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A ground state hydrogen atom absorbs a photon of light having a wavelength of 93.03 nm. It then gives off a photon having the
4 answers
asked by
brett
3,679 views
A sample of carbon,3.0g, was burned to carbon dioxide in a copper calorimeter.The mass of the calorimeter was 1.5kg and the mass
4 answers
asked by
afar
1,208 views
A student dissolved 10.5 g of NH4Cl in 40 mL of water. The temperature of the water changed from 22.5oC to 5.1oC. Calculate the
4 answers
asked by
anaa
924 views
Q: Calculate ℰ° values for the following cells. Which reactions are spontaneous as written (under standard conditions)?
5 answers
asked by
.
5,137 views
Assume you heat 30 g of water until it all turns into gas. At standard conditions, what volume will this water occupy?
Answer in
4 answers
asked by
Big Boy
1,080 views
Performing a saponification on a triacylglycerol generates soap. options:
true false More information is needed. Depends on the
4 answers
asked by
cv
925 views
Use the reaction, which produces ammonia, to answer the question.
N2(g) + 3H2(g) ⇄ 2NH3(g) Which change would happen in the
16 answers
asked by
bill nye the science guy
5,453 views
How many isomers of C2H3Br3 are possible? explain.
12 answers
asked by
natash
3,803 views
The solubility product of Mg(OH)2 is 1.2 x 10^-11. What minimum OH- concentration must be attained (for example, by adding NaOH)
5 answers
asked by
Mischa
2,157 views
The crystal structure of lithium sulfide (Li2S) is pictured here. (Intro 1 figure) The edge length of the unit cell is
7 answers
asked by
Dr Bob plz help
6,330 views
Methyl violet is an indicator that changes color over a range from pH=0 to pH=1.6. What is the Ka of methyl violet?
7 answers
asked by
che,
4,950 views
write the balanced half reaction for the reaction of Al3+ to Al
(3+ is the oxidation state) i don't understand... wouldn't you
4 answers
asked by
Anonymous
3,327 views
Calculate the pH of 0.20 M NaCN solution.
NaCN ---> Na+ + CN- CN- + H20+ ---> HCN+ + OH- Initial conc. of CN- = 0.20 mol/L change
5 answers
asked by
Lena
4,944 views
Say I have 50 mL of bromocresol green indicator. This solution has 80mg/L. the molar mass is 698 g/mol.
Then say I took 10 mL of
3 answers
asked by
Anonymous
674 views
The concentration (M) of HCl in a solution prepared by dissolving 5.5 g of HCl in 200 g of C2H6O
is ?????? M. The density of the
4 answers
asked by
benju
3,571 views
A 120.0 mL buffer solution is 0.105 M in NH3 and 0.135 M in NH4Br, What mass of HCl could this buffer neutralize before the pH
5 answers
asked by
moe
3,647 views
standard free energy change of -11.70 kJ mol-1. Calculate equilibrium constant for 25 degrees C.
I got 7.772..and it's wrong I
3 answers
asked by
Yoo
383 views
25.0 mL of 0.125 M silver nitrate are mixed with 35.0mL of 0.100 M sodium sulfate to give solid silver sulfate. Write the net
4 answers
asked by
Lori
779 views
Calculate the pH after 0.12 mol of NaOH is added to 1.00 L of 0.60 M HF and 1.06 M KF
4 answers
asked by
michele
1,065 views
methyl salicylate has a mass percent composition of 63.2% C, 31.6% O, and 5.26% H.The mass of one molecule of the compound is
3 answers
asked by
pop
2,401 views
When the valve between the 2.00-L bulb, in which the gas pressure is 2.00 atm, and the 3.00-L bulb, in which the gas pressure is
4 answers
asked by
ana
7,077 views
The fact that ice is less dense than water is related to the fact that ____.
the molecular structure of ice is much less orderly
4 answers
asked by
Lexi
4,617 views
Determine the mass of 7.79 ×1023 atoms Cl.
Answer in units of g
3 answers
asked by
luke
733 views
Calculate the pH of a solution in which
a. [H3O+] = 7.8 x 10-7 M b. [H3O+] = 5.1 x 10-6 M c. [H3O+] = 6.1 x 10-5 M d. [H3O+] =
4 answers
asked by
chelsey
901 views
what mass of zinc will be required to react completely with 100cm3 of a 1.0M hcl.
