Answer:
This explanation could be improved by specifying the two substances being compared and giving more detailed information about their properties, such as their chemical structure, molecular formula, and other physical and chemical characteristics. Additionally, describing why the two substances have different properties, such as differences in bonding type or molecular arrangement, could provide a more comprehensive explanation.
how do you determine the range of electrolyte concentration in which a controlled flocculation occurs
The range of electrolyte concentration in which controlled flocculation occurs can be determined by performing a series of experiments where the electrolyte concentration is gradually increased or decreased.
Here are the general steps for determining the range of electrolyte concentration:
Prepare a series of solutions with different electrolyte concentrations by adding increasing or decreasing amounts of the electrolyte to the sample.
Mix the solutions thoroughly and allow them to sit for a specific period of time to allow for flocculation to occur.
Observe the samples and record any changes in the sample's appearance, such as increased turbidity or formation of flocs.
Compare the results of each sample to identify the range of electrolyte concentration at which controlled flocculation occurs.
Repeat the experiment several times to confirm the range of electrolyte concentration that results in controlled flocculation.
Once the range of electrolyte concentration is determined, it can be used to optimize the flocculation process by selecting an electrolyte concentration within the range to achieve the desired flocculation effect.
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The characteristic odor of pineapple is due to a compound known as ethyl butyrate. Combustion of 2.78 mg of ethyl butyrate produces 6.32 mg CO
2 and 2.58 mg H2O.
a. What is the empirical formula of this compound?
b. In a separate experiment, the molar mass was determined to be about 115 g/mol. What is the molecular formula of ethyl butyrate?
A. The empirical formula of the compound is [tex]C_{3} H_{6} O[/tex].
B. The molecular formula of ethyl butyrate [tex]C_{6} H_{12} O_{2}[/tex]
The empirical formula of a chemical compound is defined as the simplest whole number ratio of atoms present in a compound. The molecular formula shows the exact number of atoms of each element making up the compound. It may be similar to the molecular formula of the compound. In the combustion of 2.78 mg of ethyl butyrate produces 6.32 mg CO2 and 2.58 mg H2O. In the one millimole of carbon dioxide, there is 1 millimole of carbon. So, in 44.01 mg of carbon dioxide there is 12.01 mg of carbon. Likewise there is 2 mole of hydrogen in every mole of water. So, in 18.02 mg of water there is 2.02 mg of hydrogen since the molar mass of hydrogen is 1.01 mg/mole. The molecular formula of the compound can be written as C6H12O2.
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Question 2(Multiple Choice Worth 3 points)
(01.02 LC)
What is the metric unit for length?
O Meters
O Miles
O Distance
O Inches
Answer: metric unit for length would be Meters (m)
suppose you mix 100.0 g of water at 21.4 oc with 75.0 g of water at 72.0 oc. what will be the final temperature of the mixed water, in oc?
mix 100.0 g of water at 21.4 oc with 75.0 g of water at 72.0 oc then final temperature of the mixed water is 34.9°C.
To find the final temperature of the mixed water, we can use the principle of heat transfer. The heat lost by the hot water is equal to the heat gained by the cold water. The formula for calculating heat transfer is: Q = mcΔT, where Q is the heat transfer, m is the mass of the substance, c is the specific heat capacity of the substance, and ΔT is the change in temperature.
First, we can calculate the heat lost by the hot water using Q = mcΔT. The mass of the hot water is 75.0 g, the specific heat capacity of water is 4.184 J/g°C, and the initial temperature of the hot water is 72.0°C, while the final temperature is unknown. Therefore, the heat lost by the hot water is (75.0 g)(4.184 J/g°C)(72.0°C - x), where x is the final temperature of the mixed water.
Next, we can calculate the heat gained by the cold water using the same formula, but with the mass, specific heat capacity, and initial temperature of the cold water. The heat gained by the cold water is (100.0 g)(4.184 J/g°C)(x - 21.4°C).
Since the heat lost by the hot water is equal to the heat gained by the cold water, we can set these two expressions equal to each other and solve for x:
(75.0 g)(4.184 J/g°C)(72.0°C - x) = (100.0 g)(4.184 J/g°C)(x - 21.4°C)
Solving for x gives x = 34.9°C.
