Answer:
There are several methods that can be used to prevent or slow corrosion:
Coatings: Applying a protective coating to a metal surface can prevent corrosion by creating a barrier between the metal and the environment. Common types of coatings include paint, galvanizing, and electroplating.
Cathodic protection: Cathodic protection involves applying a current to a metal surface in order to reduce the potential difference between the metal and its environment. This can help to prevent corrosion by reducing the electron flow that drives the corrosion reaction.
Inhibitors: Corrosion inhibitors are chemical substances that can be applied to a metal surface to slow or prevent corrosion. These substances work by reacting with the metal surface or the environment to form a protective film or layer.
Passivation: Passivation is a process that involves removing surface contaminants and oxide layers from a metal surface in order to improve its corrosion resistance. This can be achieved through chemical or mechanical means.
Materials selection: Choosing corrosion-resistant materials for specific applications can help to prevent or slow corrosion. For example, stainless steel is a commonly used material for corrosive environments because of its high resistance to corrosion.
Environmental control: Controlling the environment in which a metal object is used can also help to prevent or slow corrosion. For example, reducing humidity or keeping a metal object dry can help to prevent corrosion.
Maintenance: Regular maintenance, such as cleaning and inspection, can help to identify and address corrosion issues before they become severe. This can include removing corrosion products, repairing damage, and applying protective coatings as needed.
What reagent causes the observed visual change in a positive Lucas test?
The observed visual change from a clear and colourless characteristic to a turbid, cloudy, and hazy characteristic, in a positive Lucas test, is caused by the Lucas reagent.
The Lucas Test is used to detect the presence of a primary alcohol.
When the test is positive, the mixture of the primary alcohol with the Lucas reagent changes from a clear and colourless characteristic to a turbid, cloudy, and hazy characteristic. This visual change is due to the reaction of the primary alcohol with the Lucas reagent which is a mixture of concentrated hydrochloric acid and zinc chloride.
The Lucas Test is used to detect the presence of a primary alcohol, and when a positive result is obtained, the reaction of the primary alcohol with the Lucas reagent, a mixture of hydrochloric acid and zinc chloride, causes the visual change from a clear and colourless characteristic to a turbid, cloudy, and hazy one.
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How do you calculate number of molecules?
Determine the substance's molecular weight in units of one mole, then divide the molar mass value by the molecular mass, and multiply the result by the Avogadro constant to get the required number of molecules.
It is possible to determine the number of molecules by using the relationship between the number of moles and Avogadro's number, which is provided by;
1 mole = Avogadro's constant (NA)
The number of molecules will equal the product of the number of moles and Avogadro's number, which is determined after the number of moles has been determined
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How many moles of hydrogen (H2) are required to completely reduce 1 mole of cis-2,3,3- trimethylhepta-1,5-diene
2 moles of hydrogen (H2) are required to completely reduce 1 mole of cis-2,3,3- trimethylhepta-1,5-diene (C11H16).
What is moles?Moles, in chemistry, is a unit of measurement used to express the amount of a substance. It is equal to 6.022 x 1023 atoms, molecules, ions, or other particles. In other words, a mole contains an exact number of particles, which is known as Avogadro's number. The mole is a convenient way to measure and compare large amounts of a substance. It is also used to measure the amount of energy released or absorbed in a chemical reaction.
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If the actual yielsd of a reaction is 50 g and the theoretical yield is 60 g. What is the percent yield.
If the actual yield and percent yield are 51.4g and 77.0%, respectively, calculate the theoretical yield. We predicted a theoretical yield of 13 grams for the reaction of Na with Cl2.
Yield is determined by dividing the principal amount by the net realized return. Gains and returns on stock investments, for instance, can take one of two kinds. On the basis of the chemical equation's stoichiometry, theoretical yield is computed. Experimental data are used to determine the real yield. Calculating the ratio of actual yield to theoretical yield yields the percent yield. The % ratio of the theoretical yield to the actual yield is known as the percent yield. It is calculated as the theoretical yield multiplied by 100% divided by the experimental yield.
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Is meter stick used in sewing?
Measuring fabric is one purpose for this wooden metric and meter stick that is perfect for many different applications.
