The pH of blood if pco2 drops to 35.0 mmhg is 7.459
The pH of the blood can be calculated using the Henderson- Hasselbalch equation, it explains the relation between acid dissociation constant pKa and pH in biological and chemical systems.
pH = pK + log ( HCO3- / ( 0.03 * PCO2 ) )
pK is 6.1 for bicarbonate buffer system.
HCO3- = 24mm
PCO2 = 35.0 mmhg
pH = 6.1 + log ( 24 / 0.03 * 35.0 )
= 6.1 + log ( 24 / 1.05 )
= 6.1 + log 22.8571
= 6.1 + 1.3590
= 7.459
Hence, the pH of blood is 7.459
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When a known quantity of compound, at a known concentration, is added to a known volume of another compound to determine the concentration of the latter, the process is referred to as?
A titration is a method for figuring out the concentration of an unknown solution by using a solution with known concentration.
What is Titration?
Titration, commonly referred to as titrimetry, is a quantitative analysis technique that enables chemists to estimate the quantities of specific chemicals in a sample that are unknown.
A known volume of one solution of known concentration (referred to as a titrant) is slowly added to a known volume of another solution of unknown concentration (referred to as analyte) throughout the basic titration procedure until the reaction reaches neutralization.
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Nacl has a delta.hfus = 30.2 kj/mol. what is the mass of a sample of nacl that needs 732.6 kj of heat to melt completely? use q equals n delta h.. 24.3 g 82.7 g 1,407.1 g 1,417.7 g
The correct value is 1417.7 grams.
The mass of a sample of Nacl that needs 732.6 kj of heat to melt completely is 1417.7 grams.
What is Enthalpy of fusion?Enthalpy of fusion is the quantity of heat energy needed to turn a unit mass of the a solid now at melting point into such a liquids without raising the temperature.
Some key point for enthalpy of fusion of melting ice are-
The quantity of heat energy required to convert solid stuff into liquid is known as the heat of fusion (melting.)Q = mHf is the formula for calculating heat of fusion.The temperature is not a part of the equation or the computation because matter does not truly change temperature when it changes states.The fusion heat is usually a positive value, with the exception of when melting heliumCalculation for the heat required-
Nacl has a delta.hfus = 30.2 kj/mol => [tex]\Delta H_{\text {fusion }}=30.2 \mathrm{~kJ} / \mathrm{mol}[/tex]
As a result, the enthalpy of fusion for 1 mole of sample NaCl is 30.2 kJ.
Additionally, the mass of 1 mole for NaCl is 58.44 grams.
For a quantity of 58.44 grams of NaCl, 30.2 kJ of heat are required.
Consequently, 732.6 kJ heat will be required for;
[tex]\frac{58.44 g}{30.2 k J} \times 732.6 k J=1417.65 \approx 1417.7[/tex] grams of NaCl.
Therefore, the mass of a sample of Nacl that needs 732.6 kj of heat to melt completely is 1417.7 grams of NaCl.
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Calculate the standard free-energy change for the reaction at 25 ∘c. refer to the list of standard reduction potentials. 2au3 (aq) 3cr(s)↽−−⇀2au(s) 3cr2 (aq)
The standard free-energy change for the reaction at 25°C is 92640 KJ.
The change in free energy that happens when a compound is created from its constituent parts in their most thermodynamically stable states under standard-state circumstances is known as the standard-state free energy of creation.
There are 6 electrons transferred. The anode half-reaction produces 6 electrons while the cathode half-reaction uses 6 electrons.
For these types of reactions always write out the half-reactions and the appropriate oxidation numbers.
6 electrons are transferred as Au³+ has an oxidation number of 3+ and Au has an oxidation number of 0. 3 electrons are gained for each Au³+ and there are 2 Au³+ in the equation
[tex]2Au^3 (aq) +3cr(s)[/tex] ↽−−⇀ [tex]2Au(s) +3Cr^2[/tex]
Same for Cr to Cr2+ because there are 3 moles of it.
So, n = 6.
F = 96500 J/(V*mol)
where F is faraday's constant.
n = moles of electrons are transferred in this reaction.
Standard emf of the cell, E = cathode - anode.
