please answer ................

Answer:

option c is correct answer.

during alpha decay mass of daughter atom is 4 unit less than its parent atom and its atomic number is 2 unit less than its parent atom.

[tex]\sf so , \: ^4 _2 He \: atom \: is \: released .[/tex]

Therefore, option c is answer.

Energy transformations are the processes by which one form of energy is converted to another form.

Energy transformations refers to the various ways in which different forms of energy are interconverted.

The given energy transformations are as follows:

Therefore, energy transformations are the processes by which one form of energy is converted to another form.

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Deforestation increases the level of carbon dioxide in the atmosphere by decreasing the rate of photosynthesis (i.e., by removing trees).

Deforestation refers to the removal of trees in a given ecosystem (e.g. a particular forest biome).

Thus practice (deforestation) is well known to increase the levels of carbon dioxide and global warming.

In conclusion, deforestation increases the level of carbon dioxide in the atmosphere by decreasing the rate of photosynthesis (i.e., by removing trees).

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15.75 moles of oxygen is required for 4.5 mole of ethane.

The reaction in which a fuel  gets oxidized by an oxidizing agent is called a Combustion Reaction , releasing a large amount of energy is called Combustion Reaction.

It is given in the question that

4.50 mole of ethane undergoes Combustion

2C₂H₆   +  7O₂   ->  4CO₂  +6H₂O

Mole fraction of ethane to oxygen is 2:7

Moles of ethane = 4.5

4.5 /x = 2/7

4.5 * 7 / 2 = x

x = 15.75 moles.

Therefore 15.75 moles of oxygen is required for 4.5 mole of ethane.

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Answer:

A.) You have been given grams of NaCl (11.0 g) and the volume of the solution (100 mL).

B.) You need to determine the moles of NaCl and the volume of the solution in liters. To find the moles of NaCl , you need to know the molar mass of NaCl.

C.) 1.88 M

Explanation:

To find the molarity of the solution, you need to (1) convert mL to L (by dividing by 1,000), then (2) convert moles NaCl to grams (via molar mass from periodic table), then (3) plug the values into the molarity equation.

Volume = 100 mL / 1,000 = 0.100 L

Molar Mass (NaCl) = 22.99 g/mol + 35.45 g/mol

Molar Mass (NaCl) = 58.44 g/mol

11.0 g NaCl          1 mole
-----------------  x  ---------------  = 0.188 moles NaCl

                           58.44 g

Molarity = moles / volume

Molarity = 0.188 moles / 0.100 L

Molarity = 1.88 M

Answer:

(D) It is very expensive to develop.

Explanation:

There are currently no active fusion reactors because of not only the cost of development but more importantly the difficulty.

It is very expensive to develop. Hence, option C is correct.

Nuclear fusion involves the fusion of 2 smaller nuclei into bigger nuclei. Nuclear fission on the other hand involves the fission/splitting of a large radioactive nucleus into smaller nuclei which are comparatively stable.

A negative aspect of nuclear fusion is that there are currently no active fusion reactors because of not only the cost of development but more importantly the difficulty.

Hence, option C is correct.

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Answer:

The highest biogenic silica accumulation rates in this area are observed in the South Atlantic, with values as large as 53 cm. kyr−1 during the last 18,000 yr. Further, extensive biogenic silica accumulation has been recorded in the deep-sea sediments of the Bering Sea, Sea of Okhotsk, and Subarctic North Pacific.

Explanation:

Answer:

How Hot Or cold it is is how it may be perceived

Answer:

Water molecules' adhesion aids plants in moisture absorption at their roots. Water's initial boiling point is attributed to cohesion, which helps animals regulate their body temperature.

Explanation:

Answer:

During the completion of mitosis (telophase), two new nuclei form around the separated sets of daughter chromosomes (see Figure 8.29).

Explanation:

The balanced redox reaction, if it occurs in acidic solution, is

5C₂O₄²⁻(aq) + 2MnO₄⁻(aq) + 16H⁺-----> 10CO₂(g) + 2Mn²⁺(aq) + 8H₂O(l)

Redox reactions are those in which loss and again of electrons occur.