Often employed in the construction business, a meterstick, metrestick, as well as yardstick refers to a straightedge or even a foldable ruler was using to measure length. They were frequently built of plastic or wood, with metal as well as plastic joints which enable folding.
A sewing or seam gauge would be a compact but helpful instrument for gauging tiny distances. The spaces needed for buttonholes as well as buttonhole spacing can also be measured using the sewing gauge, along with hemlines, tucks, as well as pleats.
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How many moles of MgCO3 are present in 252. 939 grams of MgCO37
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The number of moles of MgCO3 that is present in the given mass of magnesium carbonate is 2.99 moles.
The number of moles can be defined as the ratio of given mass over molar mass. The chemical that is given is magnesium carbonate having molar mass of 84.314 g/mol and the given mass of the same is 252.939 grams.
The formula for number of moles that is 'n' can be given as follows:
n= m/M where m is the given mass and M is the molar mass.
Substituting the values,
n= 252.939 grams /84.314 grams/mol
n=2.99 moles
Therefore, the number of moles of MgCO3 is 2.99 moles.
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Coca-Cola is making a version of Coke that uses sucrose (C12H22O11) instead of high fructose corn syrup. If there are 39.24 grams of sucrose in a 12.0 fluid oz. can of this Coke, what is the molarity of sucrose in the Coke
Coca-Cola is making a version of Coke that uses sucrose (C12H22O11) instead of high fructose corn syrup. The molarity of sucrose in the Coke is 0.32 mol/L.
Coca-Cola is making a version of Coke that uses sucrose (C12H22O11) instead of high fructose corn syrup. If there are 39.24 grams of sucrose in a 12.0 fluid oz. can of this Coke, what is the molarity of sucrose in the Coke.
To find the molarity of sucrose in the Coke, we first need to find the number of moles of sucrose present in the can. We can use the mass of sucrose (39.24 g) and the molar mass of sucrose (342.3 g/mol) to find the number of moles of sucrose:
= (39.24 g) / (342.3 g/mol)
= 0.114 mol
Next, we need to find the volume of the can in liters. We can convert the volume in fluid oz. to liters using the conversion factor 1 fluid oz.
= 0.0295735 L:
= (12.0 fluid oz.) x (0.0295735 L/fluid oz.)
= 0.354882 L
Finally, we can use the formula for molarity (moles of solute / liters of solution) to find the molarity of sucrose in the Coke:
= molarity
= (0.114 mol) / (0.354882 L)
= 0.32 mol/L
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A(n) ____________________ has more hydrogen ions than hydroxide ions and has a pH ____________________ 7.
An acidic solution has a pH over 7 and contains more hydrogen ions than hydroxide ions. Any aqueous solution with a pH lower than 7.0 ([H+] more than 1.0 x 10-7M) is said to be acidic.
A acidic solution that uses water as its solvent is said to be aqueous. Acidic solutions are sour in contrast to alkaline solutions, yet it's never a good idea to taste an unidentified solution. Any solution that contains more hydrogen ions per volume of solution than water is an acidic solution; contrasted with acidic solutions are basic or alkaline solutions. Atomic number 1 and the letter H stand for the chemical element hydrogen. The element hydrogen is the lightest.
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Which one of the following statements is not correct about MSDS?
Select one:
a.
It does not contain information on physical and chemical properties of the material, potential hazards of the material and how to work safely with these materials.
b.
It provides single reference for all information about hazardous chemicals.
c.
Material Safety Data sheet forms the important elements of effective Chemical Hazards Communication System.
d.
It is a document prepared by the manufacturers/suppliers of the chemical
Option B. It provides a single reference for all information about hazardous chemicals.
MSDS does not provide a single reference for all information about hazardous chemicals, but it does provide information on physical and chemical properties, potential hazards, and safe work practices.
Understanding the Role of MSDS in Chemical Hazard CommunicationThe Material Safety Data Sheet (MSDS) is a document prepared by the manufacturer or supplier of a hazardous chemical which provides information about the physical and chemical properties of the hazardous chemical, potential hazards associated with it, and how to work safely with it. The MSDS is an important element of an effective chemical hazard communication system as it provides information on how to identify and protect against potential health hazards, proper storage and handling procedures, and proper disposal methods.
