# Hannah

Popular questions and responses by Hannah-
## statistics

According to a college survey, 22% of all students work full time. Find the mean and standard deviation for the number of students who work full time in samples of size 16.

*asked on March 16, 2015* -
## English

The 'White House' has been home to many animals as well as presidents. (1 point) common noun proper noun compound noun collective noun

*asked on September 24, 2014* -
## language arts

IN the poem “Swift Things are Beautiful” by Elizabeth Coatsworth reveals that every thing is beautiful in its own way. Although the title says that only swift things are beautiful, the poet also lists slow things that are beautiful. She uses unusual

*asked on April 25, 2010* -
## Chemistry

1)How many protons and electrons are in a sulfate ion SO4^2- ? I know the answer is 48 protons and 50 electrons but i do not know how to get this from the ion. 2) What is the charge on a sulfide ion? The answer is -2 but im not sure why. Is sulfide always

*asked on December 4, 2011* -
## Math

You roll two fair dice. Let E be the event that an even total shows on the dice. Let F be the event that a three shows on at least one die. Find P(F) and P(F∣E).

*asked on September 18, 2016* -
## Physics(Please help)

1) two hot-air balloons are 48.2 m and 61.0 m above the ground. A person in the left balloon observes that the right balloon is 13.3° above the horizontal. What is the horizontal distance x between the two balloons? The left balloon is 48.2m and the right

*asked on May 25, 2012* -
## Chemistry(Please check answer)

The solubility product expression for mercury(I) iodide, Hg2I2 is Ksp = ? My answer is [Hg2^2+^][2I^-^]^2^ Would you agree?

*asked on April 8, 2012* -
## Data Management

How many ways can the manager of a baseball team put together a batting order of his nine players, if the shortstop must bat 3rd?

*asked on April 16, 2013* -
## Chemistry

The heat of vaporization of benzene, C6H6, is 30.8kJ/mol at its boiling point of 80.1 degrees celsius. How much energy in the form of heat is required to vaporize 102g of benzene at its boiling point? I know that the answer is 24.2kJ but i am not sure how

*asked on February 5, 2012* -
## Math

Two ocean beaches are being affected by erosion. The table shows the width, in feet, of each beach at high tide measured where 1995 is represented by year 0. Western beach width Dunes beach Year number (in feet) width (in feet) 0 100 20 5 90 45 10 80 70 11

*asked on December 10, 2015* -
## physics

Two artificial satellites, 1 and 2, orbit the Earth in circular orbits having radii R1 and R2. If R2=2R1, the accelerations a2 and a1 of the satellites are related how?

*asked on January 19, 2008* -
## chemistry

disappearance of NO in ...- Help!!!? The following data were collected for the rate of disappearance of NO in the reaction 2 NO(g) + O2(g) ¨ 2 NO2(g). Run: [NO](M) [O2](M) Initail Rate (M/s) 1 .0126 .0125 1.41 X 10^-2 2 .0252 .0125 5.64 X 10^-2 3 .0252

*asked on January 30, 2013* -
## Educational tech (Please check my answers)

Which of the following terms refers to legal protection provided against copying, distributing, performing, or changing both published and unpublished works? a. Intangible property b. tangible property c. copyright****** d. intellectual property What is

*asked on February 25, 2014* -
## Physics(Please check)

A rectangular plate is rotating with a constant angular speed about an axis that passes perpendicularly through one corner, as the drawing shows. The centripetal acceleration measured at corner A is n times as great as that measured at corner B. What is

*asked on June 5, 2012* -
## Math

In a survey of 300 college graduates, 58% reported that they entered a profession closely related to their college major. If 6 of those survey subjects are randomly selected without replacement for a follow-up survey, what is the probability that 3 of them

*asked on March 16, 2015* -
## Data Management

A bag contains three green Christmas ornaments and four gold ornaments. If you randomly pick two ornaments from the bag, at the same time, what is the probability that both ornaments will be gold?