4 answers
asked by
sonia
1,111 views
What is reaction equation of sodium thiosulphate and potassium iodate when standardized? I have seen many different equations
5 answers
asked by
Anonymous
3,943 views
Cracking is a random process. The alkane C14H30 might split in a variety of different ways. Write
equations for the cracking of
3 answers
asked by
Hao
439 views
If the reaction 2HgO --> 2Hg + O2 is endothermic, which bonds are the strongest?
The bonds between Hg atoms in the solid metal.
4 answers
asked by
bill nye the science guy
628 views
If the levels of mercury are the same in both sides of a u-tube, what must be true of the gas in the manometer
i said: The gases
4 answers
asked by
mic
906 views
Hi,
I need help with this problem--- I have no idea how to go about it
4 answers
asked by
manny
2,106 views
how do you write the equilibrium expression for: C3H8 + SO2-><- 3CO2 + 4H2O?
7 answers
asked by
madison
3,594 views
What volume will 1.216 g of SO2 occupy at 18 degrees celcius and 755 torr?
5 answers
asked by
bob
1,614 views
In the trigonal bipyramidal geometry, which position- axial or equatorial- do nonbonding electrons prefer? why?
I know its
4 answers
asked by
natash
2,927 views
a gas volume has of v1=450ml. if the temp is held constant, what volume would gas occupy if the pressure p2=2p1?
omg i cant
4 answers
asked by
amie
884 views
A 25.0 g aluminum block is warmed to 65.2 C and plunged into an insulated beaker containing 55.3g of water initially at 22.0C.
5 answers
asked by
natash
2,557 views
find the volume of a cube of zinc with the following dimensions:3.000 cm , 3.1 cm, 2.99 cm
can someone help me set this up it's
4 answers
asked by
melissa
876 views
which of the following could be used to dissolve a carboxylic acid into the aqueous phase?
a)MgSO4 b)1.5 M HCl c)1.0 M NaHCO3
4 answers
asked by
Jason
637 views
how do you prepare a solution using the proper lab equipment(both from dry solid and a stock solution)
i researched it but all i
4 answers
asked by
lyne
725 views
If 50.0 mL of a 0.10M solution of sodium chloride is mixed with 50.0 mL of 0.10 M magnesium chloride, what is the molar
4 answers
asked by
Amanda
2,604 views
What volume of 0.200 M H2SO4 will be needed to neutralize 50mL of 0.178 N NaOH?
i don't even know how to start
5 answers
asked by
samuel
1,994 views
A 250 mL sample of oxygen is collected over water at 25 degrees Celcius and 760.0 torr pressure. What is the pressure of the dry
4 answers
asked by
joey
4,146 views
what happens when a seed crystal is placed into a saturated solution?
3 answers
asked by
jill
805 views
Write a chemical equation for Sr(OH)_2(aq) showing how it is a base according to the Arrhenius definition.
I came up with
4 answers
asked by
moe
2,779 views
A lead fishing weight with a mass of 57 g absorbs 146 cal of heat.If its initial temperature is 48^C, what is its final
4 answers
asked by
Anonymous
2,080 views
the total pressure of n2o4 and no2 IS 1.38 atm. if kp is 6.75(25 C) calculate partial pressure of NO2 in the mixture. 2NO2<--->
6 answers
asked by
anon
1,058 views
what is the molality of a solution of 50.0 grams of propanol in 152 mL water if the density of wate is 1.0 g/mL and the density
4 answers
asked by
paula
3,323 views
) Which of the following should dissolve the smallest amount of silver sulfide per liter, assuming no complex formation? A) 0.1
4 answers
asked by
sana
2,264 views
The volume of an adult's stomach ranges from about 50 mL when empty to 1 L when full.If its volume is 500 mL and its contents
5 answers
asked by
Anonymous
2,591 views
Give the conjugate base of the following Bronsted-Lowry acids. (Type your answer using the format CO2 for CO2, [H2AsO4]- for
3 answers
asked by
Rebekah
2,280 views
At a certain temperature, the reaction
CO(g) + 2H2(g) <===> CH3OH(g) has Kc = 0.500. If a reaction mixture at equilibrium
4 answers
asked by
chris
3,267 views
How many moles of chloroethylene contain 5.47X10^26 molecules
4 answers
asked by
mimi
4,863 views
Cobalt-60 is a strong gamma emitter that has a half-life of 5.26 yr. The cobalt-60 in a radiotherapy unit must be replaced when
4 answers
asked by
hannah
3,252 views
I am pretty confused on this.
