ch 11. determine the amount of heat (in KJ) requirewd to vaporize 1.55 kg of water at its boiling point. For water, Delta Hvap = 40.7 kj/mol at 100 C
a. 3.50 x 10^3
b. 1.14 x 10^6
c. 211
d. 686

Answers

Answer 1

The amount of heat required for vaporization is 3504.67kJ. The correct option is option A.

The heat of vaporization/condensation also represents the amount of heat exchanged during a phase shift.

For vaporization, it is the quantity of heat needed to convert 1 g of water to 1 g of water vapor.

Given,

Mass of water = 1.55 kg

ΔH = 40.7kJ/mol

moles of water = mass ÷ molar mass

= 1550g ÷ 18

= 86.11 moles

Amount of heat required = nΔH

                                       = 86.11 × 40.7

                                        = 3504.67kJ = 3.50 × 10³ kJ

Thus, the correct option is option A.

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Related Questions

a chemist determines that a sample contains 0.15ug of U-235 and that the sample has undergone two half lives how much U-235 was there originally, before the same decayed?

Answers

The sample contains 0.15 μg of Uranium-235 and has undergone two half-lives, then the original amount of Uranium-235 would have been 0.6 μg.

The half-life of U-235 is 7.04 × 10⁸ years.

The amount remaining can be calculated using the formula:

Amount remaining = Original Amount × (1/2)^(number of half-lives)

We know that the sample contains 0.15ug of U-235 and has undergone two half-lives. Let’s call the original amount of U-235 “X”. Then we can write:

0.15ug = X × (1/2)²

Solving for X gives us:

X = 0.15ug / (1/4) = 0.6ug

Therefore, there was 0.6ug of U-235 originally before it decayed.

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24. What is a commercial application of benzoic acid?

Answers

Commercial Applications of benzoic acid : as food preservative , medicine industry, pharmaceuticals .

Applications of benzoic acid in details :

Benzoic acid is commonly used as a food preservative due to its ability to inhibit the growth of bacteria, yeasts, and molds.

It is also used in the production of various chemicals such as phenol, benzoyl chloride, and sodium benzoate. Benzoic acid is used in pharmaceuticals.

It is used as a preservative in drugs. It is also present in baby products, skin products, cleansing products, hair and nail products, soaps, bath products, detergents etc.

Additionally, benzoic acid is used in the manufacturing of pharmaceuticals, cosmetics, and plastics.

Its antiseptic and antifungal properties also make it useful in the treatment of skin infections. It is used as an antifungal for treating diseases like ringworm and athlete’s foot. It is excreted as hippuric acid after conjugation with glycine in the liver. The excreted hippuric acid is not highly toxic. It is used in the treatment of skin irritation caused by insect bites, burns etc.

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The reaction of 60.0 g of aluminum oxide with 30.0 g of carbon produced 22.5 g of
aluminum. What is the percent yield for this reaction?
Al2O3 + 3C = 2Al + 3CO
A) 25.0 % B) 31.8 % C) 44.9 % D) 50.1 % E) 70.9 %

Answers

The percent yield for the reaction is approximately 50.1%. The correct answer is option D.

To determine the percent yield for this reaction, we'll first find the limiting reactant and then calculate the theoretical yield. Finally, we'll compare the theoretical yield to the actual yield (22.5 g of aluminum) to find the percent yield.

1. Calculate moles of reactants:
Al2O3: 60.0 g / (2 × 26.98 g/mol + 3 × 16.00 g/mol) ≈ 1.000 mol
C: 30.0 g / 12.01 g/mol ≈ 2.498 mol

2. Identify limiting reactant:
Since the stoichiometry is Al2O3 + 3C, we'll divide the moles of carbon by 3 and compare it to the moles of aluminum oxide:
(2.498 mol C) / 3 ≈ 0.833 mol
Since 0.833 mol < 1.000 mol, carbon is the limiting reactant.

