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Questions Asked on January 23, 2012

Predict whether the following reactions will be exothermic or endothermicA) N2(g)+ 3H2(g) --> 2NH3(g) B) S(g) +O2(g) ---> SO2(g)
1. 6 answers
2. asked by Kristen
3. 14,382 views
What is the pH of a 2.8 M solution of HClO4?
1. 5 answers
2. asked by katie
3. 9,512 views
the recommended daily allowance of calcium is 1.2 g. calcium carbonate contains 12.0 % calcium by mass. how many grams of
1. 1 answer
2. asked by Anonymous
3. 6,828 views
A solution of NaOH(aq) contains 6.2 g of NaOH(s) per 100.0 mL of solution. Calculate the pH and the pOH of the solution at 25
1. 3 answers
2. asked by katie
3. 5,962 views
The compound potassium carbonate is a strong electrolyte. Write the reaction when potassium carbonate is put into water
1. 1 answer
2. asked by ben
3. 5,076 views
Consider the titration of 100.0 mL of 0.100 M NaOH with 1.00 M HBr. Find the pH at the following volumes of acid added and make
1. 3 answers
2. asked by Sandy
3. 4,268 views
A couple intends to have four children. Assume that having a boy and girl is equally likely event.a) List sample space b) Find
1. 3 answers
2. asked by juan777
3. 4,182 views
A sample of Manganese (II) Chloride has a mass of 19.8 grams before heating, and 12.6 grams after heating until all the water is
1. 2 answers
2. asked by Diana
3. 4,166 views
21. The EU is an example of a trading bloc, or _______, that has a common external tariffand no internal tariffs, and that
1. 2 answers
2. asked by Heather
3. 4,070 views
In a butane lighter, 9.5 of butane combines with 34.0 of oxygen to form 28.7 carbon dioxide and how many grams of water?
1. 2 answers
2. asked by peanut
3. 4,062 views
every week Brady gets $2.50 more for his allowance than Max does. They spend $6 on snacks and save the rest. Brady saves $72,
1. 1 answer
2. asked by t
3. 3,824 views
If Julie bought 8 T-shirts, she would be short $28. If she bought 4 T-shirts and 3 baseball hats, she would have $17 left. If
1. 2 answers
2. asked by t
3. 3,782 views
Find the area of a regular pentagon with a side of 6ft. Give the answer to the nearest tenth.123.9ft2 49.5ft2 61.9ft2 12.4ft2
1. 4 answers
2. asked by Ash
3. 3,736 views
a building in a city has a rectangular base. the lenght of the base measures 70 ft less than twice the width. the perimeter of
1. 2 answers
2. asked by jojo
3. 3,711 views
What was the Declaration of Independence and why was it written?
1. 12 answers
2. asked by Laruen
3. 3,571 views
Find the formula for the compound that contains 72.4% iron and 27.6% oxygen.
1. 2 answers
2. asked by student
3. 3,464 views
Chicago, Illinois has a longitude of 88 degrees West and a latitude of 42 degrees North. Indianapolis, Indiana is located at 86
1. 3 answers
2. asked by Sammi
3. 3,341 views
measurements of carbon 14 taken from linen wrappings of the book of isaiah from the dead sea scrolls indicate that the scrolls
1. 2 answers
2. asked by L.Bianchessi
3. 3,240 views
Some liquids have enough attractions between molecules to form dimers. (Dimers are molecules formed from the combination of
1. 3 answers
2. asked by question
3. 2,841 views
Give the formula of each of the following copper minerals:A. cuprite, copper (I) oxide B. chalcocite, copper (I) sulfide C.
1. 1 answer
2. asked by Tiffany
3. 2,809 views
do the arithmetic and give the answer to the correct number of significant figures. (1.5 x 10^-4 x 61.3) + 2.01 =
1. 2 answers
2. asked by Anonymous
3. 2,790 views
What mass of water must be added to 0.5 mol of glucose to make a solution of 25 percent by mass?The molar mass of glucose is 180
1. 1 answer
2. asked by student
3. 2,530 views
Let C = 2.32 N + 34180 represent the cost (C) of raising a child to 18 years of age, on an income (N). If the cost is $120,000,
1. 2 answers
2. asked by help
3. 2,500 views
Two boats start together and race across a 42 km wide lake and back. Boat A goes across at 42 km/h and returns at 42 km/h. Boat
1. 1 answer
2. asked by john
3. 2,467 views
A 0.5537-g sample containing oxalic acid required 21.62 mL of 0.09377 M NaOH for titration. If the reaction is H2C2O4 + 2NaOH
1. 3 answers
2. asked by Polly
3. 2,415 views
Hey guys! I was hoping that someone could look over my answers & help me out with the ones I didn't get? Thanks :)Directions:
1. 3 answers
2. asked by Ashley
3. 2,368 views
The product of two consecutive positive even numbers is 1368. What are the numbers? (Enter solutions from smallest to largest.)
