Joseph P.

Organic Chemistry

09/03/23

Determination of Ethanol by Distillation

Would a mixture of water/ethanol show a positive or negative deviation from Raoult's law?

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Physics

03/29/23

physics questions----

3.A softball player swings a bat, accelerating it from rest to 3.0 rev/s in a time of 0.20 s. Approximate the bat as a 2.2 kg uniform rod of length 0.95 m, and compute the torque the player applies... more

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Chemistry

02/02/23

The reaction A + 2 B → C has the rate law rate = k[A][B]. By what factor does the rate of reaction increase when both [A] and [B] are doubled?

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Biology

01/31/23

The molecular formula for the amino acid lysine is C6H14N2O2.

The molecular formula for the amino acid lysine is C6H14N2O2. What would be the molecular formula for a polypeptide consisting of five lysine molecules?

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Chemistry

01/31/23

Calculate the enthalpy of combustion

Calculate the enthalpy of combustion (kJ/mol) of cetane (C₁₆H₃₄), an analogous component in diesel fuel to octane in gasoline, given the following standard enthalpies of formation: CO₂(g) = -393.5... more

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Chemistry

01/31/23

I₂(g) ⇌ 2 I(g) The Kc of this reaction is 3.820 × 10⁻⁵ at 741.0 °C.

Consider the reaction below: I₂(g) ⇌ 2 I(g) The Kc of this reaction is 3.820 × 10⁻⁵ at 741.0 °C. What is Kp at the same temperature for the reverse reaction? Note Kc is often called K. (R = 0.08206... more

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Chemistry

01/31/23

Pieces of potassium (Φ = 3.68 × 10–19 J) and sodium (Φ = 4.41 × 10–19 J) metal are exposed to radiation of wavelength 290.0 nm.

What is the velocity of the electrons from sodium?What is the velocity of the electrons from potassium?

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Chemistry

01/31/23

The activation energy Ea for a particular reaction is 50.0 kJ/mol. How much faster is the reaction at 320 K than at 310.0 K? (R = 8.314 J/mol • K)

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Chemistry

01/28/23

Tungsten crystallizes in a body-centered cubic unit cell with an edge length of 3.165 Å.

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Chemistry

01/28/23

What is the solubility of Mg(OH)₂ at a pH of 12.00? (Ksp Mg(OH)₂ is 1.6 × 10⁻¹³)

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Physics

01/28/23

What is the magnitude of the force between an ion of charge 5e and an ion of charge -1e if their separation is 0.62 nm?

What is the magnitude of the force between an ion of charge 5e and an ion of charge -1e if their separation is 0.62 nm?F magnitude = ???Is this force attractive or repulsive? I got -1.17e+29 N as... more

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Physics

01/28/23

Two equal charges, of charge q each, experience a repulsive force of 4.3 N when separated by 15 cm. If q is positive, what is its value?

Two equal charges, of charge q each, experience a repulsive force of 4.3 N when separated by 15 cm. If q is positive, what is its value?q = ___ 𝜇CI get 9.30e+10 C which is obviously not correct... more

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Chemistry

01/23/23

What is the change in energy (in J) for an electron in a hydrogen atom when it relaxes from n=5 to n=2?

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Answers •1

Chemistry

01/23/23

A neutral isotope has a mass number of 65 and 36 neutrons. Identify the element symbol of this isotope and determine the number of protons and electrons.

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Answers •2

Physics

01/23/23

A 1.6 kg ball strikes a wall with a velocity of 9.2 m/s to the left.

The ball bounces off with a velocity of 8 m/s to the right. If the ball is in contact with the wall for 0.21 s, what is the constant force exerted on the ball by the wall?

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Physics

01/22/23

The magnetic field at the center of a 0.500-cm-diameter loop is 2.00 mT .

What is the current in the loop?

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Chemistry

01/22/23

We need to make 350mL of a solution with 3mM Lead Nitrate, 50mM of Tris Base, and 0.01M KH2PO4. How much of each component are needed (including water)?

We need to make 350mL of a solution with 3mM Lead Nitrate, 50mM of Tris Base, and 0.01M KH2PO4. How much of each component are needed (including water)?Lead (II) Nitrate MW: 331.2 g/moleTris Base... more

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Biochemistry

01/22/23

What is the importance of the buffering effect of the pair of chemical species H2PO4-/HPO42- for the human body?

