1.63×10^-18J is the energy for the transition of an electron from the level n=1 to the level n= 2 of a hydrogen atom.
According to the Bohr equation for hydrogen atom,
Energy, ∆E= -RH[(1/nf2 ) - (1/ni2)]
Where RH is the Rydberg constant and its value is 109737.3cm-1, 'nf' and 'ni' are integers that represent the energy levels.
1). ni= 1 and nf= 2, substituting these values in Bohr equation,
∆E = -109737.3cm-1[(1/22). -(1/12)
= -109737.3cm-1[(1/4) -1]
= -109737.3cm-1[0.25-1]
= -109737.3cm-1(-0.75)
= 82302.975cm-1
=82302.975×1.986×10-23J
=1.63×10-18J
(where 1 cm-1= 1.986×10-23J)
Here the electron jumps from n=1 to n=2, so it must absorb a photon of light. Therefore this is an absorption process.
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How many different uncharged (neutral) stable hydrogen atoms can you build? In the space below, briefly describe the similarities and differences in their composition.
The number of different uncharged (neutral) stable hydrogen atoms which one can build is two and the similarity is that they both have a single proton while the difference is that one has a neutron while the other has zero neutron.
What is an Atom?This is referred to as the smallest particle of an element which can exist and has subatomic particles such as proton and neutron.
The different uncharged (neutral) stable hydrogen atoms which one can build include:
1p & 0n & 1e1p & 1n & 1eFrom this we can infer that they both have one proton and electron and one has no neutron while the other has just one.
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g explain how to calculate an rf value and what that information can tell you about the success of your reaction. was your guaifenesin synthesis successful?
RF value is qual to the distance travelled by solute over the distance travelled by the solvent.
RF value or the retention value is a physical constant that helps to identify the distance travelled by different solutes that are present in the same solution. This method is generally used in chromatographic techniques, to record the progress of any particular reactions occurring.
In Chromatography RF values are the most basic prerequisite of the experiment. The values that we get from the RF values indicates whether the solute prefers the stationary or mobile phase. With these stationary or mobile phases, RF values are used to determine the polarity, relative masses and also relative stability among other things.
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What can dehydration lead to?.
Dehydration can range from mild to severe, depending on how much fluid you lose from your body. Thirst and black urine are two early indicators of dehydration. The body is attempting to enhance water intake and reduce water loss by doing this.
Other signs can include:
a feeling of faintness or dizzinessheadache fatiguedry eyes, lips, and mouth, and infrequently passing little volumes of the urine (less than three or four times a day)Strength and stamina can also be lost as result of dehydration. It is a major contributor to heat exhaustion.By consuming extra liquids, you should be able to reverse dehydration at this point.Chronic dehydration can affect your kidney function and raise your risk of kidney stones. In addition, it can also lead to the muscle damage and constipation.
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which of the following will change the value of an equilibrium constant? changing temperature. adding other substances that do not react with any of the species involved in the equilibrium. varying the initial concentrations of reactants. varying the initial concentrations of products. both (a) and (c)
Answer: The only thing that changes an equilibrium constant is a change of temperature.
Explanation:
The position of equilibrium may be changed if you change the pressure. According to Le Chatelier's Principle, the position of equilibrium moves in such a way as to tend to undo the change that you have made.
which element has the ground-state electron configuration 1s22s22p3? multiple choice question. n b o c
The element has the ground-state electron configuration 1s² 2s² 2p³ is nitrogen.
The electronic configuration for given element is given as follows :
1) Nitrogen : the atomic number of the nitrogen is 7.
electronic configuration : 1s² 2s² 2p³
2) Boron : the atomic number of the boron is 5.
electronic configuration : 1s² 2s² 2p¹
3) Oxygen : the atomic number of the oxygen is 8.
electronic configuration : 1s² 2s² 2p⁴
4) Carbon : the atomic number of the carbon is 6.
electronic configuration : 1s² 2s² 2p²
Thus, The element has the ground-state electron configuration 1s² 2s² 2p³ is nitrogen.
