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chem
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What would happen to the metals if iron nails were used to secure sheets of copper to a roof?
3 answers
asked by
ashley
905 views
given the mass of the original sample and the mass of the solid chloride produced, how do you calculate the mass of the matal in
1 answer
asked by
ashley
344 views
An aspirin tablet weighing 0.650 g has been analyzed and contains 68.2 % ASA (180.16 g/mol) by mass. A student dissolved
the
3 answers
asked by
Un
623 views
Which reaction has been chosen as the 'standard' against which every other reaction is measured?
A. Li+ + e– --> Li B. F2 +
3 answers
asked by
Matt
373 views
a) why should you use moles in stoichimetric problems?
b) solid reacts violently with water, producing heat, hydrogen gas, and
4 answers
asked by
john
447 views
An aspirin tablet weighing 0.650 g has been analyzed and contains 68.2 % ASA (180.16 g/mol) by mass. A student dissolved
the
3 answers
asked by
un
565 views
help, i'd like to know how to do this titration question:
for example: a 1g sample of naoh contaminated with na2co3 is titrated
3 answers
asked by
Alex
457 views
How many mL of stomach acid (assume it is .035 M HCI) can be neutralized by an antacid tablet containing .231g
Mg(OH)2?
4 answers
asked by
natash
2,860 views
another calorimetry experiment is performed in which a 500. gram peice of gray metal at 67 degrees celsius is added to 493 grams
6 answers
asked by
miley
474 views
How does the osmotic pressure of an aqueous solution change as evaporation occurs?
2 answers
asked by
Ginger
1,259 views
How many different possible tetrachlorobenzens exist?
1 answer
asked by
Ginger
310 views
Balance the equation:
Note: If a chemical species coefficient is "1" then "1" needs to be entered in the field before that
4 answers
asked by
UN
401 views
Balance the equation:
Note: If a chemical species coefficient is "1" then "1" needs to be entered in the field before that
5 answers
asked by
UN
367 views
a flask containing 155cm^3 of hydrogen was collected under a pressure of 22.5 kPa. what pressure would have been required for
4 answers
asked by
jerson
616 views
how do you determine the theoretical yield?
1 answer
asked by
Kayla
415 views
The total pressure in a flask containing air and ethanol at 257C is 800 mm Hg. If the pressure of the air in the flask is 762 mm
3 answers
asked by
Anonymous
388 views
A gas has pressure of 4.62 atm when its volume is 2.33 L if the temperature remains constant, what will the pressure be when the
2 answers
asked by
jerson
538 views
For the gaseous equilibrium represented below, it is observed that greater amounts of PCl3 and Cl2 are produced as the
3 answers
asked by
Luke
1,395 views
what is the theoretical yield for the balanced equation Ti+2F2= TiF4 if the mass is 0.227 Ti, 0.296 F2?
1 answer
asked by
laurie
442 views
draw the lewis structure for NO2- including any valid resonance structures. which of the following statements are true?
a. the
4 answers
asked by
natash
10,869 views
choose the compound below that contains at least one polar covalent bond, but is nonpolar
a. ICl3 b SeBr4 c. CF4 d. HCN Im stuck
4 answers
asked by
natash
10,482 views
why does the solubility of ytterbium sulfate decrease with temperature?
1 answer
asked by
Anonymous
342 views
determine the solubility of each of the following grams of solute per 100. g H2O
a) NaNO3 at 10°C b) KNO3 at 60°C c) NaCL at
3 answers
asked by
jerson
1,680 views
Is dimethyl ether a polar molecule?
between dimethyl ether and ethyl alcohol, which molecule is expected to be more soluble in
4 answers
asked by
natash
1,949 views
how do you calculate the number of millilliters of 1 M required for an amount of moles?
and how would i find out what remains in
3 answers
asked by
Kayla
446 views
A 4.55L sample of water contains .115g of sodium ions. Determine the concentration of sodium ions in ppm if the density of the
4 answers
asked by
natash
6,068 views
What functional group(s) must be present in a monomer of a condensation reaction.
1 answer
asked by
12mr5
481 views
which of the following substances should have the highest melting point?
Xe F2 SrS MgO CO2 the answers D, is it because its an
4 answers
asked by
natash
5,857 views
In the reaction of calcium metal and water, 50.0 mL of hydrogen gas is collected over water at 25.0 degrees C with a total
3 answers
asked by
natash
1,049 views
determine the oxidation number of
MgBR2(s) and NH4No3(s)
2 answers
asked by
ama
656 views
write the balanced half-reaction for the conversion of Fe(s)to Fe+2(aq)
1 answer
asked by
ama
409 views
Calculate the mole fraction of total ions in an aqueous solution prepared by dissolving .400 moles of MgCl2 in 850.0g of water.
m
3 answers
asked by
natash
3,822 views
assign oxidation numbers to
PF-6(aq)
2 answers
asked by
amethyst
482 views
how would you figure this out?
if 500 mL of hydrogen are colected over water at 20 degrees c and 745 torr, what will the volume
2 answers
asked by
Kayla
724 views
how many orbital orientations are possible in each of the s, p, d, and f sublevels?
b) how does 2s orbital differ from a 1s
3 answers
asked by
jerson
1,184 views
based on the balanced eq: c6h12+9O2->6CO2+6H2O
calculate the molecules of CO2 formed when 174 molecules of H20 form. im not
4 answers
asked by
rudy
1,437 views
of cesium, Cs, hafnium, Hf, and gold, Au, which element has the smallest atomic radius? explain in terms of trends in periodic
3 answers
asked by
jerson
1,815 views
what is the common name for ethane and propene?