1. 2 answers
2. asked by Anonymous
3. 2,309 views
prove that sinA/(1+cosA) + (1+cosA)/(sinA) = 2cosecA
1. 1 answer
2. asked by Amir
3. 2,290 views
The measures of 6 of the interior angles of a heptagon are: 120°, 150°, 135°, 170°, 90°, and 125°. What is the measure of
1. 2 answers
2. asked by dana
3. 2,274 views
Quadrilateral KLMN has vertices K(-2,-2), L(1,1), M(0,4), and N(-3,5). It is first translated by (x + 2,y - 1) and then
1. 4 answers
2. asked by Anonymous
3. 2,270 views
If BE bisects measure ABD and measure EBD equals 32 find measure ABD
1. 4 answers
2. asked by Anonymous
3. 2,247 views
A 10.231-g sample of window cleaner containing ammonia was diluted with 39.466 mL of 0.1063 M HCl to reach the bromocresol green
1. 1 answer
2. asked by Tanya
3. 2,056 views
A 100.0-mL aliquot of 0.100 M diprotic acid H2A (pK1 = 4.00, pK2 = 8.00) was titrated with 1.00 m NaOH. Find the pH at the
1. 1 answer
2. asked by Meg
3. 1,976 views
You spend $685 a month on living expenses. If your monthly income is $1500, what percent of your income do you spend on living
1. 1 answer
2. asked by help
3. 1,965 views
A puck on a horizontal, frictionless surface is attached to a string that wraps around a pole of finite radius, as shown in the
1. 1 answer
2. asked by Patrick
3. 1,965 views
The vapor pressure, P, of a certain liquid was measured at two temperatures, T.Represented in a table: T (in Kelvin) -------
1. 1 answer
2. asked by Eric
3. 1,953 views
a car travels 1 km in which each wheel makes 450 revolutions. Find the radius of its wheel
1. 2 answers
2. asked by avanthika
3. 1,944 views
Use the half-angle formulas to determine the exact values of the sine, cosine, and tangent of the angle.67° 30' 7 sin(67°
1. 1 answer
2. asked by kyle
3. 1,926 views
An animal shelter have 1008 cats, dogs, and rabbits. The ratio of the number of dogs to the number of cats in the animal shelter
1. 4 answers
2. asked by Calista
3. 1,895 views
A thermometer of mass 0.0550 kg and of specific heat 0.837 kJ/kg•K reads 15.0°C. It is then completely immersed in 0.300 kg
1. 1 answer
2. asked by chx
3. 1,891 views
The point A (3, 4) is reflected over the line x = 2, and then is reflected over the line x = -4. What are the coordinates of A'?
1. 1 answer
2. asked by dana
3. 1,845 views
Q8: Two sinusoidal waves with the same amplitude of 9.00 mm and the same wavelength travel together along a string that is
1. 1 answer
2. asked by raju
3. 1,803 views
Una makes $64 a week, plus 15 percent of the cost of meals that she serves. Use the equation, y = 0.15x + 64, to predict what
1. 1 answer
2. asked by help
3. 1,699 views
Mike pulls a 4.5 kg sled across level snow with a force of 250 N along a rope that is 35.0° above the horizontal. If the sled
1. 1 answer
2. asked by Mac
3. 1,611 views
Find the surface area of a sphere with a circumference of 40 ft. Round to the nearest tenth.
1. 3 answers
2. asked by Ash
3. 1,599 views
how many different ways can eight cars finish in a race 1st, 2nd, 3rd ?