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when a reaction is properly refluxing, where should you see the vapors from the heated mixture? select one: vapors should be escaping from the top of the condenser. vapors should be contained to the reaction flask. no visible vapors should be formed. vapors should be about 1/3 up the condenser height.
Answer: Vapors should be contained to the reaction flask
Explanation: O Vapors should be about 1/3 up the condenser height.
The diagram above shows the repeating groups of atoms that make up two samples. Both samples are green gases at room temperature. Will the other properties of the two samples be the same or different?
It is important to note that the properties of the green gas of the sample can remain the same because the repeating groups of atoms that make up the sample have an identical quantity of atoms and an identical temperature.
What is green gas?Greenhouse gases are defined as gases that absorb and emit radiant energy in the thermal infrared spectrum, causing the greenhouse effect. The following according to scientific studies account for the primary or key greenhouse gases in the atmosphere of the earth:
Water vaporcarbon dioxidemethanenitrous oxide, and ozoneNote as well that one of the four basic forms in which matter exists is gas. A pure gas can be composed of individual atoms, elemental molecules composed of one kind of atom, or complex molecules composed of many atoms. A gas mixture, such as air, comprises a variety of pure gases.
Gas contracts when pressure is applied to it. When the pressure is discharged, expansion occurs with the gas.
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A measurement of the heat produced when a known amount of sugar burns in a constant volume calorimeter would enable us to first calculate the.
There is a molar internal energy change during sugar combustion. W = 0 for comb calorimeters since Delta V = 0 and Delta E = q + w. Delta then
E = q.
What makes water an ideal heat transmission medium in calorimetry?Due to its high specific heat capacity, water can absorb a lot of heat energy without boiling or even appreciably changing its temperature. This makes water a suitable medium for heat exchange in calorimetry.
Utilizing calorimetry, heat transport rates to or from a substance are determined. This is accomplished by transferring heat using a calibrated object (calorimeter). Utilizing the calorimeter's recorded temperature change allows us to determine how much heat the process under study transmits.
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Which ONE of the following objects is accelerating?
Read over each answer choice carefully before choosing one.
A sign is hanging on a pole in front of a shop
A car is sitting still at a stop light. It's current speed is 0 mph
A skydiver falling down towards Earth opens their parachute, causing them to
slow down from 50 m/s to 2 m/s
A lion walks East across the savannah at a speed of 5 miles per hour
Option a is correct choice a sign is hanging on a pole in front of a shop Because hanging object has gravitational acceleration.
Is the acceleration of 9.8 gravitational?9.8 m/s/s is the most precise measurement of the gravitational acceleration. This number (to the second decimal place) exhibits a small range that is primarily influenced by altitude.
The term "gravitational acceleration," abbreviated "g," is used in physics to describe the strength of a gravitational field. Meters per second squared (m/s 2) is the unit of measurement. 1 g is approximately 9.8 m/s 2 at the earth's surface.
Newton's universal law of gravitation states that the force of attraction between any two bodies is inversely proportional to the square of the distance between them and directly proportional to the product of their masses.
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Calculate the ph of a dilute solution that contains a molar ratio of potassium acetate to acetic acid (pka = 4. 76) of 2:1.
A solution with a molar ratio of potassium acetate to acetic acid has a pH of 5.061.
Describe acetic acid.Acetic acid, which has the formula CH3COOH, is also known as ethanolic acid, ethylic acid, vinegar acid, and methane carboxylic acid.
Acetic acid, a byproduct of fermentation, is responsible for vinegar's distinctive scent. 4-6% of the acetic acid in vinegar is made up of water.
Acetic acid is a colorless, acidic organic molecule having the chemical formula CH3COOH. Its official name is ethanoic acid. Acetic acid constitutes at least 4% of the volume of vinegar, making it the main ingredient, along with water and other minor components.
pH pKa log
pH 4.76 log ([acetate]/[acetic acid]),
pH = pka + log [acetate/acetic acid]
pH = 4.76 + log ( 2/1)
pH = 4.76 + 0.301
pH = 5.061
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The product of the pressure and the volume of one mole of a gas is equal to the product of the absolute temperature and the universal gas constant.