= 1.49 - 1.33
= 0.16
Using the equation,
ΔG = -nFE
= 6 × 96500 × 0.16
= 92640 KJ
Therefore, the standard free-energy change for the reaction at 25°C is 92640 KJ.
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Hemoglobin has a much greater affinity for carbon monoxide than oxygen. which principle explains why a hyperbaric chamber (containing high levels of oxygen) can treat carbon monoxide poisoning?
Hemoglobin has a much greater affinity for carbon monoxide than oxygen. In a hyperbaric chamber (containing high levels of oxygen) can treat carbon monoxide poisoning, by displacing carbon monoxide from Hemoglobin competitively.
Hemoglobin has a much greater affinity for carbon monoxide than oxygen. This is because, a coordinate bond is formed with Carbon monoxide and Haem structure of the hemoglobin.
Carbon monoxide with Hemoglobin is called as Carboxy haemoglobin.
Presence of oxygen displaces the Carbon monoxide with Hemoglobin that is formed due to poisoning.
Hyperbaric chamber is a chamber which contains pure oxygen in a chamber. The atmospheric pressure is kept about three to four times than the normal, such that the replacement of Carbon monoxide from Haem can occur as fast as possible since this reduces the half life of the Carboxy haemoglobin.
It is advisable not to treat Carbon monoxide poisoning yourself.
Hyperbaric oxygen is used to treat the following conditions as well:
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Starting with lead (ii) carbonate describe how a solid sample of lead (ii) sulphate can be prepared
The preparation of lead (ii) sulphate from lead (ii) carbonate occurs in two steps:
insoluble lead carbonate is converted to soluble lead (ii) nitratesoluble lead (ii) nitrate is reacted with sulphuric acid to produce lead (ii) sulphate.How can a solid sample of lead (ii) sulphate be prepared from lead (ii) carbonate?Lead (ii) carbonate and lead (ii) sulphate are both insoluble salts of lead.
In order to prepare lead (ii) sulphate, a two step process is performed.
In the first step, Lead (ii) carbonate is reacted with dilute trioxonitrate (v) acid to produce lead (ii) nitrate.
PbCO₃ + 2HNO₃ → Pb(NO₃)₂ + CO₂ + H₂OIn the second step, dilute sulfuric acid is reacted with the lead (ii) nitrate to produce insoluble lead (ii) sulphate which is filtered and dried.
Pb(NO₃)₂ + H₂SO₄ → PbSO₄ + 2HNO₃In conclusion, lead (ii) sulphate is prepared in two steps.
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How many moles are in 25.3 grams of SO 3?
A.
3.16
B.
0.316
C.
2 020
D.
105
Answer:
B.) 0.316
Explanation:
To find the moles, you need to multiply the given value by the molar mass. The molar mass is made up of each element's atomic mass times their quantities. It is important to arrange the conversion in a way that allows for the cancellation of units.
Atomic Mass (S): 32.065 g/mol
Atomic Mass (O): 15.998 g/mol
Molar Mass (SO₃): 32.065 g/mol + 3(15.998 g/mol)
Molar Mass (SO₃): 80.059 g/mol
25.3 grams SO₃ 1 mole
------------------------- x ------------------------- = 0.316 moles SO₃
80.059 grams
How many moles of h2o are produced in neutralization when 1. 5 mole of mg(oh)2 reacts with h2so4?
There are 3 moles of [tex]H_{2} O[/tex] are produced in neutralization when 1. 5 mole of [tex]Mg(OH)_{2}[/tex] reacts with [tex]H_{2} SO_{4[/tex]
The neutralization reaction between magnesium hydroxide and sulfuric acid is given as,
[tex]Mg(OH)_{2} + H_{2} SO_{4[/tex] → [tex]MgSO_{4} + 2H_{2} O[/tex]
from above chemical equation , we can conclude the molar ratio = 1:2
It means two moles of water molecule is produce from one mole of magnesium hydroxide.
So, number of moles of water molecules produced from 1. 5 mole of magnesium hydroxide = 1. 5 mole× 2 = 3 moles
Therefore, number of moles of water molecules produced from 1. 5 mole of magnesium hydroxide is 3 moles.
