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August 30, 2014

Search: science, chemestry

Number of results: 24,417

Chemestry
What is the pH? 1.6 x 10^(-5)?
June 19, 2010 by Kate

chemestry
what is the name of BCl3
November 28, 2012 by Anonymous

chemestry
what is limiting reagent ?
February 18, 2013 by shashi ranjan

Chemestry
how to balence an equasion
June 1, 2014 by Barry

chemestry
at what temperature does ice melt
September 17, 2009 by Chad

chemestry
what is the formula for boyles law
January 16, 2010 by izzy

chemestry
sorry its 5-ethyl-2-hexyne
April 28, 2010 by yaimery

chemistry
what is brandy's solution in chemestry?
July 7, 2013 by dorothy

chemestry
what are four components of the water molecule?
October 20, 2008 by Anonymous

chemestry
what is analgesics? what is its composition? what is their utility in curing?
May 5, 2009 by soumya

chemestry
Given 10.0 L of N2 at - 78C. What volume will the N2 occupy at 25C (P is constant)?
April 17, 2011 by Anonymous

chemestry
what is the charge on an ion with 25 protons and 29 electrons?
November 28, 2012 by Anonymous

chemestry
what is the chemical formula for maganese(II)iodine?
November 28, 2012 by Anonymous

Chemestry
How many moles of NaHCO3 are in a 44g sample?
January 28, 2013 by Douglas

chemestry
Which element of group 3A behave as a nonmetal or semimetal?
April 22, 2008 by tomas

chemestry
what is the condensed structural formula for. 5- ethyl-2-hexene
April 28, 2010 by yaimery

Chemestry
HELP!!!!!!A solution made from 19.0 g of Na Br and 500 ml of water has what molarity?
May 4, 2011 by Cindi

chemestry
if my mass of my aluminum cube is 5.45 and volume is 2 ml, what i my density?
September 6, 2011 by ana

Chemestry
What property of paradichlorobenzene may convince you that it is an ingredient in mothballs?
September 29, 2011 by Helena

chemestry
how many total atoms are there in the chemical formula B2(CO3)3
March 5, 2014 by stephanie

chemestry
what does air pressute do to the freezing, melting ad boiling point
September 17, 2009 by Chad

chemestry
what does air pressure do to the freezing, melting ad boiling point
September 17, 2009 by Chad

chemestry
The oxide ion O2- has the same electron configuration as neon?
November 17, 2010 by joly

chemestry
calculate the moles of compound in .540g of ammonium bromide
September 25, 2011 by Help!

chemestry
if you dissolve 350 g of K(2)CrO(4)in 2.4 kg of water, what is the molality of the solution?
April 25, 2013 by crystal

Chemestry
If an ion contains 50 protons,68 neutrons and 48 electrons.what is its symbol?
August 1, 2014 by Elizabeth

chemestry
How many moles of zinc acetate, Zn(CH3COO)2, are there in 163 mL of a 0.160 M solution?
November 17, 2010 by cristy

chemestry
I'm unsure how to figure this question out. "How many moles of Na2CO3 are there in 10.0 L of 2.0 M solution?"
January 18, 2011 by Anonymous

chemestry
calculate the moles of compound in 0.540 grams of ammonium Bromide
September 24, 2011 by Help!

chemestry
Calculate [OH^ - ] for strong base solution: 14.0 mL of 1.2010−2 M Ca(OH)_2 diluted to 430.0 mL.
February 22, 2012 by chris

Chemestry
I got NaOH 7%, its density is 1,08g/ml. Calculate the molar concentration
May 23, 2012 by Martins

Chemestry
Find the molarity of a solution containing 0.75 mol of NaCl with a volume of 1.5 L.
November 23, 2012 by Becky

chemestry
Explain the physical significance of van der waals,parameters ?
February 17, 2013 by shshi ranjan

chemestry
what is the wavelength of the energetic spectral line in the ultraviolet series of the h atom and how to find it
September 14, 2009 by sam

Chemestry
why would it take longer to cook food in the mountians than at sea level?
September 17, 2009 by Chad

chemestry
given 43 moles of KCl how much HNO3 is needed to complet the reaction
December 8, 2010 by juan

