Raul
Popular questions and responses by Raul
Chemistry
One reaction of iron with hydrochloric acid is represented by the following thermochemical equation. Fe(s) + 2HCl(aq) ? FeCl2(aq) + H2(g); (Delta)H°= –87.9 kJ How much heat is liberated at constant pressure if 0.215 g of iron reacts with 40.4 mL of
asked on March 24, 2013 
Chemistry
A 0.464 gram sample of a metal, M, reacts completely with sulfuric acid according to: M(s) +H2SO4(aq)=MSO4(aq)+H2(g) A volume of 211 mL of hydrogen is collected over water; the water level in the collecting vessel is the same as the outside level.
asked on March 9, 2013 
science
4.4 g of CO2 contains how many liters of CO2 at STP ? a) 2.4 litre b) 2.24 litre c) 44 Litre d) 22.4 litre
asked on June 19, 2013 
Calculus
The position of a particle moving on a horizontal line is given by s(t)=2t^315t^2+24t5, where s is measured in feet and t in seconds. a: What is the initial position of the particle? b: What is the average velocity of the particle on the interval
asked on March 4, 2013 
Math
Surface area of each solid .round to THE nearest tenth if necesaria. 6cm 5.2cm 7cm 6c
asked on April 26, 2015 
history
what do you think contributed to the jump in productivity among american workers during world war 2?
asked on February 2, 2013 
history
why did the national debt rise so quickly during world war 2?
asked on February 2, 2013 
math
use mental math to find each value cost of 8 items at $12.98 each
asked on August 17, 2011 
Thermodynamics and Heat Transfer
A steam pipe is 75 mm external diameter and is 80 m long. It conveys steam at a rate of 1000 kg/h at a pressure of 2 Mpa. The steam enters the pipe with a dryness fraction of 0.98 and is to leave the pipe with a dryness of not less than 0.96. The pipe must
asked on April 21, 2010 
Statistics
A) Starting at time 0, a red bulb flashes according to a Poisson process with rate λ=1 . Similarly, starting at time 0, a blue bulb flashes according to a Poisson process with rate λ=2 , but only until a nonnegative random time X , at which point the
asked on May 18, 2020 
Statistics
Let X and Y be independently random variables, with X uniformly distributed on [0,1] and Y uniformly distributed on [0,2] . Find the PDF fZ(z) of Z=max{X,Y} . For z2 : fZ(z)= For 0≤z≤1 : fZ(z)= For 1≤z≤2 : fZ(z)=
asked on May 18, 2020 
Statistics
Let X and Y be jointly continuous nonnegative random variables. A particular value y of Y is observed and it turns out that fXY(x∣y)=2e−2x , for x≥0 . 1. Find the LMS estimate (conditional expectation) of X . 2. Find the conditional mean squared
asked on May 18, 2020 
Physics
When you are traveling in your car at highway speed, a bug is suddenly splatters into your windshield. A) Who experiences the larger force? B) Who experiences the larger acceleration?
asked on March 12, 2020 
Computers
What are the particular hardware elements that have a direct memory access device?
asked on May 27, 2017 
Math
Write two different numbers that when rounded to the nearest tenth will give you 18.3
asked on March 9, 2017 
Chemistry
A 250 g sample of water with an initial temperature of 98.8 c loses 7,500 joules of heat. What is the final temperature of the water ?
asked on October 3, 2015 
math fractions
Rogelio has 3 onedollar bills, 5 quarters, 4 dimes, 2 nickels, and 9 pennies. What fraction of the coins are quarters?
asked on February 27, 2015 
3rd grade math
Justin took photographs during a trip to the mountains. He used one roll of color film and one roll of blackandwhite film. He took 1/3 of the pictures in color during a picnic with his family. If he took 36 pictures in all, how many color pictures did he
asked on February 27, 2015 
3rd grade math
A parking lot near the sports field holds a total of 52 vehicles. There are 42 cars parked there now. Half of these cars are red, 10 are blue, and the rest are silver. What fraction of the cars are silver?
