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December 20, 2014

Posts by Maria


Total # Posts: 1,557

chemistry
Mercury has a density of 13.6 g/mL. What is the mas of 4.72 L of mercury?
January 17, 2011

chemistry
A sample of crude oil has a density of 0.87g/mL. What volume in liters does a 3.6-kg sample of this oil occupy?
January 17, 2011

chemistry
No! It Al(OH) with the subindex of 2 ==> Al to the power+ plus OH with a negative sign on the top!
January 15, 2011

chemistry
balance the chemical equation: Al(OH)2-- Al^2+ +OH^-
January 15, 2011

chemistry
show that 1mg/L = 1g/m3
January 15, 2011

chemistry
you made up a standard solution of calcium sulfate (CaSO4). the temperature is 25C. you then add 5.00*10^-3 odium sulfate (Na2SO4). Calculate the concentrations of calcium and sulfate after equilibrium is reached? The pKs of CaSO4 is 4.58.
January 15, 2011

chemistry
The concentration of a chemical degrades in water according to order kinetics. the degradation constant is 0.2 day^-1. if the initial concentration is 100.0 mg/L, how many days are required for the concentration to reach 0.14 mg/L?
January 15, 2011

chemistry
the concentration of a chemical degrades in water according to order kinetics. the degradation constant is 0.2 day^-1. if the initial concentration is 100.0 mg/L, how may days are required for the concentration to reach 0.14 mg/L?
January 15, 2011

chemistry
if 200mg of HCl is added to water to achieve a final volume of 1.00 L, what is the final pH?
January 15, 2011

chemistry
a) 45.00g/L(1000mg/g)(1L/1000mL)=45mg/mL b)NaHCO3: 22.99+1+12+3(16)= 83.99g/mol prop. of Na (22.99/83.99)=0.54 c)? d)?
January 15, 2011

chemistry
A solution of sodium bicarbonate is prepared by adding 45.00g of sodium bicarbonate to a 1.00-L volumetric flask and adding distilled water until it reaches the 1.00-L mark. Calculate the concentration of sodium in units of: a) milligrams per liter b) molarity c) normality d) ...
January 15, 2011

Chemistry
A solution is made by dissolving 10.20 grams of glucose (C6H12O6) in 355 grams of water. What is the freezing-point depression of the solvent if the freezing point constant is -1.86 °C/m?
January 14, 2011

engineering
If faucet is dripping at a rate of one drop per second and each drop contains 0.150 milliliters. Calculate how much water will be lost in 1 year.
January 14, 2011

World History
How was the grenade developed to help the war effort?
January 13, 2011

PHI.: 103
what fallacy is this? I don't know what colleges are teaching these days! I have just received a letter of application from a young man who graduated from the state university last June. It was a wretched letter – badly written, with elementary errors in spelling, ...
January 13, 2011

9th grade alegbra
input/output numbers. i need the relation. x-1 2 3 4 5 y-0 5 28 81 176
January 11, 2011

statistics
from a group of six people two individuals are to be selected at random. How many possible selections are there?
January 8, 2011

Statistics
About how many participants are needed for 80% power in each of the following planned studies that will use a t test for dependent means with p < .05? Predicted Effect Size Tails (a) Medium Two (b) Large One (c) Small One
January 8, 2011

Statistics
About how many participants are needed for 80% power in each of the following planned studies that will use a t test for dependent means with p < .05? Predicted Effect Size Tails (a) Medium Two (b) Large One (c) Small One
January 8, 2011

Math
if a triangle has a perimeter of 50cm one side is double the length of the base and the second side is four less than three times the base how long is the base?
January 6, 2011

Algrebra
3u-ux/x=6y/x
January 6, 2011

Math (algebra)
(y-1)/2u+x=m what does "u" equal?
January 6, 2011

Math (algebra)
(x-u)/3=5-y what does "u" equal?
January 6, 2011

math
To multiply 5 by 3, you can find the product of 2 and 5 and the product of 1 and 5 and ________them.
January 6, 2011

math
Write 6+6+6+6=24 as a multiplication sentence.
January 6, 2011

Math
Alright thanks I get it now (: I guess I was just multiplying wrong.
January 2, 2011

