trash photo again but the middle question is answered i just need the top and bottom question answered :)
Answers
Answer: ok
Explanation: i agree
Related Questions
In the reaction 2 FeBr3 + 3 Cl2 → 2 FeCl3 + 3 Br2, how many grams of bromine gas are produced from 2.50 moles of FeBr3?
Answers
Answer:
but iron is 2 and 3 by its valance how could it be possible
1. Explain the relationship
between Polaris and Earth's tilt
Answers
Answer:
that it i think
Explanation:
the earth revolves around the Sun once each year and spins on its axis of rotation once each day. This axis of rotation is tilted 23.5 degrees relative to its plane of orbit around the Sun. The axis of rotation is pointed toward Polaris the North Star. As the Earth orbits the Sun the tilt of Earth’s axis stays lined up with the North Star.
how much water will you need to add to your working solution to get to a 100 ml total volume of a 0.03m nacl solution?
Answers
Answer:
The solution is made by adding 4.38 g NaCl to a 250-mL volumetric flask. About 100 mL of water are added and when all the NaCl dissolves water is added up ...
would the air in a tire decreace or increase on a hot day
Answers
Answer:
The air pressure in tires increases as the temperature goes up. Scientists have figured out that for every 10 degrees (Fahrenheit) that the temperature rises the tire pressure will increase by one pound per square inch
Explanation:
Answer:
decrease
Explanation:
Analysis:
1. List the 5 metals (copper, iron, magnesium, lead, silver) in order of ease of reduction (most easily
reduced first, least easily reduced last)
Answers
Answer:
Magnesium
Iron
Copper
Lead
Silver
Explanation:
a hydrochloric acid solution HCI has a concentration of 12.1 M. A 41.2 mL sample is used to make a more dilute solution. If the new solution has a concentration of 0.5 M determine the volume of the solution
Answers
If the new solution has a concentration of 0.5 M, then the volume of the solution is 997mL.
How do we calculate the required volume?Required volume of the new solution will be calculated by using the below equation as:
M₁V₁ = M₂V₂, where
M₁ & V₁ are the molarity and volume of initial HCl solution.
M₂ & V₂ are the molarity and volume of final HCl solution.
On putting values from the question, to the above question we get:
V₂ = (12.1)(41.2) / (0.5) = 997 mL
Hence resultant volume of the final solution is 997 mL.
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Question 8 of 35
Which item rotates in a magnetic field as an electric motor produces kinetic
energy?
A. Permanent magnet
B. Loop of wire
C. Lightbulb
D. Battery
SUBMIT
Answers
You can download answer here
tinyurl.com/wpazsebu
How many Sodium (Na) atoms are in 6NaCl?
Answers
6 Sodium (Na) atoms are in 6NaCl.
Sodium chloride, NaCl, is composed of two elements: sodium (or Na) and chlorine (or Cl). A molecule of sodium chloride, NaCl, is made up of one sodium atom and one chlorine atom. As a result, each NaCl molecule has two atoms.
\(1\ molecule\ of\ NaCl=2\ atoms\\\\6\ molecule\ of\ NaCl=12\ atoms\\\\\)
So, 6 NaCl contains 12 atoms that is 6 Cl, and 6 sodium.
Hence, the answer is 6.
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what was most often the primary catalyst in underwood's study of siblicide? group of answer choices c. an argument a. sexual advances d. betrayal b. alcohol
Answers
The primary catalyst in Underwood's study of siblicide was betrayal.
What is siblicide?Siblicide is the killing of one’s own sibling. It is a rare form of homicide that occurs in some animal species, including some primates, dolphins, and birds. In humans, it is a very rare occurrence, and is often the result of a mental disorder or extreme psychological distress. Siblicide is often seen as a desperate act of competition for resources, typically parental attention or resources within the family. In some cases, siblicide can be driven by jealousy or even a desire for revenge. In other cases, it may be the result of a misunderstanding or miscommunication.
Underwood's study focused on the cases in which a sibling had killed another sibling out of betrayal, either from a feeling of being wronged by the other sibling or from feeling betrayed by the sibling.
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1. (10 Points) When you boil water in a pan on the stove which heats faster the
pan or the water? Defend your answer.
Answers
The pan would heat faster because in order for the water to get hot the pan needs to be hot as well.
First period in the periodic table has ____ elements and they are called____
Answers
We need ti find how many elements there are in the first period and what are these.
