Determine whether each statement is a description of a physical property or a chemical property

11.15 mg/L of lead is present in the sample of potable water.

To calculate the concentration of lead in milligrams per liter (mg/L), we need to convert the volume of the sample from milliliters (mL) to liters (L).

1 L = 1000 mL

Therefore, the volume of the sample in liters is:

1435 mL ÷ 1000 mL/L = 1.435 L

Next, we can use the formula:

Concentration = Amount of solute ÷ Volume of solution

where the amount of solute is given in milligrams (mg) and the volume of solution is given in liters (L).

Substituting the values we have:

Concentration = 16.0 mg ÷ 1.435 L

Concentration = 11.15 mg/L

Therefore, the concentration of lead in the drinking water sample is 11.15 mg/L.

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To calculate the concentration of lead in milligrams per liter, we first need to convert the volume of the sample to liters and the mass of lead to milligrams.

Lead is a chemical element with the symbol Pb (from the Latin word plumbum) and atomic number 82. It is a soft, dense, bluish-grey metal that is toxic and can cause serious health problems, particularly in children and pregnant women.

Given:

Volume of sample (V) = 1435 mL = 1.435 L

Mass of lead (m) = 16.0 mg

We can use the formula for concentration:

concentration = mass of solute / volume of solution

Substituting the values:

concentration = 16.0 mg / 1.435 L

Simplifying:

concentration = 11.14 mg/L

Therefore, the concentration of lead in the drinking water sample is 11.14 milligrams per liter.

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We need to add 5.61 ml of a 2.67 M stock solution dye to a 50 ml volumetric flask before filling the flask to the calibration mark.

This can be found using the formula of concentration and volume for dilution of solutions which is C1V1=C2V2.

Steps for finding the ml of a 2.67 M stock solution that should be added to a 50 ml volumetric flask before filling the flask to the calibration mark:

C1= is the initial concentration of the solution

V1 = is the initial volume of the solution

C2 = is the final concentration of the solution

V2 = is the final volume of the solution

Now, let's substitute the given values into the formula

Stock concentration : 2.67 M = C1

Final concentration : 0.30 M = C2

Final Volume : 50 ml = V2

Let V1 is the stock solution required

Therefore, 2.67 M * V1 = 0.30 M * 50 ml

2.67 M * V1 = 15 ml

V1 = 5.61 ml

Therefore, we need to add 5.61 ml of a 2.67 M stock solution to a 50 ml volumetric flask before filling the flask to the calibration mark to prepare a 0.30 M solution of food dye.

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Answer:

How should viruses be classified - as living or non-living?

Explanation:

The order of decreasing pH from highest to lowest is Ba(OH)2 > NaOH > N2H4 > HOCI > HCI.

pH measures how acidic or basic a solution is, based on the concentration of hydrogen ions (H+) in the solution. A low pH means a high concentration of H+ ions, making the solution more acidic. A high pH means a low concentration of H+ ions, making the solution more basic or alkaline.

NaOH is a strong base that completely dissociates in water, producing a high concentration of OH- ions and a pH of 14. Ba(OH)2 is also a strong base and produces twice as many OH- ions as NaOH, so it has an even higher pH than NaOH. HOCI is a weak acid partially dissociating in water, producing H+ and ClO- ions. The equilibrium between the two ions determines the pH, which is around 4.5 for a 0.10 M solution.

HCI is a strong acid dissociating completely in water, producing H+ and Cl- ions. Since the concentration of H+ ions is very high, the pH is very low (around 1). N2H4 is a weak base partially dissociating in water, producing NH3 and NH2- ions. The equilibrium between the two ions determines the pH, which is around 8.4 for a 0.10 M solution.

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the value of ΔH for the reaction of 18.1 g of hydrogen gas (H2) with excess oxygen to form water at constant pressure is -2,174.524 kJ. Since the value is negative, this indicates that the reaction is exothermic, and releases heat.

The first step is to calculate the number of moles of hydrogen gas (H2) in the 18.1 g sample:

moles of H2 = mass of H2 / molar mass of H2

moles of H2 = 18.1 g / 2.016 g/mol

moles of H2 = 8.98 mol

Since 1 mole of hydrogen gas (H2) releases 241.8 kJ of energy, we can use the following formula to calculate the amount of energy released by 8.98 mol of H2:

ΔH = nΔH_rxn

where n is the number of moles of H2 and ΔH_rxn is the molar enthalpy change for the reaction.

