Tuesday

September 2, 2014

September 2, 2014

Number of results: 55,201

**physics**

Rachel is asked to calculate the density of a liquid. She correctly measures the mass of the liquid to be 13.9 grams, but she incorrectly measures the volume of the liquid to be 8 mL. The actual volume of the liquid is 7 mL. If Rachel uses the following equation to calculate ...
*January 23, 2012 by Anonymous*

**Chemistry**

The LD (subscript 50) for a drug dose that would be fatal for 50% of the population. The LD (subscript 50)for aspirin in rats is 1.75 grams/kilogram of body weight. Calculate how many aspirin tablets a human weighing 155 pounds would have to take to reach this dosage. (1 ...
*January 8, 2012 by Sharon*

**science**

2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
*March 31, 2013 by jeff*

**science**

2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
*March 31, 2013 by jeff*

**science**

2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
*March 31, 2013 by jeff*

**science**

2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
*March 31, 2013 by jeff*

**chemistry**

given the density of helium is 0.1785g/cm3 and the density of argon is 1.784g/cm.3 estimate the density of neon
*October 28, 2012 by Jessa*

**Chemistry**

Ammonium sulfate reacts with a solution of sodium hydroxide to produce sodium sulfate, ammonia gas and water. Calculate the yield in grams of ammonia gas that would form; and the amount of excess reagent in grams that would be left in the flask, after 9.92 grams of ammonium ...
*April 17, 2011 by John*

**chem**

if you were to react 14.00 grams of salicylic acid with 8.50 grams of acetic anhydride, what would your theoretical yield be? the reaction is C7H6O3+C4H6O3--> C9H8O4 + C2H4O2 assuming 1:1 ratio.
*September 1, 2009 by lyne*

**chemistry (molecular calculations)**

If you had 106.35 grams of Cl, how much Na would be required to convert i all to NaCl. I worked this problem and got 41.83 grams of Na, but I'm not sure if this is correct.
*November 13, 2012 by Eliza*

**chemistry**

J. J. Berzelius collected the following data for three reactions: Reaction 1 – 11.56 grams of lead sulfide, PbS, were formed when 10.0 grams of lead reacted with 1.56 grams of sulfur Reaction 2 – 11.56 grams of lead sulfide were formed when 10.0 grams of lead reacted with 3.00...
*October 9, 2013 by Brittney*

**Astro**

Suppose you lived on a planet with the same radius as the Earth, but it had a density 2.99 times Earth's density. Your weight would be different on this planet. Find how much you would weigh on this planet divided by your weight on Earth
*March 27, 2012 by John*

**Physics**

Four point masses are arranged on the xy plane as follows. Mass1 = 47.0 grams at x = 2.00 cm and y = 2.00 cm. Mass2 = 55.0 grams at x = 0.00 cm and y = 4.00 cm. Mass3 = 27.0 grams at x = -3.00 cm and y = -3.00 cm. Mass4 = 45.0 grams at x = -1.00 cm and y = 2.00 cm. What is the...
*November 8, 2013 by JAYZ*

**Statistics**

In an experiment, you measure the popularity of two brands of soft drinks (factor A), and for each brand you test males and females (factor B). The following table shows the main effect and cell means from the study: Factor A Level A1: Level A2: Brand X Brand Y Level B1: 14 23...
*March 10, 2014 by Joy*

**science need help**

2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
*April 1, 2013 by jeff*

**chemistry URGENT...30 min left**

Gasoline is a mixture of hydrocarbons of various chain lengths, ranging from 5-carbon chains to 10-carbon chains. One of the hydrocarbons we often hear about is the 8-carbon chain, octane. Octane combusts with oxygen as given by the balanced equation: 2C8H18(g) + 25O2(g) &#...
*April 22, 2010 by Luda*

**chemistry**

Determine the amount (in grams) of boron that when substitutionally incorporated into of silicon will establish a charge carrier density of carriers/cm .
*April 1, 2013 by adex*