To balance the redox reaction, we must first break the whole reaction into half equations;

Oxidation half equation

[tex]\rm 5C_2O4^2^-(aq) + 10e + 8H^+----- > 10CO_2(g) + 4H_2O(l)[/tex]

Reduction half equation

[tex]\rm 2MnO_4^- (aq) + 10e + 8H^+----- > 2Mn^2+(aq) + 4H_2O(l)[/tex]

Now combine both the reactions

[tex]\rm 5C_2O_4^2-(aq) + 2MnO4^- (aq) + 16H^+----- > 10CO_2(g) + 2Mn^2+(aq) + 8H_2O(l)[/tex]

Thus, the coefficient of H₂C₂O₄ is 5 and that of water is 8.

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The Balanced Reaction is  2N₂O₃⁻  ----->   2 N₂ + 3 0₂

A reaction in which the number of atoms of each element in the reactant and the product are equal is called a Balanced Reaction .

It is given in the question:

To Balance the chemical equation.

N₂O₃⁻  ----->    N₂ + 0₂

To balance the reaction , the number of molecules of each element , i.e. Nitrogen (N) and Oxygen (O) needs to be balanced

2N₂O₃⁻  ----->   2 N₂ + 3 0₂

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The answers to the given questions are given below.

A reaction done with Ozone to determine the position of C-C double bond in unsaturated Hydrocarbons.

It is given in the question

An alkene X undergoes ozonolysis and gives two compounds Y and Z of molecular formula CHO

Y and Z. are functional isomers of each other

[tex]\rm \\(CH_3)_2 -C= CH-CH_2-CH_3 + Zn - > CH_3 -CO-CH_3 + CH0-CH_2-CH_3\\\\Y \;is \;CH_3 -CO-CH_3 \\\\and \;Z \;is \;CHO-CH_2-CH_3[/tex]

                         [tex]\rm Y \;is \;CH_3 -CO-CH_3 \\\\and \;Z \;is \;CHO-CH_2-CH_3[/tex]

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Selena can change from burning fossil fuel in her home to using solar energy.

Climate change is caused by the release of the greenhouse gases which is gotten through the use and burning of fossil fuels such as coal.

The use of solar panels and solar energy by Selena in her house can help adjust the climate changes by decreasing the amount of greenhouse gases released into the atmosphere.

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Answer: The answer is true.

Explanation: Avogadro's number is a mole, which concludes that this statement is true.

(a) The speed of light in the unknown substance is determined 1.82 x 10⁸ m/s.

(b) The light will bend away from the normal since speed of light in air is not equal to speed of light in the substance.

The speed of light passing from air into the substance is calculated as follows;

refractive index = speed of light in air / speed of light in the substance

speed of light in the substance = speed of light in air/refractive index

speed of light in the substance = (3 x 10⁸) / (1.65)

speed of light in the substance = 1.82 x 10⁸ m/s

Thus, the light will bend away from the normal since speed of light in air is not equal to speed of light in the substance.

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The electronic configuration of zinc is expressed as [tex]1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2[/tex]. Hence, option D is correct.

Electronic configuration, also called electronic structure, is the arrangement of electrons in energy levels around an atomic nucleus.

The atomic number of zinc is 30 therefore The electronic configuration of zinc is expressed as [tex]1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2[/tex].

In simpler form expressed as [Ar] [tex]3d^10 4s^2[/tex]. The electronic configuration shows the distribution of the electrons of an atom or a molecule.

Hence, option D is correct.

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(I didn't have this as a question on any of my quizzes, but I will try my best. I wish you luck!)

Answer: Proteins

This is a peptide bond, which is a bond that forms between two amino acids through a condensation reaction. Amino acids make proteins.

82.09% is the percent yield if 399 g is produced. Hence, option  C is correct.

Percent yield is the percent ratio of actual yield to the theoretical yield.

Given data:

Actual yield = 399 g

Theoretical yield = 486 g

%Yield = [tex]\frac{Actual \;Yield \;X \;100 }{Theoretical \;Yield}[/tex]

%Yield = [tex]\frac{399 gX \;100 }{486 g \;Yield}[/tex]

= 82.09%

82.09% is the percent yield if 399 g is produced.