*asked on April 16, 2013* -
## chem- check my answer

magnesium hydroxide + hydrobromic acid --> is the formula for that Mg(OH)2(s) + HBr(aq) ->H2O(l) +BrOH(s) and are the physical states correct??

*asked on April 9, 2011* -
## Math

The function D(h)=7e^-0.4(h) can be used to determine the milligrams D of a certain drug in a patient's bloodstream h hours after the drug has been given. How many milligrams will be present after 9 hours. Round three decimal places. so 7e^(-0.4 x 9) =

*asked on November 3, 2010* -
## Chemistry

1) What is the atomic # for selenium? 34 2) Write the full electron configuration for selenium following the (n+l) rule? I am not sure what is meant by n+l 3) write the electron configuration, grouping electrons by their "n" values. [Ar]3d10 4s2 4p4 Are

*asked on November 1, 2011* -
## Chemistry(Please help, thank you!!)

What is the oxidation number of sulfur (s) in NaHSO3? I know that Na is 1 but I do not know what else to do. Please explain, thank you for your help!!

*asked on September 26, 2011* -
## Physics

What is the work required to raise a 10. kg object from the surface of the Earth to a height of 2.0 m? 5.0 J 20. J 2.0 E2 J 2.0 E3 J My answer was 20. J but this was wrong. Is the answer 2.0 E2 J? A net force of 9.0 N acts through a distance of 3.0 m in a

*asked on October 22, 2009* -
## Chemistry

Write the net ionic equation for the reaction that occurs when aqueous solutions of barium hydroxide and hydrobromic acid are combined. I know that the first part of the formula would be BaOH + HBr but I do not know what the product would be since HBr is

*asked on October 9, 2011* -
## Psychology

Advertisers have been using the principles of classical conditioning for years in attempt to associate pleasant feelings with their products. Beer ads are particularly famous for doing so by placing scantily clothed women holding beer bottles on large

*asked on November 15, 2009* -
## physics

Two blocks are pushed along a horizontal frictionless surface by a force of 20 newtons to the right. The force acts on the 3 kg block, which in turn pushes the 2kg block sitting next to it. The force that the 2-kilogram block exerts on the 3-kilogram block

*asked on January 20, 2008* -
## Math

Adult tickets for the school play cost $5 and student tickets cost $3. Thirty more student tickets were sold than adult tickets. If $1770 was collected, how many of each type of ticket was sold?

*asked on March 2, 2014* -
## chem

In an excess of NH3(aq), Cu2+ ion forms a deep blue complex ion, Cu(NH3)42+, which has a formation constant Kf = 5.6 1011. Calculate the Cu2+ concentration in a solution prepared by adding 4.8 10-3 mol of CuSO4 to 0.500 L of 0.32 M NH3.

*asked on March 28, 2013* -
## Physics(Please respond)

A 12-kg crate is pushed up an incline from point A to point B. What is the change in the gravitational potential energy of the crate? Point A is 2.0m and point b is 7.0m I am not sure how to start this.

*asked on May 31, 2012* -
## Physics(Please help)

A football is kicked with a speed of 18 m/s at an angle of 65° to the horizontal. How long is the football in the air? Neglect air resistance Would I use the equation y=y0 + voy t -1/2gt^2 ?

*asked on May 25, 2012* -
## Physics(Please help)

Three forces act on a hockey puck as it slides across the ice, and it is in equilibrium. The force F is applied at the center and has a magnitude of 25 N. The force F1 is applied at the top edge, and F2 is applied half way between the center and the bottom

*asked on June 5, 2012* -
## Math

A carpenter has a board that is 8 feet long. He cuts off to pieces. One piece is three and a half feet long and the other is 2 1/3 feet long. How much of the board is left?

