PLEASE HELP I DO NOT UNDERSTAND ANY OF THIS

Mass (g)
crucible + lid 31.064
crucible + lid + Mg ribbon 31.634
crucible + lid + final solids 31.970

Calculations:

1. Calculate the mass of magnesium that was added to the crucible.
2. Calculate the number of moles of magnesium that were added to the crucible.
3. Calculate the mass of oxygen that was added to the crucible using the mass of the solid MgO product.
4. Calculate the number of moles of O atoms that were added to the crucible.
5. Using your answers to questions 2 and 4, write the empirical formula for MgxOy. (i.e. determine the values of x and y in the empirical formula). Reduce the ratio of x:y to whole numbers.
6. Based on the charge of the magnesium and oxygen ions, did you measure the expected ratio of magnesium to oxygen ions in magnesium oxide?

Answer:

We need more? What else is in the question? This is unanswerable.

Explanation:

Answer:

The answer is D. The Sun is the closest star to Earth and so it seems brighter than distant stars that have much greater absolute brightness.

Explanation: Stars like red super giants like beetleguise are way brighter and bigger than the sun, but the sun is closest to the earth. It is only in its main sequence stage but seems bright because of its short distance from the sun( 93 million miles).

There are billions of stars in the known universe, none of them seem to be as bright as the Sun beacuse the Sun is the closest star to Earth.

Stars are those astronomical bodies which are formed by the mixture of gases mainly of hydrogens and heliums, which are held by its own gravity.

In the universe or in the sky many stars are present which are luminous in appearance but among all of them only sun looks like more brighter, because the distance between the earth and the sun is not that much high as in between the other stars. That's why sun looks more brighter rather than other stars.

So, the Sun is the closest star to Earth and so it seems brighter than distant stars that have much greater absolute brightness.

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The half-reaction is; H₂ → 2H⁺ + 2e⁻, the oxidizing agent is chlorine , and the reducing agent is hydrogen. The oxidation half-reaction is where a species loses electrons, the reduction half-reaction is where a species gains electrons, the oxidizing agent is the species that causes another species to be oxidized by accepting electrons itself, and the reducing agent is the species that causes another species to be reduced by donating electrons itself.

The oxidation half-reaction is the half-reaction where a species loses electrons. In this reaction, hydrogen (H₂) is oxidized to form hydrogen ions (H⁺). The half-reaction can be written as;

H₂ → 2H⁺ + 2e⁻

The reduction half-reaction is the half-reaction where a species gains electrons. In this reaction, chlorine (Cl₂) is reduced to form chloride ions (Cl⁻). The half-reaction can be written as follows;

Cl₂ + 2e⁻ → 2Cl⁻

The oxidizing agent is the species that causes another species to be oxidized by accepting electrons itself. In this reaction, chlorine (Cl₂) is the oxidizing agent because it accepts electrons from hydrogen (H₂), causing it to be oxidized.

The reducing agent is the species that causes another species to be reduced by donating electrons itself. In this reaction, hydrogen (H₂) is the reducing agent because it donates electrons to chlorine (Cl₂), causing it to be reduced.

Therefore, chlorine is the oxidizing agent, and hydrogen is the reducing agent.

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The gas expands in volume as the temperature rises. The kinetic energy of the gas's molecules increases with temperature. They make greater direct contact with the container's surface. If the container has the ability to expand, the volume rises until the pressure reaches its starting point.

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 holds onto the kinetic energy it acquired during its acceleration until its speed changes.

According to Charles' Law, the volume and Kelvin temperature are directly connected when the pressure on a sample of a dry gas is held constant.

Thus,The average speed and kinetic energy of the gas molecules increase as the temperature rises.

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Answer:

How do amoeba respire.

how do plants respire.

Answer:

1. CH₂Br > CH₂OH > CH₂NH₂ > CH₃

2. -F > -CHO > - CH₂OH > CH₃

Explanation:

The arrangement of the above atom is due to their atomicity and electronegativity of the given compounds.

