Describing Enthalpy Changes
What term describes the overall energy change in
the substance portrayed in the graph at right?
endothermic
exothermic
Temperature vs. Heat Added
120
st
100
80
Temperature,
degrees
Celsius
60
40
20
A
-20 +
B
50
Heat added, kJ
E
100

Answer:

Explanation:

The volume of a balloon is 30 L at 313K and a pressure of 153KPA What is the volume at 273K and 101.3kPa?

from PV=nRT we can derive

PV/T =P'V'/T' so

153X30/313 = 101.3 X V'/273

OR 153 X 30 X273/(313 X 101.3) =V'

V' = 39.5 L

Answer:

The actual sequence of steps which describe the life cycle of a lake is given below:

C. Runoff fills a depression - sediments build up

- water rises continuously

Explanation:

This is because, the water which builds up as a result of the runoff water accumulating on the depression helps towards building up. When it must have accumulated greatly, it ends up forming a lake.

Answer:

Physical

Explanation:

When a substance changes from liquid to gas it's a physical change. There is no chemical reaction between the rubbing alcohol or anything else that would change it's chemical composition.

The total internal energy in the container is 329.77 Btu and the enthalpy in the container is 385.14 Btu.

Using the steam tables, we can determine the specific volume of water at the given pressure and temperature. The specific volume of water is 0.01658 \(ft^3/lbm\).

The mass of water in the container is 0.92 lbm, so the total volume of the water is:

V = m/v = 0.92 lbm / 0.01658 \(ft^3/lbm\)  = \(55.539 ft^3\)

Assuming the water is at saturation, we can find the total internal energy and enthalpy by using the values in the steam tables for saturated water at 100 psia.

From the steam tables, the total internal energy of saturated water at 100 psia is 358.05 Btu/lbm, so the total internal energy in the container is:

U = m * u = 0.92 lbm * 358.05 Btu/lbm = 329.77 Btu

From the steam tables, the enthalpy of saturated water at 100 psia is 419.02 Btu/lbm, so the enthalpy in the container is:

H = m * h = 0.92 lbm * 419.02 Btu/lbm = 385.14 Btu

Therefore, the total internal energy in the container is 329.77 Btu and the enthalpy in the container is 385.14 Btu.

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Answer:

8,95

Explanation:

Density is equal to mass/volume

\(D=\frac{m}{v} \\D= \frac{1668g}{186.2} \\D = \frac{8,95g}{cm^3} \\\)

approximately

Curiosity:

Did you knew that is because of his low density that ships can fluctuate?

Despite their big mass, their volume are far greatter, so the Buoyancy Force acts heavily on them.

The formula for a molecular formed form N and Cl would be N\(Cl_{3}\).

According to the given configuration of Nitrogen(N) and Chlorine(Cl) we have,

N needs 3 electrons and Cl needs 1 electron to complete their octet.

Therefore, one atom of N will combine with three atoms of Cl.

So the molecular formula of the compound formed will be N\(Cl_{3}\).

The addition reaction is:

    N    +     Cl     ------->    N\(Cl_{3}\)

(nitrogen)   (chlorine)     ( Nitrogen(III) chloride)

Therefore the formula for a molecule formed from N and Cl would be N\(Cl_{3}\).

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Answer:

500g Ika= 10.85 mol 500g (46.0699) - 10.35 mol - 3.00m - 13.62 kq 5.

Explanation:

Does this help?

A 3.00 M solution of \(C_2H_5OH\) would be prepared by dissolving 0.500 kg of  \(C_2H_5OH\) in 3.62 kg of water.

0.500 kg  \(C_2H_5OH\) is equivalent to (mole = mass/molar mass):

      500g/46.07 = 10.85 moles of  \(C_2H_5OH\)

3.00 M solution of  \(C_2H_5OH\) can be prepared by dissolving 10.85 moles in (molarity = moles/volume):

                      10.85/3 = 3.62 Liters of water

3.62 liters of water weighs (density = mass/volume);

              1 x 3.62 = 3.62 kg

Thus, 3.62 kg of water will be required to prepare the solution.

