the heat of vaporization of acetonitrile is . calculate the change in entropy when of acetonitrile condenses at . be sure your answer contains a unit symbol. round your answer to significant digits.

Your answer is: ionic character

The greater electronegativity difference between two atoms bonded together, the greater the bond's percentage of ionic character.

Electronegativity is a chemical property that describes the tendency of an atom or a functional group to attract electrons toward itself.

The electronegativity of an atom is affected by both its atomic number and the distance that its valence electrons reside from the charged nuclei.

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The artistry in the scene of Wiesel and his father approaching the inferno is achieved by the use of literary techniques such as pacing and sentence structure.

The pace of the scene is quickened by the use of short sentence fragments, which creates a sense of urgency and intensity. This helps to convey the chaos and confusion of the situation, and the reader is drawn into the scene, feeling as though they are there with Wiesel and his father.

The use of sentence fragments also contributes to the overall sense of disorientation and discomfort, as it breaks away from traditional sentence structure and grammar. This contributes to the vividness of the scene and makes it more memorable for the reader.

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Answer:

big ablsolty long pp

Explanation:

dong

Answer:

There are 4 significant figures.

Explanation:

The significant figures are underlined :

0 . 0 9 0 5 0

Answer:

Group 2A (or IIA) of the periodic table are the alkaline earth metals: beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). They are harder and less reactive than the alkali metals of Group 1A.

Explanation:

Answer:

Wildfires

Explanation:

Therefore, the value of Ka for this solution of monoprotic acid is 3.9 x 10^-5.

The Ka of a monoprotic acid is the acid dissociation constant, which is a measure of its strength. It tells us how much of the acid will dissociate into its conjugate base and hydrogen ions when it is dissolved in water. The expression for Ka is:

Ka = [H+][A-]/[HA]

where [H+] is the concentration of hydrogen ions, [A-] is the concentration of the conjugate base, and [HA] is the concentration of the undissociated acid.

We are given that the acid in question is monoprotic, meaning it can donate only one proton (H+) to the solution. We are also given that the solution has a concentration of 1.04 m, which means that the total concentration of the acid is 1.04 M.

We are also given that 4.66% of the acid is ionized, which means that 4.66% of the acid has dissociated into its conjugate base and hydrogen ions. This also means that 95.34% of the acid remains undissociated.

Let x be the concentration of hydrogen ions and [A-] in the solution, and let 1.04-x be the concentration of undissociated acid. Then we can set up the following equilibrium expression:

Ka = x^2/(1.04-x)

We can solve for x by plugging in the given value of Ka and the known value of the percent ionization:

4.66/100 = x^2/(1.04-x)

Simplifying this equation and solving for x, we get:

x = 0.0633 M

Now we can use this value of x to calculate Ka:

Ka = x^2/(1.04-x) = (0.0633)^2/(1.04-0.0633) = 3.9 x 10^-5

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Answer:

Length are measured in cm.

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Answer:

Rutherford concluded that these particles were striking... a tiny region of positive charge. Rutherford called the region that deflected alpha particles... a nucleus. The total volume of the nucleus of an atom is... very small compared with the rest of the atom. Except for in the simplist type fo hydrogen atom, all nuclei consist of...

Explanation:

Answer:

a; increasing fraction

Explanation:

To calculate the volume of a gas, use the ideal gas law equation, PV = nRT.

Where:

P = pressure of the gas (in units of pressure, such as atm)

V = volume of the gas (in units of volume, such as liters)

n = number of moles of the gas

R = ideal gas constant (0.0821 L·atm/(mol·K) or 8.314 J/(mol·K))

T = temperature of the gas (in units of temperature, such as Kelvin)

It is important to note that the expression to calculate the volume of the gas would depend on the specific conditions (pressure and temperature) under which the balloon is being measured.

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Scientists at NatureWorks of Minnetonka, Minnesota, makes food containers from a polymer called polylactic acid, made using microorganisms to convert cornstarch into a resin. The resulting polymer is used to replace rigid petroleum-based plastic used in yogurt containers and water bottles.