The rule that states the absolute temperature of a gases and the universal gas standard are equivalent to the product of the volume and the pressure of a single gram of an ideal gas.
What is an example of temperature in chemistry?The associated with the motion energy of atoms or molecules as in system is measured by temperature. The water droplets in a hot cup coffee move more quickly than the hydrogen atoms in a cup of iced tea because the average kinetic energy of hot coffee is higher.
What factors in chemistry affect temperature?The addition of energy (heating), which raises the temperature, increases the movement of atoms and molecules. By removing energy (cooling), atoms and molecules slow down and the temperature drops as a result.
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effect of using synthetic fuels on co2 emissions: a compact passenger car that runs on natural gas emits 0.218 kg co2 per mile driven
The output of CO2 and other pollutants discharged into the environment can be greatly decreased by the use of synthetic gas and biofuel. Synthetic fuel for commercial flights and fuel for automobiles are still a long way off, though.
Does coal produce more CO2 than natural gas?When burned in a modern, efficient natural gas power station, natural gas emits 50 to 60 percent less carbon dioxide (CO2) than emissions from a typical new coal plant.
How does the environment get affected by burning natural gas?When burning natural gas for energy, less carbon dioxide (CO2) and almost all other air pollutants are released into the atmosphere compared to when burning coal or petroleum products for the same amount of energy.
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what is the molarity of a hcl solution if 2.50 l is needed to reacted with 12.7 g of al according to the reaction?
The molarity of a HCl solution if 2.50 l is needed to reacted with 12.7 g of al is 5.08 M
What is molarity ?A chemical species' concentration in a solution, specifically the quantity of a solute per unit volume of solution, is measured by its molar concentration.
The number of moles per liter, denoted by the unit sign mol/L or mol/dm3 in SI units, is the most often used unit denoting molarity in chemistry.
Molarity is the number of moles of solute per liter of solution. Mole fraction is the proportion of solute moles to all other moles of substances present. Parts per thousand. grams is mass percentage, the ratio of the solute's mass to the solution's mass multiplied by 100.
Molarity ( M ) = 12.7 mol H₂SO₄ / 2.50 L
= 5.08 M
Thus, the molarity of a HCl solution if 2.50 l is needed to reacted with 12.7 g of al is 5.08 M.
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which of the cardinal principles of radiation protection is most effective in reducing exposure to the technologist during fluoroscopy?
When it comes to minimizing radiation exposure to the technician during fluoroscopy, distance is the fundamental rule of radiation safety.
Which of the following radiation protection ideas is used in the fluorescence imaging room?Anyone standing in the room during the procedure should wear lead aprons, lead barriers, and thyroid shields. By doing this, it will be made sure that both employees and spectators are shielded from the patient's scatter radiation.
Why do lead aprons exist?Everyone in a fluoroscopy room should wear a lead apron, which is the most efficient personal radiation protection method (except the patient). Depending on the energy of the X-rays (kV setting) and the lead equivalent thickness of the apron, lead aprons may reduce the dose received by more than 90% (85%-99%).
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by what factor does a 100-fold increase in the concentration of h affect the number on the ph scale?
The increase in the concentration of H ions by 100 folds, decreases the pH by 2 units.
What is pH?
pH is the measure of the acidity or basicity of the aqueous solution or any given liquid which can be indicated by numbers ranging between 0-14. 7 is the neutral, anything below 7 is acidic and anything above 7 is taken as basic. It also is a measure of H ions in any given solution.
pH can be calculated as,
pH = -log [H+]
Ration of [H+], [H+2] / [H+1] =100
Change in pH, = pH2 - pH1 = -log [H+2] / [H+1] = -log [100] = -2
Therefore, pH decreases by 2 units, when the H ion concentration is increased by 100 folds. Here negative sign indicates the decrease in the pH.
