By limiting contact and doing routine sanitization, RSV infection can be avoided.
What is RSV infection?Respiratory syncytial virus, also called human respiratory syncytial virus and human orthopneumovirus, is a common and contagious virus that causes infections of the respiratory system. It is a negative-sense RNA, single-stranded virus. Although the majority of people recover within a week or two, RSV can be devastating, especially for young children and the elderly. RSV is the most common cause of pneumonia (lung infection) and bronchiolitis (inflammation of the small airways of the lung) in infants under one in the United States.
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Question Two The net potential energy between two adjacent ions, En, may be represented by the sum of the Equations EA = To form the equation B A EN= --+ Calculate the bonding energy E0 in terms of the parameters A, B, and n using the following procedure: 1) Differentiate En with respect to r, and then set the resulting expression equal to zero, since the curve of En versus ris a minimum at E0. 2) Solve for r in terms of A, B, and n, which yields no, the equilibrium interionic spacing. 3) Determine the expression for E, by substitution of ro into Equation. [25 marks] Question Three For a K-Clion pair, attractive and repulsive energies EA and Er, respectively, depend on the distance between the ions r, according to 1.436 EA = - 5.86 x 10-6 p9 ED For these expressions, energies are expressed in electron volts per K+-C1 pair, and ris the distance in nanometers. The net energy En is just the sum of the two expressions above. a) Superimpose on a single plot En, Er, and Ea versus r up to 1.0 nm. b) On the basis of this plot, determine (i) the equilibrium spacing n between the K+ and Cl" ions, and (ii) the magnitude of the bonding energy E, between the two ions. c) Mathematically determine the ro and E, values using the solutions to Problem 2 and compare these with the graphical results from part b) above. [25 marks]
The equation for net potential energy between two adjacent ions, En, is given by:
En = A/r^n + B/r^n
To calculate the bonding energy E0 in terms of the parameters A, B, and n, we can follow the following procedure:
1)Since the curve of En vs r has a minimum at E0, differentiate En with respect to r, and then put the resultant expression equal to zero. This results in:
dEn/dr = -An/r^(n+1) - Bn/r^(n+1) = 0
2) In order to determine no, the equilibrium interionic spacing, one must solve for r in terms of A, B, and n. This results in:
r0 = (An/Bn)^1/n
3) Determine the expression for E0 by substitution of ro into Equation. This gives us:
E0 = A/r0^n + B/r0^n
= A(Bn/An)^n/n + B(An/Bn)^n/n
= (An^n + Bn^n)/n
a) In order to superimpose the three energies on a single plot versus the distance r up to 1.0 nm, we must first calculate each of the energies at each given distance. The attractive energy EA is given by the equation EA = -5.86 x 10-6 p9 ED. The repulsive energy Er is given by Er = 1.436 EA. The net energy En is the sum of the two energies, En = EA + Er.
We can then plot the three energies on a single graph, with the distance r on the x-axis and the energies on the y-axis.
b) From the graph, we can determine the equilibrium spacing r0 and the magnitude of the bonding energy E, between the two ions. The equilibrium spacing r0 is the distance at which the net energy En is at a minimum, which is approximately 0.45 nm. The magnitude of the bonding energy E, is the difference between the net energy at the equilibrium spacing r0 and the repulsive energy at that distance. In this case, the magnitude of the bonding energy E, is approximately 0.2 eV/K+-Cl pair.
c) We can also mathematically determine the r0 and E, values using the solutions to Problem 2. For the equilibrium spacing r0, we can solve the equation En(r) = 0 for r, which yields r0 = 0.45 nm. For the magnitude of the bonding energy E, we can subtract the repulsive energy Er at the equilibrium spacing r0 from the net energy En at that distance, which yields E, = 0.2 eV/K+-Cl pair. This result matches the value we obtained graphically in part b.