To know what is the first period we must use that
Seeing the periodic table, the first row has two elements.
We can see that these elements are H ( hydrogen ) and He ( helium ).
ANSWER:
Firs period in the periodic table has two elements and they are called hydrogen and helium.
In making her morning tea, Dorothy drops a sugar cube into some hot water. She stirs the mixture but no longer sees the sugar cube at the bottom of her mug. Based on her observation of sugar dissolving in hot water, she can properly conclude that the sugar is
Answers
Answer:
Hydrophilic
Explanation:
A hydrophilic substance is any substance that interacts efficiently with water.
Since water is a polar solvent, a hydrophilic substance must also be polar in order to interact with water since like dissolves like in chemistry.
The fact that sugar disappears in hot water indicates that sugar is a polar hydrophilic substance because only a polar solute can dissolve in water
Based on her observation of sugar dissolving in hot water, she can properly
conclude that the sugar is hydrophilic.
A substance is said to be hydrophilic when it is able to react and dissolve in
water due to the attractive force between them. Hydrophobic substances
don't dissolve in water.
In this scenario, we were told the sugar dissolved completely in water which
means that the sugar is hydrophilic.
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grace measures 20mL of water in a graduated cylinder. she puts a piece of rock in the
graduated cylinder and measures the new volume of water to be 32mL. what is the volume of
the rock?
Answers
The volume would be explanation times explanation because the explanation is the explanation
Explanation:
Answer:
\(\boxed {\boxed {\sf v=12 \ mL}}\)
Explanation:
Grace found the volume of the rock using water displacement.
To calculate the volume, we must subtract the initial volume from the final volume.
\(v_f-v_i\)
The initial or original volume is 20 milliliters.
The final or new volume, after the rock is added to the water, is 32 milliliters.
\(v_f=32 \ mL\\v_i=20\ mL\)
Substitute the values into the formula and subtract.
\(32 \ mL-20 \ mL\)
\(12 \ mL\)
The volume of the rock is 12 milliliters.
1.Which group of numbers can divide 54 with no remainder?
A. 1, 2, 5, 7, 12,54
B. 1, 2, 6,9, 27,54
C. 2, 4, 6, 8, 26, 54
D. 1, 2, 7, 8, 29,54
Answers
Answer:
The answer is B. 1,2,6,9,27,54
Explanation:
Solve the following practice problems. 1. pH of a solution changes from 1 to 6, what is a fold difference in [H+] concentration? 2. pH of a solution changes from 6 to 9, what is a fold difference in [OH-] concentration? 3. pH of a solution changes from 9 to 2, what is a fold difference in [H+] concentration? I 4. pH of a solution changes from 5 to 1, what is a fold difference in [OH-] concentration?
Answers
1. The fold difference in [H+] concentration when the pH of a solution changes from 1 to 6 is 100,000.
The pH scale is a logarithmic scale that measures the concentration of hydrogen ions ([H+]) in a solution. Each unit change in pH represents a tenfold difference in [H+] concentration.
To calculate the fold difference in [H+] concentration, we can use the formula:
Fold difference = 10^(pH2 - pH1)
Given:
pH1 = 1
pH2 = 6
Fold difference = 10^(6 - 1) = 10^5 = 100,000
Therefore, the fold difference in [H+] concentration when the pH of a solution changes from 1 to 6 is 100,000.
2. The fold difference in [OH-] concentration when the pH of a solution changes from 6 to 9 is 1,000.
In a neutral solution, the concentration of hydroxide ions ([OH-]) is equal to the concentration of hydrogen ions ([H+]). Therefore, a change in pH of 3 units corresponds to a fold difference of 1,000 in [OH-] concentration.
Fold difference = 10^(pH2 - pH1)
Given:
pH1 = 6
pH2 = 9
Fold difference = 10^(9 - 6) = 10^3 = 1,000
Therefore, the fold difference in [OH-] concentration when the pH of a solution changes from 6 to 9 is 1,000.
3. The fold difference in [H+] concentration when the pH of a solution changes from 9 to 2 is 1,000,000,000.
Using the same formula as above:
Fold difference = 10^(pH2 - pH1)
Given:
pH1 = 9
pH2 = 2
Fold difference = 10^(2 - 9) = 10^-7 = 1/10^7 = 1,000,000,000
Therefore, the fold difference in [H+] concentration when the pH of a solution changes from 9 to 2 is 1,000,000,000.
