If a sample of magnesium with a mass of 35.0 grams reacts with 35.0 grams of oxygen how much magnesium oxide will be produced?​

The total pressure in the flask after 1.00 hour will be 0.85 atm.

The given process is a second-order reaction, and its rate law is given by:

rate = k[CH₃CHO]²

where k is the rate constant and [CH₃CHO] is the concentration of acetaldehyde.

The half-life of the reaction is given as 410 seconds, which can be used to determine the rate constant as follows:

t1/2 = 1 ÷ k[CH₃CHO]²

410 s = 1 ÷ k[CH₃CHO]²

k = 1 ÷ (410 s [CH₃CHO]²)

Assuming that the reaction proceeds to completion, i.e., all the acetaldehyde is converted to methane and carbon monoxide, we can use the ideal gas law to determine the total pressure:

PV = nRT

where P is the total pressure, V is the volume of the flask (500 mL = 0.5 L), n is the number of moles of gas, R is the gas constant (0.08206 L atm/mol K), and T is the temperature (518 °C = 791 K).

Let [CH₃CHO]₀ be the initial concentration of acetaldehyde, then:

[CH₃CHO]₀ = P₀ ÷ RT

[CH₃CHO] = [CH₃CHO]₀ exp(-kt)

n(CH₃CHO) = [CH₃CHO]₀ V

n(CH4) = n(CO) = n(CH₃CHO)

Therefore, the total pressure at equilibrium is given by:

P = n(RT ÷ V) = [CH₃CHO]₀ (RT ÷ V) exp(-kt) + 2 [CH₃CHO]₀ (RT ÷ V)

P = P₀ exp(-kt) + 2P0

where P0 is the initial pressure of acetaldehyde (364 mmHg = 0.48 atm)

k = 1 ÷ (410 s [CH3CHO]³) = 0.000039 M⁻¹ s⁻¹

[CH₃CHO]₀ = P₀ ÷ RT = 0.48 atm ÷ (0.08206 L atm/mol K × 791 K) = 0.00706 M

P = P0 exp(-kt) + 2P0

P = 0.48 atm exp (-0.000039 M⁻¹ s⁻¹ × 3600 s) + 2 × 0.48 atm

P = 0.85 atm

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Answer:

Trigonal planar

Explanation:

If a hypothetical molecule XY3 has three electron domains as shown and no lone pairs, the molecule will be trigonal planar in shape.

From the valence shell electron pair repulsion theory, the shape of molecules is dependent on the number of electron domains in a molecule and weather those electron pairs are lone pairs or bond pairs.

Since lone pairs cause more repulsion and take up more space around the central atom than bond pairs, bond pairs cause the bond angle and molecular geometry to deviate from that predicted on the basis of the valence shell electron pair repulsion theory.

Finally, remember that in a molecule, electron pairs are placed as far apart in space as possible to minimize repulsion.

The pressure exerted by a column of mercury that is about 760 mm high corresponds to approximately 0.987 atm.

To calculate the pressure exerted by a column of mercury, we can use the formula:

Pressure = density * gravity * height

Given:

Density of mercury = 13.6 g/cm³

Height of the mercury column = 760 mm = 76 cm

Acceleration due to gravity = 9.8 m/s²

First, we need to convert the height of the mercury column from centimeters to meters:

Height = 76 cm * (1 m / 100 cm) = 0.76 m

Now, we can calculate the pressure:

Pressure = 13.6 g/cm³ * 9.8 m/s² * 0.76 m

To ensure consistent units, we need to convert the density from grams per cubic centimeter (g/cm³) to kilograms per cubic meter (kg/m³):

Density = 13.6 g/cm³ * (1 kg / 1000 g) * (1 cm³ / (1e-6 m³))

Density = 13600 kg/m³

Plugging in the values into the pressure formula:

Pressure = 13600 kg/m³ * 9.8 m/s² * 0.76 m

Pressure = 99992.8 Pa

We can express the pressure in terms of atmospheric pressure:

1 atm = 101325 Pa (approximately)

To compare the pressure with atmospheric pressure, we can convert 99992.8 Pa to atm:

Pressure in atm = 99992.8 Pa / 101325 Pa/atm

Pressure in atm ≈ 0.987 atm

The pressure exerted by a column of mercury that is about 760 mm high corresponds to approximately 0.987 atm. Since atmospheric pressure near sea level is approximately 1 atm, this calculation supports the claim that atmospheric pressure near sea level is equivalent to the pressure exerted by a column of mercury about 760 mm high.