*asked on January 25, 2017* -
## Pre-Calc

A rectangular package to be sent by a delivery service can have a maximum combined length and girth (perimeter of a cross section) of 120 inches. a. Show that the volume of the package is V(x)= 4xsquared(30-x) b. Use your graphing calculator to find the

*asked on September 26, 2010* -
## History

Which suggests the most critical aspect of the peak oil theory?

*asked on May 18, 2020* -
## chem

Consider the titration of 30.0 mL of 0.050 M NH3 with 0.025 M HCl. Calculate the pH after the following volumes of titrant have been added. (The Kb for NH3 is 1.8e-05.) (a) 0 mL . (b) 25.0 mL . (c) 59.0 mL . (d) 60.0 mL (e) 63.0 mL (f) 67.5 mL

*asked on March 25, 2013* -
## Math(Please help)

Related Rates: Gas is escaping from a spherical balloon at the rate of 2ft^3/min. How fast is the surface area shrinking (ds/dt) when the radius is 12ft? (A sphere of radius r has volume v=4/3 pi r^3 and surface area S=4pi r^2.) Remember that ds/dt = ds/dr

*asked on March 4, 2011* -
## chem

(a) At 800 K the equilibrium constant for I2(g) 2 I(g) is Kc = 3.1 10-5. If an equilibrium mixture in a 10.0-L vessel contains 3.25 10-2 g of I(g), how many grams of I2 are in the mixture? (b) For 2 SO2(g) + O2(g) 2 SO3(g), Kp = 3.0 104 at 700 K. In a

*asked on February 20, 2013* -
## Chemistry(Please check)

1) The reaction: A + 3B = D + F was studied and the following mechanism was finally determined A+B=C (fast) C+B=D+E (slow) E+B=F (very fast) Which step has the largest activation energy? I chose the second step because it is slow and should have the most

*asked on February 24, 2012* -
## Chemistry

1)Which compound below would be expected to have the highest boiling point? a) CH3-CH2-CH2-CH2-CH2-CH2-CH3 b) CH3-CH2-CH2-CH2-CH-CH3 | CH3 c) CH3-CH-CH2-CH-CH3 | | CH3 CH3 d) CH3 | CH3-CH-C-CH3 | | CH3 CH3 Do I use molar mass to determine which is the

*asked on January 30, 2012* -
## Education technologoy

Charles sends Julia text messages every morning insulting her appearance and threatening to hurt her. He writes unflattering description of her on blog and on his own personal website a. identity theft b. cyberstalking c. online arguing d. cyberbullying

*asked on February 11, 2014* -
## Chem

Consider the reduction of 4-t-butylcyclohexanone. If the procedure calls for 153 mg of 4-t-butylcyclohexanone, what mass of sodium borohydride should be added?

*asked on August 18, 2012* -
## Chemistry

Bauxite ore contains aluminum oxide Al2O3(s) which is decomposed using electricity to produce aluminum metal and oxygen gas. What mass of aluminum metal can be procuced from 155g of aluminum oxide?

*asked on February 19, 2012* -
## Geometry

An exterior angle of an isosceles triangle has measure 150°. Find two possible sets of measures for the angles of the triangle. If the exterior angle of the bases is 150°, then the measure of the angle of each base is _° and the measure of the vertex

*asked on December 18, 2016* -
## Physical Science

Green light has a frequency of about 5.3Hz×1014Hz. Using the relationship c=fλ, find its wavelength in air.

*asked on July 23, 2016* -
## Physics

What is the longest wavelength of light that can be absorbed by a hydrogen atom that is initially in the second excited state?

*asked on June 22, 2016* -
## Chemistry(Please respond, thank you)

What is the [H3O+] for a neutral solution at 50 degrees celsius? I know that kw=[H3O+][OH-] but I am not sure what to do to get the H3O. The value I have for kw=5.76e-14 and I have the pH 6.62 but I do not know what the OH would be. Chemistry(Please help,

*asked on April 1, 2012* -
## Chemistry

Calculate the density of sulfur trioxide gas at 35 degrees celsius and 715 torr pressure. I know that d=m/v = PM/RT. Im not sure how to set this up. I know the molar mass of sulfur trioxide is 80.0642 but im not sure if I need to use that.

