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Questions Asked on September 19, 2010

175g of water was heated fro 15 to 88 degrees C. how many kilocalories were absorbed by the water?I got 94.5 kcal. Is this
1. 3 answers
2. asked by Jason
3. 10,609 views
An IRS auditor randomly selects 3 tax returns from 58 returns of which 8 contain errors. What is the probability that she
1. 4 answers
2. asked by Kerri
3. 9,932 views
A 0.25g sample of a pretzel is burned. The heat it gives of is used to heat 50.g of water from 18 to 42 degrees C. what is the
1. 2 answers
2. asked by Jason
3. 7,546 views
How do you calculate the PH of a buffer solution prepared by mixing 75 mL of 1.0 M lactic acid and 25 mL of 1.0 M sodium
1. 3 answers
2. asked by nicki
3. 5,901 views
A certain protein was found to have 0.855% zinc by mass. Determine the minimum molecular mass of the protein.How do I go about
1. 2 answers
2. asked by Katie
3. 5,572 views
When a chemical cold pack is activated, a chemical reaction occurs that causes the pack to feel cold.- Describe the transfer of
1. 5 answers
2. asked by Anonymous
3. 5,163 views
A box with no top is to be built by taking a 6'' - by - 10'' sheet of cardboard and cutting x - in. squares out of each corner
1. 1 answer
2. asked by Lala
3. 4,916 views
what type of reaction is thisLi + H2O --> LiOH A. Combination B. Combustion C. Decomposition Im thinking combination but the H2
1. 1 answer
2. asked by kellie
3. 4,290 views
Combustion analysis of an unknown compound containing only carbon and hydrogenproduced 2.277 g of CO2 and 1.161 g of H2O. What
1. 1 answer
2. asked by Laura
3. 4,124 views
How would you prepare 1L of a .050 M phosphate buffer at pH 7.5 using crystalline K2HPO4 and a solution of 1 M HCl? pka of H2PO4
1. 4 answers
2. asked by HELP!!!
3. 3,838 views
A child throws a ball with an initial speed of 8 m/s at an angle of 40 degrees above the horizontal. The ball leaves her hand 1
1. 3 answers
2. asked by Melissa
3. 3,838 views
You are shown a coin that its owner says is fair in the sense that it will produce the same number of heads and tails when
1. 3 answers
2. asked by Rhea
3. 3,711 views
A volume of 70.0mL of aqueous potassium hydroxide(KOH) was titrated against a standard solution of sulfuric acid (H2SO4). What
1. 3 answers
2. asked by Peter
3. 3,553 views
Explain why ethanol is not soluble in cyclohexane. Also, how do you figure out whether something is polar or nonpolar?
1. 3 answers
2. asked by Diana
3. 3,369 views
What is the length of FH if G is the midpoint, FG=12x-5, GH = 7x?
1. 4 answers
2. asked by Yonna
3. 2,990 views
Redox titrations are used to determine the amounts of oxidizing and reducing agents in solution. For example, a solution of
1. 1 answer
2. asked by Peter
3. 2,974 views
A train pulls away from a station with a constant acceleration of 0.44 m/s2. A passenger arrives at a point next to the track
1. 3 answers
2. asked by Chip
3. 2,934 views
If aluminum has a density of 2.7g/cm^3,what is the mass,in grams of the foil?It states that a package of aluminum foil is 54.3
1. 2 answers
2. asked by TT
3. 2,831 views
A 4kg object is subjected to two forces, F1=2Ni-3Nj, and F2=4Ni-11Nj. The object is at rest at the origin at t=0.What is the
1. 4 answers
2. asked by J
3. 2,707 views
Translate the following sentence into a mathematical equation:"The area, A, of a circle is the product of the number pi and the
1. 3 answers
2. asked by Hannah
3. 2,478 views
Hi, I have to answer if each questions is a nominal, ordinal, interval discrete, interval continuous, ratio discrete, or ratio
1. 1 answer
2. asked by Paul
3. 2,438 views
A class consist of 2/5 freshman,1/4 sophomores, and 1/10 juniors; the rest are seniors. What fraction of class are seniors?
