3 minute would have passed from time equals zero
Calculation
The half-life of a radioisotope is the time it needs for the mass of the radioisotope to halve with respect to its original value.
In this problem, the initial mass of the radioisotope at t=0 is
m0 = 50.0 mg
We see that after t = 1 min, the mass of the isotope is
m(1 min) = 25.0 mg
so, exactly half the initial mass: this means that 1 minute is exactly the half-life of this radioisotope.
So, the amount of mass left after each minute is the following:
m (1 min ) = 25.0 mg (1 half-life)
m (2 min) = 12.5 mg (2 half-lives)
m (3 min) = 6.25 mg (3 half-lives)
so, when we are left with 6.25 mg of isotope, 3 minutes have passed, which means that 3 half-lives have passed.
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A mixture of 12.0 g of helium gas and 24.0 g of o2 is stored in a 5.00 l container and temperature of 25.0 celsius what are the partial pressures of helium and oxygen and what is the total pressure in the container
As a result, the total pressure inside the container was 66 atm, which is the partial pressure of helium and oxygen.
What is helium gas?Chemical element helium has the atomic number 2 and the symbol He. It is the first member of the noble gas group in the periodic table and is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas. Two electrons, two protons, and typically two neutrons make up the element helium. It is an inert gas that has no color or smell. The byproduct of both fusion and fission is helium. Helium was found in the sun's spectrogram for the first time in 1868.
What is helium used for and who created helium?The most well-known application of helium is as a secure, inflammable gas used to inflate balloons for celebrations and parades. Helium is a crucial element in a variety of industries, including national defense, high-tech manufacturing, medical technology, and scientific research.
Discovery of helium on August 18 and October 20, 1868. Helium was discovered by Joseph Norman Lockyer and Pierre Janssen (top and bottom). Helium, which is produced by the radioactive decay of atoms like uranium, is the second most plentiful element in the observable universe but is very uncommon on Earth.
Briefing:As a result, the partial pressures of the component gases are added to determine the overall pressure of the gas mixture: The total number of moles in the gas mixture, or ntot, is equal to the sum of all ni. Ptot = Pi = P1 + P2 + P3...
Ptot = ∑Pi = P1 + P2 + P3
=12+24+5+25
=66atm
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A closed-end manometer was attached to a vessel containing argon. The difference in the mercury levels in the two arms of the manometer was 10. 1 cm. Atmospheric pressure was 783 mm hg. The pressure of the argon in the container was ________ mm hg.
The argon inside the container had a pressure of 101 mm Hg, according to the equation.
What are different sorts of pressure?Stress is a term used to describe a physical force imparted to an item. A horizontal force is exerted per unit area to an object's surface. The basic formula for pressure is G n. (Force per unit area).
What is the pressure unit in the SI?An SI unit of pressure, the pascal (abbreviated as Pa), is equal with one newton every sq.m (N/m2 or kg m-1s-2). Surprisingly, this name was chosen in 1971.
Briefing:The height of the mercury level difference is
h=10.1cm
With multiplying it by 10, we may translate it to millimeters.
h=10.1*10=101mm
The closed manometer's pressure would be equal to its height.
P(gas)=h
P(gas)=101mmHg.
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which answer has the colors in order from the lowest energy to the highest? group of answer choices red, blue, green blue, red, green blue, green, red red, green, blue
red<yellow<green<blue<violet are the colors.
The light spectrum contains waves with specific wavelength which can be classified into groups. Most of the groups are invisible to the eye (like infrared, microwaves, radio waves, gamma rays, etc.) however, there is one group that is known as visible light.
Visible light allows us to see colors from red all the way to violet. The colors have different frequencies and wavelengths. The wave with the highest frequency also has the highest energy (which in this case is violet). Hence, as the frequency decreases, the energy will also decrease, making violet have the highest energy, and red have the lowest energy.
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Compared to the particles in a hardened lava sample the particles in a liquid lava sample.
Compared to the particles in a hardened lava sample the particles in a liquid lava sample are moving faster.
Lava is a mixture of the elements silicon, oxygen, aluminum, iron, magnesium, calcium, sodium, potassium, phosphorus, and titanium, as well as other elements in very minute amounts. Consider reading the background material in Minerals, Magma, and Volcanic Rocks. Lava is a liquid that solidifies into rock when it cools. BACKGROUND: On the surface of the earth, lava is a liquid form of molten rock. Extreme heat inside the Earth's crust causes lava to develop, which then explodes to create volcanoes. Geothermal energy can be extracted and used in a variety of ways because it can be found on the Earth's surface in various forms (such as dry heat, steam vents, lava, and geysers).