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Think critically...
Q7. Bridges are made from materials that contract and expand as the temperature changes, so
they cannot be fastened firmly to the bank of a river or lake. The photographs below show an
expansion joint at the end of a bridge in winter and in summer.
www
(A)
(B)
Which season is shown in each picture? Explain how you know?
The season that is shown in the picture attached is that:
For the red - summer For the black - winterWhat is the season about?Metals are known to often expand due to different factor. For example, the rails of a railway are known to often expand in summer and they tend to contract in winter. This tend to make the gaps kept to be between successive rails and it is one that allow for expansion.
Note also that in Summer the expansion joint will tend to have little space as the two sides of the bridge is said to expand because of the heat and in terms of winter, it contract and there are bigger space as they tend to contract in the cold.
Hence, The season that is shown in the picture attached is that:
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10.0 grams of argon and 20.0 grams of neon are placed in a 1040.0 ml container at 31.5 °c. the partial pressure of neon is ________ atm.
The partial pressure of neon is 24.0498 atm.
To calculate the partial pressure of neon, we can use the ideal gas equation,
PV = nRT
Pne = nRT / V
Number of moles of neon = Mass of neon / Mass of one mole of neon
n = 20 / 20
n = 1 mole
R = 0.0821 L atm K-1 mol-1
T = 31.5 °C
T = 273.15 + 31.5
= 304.65 K
V = 1040.0ml
Pne = 1 * 0.0821 * 304.65 / 1040.0 * 10-3
Pne = 24.0498 atm
The partial pressure of neon is 24.0498 atm.
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Aluminum sulfate reacts with barium iodide to produce aluminum iodide and barium sulfate
Al₂(SO₄)₃ + 3BaI₂ → 2AlI₃ + 3BaSO₄
Each individual candy/isotope is the same and will take the same amount of time to decay.
a. true
b. false
It is false that ' Each individual candy/isotope is the same and will take the same amount of time to decay ' .
It is impossible to predict when an individual radioactive atom will decay .
The formula of half life day does not describe the exact amount of time that is every single atom experience before became right. The nuclear reaction follows first order kinetics and have rate constant which is independent of temperature.
The atoms of the same elements , having the same atomic number but different mass numbers is called isotopes .
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Liquid 1 reacts with liquid 2, producing a solid and a gas. using this scenario, which supports the law of conservation of mass? mass of liquid 1 mass of solid = mass of liquid 2 mass of gas mass of liquid 1 – mass of solid = mass of liquid 2 – mass of gas mass of liquid 1 – mass of liquid 2 = mass of solid mass of gas mass of liquid 1 mass of liquid 2 = mass of solid mass of gas
mass of Liquid 1 + mass of solid = mass of Liquid 2 + mass of gas mass of Liquid
The law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as system's mass cannot change, so quantity cannot be added nor removed. Hence, the quantity of mass is conserved over time.
What is Law of conservation of mass ?According to the rule of conservation of mass, mass is neither generated nor destroyed during a chemical process. For instance, when coal is burned, the carbon atom in it transforms into carbon dioxide. The carbon atom transforms from a solid to a gas, yet its mass remains constant.
The understanding that substances do not actually vanish as a result of a reaction, despite what might appear to be the case, but rather change into another material of equal mass, was made possible by the law of conservation of mass, which was essential to the development of chemistry.Learn more about Law of conservation of mass here:
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A 4.0 mg/dl creatinine standard is needed. to prepare 100 ml of the working standard. How much stock standard of 1 mg/ml creatinine is needed?
4 ml stock is needed for the standard of 1 mg/ml creatinine if a 4.0 mg/dl creatinine standard is needed to prepare 100 ml of the working standard.
Your muscles produce creatinine as a waste product during routine, everyday action. In a typical state, your kidneys remove creatinine from your blood and excrete it in urine. Creatinine can accumulate in the blood and less creatinine will be excreted in the urine if there is an issue with your kidneys.
A high amount of creatinine in the blood or urine may indicate that the kidneys are not doing a good job of filtering the blood. Although high creatinine levels do not pose a life-threatening hazard, they may be a sign of a major health problem, such as chronic renal disease.
