Answers
Answer:
The last one is true.
Related Questions
Malachite is a green colored mineral that is 57.5% copper. What mass of copper is present in a 250.0 g sample of malachite
Answers
57.5% Cu2(CO3)(OH) (OH) Other elements are also present in addition to copper.
To get the mass percent of copper in malachite (Cu2(OH)2CO3), apply the following formula:
Malachite (Cu2(OH)2CO3) has a molar mass of 2x63.5% + 2(16+1) + 12 + (16x3) = 127 + 2(17) + 12 + 48 = 127 + 34 + 12 + 48 = 221g/mol.
Cu2(OH)2CO3 has a Cu mass of 2 x 63.5g, or 127g.
The mass-based fraction of Cu in Cu2(OH)2CO3 is calculated as Cu2(OH)2CO3 mass per mol mass multiplied by 100 = 127/221 x 100 = 57.5%.
Malachite Cu2(OH)2CO3 has 57.5% of its mass in copper.
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Give an example of direct and indirect evidence geologists use to study the interior of the Earth
Answers
Direct evidence for the interior of the Earth comes from measurements and samples that are taken directly from the Earth's interior. This can include things like rock samples from deep mines, or measurements of seismic waves that have traveled through the Earth.
One example of direct evidence is rock samples that have been brought to the surface by volcanic eruptions or other means. These samples can provide geologists with information about the composition and structure of the Earth's interior. For example, by studying the minerals in a rock sample, geologists can infer the temperatures and pressures that existed in the Earth's interior when the rock was formed.
Indirect evidence, on the other hand, is information that has been inferred from measurements or observations that are not taken directly from the Earth's interior. One example of indirect evidence is the study of seismic waves, which are waves of energy that travel through the Earth's interior in response to earthquakes or other disturbances. By measuring the speed at which these seismic waves travel through the Earth, geologists can infer the density and composition of the materials that make up the Earth's interior.
In biology, a system is a collection of (blank)
(each made of multicellular tissues) that together perform a major function.
Answers
In biology, a system is a collection of organs (each made of multicellular tissues) that together perform a major function.
What is the organ about?In biology, a system refers to a collection of organs that work together to perform a specific function or set of functions. Organs are structures made of multiple types of tissues that work together to perform a specific task.
These tasks can be related to maintaining homeostasis, such as the circulatory system which transports oxygen and nutrients throughout the body, or to a specific function, such as the reproductive system which is responsible for the production of offspring.
Therefore, Organs within a system are highly specialized and have specific functions, but they also work together in concert to achieve the overall function of the system. For example, the digestive system is made up of several organs including the mouth, esophagus, stomach, small intestine, and large intestine.
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Define corrosion and explain the different basis of tendency or resistance of different
metals to corrosion
Answers
Corrosion is the process of chemical or electrochemical attack of materials by their external environment.
The tendency/resistance of different metals to corrosion largely depends on the composition of the metal. Iron and steel corrode in the presence of oxygen due to oxidation, while some metals such as chromium, nickel and molybdenum provide a protective layer of oxide film on the surface of the metal which is then resistant to corrosion. Other metals such as aluminum and zinc form sacrificial oxide layers which corrode and protect the metal from becoming completely damaged.
if 87 grams of K2SO4 (molar mass 174 grams) is dissolved in enough water to make 250 milliliters of solution, what are the concentrations of the potassium and the sulfate ions ?
[K+ ] [SO4^2]
A. 0.020 M 0.020 M
B. 1.0 M 2.0 M
C. 2.0 M 1.0 M
D. 2.0 M 2.0 M
E. 4.0 M 2.0 M
Answers
If 87 grams of K₂SO₄ is dissolved in enough water to make 250 milliliters of solution, the concentrations of the potassium [K⁺] is 4 M and the sulfate ions [SO₄²⁻] is 2 M.
The molar mass of the K₂SO₄ = 174 g/mol
The mass of the K₂SO₄ = 87 g
the moles of the K₂SO₄ = 87 / 174
= 0.50 mol
moles of K⁺ = 0.50 × 2
= 1 mol
moles of SO₄²⁻ = 0.50 × 1
= 0.50
The concentration of [K⁺] = 1 / 0.250 = 4 M
The concentration of [SO₄²⁻] = 0.50 / 0.250 = 2 M
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When 10g of hydrogen gas react with chlorine gas, how many liters hydrogen monochloride (HCl) will be produced at STP
Answers
The amount of hydrogen monochloride that is produced at STP is 152 mL.