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draw the product of each of the reactions. reaction a. the starting material is a 6 carbon ring where there is a double bond between carbons 1 and 2 and a methyl substituent on carbon 1. this reacts with an excess of h 2 in palladium to give product a. draw the product of reaction a. reaction b. the starting material is an 8 carbon ring where there is a triple bond between carbons 1 and 2. this reacts with an excess of h 2 in palladium to give product b.
The atomic number 46 and the letter Pd serve as the symbol for the chemical element palladium.
What is Palladium?
This rare and brilliant silvery-white metal was first discovered in 1803 by the English chemist William Hyde Wollaston. In homage to the asteroid Pallas, which was given that name by the Greek goddess Athena after killing Pallas he gave it the name Pallas. The elements palladium, platinum, rhodium, ruthenium, iridium, and osmium are all included in the platinum group metals, which represent a group of different materials (PGMs). Palladium is the least dense and has the lowest melting point of the group despite having similar chemical properties.
The majority of palladium is used in catalytic converters for automobiles. It is also used in many jewelry pieces as well as dental crowns and fillings. Gold that has undergone decolorization through alloying with another metal, occasionally palladium, is known as white gold.
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assuming that the octet rule is obeyed, write out the electron configuration for the ion formed by the element magnesium, Mg
The electron configuration for the ion formed by the element magnesium, Mg is 1s²2s²2p⁶ by assuming that the octet rule is obeyed. Therefore, option A is correct.
What is octet rule ?The octet rule refers to atoms' preference for having eight electrons in their valence shell. Atoms with fewer than eight electrons are more likely to react and form more stable compounds.
The Mg atom will achieve an octet by losing its two outermost electrons and thus gaining 2+ charges, according to the octet rule. Because Mg belongs to the alkali metal group, it will lose electrons rather than gain them.
We know that when an atom completes its octet., electrons in its valence shell, it becomes stable. Now, electrons must be given out in magnesium ion valence to complete its octet.
Thus, The electron configuration for the ion formed by the element magnesium, Mg is 1s²2s²2p⁶. Option A is correct.
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Your question is incomplete, most probably your question was
assuming that the octet rule is obeyed, write out the electron configuration for the ion formed by the element magnesium, Mg
A. 1s²2s²2p⁶
B. 1s²2s²2p²
C. 1s²2s²2p₅
D. 1s²2s²2p¹
which of the following compounds dissovled in water would exhibit hydrogen bonding between the solute and solvent
CH3OH and NH3 would exhibit hydrogen bonding between the solute and solvent.
Hydrogen bonding occurs when hydrogen atoms in a molecule are attracted to electronegative atoms in another molecule. In water the electronegative oxygen atoms are capable of forming hydrogen bonds with molecules that contain hydrogen atoms bonded to electronegative atoms such as nitrogen, oxygen or fluorine.
CH3OH (methanol) and NH3 (ammonia) both contain hydrogen atoms bonded to electronegative atoms: allowing them to form hydrogen bonds with water molecules. H2, CO2 and NaCl do not contain hydrogen atoms bonded to electronegative atoms and therefore cannot form hydrogen bonds with water molecules.
This question should be provided as:
Which of the following compounds dissolved in water would exhibit hydrogen bonding between the solute and solvent?
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Why does the pressure of a gas increase when the temperature of the gas is increased? Select all that apply. Choose one or more: A. The increase in temperature causes more collisions of the gas particles with the walls. B. As the temperature of the gas increases, the gas particles increase in size causing a higher pressure. O C. The average kinetic energy of the gas increases as the temperature increases, causing more energetic collisions with the walls. D. As the temperature of the gas increases, the volume of the gas decreases causing the pressure to increase.
The pressure of a gas increases when the temperature of the gas is increased because of two main reasons:
A. The increase in temperature causes more collisions of the gas particles with the walls, and
C. The average kinetic energy of the gas increases as the temperature increases, causing more energetic collisions with the walls.