3. Calculate theoretical yield:
Using the stoichiometry (2 mol Al produced per 3 mol C), we can calculate the theoretical yield of aluminum:
(2/3) × 2.498 mol C ≈ 1.665 mol Al
1.665 mol Al × 26.98 g/mol ≈ 44.9 g Al

4. Calculate percent yield:
Percent yield = (actual yield / theoretical yield) × 100
= (22.5 g Al / 44.9 g Al) × 100 ≈ 50.1%

For this reaction the percent yield  is approximately 50.1%,

so the correct answer is D) 50.1%.

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QUESTION 6

How many grams of O₂ are used to produce 0. 72 liters of CO2 gas at standard temperature and pressure? __[a]___g

C3H8 +502->3CO2 + 4H₂O

Give the answer to 3 decimal places.

QUESTION 7

If 73. 0 g of aluminum chloride decomposes, how many molecules of chlorine gas are made?___ __[a]___x 1023

2AIC13 --> 2A1+ 3Cl2

Give the answer to two decimal places.

Click Save and Submit to save and submit Click Save All Answers to save all answers

Answers

6) The grams of the O₂ are used to produce 0.72 L of CO₂ gas at standard the temperature and the pressure is 0.10 g.

7) If 73 g of the aluminum chloride decomposes, the molecules of chlorine gas is 3.25 × 10²² molecules.

6) The chemical equation is as :

C₃H₈ +    5O₂    ---->   3CO₂  +  4H₂O

The ideal gas is as :

P V = n R T

Where,

The Pressure, P = 1 atm

The temperature, T = 273 K

The volume, V = 0.72 L

The gas constant, R = 0.823 L atm K⁻¹mol⁻¹

The moles, n = ?

n = P V / R T

n = ( 1 × 0.72 ) / 0.823 × 273

n = 0.0032 mol

The mass of the O₂ = moles × molar mass

The mass of the O₂ = 0.0032 × 32

The mass of the O₂ = 0.10 g

7) The chemical equation is :

2AICl₃ --> 2Al+ 3Cl₂

The mass of the AICl₃ = 73 g

The number of the moles of the AICl₃ = mass / molar mass

The number of the moles of the AICl₃ = 73 / 133.33

The number of the moles of the AICl₃ = 0.54 mol

The number of the molecules = 0.54 × 6.022 × 10²²

The number of the molecules of the AICl₃ = 3.25 × 10²² molecules.

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Calculate the amount of heat (in kJ) necessary to raise the temperature of 47.8 g benzene by 57.0 K. The specific heat capacity of benzene is 1.05 J/g°C

Answers

It takes 2.79669 kJ of heat to raise the temperature of 47.8 g of benzene by 57.0 K.

To calculate the amount of heat necessary to raise the temperature of benzene, we can use the formula:

Q = m * c * ΔT

where Q is the amount of heat, m is the mass of benzene, c is the specific heat capacity of benzene, and ΔT is the change in temperature.

Substituting the given values, we get:

Q = 47.8 g * 1.05 J/g°C * 57.0 K

Q = 2796.69 J

To convert J to kJ, we divide by 1000:

Q = 2.79669 kJ

Therefore, it takes 2.79669 kJ of heat to raise the temperature of 47.8 g of benzene by 57.0 K.

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After extraction you have an organic and an aqueous layer. Describe how you will recover the solutes from each layer.

Answers

The recovery of solutes from each layer depends on the nature of the solutes and the solvent used for the extraction. Proper selection of the extraction method and appropriate recovery steps are necessary to achieve optimal recovery and purity of the solutes.

After extraction, the solutes are partitioned between the organic and aqueous layers. To recover the solutes from each layer, different methods can be used.

For the organic layer, the solutes can be recovered by evaporating the solvent or by adding a suitable reagent that will react with the solutes and form a precipitate. Once the solutes have been recovered, they can be further purified if necessary.