The balanced chemical reaction can be depicted as follows:
H₂ + Cl₂ -----> 2 HCl
According to stoichiometry, When one mole of hydrogen reacts with one mole of chlorine, it yields two moles of hydrogen monochloride. Stoichiometry defines the relationship between the quantities of reactants and products before, during, and following chemical reactions
If, 2 g of Hydrogen reacts with 71 g of chlorine to form 73 g of Hydrogen Chloride.
Therefore, if 10 g reacts with 142 g of chlorine, the HCl produced will be 152 g or 152 ml of HCl.
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How will you justify presence of 18 elements in 5th period and presence of 32 elements in 6th period?
Answers
The orbitals within subshells are filled in the sequence of increasing energy. The filling can choose from the 5s, 4d, as well as 5p sub-shells. Consequently, there are 18 total components in period 5.
There are 18 atoms in the 5th grade of the periodic table, never 32. Reason l=0, 1, 2, and 3 and n=5. The energy of the accessible electron shells 4d, 5s, and 5p grows in the correct sequence: 5s4d5p. and since there are a total of 9 accessible orbitals, 18 electrons could fit.
The fourth period includes 18 elements owing to the 10 extra electrons which the 3d orbitals can hold since the 3d sublevel doesn't really fill before the 4s sublevel.
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What is the name of most reactive non-metal element on the periodic table?
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The name of most reactive non-metal element on the periodic table is fluorine
Fluorine is the nonmetal in the periodic table that is the most reactive.
On the Pauling scale, it has the highest electronegativity of any element (3.98). Fluorine is a highly reactive, diatomic gas that may mix with practically every other element to form compounds that have entirely different properties from either of the original components. The boiling point of fluorine is -188 °C (-310 °F).
Hydrofluoric acid and hydrogen fluoride gas are produced during the reaction with water: HF + H₂O ⇒H⁺ + HF + OH.
Chemical elements are shown on a periodic table in order of their atomic number. The classification of elements and their relationships to one another can be understood using the periodic table.
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The type of bonding and the number of covalent bonds an atom can form with other atoms is determined by __________
Answers
The type of bonding and the number of covalent bonds an atom can form with other atoms is determined by number of unpaired electrons.
The number of unpaired electrons in the valence shell because covalent bond is equal to a chemical bond that involves sharing a pair of electrons between atoms in a molecule. When electrons are shared among atoms, they make a bond known as a covalent bond. Because atoms are sharing one pair of electrons, this covalent bond is known as a single bond. These atoms can do the equal aspect that the H atoms did; they proportion their unpaired electrons to make a covalent bond.
Thus, the number of unpaired electrons is useful in the type of bonding and the number of covalent bonds.
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A ample of helium wa compreed at 35 °C from a volume of 0. 5 L to 0. 25 L where the preure i 500 mmHg. What wa the original preure?
Answers
The original pressure was 1000 mmHg.
What is pressure?Pressure is a force applied to a surface or object over a given area. Pressure can be generated in a variety of ways, including through mechanical force, electrical force, or through changes in temperature or chemical reactions. Pressure can be measured using a variety of devices, including a barometer, manometer, or gauge. Pressure is an important concept in many fields such as physics, engineering, chemistry, and medicine. It can be used to measure the force of a liquid or gas, the pressure of a liquid or gas, or the pressure at a certain depth in the ocean.
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which type of radioactive decay has the net effect of changing a neutron into a proton?
Answers
Answer: Beta Decay is the kind of radioactive decay that has the net effect of changing a neutron into a proton.
Explanation:
The opposite path, in which a neutron becomes a proton, is also possible. Exactly what happens is that a weak force changes the flavor of the card from top to bottom and vice versa. When this happens, the quark emits a W boson, which quickly decays into either an electron/antineutrino pair or a positron/neutrino pair, depending on the direction of change (neutron decays to protons, electron/antineutrino pairs are created).
