The mole fraction of C₂H₆O₂ in 12. 7 molal aqueous solution is 12.7.
What is mole fraction?In chemistry, a mole fraction is the ratio of the moles of one component in a solution or other mixture to the sum of the moles of all the components.
The ratio of the moles of any component to the sum of the moles of all the other components in the mixture is known as the mole fraction. Each gas's partial pressure in a mixture of gases is calculated by multiplying its mole fraction by its total pressure.
The number of solute molecules divided by the sum of the solute molecules and the solvent molecules is known as the mole fraction. This is equal to how many moles of solute there are in a liter of solvent, expressed in molal. If the molal equivalent C₂H₆O₂ is 12.7 this means, all that is in the solution is solute. Hence the mole fraction of C₂H₆O₂ is 12.7.
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Freddy mixes a solid chemical with a liquid chemical and generates a chemical reaction. What can be said about any mixture of chemicals he used
Many of these, including cheese, gelatin, and various inks, are commonplace. Like the other classes, mixtures of solids and liquids may be separated in many ways.
science has been actively involved in the pursuit of this goal since it is crucial for a variety of liquids. When two or more distinct substances physically join, a mixture is produced that can be dispersed back into its constituent parts. a bowl of various candies, a pile of various leaves, steel, and sugar syrup A gelatin is any two or more different types of particles together. These particles are physically bound together rather than reacting chemically with one another. Two or more reactants are changed into one or more separate products during a chemical reaction. Alternately, we might assume that a chemical reaction rearranges the atoms of the reactants to create new products.
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3. Contrast the three size-dependent physical properties. Next, circle the property
that changes with location.
Mass
Size-Dependent Properties
Weight
Volume
Ligh Spice
Physical characteristics known as size dependant properties alter as an object's size does. Examples of qualities that depend on size include length, width, height, volume, and mass.
What are the physical characteristics of an object that rely on its size?The amount or size of the material affects several physical properties of matter, including length, mass, volume, weight, and so forth. These characteristics of matter and their values change together with the size or quantity of the substance.
What is a characteristic of mass?In physics, mass is a way to measure inertia, a fundamental property of all matter. In actuality, it is the resistance a body of matter provides to a change in its speed or location.
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In regard to the E2 mechanism, rank the leaving groups in order of increasing reaction rate.
Slowest
Fastest
R-F R-I R-Cl R-Br
In the E2 mechanism, the rate of the reaction is affected by the strength of the bond between the leaving group and the carbon atom, as well as the stability of the resulting carbocation intermediate.
The order of the leaving groups in terms of increasing reaction rate would be:
Slowest: R-F
R-F is a relatively weak bond and the fluoride ion is a very poor leaving group, so the reaction rate would be slow.
R-Br
R-Cl
R-I
Fastest: R-I
R-I is a relatively strong bond and the iodide ion is a very good leaving group, so the reaction rate would be fastest.
R-Cl
R-Br
In short, the stability of the leaving group decreases as the atomic number of the atom increases, and the bond dissociation energy of the leaving group also decreases. So, it is Iodide>Chloride>Bromide>Fluoride.
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Which is the best way to prepare 3-methoxypentane via the Williamson method? ( please explain why)
A). CH3OH + CH3CH2CHOHCH2CH3 + H2SO4, 140'C
B). CH3OH + (CH3)2 CHCH2CH2OH+ H2SO4, 140' C
C). CH3ONa + (CH3CH2)2CHBr
D). CH3 I + (CH3CH2)2CHONa
The best way to prepare 3-methoxypentane via the Williamson method is : D). CH3 I + (CH3CH2)2CHONa.
What is Williamson method?The most used technique for making ethers is the Williamson ether synthesis. A metal alkoxide displaces a halide ion from an alkyl halide in an SN2 reaction, which is how it happens. An alcohol and a potent base, such as sodium hydride, react to form the alkoxide ion.
Williamson synthesis is employed in the creation of both simple and mixed ethers. Alcoholic sodium or potassium alkoxide is heated with alkyl halide to create the appropriate ethers. ROR+NaX ROR+ONa+X. Methyl iodide produces dimethyl ether when heated in the presence of alcoholic sodium methoxide.