1. 3 answers
2. asked by Anonymous
3. 2,417 views
Block A of mass 4.0 kg is on a horizontal, frictionless tabletop and is placed against a spring of negligible massand spring
1. 1 answer
2. asked by Joe
3. 2,318 views
An open box is to be made from a square piece of cardboard, 32 inches on a side, by cutting equal squares with sides of length x
1. 2 answers
2. asked by BJ
3. 2,317 views
Convert each of the following repeating decimals to a/b form, where a, b are integers and b ≠ 0.#2a ¯ 0.4 #2c ¯ 1.396 #2e ¯
1. 3 answers
2. asked by Anonymous
3. 2,278 views
A charged line extends from y = 2.50 cm to y = -2.50 cm. The total charge distributed uniformly along the line is -9.00 nC. Find
1. 1 answer
2. asked by stacy
3. 2,230 views
Suppose you believe that, in general,graduates who have majored in your subject are offered higher salaries upon graduating than
1. 2 answers
2. asked by Rhea
3. 2,214 views
How many calories are required at 0 degrees C to melt an ice cube with a mass of 25g?I got 2000 cal. Could you tell me if this
1. 3 answers
2. asked by Eric
3. 2,143 views
You measure the radius of a wheel to be 4.16 cm. If you multiply by 2 to get the diameter, should you write the result as 8 cm
1. 1 answer
2. asked by carlos
3. 2,077 views
total normal stresses of 110 and 40 kpa are applied to two planes at right angles in an element of soil. the shear stress acting
1. 3 answers
2. asked by nick
3. 2,062 views
Questions1. Research conducted by Luthans supports the belief that promotions are base on performance. True or false 2. Tenure
1. 8 answers
2. asked by Edith
3. 1,950 views
Calculate the amount of water (in grams) that must be added to (a)5.00 g of urea (NH2)2CO in the preparation of a 16.2 percent
1. 1 answer
2. asked by Diana
3. 1,947 views
A person looking out the window of a stationary train notices that raindrops are falling vertically down at a speed of 4.15 m/s
1. 1 answer
2. asked by ba
3. 1,855 views
Given a cell based on the spontaneous reaction2AgCl(s) + Zn(s) ® 2Ag(s) + 2Cl– + Zn2+ If the zinc ion concentration is kept
1. 3 answers
2. asked by lucylu
3. 1,713 views
A car is being pulled out of the mud by two forces that are applied by the two ropes shown in the drawing. The dashed line in
1. 1 answer
2. asked by Amy
3. 1,688 views
Block A of mass 4.0 kg is on a horizontal, frictionless tabletop and is placed against a spring of negligible massand spring
1. 1 answer
2. asked by Joe
3. 1,678 views
DDT, an insecticide harmful to fish, birds, and humans, is produced by the following reaction:2 C 6 H 5 Cl (Chlorobenzene) + C 2
1. 1 answer
2. asked by Jack
3. 1,663 views
i am a number in the fourth row on the hundred chart. my ones digit is twice my tens digit. what number am i;
1. 3 answers
2. asked by elena
3. 1,628 views
Combustion analysis of 0.300 g of an unknown compound containing carbon, hydrogen, and oxygen produced 0.5213 g of CO2 and
1. 2 answers
2. asked by Selena
3. 1,593 views
Richard is driving home to visit his parents125 mi of the trip are on the interstate highway where the speed limit is 65 mph
1. 2 answers
2. asked by melissa
3. 1,578 views
Traumatic brain injury such as concussion results when the head undergoes a very large acceleration. Generally, an acceleration
1. 1 answer
2. asked by greg
3. 1,535 views
There are 18 students standing in a circle, evenly spaced and consecutively numbered. Which student is directly opposite student
1. 4 answers
2. asked by Hannah
3. 1,451 views
A sugar crystal contains approximately 1.7×10^17 sucrose (C12H22O11) moleculesWhat is its mass in mg?
1. 3 answers
2. asked by Mely
3. 1,451 views
Calculate the mass in g of each of the following.a. 2.3×10^22 H2O molecules b. 6.16×10^20 SO3 molecules c. 5.0×1025 O3
1. 1 answer
2. asked by Mely
3. 1,387 views
2C2H6(g) + 7O2(g) > 4CO2(g) + 6H2O(g)KCl(s) > K(s) + Cl2(g) is this balanced?