I think propene is propylene but i don't know about ethane.
5 answers
asked by
Sarah H
612 views
how many grams of zinc oxide are needed to produce 12 mol of zinc?
1 answer
asked by
Anonymous
385 views
how would i figure out this question?
assume that 5.60 L of H2 at STP reacts with CuO according to the equation: CuO+H2 yields
3 answers
asked by
Alicia
1,563 views
Given the length of Mg in cm and the mass per meter of Mg, how do i find the mass?
1 answer
asked by
Kayla
364 views
if the length of Mg is 2.7 cm and the mass per meter of Mg is .981 how do i find the mass of the Mg?
2 answers
asked by
Kayla
1,059 views
how do you solve for the combined gas law?..i ..I am very confused ..someone help by making it easier and clear since i am kinda
5 answers
asked by
amie
571 views
how do you convert grams to moles
3 answers
asked by
amie
491 views
can u help me write a word equation for the electrolysis of water , and indicate physical states and conditions of the reaction
4 answers
asked by
juan
1,115 views
convert a pressure 1.75atm to kpa
convert the pressure of 1.75atm to mm Hg convert a pressure of 570 torr to atmospheres
2 answers
asked by
amie
792 views
2NO(g) + O2(g) = 2NO2
If there are .02 moles of O2, .04 moles of NO, and .96 moles of 2NO2, calculate Kp if the total pressure is
2 answers
asked by
tina
538 views
The burning of 18.0 g of carbon produces 55.0 g of carbon dioxide. What is the
theoretical yield of CO2? Calculate the percent
3 answers
asked by
Anonymous
2,333 views
Calculate the percent yield of Cl2(g) in the electrolytic decomposition of
hydrogen chloride if 25.8 g of HCl produces 13.6 g of
3 answers
asked by
Anonymous
1,467 views
What is the actual amount of magnesium oxide produced when excess carbon
dioxide reacts with 42.8 g of magnesium metal? The
3 answers
asked by
Anonymous
2,007 views
ionic compounds are composed of
1 answer
asked by
josh
328 views
what changes in atomic number and mass number occur in a positron emmision of radioactive decay?
1 answer
asked by
jerson
367 views
how would you set this problem up?
An unknown gas effusees at .850 times the effusion rate of nitrogen dioxide, NO2. Estimate the
2 answers
asked by
Kayla
638 views
what are 3 types of gene munitions?
1 answer
asked by
Anonymous
312 views
okay so i have the answers but i just wanted to see if i was correct
Balance these equations..i need the correct answers
1 answer
asked by
amie
417 views
why is it necessary to heat the oxalic acid solution before titrating it with the potassium permanganate solution
3 answers
asked by
mAddee
1,882 views
What do question about Aluminum, hand this is some general question about it can someone help me to answer them
Why is it wise to
2 answers
asked by
Josh
568 views
How does the mammalian heart control blood flow to different parts of the body?
2 answers
asked by
jenni
545 views
Which of the following is NOT true of colligative properties? Colligative properties are...
A. responsible for lowering the vapor
3 answers
asked by
sonia
522 views
The molarity and the molality of a solution prepared by dissolving 2.00 g of ethanol C2H5OH with 100.0 g of water to give a
1 answer
asked by
so
464 views
i was reading a safety guide book and it asked one of the following questions.
Which of the following safety precautions is
2 answers
asked by
so
531 views
In the reaction of hydrogen peroxide with iron (II) ion in acidic solution to form iron (III) ion and water,
the oxidizing agent
2 answers
asked by
Blair
500 views
How many electrons are transferred in the reaction of hydrogen peroxide with iron (II) ion in
acidic solution to form iron (III)
2 answers
asked by
Anonymous
556 views
A solution is made by mixing 20.0 mL of toluene C6H5CH3d=0867gmL with 150.0 mL of benzene C6H6d=0874gmL. Assuming that the
1 answer
asked by
Chem help
476 views
Balance the equation: MnO4¡V + H+ + Fe2+ Mn2+ + H2O + Fe3
1 answer
asked by
Anonymous
426 views
Wich of the following is NOT true about the blank for the experiment, 'Analysis of a Complex Iron Salt'?
A. The volume required
4 answers
asked by
Anonymous
593 views
In your own words, describe how you would calculate the concentration of green pigment. Assume that your 1/100 solution had an
2 answers
asked by
Linda
499 views
what type of bond are nitrogen and carbon atoms mostly like to form with other bonds.
