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Lance
Questions and answers by visitors named
Lance
Questions (180)
Calculate the calorimeter constant if 25g of water at 50C was added to 25g of water at 25C with a resulting temperature of 35C?
T
4 answers
1,441 views
An object is placed at a distance of 60 cm from a converging lens with a focal length of 20cm. What is the magnification of the
5 answers
3,487 views
A sample of ethanol, C2H5OH, weighing 2.84 g was burned in an excess of oxygen in a bomb calorimeter. The temperature of the
4 answers
4,468 views
When a second post is made to a question, the most recent is now at the bottom. Do any of you prefer the way it was, or do you
2 answers
1,351 views
According to Webster's not much. I'd say they were synonyms.
Shoal: a large group or number : CROWD <a shoal of fish> School: a
1 answer
658 views
catalyst: a substance that changes the speed of a chemical reaction without affecting the yield or undergoing permanent chemical
3 answers
1,373 views
By movement I'm guessing you mean dispersal? Otherwise fungi don't move much.
Try here:
2 answers
603 views
http://classweb.gmu.edu/biologyresources/writingguide/ScientificPaper.htm
What are the steps of the scientific method? I think
3 answers
989 views
http://en.wikipedia.org/wiki/Protostar
http://www.google.com/search?as_q=&num=10&hl=en&btnG=Google+Search&as_epq=stellar+evolutio
1 answer
481 views
What characterizes the electron configurations of transition metals such as silver and iron?
Thanks Alot in Advance.. Fe is in
1 answer
1,208 views
Please don't do that again or you will be banned from this forum.Your question is pretty vague. What observation table are you
1 answer
683 views
Give us the figures.
Density is equal to mass over volume. D= M --- V To get mass you weigh the object. To get volume you either
1 answer
591 views
http://en.wikipedia.org/wiki/Melting_point
Question: A solid substance has a vapor pressure of 100 mmHg at the melting point
1 answer
1,014 views
Below is the original question and emailed response from my friend, Dr Ford, a theoretical physicist at Tufts University in
1 answer
1,035 views
There is a lot on this at:
http://fig.cox.miami.edu/~cmallery/150/life/top_10_life.htm Make sure and go all the way to the bottom
1 answer
482 views
http://www.nd.edu/~rbarger/www7/
http://historyeducationinfo.com/
1 answer
349 views
Where can i find drawing of electron dot stuctures for compounds like BR2 and HCN
HCN is at the link below.
1 answer
697 views
http://en.wikipedia.org/wiki/Alternation_of_generations
why does life cycle of moss involve alternation of generation?
1 answer
458 views
Look at the picture on the immediate left here:
http://en.wikipedia.org/wiki/Earth's_magnetic_field Also:
2 answers
504 views
non-volatile means a liquid that won't evaporate at all. It's not a commomly encountered term because there is usually some
1 answer
577 views
http://momo.essortment.com/versaillestrea_reif.htm
http://en.wikipedia.org/wiki/Treaty_of_Versailles
1 answer
563 views
http://en.wikipedia.org/wiki/Arctic_Circle
what is the artic circle? what is the line of cancer and capricorn?
1 answer
450 views
We don't just answer questions here. We help. So at least tell us your best thought out answer and why you chose it. Then we'll
3 answers
1,477 views
http://www.google.com/search?as_q=volcanoes+&hl=en&num=10&btnG=Google+Search&as_epq=ring+of+fire&as_oq=&as_eq=&lr=&as_ft=i&as_fi
1 answer
661 views
http://en.wikipedia.org/wiki/Cyanobacteria
Scroll to photosynthesis and read. Then think about how most plants and algae use
1 answer
461 views
The word step is misleading.
http://biology.about.com/library/bltranslation.htm How many steps are there in translation? I've
1 answer
591 views
CAN SOMEONE FIND ME A TIME LINE ABOUT AVI? (Avi is a famous writer)
THANk YOU!! HAPPY SB07 You should be able to construct a
1 answer
472 views
http://en.wikipedia.org/wiki/African_American#Total_African_American_population
how many african americans live today.
6 answers
460 views
http://images.google.com/images?as_q=&hl=en&gbv=2&output=images&svnum=10&btnG=Google+Search&as_epq=homogeneous+mixture&as_oq=&as
1 answer
872 views
Adding Doubles just means adding the same numberr to itself. Like 2+2=4, 3+3=6, So addind doubles to 18 would be 0+0=0, 1+1=2,
4 answers
460 views
What was the function of the egyptian funerary complex?