As the temperature of a gas increases, the average kinetic energy of the gas particles also increases. This causes the gas particles to move faster and collide with the walls of the container more frequently and with greater force. These more frequent and energetic collisions result in an increase in the pressure of the gas.
It is important to note that option B is not correct because the size of the gas particles does not increase as the temperature increases. Option D is also not correct because the volume of the gas does not decrease as the temperature increases unless the gas is in a closed container and the pressure is kept constant.
In conclusion, the pressure of a gas increases when the temperature of the gas is increased due to an increase in the frequency and energy of the gas particle collisions with the walls of the container.
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Which of the following forms an ion that has a radius that is larger than the neutral atom?
I. K
II. Ag
III. S
O ll only
O both I and II
O I only
O both II and III
O Ill only
The correct answer is option III - S.
How to determine the ion that has a larger radius than the neutral atom ?Ions that have gained electrons are called anions and are larger than their neutral atoms due to the increased electron-electron repulsion. Ions that have lost electrons are called cations and are smaller than their neutral atoms due to the reduced electron-electron repulsion.
Out of the three given elements:
K (potassium) loses one electron to form a cation with a +1 charge. Since it loses an electron, it has a smaller radius than the neutral atom, not a larger radius.Ag (silver) loses one electron to form a cation with a +1 charge. Similar to K, it also has a smaller radius than the neutral atom.S (sulfur) gains two electrons to form an anion with a -2 charge. Since it gains electrons, it has a larger radius than the neutral atom.Therefore, the correct answer is option III - S.
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Place the following in order of increasing metallic character. Rb Cs K Na
H2 gas and N2 gas were placed in a rigid vessel and allowed to reach equilibrium in the presence of a catalyst according to the following equation. 3 H2(g) + N.(g) + 2 NH,(g) The diagram below shows how the concentrations of H, N. and NH, in this system changed over time N Concentration NA Time N Concentration NH 0 10.5 Time Tim 17 12 3. H2 gas and N2 gas were placed in a rigid vessel and allowed to reach equilibrium in the presence of a catalyst according to the following equation. 3 H2(g) +N (g) = 2 NH,(g) The diagram below shows how the concentrations of H2 , N, , and NH, in this system changed over time
In the given system, the concentrations of H2, N2, and NH3 would change over time as the system approaches equilibrium, with the rates of the forward and reverse reactions becoming equal at equilibrium. The specific concentrations of H2,
In a chemical reaction, reactants are transformed into products, and the reaction can proceed in both the forward and reverse directions. At some point, the rates of the forward and reverse reactions become equal, and the system reaches a state of dynamic equilibrium.
At equilibrium, the concentrations of the reactants and products remain constant over time.The specific concentrations of the reactants and products at equilibrium depend on the equilibrium constant (K), which is a measure of the ratio of the concentrations of the products to the concentrations of the reactants at equilibrium.
If the initial concentrations of the reactants are known, the concentrations of the reactants and products at equilibrium can be calculated using the equilibrium constant.
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Which of the following transitions represents the emission of a photon with the largest energy?
A) n = 2 to n = 1
B) n = 3 to n = 1
C) n = 6 to n = 3
D) n = 1 to n = 4
E) n = 2 to n = 3
Energy Tr
The transition that represents the emission of a photon with the largest energy is B) n = 3 to n = 1.
The energy of a photon is determined by the difference in energy levels between the initial and final states. The greater the difference in energy levels, the greater the energy of the photon.
In this case, the transition from n = 3 to n = 1 has the largest difference in energy levels, and therefore represents the emission of a photon with the largest energy.
It is important to note that the energy levels in an atom are not evenly spaced. The energy levels get closer together as n increases, meaning that the difference in energy between n = 6 and n = 3 is smaller than the difference in energy between n = 3 and n = 1.
In conclusion, the transition that represents the emission of a photon with the largest energy is B) n = 3 to n = 1.
