The option that best describes the outer shell of the atoms in Group 17 on the illustration of the Periodic Table is "They have 7 electrons."Group 17, also known as the Halogens, is a group of nonmetals that have seven valence electrons. The outermost shell of these atoms contains seven electrons, making them highly reactive. These elements readily
react with metals to form salts.There are seven elements in Group 17: fluorine, chlorine, bromine, iodine, astatine, tennessine, and oganesson. All of these elements have seven valence electrons, which is why they are classified
together in the same group of the periodic table. They all have similar properties, such as high electronegativity, reactivity, and the ability to form ionic compounds. Thus, the statement that "They have 7 electrons" best describes the
outer shell of the atoms in Group 17.
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solids, liquids, and gases all have kinetic energy due to motion of their atoms or molecules. which form of molecular motion do liquids experience? select all that apply. a. translational b. vibrational c. rotational d. transitional
Translational, rotational and transitional are the form of molecular motion that liquids experience. Therefore, the correct options are option A, C and D.
The only thing that constitutes molecular motion is the movement of its component parts in a certain plane. Temperature has an impact on how much the constituent particles move. The average kinetic energy of the molecules is also measured by the temperature. Heat is another factor that affects molecular mobility since it gives molecules more kinetic energy. Molecules in a liquid are continually moving. When the container is tilted, particles travel to the left and downward due to the pull of gravity, and the gaps are filled by numerous more molecules. The result is a general outflow of liquid from the vessel. Translational, rotational and transitional are the form of molecular motion that liquids experience.
Therefore, the correct options are option A, C and D.
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if two surface water types with the same density but different salinities and temperatures mix, the resulting water will be .
If two surface water types with the same density but different salinities and temperatures mix, the resulting water will be denser than both the surface water types.
Areas under warm and high salinity surface water with an appreciable depth, the temperature and salinity decreases with depth and internal vertical mixing processes occur despite stability of the water column. Eventually, this phenomenon is caused by the ability of the sea water to lose or gain heat by conduction and loss or gain of salt takes place by diffusion. This causes the density of the moving water to change directions.
Salt water mixes over limited depths and forms homogenous layers.
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a bronsted-lowry acid is a proton _____ and must therefore contain at least one ionizable _____ atom in its formula.
The complete statement is a Bronsted-Lowry acid is a proton donor and must therefore contain at least one ionizable hydrogen atom in its formula.
According to Bronsted-Lowry theory, an acid is a substance that donates a proton (H+ ion) and a base is a substance that accepts a proton (H+ ion). In other words, an acid is a proton donor and a base is a proton acceptor.
Bronsted-Lowry acid must contain at least one ionizable hydrogen atom in its formula so that it can donate a proton to another species or substance during a chemical reaction.
This means that an acid is defined by its ability to donate a proton (H+ ion) to another substance in a chemical reaction, and this is possible only if it contains at least one ionizable hydrogen atom in its formula.
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what happens to the chloride concentration, if you add solid kcl to a solution that contains already saturated kcl?
When solid KCl is added to a solution that already contains saturated KCl, the chloride concentration will not change.
This is because the solid KCl is already in its maximum saturated concentration and cannot dissolve further. Therefore, it will not increase the chloride concentration of the solution.
When solid KCl is added to a solution that already contains saturated KCl, the solution is already saturated and the solid KCl cannot dissolve further. Therefore, adding solid KCl to the solution will not change the chloride concentration of the solution.
This is because the solid KCl is already in its maximum saturated concentration and adding more solid KCl will not further dissolve and increase the chloride concentration of the solution.
This is known as the law of maximum saturation which states that a solution can only contain the maximum concentration of the substance it can dissolve, and any additional material that is added to the solution will remain in its solid form.
Therefore, adding solid KCl to a solution that already contains saturated KCl will not affect the chloride concentration.
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Which of the following reactions take place more rapidly when the concentration of the nucleophile is increased? Check all that apply. Br CH3 + Br CH OT H. Br + CH3o +Br
The reactions that take place more rapidly when the concentration of the nucleophile is increased are:
Br- + CH3Br
CH3O- + CH3Br
Nucleophiles are electron-rich species that tend to attack electron-deficient atoms or molecules. In both reactions, the nucleophiles are Br- and CH3O-. When the concentration of the nucleophile is increased, the probability of a collision between the nucleophile and the substrate (CH3Br or CH3OTs) also increases, leading to a higher reaction rate.