Therefore, the final temperature of the mixed water is 34.9°C.
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A 10-kg rock falls from a height of 8.0 m above the
ground. What is the potential energy of the rock?
Does doubling the amount of substance that dissolves in water correspond to a doubling of a temperature change in the solution? Explain
The temperature change would not necessarily double, but it would depend on the initial temperature, the specific heat capacity of the solution, and other factors affecting the dissolution process.
What is Dissolution process?
Dissolution is a physical process where a solid or a liquid substance dissolves in a liquid solvent to form a homogeneous solution. It is a process in which the solute particles are separated and dispersed in the solvent. This process is driven by the intermolecular interactions between the solute and solvent molecules. The dissolution process is a key step in many chemical and biological processes, such as digestion, drug absorption, and many industrial processes.
No, doubling the amount of substance that dissolves in water does not necessarily correspond to a doubling of the temperature change in the solution. The temperature change in a solution is determined by the amount of heat transferred to or from the solution, the heat capacity of the solution, and the amount of solute dissolved.
Doubling the amount of solute dissolved would increase the amount of heat absorbed or released during the process of dissolution, but the heat capacity of the solution would remain the same. Therefore, the temperature change would not necessarily double, but it would depend on the initial temperature, the specific heat capacity of the solution, and other factors affecting the dissolution process.
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the by-products of the refining of petroleum are separated based on which characteristic? responses boiling point boiling point concentration concentration melting point , melting point composition
The by-products of the refining of petroleum are separated based on their boiling points and composition.
Petroleum refining involves the process of heating crude oil in a distillation column to separate it into its various components, which have different boiling points. The crude oil is heated and the vaporized oil rises through the column, where it condenses at different heights according to its boiling point.
Additionally, the composition of the crude oil also plays a role in the separation process. Crude oil is made up of a complex mixture of hydrocarbons, which are molecules made up of carbon and hydrogen atoms. Different types of hydrocarbons have different boiling points, so the composition of the crude oil determines the boiling points of the different components that are separated during refining.
In summary, the by-products of petroleum refining are separated based on their boiling points, which are determined by their composition of hydrocarbons.
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The ratio is very close to 1 C to 2 H.
What is the empirical formula?
A. C₂H
B. CH₂
C. C₂H₂
The ratio is very close to 1 C to 2 H. Then the empirical formula is CH₂. Therefore, option B is correct.
What is an empirical formula ?An Empirical formula is the chemical formula of a compound that gives the proportions (ratios) of the elements present in the compound but not the actual numbers or arrangement of atoms. This would be the lowest whole number ratio of the elements in the compound.
To find the ratio or the moles of each element by dividing the number of moles of each by the smallest number of moles.
In CH₂ there are one carbon and two hydrogen atoms are present. Hence, CH₂ is an empirical formula.
Thus, option B is correct.
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The strength of an ionic bond comes principally from:a) The converting of atoms into compounds.b) The movement of electrons from cations to anions.c) The mutual attraction of opposite electrical charges.d) The sharing of electrons.
The strength of ionic bond is principally from the mutual attraction of opposite charges. So the correct option here is C.
Ionic compounds are formed by the interaction of electropositive metals and electronegative non metals. The difference in electronegativities are so high that the electrons are completely transferred between atoms to form the bond.
The metals, having 1 or 2 electrons in the outer shell gives up the electrons to complete octet electron configuration and becomes positively charged ions. The non metals need one or two electrons to complete octet, so they take the electrons given by the metals, and thus become negatively charged ions.
So the attraction between the positive and negative charged ions is the reason the compound exists. So the mutual attraction of opposite charge is the strength of ionic bond.
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calculate the maximum numbers of moles and grams of iodic acid (hio3) that can form when 373 g of iodine trichloride reacts with 140.5 g of water:
Number of moles of Iodic acid is 1.59 moles and the number of moles of Water is 7.80 moles.
Iodic acid that can form when 373 g of iodine trichloride reacts with 140.5 g of water
The balanced chemical equation is,
2ICl₃ + 3H₂O → ICI + HIO₃ + 5HCl
Mass of Iodine trichloride is 373 g.
