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4 years ago

Which of the following best describes the discovery of the atom?

Chemistry

1 answer:

Rasek [7]4 years ago

8 0

Answer:

Its existence was determined by an English scientist studying nature.

Its existence was established after the invention of the microscope.

Explanation:

I know because atoms are made up by a scientist study chemicals while trying to learn about atoms as well.

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For a reaction A + B → products, the following data were collected. Experiment Number Initial Concentration of A (M) Initial Con

Afina-wow [57]

Answer:

Rate constant k = 1.57*10⁻⁵ s⁻¹

Explanation:

Given reaction:

$A\rightarrow B$

Expt [A] M [B] M Rate [M/s]

1 3.40 4.16 1.82*10^-4

2 4.59 4.16 3.32*10^-4

3. 3.40 5.46 1.82*10^-4

$Rate = k[A]^{x}[B]^{y}$

where k = rate constant

x and y are the orders wrt to A and B

To find x:

Divide rate of expt 2 by expt 1

$\frac{3.32*10^{-4} }{1.82*10^{-4} } =\frac{[4.59]^{x} [4.16]^{y} }{[3.40]^{x} [4.16]^{y} }\\\\x =2$

To find y:

Divide rate of expt 3 by expt 1

$\frac{1.82*10^{-4} }{1.82*10^{-4} } =\frac{[3.40]^{x} [5.46]^{y} }{[3.40]^{x} [4.16]^{y} }\\\\y =0$

Therefore: x = 2, y = 0

$Rate = k[A]^{2}[B]^{0}$

To find k

Use rate for expt 1:

$k = \frac{Rate1}{[A]^{2} } =\frac{1.82*10^{-4}M/s }{[3.40]^{2} } =1.57*10^{-5} s-1$

6 0

3 years ago

Explique las diferencias entre mezcla y combinación. De un ejemplo de cada uno.

Brums [2.3K]

Answer:

He means Explain the differences between mix and match. Give one example of each.

Explanation:

3 0

3 years ago

Which of the following measurements is expressed to four significant figures?

yarga [219]

The correct answer isA

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3 years ago

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Which example shows an interaction between the urinary system and the circulatory system?

belka [17]

C. A bee stinging the skin flowing to the kidneys (:

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3 years ago

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arlik [135]

Answer: whats the answer

Explanation:

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3 years ago