For the aqueous layer, the solutes can be recovered by adjusting the pH and adding salt or a solvent that will extract the solutes from the aqueous layer into the organic layer. Alternatively, the solutes can be recovered by using a solid phase extraction (SPE) column, which selectively adsorbs the solutes from the aqueous layer onto a solid support.

To recover the solutes from the organic and aqueous layers after extraction, follow these steps:

1. Separate the layers: Using a separatory funnel, carefully separate the organic layer and the aqueous layer into two distinct containers.

2. Recover solutes from the organic layer: Evaporate or distill the organic solvent to isolate the solute, leaving behind a solid or concentrated solution of the solute.

3. Recover solutes from the aqueous layer: Perform a crystallization or evaporation process to remove the water, yielding a solid or concentrated solution of the solute.

By following these steps, you can efficiently recover the solutes from both the organic and aqueous layers after extraction.

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64) Determine the name for HIO3.A) hydroiodic acidB) hydroiodus acidC) iodate acidD) iodic acidE) periodic acid

Answers

The correct name for HIO3 is iodic acid. HIO3 is an oxyacid, which means it consists of hydrogen, oxygen, and a central non-metal element, in this case, iodine. The correct option is D).

Oxyacids generally have a structure where the central non-metal element is surrounded by oxygen atoms, which are then connected to hydrogen atoms.

In the case of HIO3, the central element is iodine, and the oxyanion is the iodate ion (IO3-). When naming oxyacids, the "-ate" ending of the oxyanion is replaced with "-ic," followed by the word "acid." Therefore, the name for HIO3 is derived from the iodate ion and becomes iodic acid.

It is essential to distinguish iodic acid from other similar compounds.

Option A) hydroiodic acid refers to HI, a binary acid consisting of hydrogen and iodine without oxygen.

Option B) hydroiodus acid is not a recognized name for any compound.

Option C) iodate acid is an incorrect name for HIO3, as oxyacids should have the "-ic" ending.

Option E) periodic acid refers to HIO4, a different oxyacid with one more oxygen atom than iodic acid.

Thus, D. iodic acid is the correct option.

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what is the redox reaction in a lead storage battery?

Answers

In a lead storage battery, a redox reaction occurs between the lead oxide and the lead on the electrodes. During discharge, the lead oxide on the positive electrode reacts with the sulfuric acid electrolyte to form lead sulfate and water, while electrons are released.

Here are some additional points about the redox reaction in lead storage batteries:

During charging, the redox reaction is reversed, with lead sulfate on both electrodes being converted back to lead oxide and lead, while water and sulfuric acid are regenerated in the electrolyte.The amount of energy that a lead storage battery can deliver is proportional to the amount of active material on the electrodes, which determines the capacity of the battery.Lead storage batteries are commonly used in applications such as automotive starting, lighting, and ignition systems, uninterruptible power supplies, and backup power for telecommunications systems.

At the same time, lead on the negative electrode reacts with the sulfate ions in the electrolyte to form lead sulfate and more electrons. The released electrons then flow through the external circuit, powering a device, before returning to the battery through the positive electrode.

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what is the purpose of adding anhydrous mgso4 to the ether solution ? what would occur if this step were omitted?

Answers

The purpose of adding anhydrous MgSO4 to the ether solution is to remove any remaining water from the solution. Water can interfere with the reaction or extraction process and cause unwanted side reactions or impurities. If this step were omitted, the presence of water in the ether solution could lead to undesirable results.

Anhydrous MgSO4 is a powerful desiccant that can absorb the water molecules from the solution, leaving it dry and free of moisture.

Water can react with some of the reagents or products, altering the yield or purity of the final product. Additionally, water can promote the growth of bacteria or other microorganisms in the solution, which can cause contamination and affect the safety of the process.

Therefore, adding anhydrous MgSO4 is an essential step in many chemical reactions and extractions that require a dry environment. It ensures that the solution is free of water and ready for the next step in the process.