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Answer:

the mass is zero i think im not sure but yeah

Explanation:

Answer:

37.1g of HCl

Explanation:

rate as brainliest

The answer is not 1 mol. There are 0.012 mol of acetone in the mixture. Expressed as a decimal, this is 0.012 mol.

To calculate the moles of acetone in the mixture, we need to use the formula:

moles = concentration x volume

First, let's calculate the moles of acetone in the original 2.0 mL of 6.0 M solution:

moles = 6.0 M x 0.0020 L = 0.012 mol

Next, we need to consider the dilution that occurs when the acetone solution is mixed with the HCl solution and water. To do this, we can use the equation:

M1V1 = M2V2

where M1 and V1 are the initial concentration and volume of acetone, and M2 and V2 are the final concentration and volume after dilution.

Solving for M2, we get:

M2 = M1V1/V2

M1 = 6.0 M
V1 = 0.0020 L
V2 = 0.0020 L + 0.0080 L + 0.010 L = 0.020 L

M2 = (6.0 M x 0.0020 L) / 0.020 L = 0.60 M

So the final concentration of acetone in the mixture is 0.60 M. To calculate the moles of acetone in the mixture, we use the same formula as before:

moles = concentration x volume

moles = 0.60 M x 0.020 L = 0.012 mol

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Considering only specific heat, Lead would be the most ideal for use in cookware.

The amount of heat needed to raise a substance's temperature by one degree Celsius in one gram is known as its specific heat. Typically, calories or joules per gram per degree Celsius are used as the units of specific heat.

Lead would be the material best suitable for use in cookware if only particular heat were taken into account.

Lead, however, is too hazardous and hefty in comparison to the other possibilities.

Aluminum or iron would create the best cookware, therefore these materials may be the best overall options.

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Answer:

its lead

Explanation:

insane ik

Answer:

Explanation:

1,2,1

Answer:

here's the answer

Explanation:

Answer:

false, it is theory of how the universe started

Answer:

it's answer is false you can write it

When recrystallizing a solid, the amount of hot solvent required to dissolve the compound depends on various factors such as the solubility of the compound and the desired concentration.

Generally, you should use just enough hot solvent to dissolve the compound completely. This typically ranges from the minimum amount required to dissolve the compound to a little less than that.

It is important to note that adding too much solvent can lead to lower yields and impurities in the recrystallized solid.

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Answer:

Hydrogen may be used in fuel cells for local electricity generation or potentially as a transportation fuel. Hydrogen is produced as a by-product of industrial chlorine production by electrolysis.

Answer:

1). 1 litre

2).12 cm

Explanation:

In 1 litre = 1000 ml whereas 1500 milliliters equals 0.15 litres and it is same for 12 cm and 12 milliliters

Answer:

Grams of chlorine gas to moles

The SI base unit for amount of substance is the mole. 1 grams Chlorine is equal to 0.028206357713029 mole.

Explanation:

meaning:An acid is a chemical substance, usually a liquid, which contains hydrogen and can react with other substances to form salts. Some acids burn or dissolve other substances that they come into contact with.

Answer:

Given that we want to prepare a 10% solution of sodium hydroxide in 200 mL, we need to calculate the mass of sodium hydroxide required to make this solution.

We can use the following formula to calculate the mass of solute required to make a given volume and concentration of solution:

The density of solid NaOH is 2.13 g/mL. So, the density of sodium hydroxide solution is:

Sodium hydroxide, also known as lye and caustic soda or caustic soda, is an inorganic compound with the chemical formula NaOH. This compound is an ionic compound in the form of a white solid composed of the sodium cation Na⁺ and the hydroxide anion OH⁻. Sodium hydroxide is a building block that can also be found in detergents and oil stain removers. We use it to make products clean better by influencing the formula molecules, so they work better together.

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Iodine's electron domain shape in this molecule is square pyramidal because it is 57.2% of the mass of an unidentified molecule that just includes iodine and fluorine.

