stored oxygen and fuel gas cylinders . a. must be separated by 20 feet .
what location should compressed gas cylinders be kept?Label and separate the full and empty cylinders.
Store in a secure location that is dry, cool, ventilated, sheltered from the elements, apart from combustible items, and dry.
Cylinders should be kept away from doorways, aisles, elevators, gangways, staircases, and heat sources in a storage space that is easily visible, dry, well-ventilated, and out of the way. Put up "no smoking" signs all around.
How should oxygen cylinders be stored properly?To prevent them from toppling over, all oxygen cylinders should be fastened in racks or supports. A huge cylinder may reach 40 MPH in 0.5 seconds if it is toppled over and its valve comes off. It is strong enough to destroy two cinderblock walls.
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a 25.0-ml aliquot of an aqueous quinine solution was diluted to 50.0 ml and found to have an absorbance of 0.636 at 348 nm when measured in a 2.50-cm cell. a second 25.0-ml aliquot was mixed with 10.00 ml of a solution containing 23.1 ppm of quinine; after dilution to 50.0 ml, this solution had an absorbance of 0.903 (2.50-cm cell). calculate the concentration of quinine in parts per m
The concentration of quinine in parts per million when the solution had an absorbance of 0.903 is 22.0 ppm.
What is absorbance?
Absorbance is the amount of the light absorbed by the given substance. For quantitative analysis, absorbance can be determined using spectroscopy.
Va1 = 25.0 ml, Va = 50.0 ml, A1 = 0.636, l = 2.50 cm, Va2 = 25.0 ml, Vs = 10.0 ml, Z = 23.1 ppm, Vd = 50.0 ml, A2 = 0.903
where Va1 = volume of first aliquot, Va = volume after dilution, A1 = absorbance of first solution, l = length of the cell, Va2 = volume of second aliquot, Vs = volume of the solution, Z = concentration of quinine, Vd = volume of second solution, A2 = absorbance of second solution.
The concentration of quinine in the given solution is,
C = [A1 * Z * Vs] / [A2 - A1] Va2
C = [0.636 x 23.1 x 10] / (0.903 - 0.636) 25
C = 22.0 ppm.
Therefore, an absorbance of 0.903 has the concentration of quinine of 22.0 ppm.
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please help this is urgent
The ratio of the resistance of wires Y and X is 2:1
What is resistance?Resistance in an electrical circuit is used to calculate the current flow. The symbol for the ohm, a unit of measurement for resistance, is omega. The unit of resistance is named after German physicist Georg Simon Ohm, who looked into the relationship between voltage, current, and resistance. He is credited for creating Ohm's Law.
To ascertain the state of a component or circuit, resistance measurements are frequently made.
Since resistance is independent of length, it stays constant. The term resistivity itself refers to the material's resistance per unit length and unit area.
While the resistance depends on the length
R₁=ρL/A
R₂=ρ2L/A
R₂=2ρL/A
R₂=2R₁
Thus, the resistance of a second wire is twice that of a first wire.
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Palmitoyl-coa is a saturated, 16-carbon long fatty acid. How many acetyl-coa, nadh and fadh2 will be formed from the full oxidation of this molecule?.
The number of acetyl-CoA, NADH, and FADH2 that will be formed from the full oxidation of Palmitoyl-CoA are 8, 7, and 7, respectively. 8,7,7.
Palmitic acid is the most common type of fatty acid containing 16 carbon atoms and no carbon-carbon double bonds. A total of 7 cycles of beta-oxidation must be completed to completely break down fatty acids. This creates a total of 8 acetyl-CoA molecules, 7 NADH molecules, and 7 FADH2 molecules.
Palmitic acid is a long-chain saturated fatty acid with a 16-carbon skeleton. Palmitic acid is found naturally in palm and palm kernel oils butter cheese milk and meat. Once in the mitochondrial matrix, a multienzyme complex converts pyruvate to acetyl-CoA. In the process, carbon dioxide is released and a molecule of NADH is formed.
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match the correct vocabulary word to its definition.
words:
atom
element
chemical bond
molecules
answers:
a group of atoms that are held together by chemical bonds.
a substance that can’t be separated or broken down into simpler substances by chemical means.
the attractive force that holds atoms or subunits of atoms together.
the smallest unit of an element that maintains the properties of that element.