From (1) we will realize that Bromine (Br) possesses the greatest priority because its atomic number is the highest. This is followed by oxygen (O) in CH₂OH since atomic no 8 is higher than that of Nitrogen N(7). Lastly, CH₃ has the only hydrogen attached to it with the atomic no of (1)

In the second part of the question>

The electronegativity of an element increases across the period and down the group. Fluorine is highly electronegative and contains the highest atomic number of oxygen in -CHO. The oxygen (O) in -CHO has a double bond which gives an edge over the (O) in CH₂OH. Lastly, CH₃ contains a substituted hydrogen atom

The volume of gas when the pressure is 45 psi is 2,833.33mL.

The volume of a substance can be calculated using Boyle's law equation as follows:

P₁V₁ = P₂V₂

Where;

According to this question, a tank of carbondioxide has a pressure of 850 psi and a volume of 150 mL. The volume can be calculated as follows:

850 × 150 = 45 × V

V = 127,500 ÷ 45

V = 2,833.33mL

Therefore, 2,833.33mL is the volume of the gas.

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For this section:

(d) To determine which acid would be completely dissociated when dissolved in water, consider the strength of the acid and its ability to ionize completely. Strong acids are those that ionize completely in water, while weak acids only partially dissociate.

Among the given options:

(H O)₂SO is sulfuric acid (H₂SO₄), which is a strong acid and completely dissociates in water.

(H O)IO₃ is iodic acid (HIO₃), which is also a strong acid and completely dissociates in water.

(H O)₂SO₂ is not a known acid and cannot be evaluated for dissociation.

HCO₂H is formic acid (HCOOH), which is a weak acid and only partially dissociates in water.

Therefore, the acids that would be completely dissociated when dissolved in water are (H O)₂SO and (H O)IO₃.

(e) To estimate the pH of the given solutions formed by titration, compare the moles of the acid and base used in the reaction.

(i) For the titration of 25.0 mL of 0.10 M aqueous NaOH with 25.0 mL of 0.10 M aqueous HCl, the reaction between a strong acid (HCl) and a strong base (NaOH) forms a neutral salt (NaCl) and water. The resulting solution would have a pH of 7, indicating neutrality.

(ii) For the titration of 25.0 mL of 0.10 M aqueous NaOH with 25.0 mL of 0.10 M aqueous acetic acid, consider the ionization of acetic acid and the formation of its conjugate base. The pKa of acetic acid is given as 4.76.

Since the volumes and concentrations of the acid and base are equal, we have a 1:1 mole ratio between them. This means that half of the acetic acid will be neutralized, and the remaining half will be in the form of the conjugate base (acetate ion, CH₃COO-). The resulting solution will be a buffer solution with a pH close to the pKa of acetic acid, which is 4.76.

(f) To predict the products formed from mixing the given reagents, we need to consider the reactions and the possible chemical reactions that occur.

(i) 3I₂ + PBr₃: This reaction involves the combination of iodine (I₂) with phosphorus tribromide (PBr₃). The balanced equation is:

3I₂ + 2PBr₃ → 6IBr + P₂

(ii) 4LiH + GaCl₃: This reaction involves the combination of lithium hydride (LiH) with gallium trichloride (GaCl₃). The balanced equation is:

4LiH + GaCl₃ → 4LiCl + GaH₃

(iii) NH₃ + BCl₃: This reaction involves the combination of ammonia (NH₃) with boron trichloride (BCl₃). The balanced equation is:

NH₃ + BCl₃ → NH₃BCl₃

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Answer:

Replacement is your answer

A sulfonic acid functional group is added to the molecule during the process of sulfonation. Aromatic sulfonation occurs when the sulfonic acid group is added to aromatic compounds.

Fluorine raises the electron density at the ring by mesomeric action and is an ortho and para directing group, leading to the formation of p-fluorobenzene-sulfonic acid and o-fluorobenzene-sulfonic acid during the sulfonation of fluorobenzene. Since substitution between two groups seldom happens, both -OH and -Br are ortho and para directed, resulting in the formation of the two products 2-Bromo-4-hydroxybenzenesulfonic acid and 4-Bromo-2-hydroxybenzenesulfonic acid. As -Cl is an ortho and para directing group, 2,4-Dichlorobenzene-sulfonic acid results from the sulfonation of m-dichlorobenzene. 2,4-Dibromophenol is sulfonated to produce 3,5-Dibromo-2-hydroxybenzenesulfonic acid as the end product.