Whether they are bonding or non-bonding electrons, the pair/group/domain of electrons on the Centre atom is known as the electron geometry. Electron pairings are electrons that can be found as solitary pairs, bonds, or as a single unpaired electron.

Let's say the chemical formula is Molecular weight of the molecule expressed in Fm Iodine weight percentage equals 126.9 n /(126.9 n + 19m) = 0.527 when M =n* atomic weight of iodine + m* atomic weight of fluorine.

this results in m=5n taking into account n=1 and m=5, leading to the molecular formula = IF5 molecular structure.

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Nitrogen fixation is a process that makes nitrogen available to plants and is carried out by  microorganisms.  specifically bacteria and some archaea.

Nitrogen fixation is a biological process that converts atmospheric nitrogen gas (N₂) into a form that can be utilized by plants and other organisms. This conversion is necessary because atmospheric nitrogen is relatively inert and cannot be directly utilized by most organisms.

The process of nitrogen fixation is primarily carried out by certain microorganisms, specifically bacteria and some archaea. These nitrogen-fixing microorganisms possess enzymes called nitrogenases, which enable them to convert atmospheric nitrogen into ammonia (NH₃) or ammonium (NH₄⁺). This conversion occurs in specialized structures called nodules, which are typically found in the roots of leguminous plants, such as beans, peas, and clover.

The nitrogen-fixing microorganisms establish a symbiotic relationship with the host plants. They receive carbohydrates from the plants while providing them with a source of nitrogen in the form of ammonia or ammonium. This process is vital for enriching the soil with nitrogen and ensuring the availability of this essential nutrient for plant growth and development.

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Complete question:

nitrogen fixation is a process that makes nitrogen available to plants and is carried out by ____

Answer:

synthetic products can be helpful to the environment in many ways like:

Explanation:

can help in conserving resources

can reduce pollution

can help in producing environment friendly resources

can recycle products

Answer:

all are metals and they will form oxide in air

To prepare a buffer solution of pH = 10.54, the relative masses of dimethyl amine and dimethyl ammonium chloride needed are 0.079 g and 0.067 g respectively.

A buffer solution is a solution that has the ability to resist changes in pH upon the addition of small amounts of acid or base. A buffer solution contains a weak acid and its conjugate base or a weak base and its conjugate acid. It can be prepared by mixing equal volumes of a weak acid and its conjugate base or a weak base and its conjugate acid.

Dimethyl amine is an organic compound with the formula (CH3)2NH. It is a weak base and can act as a proton acceptor. Dimethyl ammonium chloride is an organic compound with the formula (CH3)2NH2Cl. It is a salt of a weak base and a strong acid and can act as a proton donor.

Calculation of relative masses:

The pKa of dimethyl amine is 10.73.

To prepare a buffer solution of pH = 10.54,

the ratio of [A-]/[HA] should be 1/9.

Using the Henderson-Hasselbalch equation;

pH = pKa + log([A-]/[HA])10.54 = 10.73 + log([A-]/[HA])

log([A-]/[HA]) = -0.19[A-]/[HA] = 0.67/1.00

The sum of the masses of dimethyl amine and dimethyl ammonium chloride is 0.146 g. The ratio of their masses is 0.67:1.00.

So, the relative masses of dimethyl amine and dimethyl ammonium chloride needed are 0.079 g and 0.067 g respectively.

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Answer:

D would be the best answer

Explanation:

Among the given options example of force acting between two objects is gravity by which an object attracts other objects into its center of mass.

Force is an external agent acting on a body to change it state or motion or rest or to deform it. There are different kinds of forces such as, gravitational force, frictional force, nuclear , magnetic force etc.

Gravitational force is the force by which an object attracts other objects into its center of mass. Earth attracts every objects on its surface into it. This effect is called gravity.

Force of gravitation depends on the mass of both objects and distance between them. Greater the mass, greater will be the force of gravity exerted on it. Thus, option D is correct.

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2, 4-dimethylpentane is the saturated hydrocarbon.

