Select ALL the statements that are TRUE about this lab.
Note: You must select all the statements to earn credit. Partial answers will not receive partial credit.
Group of answer choices
The λmaxλmax for each dye will need to be determined before collecting individual absorbance data.
You will need to bring to the lab TWO commercial products to test the concentrations of the dyes.
You will need to create ONLY one calibration plot in this lab.
Beer's Law will be used to determine the unknown concentration of the dye.
We will use titration to determine the dye concentration.
Answers
The TRUE statements about this lab are:
1. The λmax for each dye will need to be determined before collecting individual absorbance data.
2. Beer's Law will be used to determine the unknown concentration of the dye.
The statement "The λmax for each dye will need to be determined before collecting individual absorbance data" is true.
In order to accurately measure the absorbance of a dye, it is important to determine the wavelength at which the dye absorbs light most strongly (λmax).
This will ensure that the spectrophotometer is set to the appropriate wavelength for the specific dye being measured, resulting in the most accurate and precise data.
The statement "Beer's Law will be used to determine the unknown concentration of the dye" is also true.
Beer's Law is a principle that relates the concentration of a substance to the amount of light it absorbs. By measuring the absorbance of a dye at a specific wavelength, and knowing the molar absorptivity (ε) of the dye, the concentration of the dye can be calculated using Beer's Law.
This allows for the determination of the concentration of an unknown dye sample, provided the absorbance is measured accurately and the λmax has been determined.
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Related Questions
does an oxygen atom form two covalent bonds?
Answers
Answer:
yes
Explanation:
Two covalent bonds form between the two oxygen atoms because oxygen requires two shared electrons to fill its outermost shell.
nitriles are hydrolyzed in aqueous solution under either acidic or basic conditions to yield
Answers
Nitriles are hydrolyzed in aqueous solution under either acidic or basic conditions to yield carboxylic acids or carboxylate ions respectively.
What are nitriles?A nitrile is an organic compound that features a cyano functional group (-C≡N) in which the carbon and nitrogen atoms share a triple bond. Nitriles are also known as cyano groups because of this. Nitriles are essential intermediates in the manufacture of a variety of chemicals, including solvents, polymers, dyes, and pharmaceuticals.
Nitriles hydrolyze to form carboxylic acids or carboxylate ions depending on whether they are hydrolyzed under acidic or basic conditions, respectively. This occurs by the addition of a hydroxide anion to the nitrile group's carbon atom to form a tetrahedral intermediate, which is then followed by a proton transfer step to produce the carboxylic acid or its conjugate base: RCN + 2H2O → RCO₂H + NH₃.
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Organic compounds are a source of _______.
Answers
Answer:
Petroleum and coaltar are the main sources of organic compounds. (edit: Protein is most likely correct because I did some further research and I am mistaken I believe the other answer is right because it is also found to be a source of energy aka protein)Explanation:
I’m kinda stuck with this part of the paper
Answers
Answer:
oK so pay pattention to the fractions
Explanation:
The chemist is standing inside a room with oxygen in the air and has a balloon filled with hydrogen. The chemist holds a small flame up to the hydrogen balloon. When the balloon pops, the hydrogen explodes in a ball of fire. Based on what you know about breaking and forming bonds, explain which part of the reaction is higher in energy (i.e., does it take more energy to break the bonds of the reactants, or is more energy given off when the product bonds are formed
Answers
In this specific reaction, more energy is given off when the product bonds (water) are formed than the energy required to break the bonds of the reactant (hydrogen).
The hydrogen balloon popping and exploding in a ball of fire in the example scenario shows an exothermic reaction. We can think about the building and breaking of chemical bonds to comprehend the energy changes that occur during the reaction.
In the case of the hydrogen balloon, hydrogen gas (H2) serves as the reactant, while water (H2O), which results from the reaction of hydrogen with oxygen (O2) in the air, is most likely the product.
Given that hydrogen molecules' bonds are relatively strong, breaking them takes energy input. On the other hand, as the oxygen and hydrogen atoms combine to form new bonds, the production of bonds in water releases a considerable amount of energy.
In this reaction, the energy released from the formation of the water bonds is greater than the energy required to break the hydrogen bonds. Consequently, the overall reaction is exothermic, and the energy released is observed as a ball of fire.
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Which processes contribute to the formation of chemical sedimentary rocks?
Answers
Answer: the answer is B: Minerals dissolve and crystallize! :D
Explanation: hope this helps!