1. 1 answer
2. asked by kellie
3. 1,343 views
A car starts from rest and travels for 5.0 seconds with a uniform acceleration of +1.5 m/s^2. The driver then applies the
1. 2 answers
2. asked by caitlin
3. 1,312 views
12. Four research participants take a test of manual dexterity (high scores mean better dexterity)and an anxiety test (high
1. 2 answers
2. asked by Elizabeth
3. 1,303 views
An object made of aluminum has a mass of 8.37g. When it was placed in a graduated cylinder containing 20.0mL, the water level
1. 2 answers
2. asked by Eric
3. 1,300 views
Our professor wants us to evaluate the limits analytically without using a table or a graph, and if it doesn't exist we must
1. 9 answers
2. asked by Anna
3. 1,289 views
A CD has to rotate under the readout-laser with a constant linear velocity of 1.25 m/s. If the laser is at a position 3.2 cm
1. 1 answer
2. asked by Kelly
3. 1,281 views
1. Decide on the type of tool or instrument you think would be effective given your topic on if there is no relationship between
1. 1 answer
2. asked by Stacey
3. 1,255 views
Write each of the following square roots in the form a√b, where a and b are integers, b > 0, and b has the least value
1. 1 answer
2. asked by Anonymous
3. 1,227 views
What weather would it be when:A. a cold front is moving into an area that has warm, moist air. B. A warm front is moving into an
1. 1 answer
2. asked by Leah
3. 1,225 views
In trial one the mass of silver oxide is .5g. The mass of silver metal product is .431 grams.In trial two the silver oxide=.498
1. 1 answer
2. asked by mike
3. 1,207 views
Three Coulombs of charge flow through a wire in 150 ms.If the current ceases to flow (goes to zero Amps) for the following 850
1. 1 answer
2. asked by Robby
3. 1,197 views
The exterior angles of a triangle measure x°, (2x)°, and (3x)°. What is the value of x?
1. 1 answer
2. asked by Chase
3. 1,194 views
A person in a stationary, non-moving elevator drops a coin and it reaches the floor 0.6 seconds later. Now he repeats the
1. 1 answer
2. asked by Rose Victory
3. 1,182 views
Assuming biological substances are 90% water and the density of water is 100 kg/meter cubed, estimate the mass of a fly, which
1. 2 answers
2. asked by Mariah
3. 1,163 views
A Norman window has the shape of a rectangle surmounted by a semicircle as in the figure below. If the perimeter of the window
1. 2 answers
2. asked by B
3. 1,152 views
I'm learning about Asian music and i have 7 terms, and i have to group them into either folk, classical or popular. The 7 terms
1. 2 answers
2. asked by Jake
3. 1,123 views
When brought to the surface of the moon, will a mass have more or less weight than it did on the surrface of the earth, or will
1. 4 answers
2. asked by Anonymous
3. 1,110 views
a grizzly bear makes a displacement of 1563 m due west, followed by a displacenent of 3348 m in a direction 32.0 north of west.
1. 2 answers
2. asked by Anonymous
3. 1,098 views
In each of the following, order the decimals from greatest to least:a) 13.4919, 13.492, 13.49183, 13.49199 b) -1.453, -1.45,
1. 3 answers
2. asked by Anonymous
3. 1,097 views
how to find the xintercept and y intercept5y=15x-90
1. 2 answers
2. asked by karl
3. 1,093 views
A large university campus has 60,000 students. The president of the students' association wants to conduct a survey of the
1. 1 answer
2. asked by Rhea
3. 1,092 views
f(x)=kx^2+3a) if the tangent lines to the graph of f at (t,f(t)) and (-t, f(-t)) are perpendicular, find t in terms of k b) Find
1. 1 answer
2. asked by Rachel
3. 1,089 views
A regular feature in a newspaper asks readers to respond via e-mail to a survey that requires a yes or no response. In the
1. 2 answers
2. asked by Rhea
3. 1,083 views
Two objects attract each other gravitationally with a force of 3.5 10-10 N when they are 0.33 m apart. Their total mass is 4.0
1. 1 answer
2. asked by ami
3. 1,081 views
To determine the sodium carbonate content & total alkali in NaOH, the following steps were performed:-1) 2.0g of NaOH was
1. 2 answers
2. asked by anne
3. 1,051 views
Choose three (3) works of art from three artists from the Baroque period through the Postmodern era. Your three (3) works of art
1. 1 answer
2. asked by Anonymous
3. 1,016 views
Convert each of the following repeating decimals to a/b form, where a, b are integers and b ≠ 0.#2a ¯ 0.4 #2c ¯ 1.396 #2e ¯
1. 1 answer
2. asked by Anonymous
3. 1,001 views
The speed of sound in air is about 330m/sec. If a lighting flash occurs 5.5 seconds before you hear the thunder how far away
1. 3 answers
2. asked by Rose Victory
3. 996 views
the line with the equation x+y=3 is graphed on the same xy-plane as the parabola with vertex (0,0) and focus (0,3). What is the
1. 1 answer
2. asked by edith
3. 991 views
Questions1. Research conducted by Luthans supports the belief that promotions are base on performance. True or false 2. Tenure
1. 2 answers
2. asked by Edith
3. 983 views
Ports A and B are 400 miles apart. One boat starts from port A for port B at 6:05 and travels with a constant speed of 12 mph.