A saturated hydrocarbon is a hydrocarbon that contains only single bonds.

Of the compounds listed, the only one that meets this criteria is 2, 4-dimethylpentane.

All of the other compounds contain at least one double or triple bond, which disqualifies them from being classified as saturated hydrocarbons.

2, 4-dimethylpentane is a straight-chain hydrocarbon that consists of 5 carbons with 8 hydrogens. It is an alkane, meaning it has only single bonds between its carbon atoms, with the formula C5H12.

The "dimethyl" in its name refers to the two methyl groups that are attached to the second and fourth carbons.

2-octene is a hydrocarbon with 8 carbons and 14 hydrogens. It has a double bond between the second and third carbon atoms, which means it cannot be classified as a saturated hydrocarbon. Its formula is C8H14.

Bromobenzene is an aromatic hydrocarbon with the formula C6H5Br. It has a ring of 6 carbon atoms with a single bromine atom attached to one of the carbons.

Aromatic compounds have special chemical properties that disqualify them from being considered saturated hydrocarbons.

Cyclohexene is an alkene with the formula C6H10. It has 6 carbons and 10 hydrogens, with a double bond between the second and third carbon atoms.

Alkenes have at least one double bond, which means cyclohexene cannot be classified as a saturated hydrocarbon.

1-pentyne is an alkyne with the formula C5H6. It has 5 carbons and 6 hydrogens, with a triple bond between the first and second carbon atoms. Alkynes contain at least one triple bond, so 1-pentyne is not a saturated hydrocarbon.

In conclusion, the only saturated hydrocarbon among the compounds listed is 2, 4-dimethylpentane. All the other compounds contain at least one double or triple bond.

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Answer:

B

Explanation:

production ca3(PO4)2

4x2=8

We need to make a lucite sleeve with a thickness of at least 1.29 mm to prevent beta particles from passing through.

To calculate the required thickness of the lucite sleeve, we need to consider the stopping power of the material. Beta particles are electrons that can be stopped by materials with high electron density, such as lucite.

First, we need to calculate the range of the beta particles in the glass wall of the syringe. We can use a range-energy relationship to estimate the range:

R = 0.412 * Emax^1.65

Where R is the range in g/cm2, and Emax is the maximum energy of the beta particles in MeV. For 90Sr, the maximum energy is 2.28 MeV.

R = 0.412 * 2.28^1.65
R = 0.412 * 7.07
R = 2.91 g/cm2

Next, we need to calculate the thickness of lucite required to stop the beta particles. We can use the concept of range straggling to estimate the thickness:

d = 1.96 * Rho * R / (Z * Z * dE/dx)

Where d is the thickness in cm, Rho is the density of the material in g/cm3, Z is the atomic number of the material, and dE/dx is the stopping power of the material in MeV/(g/cm2).

For lucite, Z is approximately 6, and dE/dx is 2.27 MeV/(g/cm2) for beta particles with energies between 0.5 and 3 MeV.

d = 1.96 * 1.2 * 2.91 / (6 * 6 * 2.27)
d = 0.129 cm = 1.29 mm

Therefore, we need to make a lucite sleeve with a thickness of at least 1.29 mm to prevent beta particles from passing through.

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There were approximately 24,000 more obese people in Evansville than in Boulder. is that we need to find the difference in the number of obese people between Evansville, IN-KY, and Boulder, CO.

According to the poll conducted by the Gallup Corporation in March, in Evansville, for every person who was not obese, there were 1.6 people who were. This means that the proportion of obese adults in Evansville was approximately 62.5%. On the other hand, in Boulder, for every obese person, there were 1.1 people who were not obese. This means that the proportion of obese adults in Boulder was approximately 47.6%.

Using these proportions and the estimated populations of Evansville (120,000) and Boulder (97,000), we can estimate the number of obese adults in each city. In Evansville, there were approximately 75,000 obese adults (120,000 x 0.625). In Boulder, there were approximately 46,000 obese adults (97,000 x 0.476).

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Answer:

b is your answer...........