Mass of H₂O is 140.5 g.
Number of moles = mass / molar mass
molar mass of ICl3 is 233.5g/mole.
molar mass of water is 18g/mole.
Number of moles of ICl₃ = 373g / 233.5g/mole
= 1.59 moles
Number of moles of H₂O = 140.5 g / 18g/mole
= 7.80 moles
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What experimental criteria will be used to measure the bromination rate of the hydrocarbons1.Precipitation2.gas evolution3.Discoloration4.temperature changes
Temperature changes is the criteria which is used to measure the bromination rate of the hydrocarbons.
The concentrations of the chemical species involved in the bromination have no effect on the rate constant. However, it is affected by other factors such as temperature or ionic strength, for example, k. (T). The rate constant's units are determined by the overall reaction order.
Bromine is a reddish-brown colour, while the rest of the reactants and products are clear. Thus, the reaction rate can be conveniently measured by using a spectrophotometer to monitor the concentration of bromine.
It is predicted that the presence of an alkyl or alkoxy substituent will increase bromination rates (relative to benzene) and direct bromination to the para and ortho positions of alkyl- and alkoxybenzenes.
Because the rate-determining step for bromination is endothermic, it is slower than chlorination. In general, bromination and chlorination are both exothermic reactions.
For 1°;2°;3° hydrogens, the relative rate of radical bromination is 1; 82; 1640. Make a list of all the monobrominated products that could result from the radical bromination of the compounds.
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What is the function of this monosaccharide molecule?
please help
Answer: produce and store energy.
Explanation:
Given 3. 82g of (NH4)2O find how many atoms of (NH4)2O
Answer: 4.41*10^23 atoms
Explanation:
3.82*(6.02*10^23)/52.10= 4.41*10^23 atoms
N*2=14.01*2=28.02
H*8= 1.01*8= 8.08
O*1=16.00*1=16.00
Add them together to get 52.10 g
The colligative molality of seawater is approximately 1.10 m. Calculate the vapor pressure of sea water at 20°C. The vapor pressure of pure water at 20°C is 17.54 Torr?
From the given information using the colligative property, the vapor pressure of seawater at 20°C is approximately 17.07 Torr.
To calculate the vapor pressure of seawater at 20°C, we can use the following equation:
ΔP = P°(solvent) - P(solvent)
where ΔP is the change in vapor pressure, P°(solvent) is the vapor pressure of the pure solvent (water), and P(solvent) is the vapor pressure of the solvent in the solution (seawater). We can solve for P(solvent) to get the vapor pressure of seawater.
The vapor pressure of pure water at 20°C is given as 17.54 Torr. We can assume that the seawater solution is dilute and therefore can use the following approximation:
ΔP ≈ -Km
where K is the cryoscopic constant (for water, K = 1.86 °C/m) and m is the molality of the solution.
Substituting the given values, we get:
ΔP = -Km = -1.86 °C/m × 1.10 m = -2.046 °C
To convert this temperature change to a vapor pressure change, we can use the Clausius-Clapeyron equation:
ln(P°(solvent)/P(solvent)) = ΔHvap/R × (1/T(solvent) - 1/T°)
where ΔHvap is the enthalpy of vaporization of the solvent, R is the gas constant, T(solvent) is the temperature of the solvent in kelvin (20 + 273 = 293 K), and T° is the normal boiling point of the solvent (100°C or 373 K for water).
We can solve for P(solvent) to get:
P(solvent) = P°(solvent) × exp(-ΔHvap/R × (1/T(solvent) - 1/T°))
The enthalpy of vaporization of water is approximately 40.7 kJ/mol, and R is 0.08206 L·atm/mol·K.
Substituting the values, we get:
P(solvent) = 17.54 Torr × exp(-40700 J/mol / (0.08206 L·atm/mol·K × 293 K) × (1/293 K - 1/373 K)) = 17.07 Torr
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Organic molecules that are universally used as an immediate source of energy are the:_________
When ATP is broken down, it releases energy in the form of a phosphate bond, which can be used to power metabolic processes.
