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Questions Asked on March 28, 2010

If 50.0 g of silicon dioxide is heated with an excess of carbon, 27.9g of silicon carbide is produced.SiO2(s) + 3C(s) --> SiC(s)
1. 3 answers
2. asked by Kim
3. 8,872 views
When 84.8 g of iron(III) oxide reacts with an excess of carbon monoxide, iron is produced.Fe2O3(s) + 3CO(g) ==> 2Fe(s) + 3CO2(g)
1. 5 answers
2. asked by Kim
3. 8,744 views
The equation below shows the incomplete combustion of ethene.C2H4(g) + 2O2(g) ==> 2CO(g) + 2H2O(g) If 2.70 mol C2H4 is reacted
1. 3 answers
2. asked by Keith
3. 7,835 views
If θ is an angle in standard position and itsterminal side passes through the point (−3,2), find the exact value of cscθ . I
1. 2 answers
2. asked by Rony
3. 7,417 views
In clinical lab reports, some concentrations are given in mg/dL. Convert a Ca2+ concentration of 3.5 mg/dL to weight/volume
1. 3 answers
2. asked by Jen
3. 4,267 views
2 complementary angles are in the ratio of 5:13. Find the measure of each angle?
1. 3 answers
2. asked by kim
3. 3,411 views
A COLONY OF BACTERIA IS GROWN UNDER IDEAL CONDITIONS IN A LAB SO THAT THE POPULATION INCREASES EXPONENTIALLY WITH TIME. At the
1. 2 answers
2. asked by Phillip
3. 2,924 views
Calculate the molar heat of neutralization in kJ/mol of the reaction between HA and BOH given the following information:The
1. 1 answer
2. asked by Aaron
3. 2,340 views
Which color scheme provides the least ammount of contrast?A. monochromatic B.simple triad C. complementary D. split
1. 1 answer
2. asked by jon
3. 2,129 views
A piece of plexiglass is in the shape of a semi-circle with radius 2m. Determine the dimensions of the rectangle with the
1. 1 answer
2. asked by Erin
3. 2,097 views
I need help finding the center and latus rectum of the equation: 3y^2 - 2y + x + 1 = 0
1. 2 answers
2. asked by dcw
3. 1,885 views
If equal masses of O2 and N2 are placed in identical containers at the same temperature, which of the following statements is
1. 1 answer
2. asked by Donna
3. 1,857 views
Physics force of friction questiona shuffle board disk is accelerated to a speed of 5.8m/s and released. if the coefficient of
1. 4 answers
2. asked by jake
3. 1,848 views
use the given information to solve the triangle.C= 85 degrees 20' a = 35 c = 50 I know that I have to find A,B,b but I do not
1. 3 answers
2. asked by Mark
3. 1,843 views
classify each of the following as a lewis acid or base:Cl- BeCl2 B(CH3)3 P(Ch3)3 Cl- is an acid right? i'm not sure i understand
1. 2 answers
2. asked by Katie
3. 1,833 views
A ball is dropped from a height of 20m and rebounds with a velocity which is 3/4 of the velocity with which it hit the ground.
1. 4 answers
2. asked by Edwin
3. 1,741 views
Use the Standard Normal Distribution table to find the indicated area under the standard normal curve.Q1: Between z = 0 and z =
1. 1 answer
2. asked by looking for someone to varify my work please
3. 1,676 views
write a balanced chem equation for solid lead (II) sulfide reacts with aq hydrochloric acid to form solid lead (II) chloride and
1. 1 answer
2. asked by jen
3. 1,644 views
Two very long, straight, parallel wires separated by distance d carry currents of magnitude I in opposite directions. Find the
1. 1 answer
2. asked by Lee
3. 1,621 views
A light rigid bar is suspended horizontally from two vertical wires, one of steel and one of brass. Each wire is 2.00m long. The
1. 1 answer
2. asked by Edwin
3. 1,617 views
Find the critical numbers of the function.f(x) = x^-2ln(x)
1. 1 answer
2. asked by Morgan
3. 1,513 views
4. Write the balanced equation for CH4+Cl2„_CH2Cl2+HCl.5. Using the equation in problem 4 if 6.00 g of CH4 are mixed with 6.00
1. 1 answer
2. asked by Kathleen
3. 1,511 views
A particular household ammonia solution (d = 0.97 g/mL) is 6.8% NH3 by mass.How many milliliters of this solution should be
1. 1 answer
2. asked by anonymous
3. 1,499 views
PLEASE HELP!!csc(theta)= -3/2 3pi/2 < theta < 2pi Find: sin(theta)= _____ ? cos(theta)= _____ ? tan(theta)= _____ ? cot(theta)=
1. 2 answers
2. asked by jh
3. 1,492 views
wich is not a prime number 11 21 31 41
1. 3 answers
2. asked by ikd
3. 1,451 views
cot(theta)= 3pi < theta < 3pi/2 Find: sin(theta)= -1 ? cos(theta)= -3 ? tan(theta)= 1/3 ? sec(theta)= -1/3 ? csc(theta)= -1 ?