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Which of the following are commonly used oxidizing agents? Select all that apply. O Hydrochloric add O Sodium dichromate O Chromic acid O Sodium borohydride
Answers
Sodium dichromate and chromic acid are commonly used as oxidizing agents.
Oxidizing agents are the compounds that can either accept hydrogen or electrons from the other molecules. It is a element or compound which participates in a oxidation-reduction reaction and accept electrons from the different species. By the acceptance of electrons from other substances, oxidizing agents cause their oxidation states to become more positive. Oxidizing agents are reduced as well. They can also transfer oxygen atoms to the molecules in some of the cases. Sodium dichromate and chromic acid are used to oxidize the other inorganic salts as well as alcohols.
Hydrochloric acid is a strong acid as well as sodium borohydride is a strong reducing agent.
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A sample of a substance was heated strongly in a crucible, and the sample increased in mass.
This is evidence that
A. A gas had been evolved.
B. The substance had melted.
C. The substance had sublimed.
D. A chemical change had taken place.
O E. A change of state had occurred.
Answers
When a sample of a substance was heated strongly in a crucible, the sample increased in mass. This is evidence that a chemical change has taken place.
In a closed system, when no heat or energy is applied, the mass of a substance will remain the same. But, when heated at high temperatures, the average kinetic energy of the particles of a substance increase due to which the particles will move faster, and collide with each other and take up more space. There will be transfer of energy due to application of heat. As a result of this the mass of the sample also increases.
Hence, option D is correct
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how many chlorine atoms are in 0.650 mol of ca(clo4)2?
Answers
Chlorine atoms that are present in 0.650 mol of ca(clo4)2 is : 7.83 *10^23.
What is meant by molar mass?Mass in grams of 1 mole of the substance is called the molar mass of a substance. We can obtain a substance's molar mass by summing the molar masses of its component atoms. We can use the calculated molar mass to convert between mass and number of moles of a substance.
As we know, one mole of any atom is equivalent to the Avogadro's number or 6.02 x 10²³ particles.
0.650 * 6.023 * 10^23 * 2
= 7.83 *10^23 chlorine atoms.
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What group could X be in if it forms ions with ammonium in the ratio of (NH4)3X?
X could be in Group
Answers
If it forms ions with ammonium in the ratio of (NH4)3X, X could be in Group IV A. Group IVA (14) metals form cations with +4 charge, although tin (Sn) and lead (Pb) can form cations having +2 charge.
What does the term "coordinate bond" mean?A covalent link (a shared pair of electrons) in which both electrons originate from the same atom is known as a coordinate bond (also known as a dative covalent bond). Two atoms sharing a pair of electrons make a covalent connection. Because the electron pair is drawn to both nuclei, the atoms are kept together.
How is a coordinate bond recognized?An arrow pointing from the donor to the acceptor, with a positive charge on the donor and a negative charge on the acceptor, is used to symbolize a coordinate bond.
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The poles of an electromagnet can even be reversed by reversing the flow of electricity true or false
Answers
By reversing the flow of electricity, the poles of an electromagnet may be reversed. As a result, the following statement is true.
An electromagnet is a magnet that uses electricity to operate. In contrast to a permanent magnet, the strength of an electromagnet may be readily altered by varying the amount of electric current flowing through it. By reversing the flow of electricity, the poles of an electromagnet can even be reversed.
When an electric current is passed through a wire, the magnetic field created can be concentrated within certain areas. This effect can be further strengthened by wrapping the wire around a stable core. Certain materials, such as iron, nickel and cobalt, have atoms that act like tiny magnets.
As the current flows around the core, increasing in intensity until all of the atoms are aligned, the magnetic field becomes stronger. At some point, however, this will happen and further increases in electric current will not affect the magnetization.
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Based on the structural formulas, which of the following identifies the compound that is more soluble in water and best helps to explain why ?
O Ethane, because the electron clouds of its molecules are more polarizable than those of propanol.
O Ethane, because its molecules can fit into the spaces between water molecules more easily than those of propanol can.
O Propanol, because its molecules have a greater mass than the molecules of ethane have.
O Propanol, because its molecules can form hydrogen bonds with water molecules.
