3 years ago

___ replacement involves one element replacing another element in a compound.

Chemistry

2 answers:

Marysya12 [62]3 years ago

5 0

Answer: Single replacement

Solnce55 [7]3 years ago

4 0

Answer:

single

Explanation:

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A sample of milk kept at 25 °C is found to sour 40 times as rapidly as when it is kept at 4 °C. Estimate the activation energy f

irga5000 [103]

Answer:

120.575 kJ is the activation energy for the souring process.

Explanation:

The formula for an activation energy is given as:

$\log (\frac{K_2}{K_1})=\frac{Ea}{2.303\times R}[\frac{1}{T_1}-\frac{1}{T_2}]$

where,

$K_1$ = rate constant at $25^oC$ = $40k$

$K_2$ = rate constant at $4^oC$ = $k$

$Ea$ = activation energy for the reaction = ?

R = gas constant = 8.314 J/mole.K

$T_1$ = initial temperature = $25^oC=273+25=298 K$

$T_2$ = final temperature = $4^oC=273+4=277 K$

Now put all the given values in this formula, we get:l

$\log (\frac{k}{40k})=\frac{Ea}{2.303\times 8.314 J/mol K}[\frac{1}{298K}-\frac{1}{277 K}]$

$E_a=120,575.61J=120.575 kJ$

120.575 kJ is the activation energy for the souring process.

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3 years ago

A substance that contains various elements or compounds without bonding or fixed proportions is a(n) _____.

Flauer [41]

Is a mixture! .......

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Electron configuration of ag

stepladder [879]

Silver/Electron configuration

[Kr] 4d¹⁰ 5s¹

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