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The temperature in the new scale is 71.4 ºE.

Now we know that a thermometer has two fixed points, the upper fixed points and the lower fixed point.

Our concern is to obtain the temperature on the ºE scale tat would correspond to22.3 ºC on the Celsius scale thus we can write;

23 - (–114.1)/78.2 -  (–114.1) = X - 0/100 - 0

We have designated the unknown temperature as X

137.1/192.1 = X/100

100 * 137.1 = 192.1 X

X = 100 * 137.1/192.1

X = 71.4 ºE

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If tadpoles are hatched in stagnant water then they have got a lower survival rate than those hatched in churned & aerated water because the sitting water is higher. Testable via experimenting with tadpoles in unique settings.

Eggs generally hatch in 2-3 weeks, however, this time varies based totally on water temperature. One egg is seen whereas the other embryos are very advanced and are probably near hatching. four. The larval degree tadpole level.

A filter-out, however, can lessen the number of water adjustments in order to be needed. The clear-out must not be so robust that it creates too much current— tadpoles are terrible swimmers. make certain the tadpoles may not be up into the clear out and that they don't should swim constantly.

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Answer:

The volume of Component 1 is 36 cubic inches.

Explanation:

To calculate the volume of a composite solid, we need to determine the individual volumes of the different components and then add them together.

In this case, the composite solid consists of multiple components with the following dimensions:

Component 1:

Length: 4 inches

Width: 3 inches

Height: 3 inches

To find the volume of Component 1, we multiply the length, width, and height together:

Volume of Component 1 = Length x Width x Height = 4 in x 3 in x 3 in = 36 cubic inches

Therefore, the volume of Component 1 is 36 cubic inches.

Please provide the dimensions of the remaining components of the composite solid, and I will calculate the total volume by summing up the individual volumes.

Answer:

The cell potential for the given galvanic cell is 0.188 V.

Explanation:

To calculate the cell potential, we can use the Nernst equation:

Ecell = E°cell - (RT/nF)ln(Q)

where E°cell is the standard cell potential, R is the gas constant (8.314 J/mol·K), T is the temperature in Kelvin (25°C = 298 K), n is the number of moles of electrons transferred (in this case, n = 2), F is the Faraday constant (96,485 C/mol), and Q is the reaction quotient.

First, we need to write the half-reactions and their standard reduction potentials:

Sn4+(aq) + 2e- → Sn2+(aq) E°red = 0.15 V

Fe3+(aq) + e- → Fe2+(aq) E°red = 0.77 V

The overall reaction is the sum of the half-reactions:

Sn2+(aq) + 2Fe3+(aq) → Sn4+(aq) + 2Fe2+(aq)

The reaction quotient Q can be expressed as:

Q = [Sn4+][Fe2+]^2 / [Sn2+][Fe3+]^2

Substituting the given concentrations, we get:

Q = (0.00655)(0.01139)^2 / (0.0624)(0.0437)^2 = 0.209

Now we can calculate the cell potential:

Ecell = 0.15 V + 0.0592 V log([Fe2+]^2/[Fe3+]) + 0.0592 V log([Sn4+]/[Sn2+])

= 0.15 V + 0.0592 V log(0.01139^2/0.0437^2) + 0.0592 V log(0.00655/0.0624)

= 0.188 V

Therefore, the cell potential for the given galvanic cell is 0.188 V.

The cell potential for the given galvanic cell in which the given reaction occurs at 25 °C is 0.188 V.

To find the cell potential, we take the Nernst equation:

Ecell = E°cell - (RT/nF)ln(Q)

In which R is the gas constant (8.314 J/mol·K) and E° cell is the standard cell potential.