Chemestry
I got NaOH, 7%, and its density is 1,08g/mol. Calculate the molar concentration.
May 23, 2012 by Martins

chemestry
how many moles of ammonia contain 1.51 x 10 24power NH3 molecules need help with formula please
April 13, 2010 by leslie

analytical chemestry
100grms lead nitrate+20ml sodium hydroxide+100ml h2o =
December 10, 2011 by joseph

chemestry
show a correct numerical setup for determining how many litters of a 1.2M solution can be prepared with a .50 mole of c6h12o6
January 19, 2011 by edward

chemestry
how is ionizaion energy different from electron affinity? use a chemical equation to clarify your definition.
March 22, 2011 by celina

chemestry
what volume of hydrogen is formed when 3.00g of magnesium react with an excess of dilute sulfuric acid?
March 14, 2012 by skhumbuzo khumalo

chemestry
A 1.00 g sample of naphthalene (C10H8) contains 0.562 g of hydrogen. What is the mass percent of carbon in the compound
September 13, 2013 by camm

chemestry
How many mL of a 0.217 M aqueous solution of ammonium fluoride, NH4F, must be taken to obtain 3.63 grams of the salt?
November 17, 2010 by cristy

CHEMESTRY
C3H8+5O2=3CO2+H2O How many liters of propaine (d=0.585g/ml) will produce 1.25L of water (d=1.00g/mL)?
April 14, 2012 by Anonymous

Chemestry
Express condense order of increasing energy as a string without blank between orbit Barium Element
February 7, 2011 by Meyanna

chemestry
Given the equation C2H4(g)+3O2(g)>2CO2(g)+2H2O(l)+1411kJ, how much heat is released when 8.00g of O2 react?
April 21, 2013 by Haily

Chemestry form two
Balance chemical equations to show the reactions that occur when apice of sodium metal is ex posed to atmosphere
July 13, 2011 by Kevin ochieng

chemestry
true or false the equivalence point is the point at which a neutraliztion reaction has occured
April 7, 2011 by chyanne

chemestry
What is the molecular formula for the folowwing compound? Empirical Formula: C3H6O2 (M=74.08 g/mol)
September 24, 2011 by Help!

chemestry
What is the molecular formula of the following compound? Empirical formula C3H6O2 (M=74.08 g/mol)
September 25, 2011 by Help!

chemestry
what is the final temperature of aluminum when 26.4 cal of heat is added to 18.1 g of aluminum at 21.0 degrees c
September 16, 2012 by bekki

chemestry
Can you show me how to convert/solve this problem? 27 micro grams = ? grams
August 24, 2008 by Lisa

CHEMESTRY- POLARITY
how can you arrange these bonds from most polar to least polar O-C N-N N-O
February 12, 2010 by Anonymous

chemestry
The bonds in SiCl4(l) are srtonger than the bonds in SnCl4(l)? True or false and why? Thank u
November 17, 2010 by joly

chemestry
A 30,000 kg locomotive is moving at a velocity of 10 m/s east. What is the locomotive's momentum?
March 31, 2011 by uhuhuigh

chemestry
what is the molarity of a solution made by dissolving 3.86 moles of NaCl in 2.50 L of solution?
November 22, 2011 by Anonymous

chemestry
if 40 grams of water are produced when 30 grams of ethane is burned what is the % yields
February 14, 2012 by m

Chemestry
the solubility of a gas is 0.34g/L at STP. What is it's solubility at a pressure of 0.80 atm and the same temperature?
March 22, 2010 by David

chemestry
an oilo slick 110 nm 1.0 * 10^6 square meters of ocean.How many liters of oil are in the slick
January 24, 2011 by tom

Chemestry
How many moles of sodium chloride are produced when 25 grams of sodium reacts with chlorine gas?
March 30, 2011 by Me.

kendriya vidyalaya chemestry
the boiling point temperature of liquid _____when it starts boiling
June 16, 2012 by rajarshi

chemestry
How many grams of O2 are needed to produce 45.8 grams of Fe2O3 in the following reaction? 4Fe(s)+3O2(g) - 2Fe2O3(s)
February 27, 2013 by richard