asked on February 27, 2015 
3rd grade math
A pile of index cards has a mixture of white, pink, yellow, red, and blue cards. Some cards are lined, and some are unlined. The total number of cards is 150. 2/5 of the cards are blue, 10 cards are white, and 10 cards are red. Half of the remaining cards
asked on February 26, 2015 
MAth
Two thirds of the musicians in a 16piece band are girls. the 16 musicians include 12 brass players. what fraction of the band plays brass instrument?
asked on February 26, 2015 
3rd grade math
Two thirds of the musicians in a 16piece band are girls. the 16 musicians include 12 brass players. what fraction of the band plays brass instrument?
asked on February 26, 2015 
Math
Familling new carpet and wants to know how much carpert they need , but they olso know that carpet is sold by the square yard. 23feetx9feetx6feet x 3feetx10 feetx19feet
asked on February 9, 2015 
science
Solar energy is mainly caused due to a) Burning of hydrogen in the oxygen b) Fission of uranium present in the sun c) Fusion of protons during synthesis of heavier elements d) Gravitational contraction
asked on June 19, 2013 
science
Hydraulic press is based on a) Archimedes principled b) Bernoulli’s solution c) Pascal/s law d) Reynold’s law
asked on June 19, 2013 
science
The heaviest naturally occurring element is a) Uranium b) Iron c) Silica d) Aluminum
asked on June 19, 2013 
science
The most malleable metal is a) Sodium b) Lead c) Steel d) Gold
asked on June 19, 2013 
science
A boat of mass 40 kg is at rest; A dog of mass 4 kg moves in the boat with a velocity of 10 m/s. what is the velocity of boat? a) 4 m/s b) 2 m/s c) 8 m/s d) 1 m/s
asked on June 19, 2013 
science
Silvering of mirror is done by a) AgNO3 b) Ag2O3 c) Fe2O3 d) Al2O3
asked on June 19, 2013 
geometry
Shalonda notices that when she stands next to the flagpole, she casts a shadow that is 8 feet long and that the flagpole casts a shadow that is 28 feet long. Little Shalonda is 4 feet tall. How tall, to the nearest foot, is the flagpole?
asked on May 8, 2013 
reading
Renee has a research paper due in three days. She has set aside two hours to complete this task. What is wrong with this study goal? A. It is not significant and can’t be rewarded. B. The goal is not concrete and specific. C. The time she has allotted is
asked on April 26, 2013 
Chemistry
2M +6HCl–>2MCl+3H2 Delta H= 638.0 Kj HClg—>HCl aq= Delta H 74.8 Kj H2+Cl2–>2HCl Delta H 1845.0 Kj MCl3s–> MCl3 aq Delta H 249.0 Kj Use the information above to determine the enthalpy of the following reaction. 2M +3Cl2–>2MCl3 Delta H =???
asked on March 22, 2013 
Chemistry
At constant volume the heat of combustion of a particular compound is 3378.0 kj/mol.When 1.563 g of this compound ( molar mass of 126.88 g/mol )was burned temp rose 6.991 C. What's the heat capacity of the calorimeter(calorimeter is constant)?
asked on March 22, 2013 
Calculus
At what value of x does the graph of y=9x^(1/3)+x^2 have a point of inflection?
asked on March 4, 2013 
chemistry
what minimum mass of copper ii nitrate must be added to 70 ml of a .0594 M phosphate solution in order to completely precipitate all the phosphate as solid copper ii phosphate. 2PO4^3+3Cu(NO3)2>Cu3(PO4)2+6NO3^1 I can not come up with the correct answer
asked on March 1, 2013 
history
how did the navajo codetalkers aid marines in battle?
asked on February 5, 2013 
history
1.who was the commander of the u.s. navy in the pacific? 2.where did the japanese strike after pearl harbor?
asked on February 5, 2013 
science
1. Identify the phase or phases of matter (solids, liquids, and gases) that apply to each statement. More than one phase of matter may apply to each statement. a. Molecules do not move around, but vibrate in place b. Has volume but no particular shape c.
asked on January 29, 2013 
science
how much work was accomplished by the fall?
