1. a balloon
is filled with hydrogen at a temperature of 22.0°c and a pressure of
$12 mm hg. if the balloon's original volume was 1.25 liters, what will its new
volume be at a higher altitude, where the pressure is only 625 mm hg? assume
the temperature stays the same.

Water is an amphoteric molecule, meaning it can act as both an acid and a base depending on its environment. A weak acid is a weak electrolyte because it produces a low concentration of ions in solution.

Lastly, a reversible reaction means that the forward and reverse reactions occur simultaneously and can proceed at different rates, with the rate of the reverse reaction potentially being faster than the rate of the forward reaction. In the given reaction, HCOOH + H2O  HCOO- + H3O+, the reaction is reversible and can proceed in both the forward and reverse directions.

Water can react as both an acid and a base depending on its environment, making it an amphoteric molecule. A weak acid is also a weak electrolyte because it produces a low concentration of ions in solution. In a reversible reaction like HCOOH + H2O  HCOO- + H3O+, forward and reverse reactions occur simultaneously.

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Answer:

B is incorrect

Explanation:

Ocean are made of salt water which is undrinkable therefore they are not any type of drinking water source.

The arrangement of the ions in order of decreasing ionic radii is;

\(S^{2-}\) > \(P^{3-}\) > \(Cl^{-}\) > \(K^+\) > \(Sc^{3+}\)

We know that the ionic radii has to do with the distance that is measured between the nucleus of the ion up to the outermost electron that can be found inside the ion. This tells us a lot about the way that the ion behaves.

Let us have at the back of our minds that the ionic radius and the atomic radius are two things that are very much connected as we discuss the properties of the elements. Both the ionic radius and the atomic radius does increase down the group but decrease across the period.

We now have a series of ions and the position of the ions in the periodic table is going to determine hw they would be ranked in order of decreasing ionic radii.

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Given data

Patient's mass in lb = 169 lb

Dosage = 5 mg/kg

1 lb = 453.6 g

Chemistry -> Measurements -> Mass and weight

When the doctor prescribes a medication at a dosage of 5 mg/kg, the amount of medication the patient is going to ingest depends on their weight. If the patient's weight were 1 kg, for example, he or she would take 5 mg of that medication.

Based on this logic, we first have to convert the patient's weight from pounds to kilograms, knowing 1 kg is the same as 1000 grams.

Let's use the following conversion factor:

Since the patient weighs 76.66 kg, the next step multiplying by the dosage, like the following:

Final answer:

The patient should take 383.3 mg of the medication prescribed.

Answer:

134,061.9 dollars and 118,222.45 lbs.

Explanation: you're welcome :)

Acid rain can be extremely harmful to forests. Acid rain that seeps into the ground can dissolve nutrients, such as magnesium and calcium, that trees need to be healthy. Acid rain also causes the aluminum to be released into the soil, which makes it difficult for trees to take up water.

The reaction is 2 C6H6 + 15 O2 -> 12 CO2 + 6 H2O.

What is combustion?

Combustion is the oldest technology known to mankind and one of our most significant discoveries or inventions. Combustion has been around for a very long time. Fire, along with earth, water, and air, was thought to be one of the four basic elements in the cosmos from antiquity through the mediaeval centuries. Combustion, explosion, and flame have all been observed and speculated since the dawn of time. Each culture has its own explanation. The Greeks explained combustion in terms of philosophical beliefs, one of which was that all fuel bodies included a "inflammable essence," which exited when the body was burned to react with air.

The reaction is:

C6H6 + O2 -> CO2 + H2O

Balance C:

C6H6 + O2 -> 6 CO2 + H2O

Balance H:

C6H6 + O2 -> 6 CO2 + 3 H2O

Balance O:

2 C6H6 + 15 O2 -> 12 CO2 + 6 H2O

The reaction is 2 C6H6 + 15 O2 -> 12 CO2 + 6 H2O.

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Answer:

tin (IV) oxide octahydrate contains 8 part water

What is the percent composition of water found in tin (IV) oxide octahydrate?

The total number of moles are given by n = 0.25 moles and N=6.022×10²³molecules/mole is the Avogadro number. N is equal to 6.0220 × 10²³ molecules/mole. Therefore, there are 1.51 × 10²³ molecules overall 1.05 × 10²³ molecules.

