The equilibrium constant for the reaction Fe3+(aq) + SCN-(aq) <=> FeSCN2+(aq) is 68.7.
Applying Beer- Lambert lawApplying the Beer-Lambert law, which relates the absorbance of a solution to its concentration and the path length of the sample cell. The law is given by the equation:
A = εbc
In this case, we are given the absorbance (A = 1.0138) and the calibration curve (A = 7250.1*[FeSCN2+]), so we can solve for the concentration of FeSCN2+:
1.0138 = 7250.1*[FeSCN2+]
[FeSCN2+] = 1.398×10^-4 M
Next, we need to determine the initial concentrations of Fe3+ and SCN- before they react. Since both solutions have the same volume and concentration, we can assume that they have the same initial concentration of Fe3+ and SCN-:
[Fe3+]i = [SCN-]i
= 0.00200 M
After the reaction, some of the Fe3+ and SCN- will react to form FeSCN2+. Let x be the concentration of FeSCN2+ formed at equilibrium. The equilibrium concentrations of Fe3+ and SCN- are given by:
[Fe3+]eq = [Fe3+]i - x
[SCN-]eq = [SCN-]i - x
The total volume of the solution after the reaction is 10.00 mL, so the concentrations of Fe(NO3)3 and NaSCN are diluted by a factor of 10/5 = 2. We need to account for this dilution in our calculations. The diluted concentrations are:
[Fe3+]dil = 0.00200 M / 2 = 0.00100 M
[SCN-]dil = 0.00200 M / 2 = 0.00100 M
Substituting the equilibrium concentrations and the molar absorptivity into the Beer-Lambert law, we get:
A = εbc
1.0138 = (7250.1 cm^-1 M^-1) * (0.1 cm) * x
Solving for x,
x = 1.398×10^-5 M
The equilibrium constant, Kc, is given by:
Kc = [FeSCN2+]/([Fe3+]eq[SCN-]eq)
Substituting the equilibrium concentrations and the value of x, we get:
Kc = (1.398×10^-4 M) / ((0.00200 M - 1.398×10^-5 M)(0.00200 M - 1.398×10^-5 M))
Kc = 68.7
Therefore, the equilibrium constant for the reaction Fe3+(aq) + SCN-(aq) <=> FeSCN2+(aq) is 68.7.
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Elements and compounds are usually more dense in their solid than in their
liquid state. However, water is one of the notable exceptions. The density
of ice is 0.917 g/mL, while the density of liquid water is 1.00 g/mL. What
natural phenomena does this explain?
Explanation:
The molecules in water is more tightly packed than in ice, so water has greater density than ice.
Does hydrogen have similar physical properties to alkali metals?
Answer:
YESExplanation:
because it contain 1 electron in its outermost shellConsider the data [X] [Y] [Z] initial rate M M M M · s −1 Exp 1 0.30 0.20 0.35 0.210 Exp 2 0.60 0.10 0.70 0.420 Exp 3 0.60 0.20 0.70 0.420 Exp 4 0.60 0.40 0.35 0.105 What is a correct rate law for the reaction?
Answer:
Rate = k [X]⁻¹ [Z]²
Explanation:
[X] [Y] [Z] initial rate M M M M · s −1
Exp 1 0.30 0.20 0.35 0.210
Exp 2 0.60 0.10 0.70 0.420
Exp 3 0.60 0.20 0.70 0.420
Exp 4 0.60 0.40 0.35 0.105
In Experiment 2 and 3 where the concentrations of Y and Z were constant, doubling the concentration of Y had no effect on the rate of the reaction. This means, that the rate of the reaction is zero order with respect to Y.
In experiment 3 and 4, dividing the concentration of Z by 2, causes the rate of the reaction to decrease by 4. This means the rate of the reaction is second order with respect to Z.
In experiment 1 and 4, doubling the concentration of X, causes the rate of the reaction to decrease by half. This means that X has an order of -1 with respect to the rate of the reaction.
The rate expression is given as;
Rate = k [X]⁻¹[Y]⁰[Z]²
Rate = k [X]⁻¹ [Z]²
what is the defination of epsom salt?
MARK ME BRAINLIST
How many carbon (C) atoms are in CaCO3?
Answer:one atom
Explanation:
The carbon symbol is C so only one
Calcium has 1 atom
Oxygen has 3 atoms
Answer:
Only one Carbon atom
Explanation:
CaCO3 is composed of one atom of Calcium, one atom of Carbon and three atoms of oxygen
When elements are arranged according to increasing atomic number, there is a repeating, regular pattern of properties
This is called
periodic law
group
periodic table
family
Answer:
grpup
Explanation:
napagaralan namin yan
Which of the following statements is the best example of an interaction between the atmosphere and the hydrosphere ? Done rnnnn
Which of the following is considered a dilute solution? Choose all that apply.
