Which scientist performed the cathode ray experiment leading to the discovery of electrons
Answers
The scientist that performed the cathode ray experiment leading to the discovery of electrons is the scientist Sir Joseph John Thompson or J.J. Thompson. It was theorized after the discovery that electrons are present in the atom. In this model, the atom is composed mainly of electrons. It was describe as plum pudding because the electrons are dispersed within the atom.
John Thompson is the answer
Related Questions
Describe the chemical process of fermentation.
4 Which quantity represents the number of protons in an atom?(1) atomic number (2) oxidization number (3) number of neutrons (4) number of valence electrons
A student is running an experiment in which 60.3 grams of LiCl is needed, but the only jar of reagent in the lab is labelled lithium chloride monohydrate. How many grams of the hydrate must the student weigh out in order to get the desired amount of the anhydrous compound?
Keisha finds instructions for a demonstration on gas laws.1. Place a small marshmallow in a large plastic syringe. 2. Cap the syringe tightly. 3. Pull the plunger back to double the volume of gas in the syringe. Which best describes the purpose and outcome of the demonstration?
I need to pass this tomorrow
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Answers
The yellow element that stinks when burned is sulfur.
Sulfur is a chemical element with the symbol S and atomic number 16. It is a non-metal that is a member of the chalcogen group in the periodic table. Sulfur is a yellow solid at room temperature. It is insoluble in water but soluble in carbon disulfide. When sulfur is burned, it produces a foul-smelling gas called sulfur dioxide.
Sulfur dioxide is a colorless gas with a pungent, irritating odor. It is a major air pollutant and can cause respiratory problems. Sulfur is used in a variety of applications, including the production of sulfuric acid, gunpowder, and rubber. It is also used in the vulcanization of rubber. Sulfur dioxide is a highly reactive gas. Sulfur dioxide has a low boiling point. Sulfur dioxide is heavier than air.
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a neutralization reaction
a reaction in which oxidation numbers change
a reaction in which no electrons are transferred.
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A reaction where oxidation numbers change.
A reduction is when electrons are gained while oxidation is when electrons are lost.
b. period number.
c. number of protons.
d. number of valence electrons.
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The chemical properties of an element are largely determined by the number of valence electrons. Thus option D is correct.
what are valence electron ?
Valence electrons an atom is defined as the number of electron which lose or gain the nearest noble gas or inert gas electronic configuration.
The valence electrons are the main part of chemical reactions as these contain more energy as compared to the electrons present in inner orbits.
The number of valence electrons present helps to determine the chemical properties of element like valence or valency, bonds with other elements.
It also show a picture of the mechanism of bond formation of an atom, the number of unpaired electrons and how many atoms can take part.
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Answers
Chemb.01.08.3b
Chemb.01.08.3c******
Chemb.01.08.3d
4. What happens to the partial pressure of oxygen in a sample of air if the temperature is increased?
It increases.
It stays the same.
It decreases.
The change cannot be determined. ******
5. A breathing mixture used by deep-sea divers contains helium, oxygen, and carbon dioxide. What is the partial pressure of oxygen at 101.4 kPa if PHe = 82.5 kPa andChemb.01.08.06= 0.4 kPa?
82.9 kPa******
19.3 kPa
18.5 kPa
101.0 kPa
6. Which of the following gases is the best choice for inflating a balloon that must remain inflated for a long period of time?
argon
oxygen
hydrogen *****
neon
Answers
Correct Answer: The average kinetic energy of the gas decreases.
Reason:
From the ideal gas equation, we know that PV = nRT
where, P = pressure, V = volume, n = number of moles of gas, R = gas constant and T = temperature.
From above equation, it can be seen that, Temp. as a direct relation with Pressure and Volume. Hence, as temperature of the gas in a balloon decreases, pressure and volume also decreases.
Also, from kinetic theory of gases, we know that, kinetic energy of gas increases with increasing temp. Hence, average kinetic energy of the gas decreases with decreasing temp.
Answer 2:
Correct answer: Out
Reason:
From the ideal gas equation, we know that PV = nRT
where, P = pressure, V = volume, n = number of moles of gas, R = gas constant and T = temperature.
Therefore, when a sealed syringe is heated, it's temp. will increase. This, will result in expansion of gas i.e volume will increase. Hence, syringe plunger move in outwards direction.
Answer 3: Volume = 6046 L
Reason:
From the ideal gas equation, we know that PV = RT
where, P = pressure, V = volume, R = gas constant and T = temperature.
Given: P1 = 99 kPa, V1 = 3000 L, T1 = 312 K, P2 = 45.5 KPa and T2 = 289 K.
Therefore, we have:
Thus,
Hence, V2 = 6046 L
Answer 4:
Correct Answer: It increases
Reason:
We know that, pressure of gas, it directly proportional to temp. Hence, when the temp. of as is increases. Total pressure of gas mixture increases. This is because, partial pressure of individual component (in present case oxygen) increases.
Answer 5:
Correct answer: 18.5 kPa
Reason:
We know that, total pressure is the sum of the partial pressures of the gases present in it. Mathematically, it can be expressed as:
Ptot = PO2 + PHe + PCO2
Therefore, partial pressure of oxygen, PO2:
PO2 = Ptot − PHe − PCO2
= 101.4 − 82.5 − 0.4
=18.5 kPa.
Answer 6:
Correct Answer: Argon
Reason:
Inert gases are the best choice for inflating a balloon that must remain inflated for a long period of time. Among given options, both neon and argon are inert gas, But, atomic weight of Ar is 40g/mol, while is more than that of neon (20 g/mol). Hence,. Argon gas is preferred over neon gas.1. As the temperature of the gas in a balloon decreases, the average kinetic energy of the gas decreases.
2. The direction in which the syringe plunger would move is Out.
3. The volume of the balloon under these new conditions would be calculated using the following conversion factor ratios 6046 L.
4. It increases
5. 18.5 kPa
6. Argon
What is the average kinetic energy?
The average kinetic energy is the one and a half of the mass (m) of each gas molecule multiplied by the square of the RMS speed (vrms). There is a relationship between the pressure of a gaseous substance and the temperature of a gas.
Given the pressure of the gas in question 2, we can expect the direction in which the syringe plunger would move to be out.
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