Tuesday

November 24, 2015
Total # Posts: 893

**Chemistry **

In the following reaction, how many grams of ferrous sulfide will produce 0.56 grams of iron oxide? 4FeS+7O2->2Fe2O3+4SO2 The molar mass of ferrous sulfide is 87.92 grams and that of iron oxide is 159.7
*June 26, 2013*

**Physics**

An object whose mass is unknown is held by two rigid rods. The whole system is at rest. The angle between the vertical direction and the left rod from point A to B is 60 degrees. The angle between the vertical direction and the right rod from point C to D is 30 degrees. The ...
*June 24, 2013*

**PHYSICS**

Two cars lost in a blinding snowstorm are traveling across a large field, each thinking they are on the road, as shown in the figure on the left. They collide. If the distance x is 150 meters and the red car is travelling at 19.1 mph, how fast to the nearest hundredth of a mph...
*June 6, 2013*

**Physics**

A pinhole camera has a small circular aperture of diameter D. Light from distant objects passes through the aperture into an otherwise dark box, falling on a screen at the other end of the box. The aperture in a pinhole camera has diameter D = 0.600 mm. Two point sources of ...
*June 2, 2013*

**Algebra 2 **

The functions f(θ) and g(θ) are sine functions, where f(0) = g(0) = 0. The amplitude of f(θ) is twice the amplitude of g(θ). The period of f(θ) is one-half the period of g(θ). If g(θ) has a period of 2pi and f (pi/4) = 4, write the function ...
*May 24, 2013*

**Algebra**

Square root 18 + (3/square root 2)
*May 8, 2013*

**Algebra**

Square root 18 + 3/square root 2
*May 7, 2013*

**Math**

Natalie performs a chemistry experiment where she records the temperature of an ongoing reaction. The solution is 93.5º C after 3 minutes; 90º C after 5 minutes, 84.8 C after 9 minutes; 70.2º C after 18 minute; 54.4º C after 30 minutes; 42.5ºC after ...
*May 2, 2013*

**algebra 1**

*I have asked countless people to help me with this story problem and nobody seems to know how to do it! Please help! Natalie performs a chemistry experiment where she records the temperature of an ongoing reaction. The solution is 93.5º C after 3 minutes; 90º C ...
*May 2, 2013*

**algebra 1**

Natalie performs a chemistry experiment where she records the temperature of an ongoing reaction. The solution is 93.5º C after 3 minutes; 90º C after 5 minutes, 84.8 C after 9 minutes; 70.2º C after 18 minute; 54.4º C after 30 minutes; 42.5ºC after 37...
*May 1, 2013*

**Math**

Natalie performs a chemistry experiment where she records the temperature of an ongoing reaction. The solution is 93.5º C after 3 minutes; 90º C after 5 minutes, 84.8 C after 9 minutes; 70.2º C after 18 minute; 54.4º C after 30 minutes; 42.5ºC after 37...
*May 1, 2013*

**Math**

For a seesaw that 14 ft long, where should the fulcrum be placed to balance a 204 lbs adult and a 81.6 lbs child?
*April 24, 2013*

**math**

A 4inch-thick concrete slab is being poured for a circular patio 14 feet in diameter. Concrete costs $55 per cubic yard. Find the cost of the concrete, to the nearest cent.
*April 11, 2013*

**English**

An international agreement that aims to reduce carbon dioxide emissions and the presence of greenhouse gases. Countries that ratify the Kyoto Protocol are assigned maximum carbon emission levels and can participate in carbon credit trading. Emitting more than the assigned ...
*April 8, 2013*

**Algebra**

Matt ate a total of 100 raisins over a five day period. Each day he ate six more raisins than the previous day. How many did he eat the first day?
*March 30, 2013*

**Algebra**

Three ships leave New York for France on the same day. The round trip takes the first ship 12 days, the second ship 16 days and the third ship 20 days. How many days will elapse before all three ships again leave New York on the same day? Assume continuous trip activities for ...
*March 29, 2013*

**statistics**

The average homicide rate for the cities and towns in a state is 10 per 100,000 population with a standard deviation of 2. If the variable is normally distributed, what is the probability that a randomly selected town will have a homicide rate greater than 14?
*March 24, 2013*

