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2 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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The temperature of a heat engine is 500k some of the heat generated by the engine flows to the surroundings which are at a temp

Ierofanga [76]

1-125/500)x100=efficiency

1-1/4)x100 =75pc

3 0

1 year ago

An electron moving parallel to a uniform electric field increases its speed from 2.0 × 107 m/s to 4.0 × 107 m/s over a distance

jeka94

Answer:

$1.8\times 105 N/C$

Explanation:

We are given that

$u=2\times 10^7 m/s$

$v=4\times 10^7 m/s$

d=1.9 cm= $\frac{1.9}{100}=0.019 m$

Using 1m=100 cm

We have to find the electric field strength.

$v^2-u^2=2as$

Using the formula

$(4\times 10^7)^2-(2\times 10^7)^2=2a(0.019)$

$16\times 10^{14}-4\times 10^{14}=0.038a$

$0.038a=12\times 10^{14}$

$a=\frac{12}{0.038}\times 10^{14}=3.16\times 10^{16}m/s^2$

$q=1.6\times 10^{-19} C$

Mass of electron,m $=9.1\times 10^{-31} kg$

$E=\frac{ma}{q}$

Substitute the values

$E=\frac{9.1\times 10^{-31}\times 3.16\times 10^{16}}{1.6\times 10^{-19}}$

$E=1.8\times 105 N/C$

7 0

2 years ago

A certain 100W light bulb has an efficiency of 95%. How much thermal energy will this light bulb add to the inside of a room in

Usimov [2.4K]

Since the bulb consumes 100 watts of power and its efficiency is 95%,
it generates 95 watts of light energy and 5 watts of heat energy whenever
it's turned on.

5 watts means 5 joules of energy per second.

(2.5 hours) x (3,600 seconds/hour) = 9,000 seconds

(9,000 seconds) x (5 joules/second) = 45,000 joules of heat in 2.5 hours

7 0

2 years ago

A receptor that contains many mechanically-gated ion channels would function BEST as a ____________.

anastassius [24]

A receptor that contains many mechanically-gated ion channels would function BEST as a <span>tactile receptor.</span>

8 0

2 years ago

Older televisions display a picture using a device called a cathode ray tube, where electrons are emitted at high speed and coll

Vaselesa [24]

Answer:

a) $3*10^{-9}\ s$

b) 2.36 cm

Explanation:

a) The horizontal distance = x = 6 cm

1 cm = 0.01 m

6 cm = 6 cm * 0.01 m/cm = 0.6 m

Therefore the time taken (t) by the electron to travel from the emission point to the screen can be gotten from:

x = t * $V_i$

$V_i=initial\ velocity=2*10^7\ m/s$

$x=tV_i\\\\t=\frac{x}{V_i}\\ \\t=\frac{0.06}{2*10^7}\\ \\t=3*10^{-9}\ m/s$

b) The vertical distance (y) traveled by the electon before it hits the screen is given by:

$y=\frac{1}{2}at^2\\ \\a=upward\ acceleration=5.25*10^{15}\ m/s^2\\\\Substituting:\\\\y=\frac{1}{2}*5.25*10^{15}* (3*10^{-9})\\\\y=0.0236\ m\\y=2.36\ cm$

5 0

2 years ago