A 10.0 L balloon contains helium gas at a pressure of 655 mmHg. What is the final pressure, in millimeters of mercury, if the final volume is 13.8 L? Please show your work in order to receive credit.

Answer:

the youngest crust of the ocean floor can be found near the seafloor

Answer:

Positively Charged

Explanation:

The is a group XVI and period 4 element of the periodic table with similar physical and chemical to that of tellurium and sulfur. Selenium exist in different allotropic forms, which have different solubility including selenate, selenite and selenium in elemental form

The Se ion in selenate has a positive charge of +6, while the selenate ion has a charge of -2

The Se ion in selenite has a charge of +4, while the selenite ion has a negative charge of -2.

The charge of Se in elemental selenium is 0.

The decay rate, r, for the radioactive substance C-14 is approximately 0.00012102 per year.

The equation given is 0.5 = \(e^(-5730r)\), where 0.5 represents half of the initial amount, and e is the base of the natural logarithm.

To solve for r, we need to isolate it on one side of the equation. Taking the natural logarithm (ln) of both sides gives:

ln(0.5) = \(ln(e^(-5730r))\).

Using the property of logarithms that ln(\(e^x\)) = x, we simplify the equation to:

ln(0.5) = -5730r.

Now, we solve for r by dividing both sides by -5730:

r = ln(0.5) / -5730.

Using a calculator, we can evaluate the right side of the equation to find:

r ≈ -0.00012102 per year.

Rounding to five decimal places, the decay rate, r, for the radioactive substance C-14 is approximately 0.00012102 per year.

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The first step of the reaction, we have  reaction between a nucleophile and an electrophile.

We can see that in the first step of the reaction, we have  reaction between a nucleophile and an electrophile. In this case, the electrophile would have to be an alkyl halide which produces a carbocation as show in the image attached. What we have here is quite similar or  like most of the organic reactions, this reaction occurs in a number of detailed or smaller steps and each step of the reaction is going to help to bring us closer to the end product of the entire steps of the reaction which is wat we target as we carry out the particular reaction.The second step involves the reduction of the alkyne with the use of a Lindlar catalyst. As such the reaction is poisoned and it stops at the alkyne stage rather than going on to obtain the alkane.

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The best optimal wavelength at which to measure the absorbance of a set of given crystal violet solutions is 590 nm.

Crystal violet is a type of dye that is commonly used in laboratories to stain cells. It absorbs light most strongly at a wavelength of 590 nm, which is in the visible light spectrum. This is the best wavelength to use when measuring the absorbance of crystal violet solutions because it will provide the most accurate and reliable results.

To measure the absorbance of the crystal violet solutions, you will need a spectrophotometer. This is a device that measures the amount of light absorbed by a sample at a specific wavelength. First, you will need to calibrate the spectrophotometer using a blank solution. Then, you can measure the absorbance of each crystal violet solution at 590 nm by placing the solution in the spectrophotometer and recording the absorbance value.

By measuring the absorbance of the crystal violet solutions at the optimal wavelength of 590 nm, you can ensure that you are getting the most accurate and reliable results.

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It will take 0.02s to respond when the temperature suddenly changes.

Thermal diffusivity is significant because it can indicate the rate of thermal expansion of a substance. Lower heat diffusion rates are characterized by high values of thermal diffusivity. The material can therefore rapidly heat up or cool down. A higher heat diffusion rate results from a lower thermal diffusivity rating. As a result, it takes a long time for the material to heat up or cool down.

Thermal diffusivity is thus used to determine the best material to utilize based on how quickly or slowly heat dissipation is needed. It is utilized when choosing the type of material to use for heat sinks.

Here A is Thermal conductivity and a is Thermal diffusivity.

Choose metals that lie as far apart on the thermal diffusivity axis as possible, because this region maximizes the thermal displacement.

Copper and steel are probably not lead because it is too soft.

Hence, Cast Iron and Aluminium are selected.

The equation of response time is:

Response Time = (t/2)² / a

Here, t is the thickness and a is Thermal diffusivity.

Convert 2mm to m, it will be 0.002m

In the above equation, substitute 0.002m for t and 5 * 10⁻5 m²/s for a.