ΔH = 8.98 mol x (-241.8 kJ/mol)

ΔH = -2,174.524 kJ

Energy is the capacity of a physical system to perform work. It is an essential aspect of our daily lives and is involved in almost all human activities, from heating and cooling our homes to powering transportation and manufacturing processes.

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If my lab partner is interested in studying how industrial chemicals pollute the environment, I would recommend him to take specialization in the field of environmental chemistry.

Environmental chemistry is a branch of chemistry of utmost importance as it deals with the various impacts that are caused upon the environment by chemicals  released from industries and day to day activities.

I would recommend my lab partner to take courses of analytical chemistry, physical, inorganic and organic chemistry as well in order to investigate in depths of environmental chemistry. All these fields are needed to be studied in order to study about the occurrence of environmental pollution by industrial chemicals.

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The cation that is produced when calcium chloride dissociates in the presence of water is Ca²⁺.

In the presence of water, calcium chloride dissociates into its constituent ions:

CaCl₂(s) + H₂O(l) → Ca²⁺(aq) + 2Cl⁻(aq)

As seen from the equation, the cation which is produced when calcium chloride dissociates in the presence of water is Ca²⁺.

Calcium chloride (CaCl₂) is a chemical compound that is commonly used in a variety of applications, such as in de-icing and dust control, as a food additive, and in water treatment.

It is a white crystalline solid that is highly soluble in water and has a salty taste. When calcium chloride is dissolved in water, it dissociates into calcium cations (Ca²⁺) and chloride anions (Cl⁻), making it an electrolyte. Calcium chloride is also used in the production of cement and as a desiccant to remove moisture from the air.

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When a large tablet dissolves in water, releasing a lot of bubbles, it is a: chemical change occurs.

The dissolved tablet changes the chemical composition of the water. Here's a step-by-step explanation:

When a large tablet is added to water, it begins to dissolve in the water. This process is known as a physical change because no new substance has been formed. However, the large tablet is made up of chemicals that are reacting with the water as it dissolves. As the chemicals react, they produce a lot of bubbles.

The bubbles are formed because of a chemical reaction that occurs when the tablet dissolves. As the chemicals in the tablet react with the water, they release gases such as carbon dioxide. The carbon dioxide gas is what causes the bubbles to form.

The chemical reaction that takes place between the chemicals in the tablet and the water is irreversible, meaning that a new substance is formed. The tablet dissolving in water is a great example of a chemical change because a new substance is formed when the chemicals in the tablet react with the water.

In this case, the bubbles are a byproduct of the chemical reaction that takes place when the tablet dissolves. Therefore, the release of bubbles during the dissolving of the tablet is an indication of a chemical change.

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The theoretical yield of [tex]NH_4NO_3[/tex] in grams is 52,856 g or 52.9 kg.

To determine the theoretical yield of the limiting reactant in grams, we need to follow these steps:

Calculate the moles of each reactant using the ideal gas law: PV = nRT, where P is pressure, V is volume, n is moles, R is the gas constant, and T is the temperature in Kelvin.

For nitrogen gas (N2):

n = PV/RT = (1 atm) * (16608 L) / [(0.08206 L atm/mol K) * (293.15 K)] = 660.5 mol

For oxygen gas (O2):

n = PV/RT = (1 atm) * (7.2123 L) / [(0.08206 L atm/mol K) * (293.15 K)] = 0.2876 mol

For water (H2O):

n = PV/RT = (1 atm) * (7.2310 L) / [(0.08206 L atm/mol K) * (293.15 K)] = 0.2891 mol

Determine the limiting reactant by comparing the moles of each reactant to the stoichiometry of the balanced chemical equation. We can see from the equation that 2 moles of N2 react with 1 mole of O2 and 4 moles of H2O, so the mole ratio of N2 to O2 is 2:1 and the mole ratio of N2 to H2O is 2:4 or 1:2. Therefore, N2 is the limiting reactant since it has the smallest number of moles.