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Which of the following is a paleoclimate proxy? O A Written temperature records from the summer of 1863 OB Measurements of fossilized tree rings from the Cretaceous period O c A database of satellite temperature data, from 1970 through present © D All of the above
Option B is correct which is Measurements of fossilized tree rings from the Cretaceous period is a paleoclimate proxy.
The study of past climates ("paleoclimatology"), climate proxies are preserved physical characteristics of the past that stand in for direct meteorological measurements and enable scientists to reconstruct the climatic conditions over a longer fraction of the Earth's history. Reliable global records of climate only began in the 1880s, and proxies provide the only means for scientists to determine climatic patterns before record-keeping began.
A large number of climate proxies have been studied from a variety of geologic contexts. Examples of proxies include stable isotope measurements from ice cores, growth rates in tree rings, species composition of sub-fossil pollen in lake sediment or foraminifera in ocean sediments, temperature profiles of boreholes, and stable isotopes and mineralogy of corals and carbonate speleothems.
Proxies can be combined to produce temperature reconstructions longer than the instrumental temperature record and can inform discussions of global warming and climate history. The geographic distribution of proxy records, just like the instrumental record, is not at all uniform, with more records in the northern hemisphere.[3]
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true or false: the outer orbitals of a halogen are further from the nucleus and are thereby more polarizable.
False, A halogen's outer orbitals are more polarizable since they are located further from the nucleus.
What commonalities in the halogens' electron configuration are there?You'll see that the outer shells of the atoms fluorine and chlorine both have seven electrons. All the halogens share that property of having seven electrons. All of them are only one electron short of having complete shells.
Why is it challenging to take an electron out of a halogen?Ionization force It is the amount of energy needed to separate one mole of gaseous atoms from one mole of electrons. Non-metals called halogens have seven valence electrons. Due to their lack of a tendency to lose electrons, halogens have exceptionally high ionization energies.
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if the sample of chips used to make the filtrate weighed 75.5 kg , how much nacl nacl is present in one serving (155 gg ) of chips?
The amount of table salt in one serving or 155g of chips is 0.608g if the sample of chips used to make the filtrate weighed 75.5 kg.
By undergoing titration by Mohr's method with AgNO₃ and KCl, The chemical reaction is given by,
AgNO3(aq) + NaCl(aq) --> AgCl(s) + NaNO3(aq)
No moles of KCI are given by W/G.M.Wt
= 0.5/74.55
= 0.006707 moles of KCI
Then, from the reaction,
no of moles of KCI = no of moles of AgNO₃
Therefore,
molarity of AgNO₃ = no of moles/volume in L
= 0.006707/0.0625
= 0.107312M
47.2 ml of AgNO₃ solution to precipitate all of the chlorides.
Then, no of moles of Cl⁻ = molarity x volume in L
On substituting,
= 0.107312*0.0472
= 0.005065 moles
no of moles of Cl⁻ = no of moles of NaCl
mass of NaCl = no of moles of NaCl x gram molar mass of NaCl
= 0.005065 x 58.5
= 0.2963g of NaCl
155/75.5. = 2.05298013 chips
2.05298013x 0.2963 = 0.608298013 g
Therefore, 0.608g of NaCl is in 115g of chips.
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in aqueous solution, glucose equilibrates between two cyclic forms and an open chain form. at equilibrium what percentage of each form is present?
At equilibrium, the percentage of each form of glucose present in the aqueous solution depends on the pH of the solution.
At a pH of about 0-4, the open-chain form of glucose (aldose) is the dominant form and is present in a concentration of about 95%.
At a pH of about 5-7, the cyclic forms of glucose (aldohexoses) are the dominant form and are present in a concentration of about 60-70%.
At a pH of 8 or higher, the open-chain form of glucose is again the dominant form, being present in a concentration of about 95%.
The percentage of each form of glucose present in any aqueous solution is also affected by the presence of other molecules and ions in the solution, as well as the temperature and pressure.
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1. were there any compounds that you could not positively id based on the information you had available to you? explain if needed.
Generally speaking, using the materials and the images provided, I was able to identify the majority of the compounds, though not positively 100% because some compounds do not appear using only NMR spectroscopy.