In the first reaction, Br- attacks CH3Br, which is a primary alkyl halide. Primary alkyl halides are known to undergo SN2 (substitution nucleophilic bimolecular) reactions, where the nucleophile attacks the carbon atom bearing the leaving group (in this case, the bromine atom) in a concerted mechanism, resulting in inversion of the stereochemistry at the carbon center. SN2 reactions are known to be highly dependent on the concentration of the nucleophile, and increasing its concentration will increase the reaction rate.
In the second reaction, CH3O- attacks CH3OTs, which is a primary tosylate. Tosylates are also known to undergo SN2 reactions, similar to alkyl halides. Hence, the same reasoning applies here, and increasing the concentration of the nucleophile will increase the reaction rate.
In summary, both reactions that involve primary substrates (CH3Br and CH3OTs) will take place more rapidly when the concentration of the nucleophile is increased.
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how much volume in ml will you need to take from 3.8 m concentrated stock solution if you would like to prepare a diluted 0.9 solution with 100 ml? report and round your answer to a whole integer.
You will need to take 24 mL of the concentrated solution and add it to 76 mL of solvent to prepare 100 mL of a 0.9 M diluted solution.
The given data is as follows:
concentrated stock (C1)= 3.8 m
diluted solution (C2) = 0.9 m
Total available solution (V2)= 100ml
To find out the volume of the concentrated solution needed, we must use the formula
V1 x C1 = V2 x C2
By substituting the values we can get,
V1 x 3.8 M = 100 mL x 0.9 M
V1 = (100 mL x 0.9 M) / 3.8 M
V1 = 23.68 mL
Rounding to the nearest whole integer as mentioned we get:
V1 = 24 mL
Therefore, we can conclude that you will need to take 24 mL of the concentrated solution.
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according to the procedure determination of nahco3, what are two applications for mixtures of n a h c o 3 ?
Mixtures of NaHCO₃ have a variety of applications. Two common uses are as a leavening agent in baking and as an electrolyte in certain sports drinks.
What are the applications of NaHCO₃?NaHCO₃ also serves as an electrolyte in some sports drinks, which helps to replace minerals lost in sweat during exercise. The electrolyte also helps to regulate fluid balance and muscle contraction.
According to the procedure determination of NaHCO₃, two applications for mixtures of NaHCO₃ are given below: Applications of mixtures of NaHCO₃: Baking soda or NaHCO₃ is a compound that is widely used in the food industry. It is primarily used in the following ways: As a raising agent. As a component of various dry mixtures.
As a treatment for pH-related issues in food items. Acid reflux can be relieved by mixing baking soda and water. Baking soda helps to neutralize the stomach's acidic content, preventing it from causing harm. The following is an example of how to use baking soda for acid reflux: Ingredients: A glass of water A tablespoon of baking soda
Instructions: Add a tablespoon of baking soda to a glass of water.
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why is the hybridization model necessary to explain the bonding in a molecule such as ch4? select all that apply.
It helps explain why there are 4 equivalent C-H bonds in CH4,It allows for a better representation of the arrangement of electrons in the molecule, and It helps explain why the dipole moment of the molecule is zero.
What is hybridization?Hybridization is the process of combining two or more distinct entities to create a new, unique entity that has a combination of the characteristics of the original entities. It can be used to describe a wide range of phenomena, ranging from the breeding of plants and animals to the intermixing of different cultures.
In biology, hybridization is the process of combining the genetic material of two different species to create a hybrid organism.
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calculate the molar concentration of arsenic acid (h3aso4) in an unknown solution if 25.00 ml of that solution required 35.21 ml of 0.1894 m koh for neutralization.
The molar concentration of arsenic acid (H₃AsO₄) in an unknown solution is 0.1152 M.
To calculate this, we use the equation:
[H₃AsO₄] = (V₂ × C₂)/V₁
Where V₁ is the volume of the unknown solution (25.00 ml) and V₂ is the volume of KOH (35.21 ml). C₂ is the molar concentration of the KOH (0.1894 M).
