Michael D.

Organic Chemistry Acid Base Reaction Mechanism

07/07/19

Why concentrated sulfuric acid for dehydration and dilute for hydration?

To dehydrate ethanol one uses concentrated sulfuric acid: $$\\ce{C2H5OH ->[\ ext{conc.} H2SO4] C2H4 + H2O}$$ but to go in the reverse direction, dilute sulfuric acid is used: $$\\ce{C2H4 +... more

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Calculus Physics Velocity

07/02/19

Calculus Velocity

The position of an object moving along a line is given by the function s(t)=−14t2+140t. Find the average velocity of the object over the following intervals.(a) [1, 55](b) [1, 44](c) [1,... more

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Chemistry

06/28/19

calculate the freezing point of solution perpared by dissolving 4.5g of gulcose ( m.mass = 180g per mol) in 250 g of bromo form . Given freezing point of bromo form = 7.8°C and Kf for bromo form =... more

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Organic Chemistry Stereoelectronics

06/24/19

How are SN2 transition states stabilised by adjacent double bonds and carbonyl groups?

It is my understanding that transition states in an S<sub>N</sub>2 reaction have some filled and some empty orbital character, as we have the backside of the **C-X σ*** beginning to... more

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Geometry

06/19/19

How do I simplify(a-b)×(a+b), where a and b are vectors?

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Precalculus

06/15/19

Suppose Sarah wants to build and enclose a rectangular fence in her backyard for planting fruits with only 3,250 feet of wire fencing. (Hint: all sides of the fence must be taken into consideration)

a) Find the area of the rectangular fence as a quadratic function in terms of length.b) Find the length of the rectangular fence. Note: do not solve this statement by using any methods from... more

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Algebra 2 College Algebra

06/14/19

college algebra question

A varsity soccer player kicks a soccer ball approximately straight upward with an initial velocity of 68 ft/sec. The ball leaves the players foot at a height of 3 feet. Part 1 of 2: (2 pts)Use the... more

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Math Algebra 2

06/14/19

i need help on my math question

help me find an equation for the line perpendicular to the line x + 9y = 7 having the same y-intercept as 2x-2y = 4

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Physics Acceleration

06/14/19

What is the acceleration of the rocket?

A rocket is fired upwards, starting at rest, and accelerating at a constant rate. During the 15th 1 second interval, the rocket travels 600 meters. What is the acceleration of the rocket?Please... more

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Physics

06/12/19

Physics 1 word problem: I am in need of assistance pls

Captain Curious is attempting to launch Bad Guy into deep space, where he will never be able to hurt anyone again. The probe and Bad Guy have a total mass of 450 kg, and the rocket has an exhaust... more

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Physics

06/10/19

Calculate the mass and volume of zinc required to give rise to 50 grams of zinc sulphate when zinc reacts with sulphuric acid.(at.wt of zn-65u,at.wt of S 32u

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Chemistry

06/10/19

What is the mass of 5.2 moles of NaF?

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Algebra 2 Physics Algebra

06/08/19

A projectile is fired straight up from ground level. After t seconds its height s, in feet above the ground, is given by s=350t-16t^2.

A projectile is fired straight up from ground level. After t seconds its height s, in feet above the ground, is given by s=350t-16t^2. During what time interval is the projectile more than 1250 ft... more

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Math Physics Astronomy

05/12/19

Asteroid collision

A warning system has calculated that two asteroids will collide not far from Earth any time soon.The smaller asteroid has the massmandmoves with the velocity vm. The bigger asteroid has themassM =... more

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Integral Calculus

04/26/19

distance as a function of initial velocity and constant power

Mass M with initial velocity =Vo represented by initial energy = Eo => Vo=sqrt(2/M*Eo).Energy (and velocity) increase as constant power applied: e(t)=Pt + Eo => v(t)=sqrt[ 2/M* ( Pt + Eo... more

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Physics

04/12/19

Why do we fall down when the bicycle slows down?

My question is: It is easy to balance a bicycle when it is moving at a fairly high velocity, say 7 m/s or 25 km/hr. But when a bicycle slows down, it is hard to keep it upright, and the person... more

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Precal

01/20/16

Find the work done by a force F of 45 pounds acting at an angle of 127 degrees in moving an object from (1,2) to (-3,7)

Need help on this question

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General Chemistry Chem Lab Chem 2 Help

01/20/16

CHEMISTRY PLEASE HELP!!!!!!! Calculate the concentration of a crystal violet solution prepared by diluting 4.0 mL of 1.0 x 10^-4 M crystal viole...

Calculate the concentration of a crystal violet solution prepared by diluting 4.0 mL of 1.0 x 10^-4 M crystal violet with 2.0 mL of 0.100 M NaOH and 4.0 mL of distilled water. I am so so so... more

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Sullivan Ch 4

01/20/16

Rectangle algebra

Farmer Ed has7500 meters of fencing, and wants to enclose a rectangular plot that borders on a river. If Farmer Ed does not fence the side along the river, what is the largest area that can be... more

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System Of Linear Equations

01/20/16

How much does each gallon of paint and each brush cost?

You purchase 8 gallons if paint and 3 brushes for $152.50. The next day, you purchase 6 gallons of paint and 3 brushes for $113.00. How much does each gallon of paint and each brush cost?

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Algabra

01/20/16

The length of a rectangle is 4 less than its width. If the area is 117 sq. meters, find its dimensions.

The length of a rectangle is 4 less than its width. If the area is 117 sq. meters, find its dimensions. dont know how to do this need help

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Pythagorean Theorem

01/20/16

Through cunning use of Pythaogoras' Theorem, prove that aliens do not exist.

Please anybody answer this question .I don not know the answer of this question, I hope anybody will answer my question. Thank You !!!!

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Answers •2

Why concentrated sulfuric acid for dehydration and dilute for hydration?

Calculus Velocity

colligative properties

How are SN2 transition states stabilised by adjacent double bonds and carbonyl groups?

How do I simplify(a-b)×(a+b), where a and b are vectors?

Suppose Sarah wants to build and enclose a rectangular fence in her backyard for planting fruits with only 3,250 feet of wire fencing. (Hint: all sides of the fence must be taken into consideration)

college algebra question

i need help on my math question

What is the acceleration of the rocket?

Physics 1 word problem: I am in need of assistance pls

Calculate the mass and volume of zinc required to give rise to 50 grams of zinc sulphate when zinc reacts with sulphuric acid.(at.wt of zn-65u,at.wt of S 32u

What is the mass of 5.2 moles of NaF?

A projectile is fired straight up from ground level. After t seconds its height s, in feet above the ground, is given by s=350t-16t^2.

Asteroid collision

distance as a function of initial velocity and constant power

Why do we fall down when the bicycle slows down?

Find the work done by a force F of 45 pounds acting at an angle of 127 degrees in moving an object from (1,2) to (-3,7)

CHEMISTRY PLEASE HELP!!!!!!! Calculate the concentration of a crystal violet solution prepared by diluting 4.0 mL of 1.0 x 10^-4 M crystal viole...

Rectangle algebra

How much does each gallon of paint and each brush cost?

The length of a rectangle is 4 less than its width. If the area is 117 sq. meters, find its dimensions.

Through cunning use of Pythaogoras' Theorem, prove that aliens do not exist.

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Michael D.

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