What purposes does NMR spectroscopy serve?NMR spectroscopy uses NMR phenomena to investigate the material's physical, chemical, and biological characteristics. To ascertain the identity and structure of molecules, chemists use it. For diagnostic purposes, medical professionals use the multidimensional NMR imaging technique known as magnetic resonance imaging (MRI).
Compounds are defined as substances with two or more constituent parts. Table salt, carbon dioxide, and water are examples of compounds.
A compound in chemistry is a substance made up of two or more different chemical elements mixed together in a specific proportion. Chemical bonds that cannot be broken are created when elements are combined.
When electrons are shared or traded between atoms, these bonds are created.
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circle all of the species below that can form a hydrogen bond in its pure form. explain why the other species couldn't hydrogen bond
Since I2 was larger with more electrons, it has greater forces than N2, that is also nonpolar and only has London dispersion forces.
What is hydrogen used for?Fuel cells may produce energy, power, and heat using hydrogen. The two industries where hydrogen is currently most widely employed are fertilizer manufacturing and petroleum refining, with the developing markets of utilities and transportation.
Can you drink hydrogen water?Experts disagree whether consuming hydrogen water has any hazards. However, they were unsure if its advantages outweigh those of drinking regular water or being hydrated in general. Hypovolemia, which can be fatal, can result from excessive water intake.
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Calculate the normal boiling point of chloroform given that the standard enthalpy of vaporization of chloroform is 31. 4 kj/mol and the standard entropy of chloroform is 93. 7 j/mol·k.
Chloroform's melting or boiling heat is 335.11K given that it has a standard temperature of absorption of 31. 4 kJ/mole or a conventional efficiency of 93. 7 j/mole/K.
What function does chloroform serve?A chemical known as a solvent, or one that facilitates the dissolving of other substances, is formaldehyde. Along with being used in the architecture, paper, and board industries, it is also used in the production of insecticides and films. It functions as a solvent for polishes, floor polish, varnishes, glue, alkaloid, fats, and oils, as well as rubber.
Briefing:Given:
Enthalpy of vaporization (Δ[tex]H_{vap}[/tex] ) = 31.4kj/mole = 31400 j/mole
Entropy of chloroform (ΔS) = 93.7j/mole.k
We know that,
ΔS = ΔH/T
T = ΔH/ΔS
T= 31400/93.7
T = 335.11K
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Which product forms when two or more nonmetal atoms share valence electrons? (1 point)
O a redox reaction
O a monoatomic ion
O a covalent compound
O an ionic compound
When two or more nonmetal atoms share valence electrons, the product formed is covalent compound. Therefore, option C is correct.
What is covalent compound ?An electron exchange that results in the formation of electron pairs between atoms is known as a covalent compound. Bonding pairs or sharing pairs are the names given to these electron pairs.
Covalent bonding is the stable equilibrium of the attractive and repulsive forces between atoms when they share electrons.
One positive and one negative ion are created as a result of this. Ionic bonds are created when opposing charges attract one another. Covalent Bonds are Non-metals can join together to form covalent bonds. When non-metals share their valence electrons, covalent bonds are created.
Thus, option C is correct.
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Voice-over artists lend their voices to movie trailers, animated films, and commercials. Voice-overs are typically recorded in small studios, like the one shown in the photograph, where acoustic foam covers the walls. The porous foam is designed with an irregular surface.
6. Using your knowledge of the reflection, absorption, and transmission of mechanical waves, Why do you think the foam is used, and how do you think it functions?
in the photograph, where acoustic foam covers the walls. The porous foam is designed with an irregular surface and the reason for the use of foam such as acoustic foam is that Smaller, quieter offices might only need a few installations, while more hectic environments might call for a whole acoustic paneling system.
What does foaming provide as a means of?A group of small bubbles known as foam are produced by foaming chemicals. To generate foam, though, you also need water and air. The real function of foam is to prolong the time that a filthy surface is in touch with it, giving wetting agents, detergents, and degreasers time to work.
Therefore, note that acoustic panel is a sound-absorbing panel used to lessen echo and reverberation in a space as well as background noise. We use the term "acoustic panel" in the broadest sense possible, which includes both vertical and horizontal panels.
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when bromine is added to a container, the molecules of its vapor move through the container until they are uniformly distributed. how does this example also represent the movement of energy?
The high energy molecules escape from the surface of the bromine, this is due to bromine's high volitivity (which is due to its weak intermolecular forces).
