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Questions Asked in 2007

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January 2007
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Most Popular Questions

Help on part "c":The forensic technician at a crime scene has just prepared a luminol stock solution by adding 19.0g of luminol
1. 8 answers
2. asked by K
3. 25,557 views
A helicopter is ascending vertically with a speed of 5.20 m/s. AT the height of 125m above the earth, a package is dropped from
1. 4 answers
2. asked by Bunty
3. 24,361 views
Thanks for any help :)Four 20 ohm resistors are connected in parallel and the combination is connected to a 20V emf device. The
1. 2 answers
2. asked by susane
3. 20,188 views
What is the pressure (in atmospheres) of the gas inside the container connected to an open-end, mercury-filled manometer as
1. 10 answers
2. asked by leo
3. 19,975 views
A wheel with rotational inertia I is mounted on a fixed, fricitonless axle. The angular speed w of the wheel is inccreased from
1. 11 answers
2. asked by Tammy
3. 18,215 views
If 500 J of work are required to carry a charged particle between two points with a potential difference of 40V, the magnitude
1. 4 answers
2. asked by susane
3. 17,833 views
An equation of the line tangent to the graph of y=(2x+3)/(3x-2) at the point (1,5) is...do I take the derivative of
1. 12 answers
2. asked by Anonymous
3. 17,815 views
For a molecule of fluorous acid, the atoms are arranged as HOFO.What is the formal charge on each of the atoms? Enter the formal
1. 6 answers
2. asked by K
3. 15,796 views
how do i write a net ionic equation for Lead (II) Nitrate and Sodium Carbonate react to form Lead Carbonate and Sodium Nitrate??
1. 3 answers
2. asked by caren
3. 15,696 views
The four tires of an automobile are inflated to an absolute pressure of 2.0*10^5 Pa. Each tire has an area of 0.024m^2 in
1. 4 answers
2. asked by Sarah
3. 15,588 views
A spring has a force constant of 100N/m and an unstretched lenght of .07 m. One end is attached to a post that is free to rotate
1. 5 answers
2. asked by Tammy
3. 15,373 views
A spinner is used for which it is equally probable that the pointer will land on any one of six regions. Three of the regions
1. 2 answers
2. asked by John
3. 15,161 views
1)The chemical formula for aspirin is C9H8O4. What is the mass of 0.40 mol of aspirin? How would I find this?2)The gram
1. 2 answers
2. asked by anonymous
3. 14,784 views
What are the expected bond angles in ICl4+ (or) ICl_4^+ ??I think that I have the stucture drawn correcty: I is the central atom
1. 10 answers
2. asked by K
3. 14,432 views
A 20.0 kg cannon ball is fired from a cannnon with muzzle speed of 1000 m/s at an angle of 37.0 with the horizontal. A second
1. 1 answer
2. asked by Jean
3. 14,395 views
An ideal massless spring is fixed to the wall at one end. A block of mass M attached to the other end of the spring oscillates
1. 1 answer
2. asked by Tammy
3. 14,200 views
The mass of a golf ball is 45.9g. If it leaves the tee with a speed of 72.0 m/s, what is its corresponding wavelength?Express
1. 6 answers
2. asked by K
3. 13,754 views
At 40 degrees Celsius, the value of Kw is 2.92 X 10^-14a.) calculate the [H+] and [OH-] in pure water at 40 degrees celsius
1. 5 answers
2. asked by Rebekah
3. 13,622 views
One end of a uniform meter stick is placed against a vertical wall. The other end is held by a lightweight cord that makes an
1. 1 answer
2. asked by Karla
3. 13,470 views
What volume of O2 is required to react with excess CS2 to produce 4.0L of CO2 Assume all gases at STP.Not sure what I am doing
1. 6 answers
2. asked by T
3. 13,275 views
What average force is required to stop an 1100-kg car in 8.0 s if it is traveling at 95 km/h?i got the answer to be 13062.5 N. i
1. 4 answers
2. asked by beckii
3. 13,052 views
A hollow, spherical shell with mass 2.00 kg rolls without slipping down a slope angled at 38.0 degrees. (a) Find the
1. 1 answer
2. asked by Karla
3. 12,917 views
Which statement best describes the polarity of SF_4Cl_2?? (or: SF4Cl2, if that helps more)1. Always polar. 2. Always nonpolar.
1. 10 answers
2. asked by K
3. 12,670 views
Why is CH3I have a higher boiling point than CH3Cl?I thought, since Cl is more electronegative, it withdraws more electron
1. 3 answers
2. asked by Vic
3. 12,458 views
C4H4 (g) + 2 H2 (g) --> C4H8 (g)Combustion reactions involve reacting a substance with oxygen. When compounds containing carbon
1. 3 answers
2. asked by Jayd
3. 12,342 views
Why Does The President Put Vegetables in His Blender?P.S.: It's puzzle 163 HELP!!!!!!!!!