Chemestry
What is the van't Hoff factor for K2SO4 in an aqueous solution that is 5.00 % K2SO4 by mass and freezes at -1.21 ∘C?
January 26, 2014 by Raquel

chemestry
how many grams of dioxygen are required to burn 5.9 grams of C2H5OH?
February 28, 2013 by Anonymous

chemestry
How many grams of CaCl2 would be dissolved in 1.4 L of a 0.11 M solution of CaCl2?
March 11, 2014 by yanely

chemestry
what are the heats of fusion/vaporization & specific heats of nitroglycerin
May 5, 2014 by matt

chemestry
Calculate the heat released (in joules) from the condensation of 25.0 g of ethanol (C2H5OH). ∆Hvap = 204 cal/g; MP = -114.3C , BP = 78.5C (Draw a heating curve first!)
May 26, 2010 by HI!

Chemestry
If 0.25 mol of methane gas (CH4) is introduced into evacuated 2.00 L container at 35 Degrees Celcius , what is the pressure in the container ?
November 17, 2012 by Diana

Chemestry
If 0.25 mol of methane gas (CH4) is introduced into evacuated 2.00 L container at 35 Degrees Celcius , what is the pressure in the container ?
November 17, 2012 by Diana

chemestry 130
6.00 moles H2S*6.02*10^23/1 mole H2S
November 13, 2012 by Anonymous

chemestry
draw the Lewis structure for the following compounds,and predict the molecular shapes. a) water,H2O b)Oxygen gas,O2 c)Ammonia, NH3 d)Ammonium ion,NH4
June 3, 2013 by irfan

chemestry
true or false an atom can emit photons in the visible portion of the electromagnetic spectrum after absorbing photons in the ultraviolet?
November 17, 2010 by joly

Chemestry
If 10 grams of aniline are allowed to react with excess aceticanhydride what is the theoretical yield of acetanilide in moles?grams? please explain
June 2, 2011 by Anonymous

chemestry
nitrous oxide (N2O) is used as an anesthetic. the pressure on 2.50 L of N2O changes from 105 k Pa to 40.5 kPa. If the temperature does not change, what will the new volume
July 18, 2011 by Anonymous

chemestry
The Young's modulus for a material is 11.0 x 1010 N/m2. The material is stretched to a strain of 1.0 x 10-3. How much elastic energy will be expended? (Express your answer in J/m3) unanswered
November 15, 2013 by solid chem

chemestry
Knowing that the energy associated with the formation of 1 mole of vacancies in copper (Cu) is 104 kJ, determine the vacancy density (nv/cm3) in Cu at 1197 K. Assume the pre-exponential factor is one.
November 15, 2013 by Anonymous

Gen Chemestry
How many pounds of carbon dioxide are produced from burning one gallon of gasoline? assume gasoline is 100%, and the density of octane is .78g/ml.
October 25, 2008 by Roth

chemestry
How many molecules of water are present in 3.45 mL of water at 4C?
July 4, 2011 by luis

GENERAL CHEMESTRY
Identify the two important classes of catalysts. Analyze the chemical reactions that take place when a biological catalyst combines with a reactant (substrate) to form an unstable intermediate.
January 13, 2013 by ROSE

solid chemestry
Knowing that the energy associated with the formation of 1 mole of vacancies in copper (Cu) is 104 kJ, determine the vacancy density (nv/cm3) in Cu at 1197 K. Assume the pre-exponential factor is one.
November 17, 2013 by juanpro

chemestry
Consider once again the magnesium nitride addition reaction from the previous question. This time, suppose you start with 10.0 g N2 and an unlimited supply of Mg. What is the maximum number of MOLES of Mg3N2 that could be produced in this case?
November 17, 2010 by cristy