*asked on January 11, 2012* -
## physics

The radius of the Earth is approximately 6000 km. The acceleration of an astronaut in a perfectly circular orbit 300 km above the Earth would be most nearly. For this question I simply guessed. I knew "a" was 9.8 on the surface, and my answers were 0,

*asked on January 20, 2008* -
## Physics

A 4-kilogram mass has a speed of 6 m/s on a horizontal frictionless surface. The mass collides head-on and elastically with an identical 4-kilogram mass initially at rest. The second 4-kilogram mass then collides head-on and sticks to a third 4-kilogram

*asked on January 17, 2008* -
## Math

Determine the required number of branches in the tree diagram described. A tree diagram showing how many ways a nickel, a regular die, and a quarter could be flipped. I did a tree diagram with the die having six branches, the nickel having two, and the

*asked on January 20, 2017* -
## chem

A 2.241 g sample of nickel reacts with oxygen to form 2.852 g of the metal oxide. Calculate the empirical formula of the oxide. 1)NiO Give the number of moles of each element to support you answer. moles of Ni 2) 1.339 mol moles of O 3)1.34 mol I know #1

*asked on November 12, 2010* -
## Pre-Cal

1)tan 5 degrees + tan 25 degrees / 1 tan 5 degrees tan 25 degrees = sqrt 3 / 3 Am I correct? 2) Complete the identity tan^2Q - 3sinQtanQsecQ = -2tan^2Q Correct?

*asked on March 10, 2010* -
## math

What is a 15% tip on a meal that costs $38.40

*asked on November 28, 2016* -
## DR BOB PLEASE HELP CHEM

Consider the reduction of 4-t-butylcyclohexanone. If the procedure calls for 153 mg of 4-t-butylcyclohexanone, what mass of sodium borohydride should be added?

*asked on August 19, 2012* -
## Chemistry

Consider the reaction: PCl3(g) + Cl2(g) PCl5(g). If [PCl3] = 0.78 M, [Cl2] = 0.44 M, and [PCl5] = 0.88 at equilibrium, what is the value of K? A.0.39 B.1.4 C.2.6 D.0.72 Thanks!

*asked on March 21, 2012* -
## Physics

The angular speed of a propeller on a boat increases with constant acceleration from 12 rad/s to 26 rad/s in 2.5 revolutions. What is the acceleration of the propeller?

*asked on December 17, 2011* -
## chemistry

sulfur dioxide (g) + oxygen (g) sulfur trioxide (g) SO2 + O = SO3 Is this correct for the balanced equation?

*asked on November 20, 2011* -
## Chemistry(please check, thank you!!)

Is this equation balanced? CoCl2(aq) + Na2CO3(aq) -> CoCO3(s) + 2NaCl(aq) I think that it is because there is 1 Co on the left and 1 on the right. There is 2 cl on the left and 2 on the right. 2 Na on the left and 2 on the right and 3 CO on left and on

*asked on October 5, 2011* -
## CHEMISTRY

Given the following heats of combustion. CH3OH(l) + 3/2 O2(g) -> CO2(g) + 2 H2O(l) ΔH°rxn = -726.4 kJ C(graphite) + O2(g) ->CO2(g) ΔH°rxn = -393.5 kJ H2(g) + 1/2 O2(g) -> H2O(l) ΔH°rxn = -285.8 kJ Calculate the enthalpy of formation of methanol

*asked on September 22, 2008* -
## Math Check my Answers please ?