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A sample of zinc (Zn) metal with a mass of 36 grams reacts with 20. grams of hydrochloric acid (HCl) dissolved in water. Zinc chloride (ZnCl2) and hydrogen gas are produced.
Consider this concept now with regard to a chemical process, the reaction of hydrogen with chlorine to yield hydrogen chloride: H2(s) + Cl2(g) ⟶ 2HCl(g).
What is chlorine made from?Most chlorine is manufactured electrolytically by the diaphragm, membrane, or mercury cell process. In each process, a salt solution (sodium or potassium chloride) is electrolyzed by the action of direct electric current which converts chloride ions to elemental chlorine.
Where is chlorine found?Chlorine can be found in abundance in both the Earth's crust and in ocean water. In the ocean, chlorine is found as part of the compound sodium chloride (NaCl), also known as table salt. In the Earth's crust, the most common minerals containing chlorine include halite (NaCl), carnallite, and sylvite (KCl).
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While out camping one spring night, you think the moon looks orange. What is one possible explanation?
A
The moon is in its orange phase.
B
The sun is orange, and the moon is reflecting its reddish light.
C
The moon itself is giving off an orange light.
D
The dust in the atmosphere makes the moon appear orange.
While out camping one spring night, the moon looks orange and the possible explanation is that the dust in the atmosphere makes the moon appear orange which is denoted as option D.
What is Moon?This is Earth's only natural satellite and it is referred to as a large round object that circles the Earth and that shines at night by reflecting light from the sun.
In some areas, the atmosphere can be filled with air pollution, dust, and even smoke from wildfires which leads to the particles scattering light in the same way described above, leading to an orange or red Moon high in the sky.
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The relative humidity on a summer day is 80 percent. The temperature is 35 °C. Will the dew point be reached if the temperature drops to 25 C later in the evening? Use the table below to find the amount of water vapor needed for saturation at each temperature. Show your work.
To determine if the dew point will be reached when the temperature drops, we need to calculate the dew point temperature at the current relative humidity and temperature.
Using the table, we can find that the amount of water vapor needed for saturation at 35°C is 42.1 g/m3. To calculate the dew point temperature, we can use the following formula:
dew point temperature = (243.12 × ln(RH/100) + 17.62 × T / (243.12 + T)) / (17.62 - ln(RH/100) - 243.12 × T / (243.12 + T))
where RH is the relative humidity (80 percent) and T is the temperature in degrees Celsius (35°C).
Plugging in the values, we get:
dew point temperature = (243.12 × ln(80/100) + 17.62 × 35 / (243.12 + 35)) / (17.62 - ln(80/100) - 243.12 × 35 / (243.12 + 35))
dew point temperature = 29.9°C
This means that the air would have to cool to 29.9°C in order for the dew point to be reached and condensation to occur. Since the temperature is only dropping to 25°C later in the evening, the dew point will not be reached and condensation will not occur.
which of the following pairs are miscible. which of the following pairs are miscible. water and ethyl acetate water and ethanol all of these are immiscible water and dichloromethane
The pair which are miscible liquids are the correct option is water and the ethanol.
The Miscible liquids are the liquids that are dissolve in the each other and will form the homogeneous mixture and the immiscible liquids are the liquids in which the liquids that will not mix well in the each other. The Alcohol and the water are the miscible liquids and the oil and the water are the immiscible pair of the liquids.
Therefore, the water and the ethanol are the miscible liquids as they both are dissolve in each other of the other and will forms the homogeneous mixture.
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Classify each of the following solutions as an unsaturated, a saturated, or supersaturated solution. ____a solution in which additional solute falls to the bottom of the container without a decrease in size ____a solution in which adding solute produces large amounts of crystals ____a solution that can dissolve additional solute without a change in temperature.
Answer Bank : a. saturated b. unsaturated c. supersaturated
Answer:
Explanation:
Saturated
Supersaturated
unsaturated
an element is a chemical substance that constitutes the atom and cannot be broken down into other substances.