**Chemistry**

I have this problem.... Hexane has a density of 0.659 g/ml. How many milliliters (mL) would a student need to pour in order to get 49.5 g of hexane? Am I to solve by using mass = density x volume? And if so, is the answer 32.62mL?
*September 16, 2012 by Amanda*

**ThermoPhysics**

During the compression stroke of a certain gasoline engine, the pressure increases from 1.00 atm to 20.5 atm. The process is adiabatic and the air–fuel mixture behaves as a diatomic ideal gas. (a) By what factor does the volume change? Vfinal = Vinitial (b) By what factor does...
*May 11, 2013 by CheckingMyAnswers*

**English_ Language of the media**

We had to answer some questions about advertising and choose an ad off TV and out on a magazine to do it on. I did a shampoo ad on TV and a purfume ad in a magazine but i dont get the questions 8 and 9: 8- What are some of the explict values and attitudes assumed to be shared ...
*July 30, 2006 by Stacey*

**math**

13 cents for A 12 cents for B. total protein greater than twelve grams. Total fat less than eight grams. Total grams less than thirty five grams. .5 grams protein and .3 grams fat for A. .6 grams protein and .2 grams fat for B. what is optimal cost
*February 12, 2013 by Jerome*

**math**

The weights of adult long-tongued fruit bats are known to be normally distributed with a mean of 20.22 grams and a standard deviation of 3.23 grams. What is the probability that a randomly selected bat will: a) weigh at most 15 grams? b) weigh less than 30 grams?
*March 21, 2012 by becky*

**Math**

The weights of adult long-tongued fruit bats are known to be normally distributed with a mean of 20.22 grams and a standard deviation of 3.23 grams. What is the probability that a randomly selected bat will: a) weigh at most 15 grams? b) weigh less than 30 grams?
*March 23, 2012 by Becky*

**chemistry**

The body-centered cubic unit cell of a particular crystalline form of silver is 2.2887A on each side. Calculate the density of this form of silver?
*December 10, 2009 by Ericka*

**physics**

a new brand of solar panel generates 500 watts of electrical energy. how much energy would it produce after 24 years."
*October 31, 2012 by Alex Reynolds *

**Math/Chemistry**

We were given an assignment to find a formula for finding the density of water. I wasn't in class when the assignment was given, but the teacher gave the class two values: density H2O at 20 degrees C= .998823 g/mL density H2O at 25 degrees C= .99707 g/mL A friend of mine told ...
*February 8, 2007 by Chris*

**Chemistry**

Can someone please help me with these: 3. Dissolving salt in water is a physical change- False? 'Place the letter of the item in Column II before its best match in Column I' Column 1: 41. Unit of volume 42. unit of mass 43. unit of temperature 44. unit of density 45. .01 of a ...
*October 19, 2010 by mysterychicken*

**Physics**

A medical technician is trying to determine what percentage of a patient's artery is blocked by plaque. To do this, she measures the blood pressure just before the region of blockage and finds that it is 1.20×10^4 Pa, while in the region of blockage it is 1.15×10^4 Pa. ...
*November 12, 2008 by Andrea*

**physics**

The weight of the atmosphere above 1 m^2 of Earth's surface is about 100,000 N. Density, of course, becomes less with altitude. But suppose the density of air were a constant 1.2 kg/m/s^3. Calculate where the top of the atmosphere would be.
*March 28, 2012 by Kristie*

**physics**

The weight of the atmosphere above 1 m^2 of Earth's surface is about 100,000 N. Density, of course, becomes less with altitude. But suppose the density of air were a constant 1.2 kg/m/s^3. Calculate where the top of the atmosphere would be.
*March 29, 2012 by Jim*

**physics**

The weight of the atmosphere above 1 m^2 of Earth's surface is about 100,000 N. Density, of course, becomes less with altitude. But suppose the density of air were a constant 1.2 kg/m/s^3. Calculate where the top of the atmosphere would be.
*March 31, 2012 by C*

