Saturday

November 28, 2015
Total # Posts: 7,042

**math**

ok, let's make 6 equal to a number over 5. x/5=6. Since 5/5 is equal to one, to get 6 ones over 5, we multiply the numerator of 5 by 6. 5x6=30 so 6 equals 30/5. now let us ADD 1/5 to both sides to make: a/5=31/5 multiply by 5 to cancel out the denominators. we get a=31 so ...
*May 12, 2012*

**CHEMISTRY**

CaC2 (s) + 2 H20 (g) -> Ca(OH)2 (s) + C2H2 (g) The complete reaction of 22.7 g of CaC2 requires consumption of ________g of H2O. I did 22.7 g CaC2* (2/64 mols CaC2) = .709 Right?!?!
*May 12, 2012*

**CHEMISTRY!**

Thankyou!
*May 12, 2012*

**CHEMISTRY!**

Pure copper has a density of 8.933 g/cm^3. What is the volume of a 5 g block of copper? I did D=M/v Flipped the formula to V=M/D V= 5g/8.933 (g/cm^3) so that equals .56 cm^3 Right?!?
*May 12, 2012*

**CHEMISTRY**

Are these listed in the correct order of increasing average molecular speed? NH3<N2<CO2<SO2<Cl2 ???
*May 12, 2012*

**CHEMISTRY**

A Sample of gas originally at 25 degrees C and 1 atm pressure in a 2.5 L container is allowed to expand until the pressure is .85 atm and the temperature is 15 degrees C. What is the final volume of gas? Did anyone get 2.6 L
*May 12, 2012*

**CHEMISTRY**

I must have miss entered something! Thanks.
*May 12, 2012*

**CHEMISTRY**

A Sample of gas originally at 25 degrees C and 1 atm pressure in a 2.5 L container is allowed to expand until the pressure is .85 atm and the temperature is 15 degrees C. What is the final volume of gas? Did anyone get 2.6 L
*May 12, 2012*

**CHEMISTRY**

Is CF4 an example of a central atom with an expanded octet?
*May 12, 2012*

**CHEMISTRY**

I get 61. But after that then what?
*May 12, 2012*

**CHEMISTRY**

Determine the pressure in atm for a 10 g of CO2 sample contained in a sealed 10 L tank at 50degrees C? Did anyone get 26.5 atm?
*May 12, 2012*

**CHEMISTRY**

Thats what I did! THANK YOU!
*May 12, 2012*

**CHEMISTRY**

A mixture of Xe, Kr, and Ar has a total pressure of 6.7 atm. What is the mole fraction of Kr if the partial pressures of XE and Ar are 1.6 atm and 2.8 atm? Did anyone get .343 ?
*May 12, 2012*

**composition(paraphrase this paragraph)**

Much of the gap between the schooling of orphans and non-orphans is explained by the greater tendency of orphans to live with more distant relatives or unrelated caregivers.
*May 11, 2012*

**statistics**

Suppose that 98% of your customers in your market have internet access and you select a random sample of 500 customers. What is the standard error of the proportion of customers who don’t have internet access? I seem to be struggling with no standard deviation listed
*May 10, 2012*

**english**

Please read the following excerpt from an essay, and answer the question that follows. Biologically, adolescence is marked by hormonal changes that produce secondary sexual characteristics. These include breast development in females and beard growth in males. (Psychologically...
*May 10, 2012*

**Statistics**

Compute a one-way ANOVA - Give the source table, test null hypothesis at .05 level. Please explain the steps to solving this. Group 1: 26, 34, 46, 48, 42, 49, 74, 61, 51, 53 EX 1 : 484 Ex 1^2 : 25,024 n = 10 Group 2: 51, 50, 33, 28, 47, 50, 48, 60, 71, 42 EX 2 : 480 EX 2^2 : ...
*May 9, 2012*

**math**

which equation = (1,1)and(0,-1)and (-2,-5) A.y=2x-1 orB.y=x-1 0r C.y=2x+1 or D. y=x+1
*May 9, 2012*

**Chestry**

Yes chemistry
*May 8, 2012*

**Chestry**

If there are 8.8 moles of h2 and co2 in a 500 ml container at equilibrium how many moles of co and h2o would be present?
*May 8, 2012*

**english**

i have to do an english presentaion for my grade 12 class about a book that i was assigned, how can i involve the class in my presentation?, the book i had to read is called "fall on your knees"
*May 8, 2012*

