Claim-Evidence-Reasoning

Question: Does the diagramed chemical equation above obey the Law of
Conservation of Matter?

The standard entropy change for the reaction \(2Mg(s)+O_2(g)\rightarrow 2MgO(s)\) is -405.6 J/(K⋅mol).

Entropy is a measure of the randomness or disorder in a system. It is a thermodynamic property that can be used to measure the amount of energy that is unavailable for work in a thermodynamic process. Entropy is closely related to the second law of thermodynamics and can be used to assess the direction of a thermodynamic process. Entropy is also a measure of the amount of information contained in a system. High entropy systems have more randomness and disorder, while low entropy systems have less.

The entropy change for the reaction \(2Mg(s)+O_2(g) \rightarrow 2MgO(s)\) is calculated using the following equation: \(\Delta S^\circ = \Sigma S^\circ products -\Sigma S^\circ reactants\)

Substituting the values from the table:

\(\Delta S^\circ = (2 \times 27.00 J/(Kmol)) - (32.70 J/(Kmol) + 205.0 J/(Kmol))\\\Delta S^\circ = -405.6 J/(Kmol) .\)

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Answer:

acetone evaporates faster than hexane.

Explanation:

because acetone does nor participate in hydrogen bonding, so it's intermolecular forces are comparatively weaker, and it evaporates most quickly.

The explanation for this is that oxygen has a higher electronegativity and a greater attraction for its valence electrons compared to boron, carbon, and sodium. This means that it requires more energy to remove an electron from oxygen, resulting in the formation of a cation.

To determine which element requires the most energy to remove a valence electron, we need to consider ionization energy. Ionization energy is the energy required to remove an electron from an atom or ion. In general, ionization energy increases from left to right across a period and decreases from top to bottom within a group on the periodic table.

Locate the elements on the periodic table. Boron, Carbon, Oxygen, and Sodium are in groups 13, 14, 16, and 1, respectively. Observe the ionization energy trends. Since ionization energy increases from left to right across a period, Oxygen in group 16 will have a higher ionization energy than Boron, Carbon, and Sodium. Consider the vertical trend. Ionization energy decreases from top to bottom within a group, but since all these elements are in the same period, this trend is not relevant for this comparison.
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The molarity of a solution containing 37.0 g of ethanol (\(C_{2} H_5OH\)) in 600 mL approximately 1.34 M.

Convert the given mass of ethanol to moles. The molar mass of ethanol is 46.07 g/mol.

First, we calculate the moles of ethanol by dividing the mass by the molar mass:

moles of ethanol = 37.0 g / 46.07 g/mol ≈ 0.803 mol.

Next, we convert the volume of the solution from milliliters (mL) to liters (L). Since 1 L = 1000 mL, the volume of the solution is 600 mL / 1000 mL/L = 0.600 L.

Finally, we calculate the molarity by dividing the moles of ethanol by the volume of the solution:

molarity = moles of ethanol / volume of solution in liters = 0.803 mol / 0.600 L ≈ 1.34 M.

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Answer:

of zinc sulfide:

0.382 moles ZnS * 97.45 g/mol = 37.4 g ZnS

To find the mass of the excess reactant (sulfur) that will remain after the reaction is complete, we need to subtract the mass of the product (zinc sulfide) from the mass of the excess reactant:

30.0 g sulfur - 37.4 g ZnS = -7.4 g excess sulfur

Since the mass of the excess reactant is negative, this means that the reaction will consume all of the sulfur and there will be none left over.

To summarize:

A. Zinc is the limiting reactant.

B. 37.4 g of ZnS will be formed.

C. There will be no excess sulfur left over after the reaction is complete.

Explanation:

5N force was applied to an object if 35 j of work was done and the object moved 7 m

A force is an effect that can alter an object motion according to physics and an object with mass can change its velocity or accelerate as a result force and also force is as push or pull and work done by the force on an object means assuming that direction of the force is parallel to the displacement of the object

Then the formula is

W = f × d

Where f is the magnitude of force and d is the displacement of the object

Then W = 35 J is the work done and

d = 7m is the displacement of the object

So rearrange the equation then

F = 35/7 = 5N

5N force was applied to an object if 35 j of work was done and the object moved 7 m

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The nucleus, which has a positive charge, is the center of an atom. The nucleus of an atom contains almost all of its mass, and the electrons orbit the nucleus in precise ways.

