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Lauren

Questions and answers by visitors named Lauren

Questions (1,093)

Is the sequence geometric? If so identify the common ratio.1.A 2.C 3.B 4.A 5.B 6.D
1. 7 answers
2. asked by Lauren
3. 5,204 views
1.What is a reasonable estimate for the area of a circle with radius 4 cm?A. Area=12cm^2 B. Area=16cm^2 C. Area=24cm^2 D.
1. 7 answers
2. 2,135 views
The hypotenuse of a right triangle is 29.0 centimeters. The length of one of its legs is 20.0 centimeters. What is the length of
1. 4 answers
2. 2,310 views
Electrons are accelerated to reach a kinetic energy of 250 eV (= 4.0 x 10-17 J). If the acceleration is done in a distance of
1. 4 answers
2. 1,100 views
A commuting student leaves home and drives to school at an average speed of 42.0 km/h. After 20.0 min he realizes that he has
1. 4 answers
2. 1,772 views
Unpolarized light passes through six successive Polaroid sheets each of whose axis makes a 59 degree angle with the previous
1. 5 answers
2. 3,806 views
Concentrated aqueous ammonia contains 1.00 mol NH3 dissolved in 2.44 mol H20. What is the mole fraction of NH3 in concentrated
1. 5 answers
2. 2,522 views
An electron enters a parallel plate apparatus 10.0cm long and 2.0cm wide, moving horizontallyat 8.0 × 10^7 m/s. (top plate is
1. 4 answers
2. 2,694 views
a diver exhales a bubble with a volume of 250 mL at a pressure of 2.4 atm and a temperature of 15 degrees celcius. What is the
1. 6 answers
2. 13,371 views
A racing car starting from a standstill can reach a speed of 320 km/h in 6.50 s by exerting an average horizontal force of 1.52
1. 4 answers
2. 718 views
A cone-shaped pile of sawdust has a base diameter of 40 feet, and is 15 feet tall.Find the volume of the sawdust pile. Round
1. 5 answers
2. 5,472 views
What is the purpose of the NAFTA treaty?
1. 16 answers
2. 5,293 views
When 5.49 g of platinum reacts with an excess of fluorine, 7.65 g of platinum(_) fluoride forms.a. What is the mass of fluorine
1. 4 answers
2. 2,094 views
What is the molar change in enthalpy when 100g of ice is heated from -72°C to -18.2°C?(cp=37.4 J/k•mol)Would the answer be
1. 4 answers
2. 1,154 views
What evidence suggests that Roman society was more stable during the time of republic than it had been during the time of the
1. 1 answer
2. 1,215 views
A rock is dropped from a height of 100m.a) how long does it take to fall the first 50m? b)How long does it take to fall the last
1. 3 answers
2. 1,599 views
A train track is 5280ft. long. After adding another foot of track, an arc is created. What is the height of the arc and how
1. 1 answer
2. 502 views
What problems did the Israelites face when they returned to Canaan?This is a religious, rather than a historic question. Please
1. 1 answer
2. 671 views
How do you cite a website in a paper? I know it is in parentheses, but that is pretty much all I know.citing websites (Broken
1. 1 answer
2. 609 views
Lynch, T. (1996). DS9 trials and tribble-ations review. RetrievedOctober 8, 1997, from Psi Phi: Bradley's Science Fiction Club
1. 1 answer
2. 666 views
Write the equation of the line that passes through the points (1,6) and (-1,-2)please help!!!!