Math
I don't get page 50 of algebra with pizzazz! Please help? 7) Kathy is 6 years younger than bill. 12 years ago bill was twice as old as Kathy was then. How old are they now?
January 2, 2011

unscramble spanish words
sandia
January 2, 2011

Garland High school
Suppose you must maintain a balance of least $500 in your checking account in order to have free checking. The current balance in your checking account is $635.27. Which inequality describes how much can write a check for a and still have free checking? A. 635.27>500-x B. ...
December 30, 2010

physics
phuthy sawal nae andy
December 29, 2010

math
(28-2 x9) with the power of 2 + 2x7
December 27, 2010

Algebra
How do I find the value of x such that the data set has the given mean. Example: 11,12,5,3,x; Mean=7.4
December 14, 2010

soc 120
1. The average height of members of the high scho etball team is six feet, three inches. Jerry is on the high school basketball team, so Jerry must be taller than six feet. The argument above is flawed because it confuses (Points : 1) Jerry with other members of the team the ...
December 12, 2010

Comm
Personal finance classes can help you if you have difficulties making budgets. Looking for verb and verb tense
December 11, 2010

physics
How much heat must be added to 0.55 kg of aluminum to change it from a solid at 180°C to a liquid at 660°C (its melting point)? The latent heat of fusion for aluminum is 4.0x10^5 J/kg. I understand the Equation Q=mc times change it T would that be .55 times 4.0 x 10^5 ...
December 10, 2010

physics
im wondering the same thing as leah cause i left mass in kg and it was marked wrong please help
December 10, 2010

physics
How much heat must be added to 0.55 kg of aluminum to change it from a solid at 180°C to a liquid at 660°C (its melting point)? The latent heat of fusion for aluminum is 4.0 105 J/kg.
December 10, 2010

4th grade
Jorge and Hector like to play marbles.Jorge had 7 more than four times the number of marbles that Hector had. Together they had 37 marbles. How many marbles did Jorge have?
December 9, 2010

algebra
(1-2i)(1+2i)
December 7, 2010

Chemistry
why do isomers have different properties? please give examples.
December 7, 2010

physics
Two identical containers are open at the top and are connected at the bottom via a tube of negligible volume and a valve which is closed. Both containers are filled initially to the same height of 1.00 m, one with water, the other with mercury, as the drawing indicates. The ...
December 6, 2010

trigonometry
find all degrees solutions to the following equation: sin (A + 50 degrees)=1/square root 2
December 5, 2010

physics
the negative charge distribution over the surface of two isolated spheres is depicted in the diagram. one of the spheres is made of copper and the other is of rubber. identify the sphere that depicts the charge distribution of copper and that of rubber. support the answer with...
December 1, 2010

physics
a positively charged light metal ball is suspended between two oppositely charged metal plates on an insulating thread. after being charged once. the plates are disconnected from the battery. describe the behavior of the ball. (the plates are not touching nothing and the ball ...
December 1, 2010

physics
what happens when light moves from a material with a lower index of refraction to another material with a higher index of refraction? please sho work and thank u
December 1, 2010

physics help
A 1240 N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A W = 1970 N crate hangs from the far end of the beamThe angle between the beam and the horizontal is 30 degrees upwards and the angle between the horizontal and the ...
November 27, 2010

english
I have to write a paragraph which sustains an ironic tone. I have two thesis that I want to write about. (1)Being organized shows a lack of creativity. (2) Reading is a waste of time. I want to write about the first one. Please tell me a way to write about it using Ironic ...
November 21, 2010

world history
what is the process of ice fishing in the colonial times
November 21, 2010

math
which is greater half pennies or 0.05 how do you know
November 17, 2010

earth
which two rocks are primarily composed of a mineral that bubbles with acid?
November 17, 2010

physics
OMGG I NOEE UGHH
November 17, 2010

English
uggh! sick of just getting sites! i need the real thing here! ... sorry to sound harsh but ive already looked at that site and it just doesnt help me...
November 16, 2010