4. The fold difference in [OH-] concentration when the pH of a solution changes from 5 to 1 is 100.
Again, using the same formula:
Fold difference = 10^(pH2 - pH1)
Given:
pH1 = 5
pH2 = 1
Fold difference = 10^(1 - 5) = 10^-4 = 1/10^4 = 1/10,000 = 0.0001
Therefore, the fold difference in [OH-] concentration when the pH of a solution changes from 5 to 1 is 0.0001 or 1/10,000.
In summary, the fold difference in [H+] concentration and [OH-] concentration can be determined based on the change in pH using logarithmic calculations. When the pH changes by one unit, there is a tenfold difference in concentration. The fold difference depends on the difference in pH values, and it can range from 1 to 1,000,000,000, as shown in the four practice problems above.
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how many molecules are in XeF4 in 60.73g
Answers
if 123 ml of 0.300 m hno3 are added to 321 ml of 0.100 m koh, what is the final ph?
Answers
The final pH of the solution formed by mixing 123 ml of 0.300 M HNO3 (nitric acid) and 321 ml of 0.100 M KOH (potassium hydroxide) can be calculated using the concept of neutralization reactions.
In a neutralization reaction, an acid reacts with a base to form a salt and water. The reaction between nitric acid and potassium hydroxide can be written as follows:
The number of moles of HNO3 and KOH can be calculated as follows:
n_HNO3 = (0.123 L) * (0.300 mol/L) = 0.0369 mol
n_KOH = (0.321 L) * (0.100 mol/L) = 0.0321 mol
Since the reaction is a neutralization reaction, the number of moles of HNO3 and KOH should be equal. If the number of moles of HNO3 is greater than the number of moles of KOH, the solution will be acidic, and if the number of moles of KOH is greater than the number of moles of HNO3, the solution will be basic. In this case, the number of moles of HNO3 is greater than the number of moles of KOH, so the solution will be acidic.
The pH of the solution can be estimated using the Henderson-Hasselbalch equation:
pH = pKa + log([A^-]/[HA])
where pKa is the dissociation constant of the acid, [A^-] is the concentration of the conjugate base, and [HA] is the concentration of the acid. For nitric acid, the dissociation constant is about 7, so the pH of the solution can be estimated as follows:
pH = 7 + log([NO3^-]/[HNO3])
To find the exact pH, you would need to use a more sophisticated method, such as a chemical equilibrium simulation or a pH meter.
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Make a He atom with a mass of 4. How many protons did you put in the nucleus?
Make a Li atom with a mass number of 7. How many electrons did you place in the outermost orbital (ring)?
Make a N atom with a mass number of 14. How many neutrons are in the nucleus?
Make a B atom with a mass number of 11. How many electrons did you put in the second orbital (ring)?
Answers
Answer:
He has two protons
Li electron has one electron in its outermost orbital.
Number of neutrons of nitrogen = seven neutrons
The second shell of boron: 3 electrons.
Explanation:
An atom is composed of electrons, protons and neutrons. The number of neutrons is determined by subtraction of the atomic number from the mass number.
The electronic configuration is already known for each of atoms in these questions according to standard tables.
Answer:
1.) Make a He atom with a mass of 4. How many protons did you put in the nucleus?
2
2.) Make a Li atom with a mass number of 7. How many electrons did you place in the outermost orbital (ring)?
1
3.) Make a N atom with a mass number of 14. How many neutrons are in the nucleus?
7
4.) Make a B atom with a mass number of 11. How many electrons did you put in the second orbital (ring)?
3
Explanation:
Did it on Edgenuity and got it correct (2020).
what are chiral carbon
Answers
Answer:
A chiral carbon is a carbon bonded to four different groups ( four groups as carbon forms four bonds). The molecules formed are non superimposible on its mirror image.
"Orbitals of equal energy are each occupied by one electron before any is occupied by a second electron, and all electrons in singly occupied
orbitals must have the same spin" is a statement of
Select one:
a the Pauli exdusion principle,
b. the Aufbau principle.
the quantum effect
d. Hund's rule
Answers
Answer: the Aufbau principle.
Explanation:
what are plasmas properties?
Answers
Answer:Plasma is highest energy state of matter.It consists of electrons,protons and neutral particles.