Very sweet tea
Contact lens solution
Tide pods (laundry detergent)
Swimming pool water
Answer:
Very sweet tea
Explanation:
yeah... because sweet tea can cause tooth decay in our mouth thats why...(Please check the other answers also...Its all my point of view....thank you)
How many valence electrons does Oxygen have:
a) 3
b) 5
c) 13
Answer:
it has 6?
Explanation:
The answer should be 6
6. El oxígeno gaseoso se calienta a presión constate de 50 °C a 300 K. Se conoce que inicialmente el volumen del sistema era de 1,3 litros. ¿Cuál es el volumen final del sistema?
Answer:
El volumen final del sistema es 1.2L
Explanation:
La ley de Charles establece que el incremento de la temperatura de un gas produce un incremento en el volumen directamente proporcional cuando la presión permanece constante. La ecuación es:
V₁/T₁ = V₂/T₂
Donde V es volumen y T temperatura absoluta de un gas en 1, el estado inicial y 2, su estado final.
Reemplazando:
V₁ = 1.3L
T₁ = 50°C + 273.15K = 323.15K
V₂ = Incógnita
T₂ = 300K
1.3L/323.15K = V₂/300K
1.2L = V₂
El volumen final del sistema es 1.2Ldilute hydrochloric acid+zinc metal
Explanation:
2HCl+2Zn----> 2ZnCl+H2
Explanation:
HCL + Zn= zncl2 + H2
plz mark my answer as brainlist if you find it useful.
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Which of the following is a distinguishing difference between rocks and minerals?
A. Minerals are aggregates of different rocks and elements.
B. Minerals have specific chemical compositions, but rocks do not.
C. Crystals are a type of rock and granite is a type of mineral.
D. Minerals are made of rocks combined in different combinations.
Answer:
B.
Explanation:
Minerals are formed due to chemical composition by rocks are pressured into their formed from dirt and naturally hard things.
The statement that represents a distinguishing difference between rocks and minerals is as follows:
Minerals have specific chemical compositions, but rocks do not.Thus, the correct option for this question is B.
What is the difference between rocks and minerals?A mineral is a naturally occurring substance with distinctive chemical and physical properties, composition, and atomic structure. Rocks are generally made up of two or more minerals, mixed up through geological processes.
Minerals are definitely formed due to chemical composition by rocks being pressured into their formation from dirt and naturally hard things. A rock is an inorganic and a solid naturally-formed substance without any chemical composition or atomic structure.
A mineral is also a solid, inorganic, substance as that like a rock which has a definite crystalline structure as well as chemical composition. Rocks form, break down and move through the rock cycle.
Therefore, the correct option for this question is B.
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What is the mass of a liquid that has a density of 124 g/mL and takes up a volume of 18 mL. What mass should the liquid have? (round you answer to the nearest hundredth)
Two forms of energy found in all systems are kinetic energy and
Answer:
Potential energy
Explanation:
What is the answer to the formula 12+6/2+10?
0 25
O 14
O 19
03.6
The answer was 25
Do according to bodmas rule
If you have 3 moles of calcium carbonate, how many grams of calcium bicarbonate are formed?
Answer:
hhjcioz xlioyudiyyxyisrupautwtritu regards Roy
An iron loses electrons. State the type of charge it will end up with
write in your own words
Answer:
Most atoms do not have eight electrons in their valence electron shell. Some atoms have only a few electrons in their outer shell, while some atoms lack only one or two electrons to have an octet. In cases where an atom has three or fewer valence electrons, the atom may lose those valence electrons quite easily until what remains is a lower shell that contains an octet. Atoms that lose electrons acquire a positive charge as a result because they are left with fewer negatively charged electrons to balance the positive charges of the protons in the nucleus. Positively charged ions are called cations. Most metals become cations when they make ionic
very urgent
1. Describe an experiment to show the chemical effect of electric current.
2. State three conditions necessary for combustion
3. Describe all that you observe when a piece of iron is placed in copper sulphate solution for a
few minutes.
Explanation:
STEP 1- Take two iron nails.
STEP 2- Clean it with sand paper.
STEP 3- Wrap copper wire around both the nails. And connect the other end to the battery terminal.
STEP 4- Take water in beaker and little amount of salt in it or a few drpos of sulphuric acid in it.