T temperature in Kelvin (25°C = 298 K), and n is the number of moles of electrons transferred (n = 2), Q is the reaction quotient and F is the Faraday constant (96,485 C/mol).

Firstly, write the half-reactions and then their standard reduction potentials:

Sn⁴⁺(aq) + 2e⁻  → Sn²⁺(aq) E°red = 0.15 V

Fe³⁺(aq) + e⁻ → Fe²⁺(aq) E°red = 0.77 V

The overall reaction is the sum of the half-reactions:

Sn²⁺(aq) + 2Fe³⁺(aq) → Sn⁴⁺(aq) + 2Fe²⁺(aq)

The Q reaction quotient can be written as:

Q = [Sn⁴⁺][Fe²⁺]² ÷ [Sn²⁺][Fe²⁺]²

Substituting the given concentrations, we observe:

Q = (0.00655)(0.01139)² ÷ (0.0624)(0.0437)² = 0.209

Next, we can find the cell potential:

Ecell = 0.15 V + 0.0592 V log([Fe²⁺]²/[Fe³⁺]) + 0.0592 V log([Sn⁴⁺]/[Sn²⁺])

= 0.15 V + 0.0592 V log(0.01139²÷0.0437²) + 0.0592 V log(0.00655÷0.0624)

= 0.188 V

Thus, the cell potential for the given galvanic cell is 0.188 V.

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Explanation:

Sublimation describes a solid turning directly into a gas. Melting, on the other hand, occurs when a solid turns into a liquid. Water can, under the right circumstances, sublimate, though it usually melts at temperatures above 0 degrees Celsius or 32 degrees Fahrenheit. Carbon dioxide (CO2), however, is very different. The conditions that determine whether CO2 melts or sublimates are both temperature and atmospheric pressure.

Answer:

Mendeleev had left the noble gases out of his periodic table.

Explanation:

Mendeleev's periodic table is pictured in the image attached to the question.

Mendeleev's table obviously lacked the noble gases. The reason for this grave omission is simple; the noble gases were not known as at the time when he formulated his periodic table. There weren't any known elements  whose properties were similar to the  properties of the noble gases. This would have lead him to suspect their existence.

Answer:

2:2:1

Explanation:

The reaction expression is given as:

              HXO   →    HX   +  O₂

We are to balanced this unbalanced reaction expression.

  To solve this put, coefficient a, b and c before every specie:

     aHXO   →    bHX   +  cO₂

Now use a mathematical approach to solve this;

  Conserving H:   a  = b

                       X:   a  = b

                       O:    a  = 2c

    let a  = 1, b  = 1 and  c = \(\frac{1}{2}\)  

  Multiply through by 2;

   a  = 2, b = 2 and c  = 1

 So;

          2HXO   →   2HX   +  O₂

Balanced ratio;       2:2:1

The number of moles of carbon dioxide produced will be 8.6 moles.

First, let's look at the balanced equation of the reaction. The complete combustion of ethanol gives carbon dioxide and water as follows:

\(C_2H_5OH + 3O_2 --- > 2CO_2 + 3H_2O\)

We can see from the equation that the burning of 1 mole of ethanol produces 2 moles of carbon dioxide. In other words, the mole ratio is 1:2.

Thus, with 4.3 moles of ethanol, the amount, in moles, of carbon dioxide that will be produced will be:

                            4.3 x 2 = 8.6 moles

In other words, 8.6 moles of carbon dioxide will be produced from the complete combustion of 4.3 moles of ethanol.

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The number of the grains of rice that we have from the question here is  16214 grains

In this case, we know that we have to rely on the information that we have in the question so as to be able to obtain the mass of the rice that we need in this case and that is what we are going to set out to do in this question.

We know that;

Mass of the Rice = 786 grams - 332 grams

= 454 g

If 1000 grains of rice have a mass of 28 g

x grains of rice have a mass of 454 g

x = 1000 * 454/28

x = 16214 grains

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Answer:2m

Explanation:

4/2=2

The wavelength will be "2 m".