Which evidence suggests that the materials in the asthenosphere are near their melting point?.
Lighter elements make up the asthenosphere.
What results in the asthenosphere melting?The asthenosphere is made up of rocks that are colder than the melting point of those rocks. The substance has a tendency to flow and distort as temperature or pressure rises. Its melting point will decrease with a decrease in pressure, and the substance may start to melt.
The Greek term asthenis, which means feeble, gave rise to the name asthenosphere. The strength of the asthenosphere is less than that of the lithosphere above it. Asthenosphere will melt if the lithosphere's temperature rises sufficiently. This layer is ductile and easily deforms.
Plate tectonics is lubricated by the asthenosphere. The asthenosphere is our planet's unsung hero.
In the asthenosphere, convection cells are present. It's crucial to realize that the asthenosphere is fluid.
The asthenosphere is compressed by glaciers.
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Which best describes a rule of animals in the water cycle?.
As said, when they create waste, they aid in the condensation of water vapor.
What does the word "water" mean?Water is a substance that may exist in gaseous, liquid, and different solid phases and is composed mostly of the chemical elements oxygen and hydrogen. At room temperature, it is an odorless, colorless fluid with the important ability to dissolve a number of other substances.
Can one make their own water?Theoretically, this is possible, but the process would be quite dangerous. To create water, hydrogen and oxygen atoms are required. After combining them, you are still left with only individual hydrogen and oxygen molecules molecules.
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a tank holds 26.3 l of oxygen ( o2 ) at a pressure of 20.8 atm . what is the final volume, in liters, of this gas when it is released at a pressure of 2.70 atm with no change in temperature and amount of gas.
280.53 L is the final volume in liters.
Applying the ideal gas equation for O₂
PV = nRT
where P is pressure, V is volume, n is the number of moles of gas, R is gas constant and T is temperature
As n and T are not changing
So,
P₁V₁ = P₂V₂ ⇒equation 1
now from the question we have,
Given data;
P₁ = 20.8 atm, P₂= 2.70 atm
V₁ = 26.3 L
now we have to find the volume of a gas when pressure is changed.
V₂ = ?
Put values in equation 1
20.8 × 26.3 = 2.70 × ?
V₂ = 20.8 × 26.3 / 2.70
V₂ = 280.53 L
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At standard temperature and pressure, carbon dioxide has a density of 1. 98 kg/m^3. What volume does 0. 85 kg of carbon dioxide occupy at standard temperature and pressure?.
At STP, oxygen will have the same density as hydrogen at 4386 K and 1 atm. Equation 1 is solved for the following values: As a result, oxygen will have the same density as hydrogen at STP at 4386 K and 1 atm.
How is the gas law of Boyle calculated?The pressure (p) of a given quantity of gas changes inversely with its volume (v) at constant temperature, according to this empirical connection, which was established by the scientist Robert Boyle in 1662. In equation form, this means that pv = k, a constant.
Place an enormous piston or sealed syringe on its end, and then pile on more and more things.
The volume of air within will decrease as the pressure increases since these two numbers are inversely related.
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How do you handle leakage current?.
Certified control panel should be used and the cables and insulations for damage and replace the damaged one to avoid leakage current.
Leakage current flows when there is an electrical connection between the ground and a conductor. If the equipment is not grounded correctly the current will flow through other conductors. In the case of electrical devices, leakage current usually occurs as a result of faults in insulation or the fabrication of materials used to make parts such as semiconductors. The best ways to prevent leakage current are to always use shielded cables on motor installations and to make sure that these cables are grounded at both ends. and we have to also check cables and insulation for damage and replace ones that are broken or damaged.
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Calcium is an element. What is the smallest particle of calcium that has the same chemical properties of calcium?.
The tiniest calcium particle with calcium, Chemical properties is called an atom. The smallest component of an element, an atom has exactly the same chemical makeup as the element as a whole.
First off, that is inaccurate, and your justification is plagiarism. The smallest calcium particle that possesses calcium's chemical properties is an atom. Any attribute that can only be generated by altering a substance's chemical identity is referred to as a chemical property. Chemical properties include any of a material's properties that emerge during or after a chemical reaction. Simply put, it is impossible to detect a substance's chemical qualities by looking at it or touching it; instead, a significant amount of the substance's internal structure must be altered in order to explore its chemical properties.