**math**

oh didnt see the the last sentence
*May 7, 2012*

**math**

7 hours
*May 7, 2012*

**math**

A telephone pole casts a shadow 16 feet long at the same time that a man 6 feet tall casts a shadow of 2.4 feet. How tall is the pole?
*May 7, 2012*

**Algebra**

120 meters of fencing is used to fence 3 sides of a dog park against an existing wall. if the width of the park is w, find the length of the field in terms of w
*May 6, 2012*

**physics**

during a process, 21.6 MJ of heat is added to closed system. if the internal energy is increased by 59.6 MJ, how much work in Btu was done? is the work done on ro by the system?
*May 5, 2012*

**algebra 2**

by gruoping...!!
*May 5, 2012*

**phi 103**

I brought a pair of shoes from that store that immediately fell apart. their shoes are no good. Does this falls under Begging the question fallacy?
*May 5, 2012*

**Chemistry!!**

1) Write balanced chemical equation for the oxidation of Fe^2+(aq) by S2O6^2-(aq)? 2)Write balanced chemical equation for the oxidation of Fe^2+ by N2O 3)Write balanced chemical equation for the oxidation of Fe^2+ by VO2+
*May 4, 2012*

**math**

Solve this system using elimination. If a single solution exists, write the solution as an ordered pair. Your answer will be an ordered pair, no solution, or infinitely many solutions 3a+5b=-19 5a-27b=145
*May 3, 2012*

**English II - Animal Farm**

My assignment is to find the human vice that each of the seven commandments intended to prevent in the novel, Animal Farm. First, I do not know what human vice the following two are supposed to prevent: Whatever goes upon two legs is an enemy. Whatever goes upon four legs, or ...
*May 3, 2012*

**math**

how long will $600K last, assuming it earns 6% a year with a withdrawl of 4% annually and inflation rate of 2%
*May 2, 2012*

**math**

Name the point of intersection for the following system, if it exists. Your answer will be an ordered pair, no solution, or infinitely many solutions. 4x-3y=-3 3x-y=-6
*May 2, 2012*

**PHYSICS**

a uniform stick weighing 50Newton is suspended from the ceiling while the other end of it rests on the floor and making an angle 60degree along with horizontal. the string makes a 15 degree angle with the vertical. find the minimum value of the coefficient of static friction ...
*May 1, 2012*

**physics**

a person 0f mass m = 60 kg walks along the radius from the periphery to the center of a circular platform of moment of inertia= 200kgm square and radius r = 3m. the disk is a rotating frictionless with angular velocity= 0.3 rad\s.find the angular velocity of the system when ...
*May 1, 2012*

**Chem**

If 20.0 L of a gas is cooled from 373 K to 273K, what is the new volume?
*April 30, 2012*

**english**

hey I'm a 9th grader and my english teacher give me a summative homework about rumors. He need us to write a problem that happen in school and also want us to answer or solve the problem about rumors.. I need help with it because I know nothing about rumors..
*April 30, 2012*

**math**

Name the point of intersection for the following system, if it exists. 4x – 3y = -3 3x – y = -6
*April 30, 2012*

**@elena**

nvm, i did it wrong. i already got the answer its 79% thanks
*April 29, 2012*

**@elena**

thank you so much help with the problem. i have trouble solving part b of the problem you helped me with. it told me to give it as a percentage, I got 10% but it is wrong. can you please help me Superman must stop a 190-km/h train in 180m to keep it from hitting a stalled car ...
*April 29, 2012*

**college physics**

i got it its 79% i was label some of the numbers with the wrong variables. tahnks and will keep that in mind
*April 29, 2012*

**@elena Question !**

for part b, what would be the percentage. i got 10% but it isnt right
*April 29, 2012*

**college physics**

Superman must stop a 190-km/h train in 180m to keep it from hitting a stalled car on the tracks. part a)If the train's mass is 3.8×10^5kg , how much force must he exert (find the magnitude)? part b)Compare to the weight of the train (give as %). partc) How much force...
*April 29, 2012*

**uniben**

do it urself
*April 29, 2012*

**math**

expand as a binomial series (r-p)^9
*April 28, 2012*

**math**

An exam consists of two parts, Section X and Section Y. There can be a maximum of 80 questions. There must be at least 20 more questions in Section Y than in Section X. Write a system of inequalities to model the number of questions in each of the two sections. Then solve the ...
*April 28, 2012*

**math**

When a person is swinging the amplitude (the swings"s distance above it's rest position) increases with each pump. According to Scientific magazine the amplitude increases by adding a constant when the person pumps sitting down, and by multiplying by a constant when ...
*April 27, 2012*

