Be has the lowest electronegativity. This is because electronegativity generally increases as you move down a group and to the right of a period, and Be is located at the top left of the periodic table.
Which element has the least metallic character?Li has the least metallic character. This is because metallic character generally decreases as you move down a group and to the right of a period, and Li is located at the top left of the periodic table.
Which element is the largest atom?Mg has the largest atom. This is because atomic radius generally increases as you move down a group and to the left of a period, and Mg is located in the middle of the second period.
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What is the molarity of sucrose c12h22o11 if 20g of it is dissolved in water to make the volume of the solution upto 2 Litres?
The molarity of sucrose c12h22o11 if 20g of it is dissolved in water to make the volume of the solution upto 2 Litres is 0.029 mol/L.
What is molarity, for instance?The moles of solute per liter of solution is measured as molarity. Molarity, also referred to as molar concentration, is denoted by the letter "M".
We divide the number of moles of solute by the total volume of liters of solution to determine the molarity of a solution.
For instance, when table salt is dissolved in water, water serves as both the solution and the solute. Sodium chloride weights 58.44 grams per mole. One molar solution, or 1M, is created by dissolving 58.44 grams of sodium chloride in one liter of water.
Molar mass of C₁₂H₂₂O₁₁ is
12(12) + 22(1) + 11(16)
= 342g/mol.
Molarity is defined as = Mass / Molar Mass × Volume.
Sugar (C₁₂H₂₂O₁₁) has a concentration of
20 / 342 2 = 0.029 mol/L.
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What is parabola example?
The water that is shot up into the air by the fountain takes a parabolic path while coming down is the best example of parabola.
Parabola
A parabola is a plane curve which is mirror-symmetrical and is approximately U-shaped. It fits several superficially different mathematical descriptions, which can all be proved to define exactly the same curves.
Parabolas have the property that, if they are made of material that reflects light, then light that travels parallel to the axis of symmetry of a parabola and strikes its concave side is reflected to its focus, regardless of where on the parabola the reflection occurs. Conversely, light that originates from a point source at the focus is reflected into a parallel beam, leaving the parabola parallel to the axis of symmetry.
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Write any two differences between catalyst and promoter along with examples.
Answer:
Explanation:
The main difference between a catalyst and a promoter is the mechanism by which they affect a chemical reaction. A catalyst speeds up a chemical reaction by providing an alternative pathway for the reactants to follow that has a lower activation energy. A promoter, on the other hand, influences the rate of a chemical reaction by changing the adsorption and desorption of reactants on the surface of a catalyst.
Another difference between a catalyst and a promoter is the extent of their effect on the reaction rate. A catalyst generally has a much greater impact on the rate of a chemical reaction than a promoter. For example, a catalyst might increase the rate of a reaction by a factor of 10^6 or more, while a promoter might only increase the rate by a factor of 10 or 100.
Examples:
Platinum is a common catalyst used in the process of catalytic converter, which is used to reduce the emissions of harmful gases from automobile exhaust.
Alumina (aluminum oxide) is often used as a promoter in the production of synthetic fuels from coal or natural gas. The alumina helps to increase the rate at which the reactants are converted to the desired product, resulting in a more efficient and cost-effective process.
If you have two objects that are relatively the same size, but when placed in water one
of the object sinks and the other floats. What can you predict based off this observation?
Answer:
it is it is because both of the items have different density which makes one of the item which are the lesser density float and the other item which is more density sink if the density of any item is more than the density of water it will always think and if the density of any substances less than the density of water it will float
What are the two types of chemical exposure?
skin contact, ingestion, and inhalation.Breathing and inhaling into to the lungs is known as inhalation.To ingest anything orally is to ingest it.When anything comes into close proximity to the skin, skin contact occurs.
Which two categories of chemical dangers are most common?The dangers associated with employing chemicals are referred to as chemical hazards.There are two categories of chemical dangers at work:Hazards to physical and chemical systems
What are hazardous compounds and chemical hazards?Chemical and toxic compounds can cause a variety of physical and health risks, including irritability, sensitization, and carcinogenicity .