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According to the claim, Balloon A, which has more blue and less orange, exhibits accurate effusion at a relative effusion rate of 1.303. (orange is 1.303 times more effused than blue).Relative rate of effusion for the orange to blue spheres = 1.531.

The process of effusion is when a gas escapes from a container through a hole that is significantly smaller in diameter than the molecules' mean free path.

Gas molecules flow through a small opening in one container and into another by effusion. Graham's law allows rates of effusion to be compared at the same temperature. Diffusion is the random molecular motion-based movement of gas molecules through one or more other types of gas.

Rate of effusion of Orange / Rate of effusion of blue

= [Mblue / Morange]^1/2

Vrms = sqrt [(3RT/M)]

Vorange / Vblue = [ Mblue / Morange]^1/2

Rate of effusion of Orange / Rate of effusion of blue

= 565/ 369

= 1.531

Thus,  Balloon A, which has more blue and less orange, exhibits accurate effusion at a relative effusion rate of 1.303.

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The stage that this most accurately describes while using the PCR is the initiation of DNA synthesis, also known as the denaturation stage.

In the denaturation stage of Polymerase Chain Reaction (PCR), the double-stranded DNA template is heated to a high temperature to separate the two complementary strands and create single-stranded DNA. The denaturation stage is the first step in the PCR cycle.

In this stage, the heat-stable DNA polymerase denatures the DNA and the primers anneal to the complementary single-stranded template. This marks the beginning of the extension stage, where the DNA polymerase synthesizes new complementary strands along the template DNA.

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moles ratio of NH3 to H2O is 4:6

if 4=6

1. ?

1 * 6 /4 = 1.5

1.5 moles of water

Answer:B

Explanation:

Answer: I got -4542.9kg/mol

Explanation:

Using the enthalpy relation, the enthalpy of formation of propane gas in the given equation is 4542.9 kJ/mol

Using the enthalpy value of \( CO_{2} \) and\( H_{2}0\) given :

Enthalpy of formation = product - Reactant

2219.2 = -2323.70 - (propane + 0)

2219.2 = - 2323.70 - propane

Propane = - 2323.70 - 2219.2

\( C_{3}H_{8} = - 4542.9 \)

Therefore, the entalphy of formation of propane gas is - 4542.9 kJ/mol.

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7.54 *\(10^8\) meters is  75.4 nanometers.

To convert 7.54 *  \(10^8\) meters to nanometers, you can multiply the value by \(10^9\)

as,  \(10^9\)nanometers = 1  meter.

7.54 * \(10^8\) m * \(10^9\) =  7.54 x \(10^1\) nm

Therefore, 7.54 *\(10^8\) meters is equal to 75.4 nanometers.

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To convert 7.54 x 10^-8 meters to nanometers, you multiply 7.54 x 10^-8 by 1 x 10^9 to get 75.4 nanometers.

To convert meters to nanometers, you need to know that 1 meter is equivalent to 1 x 109 nanometers. Therefore, if you were to convert 7.54 x 10-8 m to nanometers, you would multiply 7.54 x 10-8 by 1 x 109.

Here's how you'd do it: 7.54 x 10-8 m * 1 x 109 nm/m = 75.4 nm. So, 7.54 x 10-8 meters is equivalent to 75.4 nanometers.

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Answer:

the second option

Explanation:

look at the distance where the meet up at the house and the go to school

Answer:

BaCl2(aq) + Na2SO4(aq) → BaSO4(s)↓ + 2NaCl(aq) is the equation for the reaction.

Explanation:

Not sure if this is correct

The liquid that is expected to have the weakest intermolecular interaction is the liquid that has the lowest boiling point and surface tension.

The term boiling point refers to the temperature at which the atmospheric pressure and the pressure of the liquid becomes equal. The greater the intermolecular forces of attraction between molecules the higher the boiling point of the solid. Also a high surface tension indicates a strong  intermolecular forces of attraction between molecules.

The liquid that is expected to have the weakest intermolecular interaction is the liquid that has the lowest boiling point and surface tension.