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a 97.0 ml aliquot of a 0.400 m stock solution must be diluted to 0.100 m. assuming the volumes are additive, how much water should be added?
a 97.0 ml aliquot of a 0.400 m stock solution must be diluted to 0.100 m. assuming the volumes are additive.388mL water should be added
What is a stock solution?A particular kind of homogenous mixture made up of two or more substances is known as a solution. A solute is a substance that has been dissolved in a solvent, which is the other substance in the mixture. Chemical polarity effects are engaged in the mixing of a solution at a scale that leads to interactions that are unique to solvation. When the solvent makes up a significant portion of the combination, as is frequently the case, the solution typically has the condition of the solvent. The concentration of a solution, which measures how much solute is present in a specific volume of solution or solvent, is one crucial parameter. When water is one of the solvents, the phrase "aqueous solution" is used.
By using the law of equivalence
M1 V1= M2V2
aliquot=stock solution
97.0 x 0.400 = 0.100 x V2
V2=388mL
388mL water should be added.
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24 g of methane were burned in an excess of air. What mass of water would be produced in the reaction assuming complete combustion?.
If 24 g of methane were burned completely in too much air, the reaction would result in the production of 54 g of water. Since methane is both the simplest form and the simplest alkane of hydrocarbons.
It is crucial to understand the characteristics of such a novel chemical, saturated hydrocarbons. The following list of methane's key characteristics includes: Methane's chemical structure is CH4. With a specific gravity of 0.554, methane gas is lighter than air.
An organic substance called a hydrocarbons is made completely of hydrogen and carbon. Group 14 hydrides include things like hydrocarbons.
(18 g H2O/mole H2O) * (2 moles H2O/mole CH4) * (1 mole CH4/16 g CH4) * (24 g CH4) = 54 g H2O.
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gaseous butane reacts with gaseous oxygen gas to produce gaseous carbon dioxide and gaseous water . if of carbon dioxide is produced from the reaction of of butane and of oxygen gas, calculate the percent yield of carbon dioxide.
Gaseous butane [tex](CH3(CH2)2CH3)[/tex]reacts with gaseous oxygen (O2) to produce gaseous carbon dioxide [tex](CO2)[/tex] and gaseous water [tex](H2O)[/tex]. If [tex]0.256 g[/tex] of water is produced from the reaction of [tex]1.2 g[/tex] of butane and [tex]1.6 g[/tex]of oxygen, So far i have balanced the equation to be [tex]2 (CH3(CH2)2)CH3) + 13 O2 > 8 CO2 + 10 H2O[/tex]
what is reaction yield?
The reaction yield (absolute yield) of a chemical reaction is the amount of pure and dry product yielded in a reaction. Normally, in order to measure the efficiency of a chemical reaction in organic synthesis, the relative or percentage yield (%) is calculated.To express the efficiency of a reaction, you can calculate the percent yield using this formula: %yield = (actual yield/theoretical yield) x 100. A percent yield of 90% means the reaction was 90% efficient, and 10% of the materials were wasted (they failed to react, or their products were not captured).The percentage yield of a chemical reaction is an important consideration in industrial chemistry. It can be calculated to compare the yield (quantity) of product actually obtained with what could have been obtained in theory, if all of the reactants were converted with no loss or waste.Theoretical yield is what you calculate the yield will be using the balanced chemical reaction. Actual yield is what you actually get in a chemical reaction. Percent yield is a comparison of the actual yield with the theoretical yield.to determine the percent yield: Divide the actual yield made in the lab by the calculated theoretical amount, and multiply by 100. For a synthesis – to find the overall percent yield, multiply the individual percent yields of every step by each otherto know more reaction yield about follow
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Which of the following is the end product of a natural radioactive series?
A. Stable isotopes of iodine
B. Stable isotopes of lead
C. Bismuth
D. Thorium
Answer:
Bismuth
Explanation:
The decay constant of the end product of natural radioactive series is zero because at the end of the radioactive decay, the product formed is a stable one and will not undergo any further decay in the future.
during one of the trials in this project, the initial weight of ethanol is 77 g and after the combustion, the final weight of ethanol is 10. what are the number of moles of ethanol consumed during the experiment? the molar mass of ethanol is 46.07 g/mol. report and round your answer to the first decimal place.