Calculate the moles of [tex]NH_4NO_3\\[/tex] produced by using the mole ratio between N2 and [tex]NH_4NO_3[/tex]. From the balanced chemical equation, we see that 2 moles of N2 produce 2 moles of[tex]NH_4NO_3[/tex]. Therefore, the number of moles of [tex]NH_4NO_3[/tex] produced is equal to the number of moles of N2:

moles of [tex]NH_4NO_3[/tex]= 660.5 mol

Convert the moles of [tex]NH_4NO_3[/tex] to grams using its molar mass. The molar

mass of NH₄NO₃ is 80.0434 g/mol.

mass of NH₄NO₃ = moles of NH4NO3 x molar mass of NH4NO3

mass of NH₄NO₃ = 660.5 mol x 80.0434 g/mol

mass of NH₄NO₃ = 52,856 g or 52.9 kg

Therefore, the theoretical yield of NH₄NO₃ in grams is 52,856 g or 52.9 kg.

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For 80% of the reactant to break down, it will take 31.5 seconds on average.

One reactant decomposing into two or more products is known as a decomposition reaction. The all-inclusive formula AB A + B can be used to represent this.

It is possible to express the rate law for reactant A's breakdown as follows:  rate = k[A]

The integrated rate law for a first-order reaction is: ln([A]/[A]0) = -kt

When we enter this together with the supplied values into the integrated rate law, we obtain:

ln(0.20) = -0.0092 s⁻¹ * t

Solving for t, we get:

t = -ln(0.20) / 0.0092 s⁻¹

t = 31.5 seconds

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Answer:

174.94 sec

Explanation:

ln [A] = ln[A]o -kt

If 80% of the reactant has decomposed, that means that 20% of the reactant remain. Since the rate (k=.0092s^-1) has a unit of s^-1, 23 know its a first order, so we use:

ln [A] = ln[A]o -kt

ln (20) = ln (100) - (0.0092)t

ln(.2)/.0092 = t

174.94 sec = t

Answer:

anyone know the answers

Explanation:

When a solution containing strontium ions ([tex]Sr^{2+}[/tex]) is added to the Bunsen burner flame, it changes the color to red. Therefore, the answer is option A, red.

A Bunsen burner is a laboratory equipment that produces a single open gas flame, which is used for heating, sterilization, and combustion reactions. A Bunsen burner produces a clean blue flame when it is set to the right mixture of air and gas.

The color of a Bunsen burner flame is determined by the temperature of the flame and the chemicals being burned. The addition of chemicals to a Bunsen burner flame can cause it to change color.

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Millimoles (mmol) can be calculated from molarity and volume using the following formula: mmol = M x V, where M is the molarity in mol/L and V is the volume in L. To calculate the molarity from mmol/mL, one can simply divide the mmol value by the volume in mL and convert to mol/L by multiplying by 1000.

Molarity is a measure of the concentration of a solution, defined as the number of moles of solute per liter of solution. Millimoles (mmol) is a unit of measurement that is often used in biochemistry and other fields to express small amounts of substances. To convert between molarity and millimoles, one can use the formula mmol = M x V, where M is the molarity in mol/L and V is the volume in L.

This formula allows one to calculate the number of millimoles of solute present in a given volume of solution, given the molarity. Conversely, to calculate the molarity from millimoles, one can simply divide the mmol value by the volume in mL and convert to mol/L by multiplying by 1000. It is important to use the correct units when making these conversions to ensure accurate results.

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To remove an amino group (-NH₂) from an amino acid and convert it to pyruvate or acetyl CoA, a process called deamination.

Deamination involves the removal of the amino group from the amino acid, resulting in the formation of ammonia (NH3) and a keto acid. Pyruvate is a keto acid, while acetyl CoA is derived from a keto acid through a further series of reactions.

There are two main pathways by which deamination can occur in the body: Transamination: In this pathway, the amino group is transferred from the amino acid to an alpha-keto acid, resulting in the formation of the new amino acid and the new keto acid. The enzyme responsible for this reaction is called transaminase or aminotransferase. Pyridoxal phosphate (PLP), a derivative of vitamin B6, is a cofactor required for this reaction.