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What could occur if the feedback loop of the knee je rk reflex was cut off at any points along its path?
If the feedback loop of the knee reflex was cut off at any points along its path, then there will be no response of knee reflex.
What does it mean if you don't have a knee reflex?Its results in harm to any part of your reflex arc, which can be due to a basic knee-medicinal condition. Healthcare suppliers can disclose hyporeflexia by spouting your knee with a rubber hammer.
If your doctor taps on a band and there isn't a reflexive movement in the muscle, it's a sign of knee-health matter. Usually, absent reflexes are created by an issue with the nerves in the tendon and muscle. You may have other muscle symptoms along with areflexia, like weakness, or atrophy.
So we can conclude that A decline reflex reply can be related to peripheral knee-nervous system disorders.
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A solution is created by dissolving 12.0 grams of ammonium chloride in enough water to make 255 mL of solution. How many moles of ammonium chloride are present in the resulting solution
The number of moles of ammonium chloride present in a solution created by dissolving 12 grams of ammonium chloride in water to make 255 ml solution is 0.224 mol.
The number of moles of a substance is defined as the ratio of the mass of the substance to the molar mass of the substance. It is denoted by "n". It is given as
n=mass/molar mass
Given,
mass of ammonium chloride= 12 grams
we know that,
atomic mass of Nitrogen(N) = 14g /mol
atomic mass of Hydrogen (H) = 1 g/mol
atomic mass of Chlorine (Cl)= 35.5 g/mol
molar mass of ammonium chloride (NH₄Cl)
= ( 14+ 1×4 + 35.5) g/mol
=53.5 g/mol
therefore,
number of moles of ammonium chloride
= mass/molar mass
=12g/53.5gmol⁻¹
=0.224 mol
Thus, 0.224 moles of ammonium chloride are present in the resulting solution.
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A 2.317 gram sample of an oxide of iron was found to contain 1.677 grams of iron and 0.640 grams of oxygen. What is the simplest formula for this compound?
The simplest formula for a compound is made up of 1.677 grams of iron and 0.640 grams of oxygen would be FeO.
Empirical formulaWhat the question is asking here is the empirical formula of an oxide of iron made up of 1.677 grams of iron and 0.640 grams of oxygen. The empirical formula shows the formula in the simplest whole-number ratio of the atoms.
Iron (Fe) = 1.677 grams
Oxygen (O) = 0.640 grams
Converting the masses to moles:
Fe = 1.677/56 = 0.0299 mol
O = 0.640/16 = 0.0400 mol
Now, let's divide by the smallest mole:
Fe = 0.0299/0.0299 = 1.0
O = 0.0400/0.0299 = 1.3
Thus, the empirical formula of the oxide of iron is FeO.
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How does oxygen affect orcas?
The orcas will compensate the lack of the oxygen that being respired for the minute at time and with the high amount of the hemoglobin in the blood.
The orcas will be able to slow down their heart beat when they are diving . this will decrease the amount of the oxygen demand but this not good for them it will be very stressful on their body.
The hemoglobin will increase the efficiency of their respiration. The orcas are the sea mammals . the orcas will be dive for the long period of the time in to the water. They will easily breathe through blowhole.
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What is the relative rate of diffusion of CH4 and NO2?
The ratio of effusion rates of Sulphur dioxide and methane is 0.5
To calculate the rate of diffusion of gas, we use Graham's Law.
This law states that the rate of effusion or diffusion of gas is inversely proportional to the square root of the molar mass of the gas. The equation given by this law follows the equation:
Rate of Diffusion ∝ 1 ÷ √molar mass of the gas
We are given:
Molar mass of Sulphur dioxide = 64.066 g/mol
Molar mass of methane = 16.04 g/mol
By taking their ratio, we get:
Rate of SO₂ ÷ Rate of CH₄ = √MCH₄ ÷ √MSO₂
Rate of SO₂ ÷ Rate of CH₄ = √16.04 ÷ √64.066
Rate of SO₂ ÷ Rate of CH₄ = 0.5
Hence, the ratio of rate of effusion of Sulphur dioxide and methane will be 0.5
A force of 180 N to the right and a force of 180 N to the left.