The International System of Units uses the mole symbol as mol as the unit of material quantity. How many elementary entities of a certain substance are present in an item or sample is determined by the quantity of that material. It is specified that the mole contains precisely 6.022 × 10 ²³ elementary entities.

The term was generally first used by German chemist Wilhelm Ostwald. However, the Latin term moles, which meaning "a mass," is where the word mole ultimately originates, not from German. A comparable term to mole is molecule, it is the diminutive and means "a little mass."

Therefore, there are 1.51 × 10²³ molecules overall 1.05 × 10²³ molecules.

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Answer:

The answer is 7 (seven)

Explanation:

Fluorine has seven of eight possible electrons in its outermost energy level, which is energy level II.

Answer:

1. False

2.True

Explanation:

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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the formula below for the application of KVL around i1 is KVL around loop i1: -10V + 5Ω * (I1 - I2) + 10Ω * I1 = 0.

According to Kirchhoff's Voltage Law (KVL), the sum of the voltages around a closed loop in a circuit is equal to zero. In this case, we are applying KVL around loop i1. The equation represents the sum of voltage drops in the loop, where -10V is a voltage source, 5Ω * (I1 - I2) represents the voltage drop across the 5Ω resistor due to the difference in mesh currents I1 and I2, and 10Ω * I1 represents the voltage drop across the 10Ω resistor due to the current I1. The equation is set equal to zero to satisfy KVL.

ii. KVL around loop i2: 10Ω * I2 - 5Ω * (I1 - I2) + 2V = 0

Similar to i, this equation represents the application of KVL around loop i2. The 10Ω * I2 term represents the voltage drop across the 10Ω resistor due to the current I2, the -5Ω * (I1 - I2) term represents the voltage drop across the 5Ω resistor due to the difference in mesh currents I1 and I2, and the 2V term represents a voltage source. The equation is set equal to zero to satisfy KVL.

iii. Determine the current i1: Substitute the obtained values into the equation for i1 and solve for I1 in mA.

iv. Determine the current i2: Substitute the obtained values into the equation for i2 and solve for I2 in mA.

v. Determine Vo: Substitute the obtained values for i1 and i2 into the appropriate equation representing the voltage at Vo, and calculate the value in V.

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Answer:

open the windows, turn off all electronics (take out all of the plugs), then find where the gas is coming from.

Explanation:

**MARK BRAINLIEST**

Avogadro's number is approximately 6.022 × 10^23 formula units per mole.

Given that there are 3.0 × 10^23 formula units of KI, we can calculate the number of moles of KI by dividing the number of formula units by Avogadro's number:

Number of moles = (3.0 × 10^23 formula units) / (6.022 × 10^23 formula units/mol)

Number of moles ≈ 0.498 mol

To find the mass of KI, we can use the molar mass of KI:

Mass of KI = Number of moles × Molar mass

Mass of KI = 0.498 mol × 166 g/mol

Mass of KI ≈ 82.668 g

Therefore, there are approximately 82.668 grams of KI in the sample.

A solution was prepared by dissolving 0.02 moles of acetic acid in water to give 1 liter of solution then the pH is 2.88.

Solution was then added 0.008 moles of concentrated sodium hydroxide (NaOH) then the new pH is 4.56.

When additional 0.012 moles of NaOH is then added then the pH is 12.3.

a) To find the pH of a solution of 0.02 moles of acetic acid in water, we need to use the acid dissociation constant (Ka) of acetic acid, which is 1.74 x 10⁻⁵. We can set up an equation for the dissociation of acetic acid in water:

HOAc + H₂O ⇌ H₃O⁺ + OAc⁻

Ka = [H₃O⁺][OAc-] / [HOAc]

At equilibrium, the concentration of HOAc that dissociates is x, so [H₃O⁺] = x and [OAc⁻] = x. The concentration of undissociated HOAc is (0.02 - x).