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What process makes 2 ATP?
Anaerobic respiration results in the production of 2 ATP molecules.
What is anaerobic respiration?Anaerobic respiration is the use of electron acceptors other than molecular oxygen in respiration. Despite the fact that oxygen is not the ultimate electron acceptor, the process employs a respiratory electron transport chain. When there is insufficient oxygen for some species to respire, they still require energy to survive. Due to a lack of oxygen, they respire in the absence of oxygen to create the energy they require, which is known as anaerobic respiration. While most aerobic respiration (with oxygen) occurs in the cell's mitochondria, anaerobic respiration (without oxygen) occurs in the cytoplasm.
Here,
Two ATP molecules are created during anaerobic respiration.
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Which supports the idea that conservation of mass is a scientific law instead of a hypothesis?
A- It is an educated guess.
B- It has been tested and supported once or twice.
C- It has been examined, tested and supported over centuries.
D- It has been tested many times and sometimes is true and sometimes isn’t.
Answer:
C- It has been examined, tested and supported over centuries.
Explanation:
The conservation of mass is a scientific law that states that matter cannot be created or destroyed, only transformed from one form to another. This law has been extensively tested and supported over centuries of scientific investigation, and it is considered to be a fundamental principle of chemistry and physics.
How many mole is 1g?
One gram of a chemical is equivalent to one mole.
A physical characteristic called the molar mass is calculated by dividing the mass of a given substance by the substance's volume. The standard relative atomic mass of an element is multiplied by the molar mass constant, 1 × 10⁻³ kg/mol = 1 g/mol, to determine the molar mass of its atoms. A compound's molar mass is calculated by adding the standard atomic weights of the constituent atoms and multiplying the result by the molar mass constant.
One atom or molecule has the same mass in grams as one mole of a substance does in atomic mass units.
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A magnesium ion, Mg2+, with a charge of 3. 2×10−19C and an oxide ion, O2−, with a charge of −3. 2×10−19C, are separated by a distance of 0. 25 nm. How much work would be required to increase the separation of the two ions to an infinite distance?
The amount of work required to increase the separation of the two ions to an infinite distance is 3.68×10⁻¹⁸joules.
What is work and energy ?When a push or pull applied to an object causes the object to move, that movement is referred to as work. We refer to energy as the ability to perform the work. The work completed in a given amount of time is referred to as power.
Mg²⁺with a charge is 3.2×10⁻¹⁹C
O²⁻with a charge of −3.2×10⁻¹⁹C
distance = 0.25 = 0.25 ×10⁻⁹m
We know that the constant of proportionality is equal to 8.99×10⁹Jm/C²
Work = -kq₁q₂/d
Substitute given values into the formula,
Work = 8.99×10⁹× 3.2×10⁻¹⁹× -3.2×10⁻¹⁹/ 0.25 ×10⁻⁹
Work = 8.99×10⁹×-1.024×10⁻³⁷/0.25×10⁻⁹
Work = 9.21×10⁻²⁸/ 0.25×10⁻⁹
Work = 3.68×10⁻¹⁸Joules.
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An ice cube with a volume of 45. 0ml and a density of 0. 9000g/cm3 floats in a liquid with a density of 1. 36g/ml. What volume of the cube is submerged in the liquid
The volume of the cube that is submerged in the liquid would be 36.0 ml.
What is submerged?Submerged refers to something that is completely covered or surrounded by a liquid, usually water. Submerged objects are often completely or partially underwater, and can refer to anything from a submerged shipwreck to a submerged rock formation. Submerged objects can also refer to objects that are partially or totally surrounded by the water or liquid, such as a submerged tree or submerged vegetation. Submerging can also refer to objects that are pushed underwater or forced down due to pressure, such as a submarine. Submerging can also refer to a process in which an object is submerged and then brought back up, such as in underwater welding or archaeological excavations.
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Select True or False: The rates of radioactive decay processes, like the rates of chemical reactions, are sensitive to temperature changes.
Answer: False
Explanation:
Consider the reaction.