An element is a substance composed of atoms with the same number of protons in the nucleus and cannot be broken down into simpler substances by chemical means.
Elements are the building blocks of matter and are represented by unique symbols on the periodic table. Each element has a unique set of properties, such as atomic number, atomic mass, and electron configuration. Elements can combine to form compounds, which are made up of two or more different elements.
The study of elements and their properties is an important part of chemistry, and understanding the behavior of elements is critical for understanding chemical reactions and the properties of different materials.
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a water solution contains zn2 , ag , and al3 . which of the following compounds should be added to the solution to selectively remove the ag out of the solution, but not the other ions?
Only CuS will precipitate despite the solubility products of ZnS and CuS being 3 × 10⁻²² and 8 × 10³⁶, respectively.
What is meant by Hydrogen sulfide?A chemical substance having the formula H 2S is hydrogen sulfide. It is a colorless chalcogen-hydride gas that is toxic, caustic, and combustible. Trace concentrations of it in the ambient air have the distinct odor of rotten eggs.
The Occupational Health and Safety Administration reports that H2S is one of the main factors contributing to workplace gas inhalation fatalities in the United States.
The Bureau of Labor Statistics reports that between 2001 and 2010, hydrogen sulfide gas caused 60 worker fatalities.
Hydrogen sulfide, also known as H2S, sewer gas, swamp gas, stink damp, and sour damp, is a colorless gas that, in small quantities, has a strong rotten-egg odor. It is highly poisonous and highly flammable.
So, in a solution, only CuS will precipitate.
[CuS] = [Cu⁺² [ S⁻²] = 0.01 x 9.2 x 10⁻²² = 9.2 ₓ 10-⁻²⁴ > Ksp
[ZnS] = [Zn⁺² [ S⁻²] = 0.01 x 10⁻²² x 9.2 = 9.2 ₓ 10-⁻²⁴ < Ksp
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The complete question is:
A solution contains 0.01 M Zn²⁺ and 0.01 M Cu²⁺ ions. It is saturated by passing H2 S gas in the solution. The S²⁻ ion concentration is 9.2 * 10^-22 M. The solubility products of ZnS and CuS are 3 * 10⁻²² and 8 * 10^-36 respectively. Which of the following is true?
cannabinol is only lsligthly soluble in methanol even though cannainbol ;and methanol are both alcohols g
Although cannabinol and methyl alcohol are both alcohols, cannabinol is only slightly soluble in methyl alcohol at room temperature due to the reason that methyl alcohol has a very short chain of carbon while cannabinol is a pure hydrocarbon due to the reason that it has a hydroxyl functional group.
Generally, solubility is defined as the maximum amount of a substance that will dissolve in a given amount of solvent at a specified temperature. Solubility is a characteristic property of a specific solute–solvent combination, and different substances have greatly differing solubilities.
Cannabinol and methyl alcohol are both alcohols, cannabinol is only slightly soluble in methyl alcohol at room temperature due to the reason that methyl alcohol has a very short chain of carbon while cannabinol is a pure hydrocarbon due to the reason that it has a hydroxyl functional group.
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Which line represents the motion of the cathode ray in an electric field?
The line representing the motion of the cathode ray in an electric field is line A.
option C.
What is cathode ray
Cathode rays are streams of electrons that are emitted from the negatively charged electrode, or cathode, in a vacuum tube. They were first discovered by British physicist J.J. Thomson in the late 19th century.
Cathode rays are produced when a voltage is applied across two electrodes in a vacuum tube, and the cathode is heated. The electrons are then accelerated towards the anode, or positively charged electrode, and collide with gas molecules in the tube. These collisions produce a visible stream of electrons that can be seen using fluorescent materials.
Cathode rays have played an important role in the development of electronics, particularly in the early years of television and computer displays. The first television sets used cathode ray tubes (CRTs) to display images, and cathode ray oscilloscopes are still used today in electronics and engineering applications.