DNA is organized into chromosomes and is located in the nucleus, which is in the center of each cell. A double nuclear membrane (outer and inner) that separates the cytoplasm from the nucleus is called the nuclear envelope, which encircles the cell. The nucleus houses the genes, structures that hold the hereditary information, and regulates and controls the functions of the cell (such as growth and metabolism). In the nucleus, nucleoli, which are tiny bodies, are frequently seen. Nucleoplasm is the matrix that resembles a gel and contains the various nuclear parts.

The nucleus of a cell is made up of chromosomes, nucleoplasm, nucleolus, and a nuclear membrane known as the nuclear envelope. The matrix that exists within the nucleus is referred to as nucleoplasm, also known as karyoplasm. The cytoplasm and the nucleus' components are separated by the nuclear membrane.

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The main reservoirs of the carbon cycle are the atmosphere, oceans, land (including vegetation and soils), and fossil fuels. In these reservoirs, carbon exists in both inorganic and organic forms.

The inorganic carbon cycle involves the exchange of carbon dioxide (CO2) between the atmosphere and oceans through processes like photosynthesis and respiration.

Organic carbon, on the other hand, is found in living organisms, dead organic matter, and soil organic matter. It is cycled through processes such as decomposition and consumption by organisms. The interactions between the inorganic and organic carbon cycles occur primarily in the biosphere, where photosynthesis converts inorganic carbon into organic carbon compounds. While inorganic carbon is primarily in the form of CO2, organic carbon is present in complex organic molecules. Both forms of carbon play crucial roles in energy transfer, nutrient cycling, and climate regulation.

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Answer:

A

Explanation:

Your answer would be A because Earth is formed from cold gases collapsing due to gravity. The Solar System was formed when a huge amount of dust and gas began to collapse under its own gravity, and as the cloud collapse it started to spin causing the material within the cloud to gather into a swirl and then formed into planets and as the planets are formed they kept this spinning motion.

Answer:

it’s D.The cake is formed by a chemical change and the icing is formed by a physical change

Explanation:

It’s because when the cake was baking there was nothing physical about it so it was a chemical change the icing is formed by a physical change because all you did was mix three ingredients together

The type of changes that created the cake and the icing is;

Option D; The cake is formed by a chemical change and the icing is formed by a physical change.

This is about understanding type of changes in chemistry.

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Answer:25grams

Explanation: the mass stays the same even when it changes form

The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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To solve this we must be knowing each and every concept related to  lymph node. Therefore, the correct option is option D among all the given options.

A lymph node, sometimes known as a lymphatic gland, is indeed a kidney-shaped lymphatic and immune system component. The lymphatic veins connect a massive amount of lymph nodes to one another throughout the body.

Most lymph nodes lie within the trunk adjacent to other major structures in the body - such as the paraaortic lymph nodes and the tracheobronchial lymph nodes. The lymphatic drainage patterns are different from person to person and even asymmetrical on each side of the same body. Bacteria and dead cells are removed from circulatory fluid in the lymph nodes.

Therefore, the correct option is option D.

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Answer: B: a solvent

Explanation: I hope this helps!

The correct option from the given statements concerning mixtures is (d) more than one correct response.

The statement (a) "The composition of a homogeneous mixture cannot vary" is incorrect as the composition of a homogeneous mixture can vary. For example, a mixture of salt and water is homogeneous and its composition can vary depending on the amount of salt and water mixed in it.

The statement (b) "A homogeneous mixture can have components present in two physical states" is correct. Homogeneous mixtures are mixtures that are uniform throughout their composition, meaning that there is no visible difference between the components of the mixture. For example, a mixture of ethanol and water is homogeneous and its components are present in two physical states (liquid and liquid).

The statement (c) "A heterogeneous mixture containing only one phase is an impossibility" is incorrect. A heterogeneous mixture is a mixture where the components are not evenly distributed and the mixture has different visible regions or phases. However, it is possible for a heterogeneous mixture to contain only one phase. For example, a mixture of oil and water is heterogeneous but can have only one phase.

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Answer:

option first is the right answer

The amount of electrical work (per mole) obtained from burning liquid methanol is 666.0 kJ/mol.

What is electrical work?

Electric charges flow across a potential difference or voltage during electrical work, labor carried out by or on an electrical system.

a) The balanced chemical equation for the reaction is:

2CH₃OH(l) + 3O₂(g) → 2CO₂(g) + 4H₂O(l)

b) The maximum amount of electrical work that may be produced by burning one mole of liquid methanol can be estimated as the reaction's negative Gibbs free energy change, which is given by:

ΔG = ΔH - TΔS

ΔH = enthalpy change of the reaction,

ΔS =entropy change of the reaction,

T = temperature in Kelvin.