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____________ is a polyacrylamide gel electrophoresis method for proteins that occurs under denaturing conditions to separate proteins by mass

Answers

SDS-PAGE is a polyacrylamide gel electrophoresis method for proteins that occurs under denaturing conditions to separate proteins by mass

SDS-PAGE (sodium dodecyl sulfate-polyacrylamide gel electrophoresis) is a widely used technique to separate proteins based on their molecular weight. The method is carried out under denaturing conditions to unfold and linearize the protein molecules, and then separate them based on their size.

In SDS-PAGE, the sample of proteins is first mixed with a buffer containing SDS, a strong anionic detergent that denatures the proteins and coats them with a negative charge proportional to their mass. The sample is then heated to further denature the proteins and break down any secondary and tertiary structures. The SDS-bound proteins are now uniformly negatively charged, and can be separated by size using a polyacrylamide gel.

The polyacrylamide gel acts as a molecular sieve, with smaller proteins migrating more quickly through the gel than larger ones. The gel is formed by polymerizing acrylamide and crosslinking agents to form a three-dimensional network of pores that create a size-dependent resistance to the migration of the negatively charged protein molecules. A voltage gradient is applied across the gel, causing the proteins to migrate towards the positive electrode. The separation is based on the principle that the mobility of a protein is inversely proportional to its size.

After separation, the proteins are visualized by staining with a protein-specific dye, such as Coomassie Brilliant Blue, or transferred to a membrane for detection by Western blotting. The resulting protein bands can be quantified and analyzed to identify and characterize the proteins present in the sample.

Overall, SDS-PAGE is a powerful and versatile tool for protein analysis, widely used in research and diagnostic laboratories for a variety of applications, including protein purification, protein quantification, and protein identification.

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How many moles of oxygen are produced when 3.0 moles of potassium
chlorate decompose completely?

Balance this equation
_?_KClO4 → _?_KCl + _?_O2

Answers

Answer:

0.24

Explanation:

In order for a liq-liq extraction to be successful, an appropriate extraction solvent must be chosen. What are the two most important characteristics of a good extraction solvent? Explain.

Answers

Thus not only should the solvent be selective for the solute being extracted but it should also possess other desirable features such as low cost, low solubility in the feed-phase and good recoverability as well as being noncorrosive and noninflammable.

Which one is considered to be the solvent if the solvent and the solute is present in equal amount in the solution?

Answers

If the solvent and solute are present in equal amounts in a solution, the solvent is still considered to be the substance that is capable of dissolving the solute.

A solvent is a substance that dissolves the solute and forms the solution. Even if the two substances are present in equal amounts, the solvent is still playing an active role in dissolving the solute. The substance known as the solvent is typically what determines whether a solution is in a solid, liquid, or gaseous state. The product that the solvent dissolves is known as the solute. A solvent is capable of dissolving the solute to form a solution and the solute is the substance that dissolves in a solvent giving rise to a solution.

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Complete the following equilibrium reaction and also predict whether the equilibrium lies to the left (Kc < 1) or to the right (Kc > 1):NO3- + H2O -->O2-+ H2O -->

Answers

The equilibrium lies to the left, with Kc < 1, favoring the reactants.

The given reaction is:

NO3- + H2O ⇌ O2- + H2O

First, let's complete the reaction. We need to balance the reaction by adding an H+ ion to the products side:

NO3- + H2O ⇌ O2- + H2O + H+

Now, we need to determine if the equilibrium lies to the left (Kc < 1) or to the right (Kc > 1). To do this, we need to analyze the stability of the reactants and products. NO3- is a stable ion since it is a conjugate base of a strong acid, HNO3. On the other hand, O2- is a very strong base, making it less stable. Therefore, the equilibrium will likely favor the more stable reactant side:

NO3- + H2O ⇌ O2- + H2O + H+ (Kc < 1)

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The densities of a coinage metals (copper,silver, and gold) are as follows: copper = 8.95 g/mLsilver = 12.59 g/mLgold = 19.32 g/mL Calculate the density of mass = 33.03 g and volume = 2.624 mL, and identify the metal.

