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3 years ago

Which of these discoveries contradict components of Dalton’s atomic theory? Check all of the boxes that apply.

Chemistry

2 answers:

34kurt3 years ago

7 0

Answers:

Nuclear reactions can change an atom of one element into an atom of another element. ( fourth choice)

Atoms contain smaller particles: protons, neutrons, and electrons.( first choice)

Atoms of a given element can have different numbers of neutrons.( third choice)

aleksley [76]3 years ago

3 0

Answer:

Atoms contain smaller particles: protons, neutrons, and electrons.

Atoms of a given element can have different numbers of neutrons.

Nuclear reactions can change an atom of one element into an atom of another element.

All atoms of a given element have the same number of protons.

Explanation:

Electrons, protons, and neutrons, and isotopes had not yet been discovered.

The only statement that agrees with Dalton's atomic theory is

B. Atoms of a given element can bond to other atoms only in specific ways. Dalton used this postulate to formulate the Laws of Definite Composition and of Multiple Proportions.

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Boyle's Law states that when a sample of gas is compressed at a constant temperature, the pressure P and volume V satisfy the eq

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The gas is decreasing at a rate of 50 cubic centimeters per minute.

Explanation:

The Boyle's Law is represented by the following expression:

$P\cdot V = k$ (1)

Where:

$P$ - Pressure, in kilopascals.

$V$ - Volume, in cubic centimeters.

$k$ - Proportionality constant, in kilopascal-cubic centimeters.

By definitions of rate of change and implicit differentiation, we derive the following differential equation:

$\dot P \cdot V + P\cdot \dot V = 0$ (2)

Where:

$\dot P$ - Rate of change of the pressure, in kilopascals per minute.

$\dot V$ - Rate of change of the volume, in cubic centimeters per minute.

Then, we clear the rate of change of the volume within (2):

$P\cdot \dot V = -\dot P\cdot V$

$\dot V = -\left(\frac{\dot P}{P} \right) \cdot V$

If we know that $P = 180\,kPa$ , $\dot P = 30\,\frac{kPa}{min}$ and $V = 300\,cm^{3}$ , then the rate of change of the volume is:

$\dot V = -\left(\frac{\dot P}{P} \right) \cdot V$

$\dot V = -50\,\frac{cm^{3}}{min}$

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4 years ago

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