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a student trying to prepare aspirin begins with 2.52 g of salicylic acid and excess acetic anhydride. what is the students theoretical yield of aspirin? show your work g
The theoretical yield of aspirin that a student can prepare from 2.52 g of salicylic acid and excess acetic anhydride is 3.28 g.
The theoretical yield of aspirin that a student can prepare from 2.52 g of salicylic acid and excess acetic anhydride can be calculated using the following steps:
Calculate the moles of salicylic acid (SA):
Moles of SA = 2.52 g/138.12 g/mol = 0.01826 mol
Calculate the moles of acetic anhydride (AA):
Moles of AA = 0.01826 mol/1 mol = 0.01826 mol
Calculate the theoretical yield of aspirin (ASA):
Moles of ASA = 0.01826 mol x 1 mol/1 mol = 0.01826 mol
Convert the moles of ASA to grams:
Grams of ASA = 0.01826 mol x 180.15 g/mol = 3.28 g
Therefore, the theoretical yield of aspirin that a student can prepare from 2.52 g of salicylic acid and excess acetic anhydride is 3.28 g.
If the student obtains 1.71 g of aspirin, then the percent yield can be calculated using the following equation:
Percent Yield = (Actual yield/Theoretical yield) x 100
Percent Yield = (1.71 g/3.28 g) x 100 = 52.2%
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Complete question is attached below.
What is modern symbols of elements?
Name of the element is represented by a symbol. One atom of the element is depicted by the symbol. Some symbols, like those for gold, copper, and potassium, are taken from the latin names of the elements.
What do the elements' contemporary emblems look like?Zinc, Zn, chlorine, etc. Other symbols were derived from Latin, Germanic, or Greek names of elements. For instance, the Latin term for iron is ferrum, while the symbols for sodium and potassium are natrium and kalium, respectively.
How do the modern's components fare?The elements are listed in the current periodic table according to their atomic number, not their relative atomic mass. The elements are grouped in rows, sometimes known as periods, in the periodic table.
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Give examples of environmental concerns I will be taking into account by a mining company when it created a reclamation plan for a mine site
Answer:
The major potential environmental impacts associated with mining and associated mineral processing operations are related to erosion-prone landscapes, soil and water quality, and air quality.
Explanation:
Plants were native to the mining site and making sure the soil is healthy are the examples of environmental concerns taking into account by a mining company when it created a reclamation plan for a mine site.
What are environmental concerns?Land use may change as a result of mine exploration, construction, operation, and maintenance.
It may also have detrimental effects on the environment, such as deforestation, erosion, contamination of nearby streams and wetlands, alteration of soil profiles, increased noise levels, and dust.
Mining is a naturally invasive operation that can alter the landscape over a much wider region than the actual mining site.
Therefore, years after a mine closes, the impacts of this harm can still be felt, adding to greenhouse gas emissions, causing flora and fauna to die, and eroding the land and environment.
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[URGENT!] - Acids and Bases
a) What is the pH of a solution in which 25.0 ml of a 0.400 M solution of HCl is added to 75.0 ml of a 0.500 M solution of ammonium hydroxide?
b) If 0.050 moles of KOH were added to the buffer solution, what would be the resulting pH?
c) Explain what chemical reaction(s) happen as KOH is added to the buffer solution.
Answer:
b) answer. NaOH is a strong base, meaning it will dissociate basically completely in solution to form
N
a
+
and
O
H
−
ions in solution.
One mole of
O
H
−
ions is created for every mole of NaOH that is dissolved. If it's a .05 M solution of NaOH, then it can also be interpreted to be a .05M solution of
OH−.pOH
(The pH scale for bases) can be found by taking the negative logarithm of OH− concentration.
pOH = −log
[05M] = 1.3.
However, we are trying to find
pH
, so we must use the formula pOH+pH
=14 .Now that we know pOH
=1.3pH=14−1.3=12.7
.
How can you prevent food storage areas from cross contamination from bacteria and other hazards?
What is cross contamination?
The physical transfer of dangerous microorganisms from one person, object, or location to another is known as cross-contamination. One of the most important steps in preventing foodborne illness is preventing cross-contamination.