**chemistry**

(ppm and ppb are sooo not easy for me to get)c A saturated solution of PbCO3 contains 0.00011 g PbCO3 in 100. g of water. What is this concentration in parts per million?
*April 26, 2012*

**chemistry**

Most community water supplies have 0.50 ppm of chlorine added for purification. What mass of chlorine must be added to 134.0 L of water to achieve this level? anwser grams
*April 26, 2012*

**chemistry**

A sample of water is analyzed and found to contain 18.6 ppb of arsenic. If a person were to drink 2.0 L of this water per day for 1.4 years, what is the maximum amount of arsenic they could accumulate in their body? Assume that 1 year = 365 days anwser________ grams or arsenic
*April 26, 2012*

**biology **

1,Why do autotrophs always occupy the lowest level of ecological pyramids? 2.Explain how the growth of one population can bring about the disappearance of another population during succession? 3. Describe some common plants and animals from a tropical rain forest and a ...
*April 26, 2012*

**chemistry**

4NH3(g)+5O2(g) yield 4NO(g)+6H2O(g) Deduce the equilibrium constant expression for the reaction.
*April 26, 2012*

**Physics Please someone help please**

A 30 g glass thermometer reads 21.6°C before it is placed in 135 mL of water. When the water and thermometer come to equilibrium, the thermometer reads 38.1°C. What was the original temperature of the water? Please provide step by step equation and answer
*April 26, 2012*

**Physics Please someone help please**

A 30 g glass thermometer reads 21.6°C before it is placed in 135 mL of water. When the water and thermometer come to equilibrium, the thermometer reads 38.1°C. What was the original temperature of the water? Please provide step by step equation and answer
*April 26, 2012*

**Chemistry**

A 2.7 M solution of phosphoric acid (H3PO4) is to be reacted with a 7.5 M solution of sodium hydroxide to make sodium phosphate and water. How many L of the H3PO4 solution will react with 0.662 L of the NaOH solution
*April 25, 2012*

**life orintation**

8 ways in which the environment impacts communities
*April 24, 2012*

**Mechanics problem - Newtons laws - resultant force**

I have this mechanics problem. Please help me solve it. Rory, Aurora and Raoul are three lions fi ghting over a piece of meat of mass 12 kg. Each lion exerts a horizontal pull. Rory pulls with a force of 800 N. Aurora, who is 120degrees to Rory's right, exerts a force of ...
*April 24, 2012*

**l.o**

identify and describe one environmental proble that causes ill health,accidents,crises,and disasters within your community or any other community within south africa or globally
*April 23, 2012*

**calculis**

Find the equation of the tangent line to the curve y=e^2x + 4x at the point (0,1)
*April 23, 2012*

**calculus**

Find the equation of the tangent line to the curve y=e^2x + 4x at the point (0,1)
*April 23, 2012*

**math**

a cubical container is half filled with water if the volume of water in the container is 500cm3 find the length of one edge of container?
*April 23, 2012*

**math**

a rectangular tank has the measurement 60cm wide and 2000cm2 water flows into the tank at the rate of 8 liters per minutes how long will it take to fill the tank?
*April 23, 2012*

**math**

a rectangular swimming pool is 30m wide and 50m long if the 600m of water is added to the pool what is the increase in the height of the water level in centimeters?
*April 23, 2012*

**math**

A rectangular box is 16cm long and 10cm wide 960 1-cm cubes can fit into the box exactly what is the height of the box?
*April 23, 2012*

**Physics**

Anyone else from SF have to google this question, or was i the only one?
*April 22, 2012*

**pre-calc helpppp**

Find sin x/2, cos x/2, and tan x/2 from the given information. (show work please) thank you!!! cos x = − 4/5, 180° < x < 270°
*April 21, 2012*

**pre-calc helpppp**

thank you so much!!!!
*April 21, 2012*

**pre-calc helpppp**

Simplify the expression by using a Double-Angle Formula or a Half-Angle Formula. ã((1-cos50)/2)
*April 21, 2012*

**pre-calc helpppp**

Thank you!!!!
*April 21, 2012*

**pre-calc helpppp**

Evaluate the expression under the given conditions (show steps please) sin(è/2); tan è = − 5 / 12 , è in Quadrant IV
*April 21, 2012*

**Chemistry!! Help**

Consider the following equilibrium: N2O4 <=> 2NO2 You may assume that delta H and delta S do not vary with temperature. At what temperature will an equilibrium mixture of 1 atm total pressure contain twice as much NO2 as N2O4?
*April 20, 2012*