3 answers
asked by
Adam
585 views
The diameter of a neutral argon atom is about 2.0 multiplied by 102 pm. Suppose that we could line up argon atoms side by side
4 answers
asked by
jamie
1,497 views
How many oxygen atoms are in 1.90g og quartz (SiO2)?
ok so 1.90g SiO2(1mol/60.0843g SiO2)(2 O mols/1 mol SiO2)
4 answers
asked by
Natash
2,155 views
If 17.0g of MgSO4*7H2O is thoroughly heated,what mass of anhydrous magnesium sulfate will remain ?
I don't even know where to
3 answers
asked by
Natash
1,257 views
Assuming the volumes are additive, what is the [Cl-]solution obtained by mixing 210mL of 0.600M KCl and 630ml of 0.385M MgCl2 ?
R
7 answers
asked by
jay
906 views
The American Dental Association recommends that an adult female should consume 3.0mg of flouride per day to prevent tooth decay.
3 answers
asked by
natash
882 views
Imagine that you have a 7.00L gas tank and a 4.50L gas tank. You need to fill one tank with oxygen and the other with acetylene
3 answers
asked by
hannah
901 views
if hydrogen and helium were to mix, what would be the product(chemical formula)
1 answer
asked by
mike
351 views
Ca(H2PO4)2 and NaHCO3 are ingredients of baking powder which react with each other to produce CO2, thereby causing dough or
2 answers
asked by
fru
1,140 views
Explain the fact that acetic acid can be extracted quantitatively from ether solution by dilute aqueous sodium hydroxide
4 answers
asked by
Omar
778 views
I want to know why indium and oxygen form In2O3, where does the 3 come from ?
1 answer
asked by
natash
344 views
Helium-oxygen mixtures are used by divers to avoid the bends and are used in medicine to treat some respiratory ailments. What
3 answers
asked by
tomi
745 views
i am trying to find the minimum volume of hot water needed to dissolve 100 mg of salicylic acid.
when i did the calculations i
3 answers
asked by
tom
772 views
For the reaction shown, find the limiting reactant for each of the following initial amounts of reactants.
4Al(s)+3O2
3 answers
asked by
natash
4,980 views
How many CO2 molecules would be formed from the reaction mixture that produces the greatest amount of products?
2CH3OH(g)+3O2(g)-
2 answers
asked by
natash
1,072 views
How many CO2 molecules would be formed from the reaction mixture that produces the greatest amount of products?
2CH3OH(g)+3O2(g)-
4 answers
asked by
natash
1,698 views
Joe Student created a calibration curve. When determining the unknown concentration of the same chemical, he found the
1 answer
asked by
samia
399 views
what is a lighted wooden splinter?
1 answer
asked by
Anonymous
278 views
The combustion of hydrogen–oxygen mixtures is used to produce very high temperatures (approximately 2500 °C) needed for
4 answers
asked by
tomi
2,506 views
A hemoglobin molecule (molar mass =65000 g) can bind up to 4 oxygen molecules. In a certain experiment a .085-L solutoin
1 answer
asked by
Mischa
960 views
A student in 51LA conducts a melting point experiment with an unknown
compound and observes a melting range of 122 – 129 °C.
4 answers
asked by
Jason
537 views
Calculate the standard enthalpy change for the reaction
2A+B->2C+D Use the following data: Substance A=-257kj/mol B=-413kj/mol
4 answers
asked by
tomi
2,399 views
The complete combustion of butane, (g) is represented by the equation
C4H10+ 13/2O2->4CO2+5H2O standard enthalpy is -2877kj How
3 answers
asked by
tomi
2,000 views
The complete combustion of butane, (g) is represented by the equation
C4H10+13/2O2->4CO2+5H20 STANDARD ENTHALPY IS -2877KJ/MOL
3 answers
asked by
tomi
1,587 views
A calorimeter contains 16.0ml of water at 15.0degrees celsius. When 1.60g of X(a substance with a molar mass of 46.0g/mol) is
2 answers
asked by
tomi
947 views
our task is to determine which liquid is which, two blue solutions and two clear
choices: CUSO4 CU(NO3)2 NH4OH CaCl2 how do i do
1 answer
asked by
giznelbell
400 views
One mole of an ideal gas is sealed in a 22.4- container at a pressure of 1 and a temperature of 273 . The temperature is then
6 answers
asked by
Anonymous
1,662 views
Use the molar volume of a gas at STP to determine the volume (in L) occupied by 10.5g of neon at STP.
5 answers
asked by
nikki
651 views
The air in a bicycle tire is bubbled through water and collected at 25 C. If the total volume of gas collected is 5.65 L at a
3 answers
asked by
nikki
927 views
i am trying to find the minimum volume of hot water needed to dissolve 100 mg of salicylic acid.
when i did the calculations i
2 answers
asked by
nancy
770 views
i am trying to find the minimum volume of hot water needed to dissolve 100 mg of salicylic acid.
when i did the calculations i
1 answer
asked by
nancy
505 views
Explain why ethanol and acetone are not suitable solvents for extracting
organic compounds from aqueous solutions. does it have
2 answers
asked by
Jason
577 views
what are some of the factors that affect melting point besides, impurities, pressure, and having a wet solution?
4 answers
asked by
Jason
337 views
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