Answers

The calculated density (12.58 g/mL) is very close to the density of silver (12.59 g/mL). Therefore, the metal is likely to be silver.

To calculate the density of the metal with mass = 33.03 g and volume = 2.624 mL, you can use the formula:

Density = Mass / Volume

Step 1: Plug in the given values into the formula:
Density = 33.03 g / 2.624 mL

Step 2: Calculate the density:
Density ≈ 12.58 g/mL

Now, compare the calculated density with the given densities of the coinage metals:
- Copper = 8.95 g/mL
- Silver = 12.59 g/mL
- Gold = 19.32 g/mL

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Why can't you repeat recrystallization multiple times?

Answers

Recrystallization is a technique used to purify solid compounds. The process involves dissolving the impure compound in a hot solvent and allowing it to cool, leading to the formation of pure crystals.

However, repeating the recrystallization process multiple times can be detrimental to the purity of the compound. This is because every time the impure compound is dissolved in a solvent, a small amount of the compound will remain in the solvent.

The solvent used in the recrystallization process is not 100% pure, and therefore, the impurities that remain in the solvent will be introduced into the purified crystals. As a result, repeating the recrystallization process multiple times will lead to a decrease in the purity of the compound rather than an increase.

Therefore, it is recommended to limit the number of recrystallizations to two or three at most to obtain a high purity of the compound.

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where are nonmetals found in the periodic table?
a) right side
b) left side
c) top half
d) bottom half

Answers

Nonmetals are found in the periodic table on the right side (Option A).

Nonmetals are the elements which form negative ions by accepting or gaining electrons. Non-metals usually have 4, 5, 6 or 7 electrons in their outermost shell. Characteristic properties of nonmetals are high ionization energies and high electronegativity. Owing to these properties, non-metals usually gain electrons when react with other compounds, forming covalent bonds. Nonmetals are generally located in Groups 14-18, with the exception of hydrogen, which is found in Group 1.

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The major source of radon in houses in the United States isfurniture and carpetsthe underlying bedrockthe tropospherenuclear power plantsfossil-fuel combustion

Answers

The major source of radon in houses in the United States is from the underlying bedrock, not from furniture or carpet. Fuel combustion may also contribute.

The significant wellspring of radon in houses in the US is the hidden bedrock. Radon is a radioactive gas that is delivered normally in the World's outside, and it can saturate structures through breaks and holes in the establishment.

This is especially normal in regions with stone or different sorts of rock that have a high centralization of uranium. Furniture and rugs are not huge wellsprings of radon, nor is the lower atmosphere.

Thermal energy stations really do deliver modest quantities of radon, however this is definitely not a significant wellspring of openness for the vast majority. Petroleum product ignition can likewise deliver radon, however this is certainly not a significant wellspring of openness in the US.

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66) Calculate the molar mass for Ba(ClO4)2.A) 336.23 g/molB) 236.78 g/molC) 99.45 g/molD) 137.33 g/molE) 188.78 g/mol

Answers

The molar mass of Ba(ClO4)2 is 336.23 g/mol. The correct option is A.

To calculate the molar mass of Ba(ClO4)2, we need to add the atomic masses of all the elements present in the compound.

Ba(ClO4)2 contains barium (Ba), chlorine (Cl), and oxygen (O).

The atomic mass of barium is 137.33 g/mol.

The atomic mass of chlorine is 35.45 g/mol, but in this compound, it is present as a polyatomic ion (ClO4). The molecular mass of ClO4 is (35.45 + 4x16.00) = 99.45 g/mol.

Since there are two ClO4 ions in the compound, we need to multiply the molecular mass of ClO4 by 2:

2 x 99.45 g/mol = 198.90 g/mol

Now we can add the atomic masses of all the elements:

137.33 g/mol + 198.90 g/mol = 336.23 g/mol

Therefore, the molar mass of Ba(ClO4)2 is 336.23 g/mol, option A.

