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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. 14,357 views
What is the pH of a 2.8 M solution of HClO4?
1. 5 answers
2. asked by katie
3. 9,492 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. 6,773 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. 5,942 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. 5,056 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. 4,247 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. 4,143 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. 4,131 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. 4,044 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. 4,023 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. 3,799 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. 3,744 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. 3,712 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. 3,679 views
What was the Declaration of Independence and why was it written?
1. 12 answers
2. asked by Laruen
3. 3,554 views
Find the formula for the compound that contains 72.4% iron and 27.6% oxygen.
1. 2 answers
2. asked by student
3. 3,439 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. 3,280 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. 3,208 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. 2,812 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. 2,762 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. 2,754 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. 2,504 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. 2,477 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. 2,439 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. 2,379 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. 2,347 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. 2,278 views
prove that sinA/(1+cosA) + (1+cosA)/(sinA) = 2cosecA
1. 1 answer
2. asked by Amir
3. 2,265 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. 2,248 views
If BE bisects measure ABD and measure EBD equals 32 find measure ABD
1. 4 answers
2. asked by Anonymous
3. 2,224 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. 2,212 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. 2,023 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. 1,942 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. 1,940 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. 1,928 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. 1,927 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. 1,923 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. 1,899 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. 1,865 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. 1,861 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. 1,822 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. 1,759 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. 1,686 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. 1,585 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. 1,578 views
how many different ways can eight cars finish in a race 1st, 2nd, 3rd ?
1. 4 answers
2. asked by theresa
3. 1,530 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. 1,485 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. 1,437 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. 1,391 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. 1,385 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. 1,372 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. 1,350 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. 1,334 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. 1,329 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. 1,324 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. 1,296 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. 1,293 views
Name some of the people who helped winthe Revolution and list their contributions.
1. 3 answers
2. asked by stephanie
3. 1,284 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. 1,276 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. 1,276 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. 1,272 views
calculate[OH-],[H+] of a .20 M solution of triethylamine Kb=4.0*10^-4
1. 1 answer
2. asked by chad
3. 1,267 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. 1,258 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. 1,238 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. 1,209 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. 1,202 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. 1,195 views
how many significant figures does the sum of 8.520 the 2.7 contain?
1. 2 answers
2. asked by Anonymous
3. 1,188 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. 1,184 views
3+siny = 3cos^2 y for 0<Y<360
1. 2 answers
2. asked by Amir
3. 1,178 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. 1,164 views
The regular price is $20. The sale price is $20. What is the discount rate?
1. 3 answers
2. asked by Kevin
3. 1,162 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. 1,153 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. 1,136 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. 1,130 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. 1,119 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. 1,112 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. 1,107 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. 1,101 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. 1,072 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. 1,071 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. 1,065 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. 1,058 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. 1,040 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. 1,038 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. 1,037 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. 1,021 views
if line BE bisects m<ABD and m<EBD equals 32 degrees find m<ABD
1. 2 answers
2. asked by yomamma
3. 1,018 views
verify1-sintheta * costheta * tantheta = cos^2theta
1. 3 answers
2. asked by valeria
3. 1,018 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. 1,005 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. 1,001 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. 993 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. 992 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. 992 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. 977 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. 975 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. 947 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. 938 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. 931 views
Can someone please explain the exotic becomes erotic theory by daryl bem, i have read it but i cant understand what its really
1. 1 answer
2. asked by Jess
3. 924 views

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