Which instrument is used to measure mass?

Answer:

4

Explanation

i just know the answer

Δ'∘ for the reaction is approximately -1.1 kJ/mol.

Δ for the reaction is approximately -1.69 kJ/mol.

The initial concentrations of reactant and product being 1 M is not consistent with the conditions at which Δ'∘ is measured, as the concentrations used for the calculation are different (1.2 M and 0.65 M).

To determine the values of Δ'∘ and Δ for the given interconversion reaction, we need to use the equation:

Δ'∘ = -RT ln(K'eq)

Where:

Δ'∘ is the standard Gibbs free energy change for the reaction at 25 °C,

R is the gas constant (8.314 J/(mol·K)),

T is the temperature in Kelvin,

ln represents the natural logarithm,

K'eq is the equilibrium constant at the given temperature.

Given that K'eq is 1.97, we can calculate Δ'∘ as follows:

Δ'∘ = -(8.314 J/(mol·K))(298 K) ln(1.97)

Δ'∘ ≈ -1.1 kJ/mol

Therefore, Δ'∘ for the reaction is approximately -1.1 kJ/mol.

To calculate Δ, the Gibbs free energy change under the given conditions with adjusted concentrations, we can use the equation:

Δ = Δ'∘ + RT ln(Q)

Where:

Δ is the Gibbs free energy change,

Δ'∘ is the standard Gibbs free energy change (previously calculated),

R is the gas constant (8.314 J/(mol·K)),

T is the temperature in Kelvin,

ln represents the natural logarithm,

Q is the reaction quotient.

Given the concentrations of fructose 6-phosphate (1.2 M) and glucose 6-phosphate (0.65 M), the reaction quotient (Q) is:

Q = ([glucose 6-phosphate]^n)/([fructose 6-phosphate]^m)

Q = (0.65 M)^1 / (1.2 M)^1

Q ≈ 0.54

Now, we can calculate Δ using the equation:

Δ = -1.1 kJ/mol + (8.314 J/(mol·K))(298 K) ln(0.54)

Δ ≈ -1.1 kJ/mol - 0.59 kJ/mol

Δ ≈ -1.69 kJ/mol

Therefore, Δ for the reaction is approximately -1.69 kJ/mol.

Among the given statements, the ones that are consistent with the conditions at which Δ'∘ is measured are:

The temperature is 273 K.

The pH is 7.

The pressure is 101.3 kPa (1 atm).

The initial concentrations of reactant and product being 1 M is not consistent with the conditions at which Δ'∘ is measured, as the concentrations used for the calculation are different (1.2 M and 0.65 M).

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The electrical force exerted by the comb on the piece of paper is about 5.84N.

We arrive at the answer by applying a basic law in the field of electrostatics, known as Coulomb's Law.

Coulomb's Law states two postulates about the electrostatic forces between bodies.

1. The Force between two charged bodies or particles is directly proportional to the product of the magnitude of charges.

  F ∝ |Q₁*Q₂|

2. The same force is also inversely proportional to the square of the distance between the bodies.

 F ∝ 1/R²

By combining the expression obtained through the postulates, we arrive at the following equation.

F = K(|Q₁*Q₂| / R²)

where K is called the electrostatic constant, equal to 9 * 10⁹ N·m²/C²

In the given question, if the piece of paper has also been polarized to the same amount of charge, it also holds a charge of 382nC. We can apply Coulomb's Law here to find the force between the comb and the paper.

F = 9 * 10⁹ * (382*382*10⁻¹⁸/15*15*10⁻⁶)

F = 9 *382²/225 *10⁻³

F = 5.836 N

Thus the force between the paper and the comb, mutually exerted on each other, is about 5.84N.

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Answer:

2.4 grams of H

Explanation:

Zn+2HCl=ZnCl2+H2

85gHCI x 1 mol HCI/36.458 g HCI x 1 mol H/2 mol HCI x 2.016 g H/1 mol H = 2.4 g H. (I know this is kinda hard to read, but I had the same question for my test and this is what I did to get 2.4. I hoped this helped)

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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Answer:

B and D

Explanation:

Burning fossil fuels is a major human activity that is responsible for the increasing amounts of atmospheric greenhouse gas, carbon dioxide.

When fossil fuels like coal, oil, and natural gas are burned to produce energy for transportation, heating, and electricity, carbon dioxide is released into the atmosphere. This carbon dioxide traps heat from the sun in the Earth's atmosphere, contributing to the greenhouse effect and global climate change. Other human activities like deforestation and agriculture also contribute to the increasing levels of atmospheric carbon dioxide by reducing the number of trees and plants that absorb carbon dioxide through photosynthesis.