1. 31 answers
2. asked by Dorina
3. 12,064 views
a particle moves along the curve xy=10. if x=2 and dy/dt=3, what is the value of dx/dt.i'm guessing this is something to do with
1. 1 answer
2. asked by Anonymous
3. 11,987 views
A 10 ohms resistor has a constant current. If 1200C of charge flow through it in 4 minutes what is the value of the current?A)
1. 3 answers
2. asked by susan
3. 11,745 views
Would the objects with the following densities float, sink, or remain suspended in tap water?(water=1.0g/mL)a.
1. 17 answers
2. asked by Sonic
3. 11,744 views
A culture starts at 8600 bacteria. After one hour the count is 10,000.Find a function that models the number of bacteria n(t)
1. 1 answer
2. asked by Jen
3. 11,378 views
a velocity vector of 40 degrees below the positive x-axis has a y-component of -10 m/s. What is the value of its x-component.I
1. 3 answers
2. asked by apoorva
3. 11,296 views
A cylinder is fitted with a piston, beneath which is a spring, as in the drawing. The cylinder is open at the top. Friction is
1. 1 answer
2. asked by Mary
3. 11,292 views
Arrange the following elements in order of decreasing atomic radius:Cs, Sb, S, Pb, Se *(list from largest to
1. 4 answers
2. asked by K
3. 10,780 views
List the following steps of the accounting cycle in their proper ordera. Preparing the post closing trial balance b. postint the
1. 2 answers
2. asked by shelly
3. 10,225 views
The nonmetals in Groups 6A and 7A ____.a. lose electrons when they form ions b. have a numerical charge that is found by
1. 3 answers
2. asked by Maye
3. 10,210 views
The electron from a hydrogen atom drops from an excited state into the ground state. When an electron drops into a lower-energy
1. 10 answers
2. asked by K
3. 10,201 views
Is NH4+ a polar or nonpolar bond?
1. 2 answers
2. asked by Lin
3. 10,074 views
A) a picture shows a container that is sealed at the top by a movable piston. Inside the container is a ideal gas at 1.00atm ,
1. 10 answers
2. asked by K
3. 10,058 views
A total resistance of 3 ohms is to be producd by combining an unknown resistor R with a 12 ohm resistor. What is the value of R
1. 4 answers
2. asked by susane
3. 10,003 views
Aluminum reacts with chlorine gas to form aluminum chloride via the following reaction:2Al(s) + 3Cl2(g) -> 2AlCl3(s) You are
1. 6 answers
2. asked by K
3. 9,904 views
A ball is attached to a string with length of L. It swings in a horizontal circle, with a constant speed. The string makes an
1. 7 answers
2. asked by ken
3. 9,733 views
What is the net ionic equation for the reaction Copper (II) chloride and sodium hydroxide?
1. 1 answer
2. asked by Avonlea
3. 9,686 views
When a block slides a certain distance down an incline the work done by gravity is 300 J. What is the work done by gravity if
1. 4 answers
2. asked by Tammy
3. 9,606 views
A box of books weighing 325 N moves at a constant velocity across the floor when the box is pushed with a force of 425 N exerted
1. 4 answers
2. asked by Sara
3. 9,593 views
1. Find the magnitude of the torque produced by a 3.0 N force applied to a door at a perpendicular distance of 0.25 m from the
1. 3 answers
2. asked by Anonymous
3. 9,592 views
3.0 mol sample of KClO3 was decomposed according to the equation 2KClO3 = 2KCl + 3 O2 How many moles of O2 are formed assuming
1. 2 answers
2. asked by jill
3. 9,575 views
Which of the following statements is true about the t-distribution with k degrees of freedom?i. the t-distribution is symmetric
1. 1 answer
2. asked by Anonymous
3. 9,537 views
A sign on the gas pump of a certain chain of gasoline stations encourages customers to have their oil checked, claiming that one
1. 3 answers
2. asked by Matt
3. 9,505 views
A record of travel along a straight path is as follows:1. Start from rest with constant acceleration of 2.77 m/s^2 for 15 s 2.