The standard formation enthalpies of the reactants and products can be used to calculate the reaction's enthalpy change:ΔH°f(CH3OH,l) = -239.1 kJ/mol

ΔH°f(\(CO_{2}\),g) = -393.5 kJ/mol

ΔH°f(\(H_{2}O\),l) = -285.8 kJ/mol

The enthalpy change of the reaction is, therefore:

ΔH = [ΔH°f(\(CO_{2}\),g) + 2ΔH°f(\(H_{2} O\),l)] - [ΔH°f(\(CH_{3}OH\),l) + 1.5ΔH°f(\(O_{2}\),g)]

ΔH = [-393.5 kJ/mol + 2(-285.8 kJ/mol)] - [-239.1 kJ/mol + 1.5(0 kJ/mol)]

ΔH = -726.3 kJ/mol

The standard entropies of the reactants and products can be used to determine the reaction's entropy change:

ΔS°f(\(CH_{3}OH\),l) = 126.8 J/mol·K

ΔS°f(\(CO_{2}\),g) = 213.6 J/mol·K

ΔS°f(\(H_{2}O\),l) = 69.9 J/mol·K

ΔS°f(\(O_{2}\),g) = 205.0 J/mol·K

The entropy change of the reaction is, therefore:

ΔS = [ΔS°f(\(CO_{2}\),g) + 2ΔS°f(\(H_{2}O\),l)] - [ΔS°f(\(CH_{3}OH\),l) + 1.5ΔS°f(\(O_{2\\\),g)]

ΔS = [213.6 J/mol·K + 2(69.9 J/mol·K)] - [126.8 J/mol·K + 1.5(205.0 J/mol·K)]

ΔS = -201.7 J/mol·K

Assuming T1 = 298 K, the maximum amount of electrical work that can be obtained from burning one mole of liquid methanol is:

ΔG = ΔH - T1ΔS

ΔG = -726.3 kJ/mol - 298 K(-201.7 J/mol·K)

ΔG = -726.3 kJ/mol + 60.3 kJ/mol

ΔG = -666.0 kJ/mol

Therefore, at 298 K and 1 bar, one mole of liquid methanol can burn for a maximum of 666.0 kJ/mol of electrical work.

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The balanced chemical equation for the reaction of liquid methanol and gaseous oxygen is \(2 \mathrm{CH_3OH} (\ell) + 3 \mathrm{O_2} (\mathrm{g}) \rightarrow 2 \mathrm{CO_2} (\mathrm{g}) + 4 \mathrm{H_2O} (\ell)\). The reaction releases a large amount of energy, but cannot occur spontaneously and requires an input of energy.

a) The balanced chemical equation for the reaction of liquid methanol and gaseous oxygen is:

\(2 \mathrm{CH_3OH} (\ell) + 3 \mathrm{O_2} (\mathrm{g}) \rightarrow 2 \mathrm{CO_2} (\mathrm{g}) + 4 \mathrm{H_2O} (\ell)\)

b) To calculate the amount of electrical work that can be obtained from burning liquid methanol, we need to determine the change in Gibbs free energy (ΔG) of the reaction. This can be calculated using the standard Gibbs free energy change (ΔG°) and the reaction quotient (Q):

ΔG = ΔG° + RTln(Q)

where R is the gas constant, T is the temperature in Kelvin, and ln(Q) is the natural logarithm of the reaction quotient.

Assuming standard conditions (298 K and 1 bar), we can use tabulated values of standard Gibbs free energy of formation (ΔG°f) to calculate ΔG° for the reaction:

\($\Delta G^\circ = \sum n \Delta G^\circ_\mathrm{f}(products) - \sum m \Delta G^\circ_\mathrm{f}(reactants)$\)

\($\Delta G^\circ = [2\Delta G^\circ_\mathrm{f}(CO_2) + 4\Delta G^\circ_\mathrm{f}(H_2O)] - [2\Delta G^\circ_\mathrm{f}(CH_3OH) + 3\Delta G^\circ_\mathrm{f}(O_2)]$\)

\($\Delta G^\circ = [-394.4\ \mathrm{kJ/mol} + 4(-285.8\ \mathrm{kJ/mol})] - [-238.8\ \mathrm{kJ/mol} + 3(0\ \mathrm{kJ/mol})]$\)