What type of particles move to create electricity
Again for the subject there was no sentence
Answers
Answer:
Electrons
Explanation:
Pls help 20 points!
At a manufacturing plant, Xanti adds
205, moles of NO2 gas to a storage
tank as a component to generate nitric
acid. How many liters of NO2 gas did
he add, assuming the system is
maintained at STP?
Answers
The volume (in liters) of the NO₂ gas that Xanti added to the containers, given that he added 205 mole of the gas is 4592 liters
How do i determine the volume (in liters)?First, we shall list out the given parameters from the question. This is shown below:
Number of mole of NO₂ gas = 205 molesVolume of NO₂ gas =?The volume (in liters) of the 205 moles of NO₂ gas can be obtained as illustrated below:
At standard temperature and pressure, STP,
1 mole of NO₂ gas = 22.4 Liters
Therefore,
205 moles of NO₂ gas = (205 mole × 22.4 Liters) / 1 mole
= 4592 liters
Thus, we can conclude from the above calculation that the volume of NO₂ gas added to the container is 4592 liters
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Need Help! 20 Points!!!!!
Answers
noble gases
halogens
metalloids
alkaline earth metals
13
Which one is heavier? 1 mole of Pbd,, 1 mole
of H, and 1 mole of Pb(NO3)2
A. Pbd
В. Н,
C. С None of them
D. Pb(NO3)2
Answers
Answer:
1 mole of Pbd - 239.3 g
1 mole of H - 1.008 g
1 mole of Pb(NO3)2 - 331.2 g
So D
Explanation:
1 mole of lead nitrate is heavier as it is a compound and is composed of three different kinds of atoms.
What is a compound?
Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.
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Are most elements found in compounds
Answers
Answer:
Yes, but not all. Due to some elements don't have reaction power due to their octet state they tend not react. So they most likely wouldn't be in
a compound. Elements like Noble gases elements the group 8 or as they can call it the group 0(rare gases).
When no more solute will dissolve in a solvent, the solution is_________.
Answers
Answer:
saturated solution because it can only dissolve upto fixed temperature
Answer:
Saturated
Explanation:
Explanation from online:
"When the solution equilibrium point is reached and no more solute will dissolve, the solution is said to be saturated. A saturated solution is a solution that contains the maximum amount of solute that is capable of being dissolved."
Stay Safe, and I hope this helps!!!!
Under what condition does the ideal gas line not apply and gases are considered real? Check all that apply
Answers
Answer:At high pressure and low temperature.
Explanation:
At high pressure voleme of a gas is'nt negligible as compared to the container
And at low temperature, kinetic energy of gas molecules lower, so they come closer to one another and intermolecular forces between them are considerable
What is a better way to harness the energy of a flowing river than traditional damming?
Answers
One method that may be used to replace traditional damming is the use of sub-surface dams to prevent the environmental consequences of dams while still harnessing the flowing water.
What is a sub-surface dam?Just as it sounds, it is a dam that is built underneath the surface.The aim is to harness the energy of flowing groundwater. This results in less water becoming stagnant, as with traditional dams. They also reduce the risk of floods and the rate of evaporation of the water. This all results in many positive environmental and ecosystem benefits.Therefore, we can confirm that the building of a sub-surface dam would result in less water being lost to evaporation, as well as the ecosystem benefits of not completely stopping the flow of water the way a traditional dam does.
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−5 Using the TE filtration model, examine the effect of filtration rate on filter performance for particles with diameters of 0.1,1.0, and 10μm. Assume a monodisperse media of 0.5 mm diameter, porosity 0.42, particle density 1020 kg/m
3
, filter depth 1 m, temperature 20
∘
C, Hamaker constant Ha=10
−20
J, and attachment efficiency 1.0. Plot the results as C/C
0
as a function of filtration rate over a range from 1 to 25 m/h. Comment on the effect of filtration rate and particle size on filter performance.
Answers
The concentration of particles is also determined by particle size, with smaller particles having a higher concentration than larger particles at the same filtration rate.
The effect of filtration rate on filter performance for particles with diameters of 0.1,1.0, and 10μm using the TE filtration model is a monodisperse media of 0.5 mm diameter, porosity 0.42, particle density 1020 kg/m3, filter depth 1 m, temperature 20 ∘C, Hamaker constant Ha=10−20 J, and attachment efficiency 1.0 is assumed here.
