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Chemistry
Page 19
Questions (96,661)
What are the steps to solve this problem? "The enthalpies of combustion of glucose and ethanol are -2813kj/mol and -1369kj/mol,
3 answers
asked by
Julie
1,014 views
Molecular, ionic, and net ionic equations for ammonium chloride + potassium sulfate. Also what is the observation.
Is it 2NH2Cl +
3 answers
asked by
Tyler
989 views
Methane is formed in landfills by the action of certain bacteria on buried organic matter. If a sample of methane collected from
3 answers
asked by
Luke
1,190 views
In a fume cupboard molten lead(ii) bromide is electrolysed using graphite electrodes. Write half-equations for the reaction at
3 answers
asked by
Jeconiah
1,190 views
In the presence of an alkali, Cl2 reacts to form Cl- and ClO3- , as follows:
3 Cl2(g) + 6 OH−(aq) → 5 Cl−(aq) + ClO3−(aq)
5 answers
asked by
anabel
1,956 views
Consider the following reaction:
2H2S (g) + 3O2 (g) --> 2SO2 (g) + 2H2O (g) If O2 was the excess reagent, 1.3 moles of H2S were
4 answers
asked by
:(
2,312 views
a cell is constructed by immersing a strip of silver in .10 M AgNO3 solution and a strip of lead in 1.0 M Pb(NO3)2 solution. A
4 answers
asked by
audrey
2,919 views
calculate the mass of the water of hydration if a hydrate loses 0.025 mol of H2O when heated
3 answers
asked by
Sherry
1,584 views
A 0.285 M solution of the sodium salt, NaA, of the weak monoprotic acid, HA, has a pH of 9.65. Calculate Ka for the acid HA.
I
4 answers
asked by
Blair
1,313 views
I'm stuck on this one problem in Chemistry:
A student measures the mass of an object as 2.32 grams and its volume as 34.56mL. The
2 answers
asked by
Chervonna
708 views
Which observation most likely indicates that only a chemical change has taken place?(1 point)
The change cannot be reversed.
7 answers
asked by
Lettuce?
154 views
The Ksp of PbI2 is 8.73 × 10-9. Find the solubility of PbI2 in M
Please guide me , the I C E table still confuses me, please
3 answers
asked by
jordan
653 views
416g of an anhydrous Bacl2 were obtained when 488g of hydrated salt were heated.calculate x in the formula:Bacl2.xH2O
4 answers
asked by
Faith
742 views
If a sample contains 50g of carbon 14 and 50g of nitrogen 14 , how many lives has it undergone ?
2 answers
asked by
Don
655 views
What mass of water is needed to completely react a 8.1 g packet of magnesium
3 answers
asked by
Dina
532 views
What is the solubility of silver chromate in pure water
3 answers
asked by
Joe
1,426 views
Which procedure could be used to demonstrate that matter is conserved during a chemical change or reaction?(1 point)
Responses
7 answers
asked by
pickles
88 views
calculate the percent yield of Cl2 in the electrolytic decomposition of hydrogen chloride if 25 g of HCl produces 13.6 of
5 answers
asked by
Anonymous
5,814 views
From the following:
pure water solution of C12H22O11 (m=0.01) in water solution of NaCl (m=0.01) in water solution of CaCl2
5 answers
asked by
Sal
5,399 views
A manufacturer of soft-drinks advertises that their orange soda as "naturally flavored," although it contains only 5% orange
3 answers
asked by
Barry
2,329 views
A 0,518 g sample of limestone was dissolved and then the calcium was precipitated as calcium oxalate ( CaC2O4). Afer filtrating
3 answers
asked by
Heydie
1,622 views
Calculate the cell potentials for the following voltaic cells:
2Al (s) + 3Cu 2+ (aq) → 2Al 3+ (aq) + 3Cu (s) 3Mg (s) + 2Al 3+
2 answers
asked by
Jazzy
591 views
According to collision theory, which of these is not required for particles to react?