By substituting the values into the equation, we get:
[H₃AsO₄] = (35.21 × 0.1894) / 25.00
[H₃AsO₄] = 0.1152 M
Therefore, the molar concentration of arsenic acid (H₃AsO₄) in the unknown solution is 0.1152 M.
To find the molar concentration of the arsenic acid (H₃AsO₄) in an unknown solution, we use the equation [H₃AsO₄] = (V₂ × C₂)/V₁.
In this equation, V₁ is the volume of the unknown solution, V₂ is the volume of KOH, and C₂ is the molar concentration of the KOH. By substituting the values, we get the molar concentration of arsenic acid (H₃AsO₄) in the unknown solution as 0.1152 M.
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you have been called to the site of an overturned railroad tank car leaking potassium hydroxide. your task is to determine the corrosivity of the spill. the best monitoring equipment for the job is a:
The best monitoring equipment for determining the corrosivity of a potassium hydroxide spill is a pH meter.
A pH meter is a device that measures the acidity or alkalinity of a solution and provides a numerical value from 0 to 14. A pH value of 7 is neutral, while a pH below 7 is acidic and a pH above 7 is basic (alkaline).
Potassium hydroxide is a strong alkali with a pH value of approximately 13. This means it can corrode metals, concrete, and other materials it comes in contact with.
By measuring the pH of the spill, we can determine how corrosive it is and take the necessary steps to mitigate the corrosive effects. It is important to note that corrosion is not the same as toxicity.
Corrosion can cause serious damage, but the effects can often be reversed with proper mitigation and cleaning.
In order to measure the pH of a potassium hydroxide spill, it is important to use a pH meter with a temperature probe. This is because the pH of a solution can vary with temperature.
The pH meter should also be calibrated correctly before use, as incorrect readings can lead to incorrect conclusions.
After the pH meter is in place, readings can be taken of the spill and compared to a baseline reading from an uncontaminated sample in order to determine the level of corrosivity of the spill.
Appropriate actions can then be taken to mitigate the corrosive effects.
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How many moles are 1.20 x 10^25 atoms of phosphorus
Answer: 19.969 moles
Explanation: A mole is a very important unit of measurement that chemists use. A mole of something means you have 602,214,076,000,000,000,000,000 of that thing, like how having a dozen eggs means you have twelve eggs. Chemists have to measure using moles for very small things like atoms, molecules, or other particles.
do how much salt do you add to a gallon of wateres how much salt does it take to purify a boiling pot of water salt purify water?
When using salt to purify water, the general recommendation is to add 1/8 to 1/4 teaspoon of salt per gallon of water. Salt is used in the water purification process because it can kill or inhibit the growth of harmful bacteria and other microorganisms that can cause diseases and illnesses.
Here are the steps to purify a boiling pot of water with salt:
1. Boil the water: Bring the water to a rolling boil for at least one minute.
2. Add salt: Once the water has boiled, add 1/8 to 1/4 teaspoon of salt per gallon of water.
3. Stir: Stir the water until the salt has dissolved.
4. Wait: Let the water sit for at least 30 minutes. During this time, the salt will kill or inhibit the growth of harmful bacteria and other microorganisms.
5. Taste: After the 30 minutes have passed, taste the water to see if it has a slightly salty taste. If it does, the water is safe to drink. If not, add more salt and repeat the process.
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in which labeled portion of the curve would you use the heat of vaporization to calculate the heat absorbed?
Answer: To calculate the heat absorbed using the heat of vaporization, you would use the portion of the curve labeled "Evaporation."
What is Heat of Vaporization?Heat of vaporization is the energy required to transform a liquid into a vapor at a constant temperature, and it is expressed in joules per mole. Heat of vaporization is also known as enthalpy of vaporization, and it is a function of the substance's properties, temperature, and pressure.
The enthalpy of vaporization, like other thermodynamic properties, is often displayed as a function of temperature in a phase diagram, which shows the physical conditions (pressure, temperature, volume, etc.) at which different phases of a substance are stable. The temperature at which the vaporization process occurs is the boiling point.
The boiling point is the temperature at which the vapor pressure equals the external pressure, allowing bubbles of vapor to form within the liquid. During the process, heat is consumed to transform a liquid into a vapor, which is the heat of vaporization.