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Why is it important for the surface area-to-volume-ratio of exchange surfaces to be maximized?.
It important for the surface area-to-volume-ratio of exchange surfaces to be maximized because it provides more space for the diffusion of gases.
Explain Adaptations of exchange surfaces?In order to breathe, organisms must take in oxygen and expel carbon dioxide from their bodies. Since these gases spread across exchange surfaces like the lungs, exchange surfaces are modified to maximize diffusion.
A short diffusion pathway across the exchange surface is ensured by the fact that the majority of gas exchange surfaces are incredibly thin (sometimes only one cell thick). Additionally, they will have a high surface area to volume ratio, which creates greater room for gas diffusion.
Additionally, the organism will have characteristics that maximize the differential in gas concentration across the exchange surface.
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Approximately how much of the oxygen in the atmosphere is absorbed by the ocean?.
The oceans take in between 50 to 80 percent of the oxygen in the atmosphere. 50 to 80 percent of the oxygen produced on Earth, according to scientists, is produced in the ocean.
Oceanic plankton, which includes algae, floating plants, and some bacteria that can atmosphere, are responsible for the majority of this output. The tiniest photosynthetic organism on Earth is a specific species called Prochlorococcus.
The layer of gases that surrounds the planet and is held in place by Earth's gravity is known as the atmosphere or air. The atmosphere of Earth shields life on the planet by maintaining the pressure necessary for liquid water to exist on the surface, absorbing ultraviolet sun radiation, and warming the surface by retaining heat.
The chemical element with the letters O and the atomic number 8 is called oxygen.
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a solution has a concentration of 0.52 m kbr and a volume of 0.020 l. it is then diluted to a concentration of 0.13 m. what is the new volume?
a solution has a concentration of 0.52 m KBr and a volume of 0.020 l. it is then diluted to a concentration of 0.13 m. So the new volume will be 80 mL.
What is the solution?The term "solution" refers to a certain kind of homogenous mixture made up of two or more substances. A solute, or substance that is dissolved in a solvent, is one of the components of such a mixture. On a scale where chemical polarity has an impact, a solution is mixing, leading to interactions that are unique to solvation. When the solvent comprises a greater portion of the mixture, as is frequently the case, the solution typically has the condition of the solvent. The concentration, which is a gauge of how much solute is present in a given volume of solution or solvent, is one crucial parameter of a solution. In cases where water serves as one of the solvents, the phrase "aqueous solution" is employed.
By using the law of equivalence:-
M1 V1 = M2 V2
known = unknown
0.52 M x 20mL= 0.13 x V2
V2 = 80 mL
so the new volume will be 80 mL.
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If 8.2 moles of Mg are burned, how many moles of MgO are produced?
8.2 moles of MgO is produced by burning 8.2 moles of Mg.
What is moles of atom?A mole is 6.02214076 x 10^23 of any chemical unit, including atoms, molecules, ions, and others. Due to the large number of atoms, molecules, or other components that make up any substance, the mole is a useful measure to utilize.
Here,
2Mg + 0₂ → 2MgO
Given, 8.2 moles of Mg
Molar mass of Mg = 24.305 g/mol
From the reaction equation ,
We get ,
2 moles of Mg form 2 moles of MgO
So, 8.2 moles of Mg form 8.2 moles of MgO .
We know that ,
Molar mass of MgO = 40.3044 g/mol
So 8.2 moles of MgO is formed by burning 8.2 moles of Mg.
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you have two organic chemicals, a and b. chemical a has an octanol water partitioning coefficient of 100,000 and chemical b has an octanol water partitioning coefficient of 1,000. which chemical would move more easily through the soil?
chemical b has an octanol water partitioning coefficient of 1,000. which chemical would move more easily through the soil
How is the experimentally obtained octanol-water partition coefficient calculated?For flavonoids belonging to the flavone, flavonol, flavanone, and isoflavonoid subclasses, the values of the octanol-water partition coefficient (log P) were calculated. Following the dissolution of each flavonoid in an octanol-water mixture and equilibration time, both fractions were examined using high-performance liquid chromatography.