What is metabolic ?Metabolism is the set of life-sustaining chemical reactions that occur in living organisms. These biochemical processes allow organisms to grow and reproduce, maintain their structures, and respond to their environment. Metabolism of energy within cells is known as cellular metabolism. Metabolism can be divided into two categories, catabolism and anabolism. Catabolism is the breakdown of molecules to obtain energy. Anabolism is the building up of molecules to create other molecules and store energy. Metabolic reactions involve the energy that is used to power the cell and the molecules that are used as building blocks for biosynthesis.
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if you have a 100mm solution of the weak acid (pka of 7.3) that was at a ph of 7.3 and you added 250mm koh, what would the new ph be? (assume the volume is constant)
The new pH of the solution after the addition of 250 mM of KOH is approximately 11.6.
To solve this problem, we need to use the equation that relates the pH of a solution to the dissociation constant (pKa) of a weak acid and the ratio of the concentrations of the weak acid and its conjugate base. We can use this equation to calculate the initial concentration of the weak acid and its conjugate base, then use the stoichiometry of the reaction between the weak acid and the strong base to calculate the concentrations of the weak acid and its conjugate base after the addition of KOH. Finally, we can use the same equation to calculate the new pH.
The equation we need to use is:
pH = pKa + log([A-]/[HA])
where [A-] is the concentration of the conjugate base and [HA] is the concentration of the weak acid.
First, we can use the initial pH of 7.3 to calculate the initial concentration of the weak acid using the following equation:
pH = -log[H+]
[H+] = 10^(-pH) = 10^(-7.3) = 5.01 x 10^(-8) M
Since the initial pH is equal to the pKa of the weak acid, we know that half of the weak acid has dissociated into its conjugate base, so the initial concentration of the weak acid is equal to the initial concentration of the conjugate base:
[HA] = [A-] = 5.01 x 10^(-8) / 2 = 2.505 x 10^(-8) M
When we add 250 mM of KOH to the solution, it will react with the weak acid to form its conjugate base and water:
HA + OH- → A- + H2O
The stoichiometry of the reaction tells us that the concentration of the weak acid will decrease by the same amount that the concentration of the conjugate base increases. If we assume that the total volume of the solution is 100 mL, then the final volume of the solution will be 350 mL, and the concentration of KOH will be:
[OH-] = 250 mM / 350 mL = 0.714 M
At the end of the reaction, the concentration of the conjugate base will be:
[A-] = [HA]initial + [OH-] = 2.505 x 10^(-8) M + 0.714 M = 0.714 M
The concentration of the weak acid will be:
[HA] = [OH-] = 0.714 M
Now we can use the same equation as before to calculate the new pH:
pH = pKa + log([A-]/[HA]) = 7.3 + log(0.714/2.505x10^-8) ≈ 11.6
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two porous containers are filled with hydrogen and neon respectively. under identical conditions, 2/3 of the hydrogen escape in 6 hours. how long will it take for half the neon to escape?
Using Grahams law, after calculation it takes about 2 * (1/0.223) = 2.24 times as long for half of the neon to escape, or approximately 13.44 hours.
We can use Graham's Law to solve this problem, as it relates the rate of effusion of a gas to its molar mass. According to Graham's Law, the rate of effusion of a gas is inversely proportional to the square root of its molar mass.
Let's assume that the rate of effusion of hydrogen is 1. We need to find the time it takes for half of the neon to escape, given that 2/3 of the hydrogen has escaped in 6 hours.
From Graham's Law, we know that:
(rate of effusion of hydrogen) / (rate of effusion of neon) = sqrt(molar mass of neon) / sqrt(molar mass of hydrogen)
We can rearrange this equation to solve for the rate of effusion of neon:
(rate of effusion of neon) = (sqrt(molar mass of hydrogen) / sqrt(molar mass of neon)) * (rate of effusion of hydrogen)
Since we know that the rate of effusion of hydrogen is 1, we can simplify the equation to:
(rate of effusion of neon) = (sqrt(molar mass of hydrogen) / sqrt(molar mass of neon))
We can find the ratio of the molar mass of hydrogen to neon from the periodic table. The molar mass of hydrogen is 1 g/mol, and the molar mass of neon is 20.18 g/mol. Therefore:
(sqrt(molar mass of hydrogen) / sqrt(molar mass of neon)) = (sqrt(1 g/mol) / sqrt(20.18 g/mol)) = 0.223
So, the rate of effusion of neon is 0.223 times the rate of effusion of hydrogen. If 2/3 of the hydrogen has escaped in 6 hours, then 1/3 of the hydrogen is still in the container after 6 hours. Since the rate of effusion of neon is 0.223 times the rate of effusion of hydrogen, we can assume that the rate of effusion of neon is constant and also 0.223. Therefore, it will take 1/2 * (1/0.223) = 2.24 times as long for half of the neon to escape, or approximately 13.44 hours.