Oxidative deamination: In this pathway, the amino group is directly removed from the amino acid and transferred to a molecule of oxygen, resulting in the formation of ammonia and a keto acid. The enzyme responsible for this reaction is called deaminase, and it requires the presence of molecular oxygen.

Once the amino group has been removed from the amino acid, the resulting keto acid can be further metabolized to form pyruvate or acetyl CoA through a series of additional reactions in various metabolic pathways, depending on the specific amino acid and the conditions of the reaction.

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Option B, the surface area of the solvent, does not affect the rate of dissolving a solid in a liquid. The rate of dissolving a solid in a liquid is affected by several factors, including temperature, the surface area of the solute, and agitation.

Increasing the temperature of the solvent typically increases the rate of dissolving because it increases the kinetic energy of the solvent molecules, allowing them to interact more effectively with the solute. Increasing the surface area of the solute by breaking it into smaller pieces also increases the rate of dissolving because it provides more surface area for the solvent to interact with. Agitation, such as stirring or shaking, increases the rate of dissolving by keeping fresh solvent in contact with the solute.

However, the surface area of the solvent itself does not affect the rate of dissolving a solid in a liquid because it is the solute that is dissolving into the solvent, not the other way around. Therefore, the surface area of the solvent is not a factor that affects the rate of dissolving.

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Net ionic equation for the reaction that occurs between aqueous solutions of potassium phosphate and aluminum chloride is Al3+(aq.) + PO43–(aq.) → AlPO4(s). So, option (b) is correct.

The net ionic equation is defined as the chemical equation that shows only those elements, compounds, and ions that are directly involved in the chemical reaction. Aqueous potassium phosphate reacts with aqueous aluminum chloride to form aqueous potassium chloride and solid aluminum phosphate. The balanced equation of the reaction between aqueous aluminum chloride and potassium phosphate to form aqueous potassium chloride and solid aluminum phosphate is,

K3PO4(aq.) + AlCl3(aq.) ---> 3 KCL (aq.) + AlPO4(s)

Net ionic equations must be balanced by both mass and charge that means we have to ensure that there are equal masses of each element on the product and reactant sides. Balancing the equation by charge means making sure that the overall charge is the same on both sides of the equation. Balancing the molecular equation properly the net ionic equation will end up being balanced by both mass and charge of the equation.

Al3+(aq.) + PO43–(aq.) → AlPO4(s)

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Certain RNAs coordinate the synthesis of proteins at ribosomes, which are structures found in the cytoplasm.

Correct option is , True.

Every protein starts its production in the cytoplasm. Nonetheless, some are moved to other cellular locations while the majority remain there permanently. Some molecules are entirely produced in the cytoplasm.

It takes part in the signalling process that occurs between the nucleus, organelles, and cell membrane. It transports metabolites from the cell's production site to other parts of the body. It is critical that a cell divides throughout cytokinesis or mitosis. The cytoplasm is involved in eukaryote metabolism.

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A proposed structure for the molecule with the molecular formula [tex]C_{9}H_{12}[/tex] , given the spectroscopic data, is 1-methyl-3-propylbenzene.

To propose a structure for a molecule with the molecular formula [tex]C_{9}H_{12}[/tex] and corresponding to the given spectroscopic data, we can follow these steps:

1. Analyze the 1H NMR data:
  - d 6.78 (s, 1H) indicates a single hydrogen on an aromatic or unsaturated carbon.
  - d 2.26 (s, 3H) suggests a methyl group (-CH3).

2. Analyze the 13C NMR data:
  - d 137.7 (no peak in DEPT-135 or DEPT-90) corresponds to a quaternary carbon (no hydrogens attached).
  - d 127.0 (up peaks in both DEPT-135 and DEPT-90) indicates a carbon with one hydrogen attached.
  - d 21.2 (up peak in DEPT-135, no peak in DEPT-90) signifies a methyl carbon.

3. Combine the information:
  - From the 1H NMR, we have one aromatic/unsaturated hydrogen and one methyl group.
  - From the 13C NMR, we have one quaternary carbon, one carbon with a single hydrogen, and one methyl carbon.

4. Propose a structure:
  - The molecule has nine carbons, so it could be an aromatic compound with a six-carbon ring (benzene-like) and three additional carbons.
  - The quaternary carbon could be part of the aromatic ring, and the carbon with a single hydrogen could be connected to the ring and the methyl group.
  - Based on this information, a possible structure is 1-methyl-3-propylbenzene.