The most popular method of expressing a compound's lipophilicity is through its octanol-water partition ratio, which is the ratio of a solute's concentration in an octanolic phase that is water-saturated to that of the same solute in an aqueous phase that is octanol-saturated.
The chemical divides more into the aqueous layer than the organic layer when the K value is less than one.
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in a mixture of gases with a total pressure of 15.0 bar, oxygen has a mole fraction of 0.41. what is the partial pressure of oxygen?
The partial pressure of oxygen would be 6.15 bar in a mixture of gases with total pressure of 15 bar, having oxygen the mole fraction of 0.41.
What is mole fraction and partial pressure and how the partial pressure comes out to be 6.15?Mole fraction is the ratio of number of components in one compartment to the total number of components present in a solution.Partial pressure is the individual pressure of a molecule in a mixture of molecules in a container.Here is given the total pressure that is P = 15 bar, and the mole fraction of oxygen that is X = 0.41.As we know the partial pressure of any gas can be calculated by multiplying the total pressure with mole fraction.15 bar x 0.41 = 6.15 partial pressure of O2, hence the partial pressure of oxygen in a mixture of gases would be 6.15 bar.To know more about pressure visit:
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What quantity of heat is required to raise the temperature of 450 grams of water from 15°C to 85°C? The specific heat capacity of water is 4.18 J/g °C.
0.0000121 J
132,000 J
0.0000152 J
152,000 J
Quantity of heat is required to raise the temperature of 450 grams of water from 15°C to 85°C, specific heat capacity of water is 4.18 J/g °C is 132000 J.
The expression for the specific heat capacity is given as :
Q = mc ΔT
where,
mass , m= 450 g
specific heat, c = 4.18 J/g °C
ΔT = 85 °C - 15 °C = 70 °C
Q = 450 ×4.18 × 70
Q = 132000 J
Thus, Quantity of heat is required to raise the temperature of 450 grams of water from 15°C to 85°C, specific heat capacity of water is 4.18 J/g °C is 132000 J.
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What must be the same on each side of a chemical equation?.
To solve such this we must know the concept of chemical reaction. Therefore overall mass must be the same on each side of a chemical equation.
What is chemical reaction?
Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
In a balanced chemical reaction, the number of atoms of each element in a compound or molecules must be same on both side of a chemical equation. The total mass of the reactant must be equal to the total mass on the products side.
Therefore overall mass must be the same on each side of a chemical equation.
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The most common isotope of uranium has an atomic number of 92 and mass number of 238. If a uranium atom alpha decays and emits a helium nucleus, what will the atomic number of the daughter nucleus be?.
The most common isotope of uranium has an atomic number of 92 and mass number of 238. If a uranium atom alpha decays and emits a helium nucleus the atomic number of the daughter nucleus be is 234
Isotopes are the member of family of an element that all have the same number of proton but different number of neutron and the nucleus of uranium 238 decay by alpha emission to form a daughter nucleus and the thorium 234 this thorium in turn transform into protactinium 234 and then undergo beta negative decay to produce uranium 234
And uranium 238 undergoes alpha decay to become thorium 234 and in this reaction uranium 238 loses two proton and two neutron to become the element thorium 234
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A 2. 26 l balloon of helium is at 30°c and 1. 61 atm, what is the pressure if the volume is increased to 4. 12 l?.
Answer:
0.8832 atm
Explanation:
Per Boyle's Law:
If the temperature is held constant, the volume of a fixed amount of gas is inversely proportional to its pressure:
V∝[tex]\frac{1}{P}[/tex]
and
[tex]P_1V_1=P_2V_2[/tex]
To find pressure resulting from a change in volume:
[tex]\frac{P_1V_1}{V_2}=P_2[/tex]
So:
[tex]P_1=1.61atm\\V_1=2.26L\\V_2=4.12L\\P_2=\frac{(1.61atm)(2.26L)}{4.12L}\\P_2=0.8832atm[/tex]
This answer makes sense because Boyle's Law states that a given volume of gas at a constant temperature should have a proportionally lower pressure as the volume is increased.
7) explain the role of crazing in determining the extent of maximum plastic deformation for some polymers.
The role of crazing in determining the extent of maximum plastic deformation for some polymers is that it cause then plastic softening and polymer undergoes hardening.