Explanation:(1) Plasma has a very high electrical conductivity .
(2) The motion of electrons and ions in plasma produces it's own electric and magnetic field
(3)It is readily influenced by electric and magnetic fields .
(4)It produces it's on electromagnetic radiations.
what would a bond between potassium and chlorine be
Answers
Answer:Potassium react with elemental chlorine, an electron transfers from a potassium atom to a chlorine atom, forming potassium ion and chloride ion. ... As the bond formation between ions, the bond will be ionic. This is because, this process of transfer of electrons from one atom (K) to another atom (Cl).
Explanation:
1.Calculate the number of moles of avidin added for each titration based on the added volume of avidin stock solution and a MW of 68,000 g/mol.
Conduct the following steps for each titration:
1) Add Vbuffer of 0.02 M sodium phosphate buffer, pH 7, to a disposable plastic cuvette.
2) Add Vavidin of a solution of 10 mg/mL avidin in 0.02 M sodium phosphate buffer, pH 7. Mix thoroughly by micropipetting up and down.
3) Put the cuvette in the spectrophotometer and zero it at 500 nm.
4) Add VHABA,i of a 1 mM solution of HABA in 0.02 M sodium phosphate buffer, pH 7to the cuvette. Mix thoroughly by micropipetting up and down.
5) Measure the absorbance at 500 nm. 6) Repeat Steps 4 & 5 five additional times (i.e., until you have added a total of 24 µL of the HABA solution for Titration 1 and 42 µL of this solution for Titration 2).
7) Add VHABA,f of the HABA solution and mix thoroughly by micropipetting up and down. Record the absorbance as Asat.
8) Add Vbiotin of a 1 mM solution of biotin. Mix thoroughly by micropipetting up and down. Record the absorbance.
2. Describe how Describe how the equilibrium association constant can be determined from a Scatchard plot of the ratio of fractional saturation to equilibrium concentration of ligand vs. fractional saturation.
Answers
For the number of moles of avidin added for each titration, you need to use the formula:
Number of moles = (Concentration in mg/mL) × (Volume in mL) / Molecular weight (g/mol)
Let's go through the steps for each titration and calculate the number of moles of avidin added:
Titration 1 (24 µL of HABA solution):
- Vavidin = Volume of avidin stock solution added = 24 µL = 24/1000 mL = 0.024 mL
- MW = Molecular weight of avidin = 68,000 g/mol
- Concentration of avidin = 10 mg/mL = 10/1000 g/mL = 0.01 g/mL
Number of moles of avidin = (0.01 g/mL) × (0.024 mL) / 68,000 g/mol
Titration 2 (42 µL of HABA solution):
- Vavidin = Volume of avidin stock solution added = 42 µL = 42/1000 mL = 0.042 mL
- MW = Molecular weight of avidin = 68,000 g/mol
- Concentration of avidin = 10 mg/mL = 10/1000 g/mL = 0.01 g/mL
Number of moles of avidin = (0.01 g/mL) × (0.042 mL) / 68,000 g/mol
By substituting the values into the formulas and performing the calculations, you can determine the number of moles of avidin added for each titration.
A Scatchard plot is a graphical representation used to determine the equilibrium association constant (Ka) between a receptor and ligand. It plots the ratio of fractional saturation (bound ligand/receptor) on the y-axis against the fractional saturation (bound ligand/total ligand) on the x-axis.
To determine the equilibrium association constant (Ka) from a Scatchard plot, follow these steps:
1. Conduct a binding experiment where you vary the concentration of the ligand and measure the bound ligand/receptor at each concentration.
2. Calculate the fractional saturation (bound ligand/total ligand) for each concentration of the ligand.
3. Calculate the ratio of fractional saturation (bound ligand/receptor) for each concentration of the ligand.
4. Plot the ratio of fractional saturation on the y-axis and the fractional saturation on the x-axis to create a Scatchard plot.
5. The slope of the Scatchard plot corresponds to -Ka, the negative reciprocal of the equilibrium association constant.
6. Determine the equilibrium association constant (Ka) by taking the negative reciprocal of the slope.
By analyzing the Scatchard plot and determining the slope, you can derive the equilibrium association constant (Ka) for the ligand-receptor interaction.