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To calculate the volume of concentrated hydrochloric acid needed, we can use the formula:

Volume = Mass / Density

Given:
Mass = 45.17 g
Density = 1.19 g/mL

Let's calculate the volume:

Volume = 45.17 g / 1.19 g/mL
Volume ≈ 37.90 mL

Since the volume is given in milliliters (mL), we can convert it to cubic centimeters (cm^3) because they are equivalent:
Volume = 37.90 mL = 37.90 cm^3
Therefore, approximately 37.90 cm^3 of concentrated hydrochloric acid should be used for the experiment.experiment.

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The hybridization change that occurs for phosphorus in the reaction PCl3 + Cl2 → PCl5 is sp3 → sp3d.The hybridization change that occurs for phosphorus in the reaction PCl3 + Cl2 → PCl5 is sp3 → sp3d.PCl3 + Cl2 → PCl5The above reaction is a balanced chemical equation.

The phosphorus (P) atom in PCl3 has a hybridization of sp3, whereas the Cl2 molecule has a hybridization of sp2. During the formation of PCl5, there is a hybridization change in the phosphorus atom from sp3 to sp3d.A change in the hybridization of an atom occurs when it is involved in a chemical reaction. The changes in hybridization occur due to the difference in electronegativity of the atoms in the reactants or due to the bond formation.

For instance, in the reaction PCl3 + Cl2 → PCl5, the reaction occurs due to the formation of a covalent bond between the P atom in PCl3 and Cl atom in Cl2. This causes the electrons in the 3p subshell of the P atom to undergo excitation, resulting in the hybridization change from sp3 to sp3d.Hence, the correct answer is sp3 → sp3d.

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The pair of elements which are non-metals and at the same time; gases at room temperature and normal atmospheric pressure are as follows:

N2, O2, He, Ar

An element is a substance which cannot be split into simpler units by any ordinary process.

Some few examples of elements include:

Hydrogen

Helium

Lithium

Beryllium

Boron

Carbon

Nitrogen

Oxygen

Fluorine

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Explanation:

I hope it helps

ya welcome

Answer:

Ionic solid.

Explanation:

Ionic solid dissociated into free ions capable of conducting electricity in aqueous solution. Ionic solids are also characterised by high melting point due to strong ionic bonds. No free ions or electrons to conduct electricity in solid form.

The substance conducts electricity when dissolved in water, but does not conduct electricity in the solid phase and will be most likely an ionic solid. Therefore, option (A) is correct.

Ionic solids can be described as made of lattices of alternating ions. They are not close-packed structures because they like ions would have to touch. Ionic solids are commonly insulators because electrons are tightly held to the ions. They have high melting points due to strong ionic bonds

Due to the strong attractive forces between ions in ionic solids, they have high melting and boiling points. An ionic compound can conduct electricity in water and when it is melted.

In solution, the ions of the ionic solids are free to move and can conduct an electrical charge. The molten state also gives freedom of movement for the ions to conduct while Ionic solids are good insulators.

The ions in the solid cannot move due to the strong attractive forces between oppositely charged ions and, therefore, they do not conduct electricity well.

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Answer:

NO will be the limiting reagent.

Explanation:

The balanced equation is:

2 NO + 2 CO → N₂ + 2 CO₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

Being the molar mass of each compound:

Then by stoichiometry the following quantities of mass participate in each reaction:

The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.

To determine the limiting reagent, you can use a simple rule of three as follows: If 56 grams of CO react with 60 grams of NO, 3 grams of CO react with how much mass of NO?

\(mass of NO=\frac{3 grams of CO*60 grams of NO}{56 grams of CO}\)

mass of NO= 3.21 grams

But 3.21 grams of NO are not available, 3 grams are available. Since you have less moles than you need to react with 3 grams of CO, NO will be the limiting reagent.

6.23L volume of h2 gas is produced at stp.

Given that one mole of dihydrogen (H2) weighs 2,0159 g/mol, the experimental density of hydrogen—which is 0,0899 g/L at 0 °C and 0,0837 g/L at 20 °C—can be used to compute the exact molar volume of hydrogen.

This implies that at STP, one mole of hydrogen also takes up 22.4 liters of space. Therefore, at STP, 10moles of hydrogen gas will take up =22.410=224litres of space. In other words, when 460g of salt combines with extra water at STP, 224litres (or 224000mL) of hydrogen gas are released.

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the question you are looking for is

A 5.00 g sample of Al reacts with excess H2SO4. What volume of H2 gas is produced at STP?

2Al(s) + 3H2SO4(aq)→ Al2(SO4)3(aq) + 3H2 (g)

Answer:

B. Increase the mass of one of the objects.

E. Decrease the distance between the objects.

Explanation:

To effect an increase in the gravitational force between two objects, the mass of both objects should be increased and the distance between them reduced.