Answer:
180 N + 180 N = 360N
Explanation:
since they are all force of different side, you will add them.
A 16. 81 gram sample of an organic compound containing C, H and O is analyzed by combustion analysis and 21. 33 grams of CO2 and 5. 822 grams of H2O are produced. In a separate experiment, the molar mass is found to be 104. 1 g/mol. Determine the empirical formula and the molecular formula of the organic compound
A 16. 81 gram sample of an organic compound containing C, H and O is analyzed by combustion analysis and 21. 33 grams of CO₂ and 5. 822 grams of H₂O are produced. In a separate experiment, the molar mass is found to be 104. 1 g/mol. The empirical formula is CH₃ and molecular formula is C₇H₇O₂₁
The empirical formula can be calculate as follows:
The reaction can be write
CxHyOz → CO₂ + H₂O
As a result, we may state that there are two O-atoms for every one C-atom (12g) in CO2 (32g).
This indicates that the ratio is 12g C/32g O.
The molar mass of CO₂ is 44 g/mole.
(12/44) x 33 = 9 g
There are 9 grams of carbon in every 33 grams of CO₂
The same can be done for water:
In H₂O, each element is represented by two H atoms and one O atom. 2 g H and 16 g O.
[2 g H / 18 g H2O] are present in 5. 822 g of water
(2/18)x 5.822= 0.6468 g
The initial sample had 14.16 g of sample, 9 g of C, and 0.6468 g of H, which resulted in 34.3532g of oxygen.
Determine the amount of moles.
C: 9.0 g / 12.0 g/mol = 0.75 mol
H: 0.6468 g / 1.0 g/mol = 0.6468 mol
O: 34.3532g / 16.0 g/mol = 2.14 mol
Then we divide by the smallest number
C: 0.75 mol / 0.6468 mol = 1
H: 0.6468 mol / 0.6468 mol= 1
O: 2.14 mol/ 0.6468 mol = 3
so the empirical formula will be CH₃
Determine the molecular formula
mass molecular formula / mass of empirical formula = n
We have to multiply the empirical formula by n to get the molecular formula.
104.1 /15 = 7= n
This means the molecular formula = C₇H₇O₂₁
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How many moles are there in 2.87x10^23 molecules C3H8?
Answer:
0,5 moles
Explanation:
N = L × n
n = N ÷ L
n = 2,87 × 10²³ ÷ 6,02 × 10²³
n = 2,87 ÷ 6,02
n = 0,47 moles or 0,5 moles
Use the following reaction: HI(g) ----à H2(g) + I2(g) a) Express the rate of reaction in terms of the change in concentration of each reactants & products. B) When [I2] is increasing at 2 mol/L-s, what is the rate as to how fast is [HI] decreasing? Show your relationships in your calculation set up for full credit. A)
a) The change in concentration of each reactant and product as a function of reaction rate is − Δ[H₂]/Δt = -Δ[I₂]/Δt = +1/2Δ[HI]/Δt.
b) The rate as to how fast is [HI] decreasing is 4 mol/[tex]L^{-s}[/tex].
An easy explanation of a chemical reaction.A chemical reaction is the process by which a single or more reactants change into a single or more new products. Chemical building blocks or compounds make up substances.
Given balance chemical reaction,
H₂(g) + I₂(g) → 2HI(g)
a) The rate of reaction in terms of the change in concentration of each reactants & products is
Rate = − Δ[H₂]/Δt = -Δ[I₂]/Δt = +1/2Δ[HI]/Δt
b) where 2, 1, 1 and stoichiometric coefficients of HI, H₂ and I₂ respectively.
where - sign indicates consumption and + ve sign indicates formation
given d[I₂]/dt =2
-d[HI]/2dt= 2
-d[HI]/dt = 4 mol/[tex]L^{-s}[/tex].
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what type of bond is found in chlorine molecules
Answer: It is a Covalent Bond
Explanation:
In a chlorine molecule, the atoms bonded by a covalent bond as a chlorine atom needs one electron to complete its octet and shares one electron with another chlorine atom.