Answers
Propanol, because its molecules can form hydrogen bonds with water molecules.
Reason:
Propanol contains a hydroxyl (-OH) group, which can form hydrogen bonds with the partially negative oxygen atoms in water molecules.This interaction increases the solubility of propanol in water.Ethane is a nonpolar hydrocarbon and it does not have any functional groups that can interact with water in this wayHydrogen bonding between propanol and water makes the solution more stable and thus more soluble.Nonpolar compounds like Ethane are not attracted to water molecules and are less likely to dissolve in them.Therefore, propanol is more soluble in water than Ethane.
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Between what is expected and what actually happens?
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Irony is a mismatch between what is expected and what actually occurs. These literary methods aid in the creation of dramatic effects in writing.
What is Irony?Irony is a disconnect between what is expected to happen and what actually happens. These types of literary devices help in creating a dramatic effect in literature.
Irony is a literary device which was used extensively in Greek tragedy. It involves expressing the meaning of something by making use of words which technically mean the opposite of the original thing being conveyed.
Irony is used for a dramatic or humorous effect. There are three types of irony seen in literature as follows:
• Verbal Irony
• Situational Irony
• Dramatic Irony
Verbal irony involves the usage of different words to mean something dissimilar to what they look like they actually mean.
Situational Irony means that what happens is totally different from what was expected to be happening.
Dramatic Irony occurs in plays, etc. where the audience or the readers are more aware of what is actually going on as compared to the character in the scene.
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What are the products of the following reaction?
OCH2CH2OH excess HBr--> heat
O Br - OCH2CH2Br
O Br + BrCH2CH2OH
O OH + BrCH2CH2Br
O Br + BrCH2CH2Br
Answers
The products of the reaction of OCH2CH2OH with excess HBr under heat are: OCH2CH2Br (2-bromoethanol) and BrCH2CH2OH (1-bromo-1-propanol)
The mechanism for the reaction of OCH2CH2OH with excess HBr under heat is a multi-step process that involves the formation of a carbocation intermediate. Step 1: Protonation of the oxygen atom in OCH2CH2OH by HBr to form a good leaving group (OH) and a carbocation intermediate.
Step 2: Bromine atom from HBr attacks the positively charged carbon of the carbocation intermediate to form a covalent bond, resulting in the formation of intermediate compound.Step 3: Deprotonation of the intermediate compound by the remaining hydroxyl group to give OCH2CH2Br (2-bromoethanol) and HBr
Step 4: the HBr molecule from the step 3 could protonate another molecule of OCH2CH2OH and repeat the step 1 to 3 to form BrCH2CH2Br (1-bromo-1-propanol) as second product.
Overall, the reaction is an electrophilic substitution reaction, with HBr as the electrophile and the oxygen atom of the alcohol as the nucleophile.
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a reaction such as A+B -> products that exhibits second-order kinetics can be studied using a large excess of one reactant. Under these conditions, the concentration of the reactant in excess will not change much during the reaction, which will exhibit _________-first-order kinetics.
Answers
a reaction such as A+B -> products that exhibits second-order kinetics can be studied using a large excess of one reactant. Under these conditions, the concentration of the reactant in excess will not change much during the reaction, which will exhibit pseudo-first-order kinetics.
A fraud or imposter is defined as something or someone that is false but attempts to pass for the real deal. Although it's typically a prefix, pseudo can refer to a faker. A pseudo-intellectual, for instance, will attempt to persuade you that he has a brilliant mind despite the fact that he does not. The fame of a pseudo-celebrity is minimal. A combining form with the meaning "false," "pretended," or "unreal," used in the creation of compound words (pseudo classic; pseudointellectual); in science, designating a close or deceptive resemblance to the following element (pseudobulb; pseudocarp); and occasionally used in the chemical names of isomers (pseudoephedrine). a person who professes to be skilled in academic or creative endeavours but lacks in-depth comprehension or critical thinking. a person who exaggerates their intelligence and engages in intelligence fraud.