1. 1 answer
2. 348 views
We know that the negative charge on the electron and the positive charge on the proton are equal. Suppose, however, that these
1. 2 answers
2. 785 views
Does it matter if the Federal government or the state governments get to decide if the Federal government exceeded its
1. 1 answer
2. 393 views
Can any one help me for this problem?The cube in Figure 23-27 has edge length 1.40 m and is oriented as shown in a region of
1. 2 answers
2. 952 views
I know that inhalants aren't either a stimulant or a depressant. So what are they?Thank you for using the Jiskha Homework Help
1. 1 answer
2. 482 views
Help! An inhalant is not a stimulant or a depressant. So... what is it then?????? Puh-leaze help me! My grade this term counts
1. 1 answer
2. 595 views
HW - Name an example of the 6 simple machines that are in your home.So I have to write an example each or write an example that
1. 4 answers
2. 669 views
I roll 12 4-sided dice. What is the probability that I roll at least one 2? What is the probability that I roll exactly three
1. 1 answer
2. 740 views
I roll twelve 4-sided dice. What is the probability that I roll at least one 2? What is the probability that I roll exactly
1. 1 answer
2. 454 views
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1. 1 answer
2. 209 views
On what two ground have Presidents base their power of Executive privilege ?http://en.wikipedia.org/wiki/Executive_privilege =)
1. 1 answer
2. 464 views
Suppose you are in charge of planning a forest reserve, and one of your main goals is to help sustain locally beleaguered
1. 1 answer
2. 385 views
Suppose you are in charge of planning a forest reserve, and one of your main goals is to help sustain locally beleaguered
1. 5 answers
2. 2,296 views
write equation in standard form.E(-3,-6) and F(-5,-7)
1. 3 answers
2. 303 views
What year was the first bike invented in? I can't find that information anywhere.
1. 7 answers
2. 454 views
I need one example of a class one lever that is nothing like scissors (eg. pliers, wire cutters...) and has nothing to do with
1. 3 answers
2. 313 views
Determine the nature of the roots of this question (1/4)x^2+x+1=0
1. 1 answer
2. 314 views
Determine the nature of the roots of this question (1/4)x^2+x+1=0
1. 1 answer
2. 300 views
If 456 dm^3 of krypton at 101 kPa and 21 degrees C is compressed into a 27.0 dm^3 tank at the same temperature, what is the
1. 4 answers
2. 2,549 views
A mole of gas at 0 degrees C and 760 mmHg occupies 22.41 L. What is the at 20 degrees C and 760 mmHg?T1= 273 K T2= 293 K V1=
1. 2 answers
2. 689 views
An experiment called for 4.83 L of sulfur dioxide at 0 degrees C and 1.00 atm. What would be the volume of this gas at 25
1. 4 answers
2. 2,776 views
A driving bell is a container open at the bottom. As the bell descends, the water level inside changes so that the pressure
1. 5 answers
2. 851 views
In an experiment, you fill a heavy walled 5.00 L flask with methane gas, CH4. If the flask contains 7.13g of methane at 19
1. 5 answers
2. 3,231 views
According to your calculations a reaction should yield 5.67 g of oxygen O2. What do you expect the volume to be at 23 degrees C
1. 4 answers
2. 2,487 views
A 2.50 L flask was used to collect a 5.65 g sample of propane gas, C3H8. After the sample was collected, the gas pressure was
1. 5 answers
2. 3,841 views
Nitric Acid is produced from nitric oxide, NO which in turn is prepared from ammonia by the ostwald process.4NH3 + 5O2 ----->
1. 4 answers
2. 2,165 views