1. 5 answers
2. asked by jh
3. 1,437 views
Choose all of the following statements about the equilibrium constant K that are true:(a) If the K value for a reaction is > 1
1. 1 answer
2. asked by James
3. 1,363 views
1.) What must be the molarity of an aqueous solution of trimethylamine (CH3)3Nif it has a Ph of 11.04? Kb = 6.3*10^-5 if someone
1. 1 answer
2. asked by anonymous
3. 1,356 views
Determine your distance traveled and displacement if you walk 100m forward and then 35m backward
1. 2 answers
2. asked by Marly
3. 1,354 views
Hydrogen and oxygen react according to the equation: 2H2 + O2 -> 2H2O.According to Avogadro's law, how many liters of hydrogen
1. 2 answers
2. asked by Jen
3. 1,332 views
The Pith balls may be positive, negative or neutral.Four pith balls are suspended by insulated threads. The following reaction
1. 2 answers
2. asked by Sagal
3. 1,308 views
I have to create a slide show of 7-10 slides about urbanization, yet I am confuse on where to start. I also have to discuss the
1. 2 answers
2. asked by Nary
3. 1,288 views
1.Choose a movie or a performance you saw recently and write down your story in the blanks.I like watching movies. I saw
1. 1 answer
2. asked by rfvv
3. 1,232 views
Business Law Exam 210True Or False questions. 1. Both "commom law: contracts and UCC contracts are subject to the plain menaing
1. 4 answers
2. asked by Jason
3. 1,192 views
Can you please check the following questions as I need to prepare them for tomorrow. Thank you very much in advance.1) Examine
1. 1 answer
2. asked by Franco
3. 1,170 views
Find constants a,b, and c such that the function f(x)=ax^3+bx^2+c will have a local extremum at (2,11)and a point of inflection
1. 0 answers
2. asked by Wayne
3. 1,147 views
The speed of light is the same for all observers, and the laws of physics are the same for all observers in uniform motion.
1. 0 answers
2. asked by Anonymous
3. 1,124 views
A column packing for chromatography consists of a mixture of two types of particles. Assume that the particles in the batch
1. 1 answer
2. asked by Simon
3. 1,116 views
While researching energy values of fuels, a chemist designed an experiment to find out the heat of combustion of pentane. Using
1. 0 answers
2. asked by sarah
3. 1,111 views
I am so confused,i have no idea what these areWhen resizing an image for display on a computer monitor you should reduce its
1. 1 answer
2. asked by fred
3. 1,101 views
using this equation: CH4+2Cl2-> CH2Cl2+2HCl. If 6.00g of Ch4 are mixed with 6.00g of Cl2, how much HCl can be made?
1. 1 answer
2. asked by jill
3. 1,098 views
Between 1968 and 1980, the US economy experienced a slowdown in productivity growth. However, since the mid 1980s, the economy
1. 0 answers
2. asked by Ismael
3. 1,064 views
Section 5.3: Normal Distributions: Finding ValuesAnswer the questions about the specified normal distribution. Q1: The lifetime
1. 2 answers
2. asked by looking for someone to varify my work please
3. 1,054 views
Given the initial concentrations of 0.10 atm NO2 and 0.10 atm N2O4 in a 1.0 L flask, what will be the equilibrium partial
1. 3 answers
2. asked by AMI
3. 1,049 views
How do you know if a quadratic equation will have one, two, or no solutions? How do you find a quadratic equation if you are
1. 2 answers
2. asked by GGIFT
3. 1,044 views
We use 'Yours sincerely' or 'Sincerely urs.' at the end of a letter. Then what is the full form of 'Yours sincerely'?1. I am
1. 2 answers
2. asked by rfvv
3. 1,021 views
The pH of saturated Sr(OH)2 (aq) is found to be 13.12. A 10.0 mL sample of saturated Sr(OH)2 (aq) is diluted to 250.0 mL in a
1. 2 answers
2. asked by anonymous
3. 1,019 views
E2 (total) of rod (of length L = 9.15 mm) = 4.18 ×10^3 V/m. E1=1.76 x 10^3. E3=1.57 x 10^3. The rod consists of three sections
1. 0 answers
2. asked by Shawn
3. 1,018 views
Train A and B are traveling in the same direction on parallel tracks. Train A is traveling at 100 miles per hour and train B is
1. 1 answer
2. asked by KiKi
3. 1,012 views
How man joules are required to increase the temperature of 1 kg of granite by 1000K using 790 joule/kilogram-kelvin as the