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What is the correct electron configuration of the ion formed by sulfur?a. [Ne]3s 23p 5b. [Ne]3s 23p 4c. [Ar]d. [Ne]

Answers

The correct electron configuration of the ion formed by sulfur is [Ne]3s²3p⁶. The answer is a.

Sulfur has an atomic number of 16, which means a neutral sulfur atom has 16 electrons distributed in its electron shells. The electron configuration of a neutral sulfur atom is [Ne]3s²3p⁴, indicating that there are two electrons in the 3s subshell and four electrons in the 3p subshell.

When sulfur forms an ion, it typically gains two electrons to achieve a stable octet configuration, forming the S²⁻ ion. The addition of two electrons to the 3p subshell results in the electron configuration of [Ne]3s²3p⁶ for the S²⁻ ion.

It is important to note that the electron configuration of an ion reflects the number and arrangement of electrons in the ion's valence shell, which can differ from that of the neutral atom.

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the carbon atom bonded to both the ring oxygen atom and a hydroxyl group is known as the

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The carbon atom bonded to both the ring oxygen atom and a hydroxyl group is known as anomeric carbon.

In organic chemistry, the anomeric carbon is the carbon atom in a cyclic hemiacetal or hemiketal that is bonded to both an oxygen atom and a hydroxyl group. In the case of carbohydrates, the anomeric carbon is typically the carbon atom that was involved in the carbonyl group of the parent aldehyde or ketone prior to the formation of the cyclic hemiacetal or hemiketal.

The anomeric carbon is important in carbohydrate chemistry because it is often involved in glycosidic bond formation, which is how carbohydrates are linked together to form larger structures like polysaccharides. The configuration of the anomeric carbon (alpha or beta) also affects the physical and chemical properties of carbohydrates, including their solubility, reactivity, and biological activity.

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21) The molecular weight of urea ((NH2)2CO), a compound used as a nitrogen fertilizer, is ________ amu (rounded to one decimal place).A) 44.0B) 43.0C) 60.1D) 8.0E) 32.0

Answers

The molecular weight of urea ((NH2)2CO), a compound used as a nitrogen fertilizer, is 60.1 amu.

The correct option is :- C



Urea consists of:

2 Nitrogen (N) atoms: each with an atomic weight of 14.0 amu
4 Hydrogen (H) atoms: each with an atomic weight of 1.0 amu
1 Carbon (C) atom: with an atomic weight of 12.0 amu
1 Oxygen (O) atom: with an atomic weight of 16.0 amu

Step-by-step calculation:
The weight of Nitrogen atoms: 2 x 14.0 = 28.0 amu
The weight of Hydrogen atoms: 4 x 1.0 = 4.0 amu
The weights of Carbon and Oxygen atoms: 12.0 + 16.0 = 28.0 amu
Sum the weights of all elements: 28.0 (N) + 4.0 (H) + 28.0 (C+O) = 60.0 amu

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A 0.100 m solution of which one of the following solutes will have the lowest vapor pressure?
a. sucrose
b. Al(ClO4)3
c. NaCl
d. KClO4
e. Ca(ClO4)2

Answers

To determine which 0.100 m solution will have the lowest vapor pressure, we need to consider the number of solute particles each substance will produce when dissolved in water. The more solute particles present, the lower the vapor pressure.

a. Sucrose: Since it is a non-electrolyte, it will not dissociate in water. Number of particles produced = 1.

b. Al(ClO₄)₃: When dissolved, it will dissociate into 1 Al³⁺ ion and 3 ClO₄⁻ ions. Number of particles produced = 1 + 3 = 4.

c. NaCl: When dissolved, it will dissociate into 1 Na⁺ ion and 1 Cl⁻ ion. Number of particles produced = 1 + 1 = 2.

d. KClO₄: When dissolved, it will dissociate into 1 K⁺ ion and 1 ClO₄⁻ ion. Number of particles produced = 1 + 1 = 2.

e. Ca(ClO₄)₂: When dissolved, it will dissociate into 1 Ca²⁺ ion and 2 ClO₄⁻ ions. Number of particles produced = 1 + 2 = 3.