\($\Delta G^\circ = -726.4\ \mathrm{kJ/mol}$\)

The reaction quotient Q can be calculated from the initial and final concentrations of the reactants and products. Since we are assuming complete combustion, the initial concentration of methanol is equal to the amount of methanol we are burning, which is 1 mole. The final concentrations of the products can be calculated using the stoichiometry of the balanced equation. At equilibrium, Q = Kc, where Kc is the equilibrium constant for the reaction. For complete combustion, the value of Kc is very large, as the reaction goes essentially to completion. Thus, we can consider that Q ≈ ∞and the natural logarithm of Q is then infinity:

ln(Q) ≈ ln(∞) = ∞

Substituting the values into the equation for ΔG, we get:

ΔG = ΔG° + RTln(Q)

ΔG = -726.4 kJ/mol + (8.314 J/mol*K) * (298 K) * ln(∞)

ΔG ≈ -∞

The negative value of ΔG indicates that the reaction is exergonic, meaning it releases energy. However, the value of ΔG is so large that the reaction cannot occur spontaneously. In other words, the reaction requires an input of energy to occur, which means that it cannot be used to obtain electrical work. The balanced chemical equation for the reaction of liquid methanol and gaseous oxygen is \(2 \mathrm{CH_3OH} (\ell) + 3 \mathrm{O_2} (\mathrm{g}) \rightarrow 2 \mathrm{CO_2} (\mathrm{g}) + 4 \mathrm{H_2O} (\ell)\).

To obtain electrical work from the combustion of liquid methanol, we need to use a fuel cell or a combustion engine, which can harness the energy released by the reaction to generate electricity. The amount of electrical work that can be obtained will depend on the efficiency of the device used and may be less than the total amount of energy released by the reaction.

The balanced chemical equation for the reaction of liquid methanol and gaseous oxygen is \(2 \mathrm{CH_3OH} (\ell) + 3 \mathrm{O_2} (\mathrm{g}) \rightarrow 2 \mathrm{CO_2} (\mathrm{g}) + 4 \mathrm{H_2O} (\ell)\). The reaction releases a large amount of energy, but cannot occur spontaneously and requires an input of energy.

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Answer:

Give them each one so all of you is 8

Explanation:

I hope it helps:)

Fred and Florence have a combined total of 14 markers. Meaning, the amount of markers between all three is 24. If Maggie gives one marker to Fred and one marker to Florence, then each of them will have 8 markers.

Answer:

Explanation:

In general, metals will lose electrons to become a positive cation and nonmetals will gain electrons to become a negative anion. Hydrogen is an exception, as it will usually lose its electron. Metalloids and some metals can be can lose or gain electrons.

Answer:

Explanation:

Synthetic fibres are made using chemicals. Hence they do not require any forest resources like wood. This helps in saving the trees from cutting down. So the production of synthetic fibers helps in the conservation of forests.

Natural fibres on the other hand require forest products like wood for its manufacture.

Hope this helps

plz mark it as brainliest!!!!!!!!!

Answer:

yes, they do help in conservating the forest resources.

Explanation: This is because synthetic fibers like rayon, nylon etc are made from petrochemicals which helps to substitute usage of natural resources like cotton etc. and these synthetic fibers are more durable than natural fibers, which adds to their usage and in turn, helps to conserve forest resources.

The pH of the buffer solution given in the flask containing 2.838 m formic acid and 1.913 m Formate anion is 3.56.

The pH of a buffer solution can be calculated using the Henderson-Hasselbalch equation:

pH = pKa + log([A⁻]/[HA])

where pKa is the acid dissociation constant of formic acid (HCOOH) which is 1.85x10⁻⁴ at 298 K1, [A⁻] is the concentration of Formate anion (HCOO⁻) and [HA] is the concentration of formic acid (HCOOH).

The molarity of formic acid in the flask is 2.838 M and that of Formate anion is 1.913 M.

Since these two chemicals are a conjugate acid/base pair that should be able to form a buffer, we can assume that all of the formic acid will dissociate into H⁺ and HCOO⁻ ions.

Therefore,

[HCOO⁻] = 1.913 M and

[H⁺] = 1.85x10⁻⁴ × 2.838 / 1.913

= 2.75 x 10⁻⁴ M.

Taking -log[H⁺] gives us pH:

= -log(2.75 x 10⁻⁴) = 3.56.