1. 0 answers
2. asked by John
3. 993 views
what are the steps on how to balance Al + O2 -----> Al2O3
1. 1 answer
2. asked by Anna
3. 966 views
Find the magnitude and direction angle of the vector v.v= 8(cos135 degrees i + sin135 degrees J) I think that the answer is v= 5
1. 2 answers
2. asked by Hannah
3. 957 views
In 1992, the life expectancy of males in a certain country was 73.5 years. In 1996, it was 75.7 years. Let E representthe life
1. 1 answer
2. asked by KiKi
3. 932 views
Bert is planning to open a savings account that earns 1.6% simple interest yearly. He wants to earn exactly $240 in interest
1. 1 answer
2. asked by melanie
3. 926 views
If the same volume (130-mL) of the buffer were 0.265 M in NH3 and 0.400 M in NH4Br, what mass of HCl could be handled before the
1. 1 answer
2. asked by Kyle
3. 915 views
i have to do a power point presentation of 6-9 slides. no more than 1/3 of the presentation can be pics. i have to include
1. 2 answers
2. asked by nicole
3. 909 views
discuss how world war I affected the lives of americans. how did it change american social realities regarding women the family
1. 2 answers
2. asked by Dellaine
3. 909 views
.12M Lactic Acid (HC3H5O3, Ka=1.4x10^-4) is mixed with .10M NaC3H5O3 to form 1.00L solution.A. Calculate the pH of the solution
1. 2 answers
2. asked by Emma
3. 904 views
(a) What is the tangential acceleration of a bug on the rim of a 6.0 in. diameter disk if the disk moves from rest to an angular
1. 1 answer
2. asked by Kelsey
3. 904 views
Solve9(w-2)=-18 9w-18=-18 9w=0 w=0 Is this correct?
1. 1 answer
2. asked by KiKi
3. 888 views
2.) A particular vinegar is found to contain 5.9% acetic acid by mass.What mass of this vinegar should be diluted with water to
1. 1 answer
2. asked by anonymous
3. 879 views
1. He died young.2. He died when he was young. 3. When he was young, he died. (Are they all the same?) 4. a strong wind, a high
1. 2 answers
2. asked by rfvv
3. 877 views
a fluid flows through a horizontal pipe of varying cross-section. Assuming the flow is streamline and applying the bernoulli
1. 0 answers
2. asked by Edwin
3. 874 views
Which pairs of substances will form a buffer when mixed in equal concentrations?
1. 1 answer
2. asked by krissy
3. 871 views
iN 1993, THE LIFE EXPECTANCY of males was 68.6 years. In 2000, it was 71.1 years. Let E represent the life expectancy in year t
1. 3 answers
2. asked by bob
3. 849 views
The boiling point of a liquid at atmospheric pressure is the temperature:a. at which bubbles of vapor expand within the liqud b.
1. 1 answer
2. asked by Donna
3. 793 views
A model train is a scale model created from actual measurements. The scale factor for HO or Half Zero model trains is 1:87. A
1. 1 answer
2. asked by Anonymous
3. 793 views
Scientists can determine what distant stars are made of, as well as their temperatures and velocities, by looking atA absorption
1. 0 answers
2. asked by Anonymous
3. 793 views
Calorie LevelFiber Type High Calorie Low Calorie Totals High Fiber 18 4 22 Medium Fiber 23 6 29 Low Fiber 12 21 33 Totals 53 31
1. 6 answers
2. asked by megan
3. 790 views
two angles are complementary. the sum of the measure of the first angle and half the second angle is 87 degrees. find the
1. 1 answer
2. asked by ron
3. 790 views
The first excited state of the hydrogen atom is separated from the ground state by 10.2 eV.(a) At what wavelength does this
1. 2 answers
2. asked by Hobson
3. 788 views
A special prototype model aeroplane of mass 400g has a control wire 8cm long attached to its body. The other end of the control
1. 0 answers
2. asked by Edwin
3. 780 views
Use the law of cosines to find the angle of Q between the given vectors.v=3i + j w=2i - j
1. 1 answer
2. asked by Hannah
3. 766 views
the ratio of 8ft. to 4 yd
1. 1 answer
2. asked by Vickie
3. 753 views
find the two ordered pairs of this equation.y=5/3x+8 then give the slope and y intercept. I know the slope is rise over run and
1. 1 answer
2. asked by KiKi
3. 749 views
DigiCom wants to drop the effective rate of interest on its credit card by 2%. If it currently charges a nominal rate of 8%