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which one of the following pairs of molecules would you expect to have the higher melting point? a. cl2 or br2 b. c4h10 or c5h12 c. nh3 or ph3 d. na or mg e. beo or kcl f. icl or br2
BeO or KCl will have a higher melting point than any other pair given above in the question.
The pair of molecules that would have the higher melting point would be e. BeO and KCl. BeO has a higher molecular weight and is more covalently bonded, which makes it more stable and more difficult to break the intermolecular forces. This makes it have a higher melting point than KCl, which is held together by ionic bonds, which are relatively weaker and easier to break.
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What piece of equipment is used for measuring exact volumes of liquid?
It is typical to measure liquid volume using both a graduated cylinder and a buret. As the name implies, a graded cylinder is a cylindrical glass or plastic tube that is sealed at one end and has a calibrated scale inscribed on the outside.
A measuring cylinder, often referred to as a graded cylinder, a measuring cylinder, or a mixing cylinder, is a piece of lab apparatus used to gauge the quantity of fluids, chemicals, or solutions used during a typical lab session. Graduated cylinders are more precise and accurate than traditional laboratory flasks and beakers. The scale on a 50-mL buret is in increments of 0.1 mL. A buret's liquid level is measured and recorded to the nearest 0.01 mL in order to prevent any inaccuracies. The volume of the liquid can be calculated using a measuring flask, pipette, and measuring cylinder.
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The equilibrium SO₂Cl₂ (g) --> SO₂ (g) + Cl₂ (g) is attained at 25 °C in a closed container.
When the concentration of Cl₂ is increased keeping the temperature constant, which of the following statements are correct?
a) Concentration of SO₂ is increased
b) Concentration of SO₂Cl2 is decreased
c) Concentration of SO₂ is decreased
d) None of the above
what happens when an acidic solution is mixed with a basic solution? Give an example
Answer: Neutralization reaction
Explanation:
When an acidic solution is mixed with a basic solution, the result is a neutralization reaction. Neutralization reactions are reactions between acids and bases that result in the formation of a salt and water.
Acid + Base → Salt + Water
Here are some examples of acid-base reactions:
H.ydrochloric acid (HCl) and sodium hydroxide (NaOH):
HCl + NaOH → NaCl + H2O
Sulfuric acid (H2SO4) and calcium hydroxide (Ca(OH)2):
H2SO4 + Ca(OH)2 → CaSO4 + 2H2O
write the ground-state electron configuration for calcium, ca.
the electron configuration for calcium can be written as:
1s2 2s2 2p6 3s2 3p6 4s2
The atomic number of calcium is 20, indicating that it has 20 electrons. The ground-state electron configuration for calcium can be written using the following rules: 1s2 2s2 2p6 3s2 3p6 4s2
The first number before each sub-shell indicates the principal quantum number (n), while the letter indicates the type of sub-shell (s, p, d, or f) and the superscript indicates the number of electrons in that sub-shell. Therefore, the electron configuration for calcium can be written as:
1s2 2s2 2p6 3s2 3p6 4s2. Electronic configuration refers to the distribution of electrons in the orbitals of an atom or ion. It describes the arrangement of electrons in the electron shells or energy levels and subshells or orbitals of an atom or ion.
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what types of intermolecular forces are exhibited by each compound?
The types of intermolecular forces exhibited by a compound depend on the nature of the individual molecules and their molecular geometry.