**statistics/ Help!-thanks!**

The producers of a new toothpaste claim that it prevents more cavities than other brands of toothpaste. A random sample of 60 people use the new toothpaste for 6 months. The mean number of cavities at their next check up is 1.5. In the general population the mean # of cavities...
*August 25, 2012 by StudentD*

**Geography**

Hey ya'll need a bit of help with a report i have to do on an environmental issue. Basically I need to choose an issue to research which has a two sided argument (something on bird flu or world debt, power stations etc) Really stuck, appreciate any suggestions that I could ...
*August 13, 2006 by Louise*

**chemistry**

When a piece of copper weighing 250 grams is placed n a cup with 450ml of H2O at 21C and the Cp of te cupis 47J/K, how many grams of gasolne would it tae to heat the system to 110C?
*February 16, 2011 by reginajones*

**physiology/ anatomy**

I'm doing a lab about osmosis/ diffusion. We put a 2 molar solution of NaCl into a dialysis bag and submerse the bag in water, weighing the bag after 15 minute increments for an hour. I need help explaining why the weight of the bag would fluctuate (EX. 6 grams -> 7 grams...
*September 7, 2012 by kira*

**Chemistry help!!**

A chemist wants to be a supercook and wants to create 8%(m/v) acetic acud solution to be "extra strength" vinegar. if pure acetic acid Is a liquid density of 1.049 g/ml. how many ml of acetic acid should be dissolved to male 500 ml of 8% acetic acid? It says to first calculate...
*April 22, 2012 by Kate*

**Chemistry**

utomotive air bags inflate when sodium azide, NaN3, rapidly decomposes to its component elements. 2 NaN3(s) → 2 Na(s) + 3 N2(g) (a) How many moles of N2 are produced by the decomposition of 3.50 moles of NaN3? (b) How many grams of NaN3 are required to form 16.0 g of ...
*August 23, 2011 by Bles*

**Density**

Can you identify a metal if you know its density? Explain It depends upon how accurately the density is determined. In some cases, especially where the "unknown" has a density that isn't close to another metal, yes, the density can identify the metal with a high degree of ...
*August 29, 2006 by John*

**Chemistry**

Posted by Angeline on Monday, April 20, 2009 at 5:35pm. A few questions...how many grams are in 48.7x10^24? I don't know how to convert atoms to grams. I can do moles to grams or moles to atoms, but not atoms to grams. My other problem is how do you convert moles to moles as ...
*April 20, 2009 by Angeline*

**chemistry calculation**

I need to know what volume of liquid phosphoric acid at 85%, H3PO4 with density of 1.685 will replace 5 grams of powdered NaH2PO4. H2O. thanks
*June 1, 2013 by sue*

**STATISTICS HELP!!!!!!!**

Statistical Abstracts (117th edition) reports sale price of unleaded gasoline (in cents per gallon) at the refinery. The distribution is mound-shaped with mean μ = 80.04 cents per gallon and standard deviation, σ = 4.74 cents per gallon. (a) Are we likely to get ...
*August 10, 2011 by Amy*

**CHEMISTRY**

HOW MANY GRAMS OF CO2 WOULD BE FORMED FROM 20 GRAMS OF C6H6 IN THE FOLLOWING REACTION? 2 C6H6 + 15O2=12CO2 +6 H2O
*December 27, 2009 by ANGELA*

**Mura**

Could anyone help me with this question...Mecury has a density of 13.6g/cm^3 at 20°C.What would be the density of mecury at 100°C?
*March 15, 2012 by Abraham*

**chemistry honors**

how many grams of a stock solution that is 85% H2SO4 by mass would be needed to make 150 grams of a 45.0 percent solution?
*September 30, 2010 by jimmy*

**chemistry**

Suppose 87.9 grams of FeCl3 reacts with excess aluminum metal to produce 22.3 grams of Fe. What would be the % yield? FeCl3 + Al --> AlCl3 + Fe
*March 26, 2013 by Amy*

**chemistry**

The solubility of KI is 50 g in 100 g of H2O at 20 ?C. If 110 grams of KI are added to 200 grams of H2O, what would happen?
*June 20, 2011 by Glo*