English
Define Socialism. George Orwell doesnt think Socialism can work. WHY? How does he prove that it doesnt work by the way Animal farm ends?
November 16, 2010

math
8q+6-2p=0 39=p-q what is the solution or ordered pair
November 16, 2010

English
OK thanks that helped a lot!
November 16, 2010

English
We just got done reading Animal Farm, by George Orwell. I cant come up with enough facts for the following questions. How does Napoloen and the other pigs control the animals through fear and intimidation? so far i have by 1)by killing other animals right before their eyes 2)...
November 16, 2010

11th grade
SIMPLE! add 49 to the other side- 9x^2=49 Now take the square root of 49. I'm in 10th grade, isnt this easy? maybe im doing it wrong?
November 16, 2010

HELP! advanced algebra
thanks dude!!!!!!
November 14, 2010

I NEED SERIOUS HELP!
WHY WILL NO ONE HELP ME!!!????!!???
November 14, 2010

HELP! advanced algebra
A bakery is making whole-wheat bread and apple bran muffins. For each batch of bread they make $35 profit. For each batch of muffins they make $10 profit. The bread takes 4 hours to prepare and 1 hour to bake. The muffins take 0.5 hour to prepare and 0.5 hour to bake. The ...
November 14, 2010

math
96/288=x 100-x= pages left
November 14, 2010

Algebra 2
An appliance store manager is ordering chest and upright freezers. One chest freezer costs $250 and delivers a $40 profit. One upright freezer costs $400 and delivers a $60 profit. Based on previous sales, the manager expects to sell at least 100 freezers. Total prfit must be ...
November 14, 2010

Algebra
im guessing you gave up on me bob? :(
November 14, 2010

Math
James has an assigned seat for his flight to Denver.The seats on the plane are numbered 1-49.James's seat number is an odd number greater than 10 that is a factor of 100.What is his seat number for the flight?
November 8, 2010

physics
can you help me through this? A boat moves through a river at 7.0 m/s relative to the water, regardless of the boat's direction. If the water in the river is flowing at 3.5 m/s, how long does it take the boat to make a round trip consisting of a 250 m displacement ...
November 7, 2010

american History
I only had to answer that question if I didn't agree with imposing taxes. I am looking into the other questions now
November 4, 2010

american History
I need help answering the rest of the question. Is this someething you can further assist me with?
November 4, 2010

american History
Can someone help me please. I am having a hard time answering this question. Do you think Great Britain was justified in imposing taxes on the colonies following the French and Indian War? Or do you believe the colonists had legitimate grievances regarding the British policy ...
November 4, 2010

comparing fractions
In the fourth-grade class at Baker Elementary, 9 students are left-handed. The fifth grade has 7 left-handed students and the sixth grade has 6. The number of students in the fourth grade is 3 times the number of left-handed students in the class. The sixth grade has 3 more ...
November 3, 2010

comparing fractions
at Morris Elementarhy there are 45 students in each grade, four though six. In the fourth grade, 19 participate in sports after school. Two out of every six fifth grade play sports after schoo;. In the sixth-grade class, seven of every ten students are not playing sports. ...
November 3, 2010

algebra
h=23
November 2, 2010

Physics
A 23.0 kg block is initially at rest on a horizontal surface. A horizontal force of 80.0 N is required to set the block in motion. After it is in motion, a horizontal force of 57.0 N is required to keep the block moving with constant speed. Find the coefficients of static and ...
November 2, 2010

geometry
in triangle GHJ, k(2,3) is the midpoint of GH, l(4,1) is the midpoint of HJ and m(6,2) is the midpoint of GJ. Find the coordinates of G,H and J. can you please show me how to find this? i don't really understand how it would be done. thank you.
November 2, 2010

math 5TH GRADE
fifth gades have the most students playing sports after school.
November 2, 2010

math 5TH GRADE
at morris elementary there are 45 students in each grade, four though six. In the fourth grade, 19 participate in sports after school. Two out of every six fifth graders play sports after school. In the sixth-grade class, seven of every ten students are noot playing sports. ...
November 2, 2010

business
2. You are in the process of a major Spring Clean in your home/bedroom/office/garage. You have identified a variety of new and used items that you are no longer using. With summer around the corner you could use a bit more cash for a little vacation. Utilizing what you have ...
November 1, 2010

5th grade math
i have to write an algebraic expression for the following: jasmine has three times as many chores as her younger brother does.
November 1, 2010