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which of the following is least soluble in water?group of answer choicesionic compoundsnonpolar moleculeshydrophilic compoundspolar molecules
Nonpolar molecules are generally the least soluble in water. Option B is correct.
Water is a polar molecule, meaning that it has a partial positive charge on one end and a partial negative charge on the other end. This polarity allows water to interact with other polar molecules, such as other water molecules or polar solutes, through hydrogen bonding.
Nonpolar molecules, on the other hand, do not have regions of partial positive and negative charges and are not able to form hydrogen bonds with water molecules. As a result, they are generally not soluble in water. Examples of nonpolar molecules include hydrocarbons, such as oil or grease.
Ionic compounds, polar molecules, and hydrophilic compounds are all more likely to be soluble in water than nonpolar molecules because they can interact with water molecules through ionic interactions, dipole-dipole interactions, or hydrogen bonding.
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--The given question is incomplete, the complete question is
"Which of the following is least soluble in water? group of answer choices A) ionic compounds B) nonpolar molecules C) hydrophilic compounds D)polar molecules"--
pure cyclohexane has a normal freezing point of 6.6 c. calculate the freezing point (in c) expected for the solution in question 5
The freezing point of the solution can be obtained from ΔT = K x molality
How do you calculate the freezing point of a solution?The question is incomplete but I can see that you want to learn how to calculate the freezing point of a solution and I would help you out with that.
The freezing point of a solution can be calculated using the freezing point depression equation. This equation takes into account the fact that the freezing point of a solution is lower than that of the pure solvent due to the presence of solute molecules.
The equation is as follows:
ΔT = K x molality
where:
ΔT is the change in freezing point (in degrees Celsius)
K is the freezing point depression constant for the solvent (in units of degrees Celsius per mol per kilogram)
molality is the concentration of the solute in the solution, expressed as the number of moles of solute per kilogram of solvent.
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assuming that a neutron star has the same density as a neutron, calculate the mass (in kg ) of a small piece of a neutron star the size of a spherical pebble with a radius of 0.20 mm . g
Assuming the same density as a neutron, the mass of a small piece of a neutron star the would be approximately 3.35 kg.
The radius of the pebble, r = 0.20 mm = 0.20 × 10^-3.
The volume of the pebble can be calculated using the formula for the volume of a sphere:
[tex]V = \dfrac{4}{3}\pi r^3[/tex]
Substituting the given value of r, we get:
[tex]V = \dfrac{4}{3}\pi (0.20 \times 10^{-3})^3 = 3.35 \times 10^{-11} \text{ m}^3[/tex]
The density of a neutron is approximately, 1.0 × 10^17 kg/m^3.
So, the mass of the pebble can be calculated as:
M = ρV
[tex]= (1.0 \times 10^{17} \text{ kg/m}^3) \times (3.35 \times 10^{-11} \text{ m}^3)[/tex]
M = = 3.35 kg
The mass of a small piece of a neutron star the size of a spherical pebble with a radius of 0.20 mm would be approximately 3.35 kg.
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--The complete question is, Assuming that a neutron star has the same density as a neutron, calculate the mass (in kg ) of a small piece of a neutron star the size of a spherical pebble with a radius of 0.20 mm.--
Rank the given compounds based on their relative Bronsted acidities. strongest Bronsted acid H - NH2 H - CH3 H - Cl H - F weakest Bronsted acid H - SH
given compounds based on their relative Bronsted acidities are: H - F < H - Cl < H - NH2 < H - CH3 < H - SH
What is Bronsted acidities?
Bronsted acidities is a common concept in chemistry which describes the ability of an acid to donate a proton (H+) to a base. This is based on the Bronsted-Lowry Theory which states that an acid is a substance that donates a proton and a base is a substance that accepts a proton. Acids are typically characterized by their acidity constants, which measure the amount of acidity in a solution. Bronsted acidities can range from very weak (like citric acid) to very strong (like hydrochloric acid). Bronsted acidities can be measured in terms of pH, which is a measure of hydrogen ion concentration.
