3 years ago

Why is a solution of 4% acetic acid in 95% ethanol used to wash the crude aldol-dehydration product?

1 answer:

5 0

A cold acetic acid solution is used to wash the residue of the reagent in preparation of an aldol condensation product after vacuum filtration. The main reason in washing with the acetic acid rinse is to neutralize any sodium hydroxide.

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In Fraunhofer diffraction wave front used is __________. A. Spherical B. Circular C. Plane D. Conical

Zepler [3.9K]

I am pretty sure the answer is C.

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2 years ago

A diesel engine a. uses only air during the intake stroke. b. is an external-combustion engine. c. uses a spark plug to ignite f

Mariana [72]

Question : A diesel engine?

Logical Answer : a. uses only air during the intake stroke.

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3 years ago

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Power = work+ time work time time work Fxd Ext Fxd

maw [93]

Power is equal to the rate of energy usage, or work over time (W/t). It could also be consider Fd/t, since W=Fd.

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3 years ago

If an object moving at 5 m/s accelerates for 30 seconds at a rate of 2

klasskru [66]

Answer:

V=u + at

V= final velocity

U= Initial velocity

a= acceleration

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V= 5 + 30*2

V=5+60

V=65m/s

Explanation:

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3 years ago

The energy of an electromagnetic wave changes proportionally to which

ozzi

Answer:

D. Frequency

Explanation:

The energy of an electromagnetic wave is proportional to frequency, mathematically it is expressed as;

E ∝ f

E = hf

where;

h is Planck's constant = 6.626 x 10⁻³⁴ Js

The equation above can also be expanded to;

$E = hf = h \frac{c}{\lambda}$

where;

c is speed of light = 3 x 10⁸ m/s

λ is the wavelength of the electromagnetic wave

Since the speed of light is constant, we can conclude that the energy of the electromagnetic wave is directly proportional to its frequency and inversely proportional to its wavelength.

Therefore, the correct option for direct proportionality is FREQUENCY

8 0

3 years ago