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Nitrogen-13 has a half-life of 10 minutes. How much of a 128 mg sample would remain after 40 minutes?
The amount of nitrogen-13 sample that remained after 40 minutes has been 8 mg.
Half-life can be defined as the time required by the substance to reduce half of its initial concentration.
The half-life of Nitrogen-13 has been 10 minutes. In 10 minutes, the sample will be reduced to
of its concentration,
The total time has been 40 minutes.
The number of half-life experienced by the sample has:
Number of half-life = {Total-time}/{Half-life}
Number of half life cycles = {40}/{10}
The number of half-life cycles = 4
The sample has been reduced to 50% in the first half-life cycle,reduced to 25% in the 2nd half-life cycle, then 12.5% in 3rd half cycle and finally 6.25% by the end of 4th half cycle.
The sample remained = 6.25% of the initial concentration.
The sample remained = (6.25/100)
×128mg
The sample remained = 8 mg
Thus from above we concluded that the amount of nitrogen-13 sample that remained after 40 minutes has been 8 mg.
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Assuming an experimental value of enthalpy of –655 kj/mol and a true value of –603, what is the percent error of the experiment? use a calculator and round to the nearest hundredth as well as the absolute value of the percentage. %
8.62%
8.62% is the percent error of the experiment.
Rounding to the nearest hundredth value will be 8.620.
Determine the difference between the figures provided and divide by the actual value to find the percent error.(-655 - -603)/(-603) = 0.0862
Multiply by 100%,
(0.0862) x 100% = 8.62%
What is percent error?The percent error is the difference between the estimated value and the actual value in relation to the actual value.
What does percent error enable us to establish?Error margins are easily understood when expressed as a percentage. It reveals the size of the inaccuracy. A 3-percent error value, for example, indicates that your measured number is quite near to the true amount. A 50% margin, however, indicates that your measurement is far from the true number.The significance of percentage errorWhen you measure something in an experiment, the percentage of mistakes indicates the size of your errors. Greater proximity to the accepted or genuine value is indicated by smaller values.To learn more about percent error visit:
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I NEED HELP FOR THIS QUESTION ASAP
Explanation:
I've been having this problem, the pins you guys give on your question don't really load for me?Generating a rate law is complicated when the rate-determining step is preceded by a?
By generating a rate law is complicated when the rate-determining step is preceded by 'a' is a Equilibrium reaction.
What is rate law?The rate law shows about the rate of chemical reaction depends on reactant concentration.
According to rate law, the rate of reaction is directly proportional to the concentration of reaction which is raised to a stiochiometric coefficient which is determined experimentally.
Thus, from above we concluded that if the preceding reaction is an equilibrium, that compromises the simplicity of writing the rate law from the stiochiometry of the rate determining step will be used up in the reverse reaction of the equilibrium.
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The complex ion [cobr6]3− is a high-spin complex and absorbs light at a wavelength greater than 7. 70×102 nm. how many unpaired electrons will be present in the complex?
There are four unpaired electrons present in the complex ion [tex][CoBr_6]^3^-[/tex]
What is Crystal Field Theory (CFT)?CFT explains the breaking of orbital degeneracy in the transition metal complexes because of the presence of the ligands. It describes the strength of the metal-ligand bondsThere are two types of ligands - weak field ligands and strong field ligandsWeak field ligands form high spin complexes and strong field ligands form low spin complexesHigh spin complexes have more number of unpaired electrons Low spin complexes have less or zero unpaired electronsA complex ion [tex][CoBr_6]^3^-[/tex] is an octahedral complex. Co is the central atom to which 6 Br atoms are attached. Br is a weak field ligand and forms a high spin complex.
Electronic configuration of Co - [tex][Ar] 3d^7 4s^2[/tex]
Electronic configuration of [tex]Co^3^+ \rightarrow [Ar] 3d^6[/tex]
Electronic configuration of [tex][CoBr_6]^3^-\\[/tex] - [tex]t_2_g^4 e_g^2[/tex]
Hence, there are 4 unpaired electrons present in the complex ion [tex][CoBr_6]^3^-[/tex] .