Chemestry
Calculater the amount of heat in kilojoules released when 50 grams of steam at 125 C are converted to 50 grams of ice at -125 C?
October 24, 2008 by Maria

chemestry
What volume will 300 ML of gas at 20 degrees C and a pressure of 335 mm Hg occupy if the temperature is reduced to -80 degrees C and the pressure increased to 760 mm Hg?
December 2, 2011 by laquanda

chemestry
I need serious help on this....please help guys.. i've to turn it in in an hours... Balance th following equation in acid Solutiong and determind if it is spontaneous under standard conditions. NO3^-1 + Sn^+2 ---> NO + Sn^+4 Please do not post duplicates.
May 16, 2007 by bik

chemestry grd 11
indigo C16H10N2O2 (numbers are suppose to b as a subscript) is the common name of the dye that gives blue jeans their characteristic colour. Calculate the mass of oxygenin 25.0g og indigo. show your work.
May 1, 2011 by celina

chemestry
balance the equations (single displacement) 1. zinc + Iron(II) Chlorine ----> 2. Zinc + Hydrogen Chlorine ---->
March 23, 2011 by celina

CHEMESTRY
Which of the following solutions would have the lowest boiling point? A.1.0 M NaCl B.2.0 M NaCl C.3.0 M NaCl D.4.0 M NaCl
November 3, 2011 by SANDRA

chemestry C
how many moles of aluminum oxide can be produce from 12.8 moles of oxigen gas reacting with execess aluminum
November 14, 2011 by lola

Chemestry 095
Complet and balance the following equation. F2 (g) + HCI (g) == ?? Which element or ion is oxidized and which one is reduced? Which one is the oxidizing agent and which is the reducing agent?
November 29, 2009 by Paul

Chemestry
A 1L of buffer was prepared from 0.15 mole of Na2HPO4 and 0.10 moles KH2PO4. a) What is your pH and what is the pH change that adding of 80.0 mL of 0.100 mol L-1 NaOH cause? b) What happen to the pH after adding 10.0 mL of 1.0 mol L HNO3-1.
April 28, 2011 by Margo

chemestry
how do you solve the ideal gas law when you are given the temperature in celcius instead of kelvin. Heres an example question. Calculate the volume occupied by 3.25 moles of carbon dioxide at 25degrees celcius and 750mm Hg.
January 11, 2010 by hellogoodbie

chemestry
1.0000 g of hydrate of stannic chloride with unknown formula is heated to 100C (celsius) for 30 minutes. The remaining anhydrous salt weighted 0.7836g. What is the formula of this hydrate? thanks
September 22, 2011 by anomimo

General Chemestry
Diacetyl, a substance contributing to characteristic flavor and aroma of butter, consist of 55.8% C, 7.03% H, and 37.17% O. In the gaseous state at 100 C and 747 torr, a 0.30 gram sample occupies a volume of 111ml. What is the molacular formula of diacetyl?
October 26, 2008 by Aisha

Chemestry
IF 121ml of a 1.0 M glucose solution is diluted to 500.0 mL, what is the molarity of the diluted solution?
November 5, 2013 by Earl

College Chemestry
an agueous solution of ethlylene glycol (C2H6O2) is 40% ethylene glycol by mass, and has a density of 1.05g/ml. What are the molarity, molality, and mole fraction of the solution? Do you know how to solve this...I am kinda lost..please help
October 26, 2008 by Gary

8th Grade Chemestry
Helping my child study. Are there any online guides that can help me teach how to predict the products of a reaction. i.e. _ Ag(NO3)+ _ CaCl2 yields Really want to be able to teach my child how to do this rather than have the answer. Thanks
January 9, 2011 by Stephen

8th Grade Chemestry
Helping my child study. Are there any online guides that can help me teach how to predict the products of a reaction. i.e. _ Ag(NO3)+ _ CaCl2 yields Really want to be able to teach my child how to do this rather than have the answer. Thanks
January 9, 2011 by Stephen

8th Grade Chemestry
Helping my child study. Are there any online guides that can help me teach how to predict the products of a reaction. i.e. _ Ag(NO3)+ _ CaCl2 yields Really want to be able to teach my child how to do this rather than have the answer. Thanks
January 9, 2011 by Stephen

chemestry
the mass of CuSCN precipitate is 1.379g, what is the mass of copper in the precipitate?
September 29, 2011 by Help please!

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