The most abundant component of the atmospheres of Uranus and Neptune is methane, which is represented by the chemical formula CH4.

Uranus and Neptune are known as ice giants and their atmospheres are primarily composed of hydrogen and helium. However, methane is the most abundant component after hydrogen and helium. Methane makes up about 2.3% of Uranus' atmosphere and about 1.5% of Neptune's atmosphere. The presence of methane gives these planets their characteristic blue color as it absorbs red light and reflects blue light. The remaining components of the atmospheres of Uranus and Neptune are made up of trace amounts of ammonia, water vapor, and other gases.

In conclusion, the most abundant component of the atmospheres of Uranus and Neptune is methane, which is responsible for their distinctive blue color. While hydrogen and helium are the primary components of their atmospheres, methane makes up a significant percentage and is essential in understanding the composition and characteristics of these ice giants.

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Answer:

This glossary of chemistry terms is a list of terms and definitions relevant to chemistry, including chemical laws, diagrams and formulae, laboratory tools, glassware, and equipment. Chemistry is a physical science concerned with the composition, structure, and properties of matter, as well as the changes it undergoes during chemical reactions; it features an extensive vocabulary and a significant amount of jargon

Answer:

Nitrogen is N2

Oxygen is O2

Carbon dioxide is CO2

The molar concentration of CO2 in a 4.26 L sample of acid rain is 0.0081 mol/L.Acid rain is caused by air pollution.

The molar concentration of carbon dioxide in a 4.26L sample of acid rain is calculated as follows:First, we will calculate the number of moles of carbon dioxide in the sample. The formula to calculate the number of moles is:Number of moles = mass of the substance/molar mass of the substanceThe molar mass of CO2 is 44.01 g/mol. 355 ppm means 355 parts per million, which is equivalent to 355 mg/L.To calculate the mass of carbon dioxide in 4.26 L of acid rain:Mass of CO2 = Volume × ConcentrationMass of CO2 = 4.26 L × 355 mg/L = 1510.3 mg = 1.51 gTherefore, the number of moles of CO2 in the sample is:Number of moles of CO2 = Mass of CO2/Molar mass of CO2 = 1.51 g/44.01 g/mol = 0.0344 molTo calculate the molar concentration of CO2:Molar concentration of CO2 = Number of moles of CO2/Volume of solution in litersMolar concentration of CO2 = 0.0344 mol/4.26 L = 0.0081 mol/L, When sulfur dioxide and nitrogen oxide pollutants combine with atmospheric moisture, they form acidic compounds that can travel long distances and fall as acid rain. Acid rain can damage forests, kill fish in streams, and corrode buildings and monuments, among other things.

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Invented by Bernard Launy and Jeremie Metz, flaws in the system in terms of energy inputs and outputs is the overbalanced wheel in which spokes are attached

Energy is the ability to do work to cause changes in matter

The overbalanced wheel perpetual motion machine is one of the most commonly proposed perpetual motion machine designed and wheel is designed to turn clockwise just after the weighted spoke reaches the top of the wheel and the spoke flip outward to the right exerting the force downward toward the ground and some energy will be lost from friction as the mechanism rub on the inner spoke and more energy will be lost when it transferred into sound and thermal energy

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If we view a new moon tonight, 4 weeks will pass before we view a full moon. The sole natural satellite of Earth is the Moon.

The sole natural satellite of Earth is the Moon. With a diameter that is around one-fourth that of the Earth, it's the fifth biggest satellite inside the solar system as well as the largest and also most massive when compared to its parent planet. The Moon is larger than any other dwarf planets of a Solar System and belongs to a planetary-mass body with a distinct rocky body, rendering this a satellite planet according to geophysical interpretations of the term.

There isn't much of an atmosphere, hydrosphere, and magnetic field there. With a surface gravity of 0.1654 g, it has a gravity that is around one-sixth that of Earth. Jupiter's moon Io is the only satellite inside the Solar System that is documented to have a higher gravity and density. If we view a new moon tonight, 4 weeks will pass before we view a full moon.