Answer:
mono covalent bonds
Explanation:
Cl shares 1 electron with another Cl atom
so it makes Cl2 a mono covalent compound
describe the phase and temperature chacges that will occur if you heat 50.0 g of h2o in its solid state at -8 C until it all vaporizes
The phase and temperature changes that will occur if you heat 50.0 g of H2O in its solid state at -8 C until it all vaporizes is that the solid H2O will transition to a liquid state at 0 C and then to a vapor at 100 C.
What is vapor?Vapor is an aerosolized suspension of tiny liquid particles that are released into the air. It is made up of a mixture of water and other chemicals, such as nicotine, propylene glycol, and other flavorings. Vapor is produced when heated liquid, such as e-liquid, is turned into a vapor. This vapor can be inhaled and exhaled in a manner similar to smoking a traditional cigarette, which is why vapor has become an alternative to traditional smoking.
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Can you divide equation I by another factor and still have it be correct?
Equation I cannot be divided by another factor as it will introduce errors in the equation.
What are errors?Errors in chemical analysis result when there is a difference between observed value and the true value.If the magnitude of errors is large , it results in decrease in accuracy, reproducibility, and precision.
There are three types of errors:1) random error 2) systematic error 3) human error.The cause of random errors are difficult to quantify while the human errors can be minimized by taking a range of readings to reduce the error.
Errors while measuring boiling point may be human errors while noting down the boiling temperature or instrumental or systematic error if there is a fault in the thermometer.
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What is the name of an isotope that has 14 protons and 14 neutrons?
The name of an isotope that has 14 protons and 14 neutrons is Silicon-28
The total number of protons and neutrons in an isotope's nucleus is referred to as the mass number. This is due to the fact that each proton and neutron has a mass of one atomic mass unit.
We may get the mass of the atom by multiplying the total number of protons and neutrons by 1 amu.
The atomic number Z is 14 if there are 14 protons. Z being the quantity of large positively charged nuclear particles by definition.
Silicon is what we have if Z is the atom's identity and Z=14. The isotope of the element is 28S because the element may contain more or fewer neutrons than Z, where neutrons are heavy, neutrally charged nuclear particles.
Silicon-28 is the isotope with 14 protons and 14 neutrons.
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A mixture contains only NaCl and Al2(SO4)3. A 1.68-g sample of the mixture is dissolved in water and an excess of NaOH is added, producing a precipitate of Al(OH)3. The precipitate is filtered, dried, and weighed. The mass of the precipitate is 0.116 g. What is the mass percent of Al2(SO4)3 in the sample
The precipitate is collected, filtered, dried, and weighed.. The mass of the precipitate is 0.116 g.
What is dissolved?Dissolved refers to a solute that is completely dissolved in a solvent, resulting in a homogeneous mixture. When a solute, such as a salt, is dissolved in a solvent, such as water, the molecules of each component are dispersed evenly throughout the mixture. This process can be reversed by evaporating the solvent, leaving the solute behind. The amount of solute that can be dissolved in a particular solvent is known as its solubility.
Mass of Al2(SO4)3= Mass of sample- Mass of precipitate
Mass of Al2(SO4)3= 1.68-0.116=1.564 g
Percent of Al2(SO4)3= (1.564/1.68)*100= 93.45 %
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What numbers do I put on the right side?
The leftovers of [tex]C_2H_2[/tex] will be 6 moles while the leftover of [tex]O_2[/tex] will be zero.
Mole ratio of reactantsIn the originally balanced equation of the reaction, 2 moles of [tex]C_2H_2[/tex] and 5 moles of [tex]O_2[/tex] react completely to produce 4 moles of [tex]CO_2[/tex] and 2 moles of [tex]H_2O[/tex]. This equation is balanced with no reactant left.
Now, 8 moles of [tex]C_2H_2[/tex] were made to react with 5 moles of [tex]O_2[/tex] in the second reaction. The mole ratio of the two reactants for complete reactions is 2:5. Thus, [tex]C_2H_2[/tex] has been supplied in excess.
Since only 5 moles of [tex]O_2[/tex] is available, only 2 moles of [tex]C_2H_2[/tex] will be consumed. Thus, 6 moles of [tex]C_2H_2[/tex] will be left while the oxygen will be completely consumed. That is, the amount of [tex]O_2[/tex] left would be zero.