The crazing is the mechanism of plasticity. that act as tension. crazing caused the plastic softening. crazing is heterogenous localized deforming plastic. plastic deformation is the permanent distortion to the plastic. the microcrack will be create by the crazing. when we apply excessive tensile stress to polymer crazing develop. the tress , temperature and the strain are the factor for plastic deformation.
Thus, The role of crazing in determining the extent of maximum plastic deformation for some polymers is that it cause then plastic softening and polymer undergoes hardening.
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a chemistry student needs 60.0 ml of pentane for an experiment. by consulting the crc handbook of chemistry and physics, the student discovers that the density of pentane is 0.626 . calculate the mass of pentane the student should weigh out
37.6 grams of pentane
The density given in the CRC of 0.626 g/cm³ will be used to calculate the mass of pentane requred since Density = m/v and m= D x V
Be careful in this kind of questions to check for the units. In this case one has to remember 1 mL equal 1 cm³.
m = 0.626 g/cm³ x 60.0 cm³ = 37.6 g pentane
Student should way out 57.56 grams of pentane.
Density of pentane yes 0.626 grams per ml which can be used to find the mass of the pentane in 60 ml.
Density = mass of substance/ volume of substance
So,
Density of pentane = Mass of pentane / Volume of pentane
Therefore, Mass of pentane = Density of pentane X Volume of pentane
Mass of pentane = 0.626g/ml X 60ml = 57.56 grams
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There are two ways to culture bacteria in a school laboratory: as colonies on an agar gel plate, or in a... what?
A medical professional takes a little sample of anything from your body for a bacteria culture test.
What is bacteria culture test?The sample area is determined by your symptoms and the infection that your doctor feels you may have. The supplier delivers the sample to a lab. In the lab, specialists use unique methods to purposefully promote any microorganisms in the sample to grow and proliferate.
When the sample arrives in the lab, the personnel there uses particular procedures to encourage the cells to divide and proliferate.
This provides specialists with a sufficient number of bacterial cells for microscopic examination or testing for particular chemical reactions, including susceptibility to different antibiotics. Depending on the type of bacteria, the process can take one to five days.
The lab can confirm an infection if the sample has enough bacteria in it. The lab will inform the medical professional of the type(s) of bacteria that were discovered.
Therefore, A medical professional takes a little sample of anything from your body for a bacteria culture test.
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If you are given 100. g of carbon dioxide at STP, how many L would you have?
Ideal gas law is valid only for ideal gas not for vanderwaal gas. Therefore, 50.8L of volume would be occupy by carbon dioxide at STP.
What is ideal gas equation?Ideal gas equation is the mathematical expression that relates pressure volume and temperature. There is no force of attraction between the particles.
Mathematically the relation between Pressure, volume and temperature can be given as
PV=nRT
where,
P = pressure of gas
V= volume of gas
n =number of moles of gas
T =temperature of gas
R = Gas constant = 0.0821 L.atm/K.mol
Mole= given mass÷ Molar mass
mole= 100. g÷ 44.01 g/mol
=2.27moles
One mole of ideal gas contain 22.4L of volume
2.27moles of ideal gas contain 22.4L×2.27=50.8L of volume
Therefore, 50.8L volume would be occupy by carbon dioxide at STP.
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what number of moles of o2 is needed to produce 14.2 grams how many carbon atoms are contained in 2.8 g of c2h4 ? p4o10 from p? (molecular weight p4o10
0.250 moles of o2 is needed .
What is moles?
A mole is merely a measuring unit. In reality, it is one of the International System of Units' seven foundation units (SI). When existing units are insufficient, new units are created. Chemical reactions frequently occur at levels where using grammes would be inappropriate, but using absolute numbers of atoms/molecules/ions would also be misleading. As a result, scientists devised the mole to bridge the gap between extremely small and extremely huge numbers.
In the International System of Units, the mole (sign mol) is the unit of material amount. The amount of substance is a measurement of how many elementary entities of a certain substance are present in an object or sample. The mole is defined as having 6.022140761023 elementary entities.