Cover all raw ingredients, especially meat, and keep them apart from prepared foods.Use a dish with a lid if you want to avoid spills.Keep raw meat, poultry, fish, and shellfish covered in your refrigerator's bottom shelf.For raw and cooked food, use various utensils, plates, and cutting boards.To learn more about cross contamination from the given link.
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What are the 3 types of chemical formula?
which statements is true about electrons in their energy levels?
a. electrons closer to the nucleus require more energy to remove.
b. elements with greater atomic mass require more ionization energy.
c. elements with small atomic radii easily gain electrons.
d. electrons are lost from the inner energy levels first.
Answer:
statements a and c are correct
Help pls I have this 100 question test and do not get this question pls helppp !!!
Answer:
The answer to your problem is B
an element X forms an oxide with formula X2O3
(a) state the valency of X
(b) write the formula of
The number of atoms of X in its oxide is 2 and that of oxygen is 3. The number of oxygen atoms in the oxide be the valency of the element X. Hence, the valency of the element X is 3.
What is valency?Valency of an atom is the number of electrons that have to be gained or lost from the atom to achieve octet. It is based on the number of valence electrons of the element.
If an element has 6 valence electrons, then it needs 2 more electrons to achieve octet hence, the valency is 2. Oxygen has a valency of 2 thus, it needs two electrons to be donated or shared by other atom.
The number oxygen in the oxide is the number of electrons required by the element X to achieve octet. Therefore, the valency of X is 3.
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in an ionic or covalent substance, electrons are shared or transferred between no more than two atoms at a time. however, in a metallic substance, electrons are shared among all of the metal atoms in the sample. how does this explain why metals are more malleable and ductile than ionic and covalent compounds?
Metals are known to be more malleable and ductile than ionic and covalent compounds because the electrons in metals are shared among all of the metal atoms in the sample, forming an electrons "sea" surrounding the metal ions.
A "sea" of shared electrons surrounds the metal ions in a metallic composition composed of all metal atoms. This electron sea is assumed to be responsible for several of metals' distinctive features, including strong conductivity, malleability, and ductility.
Because of the electron sea in a metallic body, metal ions can readily pass by one another and twist the metal without breaking it. The strong chemical connections that hold ionic and covalent compounds together, on the other hand, make it more difficult to change them without rupturing the bonds. Ionic and covalent compounds are less ductile and malleable than metals because of this.
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Which sample of argon gas has the same number of atoms as a 100 ml gas at 1. 0 atm and 300k.
The sample of argon gas that has the same number of atoms as a 100 mL helium gas at 1.0 atm and 300 is 100. mL at 1.0 atm and 300. The correct option is D.
How many moles of gases are there in the samples that are provided?The ideal gas equation is used to determine the number of moles of gases in each of the provided gas samples.
The ideal gas equation is: PV/RT = n
where;
P is pressure, V is volume, n is number of moles of gas, T is temperature of gas, R is molar gas constant = 0.082 atm.L/mol/K
Moles of gas in the given helium gas sample:
P = 1.0 atm, V = 100 mL or 0.1 L, T = 300 K
n = PV/RT
n = (1 x 0.1 )/ (0.082 x 300)
n = 0.00406 moles
1 moles = 6.02x 10 ²³ number of atoms
For the argon gas sample:
A.
n = PV/RT
n = (1 x 0.05) / (0.082 x 300)
n = 0.00203 moles
B.
n = PV/RT
n = (0.5 x 0.05) / (0.082 x 300)
n = 0.00102 moles
C.
n = PV/RT
n = (0.5 x 0.1) / (0.082 x 300)
n = 0.00203 moles
D.
n = PV/RT
n = (1 x 0.1) / (0.082 x 300)
n = 0.00406 moles
Therefore, the sample of argon gas that has the same number of atoms as a 100 mL helium gas at 1.0 atm and 300 is 100. mL at 1.0 atm and 300. The correct option is D.
Your question is incomplete but most probably your full question was
Which sample of argon gas has the same number of atoms as a 100.-milliliter sample of helium gas at 1.0 atm and 300. K?