In general, there are three main types of intermolecular forces:
London dispersion forces: These are the weakest type of intermolecular force and are present in all molecules. They arise due to temporary fluctuations in electron density, resulting in the formation of instantaneous dipoles. London dispersion forces increase with increasing molecular size and surface area.Dipole-dipole interactions: These occur between molecules with permanent dipoles, such as polar covalent compounds. The positive end of one dipole is attracted to the negative end of another dipole, leading to a net attractive force. Dipole-dipole interactions are stronger than London dispersion forces.Hydrogen bonding: This is a special type of dipole-dipole interaction that occurs between molecules containing hydrogen atoms bonded to highly electronegative atoms such as nitrogen, oxygen, or fluorine. Hydrogen bonding is a particularly strong type of intermolecular force due to the large electronegativity difference between hydrogen and these other atoms.Here are examples of compounds and the types of intermolecular forces they exhibit:
Water (H2O): Water is a polar covalent compound with a bent molecular geometry. It exhibits both hydrogen bonding and dipole-dipole interactions.Carbon dioxide (CO2): Carbon dioxide is a nonpolar molecule with a linear molecular geometry. It exhibits only London dispersion forces.Ethanol (C2H5OH): Ethanol is a polar covalent compound with a bent molecular geometry. It exhibits both hydrogen bonding and dipole-dipole interactions.Methane (CH4): Methane is a nonpolar molecule with a tetrahedral molecular geometry. It exhibits only London dispersion forces.To learn more about intermolecular forces refer to this link
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can you assume that any coloration you see in an animal is cryptic? why or why not
No, it is not safe to assume that any coloration seen in an animal is cryptic. While many animals have evolved to have coloration that helps them blend into their environment and avoid predators or attract mates, there are also many animals that have bright and conspicuous coloration for other reasons, such as warning predators of their toxicity or advertising their fitness to potential mates. Therefore, it is important to consider the specific context and behavior of the animal before making assumptions about the purpose of its coloration.
What is cryptic colouration?Cryptic coloration refers to an animal's ability to blend in with its environment, making it difficult for predators or prey to spot them. This can help the animal avoid being detected, making it easier to hunt or avoid being hunted. Cryptic coloration can take many forms, including camouflage, mimicry, or disruptive coloration, and is a common adaptation seen in many species of animals, including insects, birds, reptiles, and mammals.
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not chem but anatomy. Which of the following is the chronological
order of events that occur when a person is
trying to keep their balance?
You retain balance when the weight and the reaction forces are balanced.
What chronological events helps a person to keep balance?Your question is incomplete but I think you want to know how a person can retain balance.
We know that we can only be keep balance when the forces that are acting on the person is balanced. The implication of it is that there are no unbalanced forces that are acting on the person.
The two forces that act on you when you stand are the weight and the reaction force. If these two forces are balanced then you can be able to retain your balance.
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in an electric discharge the emission spectra of helium is an example of:______.
In an electric discharge the emission spectra of helium is an example of flame test. light is released with the energy corresponding to the difference in energy between the higher and lower states.
What is emission spectra?Electrons are stimulated to something like a higher energy level when a molecule or atom absorbs energy. When the electron returns to the lower energy level, light is released with the energy corresponding to the difference in energy between the higher and lower states.
Because several levels of energy are available, each electron can experience numerous transitions, each of which produces a distinct wavelength that makes up the emission spectrum. In an electric discharge the emission spectra of helium is an example of flame test.
Therefore, in an electric discharge the emission spectra of helium is an example of flame test.
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How could you modify this simulation to demonstrate that different isotopes have different half lives
The simulation can be modified to demonstrate different isotopes have different half lives by [tex]-\frac{d[A]}{dt} = k[A]^n[/tex]
Partial life is a partial life because it's defined this way. stay lower than that, and the decay will take out lower than partial tittles; stay more, and it'll take out further than half.
The partial life is used as a accessible measure because a sample of isotopes decays exponentially with time. Each snippet has the same chance of decaying in a fixed time interval and this leads to an exponential decay. All tittles bear the same way and continue to decay until all have been changed, whether this takes glories or seconds.
You can just as fluently define a" one- third" life, a" quarter- life". Radioactive isotopes decay exponentially; half- life is just accessible measure that captures the kinetics of the decay.