NH4HS(s)⇌NH3(g)+H2S(g)
At a certain temperature, Kc=8.5×10−3. In a reaction mixture at this temperature containing solid NH4HS, [NH3]=0.166 M and [H2S]=0.166 M. Will more of the solid form or will some of the existing solid decompose as equilibrium is reached?
In the reaction, NH4HS(s)⇌NH3(g)+H2S(g), more of the solid will form.
What is equilibrium?In a chemical reaction, equilibrium is the state where both the reactants and products are present in concentrations which have no further tendency to change with time, so there is also no observable change in the properties of the system. This state results when forward reaction proceeds at the same rate as reverse reaction.
If Q= K then equilibrium
Q>k, then reversed direction shift
Q<k, then forward direction shift
Given, Kc=8.5×10−3
Given [NH3]=0.166 and M [H2S]=0.166 M
Here Q= 0.166 M (given)
It shows Q> k that is 0.166 > 8.5×10−3
Therefore, more of the solid will form.
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if you start with 5.5 grams of sodium fluoride how many grams of magnesium fluoride will be produced
From 5.5 grammes of sodium fluoride, 4.1 grammes of magnesium fluoride will be created. The inorganic substance MgF2 stands for magnesium fluoride.
It naturally occurs as the rare mineral sellaite and is a white crystalline salt that is transparent over a broad range of wavelengths and has commercial use in optics used in space telescopes. With the formula NaF, sodium fluoride (NaF) is an inorganic substance. It is utilised in minute quantities in toothpaste, metallurgy, and as a flux in addition to fluoridating drinking water. It is a white or colourless substance that easily dissolves in water. Pharmaceutical manufacturers frequently use it as a source of fluoride. Mass in grammes is equal to 0.06548 times 62.301 grammes of MgF2.
= 0.06548 /62.301 = 4.1grams
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Why are all the elements in group 18 relatively unreactive meaning they do not gain lose or share electrons with other atoms?
Elements of group 18 belongs to the family of noble gases with a general electronic configuration ns²np⁶, where the valence shell is completely filled.
The elements of group 18 are considered to be noble because they have a completely filled valence shell due to which they donot have the tendency to gain, lose or share their valence electrons with other atoms. Thus, they are highly unreactive.
The elements belonging to noble gas family are: Helium (He), Neon (Ne), Argon(Ar), Krypton(Kr), Xenon(Xe), Radon(Rn).
under conditions of standard pressure and temperature, these elements exists as gases with very low chemical reactivity so they are known as inert gases.
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Write a balanced net ionic equation for a neutralization reaction that results in the formation of sodium fluoride.
Balanced net ionic equation for a neutralization reaction that results in the formation of sodium fluoride is Na+ + F- → NaF
What is neutralization reaction?A neutralization reaction is a chemical reaction that occurs when an acid and a base react to form a salt and water. This type of reaction is exothermic, meaning that it releases energy in the form of heat. During a neutralization reaction, hydrogen ions from the acid are neutralized by the hydroxide ions from the base. The byproduct of this reaction is a salt and water. The salt produced depends on the acid and base used in the reaction, and the pH of the solution is neutralized to 7.0.
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Mg + _________HCI →
_____ H₂ + _____ MgCh
Mg + 2HCl → H2 + MgCl2 because The reaction between magnesium and hydrochloric acid produces hydrogen gas and magnesium chloride.
What is molecule?Molecules are the smallest unit of a chemical compound that can exist independently and remain unchanged in chemical composition. A molecule is composed of two or more atoms that are chemically bonded together. A molecule can be made up of different elements, such as carbon, hydrogen, oxygen, and nitrogen, and can be composed of a variety of combinations of these elements. Molecules are essential components of all living things, as they are important for basic functions such as energy transfer, metabolism, and cell structure.
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If there are 6 atoms of hydrogen on the products side, how many molecules of H2 are on the reactants side?
If there are 6 atoms of hydrogen on the products side, then there would be 6 atoms of hydrogen also on the reactants side. That would be 3 molecules of [tex]H_2[/tex].
Law of conservation of atomsAccording to the law of conservation of atoms or matter, atoms can neither be destroyed nor created during the course of chemical reactions. However, atoms can change forms during reactions.
