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DerKrebs [107]
3 years ago
9

How do catalysts speed up reactions please help quickly

Physics
2 answers:
MissTica3 years ago
8 0
How do catalysts speed up reactions ?
 

by reducing the amount of energy required for the reaction to occur.  other factors such as <span>catalysts' ability to speed a process are temperature, concentration </span>
nikitadnepr [17]3 years ago
7 0

i think its because They lower the energy barrier of a reaction.

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4.72 A full-wave bridge-rectifier circuit with a 1-k load operates from a 120-V (rms) 60-Hz household supply through a 12-to-1 s
melisa1 [442]

Answer:

a) 12.74 V

b) Two pairs of diode will work only half of the cycle

c) 8.11 V

d) 8.11 mA

Explanation:

The voltage after the transformer is relationated with the transformer relationshinp:

V_o=Vrms*\frac{1}{12}\\V_o=10Vrms

the peak voltage before the bridge rectifier is given by:

V_{op}=Vo*\sqrt{2}\\V_{op}=14.14V

The diodes drop 0.7v, when we use a bridge rectifier only two diodes are working when the signal is positive and the other two when it's negative, so the peak voltage of the load is:

V_l=V_{op}-2(0.7)\\V_l=12.74V

As we said before only two diodes will work at a time, because the signal is half positive and half negative,so two of them will work only half of the cycle.

The averague voltage on a full wave rectifier is given by:

V_{avg}=2*\frac{V_l}{\pi}\\V_{avg}=8.11V

Using Ohm's law:

I_{avg}=\frac{V_{avg}}{R}\\\\I_{avg}=8.11mA

7 0
3 years ago
The diagram shows the set-up for an electric doorbell. At bottom, a doorbell. Starting from midright, a wire attached to a conta
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Answer:

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3 years ago
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The record height of a man to date is 8 feet 11 inches​ (107 inches). If all men had identical body​ types, their weights would
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Answer:

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Explanation:

Here it is given that

m\propto h^3

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4 years ago
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Viefleur [7K]

Answer:

Explanation:

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2-cyclo hexanone can be obtained by acid catalyzation of 3-cyclohexanone isomers through the formation of it's "enol".

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3 years ago
You drop two balls from a tower, one of mass m and the other of mass 3m.
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4 years ago
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