**Physical science **

Help Please . Aisha drops an antacid tablet in water and times how long it takes to dissolve. Which of the following will decrease the reaction rate? A.increasing water temperature B.decreasing water temperature C.using more water
*March 22, 2013*

**physical science**

A. increasing water temperature B decreasing water temperature C.using more water
*March 22, 2013*

**physical science **

Help please. Aisha drops an antacid tablet in water and times how long it takes to dissolve. Which of the following will decrease the reaction rate?
*March 22, 2013*

**chemistry**

a 225.0 g sample of an unknown, silver, pure metal was heated to 95.5 degrees celsius then put into 150.50 g of water at 22.5 degrees celsius. the water was heated by the hot metal to a temperature of 31.4 degrees celsius. what is the specific heat? what is the metal?
*March 18, 2013*

**chemistry**

thank you , but what do I substitute the specific heat metal for to find out what it is?
*March 15, 2013*

**chemistry**

a 225.0g sample of an unknown, silver, pure metal was heated to 95.5 degrees Celsius and then put into 150.50g of water at 22.5 degree Celsius. the water was heated by the hot metal to a temp. of 31.4 degree Celsius. what is the specific heat of the metal and what is the metal?
*March 15, 2013*

**chemistry**

what mass of a sample of gold requires 1.75 kJ to change its temperature from 28.2 degrees Celsius to 89.5 degrees Celsius?
*March 15, 2013*

**math**

in a triangle, the measure of the first angle is twice the measure of the second.the measure of a third triangle is 64 degrees more than athe measure of the second angle. Use the facts that the sum of the measures of the three angles of a triangle is 180 degrees to find the ...
*March 13, 2013*

**Math**

What is the value of x x/60 = 1/2/1/6
*March 11, 2013*

**Math**

An architect is drawing a scale model of a new mall. The real mall will be 1800 feet long. The scale the architect is using is 1 inch is equal to 100 feet. How long will the model be?
*March 11, 2013*

**Math**

A ladder has a shadow 3.5 meters long. Marlowe’s shadow is .75 meters long. If Marlowe is 1.5 meters tall, how tall is the ladder?
*March 11, 2013*

**Math**

A pole has a shadow that is 5 feet long. Jackie's shadow is 3 feet long, and she is 6 feet tall. How tall is the pole?
*March 11, 2013*

**Math**

A pole has a shadow that is 5 feet long. Jackie's shadow is 3 feet long, and she is 6 feet tall. How tall is the ladder?
*March 11, 2013*

**Chemistry**

How much heat (kcal)is needed to melt 14 ice cubes? Each cube is at 0c and has a mass of 28grams.
*March 4, 2013*

**trig**

10sinB+5 = sinB+5
*March 1, 2013*

**chemistry**

At 0*C a 1.0-L flask contains 5.0 x 10^-2 mol N2, 1.5 x 10^2 mg O2, and 5.0 x 10^21 molecules of NH3. What is the partial pressure of each gas, and what is the total pressure in the flask?
*March 1, 2013*

**Physics**

a 0.67 kg rubber ball has a speed of 2.2 m/s at point a and kinetic energy 7.1 J at point B find the total work done on the ball as it moves from a to b
*February 27, 2013*

**Physics**

a 0.67 kg rubber ball has a speed of 2.2 m/s at point a and kinetic energy 7.1 J at point B find the total work done on the ball as it moves from a to b
*February 27, 2013*

**Physics**

A current of 4.6 A is measured through a 7.8 ohms resistor for 1.75 minutes. How much heat is generated by the resistor?
*February 26, 2013*

**Physics**

A current of 4.6 A is measured through a 7.8 ohms resistor for 1.75 minutes. How much heat is generated by the resistor?
*February 26, 2013*

**math**

A marathon runner ran the first 5 mi. in 32.5 min. If she continues running at this pace, how long will it take her to run the entire marathon of 26.2 mi?
*February 21, 2013*

**math**

A factory produces bicycles 6 motorcycles in 9 hours. Write a proportion and solve it to find how many hours it takes to produce 16 motorcycles
*February 19, 2013*