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Chemistry

01/22/23

The rate constant for the low pressure decomposition of N₂O₄(g) is 3.60 × 10⁴ L･mol⁻¹･s⁻¹ at 250 K. If the

The rate constant for the low pressure decomposition of N₂O₄(g) is 3.60 × 10⁴ L･mol⁻¹･s⁻¹ at 250 K. If the initial pressure of N₂O₄(g) is 35.0 torr at 250 K, what is the pressure of N₂O₄(g)... more

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Organic Chemistry

01/21/23

ORGANIC CHEMISTRY

What type of organic reaction occurs when water is released as two functional groups bond together?

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Chemistry Biochemistry

01/20/23

chemistry question

Aqueous hydrobromic acid HBr will react with solid sodium hydroxide NaOH to produce aqueous sodium bromide NaBr and liquid water H2O.Suppose 75.2 g of hydrobromic acid is mixed with 65. g of sodium... more

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Physics

01/20/23

stick collision

A 2500 kg van runs into the back of a 700 kg compact car at rest. They move off together at 8 m/s. Assuming no friction with the ground, find the initial speed of the van. m/s

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Chemistry

01/20/23

S + 6 HNO3 --> H2SO4 + 6 NO2 + 2 H2O In the above equation how many moles of water can be made when 135.8 grams of HNO3 are consumed?

S + 6 HNO3 --> H2SO4 + 6 NO2 + 2 H2OIn the above equation how many moles of water can be made when 135.8 grams of HNO3 are consumed?Round your answer to the nearest tenth. If you... more

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Physics

01/19/23

Tom has his friend Steve give him an initial push uphill. After the initial push, Steve just let's Tom "coast" up the hill

Steve pushes the sled with an initial speed of 3.7 m/s up a 33° incline. The combined mass of Tom and the sled is 19.2 kg, and the coefficient of kinetic friction between the sled and the incline... more

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Physics

01/19/23

A 45 kg woman jumps from a ledge that is 1.2 m above concrete.

(a) What is her speed just before her feet strike the pavement?(b) The only cushion for her feet is the 0.50 cm in the pads of her feet. So, she displaces only 0.50 cm during the landing.... more

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Determination of Ethanol by Distillation

physics questions----

The reaction A + 2 B → C has the rate law rate = k[A][B]. By what factor does the rate of reaction increase when both [A] and [B] are doubled?

The molecular formula for the amino acid lysine is C6H14N2O2.

Calculate the enthalpy of combustion

I₂(g) ⇌ 2 I(g) The Kc of this reaction is 3.820 × 10⁻⁵ at 741.0 °C.

Pieces of potassium (Φ = 3.68 × 10–19 J) and sodium (Φ = 4.41 × 10–19 J) metal are exposed to radiation of wavelength 290.0 nm.

The activation energy Ea for a particular reaction is 50.0 kJ/mol. How much faster is the reaction at 320 K than at 310.0 K? (R = 8.314 J/mol • K)

Tungsten crystallizes in a body-centered cubic unit cell with an edge length of 3.165 Å.

What is the solubility of Mg(OH)₂ at a pH of 12.00? (Ksp Mg(OH)₂ is 1.6 × 10⁻¹³)

What is the magnitude of the force between an ion of charge 5e and an ion of charge -1e if their separation is 0.62 nm?

Two equal charges, of charge q each, experience a repulsive force of 4.3 N when separated by 15 cm. If q is positive, what is its value?

What is the change in energy (in J) for an electron in a hydrogen atom when it relaxes from n=5 to n=2?

A neutral isotope has a mass number of 65 and 36 neutrons. Identify the element symbol of this isotope and determine the number of protons and electrons.

A 1.6 kg ball strikes a wall with a velocity of 9.2 m/s to the left.

The magnetic field at the center of a 0.500-cm-diameter loop is 2.00 mT .

We need to make 350mL of a solution with 3mM Lead Nitrate, 50mM of Tris Base, and 0.01M KH2PO4. How much of each component are needed (including water)?

What is the importance of the buffering effect of the pair of chemical species H2PO4-/HPO42- for the human body?

The rate constant for the low pressure decomposition of N₂O₄(g) is 3.60 × 10⁴ L･mol⁻¹･s⁻¹ at 250 K. If the

ORGANIC CHEMISTRY

chemistry question

stick collision

S + 6 HNO3 --> H2SO4 + 6 NO2 + 2 H2O In the above equation how many moles of water can be made when 135.8 grams of HNO3 are consumed?

Tom has his friend Steve give him an initial push uphill. After the initial push, Steve just let's Tom "coast" up the hill

A 45 kg woman jumps from a ledge that is 1.2 m above concrete.

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