Is this a redox reaction? give evidence (many points plz answer)
2Mg + CO2 → 2MgO + C

Answer:

C, Reactants rearrange to form new products

Explanation:

Answer:65

Explanation:

The mass of \(Al_{2} S_{3}\) produced is 15.616 grams.

The reaction taking place is as follows:

\(2Al+ 3S\) →\(Al_{2} S_{3} (s)\)

Moles of Al = mass/molar mass = 10.0g/27.0g/mol

= 0.370 mol

Moles of S = mass/molar mass = 15.0g/(32.065g/mol)

= 0.468 mol

Al and S reacts in the molar ratio of 2:3.

2 moles of Al reacts with 3 moles of S

0.370 moles of Al will react with S = (3/2)*0.370mol

= 0.555 mol

Similarly, 0.468 moles of S will react with Al = 2/3 *0.468mol

= 0.312 mol

Thus, Al is in excess and S is the limiting reactant (some of Al will be left over ,S will completely react)

So, moles of \(Al_{2} S_{3}\) produced=1/3*0.312 mol of S

= 0.104 mol

Mass of \(Al_{2} S_{3}\) produced = moles*molar mass of \(Al_{2} S_{3}\)

= 0.104mol*150.158g/mol

= 15.616 grams

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Answer:

68 plys 83

Explanation:

The molarity of the solution is 0.26 M (molar).

To calculate the molarity of a solution, we need to know the moles of solute and the volume of the solution in liters. Given that 3.5 grams of CuCl\(_{2}\) (copper(II) chloride) is dissolved in 100 mL (0.1 L) of water, we can convert the mass of CuCl\(_{2}\) to moles using its molar mass. The molar mass of CuCl\(_{2}\) is approximately 134.45 g/mol.

Using the formula

Moles = Mass / Molar Mass,  

We find that the moles of CuCl\(_{2}\) is 0.026 moles.

Now, we can calculate the molarity by dividing the moles of CuCl\(_{2}\) by the volume of the solution in liters.

Therefore, the molarity of the solution is 0.026 moles / 0.1 L = 0.26 M.

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Answer:

S

Explanation:

The symbol for entropy is S, and a change in entropy is shown as “delta” S or ΔS. If the entropy of a system increases, ΔS is positive. If the entropy of a system decreases, ΔS is negative.

The mass fraction of the pro eutectoid phase is approximately 0, and of the pearlite phase is approximately 1.

In iron-carbon alloy with 0.60 wt% carbon, the pro eutectoid phase is cementite (Fe₃C). To calculate the mass fractions of the pro eutectoid phase and the pearlite phase,  consider the eutectoid reaction.

Eutectoid reactions in iron-carbon alloys are usually found at a composition of approximately 0.76 wt% carbon. As the alloy in question contains 0.60 wt% carbon it is hypo-eutectoid (i.e., below the eutectoid composition).

The lever rule will be used to calculate this equation  as follows:

f₁ = \(\frac{C_{0} - C_{e} }{C_{1} - C_{e} }\)

where the values represent here :

f₁ = mass fraction of the pro eutectoid phase (cementite),

Cₒ =carbon content in the alloy (0.60 wt%),

Cₑ =eutectoid composition (0.76 wt%),

C₁ = carbon content in the cementite phase (6.70 wt% carbon).

After substituting the given values into the equation:

f₁ = \(\frac{0.60 - 0.76}{6.70 - 0.76} \\\)

f₁ = \(\frac{0.16}{5.94}\)

f₁ ≈ -0.027

Here the negative value of f₁ shows that there is no pro eutectoid phase present in the alloy. Rather, the entire alloy consists of the pearlite phase.

Hence ,  the mass fraction of the pro-eutectoid phase is approximately 0, and the mass fraction of the pearlite phase is approximately 1.

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Answer:

I think this is the right answer, I researched this. I am not sure if this is the right answer.

Lava flows rarely kill people because they move slowly enough for people to get out of their way. If magma is thick and sticky, gases cannot escape easily. Pressure builds up until the gases escape violently and explode. ... Explosive volcanic eruptions can be dangerous and deadly.

Explanation:

__________________________________

___________________________________

Answer:

I think it is D

Explanation:

because i did this one

Answer:

A

Explanation:

kinetic and mass are directly proportional

so if one increases the other does to

The relationship between the kinetic energy of an object and the mass of an object is Kinetic energy gets bigger at the same rate as the mass of an object.

The energy that an object has as a result of motion is known as kinetic energy. It is described as the effort required to move a mass-determined body from rest to the indicated velocity. The body keeps the kinetic energy it acquired throughout its acceleration unless its speed changes.