What is Brownian motion ?
In chemistry, the term "Brownian Movement" refers to a particle's zigzagging motion that is thought to be random and is typically seen under an ultra-high power microscope. The term "Brownian movement" refers to the movement that exactly matches Robert Brown's explanation of the motion of pollen grains in water.
What is energy?
The energy that is contained in chemical compound bonds is referred to as chemical energy (molecules and atoms). In what is referred to as an exothermic reaction, it is released during the chemical reaction and mostly generates heat as a byproduct.
Firstly, the high energy molecules escape from the surface of the bromine, this is due to bromine's high volitivity (which is due to its weak intermolecular forces).
Then due to Brownian motion (the random motion of microscopic particles) there is a net movement of bromine molecules from the region of high concentration (the area above the liquid bromine) spreading out into an area of low concentration. (the rest of the container).
Therefore, the high energy molecules escape from the surface of the bromine, this is due to bromine's high volitivity (which is due to its weak intermolecular forces).
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if 42.6 ml of a 0.140 m koh solution is required to titrate 20.0 ml of a h2so4 solution, what is the molarity of the h2so4 solution
The molarity of the h2so4 solution is 0.149mol/l.
What is molarity?
The number of moles of solute per liter of solution is known as molarity or molar concentration. It is calculated by dividing the number of moles of solute by the total volume of liters of solution.
What is titration?
Titration is the steady addition of a known concentration solution (called a titrant) to a known volume of an unknown concentration solution until the reaction approaches neutrality, which is sometimes signaled by a color change.
According to the question,
2 KOH + H2SO4 → K2SO4 + 2 H2O
No. moles [tex]NaOH[/tex] = [tex]\frac{42.6 * 0.14}{1000}[/tex][tex]\frac{42.6 * 0.14}{1000}[/tex] = [tex]5.96 * 10^-^3[/tex]
From the equation we can see that the no. moles of [tex]H_2SO_4[/tex] must be half that amount so:
No. of moles [tex]H_2SO_4[/tex] = [tex]5.96 * 10^-^3[/tex] / 2 = [tex]2.98 * 10^-^3[/tex]
[tex]c = \frac{n}{v}[/tex] So,
[tex][H_2SO_4][/tex] = [tex]\frac{2.98 * 10^-^3}{20 * 10^-^3}[/tex] = 0.149mol/l
The molarity of the h2so4 solution is 0.149mol/l.
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If the bond angle between two adjacent hybrid orbitals is 109. 5°, which is the hybridization?.
If the bond angle between two adjacent hybrid orbitals is 109. 5°,then hybridization is sp3 or tetrahedral geometry.
Tetrahedral molecules contain uniform bond angles and no nonbonding electron pairs. Because of this, they can only be asymmetric if one atom is different from the rest.
A symmetrical nonpolar molecule can become asymmetric by adding a new atom to the vicinity; however, if the new atom's electronegativity sufficiently differs from the original atom's, the nonpolar molecule turns polar.
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when an electron in an atom of hydrogen moves forom the second to the first principal energy leve, the result is the emisson of
when an electron in an atom of hydrogen moves from the second to the first principal energy leave, the result is the emission of energy.
Energy, which is observable in the execution of labour as well as in the form of heat and light, is the quantitative quality that is transferred to a body or to a physical system in physics. Energy is a preserved resource; according to the rule of conservation of energy, energy can only be transformed from one form to another and cannot be created or destroyed.
It is released when electron jump back from higher energy state to lower energy state.
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an atom of 120in has a mass of 119.907890 amu. calculate its binding energy per mole in kj. enter your answer in exponential format (1.23e4) with 3 significant figures and no units.use the masses: mass of 1h atom
Its binding energy is 1020 MeV per kilojoule. Enter your response using the exponential notation (1.23e4), three significant figures, and no units. Utilize the masses: 1h atom mass.
Given: an In-120 atom weighs 119.907890 amu.
In-120 has 49 protons and 49 electrons in each atom.
quantity of neutrons = (mass number) - (number of protons) (number of protons)
quantity of neutrons = (120) - (49) (49)
71 neutrons are present.
Number of electrons/protons times mass of a 1H atom equals mass of electrons and protons. Therefore, the mass of electrons and protons is equal to (49) * (1.007825 amu), or 49.383425 amu.