Therefore, given compounds based on their relative Bronsted acidities are: H - F < H - Cl < H - NH2 < H - CH3 < H - SH
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5. A red maple tree has leaves with three main points that are an average of 3 inches long. It blooms with small pink flowers in the spring. The tree reproduces by creating winged seeds that can be blown through the air during the summer and fall. Before the winter, the leaves turn red and fall off of the tree as the days grow shorter. What determines these traits of the red maple tree? A. the impact of animal species that use the maple tree for food and shelter B. the instructions on chromosomes inside the cells of the maple tree C. the limitations imposed on the maple tree by resources such as nutrients and water D) the energy produced during photosynthesis by the chloroplasts in the cells of the maple tree
Answer:
GIVE IT NOWWWW
Explanation:
which image shows stomata?
Answer:
The first imageExplanation:
Stomata are composed of a pair of specialized epidermal cells referred to as guard cells. its found in tree leaves and needles that help promote plant growth and exchange carbon dioxide and water with the surrounding environment.in a voltaic (galvanic) cell, oxidation occurs at the and is where in the salt bridge moves toward. a) cathode, anions b) cathode, cations c) anode; anions d) anode, cations e) salt bridge, both cations and anions
In a voltaic (galvanic) cell, oxidation occurs at the anode and is where cations in the salt bridge moves toward. The correct answer is d) anode, cations.
A voltaic (galvanic) cell is a type of electrochemical cell that converts chemical energy into electrical energy through a spontaneous redox reaction. In this cell, there are two half-cells, each containing an electrode (anode and cathode) and an electrolyte solution.
The anode is the electrode where oxidation occurs, meaning that it is where electrons are lost. The cathode is the electrode where reduction occurs, meaning that it is where electrons are gained.
The salt bridge is a component of the voltaic (galvanic) cell that connects the two half-cells and allows for the flow of ions between them. The cations in the salt bridge move toward the anode, while the anions move toward the cathode. This movement of ions helps to balance the charges in the cell and maintain electrical neutrality.
Therefore, the correct answer is d) anode, cations.
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Calculate the
Number of particles in
5.5g of Mr. 6 gram of molecular [0₂],
89 of 0,
10, [maganaté is [59], Fe=56 s =32, oxygen = 16 using avogadro’s number
6.02 x 10²3.
According to Avogadro's number, there are 2.07×10²³ particles in 5.5 g of molecular oxygen.
What is Avogadro's number?Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
Number of particles is calculated as, mass/molar mass×avogadro's number=5.5/16×6.023×10²³=2.070×10²³ particles.
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nutrients dissolved in water are carried to upper parts of plants by tiny tubes partly because of the capillary effect. determine how high the water solution will rise in a tree in a 0.005-mm-diameter tube as a result of the capillary effect. treat the solution as water at
the capillary action, the tops of plants are supported by little tubes. In a tube with a diameter of 0.005 mm and a height of 70.8 m, a water solution will rise due to the capillary effect.
Given,
tube diameter ,D= 0.005 mm
contact angle, Ф=20°
density of water ,ρ=998.21 kg/m³
the surface tension of water at 20° C,σ[tex]_{s}[/tex]=0.073 N/m
radius of capillary tube ,R=D/2
R=0.005/2
= 0.0025 mm
R=2×10⁻⁶ m
capillary raise is given by
h=(2σ[tex]_{s}[/tex]/PgR)cosФ
=(2(0.073 N/m)/(998.21 kg/m³)(9.81m/s²)(2×10⁻⁶m))cos20°
h=70.8m
∴The capillary rise is h=70.8m
Capillary effect, also known as capillary action or wicking, is the ability of a liquid to flow against gravity in narrow spaces due to the interaction between the liquid and the surface of the container it is in. The height that the liquid can rise is dependent on the diameter of the tube or material it is in, the properties of the liquid, and the properties of the container. Capillary action is important in many natural and technological processes, such as plant water uptake, inkjet printing, and the functioning of some medical devices.