asked on January 9, 2013 
algebra 2
solve each system by substitution 1. 6x3y=33 2xty=1 2. 2xy=7 3x2y=10 3. 4x=8y 2x+5y=27
asked on January 8, 2013 
algebra 2
solve each system by substitution 1. y=xt1 2x+y=7 2. x=y2 3xy=6 3. y=2xt3 5xy=3
asked on January 8, 2013 
history
what conditions were present in the united states after world war 1?
asked on December 18, 2012 
history
who was the republican candidate who won the election of 1920?
asked on December 18, 2012 
us government
how is compromise and majority rule a part of congressional politics?
asked on November 5, 2012 
complete subject and complete predicate
this gold ring once belonged to my grandmother
asked on September 23, 2012 
chemistry
How many grams of oxygen are collected in a reaction where 245 mL of oxygen gas is collected over water at a temperature of 25 ^\circ {\rm C} and a total pressure of 688 torr
asked on April 29, 2012 
Intermediate Algebra
Hi another question I have please. Find the midpoint of F A B? A(6,10) B(20,14)
asked on April 1, 2012 
Intermediate Algebra
The average cab ride cost per mile(x) is given by f(x)=2x+3.50, where x is miles and f(x) is money. A. Find the cost of a 5 mile ride. B. Find the cost of a 3/4 mile ride. C. How many miles can you go in $50?
asked on April 1, 2012 
Geometry
wats the areas of a rectangle... base of : 5m high of: (4a+b)m
asked on October 3, 2011 
Math
Describe in your own words how to solve a linear equation or inequality
asked on July 27, 2011 
Chemistry
which is more concentrated a 1 liter solution containing 30 g of NaCl or a 1 liter solution containing 30g of KCl
asked on April 4, 2011 
science
the length of the string is 9.984cm.What is the length of the string to the nearest tenth of a centimeter
asked on September 22, 2010 
algebra
what does x equal in the equation 3x35=9x59
asked on August 24, 2010 
physics
A current I = 16 A is directed along the positive xaxis and perpendicular to a magnetic field. A magnetic force per unit length of 0.15 N/m acts on the conductor in the negative ydirection. Calculate the magnitude and direction of the magnetic field in
asked on March 8, 2010 
philosophy
write a 350700 word response describing how Socrates’, Plato’s, and Aristotle’s philosophies relate to each other
asked on November 9, 2008 
Us History
The Lousiana Purchase removed a major point of contention between the United States and a European power but left many others. Which areas of possible conflict remained, and what were the sources of these potential conflicts?
asked on October 16, 2008 
I donth Get it !...US History
Did the differing circumstances of Maryland and Virginia's founding affect the course of their respective development? If so, how?
asked on September 7, 2008 
Us History
What problems dogged the early settlements of the Chesapeake region?
asked on September 7, 2008 
hystory
Why did Europeans press westward during this period, instead of concentrating in the more easily defended coastal towns?
asked on September 6, 2008 
algebra
how do i graph this quadratic funtion y=x(squared) + 4x  4
asked on March 11, 2008 
Maths
solve the equation: 4cos2*theta + 3cos*theta + 3 = 0 for values between 0 and 180 degrees If that is cosine squared in the first term, you have a quadratic equation. Normally cosine squared would be written in ASCII as cos^2 Theta.
asked on November 26, 2006

algebra
A person asked Does this Trinity go to harvest Church for youth group? and they awnserd yes that what
posted on May 7, 2020 
algebra
In 5th in Mrs.Veronacas class.
posted on May 7, 2020 
MATH
What are the odds in favor of randomly drawing the letter Upper N from the letters in the word REFERENCE
posted on May 3, 2020 
music
This might be a little late but the answers are 1. A 2. C 3. B
posted on March 2, 2020 
math
I need help please I just got homework and I don't understand are all my problems 7/10 2/5 2/3 3/9 8/22 1/2 16/24 12/29 15/45 I have more but I think its a waste of time for you
posted on February 21, 2019 
Help SS!