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Answer:

Explanation:

The amount of heat that must be added to heat 50 grams of water from 42.0° C to 100.0° C can be calculated using the specific heat capacity formula: Q = m*C*ΔT, where Q is the heat required, m is the mass of the water, C is the specific heat capacity of water, and ΔT is the temperature change.

Using the values given, we have:

Q = 50 g * 1 cal/g °C * (100.0°C - 42.0°C)

Q = 50 g * 1 cal/g °C * 58.0°C

Q = 2,900 calories

Therefore, the amount of heat that must be added to heat 50 grams of water from 42.0° C to 100.0° C is 2,900 calories. The answer is option (C).

Answer:

the potential across this cell membrane is -0.082 volts, with the inside of the cell being negative relative to the outside.

Explanation:

The Nernst equation can be used to calculate the equilibrium potential (in volts) for a given ion across a membrane, given the concentration of the ion inside and outside the cell:

E = (RT/zF) ln([ion]out/[ion]in)

where E is the equilibrium potential, R is the gas constant (8.314 J/mol*K), T is the temperature in Kelvin (37+273=310 K), z is the charge on the ion (+1 for K+), F is the Faraday constant (96,485 C/mol), [ion]out is the extracellular concentration of the ion (4.0 mM for K+), and [ion]in is the intracellular concentration of the ion (150 mM for K+).

Plugging in these values:

E = (8.314310/196485) ln(4.0/150)

E = -0.082 V

Therefore, the potential across this cell membrane is -0.082 volts, with the inside of the cell being negative relative to the outside.

Answer: 3.46 grams of water is produced.

Explanation:

The chemical formula for aluminum hydroxide is Al(OH)3. When it decomposes, it forms aluminum oxide (Al2O3) and water (H2O).

The balanced chemical equation for this reaction is:

2 Al(OH)3 → Al2O3 + 3 H2O

molar mass of Al(OH)3 = 78.0 g/mol

moles of Al(OH)3 = mass / molar mass = 10.0 g / 78.0 g/mol = 0.1282 mol

mole ratio from the balanced equation to calculate the number of moles of water produced:

moles of H2O = (3/2) * moles of Al(OH)3

moles of H2O = (3/2) * 0.1282 mol = 0.1923 mol

convert the moles of water to grams:

molar mass of H2O = 18.0 g/mol

mass of H2O = moles of H2O * molar mass = 0.1923 mol * 18.0 g/mol = 3.46 g

Answer:

ok, here is your answer

Explanation:

AI-generated answer

To find the mass of oxygen that reacted, we need to use the Law of Conservation of Mass, which states that in a chemical reaction, the mass of the reactants equals the mass of the products.

First, we need to find the number of moles of hydrogen that reacted:

Molar mass of hydrogen (H₂) = 2.016 g/mol

Number of moles of H₂ = mass/molar mass = 46.2 g/2.016 g/mol = 22.92 mol

Next, we need to use the balanced chemical equation to find the number of moles of water produced:

hydrogen + oxygen → water

2H₂ + O₂ → 2H₂O

From the equation, we can see that for every 2 moles of H₂, 1 mole of O₂ is required to produce 2 moles of H₂O. Therefore, the number of moles of O₂ required to produce 22.92 moles of H₂O is:

Number of moles of O₂ = 1/2 x 22.92 mol = 11.46 mol

Finally, we can find the mass of oxygen that reacted by using its molar mass:

Molar mass of oxygen (O₂) = 32.00 g/mol

Mass of oxygen = number of moles x molar mass = 11.46 mol x 32.00 g/mol = 366.72 g

Therefore, the mass of oxygen that reacted is 366.72 g.

Answer:

0.0295M

Explanation:

As you can see, in the mixture you have KSCN and other compounds. The KSCN in solution is dissolved in K⁺ ions and SCN⁻ ions. That means initial concentration of SCN⁻ ions is the same of KSCN, 0.0800M.

You are adding 35.0mL of this solution and the total volume of the mixture is 20.0mL + 35.0mL + 40.0mL = 95.0mL.

That means you are diluting your solution 95.0mL / 35.0mL = 2.714 times.