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What is the study of living things called?
OA. Earth science
O B. Physics
O C. Chemistry
O D. Biology
Answer:
D
Explain:
Biology because normally everyone just studies under it so that is my answer for you i hope its right.
Arrange the procedural steps, from start to finish, that are required to prepare indigo from nitrobenzaldehyde and acetone in base, and then test its ability as a dye.
Acetone has α-hydrogens (on both sides) and thus can be deprotonated to give a nucleophilic enolate anion. The aldehyde carbonyl is much more electrophilic than that of a ketone, and therefore reacts rapidly with the enolate.
What is nitrobenzaldehyde?Synthesis. The synthesis of 3-nitrobenzaldehyde is achieved via nitration of benzaldehyde, which yields especially the meta-isomer. Creation allocation is about 19% for the ortho-, 72% for the meta- and 9% for the para isomers.Acetone, propanone, or dimethyl ketone, is an organic combination with the formula (CH3)2CO. It is the easiest and smallest ketone. It is a colorless, highly volatile, and combustible liquid with a characteristic aromatic odor.Nitration of benzene with conc nitric acid and conc sulphuric acid gives nitrobenzene. Chlorination with chlorine in the existence of anhydrous aluminum chloride gives meta nitro chlorobenzene.To learn more about sulphuric acid, refer to:
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What is the equilibrium vapor pressure of diethyl ether and ethanol at room temperature (approximately 20 °c)?
The equilibrium vapour pressure of diethyl ether and ethanol at room temperature or at 20°C is 442mm and 5.95kPa.
What is vapour PressureThe pressure exerted by gas in equilibrium state with a solid or liquid in container at a given temperature is termed as vapour pressure.
.Factor affecting vapour pressure:-
Surface area:
The surface area of solid of liquid which is in contact with the gas do not much affect the vapour pressure.
Type of molecules:
Greater the intermolecular face small will be smaller will be vapour pressure, if lesser the force then greater will be the vapour pressure.
Temperature:
At high temp.,more molecules has enough energy to escape from the liquid or solide. At lower temp. feuer molecule escape enhance lesser tha vapour pressure.
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What type of response to chemical exposure is an immediate or rapid harmful reaction?.
An acute effect is an immediate or rapid harmful reaction to a exposure.
A chronic effect is a permanent/ long-lasting consequence from exposure to a single dose or to repeated lower doses of a harmful substance.
What is an acute effect?
Acute (short-term) effects show up immediately or soon after exposure to the chemical. They may be minor, like nose or throat irritation, or they could be serious, like eye damage or passing out from chemical vapors. It is an adverse effect on a human or animal body, with severe symptoms developing rapidly and coming quickly to a crisis.
What is a acute effect example?
Examples of acute health effects include dizziness, skin irritation, and throat irritation. Keep in mind that a chemical may cause both acute and chronic effects.
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Which does not apply to dihydroxyacetone?
a. ketose
b. triose
c. chiral
d. water-soluble
What is the optimum ph of a sodium formate/formic acid buffer? (for formic acid, ka = 1. 7 × 10–4. )
The optimum pH of formic acid - formate buffer is 3.75
What is pH? pH is a measure of how acidic/basic water is. The range goes from 0 - 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.What is Buffer ?
A substance or a solution which resists any changes in pH, when acid or alkali is added to it.
pH = pKa + log[base] / [acid]
Considering equimolar concentration of acid and base
pH = 3.75 + log(x)/(x)
pH = 3.75 + log (1)
pH = 3.75 + 0
pH = 3.75
Hence,
The optimum pH of formic acid - formate buffer is 3.75
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Compared with the energy it takes to separate oxygen and hydrogen from water, how much energy is released when they recombine?.
The same amount of energy is released when they recombine.
How much energy is released when water is formed and split?The decomposition of water:
H₂O → H₂ + O₂ Δ = +285.8 kJ/mol
The formation of water:
H₂ + O₂ → H₂O Δ = -285.8 kJ/mol
Endothermic water decomposition requires 285.8 kJ of energy input per mole of degraded water. One mole of water is created from hydrogen and oxygen in the opposite reaction, which is exothermic and produces 285.8 kJ of energy. The energy level is the same, but the energy change sign is different.