Given values are:

Frequency,

Speed,

As we know,

→ \(Frequency(f) = \frac{Speed (v)}{Wavelength (\lambda)}\)

or,

→                     \(\lambda = \frac{v}{f}\)

By substituting the values, we get

→                        \(=\frac{4}{2}\)

→                        \(= 2 \ m\)

Thus the above response is correct.

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Answer:

batteries

Explanation:

bc they're powered by energy

Answer:

0.74  g O

3

​

=

48

0.74

​

=0.0154 mol O

3

​

0.67 g NO=

30

0.67

​

=0.0223 mol NO

O

3

​

 is the limiting reagent and NO is in excess =0.0223−0.0154=0.007 mol

Thus, O

3

​

 taken =NO

2

​

 formed =0.0154 mol NO

2

​

                             =0.0154×46 g NO

2

​

Explanation:

Answer:

nonmtals:

Uses of nonmetals in our daily life: Oxygen which is 21% by volume helps in the respiration process. It is also used for manufacturing of steel and provides high temperature in metal fabrication process. ...

Nonmetals used in fertilizers: Fertilizers contain nitrogen. It helps in plant growth. ...

Nonmetals used in crackers

Non-Malleable and Ductile: Non-metals are very brittle, and cannot be rolled into wires or pounded into sheets. Conduction: They are poor conductors of heat and electricity. Seven non-metals exist under standard conditions as diatomic molecules: H2(g)

Explanation:

Answer:

8.96g\ cm3

Explanation:

D = ( 89.6g \ 10cm3)

( 89.6\ 10) ( g\ cm3) = 8.96g\cm3

intermolecular forces are Ionic bond, Covalent bond, Hydrogen bond, Dipole-dipole interaction, Dispersion forces (Van der Waals forces).

Intermolecular forces are the forces that exist between molecules and determine many of their physical properties. These forces can be categorized into five main types: ionic bonds, covalent bonds, hydrogen bonds, dipole-dipole interactions, and dispersion forces (Van der Waals forces). Ionic bonds occur between ions with opposite charges and are the strongest intermolecular forces. Covalent bonds are formed by sharing electrons between atoms and are also strong. Hydrogen bonds are weaker than ionic and covalent bonds, but still play a significant role in molecular behavior. Dipole-dipole interactions occur between molecules with permanent electric dipoles. Finally, dispersion forces, also known as Van der Waals forces, are the weakest intermolecular forces and arise from the fluctuating electric fields generated by electrons. Understanding the relative strengths of these intermolecular forces is crucial for predicting and understanding the behavior of molecules.

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Answer:

The lock-and-key model:

c. Enzyme active site has a rigid structure complementary

The induced-fit model:

a. Enzyme conformation changes when it binds the substrate so the active site fits the substrate.

Common to both The lock-and-key model and The induced-fit model:

b. Substrate binds to the enzyme at the active site, forming an enzyme-substrate complex.

d. Substrate binds to the enzyme through non-covalent interactions

Explanation:

Generally, the catalytic power of enzymes are due to transient covalent bonds formed between an enzyme's catalytic functional group and a substrate as well as non-covalent interactions between substrate and enzyme which lowers the activation energy of the reaction. This applies to both the lock-and-key model as well as induced-fit mode of enzyme catalysis.

The lock and key model of enzyme catalysis and specificity proposes that enzymes are structurally complementary to their substrates such that they fit like a lock and key. This complementary nature of the enzyme and its substrates ensures that only a substrate that is complementary to the enzyme's active site can bind to it for catalysis to proceed. this is known as the specificity of an enzyme to a particular substrate.

The induced-fit mode proposes that binding of substrate to the active site of an enzyme induces conformational changes in the enzyme which better positions various functional groups on the enzyme into the proper position to catalyse the reaction.

The qualities Tom Walker and his wife have in common were they both were grasping and without conscience

The question has been asked from the story "The Devil and Tom Walker" by Washington Irving. As the story describes Tom's encounter with the devil, he is a complex character. However, he and his wife seem to complement each other well and have some personality traits in common. Tom and his wife are both miserly, avaricious, cruel, and morally void.