1. Pick the appropriate solvent to dissolve A) Sodium Chloride (ionic) B) Sodium Nitrate (ionic)
7 answers
asked by
michelle
7,878 views
Write the complete ionic equation for Cu(NO3(aq)+K2S(aq)and namd write the formula for the spectator ions in this reaction? This
5 answers
asked by
Amanda
7,510 views
What weight of potassium bromide, KBr, could be recovered by evaporating 650.0 g of 15.0 percent KBr solution to dryness?
4 answers
asked by
byke
1,346 views
What will be the percent composition by weight of a solution made by dissolving 12.0 g of zinc nitrate, Zn(NO3)2, in 45.0 g of
3 answers
asked by
byke
1,211 views
the max # of grams of K that can be obtained from 100.grams of KHCO3?
3 answers
asked by
mary
1,013 views
what will happen to bromothymol blue indicator:
a.) after addition of HCl, how does it affects the equilibrium b.) after addition
4 answers
asked by
kacey12
2,215 views
For the reaction I2(g) + Br2(g) 2 IBr(g), Kc = 280. at 150.°C. Suppose that 0.570 mol IBr in a 2.50-L flask is allowed to reach
7 answers
asked by
Hannah
917 views
at 84 degrees Celsius , a gas in a container exerts a pressure of 0.503 ATM. assuming the size of the container remains the
3 answers
asked by
natalee
1,651 views
Calculate the pH at the equivalence point in titrating 0.100 M solutions of each of the following with 0.080 M NaOH.
chlorous
4 answers
asked by
hannah
1,535 views
Given an aqueous solution in which the [H+] = 2.5EE-7 M, what is the molar hydroxide ion concentration
3 answers
asked by
kris
1,110 views
Assume that you have 1.41mol of H2 and 3.50mol of N2. How many grams of ammonia (NH3) can you make, and how many grams of which
4 answers
asked by
sue
2,957 views
A ground state hydrogen atom absorbs a photon of light having a wavelength of 92.30 nm. It then gives off a photon having a
6 answers
asked by
Anonymous
24,861 views
18.1g of ammonia and 90.4g of copper(II) oxide are used in the reaction 2NH3+3CuO=N2+3Cu+3H3O.What is the limiting reactant? How
3 answers
asked by
fredrick
2,368 views
An experimental chamber has a volume of 60 L. How many moles of oxygen gas will be required to fill the chamber at STP?
4 answers
asked by
iNeedHelp
1,284 views
A sample of hydrogen with a volume of 800 mL exerts a pressure of 620 mm Hg at 5°C.
Approximately what volume will it occupy at
4 answers
asked by
t
1,101 views
what is the balanced equation for aqueous zinc chloride and aqueous sodium chromate?
Is it, ZnCl2+NaCrO4-->ZnCrO4+NaCl2 and how
4 answers
asked by
mona
4,288 views
Carbon dioxide gas has a Henry's law constant of 4.48×10-5 M/mmHg at 25.0 °C when dissolving in water. If the total pressure
3 answers
asked by
james
1,518 views
An impure sample of (COOH)2 ·2 H2O that
has a mass of 3.4 g was dissolved in water and titrated with standard NaOH solution. The
4 answers
asked by
lois
2,729 views
What will be the result of a reaction if its enthalpy change is positive, its entropy change is negative and Gibbs free energy
4 answers
asked by
Laura
1,204 views
A graph of experimental data is a straight line when ln[H2] is plotted versus time. Which rate law fits the data?
A. Rate =
4 answers
asked by
jameson
1,816 views
In an experiment a mixture of oxygen and nitrogen gas is collected over water at 30'c and 700 torr pressure. What is the partial
4 answers
asked by
adar
781 views
Which description correctly compares sucrose (C12H22O11) to table salt (NaCl)?