Number of neutrons multiplied by the mass of a neutron yields the mass of neutrons as (71) * (1.008665 amu), or 71.615215 amu.
Mass overall = (mass of electrons and protons) - (mass of neutrons) (mass of neutrons)
Total mass equals 49.383425 amu plus (71.615215 amu)
120.99864 amu is the total mass.
Mass change is equal to (Total mass) - (mass of a In-120 atom)
(120.99864 amu) - change in mass (119.907890 amu)
mass change = 1.09075% amu
Change in mass equals 1.09075 amu * (931.5 MeV/c2 / 1 amu)
= 1016 MeV/c2 change in mass
binding energy is equal to (change in mass) times (light speed) squared.
bound energy = (1016 MeV/c2) * (c)
= 1020 MeV for binding energy.
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identify the characteristics of the oxymercuration-demercuration of an alkene. group of answer choices markovnikov, with no rearrangement possible markovnikov, with rearrangement possible anti-markovnikov, with rearrangement possible anti-markovnikov, with no rearrangement possible
The characteristics of oxymercuration-demercurations are Markonikov with no rearrangement possible.
Oxymercuration-demercuration is a reaction sequence used to convert an alkene into an alcohol. The reaction sequence involves two steps. In the first step, the alkene is treated with mercuric acetate (Hg(OAc)2) in the presence of base and a protic solvent, resulting in the formation of a mercurial (Hg-C) intermediate. In the second step, the mercurial intermediate is treated with aqueous sodium borohydride (NaBH4), which reduces the mercurial intermediate to an alcohol.
The reaction is stereo-selective, meaning that it usually produces a single stereoisomer of the alcohol product. This is because the mercurial intermediate is planar, and the presence of the bulky Hg atom helps to prevent the alkene from rotating when it is attacked by the nucleophile.
The reaction is also regio-selective, meaning that one of the double bonds of the alkene is attacked preferentially over the other. This is because the mercurial intermediate is formed in such a way that one of the double bonds is more favorable to attack than the other.
Finally, the reaction is also chemo-selective, meaning that it only reacts with alkenes and not other functional groups. This is because the reaction mechanism involves a strong electrophile-nucleophile interaction between the Hg atom and the alkene, which is not present with other functional groups.
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A metal cools from an initial temperature of 225 oc to 25 oc and releases 160 j of heat energy. If the mass of the metal is 5. 0 g, what is its specific heat capacity?.
When a material is cooled from a temperature of 225 ° c temperature to 25 oC, 160 j worth heat energy are released. H=0.17 J/g*C is the metal's specific heat capacity if its mass is 5.0 g.
Describe heat?Heat is the interchange of "thermal" energy caused by a temperature difference. Consider a system that is isolated and has two components that are initially running at different temperatures. Energy is transmitted from the large heat subsystem 2 to the cooler temperature subsystem.
Briefing:heat energy=160 J released
=5.0 g metal
=A temperature change of (225-35) or 190C.
=160J/(5.0g*190C) = 0.1684 J/g*C
H= 0.17 J/g*C
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Based on the data, which substance has the strongest intermolecular forces?
For the following reaction: 1) Add curved arrows for the first step. 2) Draw both the organic and inorganic intermediate species. Include nonbonding electrons and charges, where applicable. Include hydrogen atoms.
here is the following explanation part:
However, I found similar question to this one, and hope this can helps you. If it's other compound and reactive, tell me to fix it
Now, according to picture 1 (the question), we have alkene reacting with the acid.
This are conditions for reactions similar to the SN1 reactions, so, this reaction follows marknonikov's rule which states that hydrogen will always go to carbon with more hydrogens, while the halide, will goe to the most stable carbon cation.
According to this, mechanism, intermediates and product of reaction is as follow in picture 2.
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Nuclear decay occurs according to first-order kinetics. A nuclide decays in 3. 40 days from 45. 0 g to 12. 1 g. What is the rate constant for the nuclide?.
The rate constant for the nuclide is 0.388
What is nuclear?
Atomic nuclei can transform into new nuclei, and this process is the subject of nuclear chemistry. Nuclear processes cause the atom itself to change. Nuclear reactions are accompanied by changes in energy, just like regular chemical processes.
Nuclear chemistry is the study of internal atomic or nuclear processes. There are many research fields where nuclear chemists can be found, such as nuclear engineering or nuclear imaging in medicine (in power generation).