Potential energy can be moved into motion by a variety of catalysts, including gravity and chemical reactions, to release kinetic energy. As a result, kinetic energy rises and potential energy falls. Mechanical energy is the sum of all kinetic and potential energy.

The capacity to perform work is arguably the most significant characteristic of kinetic energy. Force acting on an object while it is moving is referred to as work. Energy and work are interchangeable because of their tight relationship.

Thus, option A is correct.

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Answer: 10y/s

Explanation:

Answer:

E = 3 × 10¹⁰ J

Explanation:

Mass, m = 100 kg

We need to find energy made by the loss of 100 kg of mass. The formula between the mass and energy is given by :

E = mc²

Where c is speed of light

Putting all the values, we get :

E = 100 kg × (3×10⁸ m/s)²

= 3 × 10¹⁰ J

So, the required energy is 3 × 10¹⁰ J.

Answer:

1.38 moles

Explanation:

My teacher gave us the answer on a quiz so here if y’all want a explanation I’ll give y’all one tho

Explanation:

Explanation:

THE EFFECT OF TEMPERATURE ON REACTION RATE Aimcloudyprecipitate of sulphurWord equation and symbolic equation:Na

When sodium thiosulphate solution reacts with hydrochloric acid, the reaction mixture goes due to the formation of a .

sodium thiosulphate + hydrochloric acid → sodium chloride + sulphur + sulphur dioxide + water

2S2O3(aq) + 2 HCl(aq) → 2 NaCl(aq) + S(s) + SO2(g) + H2O(l)

M_1V_1 = M_2V_2 Given ,Desired pH = 5.0pKa of acetic acid = 4.76Desired molarity = 0.1 M Volume = 600 ml are equal

Concentration of acid = [acid]Concentration of base = [base][base]/[acid] = 2.3[acid] = x[base] = 2.3xConcentration of acid and base should to 0.1 MM_1V_1 = M_2V_2M_1 = 0.1M of acetic acid or 0.1M sodium acetate (stock solution)V_1 = what to solve forM_2 = the value for [acid] or [base] solved in 4bV_2 = the desired buffer volume (600mL)Now, using the Henderson-Hasselbalch equation, we can calculate the ratio of base to acid:[base]/[acid] = 10^(pH - pKa) = 10^(5.0 - 4.76) = 1.67Solving for x and [base] using the equation x + 2.3x = 0.1, we get:x = [acid] = 0.026 M[base] = 2.3x = 0.060 MTo calculate

the volumes of acetic acid and sodium acetate required, we can use the formula:Molarity × Volume = Mass ÷ Molecular weight × 1000where 1000 is to convert the mass to milliliters.Mass of sodium acetate = Molecular weight × Volume × Molarity= 82.03 g/mol × 600 ml × 0.060 mol/L= 295.31 gMass of acetic acid = Molecular weight × Volume × Molarity= 60.05 g/mol × 600 ml × 0.026 mol/L= 95.52 gNow we know the masses of sodium acetate and acetic acid required. To make the buffer, we dissolve these masses in water and then add enough water to make the final volume 600 ml.

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The mass of Cu in 14.0 g of the alloy is 2.76 g.

To find the mass of Cu in 14.0 g of an alloy that is 16.6% Cu, we need to first calculate the total amount of Cu in the alloy.

Assuming we have 100 g of the alloy, the mass of Cu present in it would be:

Mass of Cu = 16.6% * 100 g = 16.6 g

So, the mass of Cu in 14.0 g of the alloy would be:

Mass of Cu = (14.0 g / 100 g) * 16.6 g = 2.76 g

As a result, the mass of Cu in 14.0 g of the alloy is 2.76 g.

The given alloy contains 16.6% Cu, which means that 100 g of the alloy contains 16.6 g of Cu. To find the mass of Cu in 14.0 g of the alloy, we need to calculate the mass of Cu in 100 g of the alloy and then adjust it for the given amount of the alloy (14.0 g).

By using the formula (mass of Cu in given alloy = percentage of Cu in alloy * total mass of alloy) we can calculate the mass of Cu in the given alloy, and then by multiplying it with the ratio of given alloy to total alloy we can calculate the mass of Cu in the given alloy.

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Answer:

264g

Explanation:

C + O2 -> CO2

_g + _g -> 396g

396÷3=132

C (132g) + O2 (264g) -> CO2 (396g)

The third law of thermodynamics describes the entropy of a: solid.

The third law of thermodynamics states that the entropy of a pure crystalline substance approaches zero as the temperature approaches absolute zero (0 Kelvin or -273.15 degrees Celsius). This law implies that at absolute zero, a perfectly ordered and pure crystalline solid will have zero entropy.