**Chemistry!!!**

Consider the rxn during the Haber Process: N2 + 3H2 ---> 2NH3 The equilibrium constant is 3.9 x 10^(5) at 300 K and 1.2 x 10^(-1) at 500 K. Find Delta H reaction and Delta S for reaction
*April 20, 2012*

**MATH##$$&&^^****

4.16%
*April 20, 2012*

**Physics**

Thanks Elena your a life saver :)
*April 20, 2012*

**Physics**

A cube of ice is taken from the freezer at -8.8°C and placed in a 103 g aluminum calorimeter filled with 321 g of water at room temperature of 20°C. The final situation is observed to be all water at 15°C. What was the mass of the ice cube? Could someone please ...
*April 20, 2012*

**math**

6/8
*April 19, 2012*

**math**

The water in fish tank has evaporated so it was 5/8 inch below the level it should be they added water and the water level went up 3/4 inch did the water level end up above or below where it should be
*April 19, 2012*

**science**

Which of the following scales use the concept of absolute zero? I. C II. F III. K IV. R
*April 18, 2012*

**science**

Thermal energy is different from temperature because thermal energy depends on the _____.
*April 18, 2012*

**science**

A trash can is rolling down the street at 5 m/s. If the trash can has a mass of 23 kg, what is its momentum?
*April 18, 2012*

**chem**

Brandon throws a flying disc with a force of 8 N. If the disc has an acceleration of 4 m/s2, what is the mass of the disc?
*April 18, 2012*

**science**

Brandon throws a flying disc with a force of 8 N. If the disc has an acceleration of 4 m/s2, what is the mass of the disc?
*April 18, 2012*

**english**

thank you and for this one: Meredith is to be restored as captain.the infinitive is to be and is a noun?
*April 17, 2012*

**english**

so it is to use and it would be a adverb
*April 17, 2012*

**english**

okay and the second one is i have permission and its a adverb?
*April 17, 2012*

**english**

okay and the answer can only be a noun.adverb or adjective.
*April 17, 2012*

**english**

i have one more question what is the function of the italicized infinitive phrase ins the sentence. 1.I want to go with you to the store. 2.May I have permission to use the car tonight?
*April 17, 2012*

**english**

thank you ms.sue
*April 17, 2012*

**english**

what is the gerund phrase and the noun function of the gerund in the sentence 1.Her favorite pastime is entertaining friends.
*April 17, 2012*

**Math**

A math teacher is randomly distributing 15 rulers with centimeter labels and 10 rulers without centimeter labels. What is the probability that the first ruler she hands out will have centimeter labels and the second ruler will not have labels.
*April 16, 2012*

**physics- help please !!1**

A toy rocket moving vertically upward passes by a 2.2m -high window whose sill is 7.0m above the ground. The rocket takes 0.17s to travel the 2.2m height of the window part a) what was the launch speed of the rocker ? assume the propellant is burned very quickly at blastoff ...
*April 16, 2012*

**physics**

15.5
*April 15, 2012*

**Chemistry 1201**

Thanks so much!
*April 15, 2012*

**Chemistry 1201**

Butane, C4H10, is a component of natural gas that is used as fuel for cigarette lighters. The balanced equation of the complete combustion of butane is 2C4H10(g)+13O(g)-> 8CO2(g)+10H2O(l) At 1.00 atm and 23C , what is the volume of carbon dioxide formed by the combustion of...
*April 15, 2012*

**Chemistry 1201**

Butane, C4H10, is a component of natural gas that is used as fuel for cigarette lighters. The balanced equation of the complete combustion of butane is 2C4H10(g)+13O(g)-> 8CO2(g)+10H2O(l) At 1.00 atm and 23C , what is the volume of carbon dioxide formed by the combustion of...
*April 15, 2012*

**Chemistry 1201**

When heated, calcium carbonate decomposes to yield calcium oxide and carbon dioxide gas via the reaction CaCO3(s)->CaO(s)+CO2(g) What is the mass of calcium carbonate needed to produce 53 L of carbon dioxide at STP?
*April 15, 2012*

**Pre-Calc Help!!!!!!!!!!!!!!!!1**

can someone help me please????
*April 15, 2012*

**Calc Help!!!!!!!!!!!!!!!!1**

tan(sin^-1(5/6)-cos^-1(1/5)
*April 15, 2012*

**Math**

Try 868
*April 15, 2012*

**physics**

An athlete thtrew a short put of mass7.52kg through a distance of 24m when we projected a short put at angle of 30. Assuming there is no air resistance, what is the initial kinetic energy of the athlete.
*April 15, 2012*