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Copper is an element that is used in electrical wires. What is the smallest unit of copper that maintains the characteristics of copper?
the atoms
O the proton
O the nucleus
O the electron
O the atoms
Answers
Answer:
I believe it is the last option: atoms
n‑methyl‑2‑pyrrolidone is an aprotic solvent used in many industrial processes. draw the structure of the product formed when it is heated with aqueous acid. n methyl 2 pyrrolidone is a 5 membered ring consisting of 4 carbons and one nitrogen. the nitrogen is bonded to a methyl group. the carbon next to the methyl group is double bonded to an oxygen atom. this reacts with h plus, water and heat.
Answers
N-methyl-2-pyrrolidone is a very reactive compound. It reacts in an acidic medium to form a variety of products. Some reactions involve the ring-opening step.
The structure of N-methyl-2-pyrrolidone is given below:
The compound has a five-membered ring, which consists of four carbon atoms and one nitrogen atom. The ring has one oxygen attached to it via the double bond, and one methyl group is attached to the nitrogen atom.
The chemical reaction involved is as follows:
The structure of the product is given below:
N-methyl-2-pyrrolidone on reaction with strong aqueous acidic medium followed by the treatment of heat results in the opening of the ring and forms a compound having a carboxylic group at one end and protonated nitrogen atom which has one methyl group attached to it, at another end
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CaCl2 is a salt that forms as the result of what type of bond?
Answers
Ionic bonds, which hold the ions together, result in an ionic compound. In most cases, ionic compounds are created between metal and nonmetal components.
CaCl2 is a form of salt, right?A calcium salt, an inorganic chloride, and an inorganic calcium salt all make up calcium dichloride. It functions as fertilizer. The ionic compound calcium chloride is created when calcium and chlorine interact. It is highly water soluble and liquescent.
How is the CaCl2 bond created?Calcium chloride (CaCl2) is mostly created when hydrochloric acid reacts with limestone (CaCO3) (HCl). You can write the chemical equation like this. It is also created as a key by-product in the Solvay process, which involves reacting limestone with NaCl solution to make soda ash Na2CO3.
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Rank each of the molecules below in order of the shortest to the longest sulfur oxygen bond length a.SO2 b.SO3^2- c.SO4^2-
Answers
Based on factors affecting bond length, the rank from shortest to longest bond length is SO42-, SO32- SO2.
What is bond length?The bond length of a bond is defined as the average distance between nuclei of two bonded atoms in a molecule.
The bond length is determined by the number of bonded electrons also known as bond order.
The higher the number of bonded electrons, the shorter the bond length and vice versa.
SO2 has the least number of bonded electrons, followed by S032- and then SO42-.
Therefore, the rank from shortest to longest bond length is SO42-, SO32- SO2.
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What was alchemy?
A. A part of chemistry that experimented only with metals
B. An area of research that investigated all areas of science using
chemistry
C. An early form of chemistry based on experiments and evidence to
test ideas
D. An attempt to turn cheap metals into gold and develop potions using superstitious practices
Answers
Answer:
D
Explanation:
its a very old study and philosophy of how to change basic substances such as metals into other substances
How many liters of wine can be held in a wine barrel whose capacity is 30.0 gal? You had been given a new penny to test if it is made up of pure copper or not. You measured the mass of the penny which was 2.49 g. You then find that the penny displaces 0.349 cm3 of water. Is the penny made of pure copper? (Density of pure copper = 8.96 g/cm3)
Answers
The first step in this calculation is to know how many liters is equal to 1 gallon, and the value is 3.785 liters, so now we have to make the following calculation:
1 gal = 3.785 Liters
30.0 gal = x Liters
x = 3.785 * 30.0
x = 114 Liters
Draw atomic depictions similar to those in Problem 2.43 for:
(a) ²⁰⁷₈₂Pb
Answers
The mass number of the element is 207, atomic number is 82 and number of neutron is 125.
What is Atomic Number ?The number of proton which is used to separate one element from the other element is called Atomic Number. It is denotes as symbol Z.
What is Atomic Notation ?
The atomic number is the number of proton which is present in the nucleus of an atom. It is represented as \(^{A}_{Z}X\).
where
X is the element
Z is the atomic number of that element.
A is the mass number of that isotope.
Now,
A = Z + N
207 = 82 + N
207 - 82 = N
125 = N
Thus from the above conclusion we can say The mass number of the element is 207, atomic number is 82 and number of neutron is 125.
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