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scoray [572]
3 years ago
10

Read the following passage.

Chemistry
2 answers:
tangare [24]3 years ago
8 0

Answer:

The correct answer is that yes all the scientific theories and their features contributes to the discovery of an atom.

Explanation:

In the beginning, Democritus gave the term atom, however, he gave the wrong theory regarding atom. The term atom is even used at the present time. Aristotle provided the right theory regarding the prevalence of atom. Then Dalton postulated various things in his atomic theory, in which some were accurate, while others were proved later wrong.  

The accurate postulates of Dalton were also incorporated in J.J. Thomson theory of sub-atomic particles. Thus, all the theories associated with an atom provides to its discovery, irrespective of the fact that whether it is correct or wrong.  

Archy [21]3 years ago
7 0

Answer is: the discovery of sub atomic particles like electrons.

J. J. Thomson discovered the electron in 1897.  

His "plum pudding" model (1904) suggested: the electrons are embedded in the positive charge.  

With this model, he abandoned his earlier hypothesis (the atom was composed of immaterial vortices).  

J.J. Thomson placed two oppositely charged electric plates around the cathode ray. He did experiments using different metals as electrode materials and found that the properties of the cathode ray remained constant no matter what cathode material he used.

Tomson concluded that atoms are divisible and that the corpuscles are their building blocks (atoms are made up of smaller particles).  

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Answer:

a. Work, ΔE is negative;

b. Work, ΔE is negative;

c. Work, ΔE is positive.

Explanation:

In the three cases, there is energy exchange in primarily work. The heat is the energy flow because of the difference in temperature. Of course, some heat may be lost in the cases by dissipation.

In the letter <em>a</em> the system is at an initial velocity different from 0, and then it stops. The energy that is represented here is the kinetic energy, which is the energy of the movement. Note that the system goes from a higher velocity to 0, so it is losing kinetic energy, or work, so ΔE = Efinal - Einitial < 0.

In letter <em>b</em>, the system is falling from a certain high to the floor, so its gravitational potential energy is change. That potential energy represents the energy that gravity does when an object shifts vertically. Because it goes from a high to 0, the energy is been lost, so ΔE = Efinal - Einitial < 0.

In letter <em>c</em>, the system is going higher and with higher velocity, so there is a greatness in the gravitational potential energy and the kinetic energy, both works, so ΔE = Efinal - Einitial > 0.

8 0
4 years ago
What is the proper structure for 3-methylpentane? draw the molecule on the canvas by choosing buttons from the tools (for bonds)
Sergio039 [100]
Below is the structure of 3-Methylpentane. The word pentane in name specifies the parent chain which ends on -ane (alkane) and pent- shows number of carbon atoms is parent chain (pent=5). The position of substituent is specified at the start i.e. 3. 

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3 years ago
A chemist heats a fixed amount of gas in a sealed glass container. Which law is the chemist most likely investigating?
fiasKO [112]

Answer:

c

Explanation:

was c the correct answer or not

5 0
3 years ago
Please help also some of them may be multiple choice, thank you.
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Answer: what are the answers to the questions

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Answer:

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Explanation:

According to the diagram depicted, crude oil is separated into its different units using boiling points.

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