The third law of thermodynamics is not specific to liquids or gases but applies to solids. In a solid, the molecules are highly ordered and have fixed positions in a regular lattice structure. As the temperature decreases towards absolute zero, the thermal motion of the molecules reduces, and the system becomes more ordered, resulting in a decrease in entropy.

In contrast, liquids and gases have higher entropy compared to solids at absolute zero because their molecules have more freedom of movement and are not as tightly arranged. Therefore, the third law of thermodynamics specifically addresses the entropy of solids and does not apply to liquids or gases.

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To separate the mixture of water, salt, iron filings, sand, and Styrofoam, you can follow the following steps:

By following these steps, you can separate the different components of the mixture effectively.

Answer:

17

Explanation:

br is liquid

cl is gas

and iodide is solid

Answer:

All properties of matter are either physical or chemical properties and physical properties are either intensive or extensive. ... Physical properties can be measured without changing a substance's chemical identity. Chemical properties can be measured only by changing a substance's chemical identity.

Explanation:

To calculate the amount of KCl in the given solution, we utilize the formula relating moles, concentration, and volume. Consequently, we determine that the solution contains approximately 1.34 moles of KCl per liter

The number of moles of KCl in the given solution can be calculated using the formula: moles = mass / molar mass. Given that the mass of KCl is 15.0 g and the molar mass of KCl is 74.45 g/mol, we can calculate the moles as follows: moles = 15.0 g / 74.45 g/mol, resulting in approximately 0.2012 moles of KCl. Therefore, the solution contains approximately 0.2012 moles of KCl.

To determine the molarity of a solution, we need to consider the number of moles of solute in relation to the volume of the solution. In this case, since the volume is given as 150.0 mL, we convert it to liters by dividing by 1000: 150.0 mL / 1000 mL/L = 0.1500 liters.

Using the formula Molarity (M) = moles of solute / volume of solution (in liters), we can calculate the molarity of the solution: Molarity (M) = 0.2012 moles / 0.1500 L = approximately 1.3413 M (rounded to four decimal places). Therefore, the molarity of the solution is approximately 1.3413 M.

Molarity = 0.2012 mol / 0.1500 L

Molarity = 1.34 M (rounded to two decimal places)

Hence, the molarity of the KCl solution is approximately 1.34 M. This means that there are 1.34 moles of KCl present per liter of solution.

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The water absorbs approximately 0.0142 kJ of heat when heated from 32.6°C to 78.9°C.

To determine the amount of heat absorbed by the water, we can use the formula:

q = m × c × ΔT

where q is the heat absorbed, m is the mass of the water, c is the specific heat capacity of water, and ΔT is the change in temperature.

The specific heat capacity of water is 4.184 J/(g·°C), or 4.184 × 10⁻³ kJ/(g·°C).

Converting the given mass from grams to kilograms, we have:

m = 75.0 g = 0.075 kg

The change in temperature is:

ΔT = 78.9°C - 32.6°C = 46.3°C

Substituting these values into the formula, we get:

q = (0.075 kg) × (4.184 × 10 kJ/(g·°C)) × (46.3°C)

q = 0.0142 kJ

Therefore, the water absorbs approximately 0.0142 kJ of heat.

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EXPLANATION:

Ethanol is commonly known as ethyl alcohol, pure alcohol, grain alcohol, and most importantly it is known alcohol present in alcoholic beverages.

The chemical formula of ethanol is written below as

Ethanol is very soluble in water and also, it has many functions due to the presence of hydroxyl as the functional group.

The next thing is to draw the structure of ethanol

Ethanol act as a fuel because the ethanol molecule contains oxygen, it allows the engine to more completely combust the fuel.

Answer:  reverse osmosis.

Explanation:

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Answer:

d

Explanation:

A: mass never increases or decreases. It is a value that is the same everywhere in the universe. A is not correct.

B: it can be but that is not the only unit that can be used

C: A spring scale measures force not mass.

D: The answer to this question is D if the word at the end is balance.

Nuclear fusion in stars, such as our Sun, produces energy through the fusion of light atomic nuclei, mainly hydrogen, into heavier nuclei like helium. This fusion process releases a tremendous amount of energy.

Within the core of a star, where temperatures and pressures are extremely high, nuclear fusion takes place. The collisions between hydrogen atoms at such high temperatures provide the necessary energy to overcome electrostatic repulsion, enabling the fusion process.

In the proton-proton chain, the most common fusion process in stars, hydrogen nuclei combine to form helium nuclei through several reactions. The conversion of a small fraction of mass into energy, as described by Einstein's mass-energy equivalence, results in the release of energy in the form of gamma rays.

These high-energy photons interact with matter, gradually transforming into light and heat. This energy release sustains the star's stability by countering gravitational collapse and powers its luminosity for billions of years.

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