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158 ml of a 0.148m nacl solution is added to 228 ml of a 0.369m nh4no3 solution. the concentration of ammonium ions in the resulting mixture is
The concentration of ammonium ions in the resulting mixture is 0.104 M.
The number of moles of NaCl that is added to the solution. Convert the volume of NaCl solution into liters:158 mL × (1 L/1000 mL) = 0.158 L
Calculate the number of moles of NaCl using the formula: moles = concentration × volumeMoles of NaCl = 0.148 mol/L × 0.158 L = 0.0234 moles
Repeat the above process for ammonium nitrate. 228 mL × (1 L/1000 mL) = 0.228 L0.369 mol/L × 0.228 L = 0.0841 moles of ammonium nitrate
The number of moles of ammonium ions that is produced by 0.0841 moles of ammonium nitrate.NH4NO3(s) → NH4+(aq) + NO3-(aq)Mole ratio between NH4NO3 and NH4+ = 1:1
Therefore, moles of NH4+ = moles of NH4NO3 = 0.0841 molesStep 4: Determine the final volume of the solution.Vfinal = VNaCl + VNH4NO3Vfinal = 0.158 L + 0.228 L = 0.386 L
The concentration of ammonium ions using the formula: moles/volumeConcentration of ammonium ions = 0.0841 moles/0.386 L = 0.2179 moles/L
Concentration of ammonium ions in the resulting mixture = 0.2179 mol/L = 0.104 M. Therefore, the concentration of ammonium ions in the resulting mixture is 0.104 M.
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what must be true for precipitation to occur? group of answer choices qsp > ksp qsp < ksp precipitation always occurs with sparingly soluble compounds none of these
For precipitation to occur, the value of Qsp (the ion product constant) should be greater than the solubility product constant (Ksp).
Precipitation is the conversion of a dissolved substance into a solid, which then settles out of a solution. Precipitation occurs when a liquid solution is cooled or heated, causing it to become super-saturated with one or more solutes. A solution's super-saturation means that it contains more of a solute than it can contain at equilibrium.
A tiny seed crystal of the solute is added to the solution to kick off the precipitation. The seed crystal provides a template for the rest of the solute to nucleate and form a solid. For precipitation to occur, the value of Qsp (the ion product constant) should be greater than the solubility product constant (Ksp). When Qsp is greater than Ksp, the solution is supersaturated and precipitates are formed. If Qsp is less than Ksp, the solution is unsaturated and no precipitation occurs.
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a perchloric acid solution has a ph of 3.158. what is the concentration of perchlorate ion in this solution?
The concentration of perchlorate ion in the solution that has a ph of 3.158 is 7.9 × 10−4 M.
Perchloric acid has the chemical formula HClO4. When it dissolves in water, it completely dissociates into H+ ions and ClO4- ions. The pH of a solution is defined as the negative logarithm of the hydrogen ion concentration [H+].A perchloric acid solution with a pH of 3.158 has an [H+] of 7.9 × 10−4 M, according to the following formula:
pH = −log [H+]
The concentration of the perchlorate ion [ClO4-] can be calculated using the following formula:
Kw = [H+][OH-] = 1 × 10-14 = [H+]2[H+] = 1 × 10-14[H+] = √(1 × 10-14) = 1 × 10-7M[OH-] = Kw/[H+] = (1 × 10-14) / (1 × 10-7) = 1 × 10-7M
The concentration of ClO4- is equal to the concentration of H+ because they are present in equal amounts as a result of complete dissociation of perchloric acid: [ClO4-] = [H+] = 7.9 × 10−4 M.
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write an equation for each acid or base showing its ionization in water, and write the equilibrium constant expression for the weak acid or base
The equation for the ionization of a weak acid in water is HA + H₂O ⇌ H₃O⁺ + A⁻, and the equilibrium constant expression for this reaction is K = [H₃O⁺ ][A⁻]/[HA].
The ionization of a weak base in water is B + H₂O ⇌ OH⁻ + BH+, and the equilibrium constant expression for this reaction is K = [OH⁻][BH⁺]/[B].
Weak acids and bases partially dissociate into their ions in aqueous solutions. For a weak acid, HA, the equilibrium expression for its ionization is HA + H₂O ⇌ H₃O⁺ + A⁻, and the corresponding equilibrium constant expression is K = [ H₃O⁺ ][A-]/[HA].