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The fabric that is dyed with American flag red that displayed the most vivid color is the cotton fabric. This is due to the fact that cotton has a high affinity for the dye molecules. The fabric also has a strong and large intermolecular force that helps in binding with the dye molecules. This strong intermolecular force increases the depth of color for the cotton fabric.  

Intermolecular forces are forces that exist between molecules or atoms. These forces govern the physical properties of matter. The types of intermolecular forces are dipole-dipole forces, hydrogen bonds, van der Waals forces, ion-dipole forces, and London dispersion forces.

These forces are weak and are caused by temporary dipoles that are created in the molecules.

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The molarity of the solution when  9.27 g of phosphoric acid is added to water which had a volume of 92.80 ml is 1.02 M.

The molarity of the solution containing 9.27 g of phosphoric acid in 92.80 ml of water can be calculated as follows

Mass of phosphoric acid (H3PO4) = 9.27 g

Volume of solution = 92.80 mL

Convert volume of the solution to litres = 92.80 mL / 1000 = 0.0928 L

The molar mass of H3PO4 is:

Molar mass of H = 1.0079 g/mol

Molar mass of P = 30.9738 g/mol

Molar mass of O = 15.9994 g/mol

So, the molecular mass of H3PO4 = 3 × 1.0079 + 1 × 30.9738 + 4 × 15.9994= 98.0 g/mol

Now, Molarity (M) of the solution can be calculated by the formula:

M = mass of solute ÷ molar mass of solute × volume of solution in litres

Putting the values of mass, molar mass and volume of the solution in the above formula, we get:

M = (9.27 g ÷ 98.0 g/mol) ÷ 0.0928 L= 1.02 M

The molarity of the solution is 1.02 M.

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Answer: An electric current

Explanation:

As there is magnetic effect of electric current i.e when there is an electric current passing through any conductor then is produces a magnetic field around it depending on its shape. so due to magnetic field and a current there will be a magnetic force applied.  

Answer:

To answer this question, we first need to write the balanced chemical equation for the reaction between sodium carbonate and calcium chloride:

Na2CO3 + CaCl2 → 2NaCl + CaCO3

From the equation, we see that 1 mole of sodium carbonate reacts with 1 mole of calcium chloride to produce 1 mole of calcium carbonate and 2 moles of sodium chloride.

Therefore, since we have an excess amount of calcium chloride, we can assume that all 5.32 moles of sodium carbonate react completely to produce 10.64 moles of sodium chloride.

So the answer is: 10.64 moles of salt (sodium chloride) are produced.

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A fuel cell is an electrochemical device that converts chemical energy from a fuel (such as hydrogen) and an oxidizing agent (such as oxygen) into electrical energy, water, and heat.

What is Fuel?

Fuel is a material that is burned or processed to release energy in the form of heat or to produce work. Common examples of fuel include coal, natural gas, gasoline, diesel, and wood. The energy contained within the fuel is released through a chemical reaction, usually with oxygen, to produce heat, light, or other forms of energy. Fuel is used to power a wide range of machinery and devices, including vehicles, power plants, and heating systems.

The reactants (fuel and oxidizing agent) are supplied to the cell, where they undergo a chemical reaction in the presence of a catalyst, producing electricity and the byproduct water.

According to the law of conservation of mass, mass cannot be created or destroyed in a chemical reaction. In the case of a fuel cell, the mass of the reactants (fuel and oxidizing agent) is equal to the mass of the products (water) plus the mass of the electricity produced

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Answer: 68.5826%

Explanation:

The pH of the solution after 0.028 moles of Ba(OH)2 are added to 0.62L of the buffer solution containing 0.18M of base B and 0.48M of its conjugate acid BH is 8.89. To calculate the pH, you need to use the Henderson-Hasselbalch equation: pH = pKa + log ([B]/[BH]).