**Math**

A basketball star earned $2,000,000 last year. He played in 64 games for an average of 42 minutes per game. Find these rates dollars per game dollars per minute of playing time
*February 14, 2013*

**Math**

Mr. quark drove his car 314 miles in 6.5 hours. He used 12.7 gallons of gas. Find these rates. gallons per mile
*February 14, 2013*

**Math**

Mr. quark drove his car 314 miles in 6.5 hours. He used 12.7 gallons of gas. Find these rates
*February 14, 2013*

**Statistics**

If student A scored 42 on a test of reading and the test had a mean of 52 and a standard deviation of 8, what percentage of test respondents scored below student A?
*February 13, 2013*

**Math page 167 algebra did you hear about...**

-1,-2
*February 5, 2013*

**Biostats **

If the average (xbar) on an assignment in a class was 82% with a standard deviation (s) of 4.8, what is the z-score for someone scoring 75% (round to the one hundredths place or two decimal places)?
*February 3, 2013*

**Physics**

If a 60 kg meteor falls to earth from a great distance. How much gravitational potential energy does it lose? (the energy PE is 0 at a great distance). What happens to this potential energy? Final-Initial=-Gmm/r-0=change in energy
*January 31, 2013*

**Chemistry.**

Thank you so much! The 151 was the wavelength notation.
*January 29, 2013*

**Chemistry.**

An X-ray beam with = 151 incident on the surface of a crystal produced a maximum reflection at an angle of = 28.2. Part A Assuming , calculate the separation between layers of atoms in the crystal. Confused on which formula to use to find this answer.
*January 29, 2013*

**Chemistry**

Four ice cubes at exactly 0 ^\circ {\rm{C}} having a total mass of 55.0g are combined with 110g of water at 77^\circ C in an insulated container. Part A If no heat is lost to the surroundings, what will be the final temperature of the mixture?
*January 22, 2013*

**PRE-ALGEBRA**

An adult house cat could be about 1____ high.
*January 18, 2013*

**intergrated topics/math**

i need help i dont get this problem......
*December 20, 2012*

**intergrated topics/math**

solve for x: 4x(5-6)=10(6x+2)
*December 20, 2012*

**chemistry**

C4H8CLO2 PREDICT THE IR ABSORBANCIES PROTON NMR AND 13C NMR SPECTRAL CHARACTERISTICS FOR THE FOLLOWING MOLECULE. DRAW THE EXPECTED SPECTRA. ALSO PREDICT THE MASS SPECTRUM SHOWING THE MOLECULAR ION AND ANY SIGNIFICANT HIGHER M/Z PEAKS.
*December 18, 2012*

**Grammar**

Identify the abbreviations in this sentence. When they raise me to a high position, then ill get a raise.
*December 5, 2012*

**Physics**

A 50kg box is sitting on your front porch. The coefficient of sliding friction between the box and floor is .4. You are trying to push the box from the porch into the house. What is the force required to push the box at a constant speed?
*December 3, 2012*

**math**

Is the expression a monomial? explain. qs + 5
*November 26, 2012*

**Physics**

An object is placed 8 cm in front of a convex lens of focal length 6 cm. Find the image location by drawing a ray tracing diagram to scale. Verify your answer using the lens equation.
*November 23, 2012*

**precalccc**

find all the real zeros and multiplicity of f(x)=x^4-68x^2+256
*November 19, 2012*

**business andmin admin communication**

thank you so much ms sue. I was able to take the questions we differed on look through the reading material to really get a grasp on the concepts. I was able to resubmit the test (not counted toward grade) just to see if my understanding had improved. i only got 2 wrong that ...
*November 17, 2012*

**business andmin admin communication**

1c 6a 11b 16a 2a 7c 12c 17d 3d 8b 13c 18c 4d 9b 14d 19c 5a 10d 15b 20b These answers got me a 65.. thought i had a firm grasp on the concepts in the chapters... now i want to go back and read over the incorrect questions to get a better understanding
*November 17, 2012*

**business andmin admin communication**

i got a 65, on it. i can post my answers also. i was having a hard time figuring out which questions i got wrong.
*November 17, 2012*