1.)if an object is dropped from a height of 144 ft the function h(t)=-16t^2+144 gives the height of the object after t seconds. when will the object hit the ground? a.)1.5 seconds b.)3 seconds *** c.) 6 seconds d.)9 seconds 2.) the area of a play ground is

*asked on April 12, 2016* -
## Thermochemistry

3CO(g)+ Fe2O3(s) --> 2Fe(s) + 3CO2(g) + 24.7 kJ. How much heat is released when 56 grams of CO react?

*asked on December 14, 2010* -
## Math(Please help)

Betsy, a recent retiree, requires $6,000 per year in extra income. She has $70,000 to invest and can invest in B-rated bonds paying 17% per year or in a CD paying 7% per year. How much money should be invested in each to realize exactly $6,000 in interest

*asked on September 19, 2010* -
## algebra. help!

Is 4x-3=19 true, false, or open? Which of the following is a solution to the equation 16=4x-4? a. -5 b. -4 c. 5 d. 16

*asked on September 24, 2014* -
## chem

Silver chloride, often used in silver plating, contains 75.27% Ag. Calculate the mass of silver chloride in grams required to make 4.7 g of silver plating.

*asked on November 11, 2010* -
## Physics(Please check)

A uniform plank of length 5.0 m and weight 225 N rests horizontally on two supports, with 1.1 m of the plank hanging over the right support (see the drawing). To what distance x can a person who weighs 404 N walk on the overhanging part of the plank before

*asked on June 8, 2012* -
## Chemistry

How many grams of water are needed to dissolve 27.8g of NH4NO3 (80.0 g/mol) in order to prepare a 0.452 m (molal) solution? 27.8g / 80g/mol X 0.452 = 0.157 Is this correct?

*asked on February 12, 2012* -
## Chemistry(Please help, thank you)

Find the value of delta H net for the following equation: SnBr2(s) + TiCl4(l) -> TiBr2(s) + SnCl4(l) Use the following reactions to help solve for the net value: 1) SnCl2(s) + TiBr2(s) -> SnBr2(s) + Ticl2(s) Delta H=+4.2 2) SnCl2(s) + Cl2(g) -> TiCl4(l)

*asked on February 4, 2012* -
## math brain teaser

more it it thani what does that mean??? also: EVELATOR and: DENTURES E F

*asked on November 24, 2010* -
## Chemistry(Please check)

1) Which of the following is not amphiprotic? H20, NH4^+^, HSO4^-^, H2PO4^-^, all choices are amphiprotic. I think that all of these are amphiprotic. I know for sure that H20 and H2PO4^-^ are. 2) The ion HPO4^-^ has both a conjugate base as well as a

*asked on March 24, 2012* -
## Physical Science

Many people mistakenly believe that the astronauts who orbit Earth are "above gravity." Earth's mass is 6×1024kg, and its radius is 6.38×106m (6380 km). Use the inverse-square law to find a height above Earth's surface at that the force of gravity on a

*asked on June 21, 2016* -
## Math

Please help ! 1.)a catapult launches a boulder with an upward velocity of 122 feet per second. the height of the boulder, h, in feet after t seconds is givin by the function h(t)=-16t^2+122t+10. what is the boulders maximum height ? and how long does it

*asked on April 11, 2016* -
## Physics

A motor cyclist travelling at 12m/s decelerates at 3m/s square a) how long does he take to come to a rest b) how far does he travel in coming to rest

*asked on September 10, 2015* -
## physics

A 755 N diver drops from a board 10.0m above the water's surface.Find the diver's speed 5.00 m above the water's surface. Then find the diver's speedjust before striking the water.

*asked on November 5, 2014* -
## chem

The decomposition of sulfuryl chloride (SO2Cl2) is a first-order process. The rate constant for the decomposition at 660 K is 4.5 10-2 s-1. (a) If we begin with an initial SO2Cl2 pressure of 425 torr, what is the pressure of this substance after 74 s? what

*asked on February 2, 2013* -
## Physics(Please respond)

A source emits sound uniformly in all directions. There are no reflections of the sound. At a distance of 12 m from the source, the intensity of the sound is 1.7 × 10-3 W/m2. What is the total sound power P emitted by the source? Would I do 1.7e^-3 (12) ?