A) 50. mL at 1.0 atm and 300. K
B) 50. mL at 0.5 atm and 300. K
C) 100. mL at 0.5 atm and 300. K
D) 100. mL at 1.0 atm and 300. K
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complete the calvin cycle by filling in the missing molecules.
The Calvin cycle by filling in the missing molecules Ribulose 1,5-bisphosphate (5C) (RuBP)
The Calvin cycle, also known as the light-independent reactions, bio synthetic phase, dark reactions, or photosynthetic carbon reduction (PCR) cycle[1] of photosynthesis, is a sequence of chemical processes that transform carbon dioxide and hydrogen-carrier molecules into glucose. In all photosynthetic eukaryotes as well as many photosynthetic bacteria, the Calvin cycle is present. The stroma, the area of a chloroplast that is fluid-filled and not covered by thylakoid membranes, is where these reactions take place in plants. These reactions take the byproducts of light-dependent reactions (ATP and NADPH), and put them through additional chemical pathways. To create sugars that the plant can utilise, the Calvin cycle combines the reducing power of NADPH and the chemical energy of ATP. These substrates are utilised in a sequence of reduction-oxidation processes that result in the production of sugars.
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Which of the following represent the solubility of sugar in water at 20 degree Celsius 21 g 204 g 37 g 164 g?
The solubility of sugar in water at 20 degree Celsius is approximately 180 g/L.
What is solubility?Solubility is the ability of a substance to dissolve in a liquid or other solvent. This is an important property of chemical compounds because it affects the availability of a substance in various forms, such as in a solution, suspension, or solid. For example, sugar is more soluble in hot water than in cold water, meaning that more sugar can dissolve in hot water than in cold water. Solubility can be affected by the temperature, pressure, and the chemical and physical properties of the substances involved. In general, solubility increases as temperature increases, and decreases as pressure increases. Additionally, solubility may be affected by the pH of the solution or the presence of other compounds.
Therefore:
21 g: Soluble - 21 g of sugar is soluble in water at this temperature.
204 g: Insoluble - 204 g of sugar is more than the solubility limit at this temperature, so it is insoluble.
37 g: Soluble - 37 g of sugar is soluble in water at this temperature.
164 g: Insoluble - 164 g of sugar is more than the solubility limit at this temperature, so it is insoluble.
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How do you tell if pewter has lead in it?
The best approach to determine whether a piece of pewter contains lead is to use a lead test kit from the hardware store. Here, a section of metal is swabbed with test chemicals to see if the color changes. Lead is typically indicated by pink or red kits.
Lead content in antique pewter?30 percent lead and 70 percent tin were the main components of ancient pewter. When exposed to acidic foods, this type of pewter, often known as black metal, quickly leached away its lead.
What caused the removal of lead from pewter?It's vital to remember that early pewter contained a lot of lead. Due to lead's hazardous nature, everyday or frequent use caused the chemical to leak out of the plate and spoon.
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which statement about the most stable lewis structures of cyanamide (h2ncn) and its structural isomer (hncnh) is not correct?
The most stable Lewis structures of cyanamide (H2NCN) and its structural isomer (HNCNH) are not correct.
This is because the two molecules have different molecular structures, which means they have different electron configurations and therefore different Lewis structures.
The Lewis structure of cyanamide (H2NCN) is characterized by two double bonds, one between the nitrogen and carbon atoms, and the other between the nitrogen and hydrogen atoms. This structure is highly stable and is due to the fact that the nitrogen atom has a full octet of electrons.
The Lewis structure of the structural isomer (HNCNH) is characterized by a single bond between the nitrogen and hydrogen atoms, and a triple bond between the nitrogen and carbon atoms. This structure is less stable than the cyanamide Lewis structure because it does not have a full octet of electrons.
In conclusion, the statement that the most stable Lewis structures of cyanamide (H2NCN) and its structural isomer (HNCNH) are not correct is false. The two molecules have different molecular structures and different Lewis structures, with cyanamide having a more stable structure.
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What will be the freezing point depression of 0.4 m NaCl solution and 0.4 m glucose solution?
Freezing point depression of 0.4 m NaCl solution is twice that of of 0.4 m glucose solution.
What is freezing point?