And the concentration of SCN⁻ is:

0.0800M / 2.714 =

The concentration of the specie is obtained as  0.79 M.

We know that a buffer is a solution that is resistant to changes in acidity and alkalinity. Now, we know that we have the following information;

pH = 10.00

Concentration of base = 0.18 M

Kb = 4.4 x 10 -4

Hence;

pOH = 14 - 10.00 = 4

pKb = -log( 4.4 x 10 -4)  3.36

Using the formula;

pOH = pKb + log [A-/AH]

4 = 3.36 + log[A-/0.18]

4 - 3.36 = log[A-/0.18]

Antilog(4 - 3.36) = [A-/0.18]

A- = Antilog(4 - 3.36) * 0.18

A- = 0.79 M

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Answer:

The brain and body are connected through neural pathways made up of neurotransmitters, hormones and chemicals. These pathways transmit signals between the body and the brain to control our everyday functions, from breathing, digestion and pain sensations to movement, thinking and feeling.

The mass (in grams) of chlorine gas is needed to react with 251 grams of iron is 479 grams. Option C.

To determine the mass of chlorine gas needed to react with 251 grams of iron, we need to use the stoichiometry of the balanced chemical equation:

2Fe + 3Cl2 → 2FeCl3

From the balanced equation, we can see that 2 moles of iron (Fe) react with 3 moles of chlorine gas (Cl2) to produce 2 moles of iron(III) chloride (FeCl3).

To calculate the mass of chlorine gas, we can follow these steps:

Step 1: Convert the given mass of iron (Fe) to moles.

Using the molar mass of iron (Fe), which is approximately 55.85 g/mol, we can calculate the number of moles of iron:

moles of Fe = mass of Fe / molar mass of Fe

moles of Fe = 251 g / 55.85 g/mol

moles of Fe ≈ 4.5 mol (rounded to one decimal place)

Step 2: Use the mole ratio from the balanced equation to find the moles of chlorine gas (Cl2) needed.

From the balanced equation, we know that 2 moles of Fe react with 3 moles of Cl2. Therefore, the moles of Cl2 can be calculated as:

moles of Cl2 = (moles of Fe / 2) * 3

moles of Cl2 = (4.5 mol / 2) * 3

moles of Cl2 ≈ 6.75 mol (rounded to two decimal places)

Step 3: Convert the moles of chlorine gas to grams.

Using the molar mass of chlorine gas (Cl2), which is approximately 70.90 g/mol, we can calculate the mass of chlorine gas:

mass of Cl2 = moles of Cl2 * molar mass of Cl2

mass of Cl2 = 6.75 mol * 70.90 g/mol

mass of Cl2 ≈ 479 grams (rounded to the nearest whole number) Option C is correct.

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The density of manganese is 7.33g/cm³

Radius of manganese atom:

V = 4/3 πr³

r = ∛3V/4π

r = ∛ (3(9.21Α * 10⁻²⁴ cm³) / 4π

r = 1.30Α  * 10⁻⁸ cm.

Edge length of the unit cell:

Since manganese has FCC structure

a = 2√2r

= 2√2(1.30Α  * 10⁻⁸)

= 3.68Α * 10⁻⁸ cm.

Volume of manganese atoms in one unit cell:

V = a³

= (3.68Α * 10⁻⁸)³

= 4.898Α * 10⁻²³

Mass of manganese atoms in one unit cell:

Since manganese has FCC structure, there are 4 atoms in a unit cell. The atomic weight of manganese is 54.94 g/mol.

m = 54.94 * 4/ 6.033* 10⁻²³

= 3.65 * 10⁻²²

Density of manganese:

p = mass/Volume

= 3.65 * 10⁻²² / 4.898Α * 10⁻²³

= 7.33g/cm³

Hence, the density of manganese is 7.33g/cm³

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The appearance and physical states of the material given is described below please look at it.

Baking soda: It is a white solid.

Salt: it is white in color having a solid physical state.

Sugar: It is white in color having crystals or solid in physical state.

Flour: It is creamish white in color having solid particles.

Vinegar: It is transparent in color.

Cooking oil: It is a yellowish emulsion.

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