Substituting these values into the equilibrium expression and solving for x, we get:

Ka = x² / (0.02 - x) = 1.74 x 10⁻⁵

x = [H₃O⁺] = 1.32 x 10⁻³ M

pH = -㏒[H³O⁺] = 2.88

b) When 0.008 moles of NaOH is added, it reacts with acetic acid to form sodium acetate and water:

HOAc + NaOH ⇌ NaOAc + H₂O

The reaction consumes some of the acetic acid and increases the concentration of acetate ions. We can use the Henderson-Hasselbalch equation to calculate the new pH:

pH = pKa + ㏒([OAc⁻]/[HOAc])

At equilibrium, the concentration of acetate ions is:

[OAc⁻] = [NaOAc] = (0.008 mol) / (1 L) = 0.008 M

The concentration of undissociated HOAc is (0.02 - 0.008) = 0.012 M. Substituting these values into the Henderson-Hasselbalch equation, we get:

pH = 4.8 + ㏒(0.008/0.012) = 4.56

c) Adding an additional 0.012 moles of NaOH will cause all of the remaining HOAc to react with NaOH. The reaction will produce 0.012 moles of sodium acetate and water. The concentration of acetate ions will increase to:

[OAc⁻] = [NaOAc] / (1 L) = (0.008 + 0.012) M = 0.02 M

The concentration of H₃O⁺ ions can be calculated using the equation for the dissociation of water:

H₂O ⇌ H₃O⁺ + OH⁻

Kw = [H₃O⁺][OH⁻] = 1.0 x 10⁻¹⁴

[H₃O⁺] = Kw / [OH⁻] = 1.0 x 10⁻¹⁴ / 0.02 = 5.0 x 10⁻¹³ M

pH = -㏒[H₃O⁺] = 12.3

Therefore, the pH of the solution after the addition of 0.012 moles of NaOH is 12.3. This problem demonstrates how to calculate pH changes in an acid-base system due to the addition of a strong base.

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Given :

Number of molecules of \(C_4H_2F_7I\).

To Find :

How many moles are in given number of molecules.

Solution :

We know, in 1 moles of any element/compound contains \(6.022\times 10^{23}\) at atoms/molecules.

So, number of moles in \(5.4\times 10^{24}\) molecules are :

\(n = \dfrac{5.4\times 10^{24}}{6.022\times 10^{23}}\\\\n = 8.97 \ moles\)

Therefore, number of moles are 8.97 .

Answer:

see the file the answer is there:)

The arrangement of radial, symmetric, and asymmetric letters is found in the attachment.

Bilateral Letters: These are letters that have a symmetrical shape where the left and right sides are mirror images of each other. In other words, if you were to draw a vertical line down the center of the letter, both sides would be identical.

Examples of bilateral letters include B, C, D, E, G, H, K, M, O, P, Q, R, S, U, and V.

Radial Letters: These are letters that have a symmetrical or circular shape around a central point. If you were to draw a circle around the letter, it would fit within that circle.

Examples of radial letters include A, C, D, M, and O.

Asymmetric Letters: These are letters that do not have symmetry or balance. If you were to draw a vertical line down the center of the letter, the two sides would not be mirror images of each other.

Examples of asymmetric letters include I, J, L, N, T, U, V, W, X, Y, and Z.

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When soluble mercury compounds get into the water supply, they can pose a serious health risk to humans and wildlife. Aluminum sulfate, also known as alum, is commonly added to the water flowing through treatment plants as a coagulant. Coagulation is a process that involves adding chemicals to the water to make the mercury and other contaminants clump together into larger particles, which can then be more easily removed from the water.

Alum works by creating positively charged aluminum ions, which attract the negatively charged mercury ions in the water. As these ions come together, they form larger particles that can be more easily filtered out of the water. Additionally, alum can also help to remove other contaminants, such as suspended solids, bacteria, and viruses, which can also pose health risks.

Once the mercury and other contaminants have been coagulated and removed from the water, it can then be treated with other chemicals, such as activated carbon or chlorine, to further remove any remaining pollutants and disinfect the water. This ensures that the water is safe for human consumption and does not pose a risk to public health.

In summary, adding aluminum sulfate to water treatment plants helps to remove mercury and other contaminants from the water supply by coagulating the particles and making them easier to filter out. This is an important step in ensuring that the water is safe for human consumption and does not pose a health risk to the public.  

Thanks.

Answer:

[(x-37.5)/x]*100%

62.5%  (assuming the original sample weighs 100.0g)

Explanation:

Let's say that the original sample is x

Mass of I-125 which has decayed: x-37.5

Percentage of decayed mass: [(x-37.5)/x]*100%

Please recheck, for this may not be the correct answer

In molecule (a), the tetrahedral center has a stereochemical configuration of R. In molecule (b), the tetrahedral center has a stereochemical configuration of S. It is important to note that the tetrahedral centers in the molecules have a stereochemistry, which refers to the arrangement of atoms around the center in three-dimensional space.