1. 1 answer
2. asked by JD Smith
3. 982 views
A current of a river flows steadily from west to east at 1.00 m/s. A boat in the river travels at 3.00 m/s relative to the
1. 1 answer
2. asked by .
3. 975 views
14. Evolutionary theories often emphasize that humans have adapted to their physicalenvironment. One such theory hypothesizes
1. 1 answer
2. asked by rick
3. 967 views
i need someones opinion on this question please. The American criminal justice system is a good one, but far from perfect.
1. 1 answer
2. asked by paula
3. 949 views
What is the conjugate base of the following substances:a. (CH3)3NH /(CH3)3N b. H3N-CH2-COOH / H3N-CH2-COO c. H3N-CH2-COO /
1. 1 answer
2. asked by help
3. 949 views
Explain an error problem in each of the following:a) 13/35=1/5, 27/73 = 2/3, 16/64 = 1/4 b) 4/5+2/3=6/8, 2/5+3/4=5/9,
1. 2 answers
2. asked by Anonymous
3. 935 views
a student throws a ball straight upwards to a height to height of 7.50m How much work did did the student do?
1. 1 answer
2. asked by tony
3. 931 views
Need two peer reviewed articles to help me work on those questions. belowDiscuss how social psychology differs from other
1. 3 answers
2. asked by rose
3. 920 views
The operations manager of a large plant with four departments wants to estimate the person-hours lost per month due to
1. 2 answers
2. asked by Rhea
3. 920 views
Solve. write the solution set using interval notation9-(7x-9)is greater than or equal to sign -8(x+1)-8
1. 2 answers
2. asked by Anonymous
3. 902 views
If aluminum has a density of 2.7g/cm3,what is the mass,in grams of the foil?
1. 3 answers
2. asked by TT
3. 897 views
What is the RESOLVING POWER of a electron and light microscope?
1. 0 answers
2. asked by Chris
3. 890 views
Why is it important to discuss the author of a book and the background of the author to students?
1. 1 answer
2. asked by Madeline
3. 888 views
a girl on a motorbike passes by at a speed of 15 m/sec.her mass is 40 kg. what is the kinetic energy
1. 1 answer
2. asked by sergio
3. 865 views
what normal annual interst rate has an effective annual yield of 7.8% under continuous compounding?
1. 2 answers
2. asked by annonymous
3. 855 views
A red train traveling at 72 km/h and a green train traveling at 144 km/h are headed toward each other along a straight, level
1. 0 answers
2. asked by Anonymous
3. 848 views
An inquisitive physics student, wishing to combine pleasure with scientific inquiry, rides on a rollercoaster sitting on a
1. 1 answer
2. asked by Manny
3. 847 views
Use the concepts of effective nuclear charge, shielding, and n value of the valence orbital to explain the trend in atomic
1. 1 answer
2. asked by jojo
3. 840 views
After more than 10 years of proposals, revisions, and re-revisions, the National Conference of Commissioners on Uniform State
1. 2 answers
2. asked by CYNTHIA
3. 836 views
Two cars travel at the same constant speed. The first car travels for 10 minutes, the second for 27 minutes. If the second car
1. 2 answers
2. asked by Rose
3. 833 views
ER Medical Supplies had sales of 2,000 units at $160 per unit last year. The marketing manager projects a 25 percent increase in
1. 0 answers
2. asked by Joceline
3. 805 views
I forgot to include the following sentences when describing the school day. As I couldn't send you my previous post, I typed
1. 1 answer
2. asked by Franco
3. 803 views
Can you check these. I'm not really sure how to do these so I need a little help and examples.Part 1: Des promoms interrogatifs
1. 1 answer
2. asked by Missy
3. 786 views
How would I approach this problem? What formula would I use to answer each part? Thank you in advance for any guidance...As part
1. 1 answer
2. asked by .
3. 778 views
32 kg box sitting on a ramp has a coefficent of 0.21. If the ramp is raised, at what angle will the box begin slipping?
1. 0 answers
2. asked by Angela
3. 773 views
Here's a physics problem. I don't care about the answer, i just want to know how to do it. don't have to be too detailed.. but i
1. 2 answers
2. asked by jo
3. 773 views

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