The number of moles of ethanol consumed during the experiment is
The combustion reaction is given as :
C₂H₅OH + 3O₂ -----> 2CO₂ + 3H₂O
the initial weight of ethanol = 77 g
the final weight of ethanol is = 10 g
initial moles = mass / molar mas
= 77 / 46.07
= 1.67 g
final moles = mass / molar mass
= 10 / 46.07
= 0.21 mol
the moles consumed = 1.67 - 0.21 = 1.46
thus, during one of the trials in this project, the initial weight of ethanol is 77 g and after the combustion, the final weight of ethanol is 10. the number of moles of ethanol consumed during the experiment. the molar mass of ethanol is 46.07 g/mol is 1.46 mol
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which question(s) can be answered from an integrated rate law that cannot be answered by other forms of the rate law? select all that apply.
The question can be answered from an integrated rate law that cannot be answered by other forms of the rate law is 1) how long it will take to use x moles per liter [A] 2) what is [A] after y minutes of reaction.
The rate law defines the relation in between rate and the concentration of the reactants. The integrated rate law describes the reaction at a specific time.
Thus, The question can be answered from an integrated rate law that cannot be answered by other forms of the rate law is 1) how long it will take to use x moles per liter [A] 2) what is [A] after y minutes of reaction.
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Which explains the change in ionization energy that occurs between removing the first and second electrons from an atom?
The ionization energy decreases because the ratio of the protons to electrons increases.
The ionization energy increases because the ratio of the protons to electrons increases.
The ionization energy decreases because the ratio of the protons to electrons decreases.
The ionization energy increases because the ratio of the protons to electrons decreases.
The following explains the change in ionization energy that occurs between removing the first and second electrons from an atom:-
The ionization energy increases because the ratio of the protons to electrons increases.
Ionization energy, also called ionization potential, in chemistry and physics, the amount of power required to dispose of an electron from an isolated atom or molecule.
Ionization energy is positive for impartial atoms, that means that the ionization is an endothermic process. Roughly talking, the closer the outermost electrons are to the nucleus of the atom, the better the atom's ionization strength. In physics, ionization strength is normally expressed in electronvolt or joules.
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Answer: B)
Explanation:
A 10. 0 ml syringe contains 0. 10 g of nitrogen gas at 0. 0 degrees celsius. What is the pressure inside the syringe? 8. 0 atm 0. 80 atm 224 atm 0. 22 atm.
The pressure inside the syringe is 0.68 Pa
What is ideal gas equation?The ideal gas law, also known as the general gas equation, is the equation of state for a hypothetical ideal gas. It has some limitations, but is a good approximation of the behavior of many gases under many conditions.
It is specified by the following formula:
PV = nRT
P = nRT/V
n = mass/ molar mass
n = 0.1/28
n = 0.003 moles
R = 8.314 J/(mol.K)
T = 0°C or 273 K
V = 10 ml
P = nRT/V
P = 0.003× 8.314×273/10
P = 0.68 Pa
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Series circuits are used in ___________ and some holiday lights.
Series circuits are mainly used in home appliances. They are also used batteries of some electrical devices other than in holiday lights.
What is series circuits?In a series circuits, the electrical components are connected in a series thus in a back to back connection. For example the light bulbs where the second leg of the first bulb is is connected to the first leg of the second bulb and so on.
Resistors are used here to control the current flow and they are also connected in a series fashion. The sum of voltage drops for all the components will be equal to the source voltage. Here we can apply the Ohm's law.
Ohm's law states that the voltage is the product of current and resistance. Series circuit is also used in batteries and in other households such as in refrigerators.
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explain why the intermolecular force is always stronger at the surface of a liquid than in the middle of the liquid.
a student performing this experiment started with a 0.384 g sample of cu wire, which was dissolved in concentrated nitric acid. after completing the series of reactions, the student isolated 0.367 g of cu. calculate the percent cu recovered by the student
95.57% is the percent Cu recovered by the student
What is nitric acid ?