1. 4 answers
2. asked by theresa
3. 1,557 views
Identify the sentence that uses apostrophes correctly.a) Suzannes car needs’ a new muffler. b) Suzanne's car needs a new
1. 4 answers
2. asked by Michelle
3. 1,515 views
Find the volume of the solid generated by revolving the region bounded by the graphs of the equations about the x-axis. (Round
1. 1 answer
2. asked by NAN
3. 1,463 views
Xe(g) + F2(g) ----uv light---> Xe F2(s)XeF2(g) + 2F2(g) ---catalyst---> XeF6(s) XeF6(s) + H2O(l) ------> Xe O3(s) + 6HF(g)
1. 1 answer
2. asked by Alexandra
3. 1,415 views
Find the volume of the solid generated by revolving the region bounded by the graphs of the equations about the line x = 6.y = 6
1. 1 answer
2. asked by ME
3. 1,412 views
How much aluminum nitrate can be foundwhen 12 g of aluminum react with lead(II) nitrate? Answer in units of mol
1. 2 answers
2. asked by lynn
3. 1,409 views
A small mailbag is released from a helicopter that is descending steadily at 3.00 m/s.(a) After 2.00 s, what is the speed of the
1. 0 answers
2. asked by seanso
3. 1,386 views
Identify the sentence with the correct punctuation.a) Do you have everything - such as extra clothes; for your trip? b) Do you
1. 3 answers
2. asked by Michelle
3. 1,364 views
Write a 3-4 page paper that summarizes your findings from the four (4) scenarios as well as how using Microsoft Excel helped you
1. 0 answers
2. asked by Bilo
3. 1,351 views
THE RATE LAW FOR THE REACTION 2NO + 02 = 2NO2 IS FIRST ORDER IN OXYGEN AND SECOND ORDER IN NO. PROPOSE A MECHANISM IN WHICH EACH
1. 1 answer
2. asked by ALISON
3. 1,350 views
The trend toward two-family income has led toA. policies allowing only one family member to work for a company. B. flexible work
1. 1 answer
2. asked by Heather
3. 1,316 views
Bart had an income of $38,250 last year. If the inflation rate is 4.5%, what is his purchasing power?
1. 1 answer
2. asked by help
3. 1,313 views
A certain substance has a heat vaporization of 47.97 kJ/mol.At what Kelvin temperature will the vapor pressure be 7.50 times
1. 1 answer
2. asked by Angela
3. 1,305 views
Name some of the people who helped winthe Revolution and list their contributions.
1. 3 answers
2. asked by stephanie
3. 1,305 views
11. Often, the _______ the risk, the _______ the rewards.A. higher; higher C. higher; lower B. lower; higher D. faster; quicker
1. 1 answer
2. asked by Heather
3. 1,301 views
Under the spreading chestnut tree the village blacksmith dunks a red-hot horseshoe into a large bucket of 22*C water. How much
1. 2 answers
2. asked by Ben
3. 1,300 views
calculate[OH-],[H+] of a .20 M solution of triethylamine Kb=4.0*10^-4
1. 1 answer
2. asked by chad
3. 1,292 views
we reacted acetic acid with butanol and formed butyl acetate which is supposed to smell like banana but it smelled like
1. 1 answer
2. asked by Bob
3. 1,286 views
What is 29 miles per hour in units of m/s? 1 mile is 5280 feet, 1 meter is 3.3 feet, 1 hour is 60 minutes, and 1 minute is 60
1. 0 answers
2. asked by barrie
3. 1,263 views
1)Which thermochemical equation and data does not agree with the other two written?a) 2NO (g)+ O2 (g) ->2 NO2 (g) deltaH=-169.8
1. 2 answers
2. asked by Rick
3. 1,239 views
The activity of carbon 14 in living tissue is 15.3 disintegrations per minute per gram of carbon. The limit for reliable
1. 4 answers
2. asked by L.Bianchessi
3. 1,228 views
Express the following as a function of a single angle sin 20 degree cos 30 degree + cos 20 degree sin 30 degree
1. 1 answer
2. asked by Melinda
3. 1,226 views
Two boats start together and race across a 42 km wide lake and back. Boat A goes across at 42 km/h and returns at 42 km/h. Boat
1. 0 answers
2. asked by john
3. 1,211 views
The viscosity of a fluid is to be measured by a viscometer constructed of two 3-ft-long concentric cylinders. The inner diameter
1. 1 answer
2. asked by Angel
3. 1,209 views
how many significant figures does the sum of 8.520 the 2.7 contain?
1. 2 answers
2. asked by Anonymous
3. 1,203 views
3+siny = 3cos^2 y for 0<Y<360
1. 2 answers
2. asked by Amir
3. 1,198 views
The regular price is $20. The sale price is $20. What is the discount rate?