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Beryllium iodide + strontium sulfate --->
Normal:
Complete ionic:
Net ionic:
Normal
BeI2 + SrSO4 → SrI2 + BeSO4
Complete ionic:
Be2+ + 2I- + Sr2+ + SO42- → Sr2+ + 2I- + Be2+ + SO42-
Net ionic:
Be2+ + 2I- → Sr2+ + 2I- + Be2+
The complete ionic equation for this reaction is the same as the normal equation, except that the reactants and products are written as their respective ions.
The net ionic equation is the same as the complete ionic equation, except that the spectator ions, which are ions that appear on both the reactant and product sides, are omitted.
In this reaction, strontium sulfate and beryllium iodide react to form strontium iodide and beryllium sulfate. The spectator ions are Sr2+ and 2I-, which appear on both sides of the equation and cancel out, leaving the net ionic equation.
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legit need help asap
ignore the screenshot stuff
BUT LIKE
HELP
Answer:
a.LiF
b.BeO
c.MgF2
d.AlCl3
e.Be3N2
Explanation:
So, the main thing with chemical formulas is making sure that the cation and anion's charges will cancel out if you add the total sum of charges together.
For A, halogens only form -1 charge ions, so F will have to be F-. Lithium, being a group 1 element, will form an ion of Na+. Therefore, the formula is NaF.
For B, Beryllium is a Group 2 element that forms +2 charges, while Group 16 elements like O form -2 charges. Therefore, BeO would work as the sum of charges will equal zero.
For C, Magnesium is a Group 2 element, so it has a +2 ion, while fluorine is a halogen, so a -1 charge for the F- ion. So, you need two F- ions to balance out one Mg2+ ion. So, it is MgF2
For D, Aluminum is a Group 13 element, which can form +3 charges. Therefore, Al can form a +3 charge, so that means for Cl- (recall it is a halogen,) it needs three Cl- ions to cancel one Al3+ ion. So, it is AlCl3.
For E, Group 15 elements like N form -3 ions, so the ion for nitrogen is N3-. Beryllium is a Group 2 element, so it is Be2+. The common multiple of 3 and 2 is 6, so you need to find a way to have a +6 and -6 charge. So, three Be2+ ions (totaling a net charge of +6) need to cancel with two N3- ions (again a net charge of -6) to form the compound. Therefore, it is Be3N2.
How do you know if an element is reactive or not?
The reactivity of an element depends upon the number of valence electrons, i.e., the electrons present in the outermost shell.
The number of electrons withinside the outermost shell of an atom determines its reactivity. Noble gases have low reactivity due to the fact they've complete electron shells. Halogens are extraordinarily reactive due to the fact they with ease advantage an electron to fill their outermost shell. Non-reactive metal atoms have whole outer shells and therefore do now no longer generally tend to lose, advantage, or percentage electrons. So, all factors having a crammed outermost shell are non-reactive. They also are referred to as noble gases. An element's reactivity is decided via way of means of the number of protons determined in an atom of the element.
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Use information from the reaction to design an experiment that could be used to remove the tarnish (Ag2S) from a silver fork
Line a basin with foil, add a teaspoon of bicarbonate of soda and a sprinkle of salt, and then pour in hot water. The tarnished silver object may then be immersed in water, ensuring sure it comes into touch with the aluminum foil, as well as the silver sulphide tarnish will quickly dissipate.
Tarnish is caused by a chemical interaction between silver and sulfur-containing compounds in the air. Silver sulphide is formed when silver combines with sulphur. Silver sulphide is a dark substance. A thin layer of silver sulphide grows on the surface of silver, darkening it.
Experimental design is a technique that enables scientists and engineers to efficiently assess the effect of multiple inputs, or factors, on measures of performance, or responses. A bone density research, for example, contains three experimental groups: a control group, the stretching exercise group, as well as a jumping exercise group. In a between-subjects experiment, investigators allocate each participant to one of three groups at random. While silver is the most commonly linked with tarnishing, it may occur on almost every metal, including aluminum, copper, and brass.