Response time = (0.002m/2)² / 5 * 10⁻5 m²/s

Response time = 0.02s.

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Answer: Mass remains constant

Explanation:

Answer: Atoms are single neutral particles, and an ion is a positively or negatively charged particle.

Explanation:

It should be noted that merthiolate are used for skin antiseptics, vaccines, preservatives in cosmetics and ophthalmic solutions.

Merthiolate is simply a mercury-containing substance that can be used as a germ-killer and preservative in several products.

It should be noted that merthiolate poisoning occurs when large amounts of merthiolate come in contact with the skin of a person. Merthiolate is also used in preventing skin infection and cleaning wounds.

In conclusion, the correct option is merthiolate.

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Answer:

The Surface Of The Earth

Explanation:

The Troposphere contains about half of all the air in the entire atmosphere. Because it is at the bottom, air pressure, or the weight of the air, is greatest in this layer. (The surface of the earth is in this layer, making it the answer.)

The dropper bottles containing the anions to be studied were all sodium hydroxide (NaOH) solutions. The dropper bottles containing the cations to be studied were all potassium chloride (KCl) salt solutions.

Salt- A salt is a chemical compound that is produced by the reaction of an acid with a base, which results in a substance that is made up of positively charged ions and negatively charged ions, known as cations and anions, respectively.

Soluble salt- It is formed by reacting an alkali and an acid in a solution. In this case, NaOH and KCl are reacted to form the soluble salt solution, i.e., NaCl solution.

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In muscle cells, the reaction proceeds in the same way when enzyme changes the ∆G of the reaction in cells to something favorable. Option B is correct.

The fact that the reaction catalyzed by aldolase has a positive standard free energy change (∆G˚' ≈ +23 kJ/mol) indicates that the reaction is thermodynamically unfavored under standard conditions. However, in muscle cells, the reaction proceeds in the forward direction, indicating that the actual free energy change (∆G) of the reaction in cells is negative.

The most likely explanation for this is that the enzyme aldolase catalyzes the reaction in such a way that it lowers the activation energy required for the reaction to proceed, making it kinetically favorable. This does not change the thermodynamics of the reaction, but it allows the reaction to occur at a reasonable rate.

Hence, B. is the correct option.

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1A.matter can neither be created nor be destroyed

6.balencing equation steps:--

balencing other than hydrogen nd oxygen

balencing oxygen

balencing hydrogen

balencing charge

Using thermodynamics

\(\\ \sf\longmapsto Q=mc∆T\)

\(\\ \sf\longmapsto Q=0.015(328)(4184)\)

\(\\ \sf\longmapsto Q=20585.28J\)

In order to properly mix these two components together, they must be poured into a special holder called a dappen dish.

When it comes to creating artificial nails using acrylics, the process involves mixing a monomer liquid and polymer powder together to form a pliable mixture that can be shaped and molded. However, in order to properly mix these two components together, they must be poured into a special holder called a dappen dish. This small glass or plastic container is designed to hold the monomer and polymer powder until they are ready to be mixed together with a brush.

The dappen dish allows for precise measurements and easy access to the mixture during the application process. Overall, the dappen dish is a crucial tool in the acrylic nail application process, as it provides a convenient and efficient way to mix the monomer liquid and polymer powder together.

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The mass of the cell wall, assuming the cell is spherical and the wall is a thin spherical shell, is approximately 0.91 milligrams.

To calculate the mass of the cell wall, we first need to determine the volume of the wall.

