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Questions Asked on December 8, 2010

What is the molarity of ZnCl2 that forms when 30.0g of zinc completely reacts with CuCl2 according to the following reaction?
1. 3 answers
2. asked by Lisa, Help needed!
3. 18,857 views
If the volume of a cube is increasing at 24 in^3/min and the surface area of the cube is increasing at 12 in^2/min, what is the
1. 3 answers
2. asked by Anna
3. 11,727 views
What is the linearization of f(x)=e^x at x=1?
1. 1 answer
2. asked by Anna
3. 9,133 views
One brand of laundry bleach is an aqueous solution containing 4.00% sodium hypochlorite (NaOCl) by massWhat is the molarity of
1. 2 answers
2. asked by Lisa, Help needed!
3. 7,636 views
What is the theoretical yield of PI3 from the reaction of 27.0 g of P and 68.0 g I2? 2P(s)+3I2(s) 2PI3(s)
1. 2 answers
2. asked by Becca
3. 5,195 views
A 22.5 gram sample of ammonium carbonate contains ? mol of ammonium ions?
1. 4 answers
2. asked by Gina
3. 5,131 views
CaO(s) + 3C(s) > CaC2(s) + CO(g)deltaHrxn = +464.8 kJ/mol-rxn Is the reaction endothermic or exothermic? What is the enthalpy
1. 2 answers
2. asked by Jake
3. 4,985 views
A particle is moving around the unit circle (the circle of radius 1 centered at the origin). At the point (.6 , .8), the
1. 1 answer
2. asked by Anna
3. 4,255 views
A stock room worker pushes a box with mass 11.2 kg on a horizontal surface with a constant speed of 4.50 m/s. The coefficient of
1. 2 answers
2. asked by Yosh
3. 4,114 views
magnesium has 3 isotopes. Magnesium-24 has a percent abundance of 78.99%. Magnesium-26 has a percent of 11.01%. what is the
1. 3 answers
2. asked by monique n
3. 3,569 views
Calculate the energy of a photon of light with a wavelength of 360 nm?
1. 2 answers
2. asked by Becca
3. 3,429 views
The number of customers who enter a supermarket each hour is normally distributed with a mean of 600 and a standard deviation of
1. 1 answer
2. asked by Tony
3. 3,385 views
A sample of unknown ore was analyzed and fgound to contain 12.7% Al, 19.7% N,and 67.6% O. What is the empirical formula of this
1. 4 answers
2. asked by Becca
3. 3,316 views
Find all the vectors that are perpendicular to (1,4,4,1) and (2,9,8,2).
1. 1 answer
2. asked by Drake
3. 3,301 views
What is the empirical formula of a compound that contains 27.0%S, 13.4%O,and 59.6%Cl by mass?
1. 2 answers
2. asked by Kay
3. 3,196 views
An electron in a cathode-ray tube is traveling horizontally at 2.10 x 109 cm/s when deflection plates give it an upward
1. 2 answers
2. asked by Avalon
3. 3,160 views
If the corresponding angles of 2 polygons are congruent and the lengths of the corresponding sides of the polygons are
1. 5 answers
2. asked by Dobby
3. 3,120 views
meeranyA flat (unbanked) curve on a highway has a radius of 220.0 Ill. A car rounds the curve at a speed of 25.0 m/s. (a) What
1. 3 answers
2. asked by aleen
3. 2,910 views
A 50.0 mL sample of 6.0 M HCL is dulited to 200.0 mL. What is the new concentration of the acid?
1. 1 answer
2. asked by Sa ndra
3. 2,770 views
How do we know the ith of an invertible matrix B is orthogonal to the jth column of B^-1 , if i is not equal/unequal to j?
1. 1 answer
2. asked by Nolan
3. 2,535 views
What property of paradichlorobenzene may convince you that it is an ingredient in mothballs?Please help. I have no idea. I did
1. 1 answer
2. asked by John
3. 2,500 views
A violin has an open string length (bridge to nut) of L=32.7 cm. At what distance x from the bridge does a violinist have to
1. 1 answer
2. asked by Nadya
3. 2,342 views
Two straight and parallel wires of length 1.0 m carry a current - the first carries a currecnt of 9.0 A while the other wire
1. 2 answers
2. asked by Jim
3. 2,298 views
If the corressponding angles of 2 polygons are congruent and the lengths of the corresponding sides of the polygons are
1. 1 answer
2. asked by Please help
3. 2,193 views
A string is cut in half,and one of the halves is used to bundle newspapers. Then one fifth of the remaining string is cut off.