Therefore,  if we view a new moon tonight, 4 weeks will pass before we view a full moon.

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Answer:

VSEPR molecular shapes are the substances from the laboratory operation that have more than one central atom.

Explanation:

Molecular shapes from VSEPR

Explanation:

The reason is VSEPR theory, it considers electrons, involved in bond formation as the key part. The pairs of electrons around a central atom, they may be in  sigma bonds, pi bonds, or lone pairs, are always in proximity with the positive nucleus and  as far as possible from each other. Therefore, only the lone pairs on the central atom are taken into consideration when predicting molecular shape.

H2O2 , C2O4,  CH3OH, CH3NH2

substances from the lab activity have more than one central atom

Therefore, 48.55 g of sodium chlorate would produce 15.6 L of O2 gas at STP.

it is because NaClO3 and oxygen have a mole ratio of 2 to 3. Then, you must receive [12  2 then  3] = 18 moles of O2 from 12 moles of NaClO3. You have discovered the quantity of O2 molecules (n). Keep in mind that number of moles (n) equals material mass (m) minus molar mass. (M).

For the breakdown of NaClO3, the equilibrium chemical equation is:

2 NaClO3(s) → 2 NaCl(s) + 3 O2(g)

48.55 g NaClO3 × (1 mol NaClO3/106.44 g NaClO3) = 0.4560 mol NaClO3

Now we can determine the molecules of O2 produced using the mole ratio from the balanced equation:

0.4560 mol NaClO3 × (3 mol O2/2 mol NaClO3) = 0.6840 mol O2

V = nRT/P

We can substitute the numbers and find V by using the standard temperature and pressure (STP), which are 0 °C (273 K) and 1 atm, respectively.

V = (0.6840 mol)(0.08206 L·atm/mol·K)(273 K)/(1 atm) = 15.6 L

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Answer:

The answer is A. Unlike other maps, topographic maps indicate man-made and natural landforms.

Explanation: Took the test and got 100% Edg. 2020

Answer:

A)Unlike other maps, topographic maps indicate man-made and natural landforms.

Explanation:

A particular medication dosage is 45.0 mg/kg of body weight. The mg of the medication should a child weighing 47.3 lbs. receive is 965.25 mg of the medication.

To find the correct dosage of medication for a child weighing 47.3 lbs, we need to convert the child's weight from pounds to kilograms and then multiply by the dosage amount.

Step 1: Convert the child's weight from pounds to kilograms.
1 kg = 2.20462 lbs
47.3 lbs ÷ 2.20462 = 21.45 kg
Step 2: Multiply the child's weight in kilograms by the dosage amount.
21.45 kg × 45.0 mg/kg = 965.25 mg
Therefore, the child should receive 965.25 mg of the medication.

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To make an E9 mixture 8657.14 gal of E7 should be mixed with 3000 gal of E10

Given to us is the amount of ethanol in the E10 mixture is 10% of 3000 gallons:

Ethanol in E10 = 10% × 3000 gal = 0.10 × 3000 gal = 300 gal

To solve this problem, we can set up an equation based on the amount of ethanol in each mixture.

Let x represent the amount of E7 mixture (in gallons) that needs to be added to the E10 mixture to obtain the desired E9 mixture.

The amount of ethanol in the E7 mixture is 7% of x gallons:

Ethanol in E7 = 7% ×  gal = 0.07 × gal

The resulting E9 mixture will contain 9% ethanol of the total volume of 3000 + x gallons:

Ethanol in E9 = 9% × (3000 + x) gal = 0.09 × (3000 + x) gal

According to the problem, the resulting E9 mixture contains 906 gallons of ethanol:

Ethanol in E9 = 906 gal

Now we can set up the equation:

Ethanol in E10 + Ethanol in E7 = Ethanol in E9

300 gal + 0.07x gal = 906 gal

Subtracting 300 gal from both sides:

0.07x gal = 606 gal

Dividing both sides by 0.07:

x = 606 gal / 0.07

x = 8657.14

Therefore, approximately 8657.14 gallons of E7 mixture should be mixed with 3000 gallons of E10 to make an E9 mixture.