Nitric acid (HNO3), a colorless, fuming, highly corrosive liquid (freezing point -42 °C [-44 °F], boiling point 83 °C [181 °F]). A chemical used in the manufacture of fertilizers and explosives. Toxic and can cause severe burns. The production and use of nitric acid was known to early alchemists. A long-used experimental procedure attributed to the German chemist Johann Rudolf Glauber (1648) was to heat potassium nitrate with concentrated sulfuric acid. , Joseph Louis Gay-Lussac and Claude-Louis Berthollet established its chemical composition.
percentage of cu recovered = isolated cu / sample of cu = 0.367/0.384=95.57 %
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what mass of naoh(s) must you dissolve in enough water to make 5.00 x 102 ml solution in order to create a 0.267 m solution?
Mass of NaOH must you dissolve in enough water to make 5.00 × 10² mL solution in order to create a 0.267 M solution is 5.32 g.
Given that :
molarity = 0.267 M
volume = 5.00 × 10² mL = 0.5 L
molarity expression is given as :
molarity = moles / volumes in L
moles = molarity × volume
moles = 0.267 × 0.5
moles = 0.133 mol
mass of NaOH = moles × molar mass
mass of NaOH = 0.133 mol × 40 g/mol
mass of NaOH = 5.32 g
Thus, Mass of NaOH must you dissolve in enough water to make 5.00 × 10² mL solution in order to create a 0.267 M solution is 5.32 g.
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What liquids can I use for my science project? Its a density project and I am trying to find liquids that are not flammable (which means it is not a liquid that catches on fire for no reason), I can use liquids like water, juice, or anything just no flammable liquids at all. It can be syrup, honey, or anything however I am using honey so yeah.
Mercury has the highest density of any liquid. At room temperature, it is the only metal that is liquid.
What is density?Density is defined as the evaluation of how closely something is packed. The relationship between a substance's mass and the amount of space it occupies is known as its density. The concept of density is crucial because it enables us to predict which substances will float and which ones will sink in a liquid.
The density depends on mass and volume of the solution. It is directly proportional to mass and indirectly proportional to volume. So the substance with more mass will have high density.
Thus, mercury has the highest density of any liquid. At room temperature, it is the only metal that is liquid.
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In three to five sentences, identify the type of bonding that would form between potassium (k) and chlorine (cl). Use electronegativity to justify this bond type. Provide the chemical formula for the resulting compound.
The chemical potassium chloride is created when one potassium ion and one chlorine ion interact in a specific ratio.
Chemical Compound: What is it?Chemical compounds are made up of several molecules, each of which is made up of an element and its constituent atoms in a specific ratio.
Covalent compounds and ionic compounds are the two different types of compounds. Ionic compounds are created by the total transfer of electrons, while covalent compounds are created by sharing electrons.
In response to our inquiry, sodium is a metal that may give an electron to chlorine in order to form an ionic bond. Because chlorine is more electronegative than sodium, it can easily absorb an electron from the latter.
The equation is balanced when
K⁺ + Cl⁻ → Kcl
Thus, it is clear from this that one potassium atom and one chlorine atom combine to produce the ionic compound potassium chloride.
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drag and drop each of the following conditions so that it matches up with the type of shift it would create in the oxygen-hemoglobin dissociation curve.
Left Shift: Lower temperature, lower 2,3-BPG concentration, lower PCO2 levels, higher pH. Right Shift: Increasing PCO2, increasing 2,3-BPG concentration, lowering pH, and raising temperature .
Explain what temperature is.Temperature is a unit used to represent hotness or coolness on any of a number of scales, including Fahrenheit and Celsius .Heat energy will logically go from a hotter (body with a higher temperature) to a colder (body with a lower temperature) according to temperature (one at a lower temperature).
What is the temperature unit?According to the International System of Units, Kelvin, which is denoted by the letter K, is the SI unit of temperature .The Kelvin scale is widely recognized or used in the scientific and technical disciplines. To measure temperature, however, the majority of the globe uses the Celsius or Fahrenheit scale.
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