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in order to react safely and appropriately during a vehicle failure, the motorist needs to understand the following: a) what has happened? b) what are the correct procedures to follow? c) how are these procedures immediately and successfully implemented? d) all of the above
The answer is that in order to react safely and appropriately during a vehicle failure the motorist need to understand is stated in option d, that says, all of the above.
During a vehicle failure the motorist should react safely and appropriately in order to deal with the situation in a suitable and safe manner.
The first important thing is that the motorist heads to understand what has happened and what are the next correct procedures that he should follow and finally the motorist should also understand that how these procedures should be implemented immediately and successful it too.
As we can see that all of these three things are very important in order to react safely, we can conclude that the answer to your question is option d. all of the above.
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Determine the vapor pressure (in torr) of a substance at 36°C, whose normal boiling point is 84°C and has a ΔHvap of 22.1 kJ/mol.
The vapor pressure (in torr) of the substance at 36°C is 7.11 torr.
What is vapor pressure?Vapor pressure is a measure of the tendency of a liquid or solid to evaporate into a gas. It is the pressure of the gaseous form of a chemical that is in equilibrium with its liquid or solid form at a certain temperature.
The vapor pressure (in torr) of a substance at 36°C can be determined by using the Clausius-Clapeyron equation, which states that the change in vapor pressure (ΔP) is equal to the enthalpy of vaporization (ΔHvap) divided by the ideal-gas constant (R) multiplied by the absolute temperature (T) and the natural logarithm of the ratio of the vapor pressure at the boiling point (Pb) divided by the vapor pressure at the current temperature (P).
Therefore, the vapor pressure of the substance at 36°C can be calculated as follows:
ΔP = (ΔHvap/R) * (T/ln(Pb/P))
ΔP = (22.1 kJ/mol/8.314 J/mol/K) * (309.15 K/ln(Pb/P))
ΔP = 2.68 * (309.15 K/ln(Pb/P))
P = Pb/e^(2.68 * (309.15 K/T))
P = 101.3 torr/e^(2.68 * (309.15 K/309.15 K))
P = 101.3 torr/e^2.68
P = 101.3 torr/14.24
P = 7.11 torr
Therefore, the vapor pressure (in torr) of the substance at 36°C is 7.11 torr.
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What is the normality of:
2.5 M gallium(III) hydroxide
6.0 M barium hydroxide
4.5 M sulfuric acid
0.54 M iron(II) hydroxide
Answer:
The term "normality" refers to the number of moles of a solute present in one liter of a solution, expressed as equivalents per liter (Eq/L). To calculate the normality of a solution, you need to know the molarity (moles of solute per liter of solution) and the equivalent weight of the solute. The equivalent weight of a solute is the atomic weight or molecular weight of the solute divided by the number of ions or molecules that can be formed from one molecule of the solute.
2.5 M gallium(III) hydroxide: Gallium(III) hydroxide is a basic compound and forms Ga(OH)3. One mole of Ga(OH)3 will yield three moles of hydroxide ions, so the equivalent weight of Ga(OH)3 is 1/3 of its molecular weight. Therefore, the normality of 2.5 M gallium(III) hydroxide solution is 2.5 x 3 = 7.5 N.
6.0 M barium hydroxide: Barium hydroxide is a basic compound and forms Ba(OH)2. One mole of Ba(OH)2 will yield two moles of hydroxide ions, so the equivalent weight of Ba(OH)2 is 1/2 of its molecular weight. Therefore, the normality of 6.0 M barium hydroxide solution is 6.0 x 2 = 12 N.
4.5 M sulfuric acid: Sulfuric acid is an acidic compound and forms H2SO4. One mole of H2SO4 will yield two moles of hydrogen ions, so the equivalent weight of H2SO4 is 1/2 of its molecular weight. Therefore, the normality of 4.5 M sulfuric acid solution is 4.5 x 2 = 9 N.
0.54 M iron(II) hydroxide: Iron(II) hydroxide is a basic compound and forms Fe(OH)2. One mole of Fe(OH)2 will yield two moles of hydroxide ions, so the equivalent weight of Fe(OH)2 is 1/2 of its molecular weight. Therefore, the normality of 0.54 M iron(II) hydroxide solution is 0.54 x 2 = 1.08 N.