**Algebra/Math**

A total of 504 tickets were sold for the school play. They were either adult tickets or student tickets. The number of student tickets sold was three times the number of adult tickets sold . How many adult tickets were sold?
*November 14, 2012*

**Sociology**

The correct answer is A
*November 11, 2012*

**Chemistry**

51.34 g of water at 81.5 oC is added to a calorimeter that contains 52.13 g of water at 40.7 oC. If the final temperature of the system is 59.4 oC, what is the calorimeter constant (Ccalorimeter) ? Use 4.184 J/goC for the heat capacity of water.
*November 8, 2012*

**Chemistry**

Pentane is a small liquid hydrocarbon, between propane and gasoline in size C5H12. The density of pentane is 0.626g/ml and its enthalpy of combustion is ΔHcomb =-3535kj/mol. Estimate the fuel valve and the fuel density of pentane.
*November 8, 2012*

**Chemistry**

Calculate the final temperature of a mixture of 200.0g of ice initially at -16.5 Celsius and 406.0g of water initially at 84.5 degrees Celsius.
*November 8, 2012*

**Chemistry**

The flame in a torch used to cut metal is produced by burning acetylene(C2H2) in pure oxygen. Assuming the combustion of 1 mole of acetylene releases 1251kj of heat, what mass of acetylene is needed to cut through a piece of steel if the process requires 36.658 x 10^4 kj of heat?
*November 8, 2012*

**Chemistry**

Which of the following gases will effuse through a hole in a balloon fastest? a.Kr b.NO c.N2O d.NO2 e.ArNO2
*November 6, 2012*

**Chemistry**

What is the root-mean-square speed of N2O at 25°C?
*November 6, 2012*

**Chemistry**

The density of an unknown gas is 1.72 g/L at 750.0 torr and 30.0°C. Which of the following could be the unknown gas? a. CS2 b. NO c. N2O d. NH3 e. N02
*November 6, 2012*

**Chemistry**

Which of the following reactions will result in a reduced total pressure? a. CH4(g) + 2O2(g) → CO2(g) + 2H2O(g) c. 2HI(g) → H2(g) + I2(g) b. 2N2O(g) → 2N2(g) + O2(g) d. 2H2(g) + O2(g) → 2H2O()
*November 6, 2012*

**Chemistry**

How many moles of propane are contained in a 5.00 L tank at 450 torr and 25°C?
*November 6, 2012*

**Chemistry**

In an experiment, 25.0 mL of a gas with a pressure of 1.00 atm is contained in a balloon at 25.0°C. The balloon is then cooled to 5.0°C, and the pressure is found to be 0.750 atm. What is the volume of the gas under the new conditions?
*November 6, 2012*

**Chemistry**

Iron(III) oxide reacts with carbon monoxide gas to form solid iron metal and carbon dioxide gas: Fe2O3 + 3 CO --> 2 Fe + 3 CO2 If you begin the reaction with 84.34 g of iron(III) oxide and 68.87 g of CO, which reactant will be in excess at the end of the reaction and how ...
*November 5, 2012*

**Chemistry**

Which one of these samples contains the smallest number of molecules? a. 1.0 L of H2 at STP (0°C and 1atm) d. 1.0 L of N2 at 0°C and 800 torr b. 1.0 L of N2 at STP e. 1.0 L of He at STP c. 1.0 L of H2 at 20°C and 760 torr
*November 4, 2012*

**Chemistry**

Methanol (CH4O) is converted to bromomethane (CH3Br) as follows: CH4O + HBr --> CH3Br + H2O If 12.23 g of bromomethane are produced when 5.00 g of methanol is reacted with excess HBr, what is the percent yield?
*November 4, 2012*

**Childhood Education**

How does poverty relate to a child's risk for inadequate health and well-being?
*November 1, 2012*

**Childhood Education**

What items would you first look for to determine whether lead is present in the environment where children are present?
*November 1, 2012*

**Childhood Education**

Can anyone answer this question? Compare the environment for toddlers with one suitable for infants. How are the areas similar? How are they different?
*October 31, 2012*

**Childhood Education**

Compare the environment for toddlers with one suitable for infants. How are the areas similar? How are they different?
*October 31, 2012*

