The electron configuration 1sÆ 2sÆ2pÒ 3sÆ3pÒ represents which noble gas?

Answers

Answer 1

Answer: This noble gas is argon (Ar), because its third energy level is full.

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write a balanced chemical equation for the reaction of zncl2 with excess NaOH to produce Na2Zn(oh)4 sodium zincate. what mass of sodium zincate can be produced from 2.00 g of ZNCl2 with excess Naoh by this reaction?

Answers

$4NaOH _((aq)) + ZnCl_(2)_((aq)) ----\ \textgreater \ Na_(2)Zn(OH)_(4)_((ppt)) + 2NaCl (aq)$

$mol = (mass)/(molar mass)$
∴ $mol of ZnCl_(2) = (2.00 g)/([(65)+(35.5 * 2)g/mol)$
= $(2.00 g)/(136 g/mol)$
= 0.0147 mol

$Moles of Na_(2)Zn(OH)_(4) :$
$ratio of ZnCl_(2) : Na_(2)Zn(OH)_(4)$
1 : 1
∴ $Moles of Na_(2)Zn(OH)_(4) <span>$ = 0.0147 mol

Mass = Molar Mass * Mol
∴ $Mass of Na_(2)Zn(OH)_(4) <span>$ = [(23 * 2)+(65)+(16 * 4) + (1*4)] g/mol * 0.0147 mol
= 179 g/mol * 0.0147 mol
= 2.63 g

If each fission reaction in a nuclear reactor emits three neutrons, how many neutrons are produced from three fission reactions? one
three
six
nine

Answers

Answer : The correct option is, Nine.

Explanation :

Nuclear fission : It is defined as the splitting of bigger nuclei into two smaller nuclei. During this process neutrons and some energy also released.

In nuclear reactor, neutron hits the uranium nucleus, the uranium nucleus splits into two nuclei and three neutrons. These three neutrons further hit the uranium nucleus and the uranium nucleus split into two nuclei and these 3 neutrons produces 9 neutrons.

The reaction for nuclear fission is,

$^(235)_(92)U+^1_0n\rightarrow ^(89)_(36)Kr+^(144)_(56)Ba+3^1_0n$

As, Each nuclear fission reaction produces 3 neutrons

So, three nuclear fission reaction produces 9 neutrons

If each fission reaction in a nuclear reactor emits three neutrons, 9 neutrons are produced from three fission reactions. The correct option is option D.

What is nuclear reactor?

A nuclear reactor comprises a device used to start and regulate nuclear chain reactions involving fission or nuclear fusion. Nuclear power plants employ nuclear reactors to produce energy, and they are also used in nuclear propulsion for ships. Nuclear fission transfers heat into a working fluid (such as water or gas), which then drives steam turbines.

In nuclear reactor, neutron hits the uranium nucleus, the uranium nucleus splits into two nuclei and three neutrons. These three neutrons further hit the uranium nucleus and the uranium nucleus split into two nuclei and these 3 neutrons produces 9 neutrons.

Therefore, the number of neutron is 9. The correct option is option D.

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Imagine placing an ice cube in a bowl of hot soup. Would the heat energy transfer from the ince cube to the soup or from the soup to the ice cube? Explain your answer

Answers

Answer: from the soup to the ice

Explanation: The heat energy from the soup truly transfers to the ice cube when you put it in a bowl of hot soup. An object with a greater temperature will always transfer heat to an object with a lower temperature. In this instance, the hot soup has a higher temperature than the ice cube due to its higher thermal energy content. The ice cube melts as a result of the heat energy moving from the soup to it, and the soup cools as a result.

Which of the following is not a diatomic molecule? nitrogen hydrogen bromine helium

Answers

Answer: Option (d) is the correct answer.

Explanation:

When two atoms are bonded together then it is known as a diatomic molecule.

Such as nitrogen exists as $N_(2)$ molecule in atmosphere so, it is a diatomic molecule.

Hydrogen also exists as $H_(2)$ molecule in atmosphere so, it is also a diatomic molecule. Also, bromine is a diatomic molecule because it exists as $Br_(2)$ molecule into the atmosphere.

But helium exists as He molecule as it has 2 electrons so, as per the octet rule it's s-shell is completely filled. Hence, it is stable and exists as a monoatomic molecule into the atmosphere.

Thus, we can conclude that out of the given options, helium is not a diatomic molecule.

Answer:

HELIUM

That's your answer!!

_____ is a process that helps fuel your metabolism.Deoxidation
Oxidation
Glycolysis
Hydrolysis

Answers

Glycolysis is a process that helps fuel your metabolism. It is apart of cellular respiration the process that helps produce ATP.

Explanation:

Glycolysis is the metabolic process that assists as the grounds for both aerobic and anaerobic cellular respiration. In glycolysis, glucose is transformed into pyruvate. Glucose is a six-membered circle molecule found in the blood and is regularly a result of the breakdown of carbohydrates into sugar.

Glycolysis is the process that helps fuel your metabolism. It generates energy in the form of ATP through the breakdown of glucose.

The metabolic process that helps fuel your body is known as Glycolysis. This is a series of reactions that takes place in the cell's cytoplasm, where glucose (a simple sugar) is broken down into two molecules of pyruvate. This process generates energy which gets stored in the form of ATP (adenosine triphosphate), a molecule that allows the body to perform various functions like muscle contraction, nerve impulse propagation, and chemical synthesis, etc. Hence, glycolysis supports the metabolism by providing necessary energy to the body.

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Water changing from a liquid to a gas is _____.precipitation
evaporation
condensation
transpiration

Answers

Answer : The correct option is, evaporation

Explanation :

Evaporation : It is a type of process in which the phase changes from liquid state to gaseous state at constant temperature.

Condensation : It is a type of process in which the phase changes from gaseous state to liquid state at constant temperature.

Precipitation : It is a type of process in which the solid is formed when the reaction occurs in liquid solution.

Transpiration : It is a process in which the water moves from roots of the plant to the small pores. That means the movement of water through the plant.

When water changing from a liquid to a gas is an evaporation.

Hence, the correct option is, evaporation.

Answer:

The answer is evaporation

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