A) Table salt will melt at a much lower
4 answers
asked by
haley
1,689 views
How do the components of a conjugate acid–base
pair differ from one another? Give an example of a conjugate acid–base pair to
4 answers
asked by
Big Boy
892 views
(1) MgCO3(s) ⟶ MgO(s) + CO2(g) ΔrH = 118.1 kJ mol−1
(2) Mg(s) + 12O2(g) ⟶ MgO(s) ΔfH =−601.7 kJ mol−1 What is the
5 answers
asked by
jhope
2,063 views
Write the chemical formula for mercury(I) iodate
3 answers
asked by
aj
477 views
Based on the half-reactions and their respective standard reduction potentials below, what is the standard cell potential for
5 answers
asked by
anna
1,549 views
1. An organic compound with a formula mass of 417 g/mol was
analyzed for ethoxyl (CH3CH2O—) groups by the reactions ROCH2CH3 +
4 answers
asked by
Mae Ann Siao
717 views
For the reaction: 2 N2O5 (g) → 4 NO2 (g) + O2 (g)
Later during the reaction, the rate of consumption of N2O5 was determined to
4 answers
asked by
tuffy123
918 views
Which statement best explains what would happen if a reactant were added to a system in equilibrium?(1 point)
The system would
10 answers
asked by
bill nye the science guy
5,255 views
Predict whether aqueous solutions of the following salts are acidic, basic, or neutral, and
write an equation for the reaction of
3 answers
asked by
pei
165 views
one atom of silicon can properly be combined in a compound with
A. one atom of chlorine B. two atoms of oxygen C. three atoms of
1 answer
asked by
alf
1,086 views
λ for one line of the hydrogen spectrum is .4118 x 10-4 cm. Use this value in the Rydberg equation to calculate the RH value
2 answers
asked by
Mary
1,014 views
Consider the decomposition of ammonium hydrogen sulfide:
NH4Hs(s) <--> NH3(g) + H2S(g) In a sealed flask at 25*C are 10.0 g
3 answers
asked by
Chris
1,996 views
Help with this one please?
If you place a piece of blue litmus paper in 200mL of dilute hydrochloric acid, the litmus paper turns
3 answers
asked by
Horacio
1,134 views
A blood sample contains several different types of cells, each of which contains different combinations of specific ions and
4 answers
asked by
K
1,743 views
How can separate 1L samples of O2 and H2 have the same average velocity/
3 answers
asked by
mel
527 views
The specific heat capacity of silver is 0.24 J/°C·g.
(a) Calculate the energy required to raise the temperature of 140.0 g Ag
7 answers
asked by
mel
2,310 views
calculate the max wavelength of light capable of removing an electron for a hydrogen atom from the energy state characterized by
3 answers
asked by
mel
2,700 views
What is the pH of a solution prepared by diluting 25.00mL of 0.020M barium hydroxide to a volume of 100.00mL?
4 answers
asked by
Ginger
1,786 views
what kind of e-pair geometry, molecular geometry, and bond angles does C4H10 exhibit? I'm confused.
4 answers
asked by
natash
1,757 views
HOw much energy is required to heat 36.0g H2O from a liquid at 65C to a gas at 115C? The following physical data may be uselful.
3 answers
asked by
natash
3,332 views
what is the value of the acid dissociation constant for a weak acid?
how come the answer is less than one (1)?
3 answers
asked by
fsdfafdsaf
436 views
How many moles of water can be made from 4 moles of oxygen gas and
16 moles of hydrogen gas? What is the limiting reagent?
2 answers
asked by
Anonymous
664 views
in the ground state electron configuration of Fe3+, how many unpaired electrons are present? I thought it was 1, but im getting
4 answers
asked by
natash
6,513 views
why do we add boiling chips or boiling stones before the distillation starts? Boiling chips should never be added to a hot
3 answers
asked by
Jason
4,253 views
A student carried out a simple distillastion on a compound known to boil at 124 C and reported an observed boiling point of
4 answers
asked by
Jason
2,302 views
(R)-(+)- limonene has a boiling point of 176 C. What made it possible to steam distill it at 100C?
- is it because you could have
4 answers
asked by
Jason
1,545 views
You're asked to prepare 125mL of .0321 M AgNO3. How many grams would you need of a smaple known to be 99.81% AgNO3 by mass?
4 answers
asked by
Anonymous
2,100 views
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