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Complete question: Ethanol fuel mixtures have "E" numbers that indicate the percentage of ethanol in the mixture by volume. For example, E10 is a mixture of 10% ethanol and 90% gasoline. How much E7 should be mixed with 3000 gal of E10 to make an E9 mixture?

\(molecular \: formula \: = C_{14}H_{18}N_{2}O_{5} \\ \)

\(molar \: mass = 294\: g.mol {}^{ - 1} \)

\(n_{aspartame} = \frac{mass}{molar \: mass} = \frac{4 \times 10 {}^{ - 3} }{294} = 1.36055 \times 10 {}^{ - 5} moles \\ \)

\(1 \: mole \: asp = 18 \: moles \: hydrogen \\ n_{hydrogen} = 18 \times n_{aspartame}\)

\(atoms_{hydrogen} = n_{hydrogen} \times 6.022 \times 10 {}^{23} \\ atoms_{hydrogen} = 0.0002448979591 \times 6.022 \times 10 {}^{23} \\ atoms_{hydrogen} = 1.4747755 \times 10 {}^{20} atoms\)

Answer:

C₅H₁₂ + 8O₂ → 5CO₂ + 6H₂O

Explanation:

Let's start by counting how many molecules we have on each side.

Reactants

C - 5

H - 12

O - 2

Products

C - 1

O - 3

H - 2

We have to balance both sides. Since we have 5 carbon atoms on the reactants side and 1 carbon atom on the products side, we'll start with that. Write 5 as the coefficient for CO₂ to balance the carbons.

C₅H₁₂ + O₂ → 5CO₂ + H₂O

Now that the carbons are balanced, let's look at the hydrogens. There's 12 on the reactants side and 2 on the products side. To balance the hydrogens, we have to write 6 as the coefficient for H₂O.

C₅H₁₂ + O₂ → 5CO₂ + 6H₂O

Now the hydrogens are balanced. All that's left to do is balance the oxygens. Let's start by counting how many atoms we have on each side.

Reactants

C - 5

H - 12

O - 2

Products

C - 5

H - 12

O - 16

So, to balance the number of atoms on both sides, write 8 as the coefficient for O₂.

C₅H₁₂ + 8O₂ → 5CO₂ + 6H₂O

Lastly, let's check to make sure everything is balanced.

Reactants

C - 5

H - 12

O - 16

Products

C - 5

O - 16

H - 12

Both sides are balanced. Therefore, the balanced chemical equation is: C₅H₁₂ + 8O₂ → 5CO₂ + 6H₂O.

Hope that helps.

Answer:

\(\boxed{C_{5}H_{12} + 8O_{2} -->5CO_{2} + 6H_{2}O}\)

Explanation:

Part 1: Count the number of atoms on each side per element

To start, count the number of atoms per element on both sides of the equation.

Left Side

C - 5 atoms

H - 12 atoms

O - 2 atoms

Right Side

C - 1 atom

H - 2 atoms

O - 3 atoms

Part 2: Balance carbon atoms

Now, with this information, you can begin finding out how to properly balance both sides of the equation.

You need 5 carbon atoms on the left, so place a coefficient of 5 in front of the \(CO_{2}\) product. This will balance the carbons. Do not place a coefficient in front of the \(C_{5}H_{12}\) reactant - none are necessary!

Then, you can update your counts for your atoms.

Left Side

C - 5 atoms

H - 12 atoms

O - 2 atoms

Right Side

C - 5 atoms

H - 2 atoms

O - 11 atoms

The updated equation will look like this:

\(\boxed{C_{5}H_{12}+O_{2} --> 5CO_{2} + H_{2}O}\)

Part 3: Balance hydrogen atoms

Now, balance the hydrogen atoms. Place a coefficient of 6 in front of the \(H_{2}O\) product. This will balance the hydrogen atoms.