The rate constant for a first-order reaction is determined by the following equation:
k = -ln(A/A0)/t
where A is the final amount of the nuclide, A0 is the initial amount of the nuclide, and t is the time.
Therefore, the rate constant for the nuclide is:
k = -ln(12.1/45.0)/3.40 = 0.388
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Which gas law can be used to calculate the pressure of hydrogen gas collected over water.
Calculating the tension of hydrogen gas gathered over water is possible using Dalton's Law of Equivalent Pressures.
Is hydrogen a liquid or a gas?Around room temperature and pressure, hydrogen is a gas, but at -423 degrees Fahrenheit, it condenses into a liquid (minus 253 degrees Celsius).
Can fuel be made from hydrogen?The gasoline for engines with internal combustion can also be hydrogen. These, however, are less effective than FCEVs and emit tailpipe pollutants. Try reading up on fuel cells. A gallon of gasoline (6.2 kilograms, 2.8 kilograms) has approximately the same amount of energy as 2.2 gbp (1 kilogram) of hydrogen.
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an atom is made up of a positively-charged nucleus surrounded by negatively-charged electrons. the atom is neutral when there are equal numbers of protons and electrons. ions are formed when there are unequal numbers of protons and electrons in an atom. a positive ion is called a cation whereas a negative ion is called an anion.
To write the correct notation for the particular anion or cation, one should know/remember the atomic number of that particular atom, which is a electrons no.around the nucleus. For eg. Phosphorus (P) at.no. is 15
now P^+3 means phosphorus is lost 3e- then total e- will be 12e- around the nucleus
and P^-3 means phosphorus is gaining 3e- the we need to add 3e- to its at. no.
similarly we can write for any anion or cation based on its atomic no. and its oxidation states
(i) 12+ => Mg, 15+ => P
(a) Mg
(b) Mg^2+
(c) P
(d) Mg^2-
(e) P^3+
(f) P^3-
(ii) Be^2+ = He, N^3- = Ne, Mg^2+ = Ne, S^2- = Ar, Al^3+ = Ne, Br^- = Kr, Se^2 = Kr
(iii) Ion has 54 electrons, charge +2
=> atomic number = number of protons = 54 + 2 = 56
Element is Ba
Vitamin D receptor activation is known to enhance calcium and phosphorus absorption in the small intestine and to mildly increase calcium and phosphorus resorption in the skeleton as well as calcium absorption in the kidney [9].
Unattached or attached to an atom, an electron is a negatively charged subatomic particle (not bound). One of the three main types of particles inside an atom, along with protons and neutrons, is an electron that is linked to the atom.
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calculate the mass of air (in ounces) contained inside a soda bottle with an inner volume of 2.0 liters.
Volume of 2 L soda bottle contain 0.091 ounce mass of air.
Volume given 2 L
and, We know that density of air is 1.29 g/L
So, Density of air = mass of air/volume of air
Thus, 1.29 = mass of air/2
Mass of air = 2.58 g
In ounces; 1 g = 0.35 ounces
so 2.58 g = (2.58 × 0.35) ounces = 0.091 ounces
Hence volume of 2 L of soda bottle contain 0.091 ounces of mass.
What is Density ?
Density, mass of a unit volume of a material substance. The formula for density is d = M/V, where d is density, M is mass, and V is volume. Density is commonly expressed in units of grams per cubic centimetre.
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calculate the ph in the anode compartment after 5.00 minutes of electrolysis, assuming a final solution volume in the eudiometer of 80.0 ml.
The pH in the anode compartment is 3.01.
What is electrolysis?
The process of splitting water into hydrogen and oxygen using electricity is known as electrolysis. This reaction takes place in a device known as an electrolyzer.
What happens in electrolysis at anode?
The anode is the positive polarity contact in an electrolytic cell and is where oxidation occurs. The electrical potential forces anions (negative ions) to react chemically and give off electrons (oxidation) at the anode, which then flow up and into the drive circuit.
Reaction at anode:
[tex]2H_2O[/tex] → [tex]O_2 + 4H^+ + 4e^-[/tex]
Time = 5mins = 5 * 60s = 300s
Charge Q = I * T (current * Time)
Q = 0.0250 * 300 = 7.5C
Charge of single electron = [tex]1.6 * 10^-^1^9 C[/tex]
no. of electrons = total charge Q / charge on single electron
no. of electrons = 7.5 / [tex]1.6 * 10^-^1^9 C[/tex] = [tex]4.69 * 10^1^9[/tex]
Moles of electrons = no. of electrons / Avagadro no.