1. 4 answers
2. asked by Melea
3. 2,125 views
Mercury-197 is used for kidney scans and has a half-life of 3 days. if the amount of mercury-197 needed for a study is 1.0 grams
1. 1 answer
2. asked by monique n
3. 2,083 views
the maximum height a typical person can jump from a crouched start is about 60cm. By how much does the gravitational potential
1. 3 answers
2. asked by physics
3. 2,057 views
Calculate the atomic mass of iridium. Iridium has two isotopes. Iridium-191 has a mass of 191.0 amu and a percent abundance of
1. 2 answers
2. asked by monique n
3. 2,038 views
how many grams of Na are needed to react with H2O to liberate 400mL of H2 gas at STP?
1. 3 answers
2. asked by justin
3. 1,855 views
The lengths of pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days. Out of 50
1. 2 answers
2. asked by Terry
3. 1,832 views
Iodine-131 is used to destroy thyroid tissue in the treatment of an overactive thyroid. the half-life of iodine-131 is 8.02
1. 4 answers
2. asked by monique n
3. 1,786 views
Suppose all of the apples have a mass of 0.10 kg. If apple (A) is sitting on the ground, what is its potential energy?A) 0.10 J
1. 3 answers
2. asked by Jon
3. 1,768 views
A 30 N fishing pole is 2.00 m long and has its center of gravity .350 m from the heavy end. A fisherman holds the end of the
1. 4 answers
2. asked by Jennifer
3. 1,752 views
The path of a large stone fired from a catapult can be modeled by y= -0.00545x^2+1.145xwhere x is the distance the stone
1. 1 answer
2. asked by Shannon
3. 1,727 views
An equilateral triangle s divided into 4 congruent equilateral triangles. What method can be used to find the area of the larger
1. 1 answer
2. asked by Danny
3. 1,614 views
As you know, a cube with each side 4 m in length has a volume of 64 m3. Each side of thecube is now doubled in length. What is
1. 1 answer
2. asked by Coty
3. 1,558 views
f(x) = 9 sqrt(x)e*(-x)
1. 1 answer
2. asked by Mike
3. 1,499 views
A vacuum cleaner has a measured sound level of 75.7 dB. What is the intensity of this sound? Answer in units of W/m^2
1. 1 answer
2. asked by Tammi
3. 1,473 views
toy rubber balls are packaged in a circular cylinder that holds 3 balds. the diameter of each ball is 3.7 cm find the volume of
1. 1 answer
2. asked by Frida
3. 1,459 views
mike has two mats in the shape of triangles. the scale factor of the two mats is 7/9. what is the ratio of the perimeters?
1. 3 answers
2. asked by laura
3. 1,446 views
At t = 0, a 785 g mass at rest on the end of a horizontal spring (k = 125 N/m) is struck by a hammer, which gives the mass an
1. 1 answer
2. asked by Anon
3. 1,441 views
Which is not a ground state electron configuration?A. 1s2 B. 1s2 2p1 C. 1s2 2s2 D. 1s2 2s2 2p1
1. 3 answers
2. asked by Jerome
3. 1,408 views
Calculate the weight percent of water in NiSO4 6H2O, how to calculate it?
1. 2 answers
2. asked by Brittany
3. 1,403 views
Determine the number of bromide ions in solution when 4.23 g of magnesium bromide and 1.21 g of potassium bromide are dissolved
1. 2 answers
2. asked by Stacy
3. 1,391 views
In an equilateral triangle, what is the difference between the sum of the exterior angles and the sum of the interior angles?
1. 2 answers
2. asked by Alexis
3. 1,387 views
Without oxygen, cellular respiration grinds to a standstill, although glycolysis can continue to make some ATP anaerobically for
1. 0 answers
2. asked by Brenda
3. 1,356 views
What is the original molarity of an aqueous solution of ammonia (NH3) whose pH is 11.10 at 25 degrees C? (Kb for NH3=1.8 x
1. 1 answer
2. asked by Natalie
3. 1,325 views
A uniform meter stick of mass 40 g is used to suspend three objects as follows: 20 g at 0.13 m, 25 g at 0.41 m and 40 g at 0.64
1. 4 answers
2. asked by applebottom
3. 1,306 views
A 0.480 kg pendulum bob passes through the lowest part of its path at a speed of 3.10 m/s. (b) When the pendulum reaches its
1. 0 answers
2. asked by kaitlyn
3. 1,272 views
How many moles of carbon monoxide gas are produced when 2.88 moles of SnO2(s) react with excess carbon according to the equation
1. 1 answer
2. asked by Lauren K.