1. 3 answers
2. asked by Kevin
3. 1,186 views
Which of the following is a way to improve the efficiency of a heat engine?increase Qh reduce Qh reduce Wnet increase Qc A What
1. 0 answers
2. asked by Lena
3. 1,185 views
Solve the equation. (Enter solutions from smallest to largest. If there is no solution, enter NONE in the answer boxes.)5x2 = 9x
1. 1 answer
2. asked by Anonymous
3. 1,165 views
Suppose you are looking for a job. You interview with a company that has 10 general employees each make $100 per day, 7
1. 1 answer
2. asked by Anonymous
3. 1,157 views
A charge, Q2 = -9.00x10-6 C, is 12.00 cm to the right of charge Q1 = 10.00x10-6 C. Where can a third charge be placed, along the
1. 0 answers
2. asked by archi
3. 1,149 views
1. The Cossacks were a nomadic people whoa. led the Russian expansion overseas b. led the Russian expansion eastward towards
1. 2 answers
2. asked by mysterychicken
3. 1,141 views
1)3x^2-12x-21 solve by completing the square in simplest radical form2) (1/x+3)-(2/3-x)=(4/x^2-9)find values of x
1. 0 answers
2. asked by alice
3. 1,133 views
Do P waves travel faster through gas, liquids, or solids??I couldn't find the answer in my book OR the internet. Some smart
1. 2 answers
2. asked by Abbie
3. 1,130 views
Data collected on volcanic eruptions give a mean time between eruptions of 29 months. Assume these eruptions occur as a Poisson
1. 0 answers
2. asked by sand
3. 1,116 views
6. The idea that countries should produce and sell goods that they produce most effectivelyand efficiently, and buy goods that
1. 2 answers
2. asked by Heather
3. 1,104 views
Pick two similar small businesses in the same industry with which you are familiar, one successful and one not so successful.
1. 4 answers
2. asked by Demetria
3. 1,096 views
A 0.579 kg basketball is dropped out of a window that is 6.22 m above the ground. The ball is caught by a person whose hands are
1. 0 answers
2. asked by Jen
3. 1,092 views
A weak acid HA (pKa = 5.00) was titrated with 1.00 M KOH. The acid solution had a volume of 100.0 mL and a molarity of 0.100 M.
1. 1 answer
2. asked by Patrick
3. 1,074 views
3. An unknown element produces a spectral line of 425nm.A. Calculate the energy of the emitted photon in joules. B. What is the
1. 0 answers
2. asked by suszan
3. 1,065 views
Why is war against terrorists difficult to fight?C. Members of terrorist groups are scattered throughout the world, so there is
1. 1 answer
2. asked by tracy
3. 1,063 views
A six sided die is rolled three times. List possible outcomes and find the probability of rolling exactly one 6.
1. 3 answers
2. asked by juan777
3. 1,047 views
verify1-sintheta * costheta * tantheta = cos^2theta
1. 3 answers
2. asked by valeria
3. 1,044 views
if line BE bisects m<ABD and m<EBD equals 32 degrees find m<ABD
1. 2 answers
2. asked by yomamma
3. 1,042 views
What was the purpose of the First Continental Congress?????Please Help! PS: This is also a curious question.
1. 4 answers
2. asked by Laruen
3. 1,041 views
A person takes a trip, driving with a constant speed of 93.5 km/h except for a 22.0 min rest stop. If the person's average speed
1. 2 answers
2. asked by marybeth
3. 1,028 views
A truck on a straight road starts from rest and accelerates at 2.0 m/s2 until it reaches a speed of 20 m/s. Then the truck
1. 0 answers
2. asked by seanso
3. 1,026 views
Three point charges, A = 2.2 µC, B = 7.5 µC, and C = -3.9 µC, are located at the corners of an equilateral triangle . Find
1. 1 answer
2. asked by physics
3. 1,022 views
Use a spreadsheet to prepare a family of graphs for the titration of 50.0 mL of 0.020 M H2A with 0.100 M NaOH. Consider the
1. 1 answer
2. asked by Kevin
3. 1,020 views
7.How might this method of finding thickness of the aluminum be used in finding the size of the molecule?
1. 2 answers
2. asked by kylie
3. 1,001 views
It is desired to move a small, 50 kg cat in outer space by strapping a lamp, which emits 100 W of blue light to it. If the cat
1. 0 answers
2. asked by Anonymous
3. 997 views
A random sample is selected from a normal population with a mean of __40 and a standard deviation of __10. After a treatment is
1. 1 answer
2. asked by Sharon
3. 978 views
Assume a canister in a straight tube moves with a constant acceleration of -3 m/s2 and has a velocity of 13.5 m/s at t = 0.00 s.
1. 1 answer
2. asked by marybeth
3. 958 views
Two point charges are fixed on the y axis: a negative point charge q1 = -26 µC at y1 = +0.21 m and a positive point charge q2
1. 0 answers
2. asked by Anne
3. 953 views
A seismograph 300 km from the epicenter of an earthquake recorded a maximum amplitude of 5.2 102 µm. Find this earthquake's
1. 0 answers
2. asked by kiki
3. 953 views

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