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given a mixture of lead (2) oxide,ammonium chloride and sodium chloride,describe how this mixture can be separated to obtain a sample of each
Answers
Answer:
It can be done by crystallization, filtration, and sublimation. The easiest method among the three is separation by sublimation. Ammonium chloride sublimes upon heating. Actually, the sublimation is a decomposition of ammonium chloride forming ammonia and hydrogen chloride
Explanation:
A student performs an experiment several times to determine the enthalpy of combustion of naphthalene, an organic compound with the formula C10H8, and collects the following data: −5181. 6kJmol, −5181. 9kJmol, −5183. 5kJmol, −5180. 1kJmol, and −5184. 2kJmol. What is the relative standard deviation (RSD) for this set of data? Give the answer as a positive number
Answers
The relative standard deviation (RSD) for this set of data is 9.98.
What is the combustion enthalpy in kJ/mol?The enthalpy change that occurs when 1 mole of a substance burns (combines vigorously with oxygen) under standard state conditions is known as the standard enthalpy of combustion also known as the heat of combustion. The enthalpy of combustion of ethanol, for instance, is 1366.8 kJ/mol.
Total = -5182.6 - 5181.9 - 5183.5 - 5180.1 - 5184.2
Total = -25912.3
number of items = 5
mean = total sum / number of items
mean = -25912.3/5
mean = -5182.46
[tex]x_{i}[/tex] [tex]x_{i}[/tex]-µ ([tex]x_{i}[/tex]-µ)²
-5181.6 0.86 0.7396
-5181.9 0.3 0.09
-5181.5 -0.1 0.01
-5181.1 -0.5 0.25
-5181.2 -0.4 0.16
∑ ([tex]x_{i}[/tex]-µ)² = 1.2496
Standard deviation = √∑ ([tex]x_{i}[/tex]-µ)² /x
Standard deviation = √1.2496/5
Standard deviation = 0.499
Relative standard deviation = S x 100/x
Relative standard deviation = 0.499 ×100/5
Relative standard deviation = 9.98
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sodium is lost from the body in the ______.
Answers
Answer: In the sweat and urine
Explanation:
Sodium is part of body's mineral. It will easily go out or lose when we we sweat and when we urinate. They lost from the body in form of water contained sodium.
A ring stand is used to ________ devices during laboratory procedures.
Answers
A ring stand is used to hold glassware devices during laboratory procedures.
Ring stands and accessories can make your lab experiments much easier if you are studying chemistry or physics.
A ring stand and its accessories are versatile pieces of equipment that will improve your hands-on activities by allowing you to conveniently heat beakers, flasks, test tubes, and other glassware over an alcohol burner, as well as set up physics apparatus such as moveable pulleys and inclined planes.
Each accessory is supported by a heavy base and an upright rod on the ring stand. To support additional equipment, a ring support is attached to the stand. Glassware is supported above an alcohol burner by wire gauze resting on the ring. To support funnels, crucibles, and evaporating dishes, the triangle rests on the ring. Burettes and test tubes are held in the burette clamp.
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naproxen (Aleve): 73.03%C, 6.13%H, and 20.84%O Express your answer as a chemical formula?
Answers
If the molecular weight is 230.26 g/mol carbon = 73.03% = 230.26*73.03/100 = 168.15/12 = 14 Carbons Hydrogen = 6.13% = 230.26*6.13/100 = 14/1 = 14 Hydrogens Oxigen = 20.84% = 230.26*20.84/100 = 47.98/16 = 3 Oxygens Hence the empirical formula is C14H14O3
What is a weight example?The International System for Units (SI) defines the newton as the unit of force, which is used to measure weight. For instance, a kilogram of matter weighs around 9.8 newtons on Earth's surface and around each as much on Moon.
How are weights determined?Weight, which is expressed in newtons, is a unit of measurement for the gravitational force acting on an object. The mass of a bird with a mass of 15 g changes with the strength of the gravity influence acting on it, and would differ significantly if it were measured, for instance, on the Moon rather than on Earth.
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6.
In Period 2, as the elements are considered from
left to right, there is a decrease in
BO
A.
ionization energy
B.
atomic masS
C.
metallic
character
D. nonmetallic character
Answers
Please give brainliest I need one more!!!!!!!!!!!!
The volume of a given mass of gas varies inversely as its pressure. If the volume is 10dm3 when the pressure is 6atm, Find the pressure when the volume is doubled.