More so than her husband, Tom's stereotypically nagging, scolding wife verbally and perhaps even physically abuses him when she's not hoarding his valuables. Tom's wife courageously decides to accept Old Scratch's offer to sell her husband's soul for money when Tom first rejects it. She takes the family's silver into the swamp with her so she may haggle with the devil.

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Answer:

If it is not proven and if it isn't backed up by any facts or has been proven to be false.

Answer:

Nonmetals

Explanation:

Nonmetals typically lacks the metallic bonding which allows substances to exhibit metallic properties that confers special properties on them.

Nonmetals lacks these properties but metalloids are able to show some of the properties under certain and special conditions.

Answer: the last one

Explanation: if a cell has too little water, it will begin to function incorrectly, and if a cell has too much water it will burst.

The Medal of Honor is the best navy decoration and highest volume.

The President of the USA The Victoria go is the holy grail for Medal of Honor creditors because there are the best in lifestyles. Bearing the inscription For valor and called a VC, this medal turned into first offered for conspicuous bravery' in 1856 and later backdated to the Crimean conflict of 1854. The outstanding service pass is the second maximum army ornament that may be provided to a member of the American military, for intense gallantry and risk of lifestyle in actual combat with an armed enemy force.

The Bronze Star Medal dates lower back to world battle II. these days, it is the fourth-maximum ranking award a provider member can obtain for a heroic and meritorious deed performed in an armed battle. For individuals who acquire the BSM, it's far a sign of their sacrifice, bravery, and honor at the same time as serving their us of a

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To find out how many moles of Iron are in 279 g of it, we need to find Iron atomic mass on the periodic table. It is 55.845 g/mol.

So:

55.845 g --- 1 mol

279 g --- x

x = 5 mol of Fe

Answer: 5 mol Fe

1176 g of H2SO4 is needed to prepare 6.0L of a 2 M H2SO4 solution.

What do you mean by solution?

Solution in chemistry is a homogeneous mixture composed of two or more substances in which the molecules of the solute are completely dispersed in the solvent. Solutions are typically liquid, but can also be solid or gaseous.

We know,

Molarity (M) = moles/volume

Therefore, moles = Molarity x Volume

moles = 2 M x 6 L

moles = 12 moles

1 mole of H2SO4 = 98 g

Therefore, 12 moles of H2SO4 = 12 x 98 g

= 1176 g of H2SO4

Hence, 1176 g of H2SO4 is needed to prepare 6.0L of a 2 M H2SO4 solution.

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Answer: The freezing point of a solution is the temperature at which the solution becomes a solid. The freezing point of a solution is lower than the freezing point of the pure solvent because the solute particles interfere with the movement of the solvent molecules, which slows down the freezing process.

To determine the freezing point of a solution, we can use the freezing point depression equation:

ΔTf = Kf x molality

where ΔTf is the change in freezing point, Kf is the freezing point depression constant for the solvent, and molality is the concentration of the solute in the solution expressed in moles of solute per kilogram of solvent.

To find the freezing point of a 0.520 m aqueous solution of NaCl (sodium chloride), we need to know the freezing point depression constant for water, which is 1.86 °C/m. We can then use the equation above to calculate the change in freezing point:

ΔTf = 1.86 °C/m x 0.520 m = 0.97 °C

To find the freezing point of the solution, we need to subtract the change in freezing point from the freezing point of the pure solvent. The freezing point of pure water is 0 °C, so the freezing point of the 0.520 m aqueous solution of NaCl is:

0 °C - 0.97 °C = -0.97 °C

Answer:

-1.934

Explanation:

0 - {(0.520) x (1.86) x (2)}

Answer:

C. Chemical Bonds are broken

Explanation:

A chemical reaction occurs when chemical bonds are broken.

Chemical reactions occur when chemical bonds between atoms are formed or broken.

Hope this helps :)

Answer:

c: chemical bonds are broken

Explanation:

the broken bonds then create new bonds, rearranging the atoms into a new substance :)