Therefore, the pH of the solution in this flask is 3.56.

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Answer:

Diffusion is the movement of particles from an area of high concentration to an area of low concentration.

Explanation:

Answer:

Mostly Kinetic

Explanation:

Answer: True

Explanation:

It is true because Voltage-gated sodium channels are ion channels found in the membranes of neurons, specifically at the initial segment or axon hillock. These channels are responsible for generating and propagating action potentials, which are electrical signals that allow neurons to communicate with each other.

A greater volume of acid will be needed to neutralize the sodium hydroxide thereby making the calculated concentration of acid for the second trial to decrease.

Titration is usually a way of determining the concentration of an unknown solution by accurately measuring the volume of a known solution that reacts completely with the unknown solution.

The point when reaction is completed is indicated by the end point of the reaction. If more base (sodium hydroxide) is added to the flask, then more volume of acid will be needed to neutralize it thereby making the calculated concentration of acid for the second trial to decrease.

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Approximately 12.45 grams of solid silver chromate will precipitate when 150 mL of 0.500 M silver nitrate solution is added to excess potassium chromate.

To determine the number of moles of AgNO3 present in 150 mL of a 0.500 M AgNO3 solution, we can use the formula:

moles = concentration × volume

Given:

Concentration of AgNO3 solution = 0.500 M

Volume of AgNO3 solution = 150 mL

First, we need to convert the volume from milliliters (mL) to liters (L) since the concentration is given in moles per liter (M).

1 L = 1000 mL

Therefore, the volume of the AgNO3 solution in liters is:

150 mL × (1 L / 1000 mL) = 0.150 L

Now we can calculate the moles of AgNO3 using the formula:

moles = concentration × volume

moles = 0.500 M × 0.150 L

moles = 0.075 mol

So, there are 0.075 moles of AgNO3 present in 150 mL of the 0.500 M AgNO3 solution.

Now, let's proceed to determine how many grams of solid silver chromate (Ag2CrO4) will precipitate when the AgNO3 solution reacts with excess potassium chromate (K2CrO4).

From the balanced chemical equation:

2AgNO3(aq) + K2CrO4(aq) → Ag2CrO4(s) + 2KNO3(aq)

We can see that the molar ratio between AgNO3 and Ag2CrO4 is 2:1. Therefore, for every 2 moles of AgNO3, we will form 1 mole of Ag2CrO4.

Since we have 0.075 moles of AgNO3, we can calculate the moles of Ag2CrO4 formed:

moles of Ag2CrO4 = 0.075 mol / 2 = 0.0375 mol

To determine the mass of Ag2CrO4, we need to multiply the moles by its molar mass. The molar mass of Ag2CrO4 is calculated by summing the atomic masses of each element in the compound:

Ag2CrO4 = 2(Ag) + 1(Cr) + 4(O) = 2(107.87 g/mol) + 1(52.00 g/mol) + 4(16.00 g/mol) = 331.87 g/mol

mass of Ag2CrO4 = moles of Ag2CrO4 × molar mass of Ag2CrO4

mass of Ag2CrO4 = 0.0375 mol × 331.87 g/mol = 12.45 g

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Explanation:

Physical change can observe by physical appearance

OA = No change in color

other choices are chemistry change

Answer: They are magnetic lines and these lines depict the invisible magnetic field around the magnet! Hope this helps I got it right on my quiz :)

Explanation:

Answer:

about 12 cm

Explanation:

Considering the frequency of 2,450 MHz, the wavelength of microwave oven radiation is about 12 cm and the quantum energy of a microwave photon is about 1 x 10-5 eV.

The experimental approach used to analyze the metal content in the precipitate of soap produced by reaction 1 was 0.1 M HCl(aq), then titrated with standard 0.1 M NaOH(aq) using an indicator.

Soap precipitate is a salt of a weak base. The addition of HCl produces free fatty acids, which can then be neutralized with NaOH. The difference between the number of moles of HCl and NaOH required to reach the endpoint gives the number of moles of RCO₂, which can then be used to calculate the mass and percent of the metal in the solid.

Complete questions:

Which experimental approach can be used to analyze the metal content of the soapy precipitate produced by Reaction 1?

M₂+(aq) + 2NaC₁₇H₃₂CO₂(aq) → 2Na+(aq) + M(C₁₇H₃₂CO₂)₂(s)

Dissolve the solid in a known volume of:

The true choice is D

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