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hi, this is chemistry if anyone would help, it would be great :)
To solve this we must be knowing each and every concept related to atom and its discoveries. Therefore, electron was discovered by J.J Thomson.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron. Electron was discovered by J.J Thomson.
Therefore, electron was discovered by J.J Thomson.
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The kind of molecular motion that mostly relates to the temperature of a substance is
A) translational motion.
B) rotational motion.
C) vibrational motion.
D) all about equally
The kind of molecular motion that mostly relates to temperature of a substance is : A) translational motion.
What is meant by translational motion?Motion in which all the points of a moving body moves uniformly in the same direction. If object is undergoing translatory motion, we can see that there is no change in the orientation of object. Translatory motion is also called translational motion.
In kinetic theory of gasses, increasing the temperature of a gas increases the average kinetic energy of the molecules, causing an increased motion. This increased motion increases outward pressure of the gas, which an expected result from the ideal gas equation (PV=NkT).
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Instructions: Use the following scenario for questions 2 and 3.
Scenario: The chef places cold water in a pot, places the pot on the stove, and monitors its temperature as time passes. Which of these BEST describes the changes the chef sees occurring at different stages of heating the pot of water?
Before the water begins to boil, thermal energy _____.
remains the same.
increases.
decreases.
Thermal energy increases before the water begins to boil.
Thermal energy is produced when the atoms and molecules in matter vibrate faster due to an increase in temperature. As the average kinetic energy of its particles increases, the thermal energy of the object increases.
After reaching water at its boiling point thermal energy remain same because temperature remain constant after reaching once at boiling point. Thermal energy is directly proportional to temperature. Hence, chef will notice two phenomena during water begins to boil.
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Base your answer to the following question on the elements below. (A) Boron (B) Rubidium (C) Nitrogen (D) Mercury A highly reactive element A) A B) B C) C D) D
B) Rubidium is a highly reactive element.
Rubidium is a highly reactive element due to its low ionization energy, which makes it easily lose electrons and form compounds. It is considered to be one of the most reactive alkali metals.
When it comes into contact with water or air making rubidium is highly flammable. It can ignite spontaneously in the air and reacts violently with water to produce rubidium hydroxide and hydrogen gas.
Being noticeably more reactive than potassium but less so than cesium, it is likely to react with substances that are dangerous with sodium or potassium more forcefully. When rubidium is exposed to air or dry oxygen, it ignites, mostly generating oxide.
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What is metallurgy ?
Answer:
according to the Oxford dictionary, metallurgy the branch of science and technology concerned with the properties of metals and their production and purification
Explanation:
Explanation:
The entire scientific and technological process used for isolation of the metal from its ores is known as metallurgy.
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The quantity of matter in a body,object,or substance.Mass is measured in the metric system in units if grams kilograms ,milligrams,etc is it A. Work or B.Mass?
The quantity of matter in a body,object,or substance is B. Mass.
What is Mass?A body's mass is an inherent quality. Prior to the discovery of the atom and particle physics, it was widely believed to be related to the amount of matter in a physical body.
It is the most fundamental characteristic of matter and one of the fundamental quantities in physics. Mass is a term used to describe how much matter is present in a body. The kilogram is the SI unit of mass (kg). A body's mass does not alter at any point in time.
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If we react 14 moles of oxygen with five moles of ethane how many moles of carbon dioxide would we make
Answer:46 moles of carbon dioxide and 12 moles of ethane.
Explanation:
46 moles of carbon dioxide and 12 moles of ethane.
What is Carbon dioxide?A non-flammable, colorless gas, carbon dioxide is. While being far less common in the atmosphere than nitrogen and oxygen, carbon dioxide plays a crucial influence in determining the composition of the air on our planet.
Carbon dioxide, a colourless gas having a faint sharp odour and a sour taste. It is one of the most important greenhouse gases linked to global warming, but it is a minor component of Earth’s atmosphere .
It is formed in combustion of carbon-containing materials, in fermentation, and in respiration of animals and employed by plants in the photosynthesis of carbohydrates.
Therefore, 46 moles of carbon dioxide and 12 moles of ethane.
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