The same process happens with a weak base, B, where the equilibrium expression is B + H₂O ⇌ OH⁻ + BH⁺, and the corresponding equilibrium constant expression is K = [OH⁻][BH⁺]/[B]. Thus, the equations for the ionization of both weak acids and bases and the corresponding equilibrium constant expressions can be
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why makes a metal ion have delocalised electrons
Answer:
Explanation:
Having more electron shells means that the valence electrons are farther from the nucleus and 'feel' less attraction to the protons. This is why metals are more able to lose their electrons in ionic bonds and delocalize their electrons in metallic bonds, since they don't have as strong of a pull on them as non-metals.
the radius of a single atom of a generic element x is 123 picometers (pm) and a crystal of x has a unit cell that is body-centered cubic. calculate the volume of the unit cell.
The radius of a single atom of a generic element x is 123 picometers (pm) and a crystal of x has a unit cell that is body-centered cubic. So, the volume of the unit cell is 11.5482 x 10⁻²⁴ cm³.
Given,
The radius of a single atom of a generic element x is 123 picometers (pm) and a crystal of x has a unit cell that is body-centered cubic.
Body-Centered Cubic (BCC):
In a Body-Centered Cubic unit cell, each corner of the cube has a corner atom, and there is an additional atom in the center of the cube. The atom that is centered on the unit cell is surrounded by eight neighboring atoms, each of which is located at a distance of
4R/√3,
where R is the radius of the atom.
The volume of the unit cell = (4 * radius of the atom)^3/3
For BCC, volume of the unit cell is
(4 * radius of the atom)^3/3
= (4 * 123 pm)^3/3
= 11.5482 x 10⁻²⁴ cm³
The volume of the unit cell is 11.5482 x 10⁻²⁴ cm³.
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which physical method can separate a mixture of steel ball bearings and marbles?boilingevaporationfiltrationsorting
The physical method that can separate a mixture of steel ball bearings and marbles is sorting.
The process of separating the components of a mixture is referred to as separation. A mixture of steel ball bearings and marbles can be separated using the sorting method. .Sorting is a process of separating components of a mixture by hand.
Steel ball bearings and marbles can be sorted based on their appearance, size, and weight. The process of sorting is the simplest method of separation that does not require any special tools or equipment. Hence, the physical method that can separate a mixture of steel ball bearings and marbles is sorting.
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Answer:
It’s D sorting
Explanation:
I got it correct duh
which of the following substances would undergo dissociation when placed into a polar solvent? question 1 options: c6h12o6 h2o2 mgcl2 co2
The substance that would undergo dissociation when placed into a polar solvent is option C which is MgCl2.
Dissociation explained.
Dissociation refers to the separation of a molecule or compound into smaller particles, such as ions or radicals, usually in a solvent or under the influence of a certain energy input, such as heat or light.
In the context of chemistry, dissociation often refers to the separation of an ionic compound into its constituent ions in a solvent, such as water
MgCl2 is an ionic compound that consists of Mg2+ cations and Cl- anions. When this compound is placed in a polar solvent, such as water, the polar water molecules surround the ions and separate them from one another, resulting in the dissociation of the compound into its constituent ions.
Therefore, other substances listed, C6H12O6 (glucose), H2O2 (hydrogen peroxide), and CO2 (carbon dioxide), are not ionic compounds and do not dissociate into ions when placed in a polar solvent. Glucose and hydrogen peroxide are polar molecules, but they do not ionize in water. Carbon dioxide is a nonpolar molecule and is insoluble in water.
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a mixture of two gases with a total pressure of 2.00 atm contains 0.70 atm of gas a. what is the partial pressure of gas b in atm? 1 . 3 0
The partial pressure of gas B in a mixture of two gases can be found by subtracting the partial pressure of gas A from the total pressure of the mixture. In this case, the partial pressure of gas B is 1.30 atm.
To find partial pressure of gas B in the mixture of two gases : Partial pressure of gas B = Total pressure - Partial pressure of gas A
Given that the total pressure of the mixture is 2.00 atm and the partial pressure of gas A is 0.70 atm: Partial pressure B = 2.00 atm - 0.70 atm
Partial pressure of gas B = 1.30 atm.
Therefore, the partial pressure of gas B in the mixture is 1.30 atm.