The given diameter of the cell is 0.00 μm, which means the radius (r) of the cell is half of that, so r = 0.00/2 = 0.00 μm = 0.00 nm.Now, we need to find the volume of the cell wall, which can be approximated as a thin spherical shell. The volume of a thin spherical shell can be calculated using the formula:

V = 4/3 * π * (r_outer^3 - r_inner^3)

Since the cell is spherical, the inner radius of the shell is the same as the radius of the cell (r), and the outer radius of the shell is the sum of the radius of the cell (r) and the thickness of the wall (60.0 nm). Thus, the outer radius (r_outer) of the shell is:

r_outer = r + thickness = 0.00 + 60.0 = 60.0 nm

Substituting the values into the formula, we have:

V = 4/3 * π * (60.0^3 - 0.00^3)

= 4/3 * π * (216,000 nm^3)

= 288,000 π nm^3

Next, we need to calculate the mass of the cell wall using the density of pure water. The density (ρ) is given as 1000 kg/m^3, which is equivalent to 1000 kg/1,000,000,000 nm^3 since 1 m = 1,000,000,000 nm. Thus, the mass (m) of the cell wall is:

m = ρ * V

= 1000 kg/1,000,000,000 nm^3 * 288,000 π nm^3

= 0.000288 π kg

Now, we can calculate the mass of the cell wall by substituting the value of π (pi) as 3.14159:

m = 0.000288 * 3.14159 kg

= 0.000905 kg

≈ 0.91 mg

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Answer:

because the sun illuminates the half of the moon that's facing it leaving the other half dark

Carbon = C

Water = C

Aluminum foil = E

Plastic = E

Tin = E

Silicon dioxide = C

Helium = C

Arsenic = C

Carbon dioxide = C

Sodium Chloride = C

Answer:

Vertebrate Endocrine Glands and Hormones

Unlike plant hormones, animal hormones are often (though not always) produced in specialized hormone-synthesizing glands (shown below). The hormones are then secreted from the glands into the blood stream, where they are transported throughout the body.

After considering the given data we conclude that the number of moles of nitrogen atoms inhaled when a person inhales \(4.31 * 10^{23}\) nitrogen molecules in an average breath of air is 0.36 moles of N atoms (rounded to 2 decimal places).

To evaluate the number of moles of nitrogen atoms inhaled when a person inhales \(4.31 * 10^{23}\)nitrogen molecules in an average breath of air, we have to first convert the number of nitrogen molecules to the number of moles of nitrogen molecules.
Since nitrogen occurs as a diatomic molecule in air, we need to divide the number of nitrogen molecules by 2 to get the number of moles of nitrogen molecules.
Then, we can apply the Avogadro's number to alter the number of moles of nitrogen molecules to the number of moles of nitrogen atoms. The steps are as follows:
Number of moles of nitrogen molecules inhaled:
\(4.31 * 10^{23} / 2\)
\(= 2.155 * 10^{23} (molecules of) N_2\)
Number of moles of nitrogen atoms inhaled:
\(2.155 * 10^{23} / 6.022 * 10^{23}\)
= 0.358 moles of N atoms
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The mass of the solid is  2733 g

The mole is a useful unit of measurement in chemistry because it allows scientists to easily compare the amounts of different substances in chemical reactions. By knowing the molar amounts of the reactants and products in a chemical reaction, scientists can calculate important information such as the mass of products formed, the amount of energy released or absorbed, and other key chemical properties.

We know that;

1 mole of the compound would contain 6.02 * 10^23 molecules

x moles of the compound will contain  9.62 x 10^24 molecules

x= 15.98 moles

Then;

Mass = 15.98 moles * 171 g/mol

= 2733 g

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a. 1, 1, 1

N+H--------NH

The scientific statement is

D. There is life on some other planet in the universe aside from Earth.

A scientific statement is a statement that is based on empirical evidence, logical reasoning, and the scientific method. It is a claim or proposition that can be tested, observed, or measured, and is subject to scrutiny and verification.

Scientific statements are characterized by objectivity, reliance on evidence, and the potential for falsifiability or validation through experiments or further investigation. these statements aim to describe, explain, or predict phenomena in the natural world and are an essential part of scientific inquiry and the advancement of knowledge.

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complete question

Which sentence is a scientific statement?

A.

Food cooked in ceramic pots has a better aroma than food cooked in copper pots.

B.

A tall glass of water tastes better with a lemon wedge and ice cubes.

C.

Today, there are more viewers watching baseball than ice hockey on television.

D.