**physics**

This is my problem: A particle with a density of 0.9g/ml is suspended in a solution that has a density of 1.1g/ml. It cannot be sedimented. Using the equation that describes the movement of a particle in a centrifugal field, describe why this is true. The issue I'm having is ...
*February 2, 2013 by Dave*

**Math**

Can someone help me verify if this is correct? Gasoline usage for compact cars in Canada is a normal distribution with a mean of 33.3 km/l and with standard deviation of 7.3 km/L. Round your answers to one decimal place. a) What percentage of compact cars obtains 20km/L or ...
*April 17, 2011 by Jay*

**Math**

Can someone help me verify if this is correct? Gasoline usage for compact cars in Canada is a normal distribution with a mean of 33.3 km/l and with standard deviation of 7.3 km/L. Round your answers to one decimal place. a) What percentage of compact cars obtains 20km/L or ...
*April 17, 2011 by Jay*

**physics**

If a gasoline engine has an efficiency of 21 percent and loses 780 J to the cooling system and exhaust during each cycle, how much work is done by the engine? Is it 3709.5??? Chemical energy in (as fuel and oxygen) = Work out + Heat out 21% is the ratio of Work out to Chemical...
*February 15, 2007 by anonymous*

**4th Grade - Science Fair Project**

Which brand of band-aid sticks best? How does Generic vs. Name brand differ in the way the band-aid sticks? Is one better than the other? Is there a site to help me with this Science Fair Project? Can't find one about Band-Aids????
*November 9, 2010 by John*

**4th Grade - Science Fair Project**

Which brand of band-aid sticks best? How does Generic vs. Name brand differ in the way the band-aid sticks? Is one better than the other? Is there a site to help me with this Science Fair Project? Can't find one about Band-Aids????
*November 9, 2010 by John*

**Chemistry**

The organic compound di-n-butyl phthalate, C16H22O4(l), is sometimes used as a low-density (1.046 g·mL–1) manometer fluid. Compute the pressure (in torr) of a gas that supports a 555-mm column of di-n-butyl phthalate. The density of mercury is 13.53 g·mL–1. Note: For a mercury...
*October 28, 2012 by Garcia*

**Chemistry**

What is the concentration, in w/w%, of a solution prepared from 50.0 grams NaCl and 150.0 grams of water? I think it would be 25.0%, but I'm struggling with these new concentration calculations.
*November 29, 2010 by Ann*

**chemistry/math**

The density of air at ordinary atmospheric pressure and 25°C is 1.19 g/L. What is the mass, in kilograms, of the air in a room that measures 12.0 ft 12.5 ft 7.3 ft? i made ft^3 into Liters and got 8,346,211.799 then I made the grams into kilograms and set up density = mass/...
*August 19, 2012 by Hannah*

**chemistry**

If there are 2.0 grams in 1 meter of copper wire, how many centimeters would be needed to provide .28 grams of copper?
*September 2, 2011 by Julie*

**statistics**

The data below represents the amount of grams of carbohydrates in a sample serving of breakfast cereal. 10 18 24 30 19 22 24 20 18 25 20 22 19 The variance for this data would be __________ grams.
*February 9, 2010 by iyra*

**Chemistry**

A single mole of AgNo3 weighs 169.88 grams. In order to make a 1M solution, how many grams of AgNo3 would need to be dissolved in 5oomL?
*November 2, 2010 by Jazz*

**Chemistry**

how do I write out this problem? How many grams of lithium metal would be produced if 0.500 grams of magnesium was added to a solution of lithium chloride
*November 30, 2010 by Tosha*

**science**

A single mole of AgNO3 weighs 169.88 grams. In order to make a 1M solution, how many grams of AgNO3 would need to be dissolved in 1 liter?
*July 11, 2012 by yoly*

** Chem.. stoichiometry**

How many grams of H2 would be formed if 34 grams of carbon reacted with an unlimited amount of H2O? The reaction is: C + H2O → CO + H2 Is this equation balanced?
*May 3, 2013 by Jenna Woodruff*