1. 4 answers
2. asked by Star
3. 9,458 views
A 650 kg weather balloon is designed to lift a 4600 kg package. What volume should the balloon have after being inflated with
1. 2 answers
2. asked by Anonymous
3. 9,307 views
what is a percusion insrumentPercussion instruments are played by being struck, shaken, rubbed or scraped. They are perhaps the
1. 1 answer
2. asked by Crystal
3. 9,038 views
Arrange the following compounds in order of increasing solubility in water:* O2 * LiCl * Br2 * CH3OH Like dissolves like; that
1. 3 answers
2. asked by Belinda
3. 9,005 views
At 1100 K, Kp=0.25 for the following reaction. 2SO2(g) + O2(g) (reversible arrows) 2SO3(g) What is the value of K at this
1. 2 answers
2. asked by Taasha
3. 8,960 views
HOW CAN U TELL IF HNO3 +KNO3 IS A BUFFER SOLUTIONA buffer solution must contain a weak acid and its conjugate base OR a weak
1. 1 answer
2. asked by CANDY
3. 8,928 views
Questions:Are the following workers more likely to experience short-term or long-term unemployment? Explain. a. A construction
1. 2 answers
2. asked by Sarah
3. 8,917 views
A 1.0-kg ball on the end of a string is whirled at a constant speed of 2.0 m/s in a horizontal circle of radius 1.5 m. What is
1. 5 answers
2. asked by Marisol
3. 8,891 views
while driving his sports car at 20.0 m/s down a four-lane highway, eddie comes up behind a slow-moving dump truck and decides to
1. 5 answers
2. asked by confusedd!
3. 8,869 views
Hey! i want to know what is the importance of mitosis when it comes to growth, asexual reproduction and repair.Thankkkksss in
1. 12 answers
2. asked by Mallory
3. 8,865 views
We performed a lab that studied osmosis in potato cells. We put cylinders of potato into varying molar Sucrose solutions and
1. 3 answers
2. asked by Jessie
3. 8,857 views
A bag contains 9 red chips and 12 blue chips. Two chips are selected randomly without replacement from the bag. What is the
1. 1 answer
2. asked by J
3. 8,804 views
For the normal force in Figure 5.21 to have the same magnitude at all points on the vertical track, the stunt driver must adjust
1. 1 answer
2. asked by Mary
3. 8,703 views
a collapsible plastic bag contains a gluccose solution. If the average gauge pressure in the atery is 1.33x10^4Pa, what must be
1. 4 answers
2. asked by Anonymous
3. 8,690 views
In a gas mixture of He, Ne, and Ar with a total pressure of 8.40 atm, the mole fraction of Ar is ________ if the partial
1. 3 answers
2. asked by john
3. 8,598 views
Commercial vinegar was titrated with NaOH solution to determine the content of acetic acid, HC2H3O2. For 20.0 milliliters of the
1. 1 answer
2. asked by Sarah
3. 8,546 views
The bearing of A from B is 060 degrees. What is the bearing of B from A?Is it: a) 60 degrees b) 240 degrees c) 120 degrees d)
1. 16 answers
2. asked by Fred
3. 8,501 views
A body of mass 5.0 kg is suspended by a spring which stretches 10 cm when the mass is attached. It is then displaced downward an
1. 1 answer
2. asked by shan
3. 8,473 views
Standard Normanl Drill:A. Find the number z such that the proportion of observations that are less than z in a standard Normal
1. 3 answers
2. asked by Devon
3. 8,371 views
My balanced equation is:a) 2C8H18(g) + 25O2(g) -> 16CO2(g) + 18H2O(g) b) 0.290 mol of octane is allowed to react with 0.670mol
1. 4 answers
2. asked by K
3. 8,137 views
I have a few question about an equilibrium lab we performed.Approximately .1 g of CoCl2 * 6H2O was mixed with 2 mL of 12 M HCl.
1. 0 answers
2. asked by Kim
3. 8,127 views
Propane (C3H8) burns in oxygen to produce carbon dioxide and water vapor. The balance equation for this reaction is C3H8 + 5O2
1. 2 answers
2. asked by Katie
3. 7,906 views
write 2 1/4 as a percent.
1. 11 answers
2. asked by tiffany
3. 7,603 views
I'm trying to find if potassium nitrate is polar or non-polar by using the electronegativity scale. Can someone check my work?El
1. 1 answer
2. asked by Marty
3. 7,590 views
A road perpendicular to a highway leads to a farmhouse located 8 mile away.An automobile travels past the farmhouse at a speed
1. 5 answers
2. asked by lo
3. 7,505 views
Given2Al2O3 (s) --> 4Al(s) + 3O2 (g) (standard enthalpy change= 3351.4 kJ) a) What is the heat of formation of aluminum oxide?