There is life on some other planet in the universe aside from Earth

The dissociation equations are shown as;

a) \(HCl ------ > H^+ + Cl^-\)

b) \(H C_{2} H_{3}O_{2} ---- > C_{2} H_{3}O_{2} ^- +H^+\)

C) \(NH_{4} ----- > NH_{3} + H^+\)

D) \(C_{6} H_{5} NH_{3} ^+ ------- > C_{6} H_{5} NH_{2} + H^+\)

E) \([Al(H_{2} O)_6}] ^{3+} ------ > Al^{3+}\)

The term dissociation has to do with the procedure by which a substance can be broken up into its components. The components of a substance are those that have to come together so as to form the compound.

When the compound is to be broken up, the components that came together to make up the compound can broken up and then we have the original compounds tat we have at the start of the reaction.  In this case, the decomposition equations have been shown with the exclusion of water.

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The Kelvin temperature of the gas is 1010 K

Given, Number of moles of gas = 3.0 mol

Total average kinetic energy = Kinetic energy of bullet

= 37.7 × 10−3 kg × (820 m/s)²/2

= 12614 J

By using the formula,

Total average kinetic energy= 3/2nRT

where,

n= Number of moles of the gas

R = Universal gas constant

T = Kelvin temperature of the gas

R = 8.314 JK^-1mol^-1

3/2nRT = 12614 JK^-13/2(3.0 mol)RT

= 8409 JK^-1K

= T/R8409 JK^-1/8.314 JK^-1mol^-1

= 1010 K

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The Kelvin temperature of the gas is 335 K.

Given data:

- Number of moles of gas, n = 3.0 mol.

- Total average kinetic energy of gas molecules = Kinetic energy of a 37.7×10^(-3) kg bullet with a speed of 820 m/s.

The kinetic energy of the bullet is given as:

K.E. = (1/2)mv^2

K.E. = (1/2)(37.7×10^(-3) kg)(820 m/s)^2

K.E. = 12.4 kJ

The average kinetic energy of one mole of gas is given by:

K.E. = (3/2)RT

where R = gas constant = 8.314 J/mol K

and T is the temperature of gas in Kelvin.

Rearranging the equation, we get:

T = (2/3)K.E. / R

Substituting the values, we have:

T = (2/3)(12.4×10³ J) / (8.314 J/mol K)(3.0 mol)

T = 335 K

Therefore, the Kelvin temperature of the gas is 335 K.

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Answer:

Magnesium sulfide

Explanation:

To determine the energy absorbed by the water when it begins to boil, we can use the given information that it takes 36400 cal to heat a pint of water from room temperature to boiling.

First, we need to convert the given amount of water from pints to liters. Since 1 pint is approximately 0.473 liters, we can calculate:

0.800 pint * 0.473 liters/pint = 0.3784 liters

Next, we convert the given calories to kilojoules. Since 1 calorie is approximately 4.184 joules, and 1 kilojoule is 1000 joules, we have:

36400 cal * (4.184 J/cal) * (1 kJ/1000 J) = 152.2256 kJ

Therefore, approximately 152.226 kilojoules of heat energy will have been absorbed by the water when it begins to boil.

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The ratio of HH, HT, and TH outcomes when you make 5 coin tosses is : 1. HH: 1/4 or 0.252. HT: 1/4 or 0.253.

When we flip a coin, we have two possible outcomes: heads (H) or tails (T).In a sequence of coin tosses, three distinct outcomes are possible: head-head (HH), head-tail (HT), and tail-head (TH). We can find the probability of each outcome and then express it as a ratio. Let's take a look at each outcome:Head-Head (HH)If we flip a coin twice, the probability of getting two heads (HH) is: 1/2 * 1/2 = 1/4 or 0.25. This means that out of all possible outcomes, 25% will be HH.Head-Tail (HT)If we flip a coin twice, the probability of getting a head-tail (HT) combination is: 1/2 * 1/2 = 1/4 or 0.25. This means that out of all possible outcomes, 25% will be HT.Tail-Head (TH)

If we flip a coin twice, the probability of getting a tail-head (TH) combination is: 1/2 * 1/2 = 1/4 or 0.25. This means that out of all possible outcomes, 25% will be TH.TH: 1/4 or 0.25.This means that out of all possible outcomes, each combination has a 25% chance of occurring.

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