When the temperature of a liquid falls below its freezing point, it transforms into a solid. According to the internationally accepted definition, freezing is the solidification phase change of a liquid or the liquid content of a substance caused by cooling.
Most substances have the same melting and freezing points; however, certain substances have different solid-liquid transition temperatures. Agar, for example, exhibits hysteresis in its melting and freezing points. It melts at 85 °C (185 °F) and solidifies at 32 °C to 40 °C (89.6 °F to 104 °F).
0.4M NaCl solution has nearly twice the freezing point depression T f as 0.4M glucose solution.
T f = I K f m
Here, m is the molality of solution, which is approximately equal to the molarity M of solution, and vant Hoff factor is mM I
i=1 for non-electrolyte glucose because it does not dissociate. i=2 for the electrolyte NaCl because one molecule of NaCl dissociates to give two ions.
Because T f I for any given value of m, the freezing point depression (T f ) of 0.4M NaCl solution is nearly twice that of 0.4M glucose solution
Hence, freezing point depression of 0.4 m NaCl solution is twice that of of 0.4 m glucose solution.
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What causes solid to change to a liquid?
Answer:
heat
Explanation:
it causes the atoms to move faster and the bonds between them become looser, and the solid changes to a liquid.
The equation for the reaction is
CaCO3(s) →
Calculate the maximum mass of calcium oxide that can be obtained by heating 25 tonnes of calcium carbonate. (Relative atomic masses: c=12, o=16, ca=40
The maximum mass of calcium oxide that can be obtained from by heating 25 tonnes of calcium carbonate is 12700590 g
How do I determine the maximum mass of calcium oxide?We'll begin by converting 25 tons to grams. Details below:
1 ton = 907185 g
Therefore,
25 tons = 25 × 907185
25 tons = 22679625 g
Finally, we shall determine the maximum mass of calcium oxide, CaO produced from the reaction. This is shown below
CaCO₃ -> CaO + CO₂
Molar mass of CaCO₃ = 100 g/molMass of CaCO₃ from the balanced equation = 1 × 100 = 100 g Molar mass of CaO = 56 g/molMass of CaO from the balanced equation = 1 × 56 = 56 gFrom the balanced equation above,
100 g of CaCO₃ reacted to produce 56 g of CaO
Therefore,
22679625 g of CaCO₃ will react to produce = (22679625 × 56) / 100 = 12700590 g of CaO
Thus, the maximum mass of calcium oxide, CaO obtained is 12700590 g
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consider the following tetra-substituted cyclohexane:
A colorless, movable liquid with a light, sweet smell is cyclohexane. In addition to being somewhat soluble in alcohol, acetone, benzene, ethanol, ethyl ether, olive oil, and carbon tetrachloride, it is also somewhat soluble in water.
Six groups are present in the equatorial regions and another six groups are present in the axial groups, making the chair conformation structure the most stable conformation structure.
As seen in figure 1 The chair conformation will be stable when the bigger atoms or groups are at the equatorial position. This is because there is relatively little steric interaction between the atoms or groups. The bigger atoms or groups that are present at the equatorial position do not interact sterically.
The chair conformation structure in figure 2 is the stable conformation structure. Because the adjacent groups to the bulky groups are present in the axial location and the equatorial position of the bulky groups, the groups do not interact with one another.
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What is the hydrogen ion concentration for a solution of ammonia, whose hydroxide ion concentration is 6.25×10−8 mol/L?
The hydrogen ion concentration of a solution of ammonia depends on the concentration of the hydroxide ions in the solution.
The hydrogen ion concentration of a solution of ammonia with a hydroxide ion concentration of 6.25 x 10-8 mol/L can be calculated using the equation Kw = [H+] [OH-], where Kw is the ion product constant for water. Using this equation, [H+] can be calculated by rearranging to [H+] = Kw/[OH-] and substituting the given values. This gives [H+] = 1.0 x 10-14/6.25 x 10-8, which equals 1.6 x 10-7 mol/L. Therefore, the hydrogen ion concentration for the given solution of ammonia is 1.6 x 10-7 mol/L.
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When exposed to a chemical What should you do?