1. 1 answer
2. asked by Chris
3. 7,405 views
A 10.0-kg cylinder rolls without slipping on a rough surface. At the instant its center of amss has a speed of 10m/s, determine
1. 5 answers
2. asked by cyndi
3. 7,371 views
A 1000kg sports car accelerates from 0 to 25m/s in 7.5s what is the average power delivered by the engine?i know that POWER=
1. 2 answers
2. asked by magic 8 ball
3. 7,331 views
You are reducing a map of dimensions 2 ft by 3 ft to fit to a piece of paper 8 in by 10 in. What are the dimensions of largest
1. 4 answers
2. asked by keisha
3. 7,329 views
A 4 kg block is pushed along the ceiling with a constant applied force of 85 N that acts at an angle of 55 degrees with the
1. 4 answers
2. asked by Christy
3. 7,328 views
what is the theoretical mole ratio- NaCl to NaHCO3How do you determine the percentage error of an experimental mole ratio It
1. 2 answers
2. asked by CHEMISTRY HELP
3. 7,310 views
A water slide is constructed so that swimmers, starting from rest at the top of the slide leave the end of the slide traveling
1. 1 answer
2. asked by ajo
3. 7,301 views
<b>(a)calculate the mass percent of carbon in the hydrated form of the solid that has the formula BeC2O4 X 3 H2O (s).</b>I
1. 3 answers
2. asked by Patrick
3. 7,294 views
a cube of wood with a density of 0.78g/cm^3 is 10cm on a side. When placed in the water what height will the block float above
1. 2 answers
2. asked by PHYSICS HELP
3. 7,194 views
what is the sum of geometric infinite series 3/2+ 9/16+ 27/128+ 81/1024=....i know the formula is S=a/(1-r) my teacher, he
1. 4 answers
2. asked by david
3. 7,184 views
what mass of protons would be required to just neutralize the charge of 1.0g of electrons?how do I answer this? You know the
1. 4 answers
2. asked by Chris
3. 7,178 views
what is the oxidation state of chlorine in Cl2O7
1. 3 answers
2. asked by Anonymous
3. 7,167 views
a stock clerk had 600 pads on hand. He then issued 3/8 of his supply of pads to division X,1/4 to division Y and 1/6 to division
1. 1 answer
2. asked by chrissy
3. 7,145 views
Can somebody please help me with this problem?This is the index-„³ 5 6^-5 The radical sign did not show, but the problem is:
1. 1 answer
2. asked by Larry
3. 7,112 views
A 0.345g sample of anhydrous BeC2O4, which contains an inert impurity, was dissolved in a sufficient water to produce 100ml of
1. 4 answers
2. asked by michelle
3. 7,101 views
A torpedo fired from a submerged submarine is propelled through the water with a speed of 20.00 m/s and explodes upon impact
1. 1 answer
2. asked by confusedd!HELPP!!!
3. 7,099 views
a change in pressure would have the greatest effect on the solubility of aA. solid in a liquid B. gas in a liquid C.liquid in a
1. 4 answers
2. asked by Kat
3. 7,091 views
An isosceles right triangle has an area of 98cm squared. Find the length of each leg.The formula of finding the area of a
1. 2 answers
2. asked by gr8
3. 7,057 views
trying to look for a 7 letter word using music notescdeeffggaabb is this a damn trick question. best i can do is badge What
1. 1 answer
2. asked by nicole
3. 7,032 views
Magnesium sulfate is often used it first aid hot-packs giving off heat when dissolved in water. When 2.00 g of MgSO4 dissolves
1. 4 answers
2. asked by Chris
3. 7,004 views
A 0.15 kg baseball moving at +26 m/s is slowed to a stop by a catcher who exerts a constant force of -390 N. How long does it
1. 2 answers
2. asked by julia
3. 6,984 views
A .100 kg meter stick is supported at its 40.0 cm mark by a string attached to the ceiling. A .700 kg mass hangs vertically from
1. 1 answer
2. asked by Anonymous
3. 6,951 views
A fisherman notices that his boat is moving uo and down periodically, owing to waves on the surface of the water. It takes 2.5 s
1. 6 answers
2. asked by Jen
3. 6,895 views
Two liquids, n-pentane and 1-butanol, have nearly the same molecular weight, but significantly different temperature values. Why
1. 1 answer
2. asked by Chemwiz
3. 6,864 views
Which of the following has a standard enthalpy of formation value of zero at 25 degrees C and 1.0 atmA. Fe(s) B. Fe2O3(s) C.
1. 6 answers
2. asked by Chemistry
3. 6,778 views
A driver in a car traveling at a speed of 60 mi/h sees a deer 100 m away on the road. Calculate the minimum constant
1. 1 answer
2. asked by Anonymous
3. 6,643 views
How many moles of solid Ba(NO3)2 should be added to 300 ml of .2 M Fe(NO3)3 to increase the concentration of NO3- ion to 1 M?
1. 1 answer
2. asked by corey
3. 6,550 views

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