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How many coulombs passed through the solution if 11. 5 a of current was applied for 4. 00 h?
There are 165600 coulombs passed through the solution if 11. 5 A of current was applied for 4. 00 h.
Calculation,
Formula used :
Q = It
Where Q = charge passing through the solution = ?
I = current passed through the solution = 11. 5 A
and , t = time = 4. 00 h
Putting the value of current , and time
Q = 11. 5×4. 00 h =11. 5× 46×3600 A×s = 165600 coulombs
The SI unit of charge is coulombs.
The SI unit of current is ampere.
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GIVE BRAINLIEST!!!
(if answer is correct and with explanation)
How could you tell a Ca(NO3)2 solution from a Zn(NO3)2 solution?
Answer:
you better give me brainliest
Explanation:
Zinc nitrate and calcium nitrate solution can be distinguished by reaction with ammonium hydroxide. Zinc forms a white gelatinous ppt. whereas there is no precipitation of calcium hydroxide even with excess of ammonium hydroxide
What is the daughter nucleus (nuclide) produced when 59 co undwegoes positron decay?
The 59 co is 100 % stable nuclei that's why it will not show any kind of decay, have not any daughter nucleus.
The process of radioactive decay describes how an unstable atomic nucleus releases energy through radiation. A substance that has unstable nuclei was regarded as radioactive. Alpha, beta, as well as gamma decay, are three of the most poses significant of decay, as well as they all entail the emission of one or maybe more particles.
Every atom strives to have the greatest degree of stability. When the proportion of protons as well as neutrons in the atomic nucleus is out of balance, instability results in radioactive decay. In essence, the nucleus contains too much energy to keep all the nucleons together.
Therefore, the 59 co is 100 % stable nuclei that's why it will not show any kind of decay, have not any daughter nucleus.
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If a hydrogen atom has its electron in the n = 3 state, how much energy in ev is needed to ionize it?
The energy of the hydrogen atom will be -0.85 ev.
Ionization, also known as ionization, would be the phenomenon by which an atom or molecule gains or loses electrons to acquire a negative and positive charge, frequently in conjunction with those other chemical changes. Ions are the name for the electrically charged molecular or atom that results.
These chemicals are known as ionic compounds, with table salt serving as an example. Ionization would be the process of removing electrons from such an element as well as a molecule as well as the dissociation of an ionic material, such as salt, itself into the individual ions in a solution like water.
The energy of hydrogen atom will be calculated by using the formula:
[tex]E_{n} = -13.6 ev / n^{2}[/tex]
where, [tex]E_{n}[/tex] = energy of nth level, n is the state.
It is given that, n = 3 .
Now put the value of n in above equation.
[tex]E_{4} = -13.6 ev / 4^{2}\\E_{4} = -13.6 ev / 16\\E_{4} = -0.85 ev[/tex]
Therefore, the energy of the hydrogen atom will be -0.85 ev.
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A bug walking on the surface of a puddle is depending on what property of water? high surface tension because of the attraction between water molecules capillary action of water molecules to narrow objects such as bug legs low density of liquid water because of the bent molecular shape adhesion of water molecules to nonpolar structures such as hair and skin
High surface tension because of the attraction between water molecules helps bugs walk on the surface of the water.
How does surface tension help insects walk on water surface?Surface tension is important for insects that walk on water. They would sink without it. When compared to air molecules, water molecules are more strongly attracted to one another. Due to cohesion, this makes them attract and cling to one another strongly in a body of water. The water molecules between the molecules at the water's surface are more strongly attracted to one another because they do not have water molecules surrounding them on all sides.
As a result, there is an inward force that forms a "film" at the surface and causes the water to act as though a thin membrane were covering it. Surface tension is the term for this phenomena.
Surface tension can be used to the advantage of some insect and spider species. They don't break the water's surface when they stand on it because their negligible weight is insufficient to dissipate the force of surface tension. Instead, they make dimples or indentations in the surface with their feet, which rebound to move the insect ahead. This enables them to move swiftly over ponds, lakes, and rivers in search of prey.
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