Magnesium metal reacts with hydrochloric acid to produce hydrogen gas H2Mg + 2HCl ----> MgCl + H2 Calculate the volume (in
1. 5 answers
2. 5,867 views
Calculate the total pressure (in atm) of a mixture of 0.0300 mol of helium, He and 0.0200 mol of oxygen O2 in a 4.00 L flask at
1. 4 answers
2. 2,875 views
An aqueous solution of ammonium nitrate NH4NO2 decomposeds when heated to give off nitrogen.This reaction may be used to prepare
1. 2 answers
2. 785 views
Magnesium burns in air to produce magnesium oxide MgO and magnesium nitride Mg3N2. Magnesium nitride reacts with water to give
1. 4 answers
2. 2,503 views
What is the conversion for kPa to atmWhat is the conversion for dm^3 to L
1. 3 answers
2. 379 views
Chloroform CHCl3, is a volatile liquid solvent. Caculate the density of cholroform vapor at 98 degrees C and 797 mmHg. Give the
1. 4 answers
2. 2,758 views
what volume of water must be added to 10ml og 6.0M NaOH to make a solution that is .30 M in NaOHHow do I solve for this
1. 3 answers
2. 706 views
Hydrogen sulfide H2S is produced during decomposition of organic matter. when .5000 mol H2S burns to produce SO2 and H2O. -281.0
1. 5 answers
2. 1,783 views
A bullet weighing 235 grains is moving at a speed of 2.52 X 10^3 ft/s. Calculate the kinetcic energy of the bullet in joules ahd
1. 2 answers
2. 508 views
A bullet weighing 235 grains is moving at a speed of 2.52 X 10^3 ft/s. Calculate the kinetcic energy of the bullet in joules ahd
1. 6 answers
2. 2,106 views
with a platinum catalyst, ammonia will burn in oxygen to gove nitric oxide NO. What is the enthalpy change for the following
1. 1 answer
2. 490 views
Hydrogen sulfide, H2S is a foul smelling gas. It burns to form sulfur dioxide.2H2S +3O2 ----> 2N2 +6H2O Delta H=-1036kJ
1. 3 answers
2. 1,160 views
Hydrogen H2, is used asa rocker fuel. The hydrogen is burned in oxygen to produce water vapor.2H2 + O2 ----> 2H2O Delta H= -484
1. 2 answers
2. 830 views
With a platinum catalyst, ammonia will burn in oxygen to give nitric oxide, NO.4NH3 + 5O2 -----> 4NO + 6H2O Delta H= -906 kJ
1. 3 answers
2. 951 views
Hydrogen H2 is used as a rocker fuel. The hydrogen is burned in oxygen to produce water vapor.2H2 + O2 ----> 2H2O Delta H = -484
1. 2 answers
2. 807 views
Ethanol, C2H5OH is mixed with gasoline and sold as gasohol. Use the following to calculate the grams of ehanol needed to provide
1. 2 answers
2. 773 views
When 23.6 of calcium chloirde CaCl2 was dissolved in water in a calorimeter, the temperature rose from 25.0 degrees C to 21.56
1. 4 answers
2. 2,515 views
A sample of natural gas is 80.0% CH4 and 20.0% C2H6 by mass. What is the heat from the combustion of 1.00 g of this mixture?
1. 3 answers
2. 1,088 views
How much heat is released when a mixture containing 10.0g CS2 and 10.0 g Cl2 reacts by the equation.CS2 + 3Cl2 ----> S2Cl2 +
1. 4 answers
2. 1,092 views
Microwaves have frequencies in the range 10^9to 10^12/s (cycles per second) equivalent to between 1 gigahertz and 1 terahertz.
1. 4 answers
2. 1,333 views
Calculate the frequency associated with light of wavelength 656nm. (this corresponds to one of the wavelengths of light emitted
1. 4 answers
2. 2,282 views
The space probe Pioneer 11 was launched April 5,1973, and reached Jupiter in December 1974 traveling a distance of 998 million
1. 3 answers
2. 457 views
is 3.00 x 10^8 m/s the speed of light
1. 1 answer
2. 329 views
A sample of natural gas is 80.0% CH4 and 20.0% C2H6 by mass. What is the heat from the combustion of 1.00 g of this mixture?