It can be determined by making a model of the structure and examining the relative positions of the substituent groups. This field of chemistry is called stereochemistry. However, it should be noted that in the given molecules, there is no stereochemistry at the nitrogen atom or the sulfur atom, as they are not tetrahedral centers.
It seems like you want to know the stereochemical configuration of the tetrahedral centers in two molecules. Here's how to determine the stereochemistry:
1. Assign priorities to the four groups attached to the tetrahedral center based on the atomic numbers of the directly attached atoms. Higher atomic number gets a higher priority (1 being the highest and 4 being the lowest).
2. If two groups have the same atomic number, move to the next attached atoms and compare their atomic numbers to break the tie.
3. If necessary, rotate the molecule in your mind or using a model so that the group with the lowest priority (4) is oriented away from you (in the back).
4. Observe the order of the other three groups (1, 2, and 3) in a clockwise or counterclockwise direction.
5. If the order is clockwise, the stereochemical configuration is R (rectus). If it's counterclockwise, the configuration is S (sinister).

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Answer:

2) non metals

Explanation:

non metals is the right side of the periodic table

The prepare a 0.120 M aqueous solution of silver fluoride (Gf) using a 300 mL volumetric flask, follow these steps Calculate the number of moles of silver fluoride needed Molarity M = moles of solute / volume of solution in liters
Rearrange the equation.

The find the moles of solute moles of solute = Molarity (M) × volume of solution in liters moles of Gf = 0.120 M × 0.300 L = 0.036 moles Calculate the mass of silver fluoride required Mass (g) = moles × molar mass of Gf The molar mass of Gf = 108 g/mol (Ag) + 19 g/mol (F) = 127 g/mol Mass of Gf = 0.036 moles × 127 g/mol = 4.572 g Measure 4.572 grams of solid silver fluoride using a balance and add it to the 300 mL volumetric flask. Fill the volumetric flask with distilled water until it reaches the 300 mL mark and mix well to ensure the silver fluoride is completely dissolved. You have now prepared a 0.120 M aqueous solution of silver fluoride using a 300 mL volumetric flask by adding 4.572 grams of solid silver fluoride.

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If we have solution with Ethanol as solvent and Water as solute, it is expected that water will not be dissolved in ethanol, because of the polarity, since water is polar and ethanol is only a little bit polar, they don't mix, which means that water will not be dissolved in ethanol

The relative abundance of isotopes is the number of atoms of a particular isotope divide by the total number of atoms of all isotopes of that element, multiplied 100 percent.

The relative abundance of an isotope is the percentage of atoms with a specific atomic mass found in a naturally occurring sample of an element.

Also relative abundances refers to the relative proportions of the stable isotopes of each element. They are most often quoted as atom percentages

To calculate the percent abundance of each isotope in a sample of an element,  the number of atoms of a particular isotope is usually divide by the total number of atoms of all isotopes of that element and then multiply the result by 100 since it is expressed in percentage.

Mathematically, the formula for relative abundance is given as;

R.A = ( number of atoms of isotope / total number of atoms ) x 100%

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Answer:

0.132

Explanation:

is the only part i know

Answer:

No, there is not because it would form H2 instead of methane if hydrogen bonded with itself.

Explanation:

from the shape of methane which is tetrahedral it's evident there's no hydrogen bond only C-H bond.

The chemical formula of methane is \(CH_4\) but: C. No, there is no bond between any of the hydrogen atoms because it would form \(H_2\) instead of methane if hydrogen bonded with itself.

A chemical bond is defined as the forces of attraction existing between ions, crystals, atoms or molecules and they are mainly responsible for the formation of chemical compounds.

This ultimately implies that, a chemical bond refers to a force holding two or more atoms together and binding ions, crystals, or molecules together, in order to form a chemical compound.

Methane comprises of an atom of carbon and four (4) atoms of hydrogen.

Basically, hydrogen only shares a single (one) valence electron with carbon but not itself (hydrogen atoms) to form methane because of the \(sp^3\) hybridization.

Hence, there is no bond existing between any of the four (4) hydrogen atoms because it would form \(H_2\) instead of methane (\(CH_4\)), if hydrogen bonded with itself.

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Answer:

Neutrons and Protons, Electrons

Explanation:

Neutrons and protons are in the inside as electrons orbit around it in a circular pattern