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Anna35 [415]
3 years ago
5

What is the independent variable? (For science)

Chemistry
1 answer:
DiKsa [7]3 years ago
6 0

Answer:

The independent variable is what you change in the experiment.

Explanation:

The independent determines the dependent variable.

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The decomposition of hydrogen peroxide follows first order kinetics and has a rate constant of 2.54 x 10-4 s-1 at a certain temp
Eva8 [605]

Answer:

[A]_0=0.400M

Explanation:

Hello.

In this case, since the first-order reaction is said to be linearly related to the rate of reaction:

r=-k[A]

Whereas [A] is the concentration of hydrogen peroxide, when writing it as a differential equation we have:

\frac{d[A]}{dt} =-k[A]

Which integrated is:

ln(\frac{[A]}{[A]_0} )=-kt

And we can calculate the initial concentration of the hydrogen peroxide as follows:

[A]_0=\frac{[A]}{exp(-kt)}

Thus, for the given data, we obtain:

[A]_0=\frac{0.321M}{exp(-2.54x10^{-4}s^{-1}*855s)}

[A]_0=0.400M

Best regards!

3 0
3 years ago
Cual es el numero de oxidacion de la respiración​
Vinil7 [7]
The answer is 0 if im right
3 0
3 years ago
Why is the chemical formula 2C NOT an example of a diatomic molecule?
katen-ka-za [31]
Because it represents 2 atoms of carbon not 2 molecules of carbon
8 0
3 years ago
Read 2 more answers
The density of whole blood is 1.05 g/ml. a typical adult has between 4.7 and 5.5 l of whole blood. what is the mass in pounds of
Kisachek [45]
<span>1.05 g/ml * 1000 ml = 1050g/l because of 1g/ml = 1 kg/l so, a/q mass of 4.7 l of whole blood in pound = 4.7 * 1050 = 4935 g so in pound 4935g = 10.87981p</span>
5 0
3 years ago
What is the mass of CO2 lost at 20 min from the limestone sample?
harkovskaia [24]

Answer:

The mass, CO2 and CO3 from the limestone sample is discussed below in details.

Explanation:

(A) mass loss of sample of limestone after 20 min

= 0.8437g-0.5979g = 0.2458 g

From the given reaction of limestone, 2 mol of the sample gives 2 moles of CO 2.

Therefore  

184.4 g ( molar mass of limestone) gives2× 44 g of carbon dioxide.

1 g of sample gives 88/184.4 g of carbon dioxide

Hence 0.2458 g sample gives

= 88/184.4 × 0.2458 g = 0.117 g carbon dioxide

(B) mole of CO 2 lost = weight/ molar mass

= 0.117 g / 44 g/mol =0.0027 mole

(C). 1 mol of limestone contain 2 mol of carbonate ion

From the reaction we know that carbonate ion of limestone is converted into carbondioxide

Hence lost carbonate ion = 0.2458 g

(D) we know that

1 mol limestone contain 1mol CaCO​​​ 3

Hence in sample present CaCO​​​ 3

= 1mole / 184.4 g × 0.8437 g= 0.00458 mol CaCO​​​3

8 0
3 years ago
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