The results of the plot are commentary on the effect of filtration rate and particle size on filter performance. The graph indicates that as the filtration rate increases, the concentration of the particle decreases. Therefore, the filter performance improves as the filtration rate increases.
As the particle diameter increases, the filtration rate and particle concentration decrease. Consequently, the filter performance declines as the particle size increases. As a result, particle size and filtration rate significantly influence filter performance.
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Why do cells prefer purine and pyrimidine salvage pathways over de novo synthesis?
Answers
Cells prefer purine and pyrimidine salvage pathways over de novo synthesis because of less input energy requirement.
What is the difference between de novo and salvage pathways?The key difference between de novo and salvage pathway is that de novo synthesis of purine nucleotides refers to the process that utilizes small molecules such as phosphoribosyl, amino acids, CO2 etc. as raw materials to produce purine nucleotides.
While salvage pathway of purine synthesis refers to the process that utilizes purine bases and purine nucleosides in order to produce purine nucleotides.
The nucleotide salvage pathway enzyme purine nucleoside phosphorylase (PNP) is found in many organs, although it seems to be most abundant in the liver's hepatocytes, Kupffer cells, and sinusoidal endothelial cells. Purine bases like adenine, guanine, and others are produced during the metabolic breakdown of nucleotides and nucleic acids.
This route is less complicated and uses a lot less energy. De novo synthesis and nucleoside salvage are two different strategies to make nucleotides. The salvage pathway obtains nucleosides or bases created during DNA or RNA degradation, in contrast to the de novo pathway, which creates nucleotides from amino acids and glucose.
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The sun melts a popsicle. is what type pf transfer
Answers
Answer:
heat?
Explanation:
the sun warms the popsicle, therefore melting th popsicle.
sry if this is wrong
is A tomato smells rotten a chemical
reaction
Answers
Answer:
yup
Explanation:
because chemical change took place
the reaction cant be reversible
In How penicillin was discovered
. Write a statement that summarizes the results of the experiment bacteria
. This experiment lead to the development of what major medical advancement?
Answers
In 1928, Sir Alexander Fleming was studying Staphylococcus bacteria growing in culture dishes. Bacterial infections are treated with penicillins
What is penicillin used for?Bacterial infections are treated with penicillins. The germs are either eliminated or their growth is stopped. Penicillins come in a variety of varieties. Every one of them is employed to cure various infections. Penicillin-class medications include amoxicillin and penicillin. Penicillin's naturally occur in nature and are the basis for the drugs penicillin V and penicillin G; nevertheless, amoxicillin was created by chemically enhancing penicillin's to increase their potency. Amoxicillin hence has a tendency to treat more bacterial illnesses.Staphylococcus bacteria were being studied in culture dishes in 1928 by Sir Alexander Fleming. In several of the dishes, he also saw the growth of a mold called Penicillium. The mold was surrounded by a clear space since all the microorganisms that had colonized it had perished. No clear areas could be seen in the culture dishes that were mold-free.According to Fleming's theory, the mold must be releasing a chemical that kills the bacteria. To find out if this compound might kill bacteria, he made the decision to isolate it. The mold was transferred by Fleming to a broth solution containing nutrients. Each element the mold need to grow was present in this solution.
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These compounds can be formed in the strecker synthesis from ketones or aldehydes, and a ramachandran plot can visualize dihedral angles that are formed between the:__________
Answers
The compounds formed in the Strecker synthesis from ketones or aldehydes are amino acids, and a Ramachandran plot can visualize the dihedral angles (phi and psi angles) that are formed between the peptide bonds in a protein structure.
In the Strecker synthesis, the compounds that can be formed from ketones or aldehydes are amino acids. Amino acids are organic compounds that contain an amino group (-NH2) and a carboxyl group (-COOH). They are the building blocks of proteins.
A Ramachandran plot, on the other hand, is a graphical representation used to visualize the dihedral angles that are formed between the peptide bonds in a protein structure. These angles are known as phi (Φ) and psi (Ψ) angles. Phi angle refers to the rotation around the alpha carbon (Cα) and the nitrogen (N) atoms, while psi angle refers to the rotation around the alpha carbon (Cα) and the carbon (C) atoms.
In a Ramachandran plot, the x-axis represents the phi angle, and the y-axis represents the psi angle. By plotting the phi and psi angles for each residue in a protein, a Ramachandran plot can provide insights into the overall conformation and stability of the protein structure.