The number of moles of
P4O10
can be obtained by dividing the given mass by the molecular weight of the compound:
mol P4O10=14.2
g×mol284g=0.05mol
The balanced chemical equation is:
P4+5O2→P4O10mol
O2=0.05
molP4O10× mol
O21 mol
P4O10=0.25 mol
0.250 moles of o2 is needed
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What character would be the best example of an archetype 1. 1 3?.
We all come across archetypes, which are recurring patterns, images, or feelings. Because archetypes do not physically manifest themselves, they appear to be more intellectual than physical.
It's similar to the account of God appearing to Moses, but only allowing Moses to view a portion of him since "no one may see me and survive" . They do, however, appear as "archetypal images" and recurring themes in consciousness. They act as influences that combine psychic materials into recognizable visuals. For instance, the stereotype of the Wicked Stepmother — You know what she looks like, at least to you, even if I haven't given a description. That mental picture you have is an archetypal picture. Even though I'm not making any specific suggestions, you can comprehend not only how she looks but also her psychic impact.
Even if you have never had a stepmother, the wicked stepmother in Cinderella resonates because of the Wicked Stepmother archetype.
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What benefits come from the Great Depression?.
The Social Security Act of 1935's provisions for an old-age pension and unemployment relief, as well as federal initiatives to increase access to mortgage lending and home ownership, were among the lasting innovations that the Great Depression left behind.
The Securities Exchange Commission was another reform that at least partially brought order and rationality to the equity and credit markets. The Depression also sparked the creation of a number of post-World War II international organizations, including the International Monetary Fund, the World Bank, and the General Agreement on Tariffs and Trade (which later became the World Trade Organization), which helped stabilize international markets and support previously unheard-of levels of trade and investment on a global scale.
It remains to be seen if the COVID-19 pandemic will foster innovations with comparable importance.
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which two of the following securities may be included in the strips program to create zero-coupon securities? treasury bills treasury notes tips treasury bonds
Bonds known as zeros don't offer any interest or coupons.With a zero, you pay less than the bond's face value when you buy it, and you don't get interest payments; instead, you're given the bond's face value when it matures.
Zero-coupon When stock prices fall, the cost of U.S. Treasury bonds—also known as Treasury zeros—often rises sharply.Zero-coupon The price of US Treasury bonds may rise dramatically if the Fed quickly cuts rates.
Zero-coupon U.S. Treasury bonds offer a modest risk-return profile when held alone.traditional zero-coupon Treasury bonds are more erratic than the stock market, despite providing lower long-term returns than US Treasuries.
What's worse is that there is no assurance they will increase when stocks do poorly.In 2008, Treasury zeros performed remarkably well, but they lost money in 2018 along with the stock market.
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Compare and contrast what three elements do all macromolecules share? explain how the chemical properties of lipids, nucleic acids, and proteins differ from carbohydrates.
Both the hydrogen and carbon atoms are present in every macromolecule.
How do macromolecules work?The molecules made up of smaller units are referred to as macromolecules. They are referred to as monomers. The macromolecules that are relevant to this discussion are those that may be present in the human body.
As we can see, biological macromolecules are frequently quite big. This is due to the fact that macromolecules often consist of a large number of units linked together. To create the macromolecules of proteins, lipids, carbohydrates, and nucleic acids, thousands of monomer molecules are bonded together.
The carbon atom and the hydrogen atom are present in every macromolecule. These are present in every macromolecule. The carbonyl bond is present because the carbs are lowering sugars. Lipids, nucleic acids, proteins, and amino acids do not undergo carbonyl reduction processes because they do not contain a carbonyl group.
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what is the molarity of a solution made by adding 50 ml of 2.00 m nitric acid with enough water to make 450.0 ml of solution?
A solution that is created by adding 50 ml has a molarity of 9Moles. Nitric acid is an acid that produces one hydrogen ion and one nitrate ion.
Molarity calculator : What is it?The mass of the substance needed to produce a particular molar concentration and volume is determined by the molarity calculator.
How can I translate m2 to volume?We all know that a square meter is a unit of area and a cubic meter is a unit of volume. When we multiply length, breadth, and thickness, we obtain cubic meters, and when we multiply length by breadth, we get square meters.
What volume is 1 mL?The volume unit in the metric system is the milliliter, represented by the letters ml or ml. One cubic centimeter, or one liter, is equal to 1,000 milliliters. In the imperial system, that amounts to only 004 of a c.
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