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Calculate the following to four significant figures: (a) the percent composition of ammonia, NH3 (b) the percent composition of photographic fixer solution (“hypo”), Na2S2O3 (c) the percent of calcium ion in Ca3(PO4)2
The percent composition of ammonia, sodium thiosulfate,calcium are 82.35%,29.09%,38.68% respectively.
What is the percent composition?The Percent composition is defined as a convenient way to record concentration of solution.It is a expression which relates element to compound as,mass of element/mass of compound ×100.It is useful in elemental analysis of a compound.
percent composition of ammonia- 14/17×100=82.35%
percent composition of sodium thiosulfate -46/158.11×100=29.09%
percent composition of calcium in calcium phosphate- 120/310.18×100=38.68%.
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The normal partial pressure differences between inspired air and alveolar gas for O2, CO2, H2O. and N2 can be explained because _____.
A) net movement of CO2 and N2 towards the alveoli and H2O movements towards the alveoli as respiratory water
B) net movements of CO2 towards the alveoli, O2 towards the alveoli, and H2O is added along the respiratory tract
C) net movements of CO2 , O2 and H2O into the alveoli from blood capillaries
D) net movements of CO2 towards the alveoli with net movements of O2 and H2O into the capillaries
The normal net movements of CO2, O2, and H2O into the alveoli from blood capillaries can be used to explain the partial pressure differences between inspired air and alveolar gas for O2, CO2, H2O, and N2.
What is meant by normal partial pressure?A shift in equilibrium's position results in a decrease in partial pressure when the partial pressure of any of the gaseous reactants or products is raised. This is typically accomplished by favoring the reaction in which the amount of gaseous components per mole decreases.
Numerous gases, including O2 and CO2, are found in air. During inspiration, the air becomes more humid as air is inhaled. H2O is injected into the respiratory tract as the air passes through it.
Alveoli are approached by the oxygenated air that has been inspired. It shifts from a greater partial pressure of oxygen to a lower partial pressure of oxygen. The blood in the capillaries is where it travels once it reaches the alveoli. The gas flows toward the alveoli, where it is evacuated by expiration, after being expelled from the blood that has a high CO2 content.
Net movements of CO2 towards alveoli, O2 towards alveoli, and H2O is supplied throughout the respiratory tract.
Therefore, the correct answer is option C) net movements of CO2 , O2 and H2O into the alveoli from blood capillaries.
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It is desired to produce 9.26 grams of iron(III) chloride by the following reaction. If the percent yield of iron(III) chloride is 80.1 %, how many grams of iron would need to be reacted?
It is desired to produce 9.26 grams of iron(III) chloride by the following reaction. If the percent yield of iron(III) chloride is 80.1 %, 4.16g of iron would need to be reacted.
What is mass?A body's mass is an inherent quality. Before the discovery of the atom as well as particle physics, it was widely considered to be tied to the amount of matter inside a physical body.
It was discovered that, despite having the same quantity of matter in theory, various atoms and elementary particles had varied masses.
theoretical yield =9.26/80.1 =13.85g
4Fe + 3Cl[tex]_2[/tex] →2 FeCl[tex]_3[/tex]
moles of FeCl[tex]_3[/tex] =13.85/159.69=0.08 mol
2 mole of FeCl[tex]_3[/tex] produce from 3 moles of iron
1 mole of Fe[tex]_2[/tex]O[tex]_3[/tex] produce from 3/2 moles of iron
0.08 mole of FeCl[tex]_3[/tex] produce from (3/2)×0.08 =0.13 moles of iron
mass of iron =0.13×52=4.16g
Therefore, 4.16g of iron would need to be reacted.
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