To summarize, the compounds formed in the Strecker synthesis from ketones or aldehydes are amino acids, and a Ramachandran plot can visualize the dihedral angles (phi and psi angles) that are formed between the peptide bonds in a protein structure.
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Musical instruments, and crystal stemware are examples of _______
A. Frequency
B. resonance
C. interference
D. speed.
Free 10 points!!!
Answers
Answer:
Your answer is resonance.
What is the molar mass of carbon?
Answers
How much percent of the earth is water?
Answers
Answer:70%
Explanation:
Answer:
71%
Explanation:
71% of the earth is covered by water and oceans hold about 96 percent of the water
A scientific theory states that the universe is expanding. Which of these statements is correct about this theory? (2 points)
Group of answer choices
It is a fact which cannot change over time.
It is strengthened by data which is always contradictory.
It will become a law if it is supported by scientific evidence.
It is a well supported explanation which cannot become a law.
Answers
Answer:
the answer is the most definitely D
Answer:
It is a well-supported explanation which cannot become a law.
what is a salient factor?
Answers
Answer:
technology is a silent factor
Explanation:
learned about it in computer class.
What happens during evaporation? A liquid changes to a gas. A liquid changes to a solid. A gas changes to a liquid. A solid changes to a liquid.
Answers
Answer:
A liquid changes to gas
Explanation:
"Evaporation is the process by which water changes from a liquid to a gas or vapor. Evaporation is the primary pathway that water moves from the liquid state back into the water cycle as atmospheric water vapor."
Answer:
B
Explanation:
Giving the answer
Zelda noticed a puddle outside her front door. She saw that the puddle got smaller every day, until the 3rd day when it was completely gone. The next week, she noticed the puddle again. This time the puddle was gone the next day. Since the sun was out the second week but not the first week, Zelda hypothesized that the heat from the sun was the reason for the water evaporating at a faster rate. If she were to set up two containers with equal amounts of water, what would be the best way for Zeldato test her hypothesis\
Answers
Answer: Zelda should place one container of water in sunlight (by a window or outdoors) and the other container in a dark room (closet) away from the sun.
Explanation: This would allow Zelda to test two different settings (sun and no sun) so she can test her hypothesis.
Balance the equation:
SO₂ +
Li₂Se →
SS₂ +
Li₂O
Answers
Answer:
Explanation:
english please
For the equation SnO2 + 2H2 Sn + 2H2O, tin (IV) oxide reacts with excess hydrogen to produce tin and water. What is the limiting reactant?
A) SnO2
B) H2
C) Sn
D) H2O
Answers
Answer:
SnO2
Explanation:
The limiting reactant is the reactant that runs out first during a chemical reaction.
Reactants are on the left side of the reaction, so SnO2 and H2. They tell us in the question that there is "excess" hydrogen (H2), so we know there is plenty of it, as "excess" means "more than enough." If we have more than enough hydrogen, then we know that we will run out of SnO2 first.
:)
Answer:SnO2
Explanation:
hen a student prepares an aqueous solution zin containing the five cations Ag (aq). Hgag) Cuag), Mn(aq), and Ba? ag), the student observes that no precipitates form in the solution. Which of the following could-be the identity of the anion in the solution? (A) CI (aq (B) CO3 (aq) (D NO3 (ag E) SO,2 (ag) 10 Fior uhich of the following processes does
Previous question
Next qu
Answers
We can say that the identity of the anion in the solution could be nitrate ion, NO3(-) (option D).Hence, the correct answer is option D.
When a student prepares an aqueous solution zin containing the five cations Ag(aq), Hg2(aq), Cu(aq), Mn(aq), and Ba(aq), the student observes that no precipitates form in the solution. The identity of the anion in the solution could be nitrate ion, NO3(-) (option D).
Explanation: In the given question, we are given an aqueous solution containing five cations - Ag(aq), Hg2(aq), Cu(aq), Mn(aq), and Ba(aq). The solution is neutral, i.e., neither acidic nor basic (no mention of H+ or OH- ions is given in the question), but contains five different cations.
To determine the identity of the anion in the solution, we have to consider the solubility rules. The solubility of a salt depends on the nature of the cation and anion, and their interaction with water. The solubility rules for common salts can be found in the table below:From the table, we can see that the salts containing Ag+, Cu+, Mn2+, Hg22+ ions are insoluble with Cl- and CO32-, but they are soluble with nitrate ions (NO3-). The barium ion is soluble with all anions, so the presence of Ba2+ in the solution does not eliminate any of the anions.
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