The 0.100 m solution of Al(ClO₄)₃ (option b) will have the lowest vapor pressure, as it produces the highest number of solute particles (4) when dissolved in water.

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30) Write the formula for the compound formed between rubidium and sulfur.A) RbSB) RbS2C) Rb2SD) Rb2SO3E) Rb3S2

Answers

The formula for the compound formed between rubidium (Rb) and sulfur (S) is Rb2S. So, the correct answer is C) Rb2S.

This is because rubidium has a +1 charge, and sulfur has a -2 charge. To balance the charges, you need two rubidium atoms for every sulfur atom. So, the correct answer is C) Rb2S.

Chemical compounds are formed when elements combine with each other by exchanging or sharing electrons.

In the case of rubidium and sulfur, rubidium is an alkali metal that readily loses its single valence electron to achieve a stable electron configuration, and sulfur is a non-metal that tends to gain two electrons to form a stable octet.

When rubidium (Rb) reacts with sulfur (S), the electron transfer results in the formation of an ionic compound, where rubidium forms a cation (+1 charge) and sulfur forms an anion (-2 charge).

To balance the charges in the compound, the number of cations and anions must be equal, and the total positive charge must equal the total negative charge.

In this case, since rubidium has a +1 charge and sulfur has a -2 charge, two rubidium atoms are required to balance the charge of one sulfur atom. Therefore, the correct formula for the compound formed between rubidium and sulfur is Rb2S, as it contains two Rb+ ions for every S2- ion.

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What binds to an anion exchange colomn

Answers

An anion exchange column binds to negatively charged ions or anions. This can include ions such as chloride (Cl-), sulfate (SO42-), and phosphate (PO43-). It  is a type of chromatography column that binds negatively charged ions, or anions. In an anion exchange column, the stationary phase consists of positively charged functional groups, which attract and bind to the anions present in the sample.

The column is designed to attract and retain these anions, while allowing other molecules or ions to pass through. This property makes anion exchange columns useful for purifying or separating molecules that contain negatively charged functional groups, such as proteins or nucleic acids.

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The Curiosity Rover on the surface of Mars recently measured a daily low temperature of -65.19 degrees C. What is implied range of the actual temperature?

Answers

The implied range of the actual temperature on Mars is approximately between -65.19 degrees Celsius (daily low) and -15.19 degrees Celsius (estimated daily high).

To determine the implied range of the actual temperature on Mars with the given daily low of -65.19 degrees Celsius, we can consider the possible daily temperature fluctuations.
Step 1: Identify the given temperature


The Curiosity Rover measured a daily low temperature of -65.19 degrees C.
Step 2: Estimate the possible range of temperature fluctuation
On Mars, the temperature can vary greatly, with fluctuations of about 50 degrees Celsius between the daily low and high.

Step 3: Calculate the implied range of the actual temperature
To find the possible high temperature, add the estimated fluctuation (50 degrees) to the given low temperature (-65.19 degrees):

-65.19 + 50 = -15.19 degrees Celsius

Thus, the implied range of the actual temperature on Mars is approximately between -65.19 degrees Celsius (daily low) and -15.19 degrees Celsius (estimated daily high).

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If radiation hits me that has more energy than required to emit an electron, what happens to the additional energy?

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The photon will absorb the remaining energy because its frequency and wavelength match the extra energy.

What is radiation?

The term radiation refers to energy which could be ionizing in nature. It consists of high frequency photons that move at the speed of light.

If radiation hits you that has more energy than required to emit an electron, the additional energy will be transferred to the emitted electron as kinetic energy.

