point A(6, -2) is reflected over the x-axis. Write the coordinates of A'. 6,2 6,-2 -6,2 -6,-2
October 11, 2013

Chemistry
I was able to figure it out! Thank you very much for your help(:
September 30, 2013

Chemistry
I don't know what to do after I set up the Kc equation. How do you isolate x from 1.80=(x^2)/(.062-x)
September 30, 2013

Chemistry
Phosphorus pentachloride decomposes according to the chemical equation PCl5(g) -----> PCl3 (g)+ Cl2(g) Kc= 1.80 at 250 degrees C A 0.206 mol sample of PCl5(g) is injected into an empty 3.30 L reaction vessel held at 250 °C. Calculate the concentrations of PCl5(g) and ...
September 30, 2013

Math
Shelly compared the number of oak trees to the number of maple trees as part of a study about hardwood trees in a woodlot. She counted 9 maple trees to every 5 oak trees. Later in the year there was a bug problem and many trees died. New trees were planted to make sure there ...
September 19, 2013

health
D. and a normal schedule for food is three meals a day and trying to eat them at the same time every day ;)
September 18, 2013

So it would be 3 and not 5?
August 20, 2013

Simplify 6 x 3 divide 3 - 1. Pre-Algebra? Answers: 2 3 5 6 My answer: 5
August 20, 2013

Math
I'm currently taking IBMS and it has elements of several types of math classes (calculus, statistics, algebra, etc.). It is the "lowest" level IB Math class one can take, but not necessarily for students who have a low background in math. I know one student who ...
August 20, 2013

psychology
Nelda is fearful of public places and has managed to stay "at home" for the last three years. She and her therapist have developed a strategy. During the first week, she will go to the front door and open it and look outside. If she can remain calm, the goal for the ...
July 25, 2013

psychology
Its between B and D ... so im going with D
July 25, 2013

psychology
26. Emily and her mother have entered a new place. There are toys on the floor to play with, but no one else is in the room. After a few months on her mothers lap, Emily begins to move toward the toys and is soon playing happily while her mother reads a magazine. When a ...
July 25, 2013

psychology
25. Teenage mothers who are accustomed to existing on hamburgers, French fries, and Cokes need to consider the nutritional needs of the child. Research has shown that a poor diet can _______________.  A. restrict the development of eye and hair color ...
July 25, 2013

Psychology
19. If Paul and Rita are exposed to erotic photographs of the opposite sex, it can be expected that _______________.   A. Rita will report significantly less arousal than Paul B. Paul will report significantly less arousal than Rita C.&...
July 25, 2013

psychology
15. Maria is a Hispanic female, Natasha is a Black female, and Joan is a White female. Each has a high school level education but no work . Statistics show that ..   A. Natasha will earn less than Maria  B. Joan will earn less than Natasha ...
July 25, 2013

Psychology
Well i think this question eliminates B and D... so it could be A then.
July 25, 2013

Psychology
16. Greg and Lydia have been married three years. Both hold executive positions in large corporations and are well respected in their fields. Last January, they were thrilled with the arrival of their first child. Lydia returned to her same position after the birth of ...
July 25, 2013

Psychology
i believe its primary drives..
July 25, 2013

Psychology
Families traveling with young children often make many stops as a result of   A. Primary drives  B. Secondary drives  C. Incentives  D. Cognitive needs
July 25, 2013

psychology
The entire class was in an uproar. The teaching assistant had proctored the exam while the professor was attending a conference and the test seemed unrelated to the chapters which they had studied. The students complaints are based on the test's lack of ______________.&...
July 25, 2013

Physics
A man driving a car toward a large vertical wal sounds his horn. The car is traveling at 81 km/h. The echo off the wall is heard by the man at a frequency of 958 Hz. What is the frequency of the car's horn?
July 22, 2013

arithmetic
james used the rule add 2 to create a sequence.the he used the rule add 12 to create a second sequence.what are the first five terms in each sequence james created?<3
May 7, 2013

chemistry (need by 5!!)
use the van der waals equation to calculate the pressure of 4.00 mol of H20 at 471K in a 4.60-L vessel. how do you solve?
April 26, 2013

Chemistry
By titration it is found that 76.3Ml of 0.178M of NaOH(aq) is needed to neutralize 25.00mL of HCL(aq). Calculate the concentration of the HCl solution.
April 17, 2013

Chemistry
Suppose we have a solution of lead nitrate, Pb(NO3). A solution of NaCl(aq) is added slowly until no further precipitation occurs. The precipitate is collected by filtration, dried and weighed. A total of 10.27g of PbCl2(s) is obtained from 200.0mL of the original solution. ...
April 17, 2013

Chemistry
What mass of precipitate will form if 1.50L of concentrated Pb(ClO3)2 is mixed with 0.200L of 0.280M of NaI? Assume the reaction is complete
April 17, 2013

math
How many?
March 4, 2013

Chemistry
What is the significance of the distance between two metals in the activity series?
March 4, 2013

World History
He was the Chief Justice of the United States Supreme Court from 1836 to 1864. He's remembered as the author of the majority opinion in Dred Scott vs. Sandford in 1857, sometimes known as the Dred Scott Decision
March 4, 2013

math
8 cups
March 1, 2013

social studies
How are petitions and Demonstrations similar?
February 18, 2013

social studies
African amirican used both petitions and demonstrations to fight for cilvil rights?
February 18, 2013

social studies
how are they different?
February 18, 2013

social studies
African Amrican used both petitions and demonstrations to fight for the cilvl rights?
February 18, 2013

us history
the American contitution is base on which belief?
February 5, 2013

science
How many seconds does it take for mercury to go from 0 degrees celsius to 300 degrees celsius?
January 29, 2013

Algebra
How do I work this problem? "Susan is 9 years older than Karen. In 10 years Karen will be 2/3 Susan's age. How old will the two girls be in 10 years?"
January 28, 2013

Math
11/12-1/9=
December 12, 2012

physics
Water (η = 1.00E-3 Pa·s) is flowing through a horizontal pipe with a volume flow rate of 0.0153 m3/s. As the drawing below shows, there are two vertical tubes that project from the pipe. Assume that H = 0.0477 m and L = 0.670 m I know how to plug in everything but...
November 16, 2012

These are “plug-in-the-number” tasks to familiarize you with the main formulas that link the physics concepts of this chapter. They are one-step substitutions, much less challenging than the Think and Solve problems that follow. Average speed ! total distance covered...
October 10, 2012

Physics
These are “plug-in-the-number” tasks to familiarize you with the main formulas that link the physics concepts of this chapter. They are one-step substitutions, much less challenging than the Think and Solve problems that follow. Average speed ! total distance covered...
October 10, 2012

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