If you believe you may have inhaled a chemical, get outside right away.If a liquid chemical saturates skin or clothing, immediately remove clothing and thoroughly wash the affected area to remove the chemical.
What should you do initially if you are exposed to the a chemical?Get medical help right away.If this substance comes in touch with your skin, immediately wash it off with water.If this chemical gets on your clothing, take it off right away, and immediately wash your skin with water.After cleaning, seek medical assistance if the irritation continues.
How you'd do if chemical dangers put you in danger?Reduce contact with chemicals by donning gloves, a mask, or other safety gear.After utilising chemicals, always wash your hands using soap and warm water.
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What is the mass of 1.00 mol of each substance?
The mass of one mole of a substance is equal to that substance's molecular weight.
The molecular weight of a substance is equal to its mass in one mole. Water, for example, has a mean molecular weight of 18.015 atomic mass units (amu), implying that one mole of water weighs 18.015 grams. In the International System of Units, the mole (symbol mol) is the unit of substance amount (SI). The amount of substance is a measurement of how many elementary entities of a given substance are present in an object or sample. An elementary entity can be an atom, a molecule, an ion, an ion pair, or a subatomic particle such as an electron, depending on the substance.
The mole is widely used in chemistry to express quantities of reactants and products of chemical reactions. The term gram-molecule was formerly used for "mole of molecules", and gram-atom for "mole of atoms".
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Draw the major organic product of the reaction shown below. он +HBr You do not have to consider stereochemistry. You do not have to explicitly draw H atoms. opy aste ChemDoodle
The major organic product of the reaction shown below. он +HBr You do not have to consider stereochemistry. The product is Ether i.e. CH3−CH2−O−CH2−CH3.
Stereochemistry is a branch of chemistry that studies and manipulates the relative spatial arrangement of atoms within molecules. The study of interactions between stereoisomers, which have various structural formulas but the same chemical formula and arrangement of linked atoms (constitution) by definition, is known as stereochemistry (the three-dimensional orientations of their atoms in space). Due to the fact that the prefix "stereo-" signifies three-dimensionality, it is also known as 3D chemistry. Stereochemistry encompasses all of chemistry, including organic, inorganic, biological, physical, and especially supramolecular chemistry. Stereochemistry include techniques for identifying and defining these relationships, the effects these relationships have on the chemical or biological characteristics of the molecules in question, and how these relationships affect the reactivity of the molecules in question (dynamic stereochemistry). One important field of stereochemistry is the study of chiral compounds, or molecules lacking a plane of symmetry and not superposable on their mirror copies. The word "chiral," which is derived from the Greek word "cheir," which also denotes handedness, describes objects that have a "left-handed" and "right-handed" shape.
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electron configuration of mg2+
Answer:
The electron configuration of magnesium (Mg) in its neutral state is 1s2 2s2 2p6 3s2. When magnesium loses two electrons to form a magnesium ion with a 2+ charge (Mg2+), its electron configuration becomes 1s2 2s2. This means that the 3s2 subshell is now empty, and the magnesium ion has a full outer shell with a total of two electrons. The electron configuration of Mg2+ can also be written as [Ne] 3s2.
HOPE IT HELPSwhich balloon, a or b, most accurately illustrates the effusion of a gas from the central balloon?
Balloon A indicates accurately illustrates the effusion of a gas from the central balloon.
The root mean square velocity of orange molecules is greater. As a result, they travel faster than blue molecules. They are more easily able to escape from balloons than blue ones. As a result, balloon A (with less orange and more blue) indicates proper effusion.
The root means square velocity v is given by the formula v = (3RT/M)1/2,
So,
v is proportional to (1/M)^1/2
The effusion rate is proportional to ( 1/M)^1/2
As a result, the rate of effusion is proportional to v. ( room means square velocity)
Relative rate of effusion for orange spheres compared to blue spheres
= (v of orange / v of blue)
= (495 m/s / 380 m/s)
= 1.303
As an outcome, the relative rate of effusion is 1.303. (orange is 1.303 times more effused than blue).
As a result, they travel at a faster rate than blue molecules. They are more easily able to escape from balloons than blue ones.
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