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if a sample containing 6.5 moles of nh3 is reacted with excess cuo, how many moles of each product can be made? n2
The amount of N2 (Nitrogen) produced will be limited by the amount of NH3 (Ammonia) present. Thus, the maximum amount of N2 that can be produced is 1.625 moles (which is half of the 3.25 moles calculated above). Therefore, the answer is 1.625 moles of N2.
If a sample containing 6.5 moles of NH3 is reacted with excess CuO, 1.625 moles of N2 can be produced. There are two products that can be produced by the reaction of NH3 with excess CuO: N2 and H2O. The balanced equation for this reaction is as follows: 4NH3 + 3CuO → 2N2 + 3H2O + 3CuTo determine how many moles of each product can be made, we need to use the mole ratio between NH3 and the products. From the balanced equation, we can see that for every 4 moles of NH3, 2 moles of N2 can be produced. Therefore, for 6.5 moles of NH3, we can calculate the amount of N2 produced as follows:6.5 moles NH3 × (2 moles N2/4 moles NH3) = 3.25 moles N2However, we have to remember that the reaction is carried out with excess CuO. This means that all of the NH3 will be consumed, and there will be enough CuO (Copper oxide) to react with all of it. Therefore, the amount of N2 produced will be limited by the amount of NH3 present. Thus, the maximum amount of N2 that can be produced is 1.625 moles (which is half of the 3.25 moles calculated above). Therefore, the answer is 1.625 moles of N2.
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if 100 j of heat was appled to a 50g cube of each material, which metal would experince the greatest temperature change?
Copper would experience the greatest temperature change.
Copper has the lowest specific heat capacity of the metals, meaning it can absorb the most heat before its temperature increases. As a result, copper will experience the greatest temperature change when 100 j of heat is applied to a 50g cube.
Specific heat capacity is defined as the amount of energy, in joules, needed to raise the temperature of 1 gram of a substance 1 degree Celsius (C). The specific heat capacity of copper is 0.385 j/g*C, while that of aluminum is 0.903 j/g*C and that of iron is 0.444 j/g*C. Since copper has the lowest specific heat capacity of these metals, it is able to absorb more energy than the other metals.
For example, when 100 j of heat is applied to a 50g cube of each metal, the temperature increase for copper would be approximately 0.77 degrees Celsius, the temperature increase for aluminum would be approximately 0.45 degrees Celsius, and the temperature increase for iron would be approximately 0.22 degrees Celsius.
So, copper would experience the greatest temperature change.
Therefore, the metal that would experience the greatest temperature change when 100 j of heat is applied to a 50g cube is copper.
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what is the percent yield if 578 g of h3po4 are produced when 10.0 moles of water react with an excess of p4o10?
The percent yield of H₃PO₄ when 10.0 moles of water react with an excess of P₄O₁₀ is 88.4%.
The balanced chemical equation is:
P₄O₁₀ + 6H₂O → 4H₃PO₄
We can find the theoretical yield of H₃PO₄ by using stoichiometry, which is the relationship between the number of moles of the reactants and products in a chemical reaction.
6.0 mol of H₂O reacts with P₄O₁₀ to give 4 moles of H₃PO₄ according to the balanced chemical equation.
Therefore, the number of moles of H₃PO₄ formed will be:
10.0 mol of H₂O x (4 mol of H₃PO₄ / 6 mol of H2O) = 6.67 mol of H₃PO₄
Now we can find the theoretical yield of H₃PO₄ using its molar mass, which is 98.0 g/mol.
Theoretical yield = 6.67 mol of H₃PO₄ x 98.0 g/mol = 653.6 g of H₃PO₄
The actual yield of H₃PO₄ formed in the reaction is given as 578 g.
Percent yield = actual yield / theoretical yield x 100%
Percent yield = 578 g / 653.6 g x 100% = 88.4%
Therefore, the percent yield will be lower than the expected value of 100%. It will be 88.4%.
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Fetal death that occurs after the fetus has reached a certain growth that is too large to resorb into the uterus is which one of the following?A. Spalding signB. Nonimmune hydropsC. Fetus papyraceousD. Stuck twin
The fetal death that occurs after the fetus has reached a certain growth that is too large to resorb into the uterus is known as fetus papyraceous.