the particles must react with sufficient
1 answer
asked anonymously
52 views
Which statement about this atom is FALSE?Use the Periodic Table to help you. (1 point)ResponsesThe atoms has an overall charge
1 answer
asked by
dee
38 views
Imagine a graph. The x-axis is labeled "Time" and is measured in seconds, and the y-axis is labeled "Potential Energy" and is
1 answer
asked anonymously
36 views
There are 3 unknown substances A, B, and C that need to be classified as element, mixture or compound.. Substance A can be
1 answer
asked by
hi :)
30 views
What about Kevlar makes it so strong? (1 point)
O The molecules stack together in crystal-like structures. O Kevlar is made with
1 answer
asked anonymously
20 views
Identify if the system typeis Open or Closed
A. A system in a closed container. B. If matter can be added in the form of
1 answer
asked anonymously
25 views
A 400-g sample of water contains 4.50 x 10-5 g of arsenic. Calculate the concentration of arsenic in the water sample in in
1 answer
asked anonymously
12 views
1. Ethanoic acid (acetic acid) is very soluble in water. However, naturally ocurring long-chain carboxylic acids such as
2 answers
asked by
anonymous
589 views
Identify the species oxidized and the species reduced in each of these redox equations, and give the oxidation numbers of each
1 answer
asked by
zayed t
367 views
1) How do I prepare 2M nitric acid from 65% concentrated nitric acid?
2) How do I prepare 17% ammonia from 25% concentrated
7 answers
asked by
candy
9,217 views
Use the equation below and determine what volume of O2 at STP is needed to react with 1.5 moles of C2H4?
Balanced equation: C2H4
7 answers
asked by
Casey
4,000 views
on chemical scale, the relative mass of the isotopic mixture of x atoms (x^20,x^21,x^22) is approximately equal to:(x^20 has 99
6 answers
asked by
veer
2,426 views
what is the pH of a solution prepared by adding 0.50 mol KOH to 1.0 L of 0.30 M HNO3?
5 answers
asked by
jj re
2,681 views
MnS(s) + 2 H+ --> Mn2+ + H2S(g)
At 25 C the solubility product constant, Ksp, for MnS is 5 x 10-15 and the acid dissociation
5 answers
asked by
AL
5,145 views
What is the Ksp of PbCl2 if, in a saturated solution of this salt, [Cl-(aq)] = 0.032 mol/L ?
4 answers
asked by
Steve
1,882 views
calculate the number of atoms in 50 dm3 nitrogen gas
6 answers
asked by
ndalama
4,474 views
The number of grams in three moles of solid ammonium chlride, NH4Cl(s) is
A. 50.47 g b. 53.50 g c. 103 g d. 160 g
5 answers
asked by
Blaeonk
1,139 views
A 0.4550g solid mixture containing CaSO4 dissolved in water and treated with an excess of Ba(NO3)2, resulting in precipitation
5 answers
asked by
JACI WINLOW
4,114 views
What is the reduction potential for the half-reaction Al3+(aq) + 3e- Al(s) at 25°C if [Al3+] = 0.10 M and E° = –1.66 V?
5 answers
asked by
ibbi
5,546 views
What mass of ethylene glycol C2H6O2, the main component of antifreeze, must be added to 10.0 L water to produce a solution for
13 answers
asked by
Saira
5,916 views
What is the molar concentration of a solution obtained by dissolving 560cm3 of hydrogen chloride gas measured at s.t.p in
4 answers
asked anonymously
197 views
A dilute salt solution containing 6% salt is fed to an evaporator at rate of 10000 kg/h for a trail run. crystals formed along
4 answers
asked by
Patel bhavya
1,408 views
What is the oxidation number of sulfur (s) in NaHSO3?
I know that Na is 1 but I do not know what else to do. Please explain,
6 answers
asked by
Hannah
8,599 views
Hydrocarbons A and B both contain 85.7 % carbon. Their molar masses are 42 and 84 respectively.
a) Which elements does a
6 answers
asked by
Amir
3,276 views
What is the approximate pH of a solution labeled 6 x 10^-5 M HBr?
7 answers
asked by
jahil
6,469 views
compare and contrast the variety of amino acids with that of monosaccharides and fatty acids. Which group exhibits the greatest
5 answers
asked by
paul
6,139 views
What mass of NaCl do you need to make 71g of Cl2?
4 answers
asked by
savannah
2,321 views
(a) What is the pH of a 2.0 molar solution of acetic acid. Ka of acetic acid = 1.8 x 10¯5
(b) A buffer solution is prepared by
7 answers
asked by
Dave
3,194 views
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