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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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A 30.g sample of Al(s) is heated to 50°C and placed in a calorimeter containing 150g of water at 20°C. As the system approaches
SpyIntel [72]

Energy is transferred from the Al (solid) to water and the temperature of the water increases while the temperature of the Al (solid) decreases.

<h3>Heat energy</h3>

Heat energy is a form of energy transferred from one body to another due to a temperature difference between the bodies.

Heat energy is also known as thermal energy.

In heat transfer, heat is transferred from a body at higher temperature to a body at lower temperature.

In the heat transfer between the heated aluminium and the water, the solid aluminium is at a higher temperature than the water, hence, heat energy is transferred from the aluminium to water.

Therefore heat energy is transferred from the Al (solid) to water and the temperature of the water increases while the temperature of the Al (solid) decreases.

Learn more about about heat transfer at: brainly.com/question/12072129

5 0
2 years ago
What is the volume of a gas at 253K if the gas occupies 50.0 mL at a temp of 273K? Provided
aivan3 [116]

Answer:

V₂ = 46.34 mL

Explanation:

Given data:

Initial temperature = 273 K

Initial volume = 50.0 mL

Final temperature = 253 K

Final volume = ?

Solution:

The given problem will be solve through the Charles Law.

Charles Law

"The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure"

Mathematical expression:

V₁/T₁ = V₂/T₂

V₁ = Initial volume

T₁ = Initial temperature

V₂ = Final volume  

T₂ = Final temperature

by putting values in formula,

V₁/T₁ = V₂/T₂

V₂ = V₁T₂/T₁  

V₂ = 50.0 mL × 253 K / 273 k

V₂ = 12650 mL.K / 273 K

V₂ = 46.34mL

7 0
2 years ago
When HCl(g) reacts with NH3(g) to form NH4Cl(s), 42.1 kcal of energy are evolved for each mole of HCl(g) that reacts. Write a ba
stich3 [128]

<u>Answer:</u> The chemical equation is HCl(g)+NH_3(g)\rightarrow NH_4Cl(s)+42.1kCal

<u>Explanation:</u>

There are 2 types of reactions that are classified based on enthalpy change:

  • Endothermic reaction
  • Exothermic reaction

Endothermic reactions: They are defined as the reactions where heat is absorbed by the reaction. The change in enthalpy of the reaction is always positive.

Exothermic reactions: They are defined as the reactions where heat is released by the reaction. The change in enthalpy of the reaction is always negative.

Given values:

Energy released for 1 mole of HCl reacted = -42.1 kCal

The chemical equation for the formation of ammonium chloride follows:

HCl(g)+NH_3(g)\rightarrow NH_4Cl(s)+42.1kCal

8 0
2 years ago
What could you do in an experiment to get more accurate results?
marissa [1.9K]
I believe it’s b, correct me if i’m wrong
4 0
3 years ago
Read 2 more answers
You wish to analyze the purity of a compound via TLC. If you wanted polar compounds to remain near the bottom (baseline) of the
nikklg [1K]

Options:

A reverse phase TLC plate because the nonpolar stationary phase will interact with polar compounds more strongly.

A normal phase TLC plate because the polar stationary phase will interact with polar compounds more strongly.

A reverse phase TLC plate because the polar stationary phase will interact with polar compounds more strongly.

A normal phase TLC plate because the nonpolar stationary phase will interact with nonpolar compounds more strongly.

Answer:A normal phase TLC plate because the polar stationary phase will interact with polar compounds more strongly.

Explanation:TLC(THIN LAYER CHROMATOGRAPHY) is a solid (stationary phase) and a liquid(mobile phase) technique of separation and purity determination that uses the principle of that different compounds have different adsorption rate and different solubility rate to the two phases between which they are partitioned.

ON A DEVELOPED THIN LAYER CHROMATOGRAPHIC PLATE A PURE COMPOUND WILL APPEAR ONLY ON ONE SPOT.

With TLC one can analyse multiple samples at the same time.

7 0
2 years ago
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