First, calculate the total moles of B and BH by adding 0.028 moles of Ba(OH)2 to 0.62L of the original buffer solution, then use the equation to calculate the pH. Here are the steps:

1. Calculate the total moles of B and BH after 0.028 moles of Ba(OH)2 are added.

Total moles of B = 0.18 + (0.028 / 2) = 0.194

Total moles of BH = 0.48 + (0.028 / 2) = 0.508

2. Calculate the pH using the Henderson-Hasselbalch equation.

pH = pKa + log ([B]/[BH])

pH = 8.91 + log (0.194/0.508)

pH = 8.89

Therefore, the pH of the solution after 0.028 moles of Ba(OH)

are added to 0.62L of the buffer solution is 8.89.

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Answer:

It is correct.

Explanation:

The statement “sodium reacts with chlorine to form sodium chloride” is correct.

Sodium and chlorine react to form sodium chloride, which is a type of salt. When sodium and chlorine combine, they form an ionic bond.

An ionic bond is a type of chemical bond that occurs when one atom donates an electron to another atom.

In this case, sodium donates an electron to chlorine, which results in the formation of sodium chloride.

The density of materials is influenced by the arrangement of their molecules and how well they can pack together. HDPE and LDPE have the same chemical composition, but their densities differ due to differences in their molecular structure.

HDPE has a more linear structure with fewer branches, while LDPE has a more branched structure with more branches. This branching reduces the ability of LDPE molecules to pack together as tightly as HDPE molecules, leading to a lower density for LDPE.

The density of a material can also influence its properties. HDPE, with its higher density, is generally stronger and more rigid than LDPE. It is also less flexible than LDPE, which can bend and deform more easily due to the branching in its molecular structure. LDPE, on the other hand, has better impact resistance than HDPE, meaning it can absorb more energy before breaking.

In addition, HDPE is more resistant to chemicals and has better temperature resistance than LDPE. However, LDPE is more resistant to stress cracking and is more easily processed due to its lower melting point.

In summary, the density of a material is influenced by its molecular structure and packing ability, which can in turn affect its strength, flexibility, and other material properties. HDPE and LDPE, despite having the same chemical composition, have different densities and properties due to differences in their molecular structures.

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As an AI, I will provide the best answer based on the given question and I will not exceed 200 words.The magnitude of the magnetic force experienced by proton 2 is less than the force experienced by proton 1. The explanation for this statement is option (a) Proton 1 experiences the greater force because it moves at right angles to the magnetic field.What is the Magnetic Force?

The force that is exerted on a charged particle that is moving in a magnetic field is referred to as the magnetic force. When a particle moves in a magnetic field, it experiences a force. This is due to the interaction between the magnetic field and the moving charge. In order to understand the effect of a magnetic field on a moving charged particle, it is necessary to first understand the nature of a magnetic field. Magnetic fields are caused by the motion of charged particles. These fields are invisible, but they can be detected with the help of a magnet.The magnetic force on a charge particle is given by:F=qvBsinθwhere,F is the magnetic force q is the charge of the particlev is the velocity of the particleB is the strength of the magnetic fieldθ is the angle between the velocity of the particle and the direction of the magnetic field.When the particle is moving perpendicular to the magnetic field, the angle between the velocity of the particle and the direction of the magnetic field is 90 degrees. The force acting on the particle is then maximum. If the particle moves parallel to the magnetic field, the angle between the velocity of the particle and the direction of the magnetic field is 0 degrees. The force acting on the particle is then zero.The magnitude of the magnetic force experienced by proton 2 is less than the force experienced by proton 1. This is because proton 2 moves in the same direction as the magnetic field, whereas proton 1 moves at right angles to the magnetic field. When a charged particle moves in the same direction as the magnetic field, it experiences very little magnetic force. Therefore, the magnitude of the magnetic force experienced by proton 2 is less than the force experienced by proton 1.

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Answer:

To solve this problem, we can use the combined gas law, which states that (P1 * V1) / T1 = (P2 * V2) / T2, where P is pressure, V is volume, and T is temperature in kelvins.

First, we need to convert the temperatures from Celsius to kelvins by adding 273.15. So -20°C is equivalent to 253.15 K and 90°C is equivalent to 363.15 K.

Plugging in the known values into the combined gas law formula, we get:

(760 * 48) / 253.15 = (740 * V2) / 363.15

Solving for V2, we find that the final volume of the hydrogen gas is approximately 53.7 L.