3rd grade
mr.mcwilliams drove 76 miles on sunday and 43 miles Tuesday
October 31, 2010

physics
Which object would have a higher inertia a rock that has a mass of 20 kg or a hollow ball that has a mass of 22 kg?
October 31, 2010

physics
you wont need m, the m, in both sides of the equation cancel each other
October 29, 2010

accounting
i want to know if the transactions are bought machinery for rs50,000, payment made to xyz store by rs10,000 by cheque, purchased office furniture on credit for rs15,000, rs1,000 receieved as a rent for the portion of office building rented out and paid salaries of rs40,000 by ...
October 28, 2010

Algebra
One can think of "a out of b" without actually removing the pieces. For example, one might think of the fraction of Xs in the diagram X X O O O as "two Xs out of five objects," in which case 2/5 of the objects are Xs. Can you apply this way of thinking to ...
October 26, 2010

$th Grade Math input output tables
13 , 19, 27
October 25, 2010

Physics
A runner’s velocity along a straight track is 3.2 m/s at time 5.0 s and 2.2 m/s at time 13 s. Find the runner’s average acceleration during this time interval.
October 20, 2010

Physics
A car accelerates from rest at 1.70 m/s2 along a 220-m stretch of road. Find the car’s velocity at the end of the stretch.
October 20, 2010

Physics
On a planet that has no atmosphere, a rocket 14.2 m tall is resting on its launch pad. Freefall acceleration on the planet is 4.45 m/s2. A ball is dropped from the top of the rocket with zero initial velocity. (a) How long does it take to reach the launch pad? (b) What is the ...
October 20, 2010

Physics
The United States and South Korean soccer teams are playing in the first round of the World Cup. An American kicks the ball, giving it an initial velocity of 4.3 m/s. The ball rolls a distance of 5.0 m and is then intercepted by a South Korean player. If the ball accelerates ...
October 20, 2010

Physics
A particle's initial velocity is −24.0 m/s. Its final velocity, 3.00 seconds later, is −14.0 m/s. What was its average acceleration?
October 20, 2010

CHEMISTRY
A student needed to standardize a solution of NaOH which was approximately 0.125 M. The student carefully prepared the titration setup, but after 25 mL of NaOH was added, what was the pH of solution if initially flask contains 25 mL of 0.250 M HCl solution?
October 17, 2010

philo
<22{5[2(02)]}> Lawyer: My client, television commentator Jonas Cassell, was fired by the network that employed him for criticizing one of the network’s major sponsors. However, Cassell’s comments were said off the record at a private party, and only became ...
October 16, 2010

geometry
In the triangle ABC, angle a=46 degrees and angle B=83 degrees. How large is the exterior angle at C?
October 16, 2010

high school
How many revolutions are made by a 28inch bicycle wheel min over one mile
October 14, 2010

physics
A water balloon is dropped from the top of a building. Assume the balloon does not break when it strikes the ground. If the water balloon falls a distance of 21m, what is the maximum temperature rise of the water balloon due to it being dropped?
October 12, 2010

Calculus Ab
A 26 foot step ladder is leaned up against a 30 foot building to reach a window near the top. The ladder is being pushed toward the building in a horizontal direction of 2 feet per second. 1. Find each related rate when the ladder is 10 feet away from the building. a. How fast...
October 10, 2010

college
I am stuck on Appendix B in psy/230 I am to find the five major concepts or events in three history periods 1930- 1950 I chose tit theory humanistic thoery cognitive theories learning theories and cognitiv/cosil leraning then 1950-1970 ther three factor model extraversion, ...
October 7, 2010

physics
shouldn't acceleration be -9.8 and not +9.8 since it freefalling in the negative direction?
October 6, 2010

algebra)
User: Identify the property shown by each number sentence 5x(2x4)=(5x2)x4
October 5, 2010

math
Diana takes 6 steps forward, then 2 steps back. If she repeats this pattern, how many steps will she be from where she started after 4 moves? After 5 moves?
October 5, 2010

8th grade
Math I am a fraction in simplest form. I am greater than1/3 and less than 1/2. The sum of all my digitsb is 8. the difference between my numerator and denominator is 7. What fraction am I?
September 30, 2010

religion
1)germany 2)catholic 3)pope
September 29, 2010

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