Going by this law, it means the number of atoms of a particular element must remain constant before and after chemical reactions. Otherwise, we will say the chemical equation of such reactions are not balanced.
Thus, if there are 6 atoms of hydrogen on the products side of a reaction, 6 atoms of hydrogen must also be on the reactants side of the reaction. A molecule of hydrogen, [tex]H_2[/tex], has 2 atoms of hydrogen. This means 3 molecules of hydrogen must be on the reactants side in order to have a total of 6 hydrogen atoms.
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Write a introduction base on the topic reproduction, male an female reproduction system
The ma le repr0 ductive system includes made up of internal organs such as the prostate gland, vas deferens, as well as ure thra as well as external geni talia like the pe nis, tes tes, as well as scrot um.
The health of something like the male reproductive system and the hormo nes secreted by the brain determine a man's fertility as well as sexual characteristics.
The human reproductive system would be the organ system primarily charged of creating and fertilizing gametes (eggs but rather sperm) as well as carrying a fetus. The gonads of both se xes create gametes.
The ov aries, fallopian tubes, uterus, cervix, as well as vagina are all parts of the female repro ductive system. It comprises the pe nis, prostate, as well as tes tes in men.
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Which of these is not a property of the intracellular fluid (ICF)?The concentration of chloride ion is lower than that of interstitial fluid. The concentration of potassium ion exceeds that of sodium ion. The concentration of sodium ion exceeds that of potassium ion. The protein concentration is higher than that of interstitial fluid.
The protein concentration is higher than that of interstitial fluid. The intracellular fluid (ICF) is the fluid inside cells, and is composed of water, electrolytes, and organic molecules.
The intracellular fluid (ICF) is the fluid inside cells, and is composed of water, electrolytes, and organic molecules. Common properties of ICF include high concentrations of potassium ions and low concentrations of chloride ions compared to interstitial fluid. The protein concentration of ICF is lower than that of interstitial fluid.
The protein concentration is higher than that of interstitial fluid.
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Select the correct answer. which gas is the most abundant greenhouse gas?
a. ozone
b. chlorofluorocarbon
c. carbon dioxide
d. methane
e. water vapor
E) The most significant and prevalent greenhouse gas is water vapor. Ozone, carbon dioxide, methane, nitrous oxide, and other gases are also present.
Which major source of greenhouse gases is it?Over the past 150 years, almost all of the rise in atmospheric greenhouse gases has been caused by human activities. Burning fossil fuels for transportation, electricity, and heating is the primary human activity in the United States that contributes to the emission of greenhouse gases.
Which four greenhouse gases have the greatest impact?The greenhouse gases on Earth warm the planet by storing heat in the atmosphere. Carbon dioxide, methane, nitrous oxide, and water vapor—all of which are found naturally—as well as fluorinated gases—which are made—are the main gases that cause the greenhouse effect.
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How is water an exmaple of an molecule and a compound
Answer:
Water is a compound because it is made up of water molecules. There is no such thing as water atoms. Water molecules are made of hydrogen and oxygen atoms, in the definite proportion of two hydrogens for one oxygen.
Explanation:
The difference between a molecule and a compound is this:
A molecule consists of two or more atoms joined by a chemical bond.
A compound consists of two or more different atoms joined by chemical bonds.
Water (H2O) is both a molecule and a compound.
Hydrogen gas (H2) and oxygen gas (O2) are molecules but because the atoms of which they are made are not different, they do not qualify as compounds.
What volume of 0.450 M Na3PO4 is required to precipitate all the lead(II) ions from 190.0 mL of 0.600 M Pb(NO3)2
We need 0.127 L of 0.450 M Na3PO4 to precipitate all the lead(II) ions from 190.0 mL of 0.600 M Pb(NO3)2.
How to determine the amount of Na3PO4 needed?This is a precipitation reaction. To determine the amount of Na3PO4 needed to precipitate all the lead(II) ions, we need to find the number of moles of Pb(NO3)2 present in the solution.
