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3 years ago

A brownish fossil that can be found in rock and contains the remains of an organism is

Chemistry

1 answer:

My name is Ann [436]3 years ago

8 0

If it contains a fossil it must be a sedimentary rock.

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In the first order reaction A → products, the initial concentration of A is 0.1 108M, and 44 s later, 0.0554M. What is the initi

lilavasa [31]

Answer : The initial rate of the reaction is, $1.739\times 10^{-3}s^{-1}$

Explanation :

First we have to calculate the rate constant of the reaction.

Expression for rate law for first order kinetics is given by :

$k=\frac{2.303}{t}\log\frac{[A_o]}{[A]}$

where,

k = rate constant = ?

t = time taken for the process = 44 s

$[A_o]$ = initial amount or concentration of the reactant = 0.1108 M

$[A]$ = amount or concentration left time 44 s = 0.0554 M

Now put all the given values in above equation, we get:

$k=\frac{2.303}{44}\log\frac{0.1108}{0.0554}$

$k=0.0157$

Now we have to calculate the initial rate of the reaction.

Initial rate = K [A]

At t = 0, $[A]=[A_o]$

Initial rate = 0.0157 × 0.1108 = $1.739\times 10^{-3}s^{-1}$

Therefore, the initial rate of the reaction is, $1.739\times 10^{-3}s^{-1}$

8 0

3 years ago

For many purposes we can treat propane (CH) as an ideal gas at temperatures above its boiling point of - 42°C. Suppose the tempe

fredd [130]

Answer: The final pressure is 0.81 kPa

Explanation:

The combined gas equation is,

$\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}$

where,

$P_1$ = initial pressure of gas = 0.58 kPa

$P_2$ = final pressure of gas = ?

$V_1$ = initial volume of gas = v

$V_2$ = final volume of gas = $v-\frac{40}{100}\times v=0.6v$

$T_1$ = initial temperature of gas = $25^0C=(25+273)K=298K$

$T_2$ = final temperature of gas = $-22^0C=(-22+273)K=251K$

Now put all the given values in the above equation, we get:

$\frac{0.58\times v}{298}=\frac{P_2\times 0.6v}{251}$

$P_2=0.81kPa$

The final pressure is 0.81 kPa

3 0

3 years ago

?/1

nasty-shy [4]

Answer: The different amount of lights in his classroom

Explanation:it would be the lights because the dependent ariable would be how sleepy his students who get or be

6 0

3 years ago

I really need someone to explain how to find the average atomic mass.... the gizmos was really confusing because they also had w

evablogger [386]

Answer:

Option C. 52.057

Explanation:

The following data were obtained from the question:

Isotope >> Mass number > Percentage

A (Cr-50) > 50 >>>>>>>>>> 4.3

B (Cr-52) > 52 >>>>>>>>>> 83.8

C (Cr-53) > 53 >>>>>>>>>> 9.5

D (Cr-54) > 54 >>>>>>>>>> 2.4

Average atomic mass =?

The average atomic mass of chromium, Cr can be obtained as follow:

Average atomic mass = [(Mass of A × A%) /100] + [(Mass of B × B%) /100] + [(Mass of C × C%) /100] + [(Mass of D × D%) /100]

Atomic mass of Cr = [50×4.3)/100] + [52×83.8)/100] + [53×9.5)/100] + [54×2.4)/100]

= 2.15 + 43.576 + 5.035 + 1.296

Atomic mass of Cr = 52.057

Therefore, the atomic mass of chromium, Cr is 52.057

5 0

3 years ago

What are different kinds of electromagnetic radiation?

MA_775_DIABLO [31]

Radio waves, Micro waves, infrared, visible light, ultra violet, x-rays, and Gamma rays.

4 0

3 years ago

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