1 answer
385 views
To stop a car, first you require a certain reaction time to begin braking. Then the car slows down at a constant rate. Suppose
3 answers
584 views
Assume Williams inc has:
Debt ratio= 40% Net profit margin= 10% Return on assets = 25% Find williams Total Asste Turnover Ratio
1 answer
410 views
A firm has ROA of 14% and a debt/equity ratio of 0.8. The ffirms ROE is?
1 answer
848 views
x + 2y = 4 and x - 4y = 8, solve for x
1 answer
416 views
Solve for x.
10000 = 2500(1.0425)^3 + X(1.0425)^2 + 3500(1.0425)^1
1 answer
433 views
solve for x
10000 = 2500(1.0425)^3 + X(1.0425)^2 + 3500(1.0425)^
1 answer
314 views
How much cash must be deposited in a savings account In Order To Accumulate 50,000 At End Of 7 Years With 12 % Interest Rate?
3 answers
423 views
another name and cause of hyperthyroidism
1 answer
324 views
A banked circular highway curve is designed for traffic moving at 60 km/h. The radius of the curve is 207 m. Traffic is moving
1 answer
671 views
A 26 loudspeaker is suspended 3.0 below the ceiling by two cables that are each 40 from vertical.
What is the tension in the
2 answers
614 views
Please help with solving this
5r(6rs-12st)t
2 answers
1,057 views
you have16 coins that are heads up an18 coins that are tails up. After you add some coins that are tails up, the ratio of heads
1 answer
413 views
Any object, be it a space satellite or a molecule, must attain an initial upward velocity of at least 11.2 km/s in order to
3 answers
554 views
Nitrous oxide, N2O, has been used as a dental anesthetic. Suppose that the average speed of an N2O molecule at 25°C is 377 m/s.
2 answers
1,222 views
Hydrogen is burned in oxygen to release heat. How many grams of hydrogen gas must be burned to release enough heat to warm a
2 answers
1,126 views
A 19.5-g sample of a metal was heated to 61.67°C. When the metal was placed into 27.1 g of water in a calorimeter, the
1 answer
493 views
How much heat is released when a mixture containing 12.6 g CS2 and 13.2 g Cl2 reacts by the following equation?
CS2(g) + 3 Cl2(g)
2 answers
573 views
When ice at 0°C melts to liquid water at 0°C, it absorbs 0.334 kJ of heat per gram. Suppose the heat needed to melt 30.7 g of
3 answers
1,658 views
Suppose you mix 20.1 g of water at 66.2°C with 45.1 g of water at 35.7°C in an insulated cup. What is the maximum temperature
3 answers
389 views
Propane, C3H8, is a common fuel gas. Use the following to calculate the grams of propane you would need to provide 383 kJ of
4 answers
4,795 views
(a) A 102-g sample of water is placed in an insulated container and allowed to come to room temperature at 21°C. To heat the
2 answers
892 views
The specific heat of copper metal was determined by putting a piece of the metal weighing 39.4 g in hot water. The quantity of
3 answers
579 views
Any object, be it a space satellite or a molecule, must attain an initial upward velocity of at least 11.2 km/s in order to
1 answer
440 views
What is the wavelength of the electromagnetic radiation emitted from a hydrogen atom when the electron undergoes the transition
4 answers
1,352 views
At what speed must an electron travel to have a wavelength of 13.6 pm? I got 9.89x10^-15 as the answer and its wrong where did I
1 answer
441 views
What is the energy of a photon corresponding to radio waves of frequency 1.475 106 /s? I got 9.77e-28 as an answer and its wrong
3 answers
578 views
At what speed must a neutron travel to have a wavelength of 9.2 pm?
7 answers
593 views
At what speed must an electron travel to have a wavelength of 13.6 pm? I got 9.89x10^-15 m/s as the answer and its wrong where
1 answer
364 views
A sample of cesium metal reacted completely with water, evolving 48.7 mL of dry H2 at 24°C and 774 mmHg. What is the equation
2 answers
573 views
A particular microwave oven delivers 800 watts. (A watt is a unit of power, which is the joules of energy delivered, or used,
4 answers
1,223 views
The term degeneracy means the number of different quantum states of an atom or molecule having the same energy. For example, the
3 answers
431 views
A neutral molecule is identified as a tetrafluoride, XF4, where X is an unknown atom. If the molecule has a dipole moment of
4 answers
1,553 views
(a) A sample of cesium metal reacted completely with water, evolving 48.7 mL of dry H2 at 24°C and 774 mmHg. What is the
3 answers
560 views
For each of the following pairs of elements, state whether the binary compound formed is likely to be ionic or covalent. Give
4 answers
1,817 views
Assume the heat absorbed by the calorimeter was 200J. What is the calorimeter constant (Heat Capacity) if the temperature
5 answers
1,614 views
Assume a piece of hot metal is added to a calorimeter containing 50mL of water at 22C. The amount of heat released by the metal
3 answers
2,006 views
Assume a piece of hot metal is added to a calorimeter containing 50mL of water at 22C. The amount of heat released by the metal
5 answers
1,073 views
Calculate the molar heat of neutralization in kj/mol of the reaction between HA and BOH given the following information:
The
4 answers
2,312 views
2. Segment RT is the midsegment of the trapezoid. Find x.
1 answer
472 views
Carbon tetrachloride CCl4 contains carbon (EN = 2.5) and chloride (EN = 3.0). Because of this, CCl4 is:
2 answers
500 views
Boiling occurs when?
1 answer
283 views
The largest island in the world, locates near Canda is called______.
I think it's Greenland
4 answers
1,000 views
A bag contains 5 slips of paper. On each slip is written the name of a member of the Avila family--Mr.Avila,Mrs.Avila,their
1 answer
405 views
A bag contains 5 slips of paper. On each slip is written the name of a member of the Avila family--Mr.Avila,Mrs.Avila,their
1 answer
429 views
In what city did Rosa Parks defy the rules of segregation?
2 answers
1,060 views
A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 8.15 m/s at an angle of
2 answers
686 views
We have to find 20 collective nouns in a magazine. So far are all of these collective?
1.partners 2.Birds 3.Family 4.Amphibians
10 answers
528 views
All Collective nouns?
festival family flock crowd parties army village company gallery
3 answers
349 views
A mixture of the compounds sodium oxide and magnesium chloride contains 2.4182 g of sodium oxide and is 89.3 % by mass magnesium
3 answers
464 views
A mixture of the compounds magnesium oxide and calcium sulfide contains 21.6999 g of magnesium oxide and is 51.3 % by mass
2 answers
589 views
The triation of 50.00 mL of 0.025 00 M MES with 0.100 0 M NaOH. MES is a weak acid with pKa=6.27. Compute Ve, first. Show what
2 answers
1,177 views
Based on the balanced equation
4Na + O2 → 2Na2O calculate the number of Na2O formula units formed when 60 Na atoms and 10 O2
1 answer
595 views
Based on the balanced equation
4Na + O2 → 2Na2O calculate the number of Na2O formula units formed when 60 Na atoms and 10 O2
1 answer
435 views
Based on the balanced equation
4Na + O2 → 2Na2O calculate the number of Na2O formula units formed when 60 Na atoms and 10 O2
3 answers
1,138 views
A study on the amount of dye needed to get the best color for a certain type of fabric was conducted. The following data give
1 answer
428 views
A 79.1 g mixture of the compounds calcium chloride and sodium sulfide is 80.9 % by mass sodium sulfide. The compound sodium
2 answers
976 views
Need help balancing chemical equation. Complete and balance the chemical equation. Be sure to include the states of the
4 answers
607 views
A gas containing carbon and hydrogen analyzed as 85.6 % carbon and 14.4 % hydrogen. A 42.1 g sample of a gas occupied a volume
3 answers
1,058 views
Write a story for the following multiplication problem : 16x5
Derrick gets $5 for every hour he works at the store. He works for
2 answers
514 views
What does TRAC stand for
1 answer
321 views
2.36 rounded to the tenths place
3 answers
343 views
Round each number to the nearest whole number
3/14
4 answers
449 views
Maria served 4 1/7 loaves of banana bread and 4 2/3 loaves of cranberry bread. About how many slices of bread did she serve
A.80
6 answers
708 views
Elana bought three bags of dried fruit that weighed 1 7/10 3 1/4 and 2 3/5 about how many fruit did she buy
6 7 10 8 6?
7 answers
545 views
School is out at 3:50 pm. Band practice is 2 1/2 hrs dinner takes 3/4 of an hour homework takes 1 1/4 hrs. You have to go to bed
4 answers
928 views
Jared and 5 friends wanted to make mac and cheese for lunch. they decided to use 3 boxes and each box needs 1` 2/3 cups of milk.
2 answers
487 views
what is 1 2/3 times 3
1 answer
206 views
Use estimation to determine which expression has the least value
A. 5 3/4 + 2 1/4 - 2 1/8= 8? B. 6 1/4 + 1 - 1 1/4= 6? C.8 1/3 -
1 answer
325 views
What is the greatest common factors of 9 and 27
A.3 B.6 C.9 D.18 C?
4 answers
757 views
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