Thank you
posted on December 19, 2018 
vocabulary
dull
posted on April 28, 2018 
vocabulary
Cruel
posted on April 28, 2018 
Finance
543.98
posted on October 9, 2017 
Geometry
65.3
posted on September 3, 2017 
science
don't know
posted on November 14, 2016 
Political Science
yes
posted on June 9, 2016 
FINANCE
Q1. FV= (1000*.09)+1000= 1090, PV= 1000, n=6, pmt= 140. Cpt I/y= 15.027%. They should be happy because they were making a less (14%) than the 15.027%. Q3. The current yeild is $80 (the coupon) divided by $901.40 (The current market value). Sorry my
posted on April 30, 2016 
Finance
fv= (1000*.09)+1000= 1090, PV=1000, n=6, pmt= 140 cpt i/y= 15.027%
posted on April 30, 2016 
Chemistry
The following system is at equilibrium: A(s)+4B(g)⇌C(g) Classify each of the following actions by whether it causes a leftward shift, a rightward shift, or no shift in the direction of the net reaction. (Add more A)(Remove some A)(Double the
posted on April 21, 2016 
physics
Polarized light is incident on a sheet of polarizing material and only 22% of the light gets through. Find the angle between the electric field and the transmission axis
posted on April 4, 2016 
science
I also go to connexus
posted on February 16, 2016 
History on Middle Ages(PLEASE HELP NOW)
Me TOO.
posted on February 8, 2016 
Maths
20,00 will be the answer to the question
posted on November 11, 2015 
social studys
i think is 3
posted on October 2, 2015 
Math
Oh I'm stupid, I actual answer is the hundredths is divided into 2000 peices, and then you take something and another something, put those poopies together and boomshakalaka!
posted on September 16, 2015 
4th grade math
24r1
posted on May 14, 2015 
algebra (check my answers?)
looks good
posted on February 27, 2015 
3rd grade math
36 / 1.3 =27.69(round up) 28 color pictures
posted on February 27, 2015 
3rd grade math
11/42
posted on February 27, 2015 
math
8 x .50 =4 + 8= $12 12 x .20 =2.4 12= $9.60 9.60 x .15 = 1.44 + 9.60= $11.04 11.04 x .60 = 6.62 11.04= $4.42 final price.
posted on February 27, 2015 
math
You have to multiply the 20 min by the number of student in the class which are 25. Then take the minutes and devide them by the number of minutes in an hour. 20 x 25 = 500 minutes 500/60 = 8.3333 (round down) 8 hrs
posted on February 27, 2015 
3rd grade math
Thank you Reed and Nour
posted on February 27, 2015 
3rd grade math
:) lol. Thanks again
posted on February 27, 2015 
Accounting
$273.49 x .35= 95.7215 273.49 + 95.7215=$369.21
posted on February 27, 2015 
Accounting
$5.12 plus 55%= $7.94 price per square yard.(rounded up) 5.12 x .55= 2.816 2.816 + 5.12= 7.94
posted on February 26, 2015 
3rd grade math
I mean the 2/3 of the musicians are girls.
posted on February 26, 2015 
3rd grade math
Steve, Thank you. THat is part of the question that is not needed to solve the problem.
posted on February 26, 2015 
English
is this correct parallel sentence: When the movie Star Wars premiered in 1977, it was both surprising and revolution in its special effects.
posted on January 29, 2015 
Math
Sorry for 2 messages. I accidently hit the send button while i was typing!XD
posted on September 23, 2014 
Math
the hundredths grid is divided into 100 pieces. Now, you shade a whole grid completely. Then , you shade in 65 pieces of another grid to show 1.65. Then, show another grid with 98 pieces shaded in. Don't forget to put in the subtraction sign!! And now your
posted on September 23, 2014 
Math
the hundredths grid is divided into 100 pieces. Now, you shade a whole grid completely. Then , you shade in 65 pieces of another grid to show 1.65.
posted on September 23, 2014 
math prob.
Why is 72 on monday
posted on December 9, 2013 
geometry
im still not sure on how to do this
posted on May 8, 2013