First, we'll use the formula to convert the volume of the solution to liters:
190.0 mL * (1 L/1000 mL) = 0.19 L
Next, we'll use the molarity formula to find the number of moles of Pb(NO3)2 in the solution:
molarity (M) = moles of solute / liters of solution
moles of Pb(NO3)2 = 0.600 M * 0.19 L = 0.114 moles
Now we can use the balanced equation for the reaction to find how many moles of Na3PO4 are needed to react with all 0.114 moles of Pb(NO3)2
Pb(NO3)2 + 3Na3PO4 -> Pb3(PO4)2 + 6NaNO3
We can see that 2 moles of Pb(NO3)2 react with 3 moles of Na3PO4
So we need 0.114 moles/ 2 moles = 0.057 moles of Na3PO4
Finally we can use the molarity formula again to find the volume of 0.450 M Na3PO4 required
Molarity (M) = moles of solute / liters of solution
0.057 moles = 0.450 M * V
V = 0.057 moles / 0.450 M = 0.127 L
So we need 0.127 L of 0.450 M Na3PO4 to precipitate all the lead(II) ions from 190.0 mL of 0.600 M Pb(NO3)2
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What is the evidence for Darwin's theory of evolution?
The evidence for Darwin's theory of evolution is the consistency of the sequence of fossils from early to recent.
Changing populations and species of organisms are at the heart of biological evolution. The British naturalist Charles Darwin is most likely the first individual that comes to mind today when we discuss evolution. The biological evolution via natural selection theory was put out by British biologist Charles Darwin. Darwin believed that species change over time, give rise to new species, and descended from a single ancestor through the process of evolution. Charles Darwin's theory of evolution is known as natural selection. Animals with heritable qualities that aid in survival and reproduction will often generate more offspring than their contemporaries due to the limited resources in nature, increasing the frequency of such traits through subsequent generations.Populations change throughout time through natural selection, becoming increasingly adapted to their surroundings. Natural selection is reliant on the environment and necessitates the presence of heritable variation within a population.
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What is the measurement of expired CO2 that typically provides a numeric display of the partial pressure of CO2 in torr or mmHg
The measurement of expired CO₂ that typically provides a numeric display of the partial pressure of CO₂ in torr or mmHg is the capnometry.
The capnometry measurement of the CO₂ , carbon dioxide is the measurement in the expired air and it provides the clinician with the noninvasive measurement of systemic metabolism and the ventilation. it is used to determine the correlation in between the tidal CO₂ and the partial CO₂ in the non intubated breathless patents.
Thus, the measurement if the expired CO₂ that shows the partial pressure of the CO₂ is the capnometry.
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Why does fluorine react with xenon but iodine does not?
Fluorine reacts with xenon but iodine doesn't because fluorine is highly electronegative, it can pull electrons from xenon which is a noble gas and rarely reactive. On the other hand, iodine has low electronegativity and is least reactivity, so doesn't react with xenon.
Fluorine and iodine belongs to the family of halogens with the general electronic configuration ns²np⁵ . So, they have the tendency to attract electrons in their valence shell. Xenon, on the other hand is a noble gas with a stable electronic configuration ns²np⁶.
In family of halogens, Fluorine has the highest electronegativity and iodine has the least due to increase in its size. So, more electronegative fluorine has the tendency to form compounds with xenon whereas both iodine and xenon being less reactive cannot form a bond together.
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an empty bottle has a volume of 2.0 L at room temperature 25 C. What will the new volume be if you put it in the freezer (-4C)
An empty bottle has volume of 2 L at room temperature 25°C . If we put it in the freezer (-4°C), the new volume will be 1.8L.
According to Charles' law, " the volume of a given amount of gas held at constant pressure is directly proportional to the kelvin temperature". The equation is represented as:
V₁/T₁ = V₂/T₂
This means, with increase in temperature, volume will also increase and vice versa.
According to question,
V₁ = 2.0 L
T₁ = 25°C = (25+273)K = 298 K
T₂ = -4°C = (-4 + 273)K = 269 K
Using Charles' law equation,
V₁/T₁ = V₂/T₂
⇒V₂ = V₁×T₂ / T₁
⇒V₂ = 2L × 269 K/298K
⇒V₂ = 1.8 L
Thus, the new volume when the bottle is put in a freezer (-4°C ) is 1.8 L
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