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Oksanka [162]
3 years ago
6

Which part of an experiment do scientists change the independent or dependent variable?

Chemistry
1 answer:
Ahat [919]3 years ago
5 0
Scientists change the independent variable; The dependent variable is the one that reacts to the independent variable.
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The rate constant for the second-order reaction !s 0. 54 m-1 s-1 at 300°c. how long (in seconds) would 1t take for the concentra
Jlenok [28]

The answer is 3.63. seconds.

Second order reaction is the reaction in which the rate of reaction depends on either the concentration of two reactant species or on the two times the concentration of single reactant species.

What is the integrated rate law for the second-order reaction?

  • The integrated rate law that relates the concentration, time and rate constant for the second-order reaction is:

\frac{1}{[A]} =\frac{1}{[A]_{0} } +kt

Where

\[\begin{array}{l}{\rm{[A]  -  concentration\ of\ reactant\ A\ at\ time\ t}}\\{{\rm{[A]}}_0}{\rm{ -  initial\ concentration\ of\ reactant\ A}}\\{\rm{t - time}}\\{\rm{k  -  rate\ constant}}\end{array}\]

  • Now, in the given question,

k = 0.54 m^{-1}. s^{-1}

[NO_{2} ]= 0.62\ M

[NO_{2} ]_{0} = 0.28\ M

  • Thus, using the rate law, the time is calculated as-

\frac{1}{0.28\ M} =\frac{1}{0.62\ M } +(0.54 m^{-1}.s^{-1})  t\\\\(0.54 m^{-1}.s^{-1})  t= \frac{1}{0.28\ M} -\frac{1}{0.62\ M } = 1.959 \\\\

Therefore,

t =\frac{1.959}{0.54} = 3.63\ seconds

  • Hence, the it would take 3.63 seconds for the concentration of NO_{2} to decrease from 0.62 M to 0.28 M if the reaction is second order.

To learn more about second order reaction visit:

brainly.com/question/17217385

#SPJ4

3 0
2 years ago
? Question
masya89 [10]

Answer:

Gravity drives all mass wasting.

Explanation:

Mass wasting can be defined as the process of wasting away of earth's outer crust. This movement is also known as slope movement that causes large rock, soil, and debris to move downward, a force driven by gravity.

The term is often used interchangeably with landslide yet it is different. It is also known as mass movement as is cause massive downslope movement of rock, regolith, snow, ice, and-the-like on the earth's outer crust.

<u>All these movements are driven mainly by gravity. Gravity consantly tries to pull the rocks and soil down the slope but the resisting power. also known as shear strength, of moutains helps them to deny the gravitional force.</u>

Thus from the given options the statement that can be said to be true about mass wasting is that mass wasting is driven by gravity. So, the correct option is C.

4 0
3 years ago
Which type of reaction occurs when 50mL quantities of 1 M Ba(OH)2 (aq) and H2SO4 (aq) are combined
iragen [17]
Double replacement.

Ba(OH)2 + H2SO4 ====> 2H2O + BaSO4
5 0
3 years ago
Plz answerrrr I dunnoooo
aleksley [76]
Midnight is your answer.

plz mark as brainliest. i really need it ;-;.

Just ask if you need more help
3 0
3 years ago
Read 2 more answers
What is the correct formula for calcium phosphate?
coldgirl [10]
<span>your answer is Ca3</span>(PO4)2<span>, </span>
6 0
3 years ago
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