STEP 5- Immerse the nails in the solution.
STEP 6- Observe the nails carefully. You can see bubbles of gases coming out from water near nails.
When, electeric current is passed through water gases like hydrogen and oxygen are evolved.
2.Three things are required in proper combination before ignition and combustion can take place---Heat, Oxygen and Fuel. There must be Fuel to burn. There must be Air to supply oxygen. There must be Heat (ignition temperature) to start and continue the combustion process.
When iron is placed in Copper sulphate solution, the iron is coated with a brown coloured substance "copper" and CuSo4 solution changes from blue to light green. This is due to iron displaces copper as it is more reactive than copper.
Where is the youngest rock in the Atlantic Ocean found?
plz hurry
Answer:
Seafloor Ages
They found that the youngest rocks on the seafloor were at the mid-ocean ridges. The rocks get older with distance from the ridge crest.
hope this helped
Which processes are part of the fast carbon cycle?
Answer:
Option C
Explanation: Pass me the brainliest I only need 1
Help please!! I'll name you brainliest!!
Answer:
MgO
Explanation:
Tammy spent of her savings on a watch. She then spent-of
the remainder on a
.
5
bag. What fraction of her money did she have left?
Answer:
1 / 2 of her money would be left
Explanation:
Tammy spent 2/5 of her savings on a watch. She then spent 1/6 of the remainder on a bag. What fraction of her money did she have left?
Taking the question bits by bit;
Tammy spent 2/5 of her savings on a watch
Amount Spent = 2/5
Remainder = 1 - 2/5 = 3/5
She then spent 1/6 of the remainder on a bag
Amount Spent = 1/6 * 3/5 = 1/2 * 1/5 = 1 /10
Total amount spent = 2/5 + 1 /10 = (4 + 1 ) / 10 = 5 / 10 = 1 / 2
Amount left = 1 - 1 /2 = 1 / 2
HELPPPP I NEED TO SEND THEM TO MY TEACHER ITS REACTIONS AND SOME OF THEM MIGHT CANT HAPPEN
Answer:
Explanation:
follow the rule of "a weak acid can't make a stronger acid and weak base can't make a stronger base(it's pretty accurate for acid/salt reactions/replacemnts)" the last reactions won't work, but the second to last one will be kbr+pb(no3)2-> kno3 + PbBr2 (this is unballanced.) the first reaction will work. the second one i'm not too sure tbh, but i think it won't work since barium hydroxide's a weak base and if it were to react it would make koh, a super strong base
Answer:
3Ba(OH)2 + 2K3PO4 ----> 6KOH + Ba3(PO4)2
2KBr + Pb(NO3)2 ------> 2KNO3 + PbBr2
H3PO4 + 3KCl -----> K3PO4 + 3HCl
Explanation:
gases are also good conductors of electricity in discharge tube at
1)high pressure high voltage
2) low pressure low voltage
3) low pressure high voltage
4) never
pls help wil marks as brainliest
Answer:
3)low pressure and high voltage
Nepal is rich in species diversity why?? Explain with any three reason. Help this beginer out !!!
Answer:
Nepal is a multilingual, multiethnic, multicultural and multi-religious nation. Unity in diversity is the defining characteristics of Nepali society. Mutual coexistence, tolerance and cooperation have guided the people in achieving social cohesion, peace and happiness.
Explanation:
Please mark as brainliest!
Water often has dissolved gases and other chemicals in it. When this water encounters rocks, the minerals in the rocks can be changed by the process of
SCIENCE
What is it called when two or more elements are brought together?
A. Solution.
B. Mixture.
C. Chemical reaction.
Answer:
C
chemical reaction .
Answer:
C
Explanation:
Chemical reaction.
Clear selection
1 point
5. Choose the correct pair to
complete the given statement.
The size of the pupil _ (i) _ in
bright light to allow _ (ii) _ light
to enter our eyes.
O A. (i) increases and (ii) more
B. (i) decreases and (ii) more
O C. (i) increases and (ii) less
O D. (i) decreases and (ii) less
6. Which labelled part gives the 1 poi
human eye, its characteristic
colour
?
Answer:
I believe it is d! Reason being, when you cover your eyes with your hands for a period if time, and then move your hands, your pupils become wide, this means that when there is light your pupils are most like decreasing in size and allowing less light! :) hope this helps
ahh help, is it true or false?
Which of these is incorrect
Answer:
B
Explanation:
Ne has 10 electrons.
so the first shell will takes 2 (10-2=8)
the second shell will take 8 (8-8=0)