**Childhood Education**

Compare the environment for toddlers with one suitable for infants. How are the areas similar? How are they different?
*October 31, 2012*

**Organic Chemistry**

An expanded structural formula shows all the atoms of the molecule and all the bonds between the atoms in the molecule. Draw the expanded structural formula for 1,3-dichlorocyclopentane. Draw the structure by placing atoms on the grid and connecting them with bonds. Include ...
*October 30, 2012*

**english-dr.faustus**

the answer was B
*October 22, 2012*

**english-dr.faustus**

the warning Dr.Faustus teaches is? A-the devil is evil B-do not wish for more than heavenly power permits C-the end will justify the means D-both A and C
*October 22, 2012*

**math**

the product of a 1 digit number and a 2-digit number number is 284 what is the awnser
*October 20, 2012*

**Pre-Algerbra**

In which quadrant does the point lie? Write the coordinates of the point. Point B A. quadrant II; (–2, –4) B. quadrant III; (2, 4) C. quadrant III; (–2, –4) D. quadrant IV; (–4, –2)
*October 17, 2012*

**Chemistry/Quantitive Anaylsis**

Determine the absolute and percent relative uncertainty expressing the result in the correct number of significant digits a.) 6.2 (+-0.2)-4.1(+-0.1) b.)[9.23(+-0.03)][4.21(+-0.20}/21.1(+-0.2) c.)log[3.1415(+-0.001)] d) log[(0.104(+-0.0060)]^1/2 /0.0511(+-0.00090]
*October 14, 2012*

**Chemistry/Quantitive Anaylsis**

Before determining the amount of sodium carbonate in a sample by titration with standard hydrochloric avid the anaylst decide to check the procedure by analyzing a known sample of 98.75 (w/w)% purity. Five replicate determinations of the known gave the following results: 98.71...
*October 14, 2012*

**Chemistry**

The amount of energy released by burning a fuel source, measured in energy per mass, is called the fuel value. If all the energy obtained from burning 1.30 pounds of methane (fuel value is 11.97 kcal/g) is used to heat 122.0 kg of water at an initial temperature of 21.1 °C...
*October 11, 2012*

**college stats**

A study wants to examine the relationship between student anxiety for an exam and the number of hours studied. The data is as follows: Student Anxiety Scores Study Hours 5 1 10 6 5 2 11 8 12 5 4 1 3 4 2 6 6 5 1 2 Why is a correlation the most appropriate statistic? What is the...
*October 8, 2012*

**Early childhood education**

Awesome! Thanks!
*October 3, 2012*

**Early childhood education**

Special educational services for young children with disabilities: a. Cannot be enforced through laws. b. depend on parent efforts. c. do not involve the Head Start Program. d. are rooted in federal legislation. I'm thinking D is the correct answer?
*October 3, 2012*

**Exceptional Children**

Most early childhood professionals children’s agree that the terms inclusion and mainstreaming: A. Both refer to exceptional children’s participation in the general education curriculum. B. Mean the same thing. C. Are two different concepts. D. Both refer to programs...
*October 3, 2012*

**English**

I had to write a paragraph about a personal experience of mine with no passive verbs. When I submitted mine my teacher told me it was almost correct but not right yet. Could you tell me a list of passive verbs?
*October 1, 2012*

**Computers**

What are calculations entered into a spreadsheet called? Formulas? Or Values? I'm thinking its formulas but Values talks about calculations on a spreadsheet too.
*September 27, 2012*

**geometry**

PM is the median of trapezoid KLNO. If ON = 24 centimeters and KL = 12 centimeters, which is the length of PM
*September 26, 2012*

**math**

You need to prepare 180g of a 10% cream using 30% stock cream base.how much is needed for each
*September 20, 2012*

**literary**

I need an example of connotation from the Star Wars series in the form of a quote.
*September 16, 2012*

**Bio**

Assume that a cell culture has a density of 108 cells/mL. You transfer 20 microliters (20 L) of this culture onto a microscope slide. How many cells do you expect will be in this 20 L drop you placed under the microscope?
*September 13, 2012*

**geometry**

Given letters gb and gf how do you write a mathematical to compare their measures?
*September 7, 2012*