This means that the electron will be emitted with a higher velocity (or speed) than if it had just enough energy to be emitted, but the electron itself will not gain any additional energy beyond that. The remaining energy will be carried away by the photon as its frequency and wavelength will correspond to the excess energy.

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What is a common non-repetitive irregularity found in anti-parallel beta sheets? where does it occur?

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A common non-repetitive irregularity found in anti-parallel beta sheets is known as a beta bulge. It occurs when there is a local distortion in the beta-sheet caused by a small number of amino acid residues that deviate from the normal hydrogen bonding pattern.

This deviation causes a slight kink or bends in the beta sheet, resulting in a bulge in the structure. Beta bulges are often caused by the presence of amino acids with bulky side chains or those that cannot form hydrogen bonds as expected.

They are found in various proteins, including enzymes and structural proteins, and can have functional implications. For example, beta bulges can help to stabilize protein structures, create binding sites for ligands or substrates, or facilitate protein-protein interactions.

The study of beta bulges is important in understanding protein structure and function, and their role in disease states.

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43) How many grams of calcium phosphate are theoretically produced if we start with 3.40 moles of Ca(NO3)2 and 2.40 moles of Li3PO4?
Reaction: 3Ca(NO3)2 + 2Li3PO4 → 6LiNO3 + Ca3(PO4)2
A) 310
B) 248
C) 1054
D) 351
E) not enough information

Answers

Rounding to the nearest gram, the answer is A) 310.

The balanced chemical equation is:

[tex]3Ca(NO_{3} )_{2}[/tex] + 2 Li3PO4 -> 6 LiNO3 + Ca3(PO4)2

The stoichiometry of the reaction shows that 3 moles of [tex]Ca(NO_{3} )_{2}[/tex]  react with 2 moles of Li3PO4 to produce 1 mole of Ca3(PO4)2.

Given that 3.40 moles of [tex]Ca(NO_{3} )_{2}[/tex]  and 2.40 moles of Li3PO4 are present, we can use the stoichiometry of the reaction to determine which reactant is limiting:

For [tex]Ca(NO_{3} )_{2}[/tex] : 3.40 moles [tex]Ca(NO_{3} )_{2}[/tex] x (1 mole Ca3(PO4)2 / 3 moles [tex]Ca(NO_{3} )_{2}[/tex] = 1.13 moles Ca3(PO4)2

For Li3PO4: 2.40 moles Li3PO4 x (1 mole Ca3(PO4)2 / 2 moles Li3PO4) = 1.20 moles Ca3(PO4)2

Since Li3PO4 produces more moles of Ca3(PO4)2 than [tex]Ca(NO_{3} )_{2}[/tex]  it is the limiting reactant. Therefore, the maximum amount of Ca3(PO4)2 that can be produced is 1.20 moles.

The molar mass of Ca3(PO4)2 is 310.18 g/mol. Therefore, the theoretical yield of Ca3(PO4)2 is:

1.20 moles x 310.18 g/mol = 372.216 g

Rounding to the nearest gram, the answer is A) 310.

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The BLU-113A/B serves as the warhead for the a. GBU-32. b. CBU-107. c. GBU-15(V)1/B. d. GBU-28A/B and B/B.

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The BLU-113A/B serves as the warhead for the GBU-28A/B and B/B. It is a penetrator bomb designed to penetrate hardened targets, such as underground bunkers and tunnels. The GBU-32 uses a different type of warhead, the BLU-109, which is also designed for penetrating targets.

The CBU-107 is a cluster bomb that disperses smaller bomblets, while the GBU-15(V)1/B is a guided bomb with a different type of warhead.

The BLU-109/B bomb is constructed with a thick, high-strength steel casing that enables it to withstand the extreme forces that occur during impact. The bomb typically features fins or wings that provide stability during flight and help guide it towards the intended target. When the bomb is released, it freefalls towards the target until it reaches the desired altitude, at which point the guidance system activates and steers the bomb towards the target.

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