Once again, update the atom counts:

Left Side

C - 5 atoms

H - 12 atoms

O - 2 atoms

Right Side

C - 5 atoms

H - 12 atoms

O - 16 atoms

The updated equation will look like this:

\(\boxed{C_{5}H_{12} +O_{2}--> 5CO_{2} +6H_{2}O}\)

Part 4: Balance oxygen atoms

To fully balance the equation, place a coefficient of 8 in front of the \(O_{2}\) reactant. This will equalize the amount of oxygen atoms on both sides of the equation.

The updated equation will look like this:

\(\boxed{C_{5}H_{12} + 8O_{2} --> 5CO_{2} + 6H_{2}O}\)

Part 5: Check the equation and atom counts

Now, update the atom counts one last time to make sure they are equal.

Left Side

C - 5 atoms

H - 12 atoms

O - 16 atoms

Right Side

C - 5 atoms

H - 12 atoms

O - 6 atoms

They are equal, so you may proceed.

Part 6: Check if reductions are necessary

If the equations coefficients can all be divided by a common divisor (i.e., 3), follow up with that step. However, any equation that has a reactant or product without a coefficient, skip this step entirely.

This equation falls into that category, so you may proceed past it.

Your final equation will look like this: \(\boxed{C_{5}H_{12} + 8O_{2} -->5CO_{2} + 6H_{2}O}\)

Answer:

Outer planets are significantly colder than other planets! The answer is B.

Explanation:

The main difference between inner and outer planets is that inner planets have a high temperature compared to outer planets.

The molar concentration of the NaCl solution formed by dissolving 450.0 mg of NaCl in 100.0 mL of solution is 0.0770 mol/L.

To determine the molar concentration of a solution formed by dissolving 450.0 mg of NaCl (sodium chloride) in 100.0 mL of solution, we need to convert the mass of NaCl to moles and then calculate the molarity (mol/L).

First, we convert the mass of NaCl to grams:

Mass of NaCl = 450.0 mg = 450.0 mg × (1 g/1000 mg) = 0.450 g

Next, we calculate the number of moles of NaCl using its molar mass:

Molar mass of NaCl = 58.44 g/mol

Number of moles of NaCl = mass of NaCl / molar mass of NaCl

Number of moles of NaCl = 0.450 g / 58.44 g/mol = 0.00770 mol

Now, we can determine the molar concentration (Molarity) of the solution using the formula:

Molarity (M) = Number of moles / Volume of solution in liters

Volume of solution = 100.0 mL = 100.0 mL × (1 L/1000 mL) = 0.100 L

Molarity (M) = 0.00770 mol / 0.100 L = 0.0770 mol/L

Therefore, the molar concentration of the NaCl solution formed by dissolving 450.0 mg of NaCl in 100.0 mL of solution is 0.0770 mol/L.

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    This is not exactly a answer you can use but this is some information that you can use to find out the answer.

    You can usually confirm the charge associate degree particle unremarkably has by the element's position on the periodic table: The alkali metals (the IA elements) lose one negatron to create a ion with a 1+ charge. The alkaline-earth metal metals (IIA elements) lose 2 electrons to create a 2+ ion.

    Nonmetals type negative ions (anions). A range 7|chemical element|element|gas} atom should gain 3 electrons to possess an equivalent number of electrons as AN atom of the subsequent gas, neon. Thus, a gas atom can type AN ion with 3 additional electrons than protons and a charge of 3−.

Answer:  A.  1,1,1

Explanation:

The coefficients that will balance the equation; NH4OH(aq) →H2O(l) + NH3(g), is 1, 1, 1, because it proves the total number of atoms of each element on the LHS and RHS of the equation are equal, hence balanced.

LHS          RHS

N = 1            1

H = 5          5

O = 1            1