3. 1,272 views
My teacher uses the online homework ARIS and the question is write the balanced equation of Mn3(PO4)2: i have enter the answer
1. 1 answer
2. asked by Taylor
3. 1,254 views
16. ¿Pagaste sólo cinco dólares por la sudadera?a. !Qué caro! b. !Qué verde! c. !Qué ganga! d. !Qué grande! C 17.
1. 1 answer
2. asked by mysterychicken
3. 1,183 views
Use lagrange multipliers to find the point on the plane x-2y 3z-14=0 that is closet to the origin?(try and minimize the square
1. 1 answer
2. asked by Justin
3. 1,179 views
Discuss in detail, one way in which atomic nuclear decay takes place. What is the significance of atomic nuclear decay? Analyze
1. 3 answers
2. asked by jane
3. 1,174 views
the quality control inspector of a production plant will reflect a batch of syringes if two or more defectives syringes are
1. 1 answer
2. asked by gaio
3. 1,173 views
The price of admission for a concert was $9 for adults and $4 for children. Altogether, 1770 tickets were sold, and the
1. 3 answers
2. asked by Julie Jam
3. 1,170 views
Lead is a toxic metal that affects the central nervous system. A Pb-contaminated water sample contains 0.0011 % Pb by mass. How
1. 2 answers
2. asked by Lisa, Help needed!
3. 1,153 views
What is the index of a radical? When working with radicals, can the radicand be negative when the index is odd? Can it be
1. 0 answers
2. asked by Anonymous
3. 1,150 views
How to write 5,800 million metric tons in standard form and in scientific notation?
1. 2 answers
2. asked by Robert
3. 1,150 views
Find the area of the region under the graph of the function f on the interval [-1, 2].f(x) = 6x + 1 bound by the x axis
1. 1 answer
2. asked by peter
3. 1,141 views
What is the density of CO2 gas at -25.2 degrees celsius and 98.0kPa?
1. 2 answers
2. asked by lavonne
3. 1,138 views
most of earth's landmass is in the northern hemisphere. how might this influence Earth's overall albedo duringa)June b)January I
1. 2 answers
2. asked by Sydney
3. 1,128 views
Exposure to high doses of microwaves can cause tissue damage. Estimate how many photons with a wavelength = 12cm, must be
1. 3 answers
2. asked by Jake
3. 1,123 views
A 400 g solution is 25% salt. How much salt must be added to produce a solution that is 40% salt?
1. 1 answer
2. asked by abc
3. 1,122 views
Which of the following has 2 parallel bases that are not polygons?a. Cone b. Prism c. Pyramid d. Cylinder
1. 2 answers
2. asked by SquarePants
3. 1,121 views
A sample of ammonina gas at 65.5 degrees celsius and 524 torr has avolume of 15.31 L. What is it's volume at -15.8 degrees
1. 1 answer
2. asked by lavonne
3. 1,107 views
A basketball team has a season record of five wins and two losses. If the team continues this kind of performance, how many wins
1. 2 answers
2. asked by Jenea
3. 1,064 views
An Antique dealer visited three shops. she spend $25 at the first shop. At the second shop, she spent half of her remaining
1. 1 answer
2. asked by Anonymous
3. 1,053 views
In what ways did Europeans' desire for trade with Asia affect the western hemisphere?
1. 4 answers
2. asked by andrea
3. 1,052 views
31. (II) a shotputter throws the shot with an initial speed of 15.5m/s at a 34.0* angle to the horizontal. Calculate the
1. 1 answer
2. asked by Anonymous
3. 1,047 views
if mBA=44 find the measure of mBA
1. 0 answers
2. asked by emil
3. 1,029 views
· Read two of the five paragraphs on the second page of this appendix. Write a brief paragraph of about 150 words in which you
1. 4 answers
2. asked by Jen
3. 1,020 views
At a quality control checkpoint on a manafacturing assembly line, 10% of the items failed check A, 12% failed check B, and 3%
1. 1 answer
2. asked by Rena
3. 1,001 views
How is the energy that reaches earth's surface returned to space?is is by radiation?