*asked on June 20, 2012* -
## chemistry

In the 1970s, when lead was widely used in "ethyl" gasoline, the blood level of the average American contained 0.25 ppm lead. The danger level of lead poisoning is 0.80 ppm. (a) What percent of the average person was lead? (b) How much lead would be in an

*asked on March 19, 2012* -
## Chemistry(Please check)

For the reaction, 2 SO2(g) + O2(g) == 2 SO3(g), at 450.0 K (Kelvin) the equilibrium constant, Kc, has a value of 4.62. A system was charged to give these initial concentrations, (SO3) = 0.254 M and (O2) = 0.00855 M, and (SO2) = 0.500 M. In which direction

*asked on March 3, 2012* -
## Chemistry

1) What is the charge on the ion that Selenium forms in an ionic compound? I am not sure about this. 2) What noble gas is isoelectronic with this ion. I was thinking Krypton because it is a noble gas and it is the closest to Selenium but I am not sure. 3)

*asked on November 2, 2011* -
## Thermochemistry

How many grams of water at 0 degrees C can be frozen into ice at 0 degrees C if 55.0 kJ of heat is removed? delta Hsolid= -6.01 kJ/mol

*asked on December 14, 2010* -
## Calculus

Determine whether the integral is divergent or convergent. If it is convergent, evaluate it and enter that value as your answer. If it diverges to infinity, state your answer as "INF" (without the quotation marks). If it diverges to negative infinity,

*asked on October 22, 2010* -
## algebra

A ball is thrown into the air with an upward velocity of 40 feet per second. Its height, h, in feet after t seconds is given by the function h(t)=-16t^2+40t+10. a. What is the ball’s maximum height? 35Ft b. When the ball hits the ground, how many seconds

*asked on January 7, 2018* -
## Chemistry(Please check)

The equilibrium constant, Kc for the system, CaO(s) + CO2(g) == CaCO3(s), is A. Kc = (CaO) (CO2) / (CaCO3) B. Kc = (CO2) C. Kc = (CaCO3)/(CaO) D. Kc = (CaCO3) / (CaO) (CO2) E. Kc = 1 / (CO2) My answer is (CaCo3) / (CaO)(CO2). Would you agree?

*asked on March 3, 2012* -
## chemistry(Urgent Please help)

A student is asked to standardize a solution of barium hydroxide. He weighs out 0.945 g potassium hydrogen phthalate (KHC8H4O4, treat this as a monoprotic acid). It requires 33.9 mL of barium hydroxide to reach the endpoint. A. What is the molarity of the

*asked on November 20, 2011* -
## mathematics

convert r=6cos(theta) to rectangular coordinates

*asked on May 13, 2020* -
## Algebra

In a right triangle, one angle measures x degrees where sin x degrees= 5/8. What is the value of cos (90 degrees-x) ?

*asked on February 14, 2016* -
## Physics

A 45 kg girl is sitting on one end of a see-saw, 0.6 m away from the the pivot pt. How far away form the pivot pt must a 60 kg boy sit on the other side in order for the see saw o be balanced?

*asked on October 11, 2015* -
## Science

1. How does groundwater cause erosion and deposition? a. When acidic water soaks into the ground, water dissolves limestone, resulting in the formation of caves. *** b. When a river overflows, it moves downhill, resulting in the formation of caves. c. When

*asked on March 3, 2014* -
## Physics(Please check)

Which equations are dimensionally correct? F=ma E=max X=(1/2)at^3 V=sqrt(2*fx/m) E=(1/2)mv I think that F=ma , E=(1/2)at^3, V=sqrt(2*fx/m) are correct. Would you agree?

*asked on May 21, 2012* -
## Chemistry - Please Check!