Moles of electrons = [tex]\frac{4.69 * 10^1^9 }{6.022 * 10^2^3}[/tex] = [tex]7.78* 10 ^-^5[/tex]
Given :
volume of solution = 80.0ml = 0.080l
According to the above reaction,
No of mole of [tex]e^-[/tex] = No. of mole of [tex]H^+[/tex]
Molarity of [tex]H^+[/tex] = moles of [tex]H^+[/tex] / volume of solution
Molarity of [tex]H^+[/tex] = [tex]\frac{7.78 * 10^-^5}{0.080}[/tex] = [tex]9.73 * 10^-^4M[/tex]
So,
pH = -log ([tex]H^+[/tex]) = -log( [tex]9.73 * 10^-^4M[/tex])
pH = 3.01
The pH in the anode compartment is 3.01.
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14.18 an alternating copolymer is known to have a number-average molecular weight of 250,000 g/mol and a degree of polymerization of 3420. if one of the repeat units is styrene, which of ethylene, propylene, tetrafluoroethylene, and vinyl chloride is the other repeat unit? why?'
An alternating copolymer is known to have a number-average molecular weight of 250,000 g/mol and a degree of polymerization of 3420. if one of the repeat units is styrene, which of ethylene, propylene, tetrafluoroethylene, and vinyl chloride is the other repeat unit? why?'
Propylene (C3H6) is a colorless gasoline gas with a naturally stinky odor. even though just like propane, it has a double bond which gives it a combustion gain i.e. it burns warmer. This fuel gasoline is extremely flammable and non-poisonous. Propylene is obtained throughout the refining of gas.
Gasoline is a aggregate of many different hydrogen- and carbon- containing chemicals (hydrocarbons). a typical fuel mixture includes about one hundred fifty exclusive hydrocarbons, including butane, pentane, isopentane and the BTEX compounds (benzene, ethylbenzene, toluene, and xylenes)
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an atom of 206pb has a mass of 205.974440 amu. calculate its binding energy in mev per nucleon. enter your answer with 4 significant figures and no units.use the masses:mass of 1h atom
The nucleus in question has a binding energy of 7.88 MeV/nucleon.
The subatomic particles that make up an atom's nucleus are known as nucleons. Protons and neutrons are nuclear particles.
We are given a nucleus having representation: 206 Pb
Number of protons = 82
Number. of neutrons. = 206 - 82 = 124
Δm = [(np × mp) + (nn × mn) - M
where,
np = number of protons = 82
mp = mass of one proton = 1.007825 amu
nn = number of neutrons = 124
mn = mass of one neutron = 1.008665 amu
M = nuclear mass = 205.974440 amu
Δm = [(82 × 1.0078725) + (124 × 1.008665)] - 205.974440
Δm = 1.74167amu
the binding energy of the nucleus, we use the equation:
E = Δm[tex]c^{2}[/tex]
E = (1.74167u) × [tex]c^{2}[/tex]
E = 1622.36MeV
1u = 931.5 MeV/[tex]c^{2}[/tex]
Number of nucleons in Fe atom = 206
the number of nucleons divided by the binding energy per nucleon yields:
Binding energy per nucleon = binding energy /nucleons = 7.88MeV/nucleon
binding energy is the amount of energy needed to separate a particle from a system of particles or to disperse all the particles in the system. Particularly relevant cases of binding energy include subatomic particles in atomic nuclei, electrons attached to atoms' nuclei, and atoms and ions bonded together in crystals.
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Student a says the δ h value of an exothermic energy change is always positive. Student b says δ h value of an exothermic energy change is always negative. Who is correct?.
Specific heat capacity of a substance is the amount of heat required to raise the temperature by one degree Celsius of one gram of a substance . Therefore, student a and student b are correct.
How does chemistry define temperature?The free energy from all of the particles or atoms in a substance is what chemists refer to as the substance's temperature. The kinetic energy of a substance's constituent particles varies.
Briefing :
q = n ×ΔH
where
q = amount of heat
n = no of moles
ΔH = enthalpy
n = w / M.M
Both students are correct as energy can be positive as well as negative. Any reaction in which energy is added, energy value comes out to be positive and reaction is called endothermic reaction. Any reaction in which energy is released, energy value comes out to be negative and reaction is called exothermic reaction.
Therefore, student a and student b are correct.
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