1. 4 answers
2. 1,019 views
How much heat is released when a mixture containing 10.0g CS2 and 10.0 g Cl2 reacts by the equation.CS2 + 3Cl2 ----> S2Cl2 +
1. 2 answers
2. 676 views
What is the wavelength of a proton traveling at a speed of 6.21 km/s? What would be the region of the spectrum for
1. 2 answers
2. 522 views
What is the de Broglie wavelength of an oxygen molecule, O2 traveling at 521 m/s? Is the wavelength much smaller or much larger
1. 2 answers
2. 648 views
The space probe Pioneer 11 was launched April 5,1973, and reached Jupiter in December 1974 traveling a distance of 998 million
1. 1 answer
2. 434 views
What is the de Broglie wavelength of an oxygen molecule, O2 traveling at 521 m/s? Is the wavelength much smaller or much larger
1. 14 answers
2. 4,461 views
What is the wavelength of a proton traveling at a speed of 6.21 km/s? What would be the region of the spectrum for
1. 4 answers
2. 1,498 views
The space probe Pioneer 11 was launched April 5,1973, and reached Jupiter in December 1974 traveling a distance of 998 million
1. 10 answers
2. 988 views
What is the wavelength of the transition from n=4 to n=3 for Li2+? In what region of the spectrum does this emission occur? Li2+
1. 2 answers
2. 860 views
What is the wavelength of the transition from n=4 to n=3 for Li2+? In what region of the spectrum does this emission occur? Li2+
1. 4 answers
2. 843 views
Help needed for writing up a balance chemical equation for an acid/base titration:for an extended experimental experiment we
1. 2 answers
2. 576 views
What is the wavelength of the transition from n=4 to n=3 for Li2+? In what region of the spectrum does this emission occur? Li2+
1. 10 answers
2. 4,186 views
All of the following are true EXCEPT;A. the n=4 energy level has no f orbitals B. the 2p orbitals can have a maximum if 6
1. 3 answers
2. 609 views
The principal quantum number of the valence electrons in a atom of lead isA. 2 B. 3 C. 4 D. 5 E. 6
1. 4 answers
2. 2,377 views
The maximum number of electrons that can be accomodated in a p subshell isA.2 B.4 C.6 D. 8 E. 10
1. 3 answers
2. 391 views
How many valence electrons does phosphourous have
1. 1 answer
2. 377 views
Which of the following elements has the smallest ionization energy?A. F B. Be C. B D. Mg E. C
1. 2 answers
2. 1,200 views
The principal quantum number of the valence electrons in an atom of lead is:A. 2 B. 3 C. 4 D. 5 E. 6
1. 3 answers
2. 492 views
How do I do a tree diagram to find the least common multiple
1. 1 answer
2. 343 views
Use Lewis Symbols to show the reaction of atoms to form arsine, AsH3. Indicate bonding pairs in the Lewis formula of AsH3 are
1. 4 answers
2. 1,341 views
Decide which of the following bonds is least polar on the basis of electronegativities of atoms,H---S, Si---Cl, N---Cl.
1. 3 answers
2. 2,515 views
Can you tell me if i did these right??Lewis Dot Structure A. BrF = 5 dots around Br-F with 5 dots around it B. PBr3 = ? I don't
1. 3 answers
2. 1,075 views
write the resonance desription for the followingA. ClNO2 B. NO-2
1. 4 answers
2. 618 views
How do you make CIF2 into a Lewis Structure
1. 4 answers
2. 1,242 views
Which of the following molecules has polar bonds and is nonpolar?HF ICI3 NF3 SF4 BF3
1. 3 answers
2. 2,051 views
Which of the following indicates the exsistence of stron intermolecular forces of attraction in a liquid?a very low boiling
1. 3 answers
2. 658 views
Which of the following is a weak baseHOCl LiOH Ba(OH)2 KOH NH3
1. 5 answers
2. 1,900 views
All of the following are weak acids exceptHF H3PO4 H2SO4 HNO2 HC2H3O2
1. 6 answers
2. 2,788 views
When an aqueous solution of lithium chloride is mixed with an aqueous solution of ammonium sulfatea precipitate forms a new salt
1. 4 answers
2. 2,560 views
Which if the following compounds is insoluble in water(NH4)2CO3 AgBr CuSO4 KI LiNO3 I thought it might be AgBr
1. 2 answers
2. 927 views
Explain Why A Hot Air Balloon Rises
1. 1 answer
2. 457 views

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