1. 1 answer
2. asked by Sydney
3. 997 views
brandon launches a projectile at an angle of 75 degrees above the horizontal, which strikes the ground a certain distance down
1. 1 answer
2. asked by sabina
3. 997 views
What is the longest wavelength light capable of ionizing a hydrogen atom in the n = 4 state?i know that Solve h c/L =
1. 2 answers
2. asked by VJC
3. 991 views
ladder of mass m and length l leans against a frictionless wall at an angle of 60 degrees. The coefficient of static friction
1. 1 answer
2. asked by katie
3. 980 views
2. Given the following equation, C2H5OH(l) + 3 O2(g)---> 2 CO2(g) + 3 H2O(l)How many liter of CO2 are expected in the combustion
1. 1 answer
2. asked by hannah
3. 980 views
___(1)___ (ser) una noche suave de primavera. Tumbados en el césped (lying on the grass) María y Jose ___(2)___ (observar,
1. 5 answers
2. asked by whitney
3. 975 views
The mass of the solid inside the sphere: x^2+y^2+z^2=1, above the xy plane and below the cone z=SqRT(x^2 + y^2. It's mass
1. 0 answers
2. asked by Justin
3. 971 views
In an experiment, plants were grown under colored filters that allowed equal amounts of light of different colors to strike
1. 1 answer
2. asked by Brenda
3. 967 views
A 10N meterstick is suspended by two sping scales, one at the .08 m mark and the other at the .9 m mark. If a weight of 5N is
1. 1 answer
2. asked by Jennifer
3. 959 views
You react ammonia and oxygen, and at the end of the experiment you find that you produced 20.7 g of water and have 8.52 g of
1. 1 answer
2. asked by Adog
3. 953 views
ascuba diver is 180 ft below sea level and rises to the vsurface at a rate of 30 ft/min.How long will the diver take to reach
1. 4 answers
2. asked by hobbies
3. 933 views
Hi need help with need thesis. My thesis before was "Justice is not being severed in the case of the Somali pirates. Truth is
1. 5 answers
2. asked by Mariae
3. 932 views
I following is a paragraph regarding my experience with credit cards. I now need to bold the nouns and pronouns and underline
1. 1 answer
2. asked by Leigh
3. 929 views
Please tell me if these are right!What are the [H3O+] and [OH-] for a solution with the following pH values? a. 10.0 I got
1. 1 answer
2. asked by Jessica
3. 925 views
i need to find 5 books that support development of gender identity by portraying males and females in diverse roles. but it has
1. 5 answers
2. asked by sasha
3. 922 views
Initially, you hear the siren at 90 dB. When the distance between you and the ambulance is a quarter of what it was initially,
1. 1 answer
2. asked by Nadya
3. 921 views
WHATS A VERB
1. 2 answers
2. asked by sam
3. 917 views
Hi,can I have your help? I'm just trying to solve a few Dilution Solution problems. I'm stuck on these two,and I wish you could
1. 1 answer
2. asked by Cliff
3. 914 views
A projectile is fired straight up from a cliff which is 200 feet above ground with an initial velocity of 220 ft/sec. Assume
1. 1 answer
2. asked by Marina
3. 913 views
How many atoms of lead (Pb) are present in 0.75 moles?
1. 0 answers
2. asked by nicola
3. 913 views
A projectile is fired straight up from a cliff which is 200 feet above ground with an initial velocity of 220 ft/sec. Assume
1. 3 answers
2. asked by Marina
3. 908 views
A convex mirror with focal length of -20 cm forms an image 12 cm behind the surface. Where is the object located as measured
1. 0 answers
2. asked by Max
3. 907 views
one number is 6 more than another. their product is 91. what is the number?
1. 4 answers
2. asked by mike
3. 901 views
Kenneth works for albertsons as a cashier. He earns $9.25 per hours and he works 20 hours each week. Write an expression that
1. 1 answer
2. asked by Matt
3. 896 views
What is the [OH-] of a saturated solution of Zn(OH)2? Ksp=1.8 x 10^-14. i'm just confused on how to start this problem i don't
1. 1 answer
2. asked by Taylor
3. 896 views
A flagpole at a right angle to the horizontal is located on a slope that makes an angle of 12 degrees with the horizontal. The
1. 0 answers
2. asked by marlie
3. 892 views
A 50.0-mL sample of 0.10 M HNO2 is titrated with 0.10 M NaOH. What is the pH after 25.0 mL of NaOHhave been added?
1. 0 answers
2. asked by Eric
3. 881 views

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