Determine the mass of zinc sulphide, ZnS, produced when 6.2g of zinc and 4.5g of sulphur are reacted. Equation given: Zn + S8 >> ZnS Balanced equation: 8Zn + S8 >> 8ZnS nZn= 6.2 g/ (65.39 g/mol) = 0.095 mol nS8= 4.5 g/(256.48 g/mol) = 0.018 mol nS8 = 0.095

*asked on March 14, 2012* -
## Chemistry(Please check)

The initial concentration of a reactant in a first order reaction is 0.620 molar. What will be its concentration after 3 half-lives? I did 0.620 -> 0.31 ->0.155 0.155M will be the concentration. Is this correct?

*asked on February 19, 2012* -
## Chemistry(Please help, thank you!!!)

Write the balanced, complete, and net ionic equations for each precipitation reaction. 1) AgNO_3 + CoCl_2 ---> BE: AgNO_3(aq) + CoCl_2(aq) ---> AgCl_2 (aq) + Co(NO_3)(aq) CIE: Since the balanced equation is all (aq) there is no reaction so no complete or

*asked on September 24, 2011* -
## Math

A manufacturer estimates that the profit P from producing x units of a commodity is P=-x^2+40x-100 dollars per week. What is the maximium profit he can realize in one week? I was going to take the derivative of the equation and set it equal to 0 and then

*asked on February 26, 2011* -
## algebra ll

the first equation of the system is muti plied by 2. by what number would you mutiply the second equation to elimi nate the x variable by adding? first: 6x - 5y equals 21 second: 4x plus 7y equals 15 and another one is the first equation of the system is

*asked on August 12, 2008* -
## Langugae Arts

11. Read the following sentence from “The Balek Scales.” My grandfather was the first person bold enough to test the justice of the Baleks, the family who lived in the chateau and drove two carriages, who always maintained one boy from the village

*asked on December 6, 2016* -
## Language Arts

Which word in the following sentence is an adjective? Jack trudged home through deep snow. (1 point) • trudged (this one) • through • deep • home 7. Which of the following words is a synonym for beseeched in the following sentence? Nathan beseeched

*asked on January 27, 2015* -
## American Government

A ______ might consider the compromises struck during the health care reform debate to be an example of lit interest groups each pursuing and achieving their separate sets of agendas? a) plural elitist b) fundamentalist c) conspiracy theorists d) Both A

*asked on November 29, 2014* -
## Social Studies

1. The leaders of the Virginia Company recruited more settlers and reorganized the colony. They allowed the new settlers to own land. Those settlers began to grow tobacco, a crop they learned about from the Indians. By 1612, Virginians were shipping

*asked on October 3, 2014* -
## math

Solve the compound inequality. -3 < 2x - 3 < 5

*asked on October 16, 2013* -
## statistics

Most Americans, 67% in fact, say frequent handwashing is the best way to fend off the flu. Despite that, when using public restrooms, women wash their hands only 66% of the time and men wash only 43% of the time. Of the adults using the public restroom at

*asked on September 20, 2013* -
## chemistry

4. A container of gas has a volume of 3.5 L and a pressure of 0.8 atm. Assuming the temperature remains constant, what volume of gas would result if the pressure was 0.5 atm? A. 1.8 L B. 5.6 L C. 0.2 L D. 2.2 L My guess is B but I just want to double check

*asked on August 15, 2013* -
## chem

Cobalt-60 is a strong gamma emitter that has a half-life of 5.26 yr. The cobalt-60 in a radiotherapy unit must be replaced when its radioactivity falls to 75% of the original sample. If an original sample was purchased in October 2005, when will it be

*asked on September 5, 2012* -
## Chemistry(Please check, thanks)

Which choice below has the highest standard molar entropy? SiCl4(s), CCl4(g), CCl4(l), Si(Cl4(l) I know that the gas state has the largest entropy so SiCl4(s) would have the highest. Is my answer correct? Thank you!!

*asked on April 22, 2012*