**8th grade science**

a 10-liter sample of one type of crude oil has a mass of 8.20kg. What i the density? If this oil spilled on the ocean's surface, would it sink or float? explain answer in terms of density.
*March 24, 2010 by sam*

**Science**

What is the mass of 15mL sample of mercury? Look up the density of mercury. mass = volume x density. Make sure the density is in g/mL. If it isn't you will need to convert it. One place to find density of mercury is at www.webelements.com and click on element #80. I don't ...
*November 16, 2006 by Crystal*

**chemistry**

How many grams of water would you add to 1.00 kg of 1.48 m CH3OH(aq) to reduce the molality to 1.00 m CH3OH. Use two sig figs. I get 4.8 * 10^2 grams and its not right. I want to put this up here again to see if there are any errors that could have possibly been made. (Putting...
*February 21, 2010 by david*

**chemistry**

I can't find a substance apart of water with a pH of 7,so i have a question, i don't know if water is the only neutral substance or if there are more which one's are those? Any salt solution that doesn't hydrolyze in water will be neutral. Any liquid (alcohol, gasoline, etc) ...
*February 4, 2007 by Claudia*

**chemistry**

Thimerosal is an organic compound (gram molecular mass = 404.8 g/mol) used to inhibit bacterial growth. A .100%solution of thimerosal is sometimes used as an antiseptic. Assume that this solution has a density of 1.00 g/mL. A. how many grams of thimerosal are found in .500 g ...
*April 7, 2013 by Tyler*

**chemistry**

how many grams of AgNO3 would need to be dissolved in 1 liter, 500mL, and 100mL in order to make a 1M solution? need to show work and answers are in grams....????
*July 16, 2010 by al*

**chemmmistry**

vitamin c has a density of 1.65 grams per cm^3. what is the volume (in cm^3) of a 500mg tablet of vitamin c ?
*September 27, 2011 by lean- help*

**Gen. Chem 1**

The density of 18% nh4cl is 1.05 grams/ml. What mass of nh4cl is in 425 ml of the solution?
*March 19, 2012 by Zack*

**science**

If wood weights 18 grams with a density of 0.5 what is the volume ans what type of wood is it
*October 17, 2012 by Anonymous*

**Math**

If 241.5 grams of gold has a volume of 12.5 cubic centimeters, what is the density of gold?
*January 8, 2013 by Camma Breezy*

**nursing**

500 grams of sugar occupies a volume of 0.315 L. what is the density of the sugar in g/mL?
*January 17, 2013 by jasmin*

**chemistry**

How many grams of sodium cyanide would be required to make 55 grams of sodium sulfate?
*May 15, 2011 by Sabrina*

**Science**

How many grams of oxygen gas would be needed to react with 75 grams of hydrogen gas
*January 8, 2013 by Tammy*

**Chemistry**

If the density of mercury is 13.6 g/ml, what is the mass of 3.0 liters of mercury in: Grams? Pounds?
*September 13, 2007 by Ayeisha*

**science**

a block of wood 3.0 cm on each side has a mass of 27 grams what is the density of this block thanks
*September 1, 2009 by shearika*

**college**

lead has density of 11.35g/ml,i have 3.45 cc of lead what is the weight in grams.
*August 31, 2010 by mark*

**chem**

An unknown metal has a volume of 5.25 mL and a density 2.71 g/mL. What is the weight of the metal in grams?
*December 4, 2010 by Ivy*

**Chemistry**

What is the volume of 4.00 grams of air if the density of air at the time of the measurement is 1.19 g/l?
*February 6, 2012 by Lisa*

**Science**

A solution has a density of 3/mL. How many grams are needed to obtain 10.0mL of solution?
*September 24, 2012 by Sammi*

**science **

what must be the density of an object with a mass of 5000 grams if the object is to float in water?
*January 25, 2010 by John*

**chemistry**

The mass of one penny is 2.51 grams and its volume is 0.40 cubic centimeter. The density in g/ml of this penny is
*August 31, 2011 by Anonymous*