This is derived from the Newton's law of universal gravitation:

Therefore, if the mass of the two bodies are increased and the distance between them reduced, the gravitational force of attraction will increase.

Answer:

E. Decrease the distance between the objects

B. Increase the mass of one of the objects

Explanation:

The moles of electrons that may be transferred by a primary battery are: unrelated to its size.The voltage output is unaffected by the battery's size.

Option D is correct .

An essential battery or essential cell is a battery (a galvanic cell) that is intended to be utilized once and disposed of, and not re-energized with power and reused like an optional cell (battery-powered battery). A primary battery, also known as a primary cell, is not designed to be recharged with electricity and repurposed like a secondary cell. Instead, it is intended to be used once and then discarded. The cell cannot be recharged because the electrochemical reaction it is undergoing is generally irreversible.

High unambiguous energy, long capacity times and moment status give essential batteries a special benefit over other power sources.

Incomplete question :

The moles of electrons that may be transferred by a primary battery are: Select the correct answer below:

A. directly proportional to its size

B. inversely proportional to its size

C. directly proportional to the square of its size

D. unrelated to its size

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Answer:

Nonpolar molecules

Explanation:

Answer:

Using the combined gas law:

(P1 x V1) / T1 = (P2 x V2) / T2

where:

P1 = 34.5 psi (initial pressure)

V1 = 32.2 L (initial volume)

T1 = 27°C + 273.15 = 300.15 K (initial temperature in Kelvin)

V2 = 31.04 L (final volume)

T2 = 43°C + 273.15 = 316.15 K (final temperature in Kelvin)

Solving for P2:

(P1 x V1 x T2) / (V2 x T1) = P2

(34.5 psi x 32.2 L x 316.15 K) / (31.04 L x 300.15 K) = P2

P2 = 37.2 psi

Therefore, the new pressure in the tire is 37.2 psi when the temperature increases to 43°C and the volume decreases to 31.04 L.

Answer: i think its (b) be abundant in the crust

Explanation:

Starting with solid argon at room temperature, we need to cool it to -189.2 c to convert it into the liquid state.

Then, we need to heat it slightly till it reaches a temperature of -185.7 c. At this temperature, the liquid argon will convert into gaseous argon.

There are three states of matter i.e, solid state, liquid state, and gaseous state. These states are interconvertible which means that we can convert a substance from one state to another.

The conversion from solid to liquid and then gas or vice versa happens at specific temperatures that are known as boiling point, melting point, freezing point, etc.

The melting point is the temperature at which a solid gets converted into a liquid.

The boiling point is the temperature at which a liquid gets converted into a gas.

The melting and boiling points of Argon are -189.2 °C and -185.7 °C respectively.

Thus, starting with solid argon at room temperature, we need to cool it to   -189.2 °C to convert it into the liquid state.

Then, we need to heat it slightly till it reaches a temperature of -185.7 °C. At this temperature, the liquid argon will convert into gaseous argon.

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Answer:

it is c

Explanation:

because it deals with living organisms and with water

Answer:

Electricity

Moving electrons are known as electric current, also known as Electricity.

Answer:

Father of the Constitution

Explanation:

Answer:

C triple

Explanation:

please crown me

Answer:

C

Explanation:

Answer:

The answer is Depositing one metal on another

Explanation:

Depositing one metal on another best describes electroplating. Hence, option B is correct.

"Electroplating is a process that uses an electric current to reduce dissolved metal cations so that they form a thin coherent metal coating on an electrode."

An electroplating process is the electroplating of copper in which the metal to be plated (copper) is used as the anode, and the electrolyte solution contains the ion of the metal to be plated (Cu2+). Copper in the solution at the anode and is plated at the cathode.

Electroplating is primarily used to change the physical properties of the materials. This process can be used to give materials increased wear resistance, corrosion protection or aesthetic appeal, as well as increased thickness.

Hence, depositing one metal on another best describes electroplating.

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Its average binding energy per nucleon is also higher than that of C-12.

O-16 has a higher average binding energy per nucleon.

The average binding energy per nucleon can be calculated using the formula:

average binding energy per nucleon = (total binding energy) / (total number of nucleons)

The total binding energy of a nucleus is related to its mass defect, which is the difference between its actual mass and the sum of the masses of its constituent protons and neutrons.

The mass defect is a measure of the energy that is released when the nucleus is formed from its constituent particles.

Since O-16 has a larger mass defect than C-12, it has a higher total binding energy. Therefore, its average binding energy per nucleon is also higher than that of C-12.

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