Answers
To solve this we must be knowing each and every concept related to ideal gas equation. Therefore, the pressure when the volume is doubled is 3atm.
What is ideal gas equation?Ideal gas equation is the mathematical expression that relates pressure volume and temperature.
Mathematically the relation between Pressure, volume and temperature can be given as
PV=nRT
where,
P = pressure of gas
V= volume of gas
n =number of moles of gas
T =temperature of gas
R = Gas constant = 0.0821 L.atm/K.mol
rearranging the above equation, we get
P₁V₁= P₂V₂
{ (6atm) (10dm[tex]_3[/tex])} ={ ( P₂) (20dm[tex]_3[/tex])}
P₂ = 3atm
Therefore, the pressure when the volume is doubled is 3atm.
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H+ ions increase in concentration at lower pH values. Calculate how many more H+ ions there are in a solution at a pH = 2 than in a solution at a pH = 6. Find the concentration of H+ ions at a pH = 2 and at a pH = 6 in Table B. Then divide the concentration of H+ ions at a
pH = 2 by the of H+ ions at a pH = 6. Record your answer in Table C.
What is the concentration of H+ ions at a pH = 2?
mol/L
What is the concentration of H+ ions at a pH = 6?
mol/L
How many more H+ ions are there in a solution at a
pH = 2 than in a solution at a pH = 6?
need ASAP give
brainliest
Answers
The number of hydrogen ions, H⁺, that are there in a solution at a
the pH of 2 than in a solution at a pH of 6 is 1000 or 10⁴.
What is the pH of a solution?The pH of a solution is the negative logarithm in base 10 of the hydrogen ion concentration of the solution.
pH = - log [H⁺]
Hence, the hydrogen ion concentration of a solution whose pH is given is determined using the formula given below as follows:
[tex][H^{+}] = 10^{-pH}[/tex]
For the solution of pH of 2
[H⁺] = 10⁻²
[H⁺] = 0.01 M
For the solution of pH of 6
[H⁺] = 10⁻⁶
[H⁺] = 0.000001 M
The ratio of the hydrogen ion concentration of the solutions will be:
Ratio of hydrogen ions = 0.01 / 0.000001 M
Ratio of hydrogen ions = 10000 or 10⁴
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How does glycolysis make 32 ATP?
Answers
Both anaerobic and aerobic conditions can result in glycolysis. Pyruvate joins the citric acid cycle under aerobic conditions and proceeds through oxidative phosphorylation, which results in the net synthesis of 32 ATP molecules.
What is an example of anaerobic activity?Anaerobic exercises require small bursts of energy and are finished rapidly while exerting maximum effort. Examples include jumping, jogging, and hard weightlifting. Your breathing and heart rate alter as you engage in aerobic vs anaerobic activities. During aerobic workouts, oxygen is your major source of energy.
What exactly does it mean to be anaerobic?Anaerobic means "without oxygen," whereas aerobic indicates the existence of oxygen. Both are important for your overall health since they put your body through different difficulties. Anaerobic exercise consists of short bursts of high-intensity activity that do not demand your body to consume oxygen as it would during cardio (or aerobic) exercise.
Here,
Glycolysis can occur under both anaerobic and aerobic settings. Under aerobic circumstances, pyruvate enters the citric acid cycle and goes through oxidative phosphorylation, resulting in the net production of 32 ATP molecules.
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What is the E0cell? Mg 2+|Mg and Ci2|Ci
Answers
The E0cell for the halfcell that we have in the question is 3.73 V.
What is the cell potential?We have to know that the cell potential as we know it has to do with the electrical potential that is involved when we have the oxidation or the reduction of a given specie. In the case of what we have here, we have the cells that are composed of magnesium and chlorine and we want to find the electrode potential of the cells.
We must note that the basis that we can be able to use to find the electrode potential of the cell is the standard hydrogen electrode which has been assigned the value of about 0.00 V and all of the other cell potentials that we have can now be measured against this standard that has been fixed.
We have;
Magnesium half cell= -2.37 V
Chlorine half cell = + 1.36 V
Then we have;
E0cell = + 1.36 - (-2.37)
= 3.73 V
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