**chemistry**

100 grams of a liquid completely fill a 200 ml bottle. What is the density of the liquid?
*April 5, 2011 by Joe*

**hw**

concentrated sulfuric acid has a density of 1.84 g/ml. calculate the mass in grams of 1.00 liter of this acid. how to solve this?
*September 22, 2011 by hw help ASAP*

**chemistry**

concentrated sulfuric acid has a density of 1.84 g/ml. calculate the mass in grams of 1.00 liter of this acid.
*September 22, 2011 by ann*

**chemistry**

concentrated sulfuric acid has a density of 1.84 g/ml. calculate the mass in grams of 1.00 liter of this acid.
*September 22, 2011 by victor*

**chemistry thank you**

concentrated sulfuric acid has a density of 1.84 g/ml. calculate the mass in grams of 1.00 liter of this acid
*September 27, 2011 by grace*

**physical sciences**

If 57.9 grams of gold has a volume of 3 cubic centimeters what is the density of gold in g/ cm3,?
*April 26, 2012 by kl*

**Algebra I**

St. Polycarp Catholic Church is having a Turkey, Dressing, and Sausage Dinner fundraiser this weekend. In order to make a profit, at least $1150 in tickets must be sold. Tickets are sold for $6 each. Write the set of numbers, in set-builder notation and using t for tickets, ...
*August 1, 2010 by stephaine *

**PHYSICS**

Lead has a density of 1.13 104 kg/m3 at 0°C. (a) What is the density of lead at 86°C? ___kg/m3 (b) Based on your answer to part (a), now consider a situation in which you plan to invest in a gold bar. Would you be better off buying it on a warm day? Yes or No Explain.
*November 14, 2012 by Sarah*

**Chemistry**

A 10.0 mL volvume of Ultra Bleach is diluted in a volumetric flask. A 25.0 ml sample of this solution is analyzed accordign to the procedure in this experiment. Given that 33.75 mL of 0.135 M Na2S2O3 are needed to reach the stochiometric point, answer the following. a. How ...
*January 24, 2012 by Ashley*

**Chemistry- Drbob-help#3**

I still need help with #3 I'm not sure how I got 1.14M. I have tried to do the problem over, but I not coming up with my original answer of 1.14M. Somehow I am missing a step. Please show work for the 1.14M Thanks Question#9 reads exactly as written. A student makes a solution...
*February 10, 2011 by Paul*

**Chemistry**

I need to work out the density of the gaseous oxide of arsenic at STP in g L-1 I realise density = mass/volume but my answer works out very high!! I have already worked out the volume to be 52cm^3 (Cubed). the mass to start with was 0.702g and at the end of the reaction was 0....
*January 31, 2007 by Annabel*

**general science**

calculate the density of a cork of mass 24g and volume 100 cm3. what would its density be if its volume increases to 200 cm3?
*April 18, 2012 by suevasha*

**Finance 200**

What is the reasons the following types of companies would need a financial forecast: brand new company, family-owned company, and a long-standing corporation?
*December 14, 2009 by Terri*

**Chemistry**

Suppose you tried to combine 42 grams of magnesium with 45 grams of oxygen. Which of the two substances would be left after the reaction? How much magnesium oxide will be formed?
*October 3, 2010 by Chris*

**chemistry**

a mixture of 100 grams of water is mixed with 100 grams of sodium nitrate at 30 degrees celcius if filtered how much salt would be left behind
*June 1, 2013 by Jesica*

**chem**

If 1.2 grams of sodium are reacted with 4.00 mL water, how much NaOH is produced? density of water= 1.00g/mL
*September 21, 2009 by Andy*

**physics**

Find the density of a substance whose mass is 28 grams and whose volume is 4 cubic centimeters
*March 10, 2011 by calis*

**helpppp**

concentrated sulfuric acid has a density of 1.84g/ml. calculate the mass in grams of 1.00 liter of this acid.
*September 20, 2011 by chm helpppp*

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