The fetus is compressed and flattened due to the pressure of the adjacent growing fetus or maternal tissue. The fetus is partially or completely desiccated and flattened, leaving only a parchment-like, thin, and papery skin layer covering the soft tissues.
What is Fetus papyraceous?Fetus papyraceous refers to a dead fetus that has become mummified and flattened into a parchment-like membrane because of compression by an adjacent living fetus or maternal tissue after the death of the other fetus. It is a rare form of fetal death that occurs in multifetal gestations.
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the pressure on a balloon holding 433 ml of an ideal gas is increased from 688 torr to 1.00 atm. what is the new volume of the balloon (in ml) at constant temperature?
Answer:
pressure on a balloon holding 433 ml of an ideal gas is increased from 688 torr to 1.00 atm. what is the newpressure on a balloon holding 433 ml of an ideal gas is increased from 688 torr to 1.00 atm. what is the new volume of the balloon (in ml) at constant temperature
a diatomic molecule contains i. atoms of two different elements bonded together with a covalent bond. ii. two atoms of the same element bonded together with a covalent bond. iii. two lone pairs of electrons.
A diatomic molecule consists of two atoms of the same element or two atoms of different elements, bonded together with a covalent bond, or in some cases, two lone pairs of electrons. So all statements are true.
A diatomic molecule is a molecule made up of two atoms of the same element or two atoms of different elements bonded together. The bonding of the atoms is usually done through a covalent bond, meaning that electrons are shared between the two atoms in order to create a stable arrangement. In the case of two atoms of different elements, each atom has a different electronegativity, resulting in the formation of a polar covalent bond. This means that the electrons will be pulled closer to one atom than the other, resulting in an overall dipole moment for the molecule. In the case of two atoms of the same element, a nonpolar covalent bond is formed. This means that the electrons are shared equally between the two atoms and no dipole moment is formed. In some cases, two lone pairs of electrons may be present instead of a covalent bond. This results in a molecule with a larger overall dipole moment.
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ammonia, nh3, is a common ingredient in many household cleaning agents. if a cleaning agent contains 4.03 mol nh3, how many grams of nh3 are in the cleaning agent?
[tex]NH_{3}[/tex] has a molar mass of 17 g/mol, so 4.03 moles of [tex]NH_{3}[/tex] would contain 68.51 grams of the compound. Therefore, a cleaning agent containing 4.03 moles of [tex]NH_{3}[/tex] would contain 68.51 grams of the compound.
The given compound is ammonia [tex]NH_{3}[/tex]. [tex]NH_{3}[/tex] is present in a lot of cleaning agents in homes, which makes it an extremely useful compound. It can help to remove stains and dirt from a variety of surfaces. We need to calculate the mass of the ammonia present in the cleaning agent. Here, we have been given that the amount of [tex]NH_{3}[/tex] in the cleaning agent is 4.03 mol.
We can use the molar mass of [tex]NH_{3}[/tex] to convert this into its mass. Molar mass of [tex]NH_{3}[/tex] = 17 g/mol
Formula: Mass (m) = Number of moles (n) x Molar mass (M)
Substituting the values: Mass (m) = 4.03 mol x 17 g/mol = 68.51 g.
Therefore, the mass of [tex]NH_{3}[/tex]in the cleaning agent is 68.51 grams.
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what is the formula for the ionic compound formed by calcium and selenium? group of answer choices case case2 case3 ca2se ca3se
Answer: CaSe
Explanation:
Step 1: Ca has a +2 charge as a cation. Se has a -2 charge as an anion.
Ca²⁺ Se²⁻
Step 2: Use the "swap and drop" method. Swap the numbers on each ion and then drop them as subscripts. Omit the + and -.
Ca₂Se₂
Step 3: When the subscripts are the same, you can omit them and write the answer as CaSe.
The correct answer is option a) CaSe.
Ionic compounds are formed when a metal and a non-metal react.
In this case, calcium is a metal and selenium is a non-metal. This reaction forms a cation (positively charged ion) of calcium and an anion (negatively charged ion) of selenium.
The formula for the compound is the combination of the symbols of the two elements with the charges balanced. Since calcium is a +2 cation and selenium is a -2 anion, the compound's formula is CaSe.
Therefore, the formula for the ionic compound formed by calcium and selenium is CaSe.
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