1. 3 answers
2. asked by Amy
3. 748 views
I need to fill in the blanks with the correct indirect or direct pronouns.Voy a compara esta corbata para mi papa. Voy a
1. 1 answer
2. asked by tina
3. 748 views
Retrograde motion describes the backward motion of the stars relative to earth
1. 1 answer
2. asked by b
3. 738 views
PLEASE HELP!!sin(theta)= 1/3 pi/2 < theta < pi Find: cos(theta)= ______ ? tan(theta)= ______ ? cot(theta)= ______ ? sec(theta)=
1. 2 answers
2. asked by jh
3. 733 views
The radius needed to create a sphere with a given volume V can be approximated by the equationr = 0.6(V)^1/3. Find the radius of
1. 1 answer
2. asked by Anonymous
3. 724 views
IN the polystyrene beaker, mix 20mL of 0.1 M Acetic acid and 25mL of 0.1M Sodium Acetate and immediately measure the pH. Remove
1. 1 answer
2. asked by Saira
3. 724 views
unsocialized, spontaneous, self interested component of our personalitiesa Soul b Aura c "I" is the answer b? i tried to find it
1. 3 answers
2. asked by EMH
3. 717 views
You meet a person with prescription glasses of +0.55 dpt.What is the near point of this person? Express the result as a positive
1. 1 answer
2. asked by Sandra
3. 714 views
A model train is a scale model created from actual measurements. The scale factor for HO or Half Zero model trains is 1:87. A
1. 3 answers
2. asked by Anonymous
3. 713 views
the body mass index is given by the formula, or model, I=700w/h(2), where w= weight and h = height in inches. Jerome is 76
1. 1 answer
2. asked by ron
3. 710 views
If the amplitudes of the two waves are 3 units and 1 unit respectively, show by the principle of superposition that the ratio of
1. 1 answer
2. asked by Edwin
3. 707 views
Which color arrangement wouldcreate the deepest senseof space?A. red,orange,blue B. Green violet, blue C.Yellow,
1. 1 answer
2. asked by Jake
3. 705 views
Quadratic equations can be solved by graphing, using the quadratic formula, completing the square, and factoring. What are the
1. 2 answers
2. asked by GGIFT
3. 695 views
What volume of 0.200 M Fe(NO3)3 is needed to make 50ml of o.oo200M Fe(NO3)3?
1. 2 answers
2. asked by amber
3. 694 views
1gm of AgNO3 is dissolved in 50ml of h2o. it is titrated with 50ml od sol. agi is precipitated is filtered of.the exces of ki is
1. 1 answer
2. asked by debby
3. 693 views
Retrograde motion describe theA backward motion of the stars relative to Earth B uniform circular motion exhibited by the
1. 2 answers
2. asked by B
3. 691 views
Starting with a hypothetical population of 14,000 people and an even age distribution (1,000 in each age group from 1-5 to 66-70
1. 1 answer
2. asked by sarah
3. 682 views
The mean score on a Math exam was 50% and the standard deviation was 10%. Assume the results were normally distributed.(a) What
1. 1 answer
2. asked by kevin
3. 681 views
What is the major axis and the domain of the equation 9x^2 + 16y^2 - 36x + 96y + 36 = 0 ?
1. 0 answers
2. asked by dcw
3. 678 views
The boiling point of water at 756 mm Hg is 99.85 degree C. What mass percent of surcrose (C12H22O11) should be present to raise
1. 1 answer
2. asked by Donna
3. 675 views
A solution is prepared by dissolving 0.2222 (¡¾0.0002) g of KIO3 in 50.00 (¡¾0.05) mL.(i) Calculate the molar mass of KIO3
1. 0 answers
2. asked by Hobson
3. 670 views
Woodrow Wilson faced a number of obstacles in making his Fourteen Points a reality including several of his own making and some
1. 0 answers
2. asked by Dellaine
3. 669 views
when doing a paper chromatography lab, my class used a solvent with a neutral pH, which my teacher said would help separate the
1. 1 answer
2. asked by chrissy
3. 668 views
NaCl dissociates completely in water. Therefor the total number of particles in a 1.0 m NaCl solution is no longer 6.02 X 10^23.
1. 1 answer
2. asked by Heather
3. 667 views
A clean glass capillary tube is held vertically in water raised to a height of 7cm. The tube is down depressed and only 5cm of
1. 0 answers
2. asked by Edwin
3. 665 views

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