Hence, option  C is correct.

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In order to dissolve a chemical sample in a recrystallization solvent, add the room-temperature solvent just until it covers the sample in an Erlenmeyer flask on a hot plate.

Recrystallization involves dissolving the material to be purified (the solute) in an appropriate hot solvent.

Recrystallization, also known as fractional crystallization, is a procedure for purifying an impure compound in a solvent.

The method of purification is based on the principle that the solubility of most solids increases with increased temperature. Small crystals may trap impurities.

Thus, in order to dissolve a chemical sample in a recrystallization solvent, add the room-temperature solvent just until it covers the sample in an Erlenmeyer flask on a hot plate. Turn on the heat, starting at a low setting and increasing gradually.

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Explanation:

Ammonium hydroxide is considered a weak base because it produces few hydroxide ions in aqueous solution. (Option a)

Let's consider the ionization of ammonium hydroxide, which is a weak base.

NH₄OH ⇄ NH₄⁺ + OH⁻

Why is it considered a weak base?

a. it produces few hydroxide ions in aqueous solution. Yes, since it dissociates partially.

b. it produces few hydrogen ions in aqueous solution. No, since it does not produce hydrogen ions.

c. it does not conduct electricity in aqueous solution. No, since it conducts electricity, although poorly.

d. it will not take part in a neutralization reaction. No, since it will be neutralized by acids.

Ammonium hydroxide is considered a weak base because it produces few hydroxide ions in aqueous solution.

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Answer:

The periodic table

Explanation:

As you can see in the screenshot. Each element on the periodic table has an atomic number and a mass number. The atomic numbers are arranged in numerical order from right to left in the periodic table. The second number there is the atomic mass.

When doing stoichiometric ratios, you need to use the atomic mass of each element to determine the molecular/molar mass.

example. Find the molar mass of

H₂SO₄

Hydrogen (2) + sulphur (1) +oxygen (4)

= atomic mass of H(2)+ atomic mass S(1)+ atomic mass oxygen(4)

=1(2) + 32(1)+16(4)

=2+32+64

=98

N.B We do not use the co-efficient when looking for molar mass, we only use the atom and subscript

⇒Answer:

acid + alkali → salt + water

⇒Explanation:

The acid and alkali neutralize each other to create salt and water. Different acids produce different salts.

Sulphuric acid creates Sulphate salts.

Nitric acid creates Nitrate salts.

Hydrochloric acid creates Chloride salts.

The missing word in this word equation is salt ie, acid + alkali → Salt+ water. It is a Neutralization Reaction.

A neutralization reaction can be defined as a chemical reaction in which an acid and base quantitatively react together to form a salt and water as products.

In a neutralization reaction, there is a combination of H⁺ ions and OH⁻ ions which form water.

Therefore, The missing word in this word equation is salt ie, acid + alkali → Salt+ water. It is a Neutralization Reaction.

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The wave which is created by causing vibrations in particles of matter is a mechanical wave.

A wave is a disturbance in a medium which transmits transmits energy from one point to another without a permanent displacement of the particles of the medium.

Types of waves include:

Mechanical waves are waves which are produced as a result of the vibrations of the particles of the medium.

Therefore, the wave which is created by causing vibrations in particles of matter is a mechanical wave.

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multiplying terrorist to power 23, divided by 96. Multiplied by 12.7. so this is 76.48

7.96 x 10²² particles would be found in a 12.7g sample of ammonium carbonate. A particle is a tiny, localized item.

A particle is a tiny, localized item that may be defined by a number of physical or chemical characteristics, including volume, density, and mass. They range significantly in size or number from tiny particles like atoms to subatomic particles such as the electron.

Depending upon their density, particles can potentially be utilized to mimic even bigger things, such as moving celestial bodies or a throng of people. Although the meaning of the word particle is quite broad, different scientific disciplines might refine it as necessary. Any substance made up of particles is referred to as a particulate.

number of moles = given mass/ molar mass

                            = 12.7/  96.08

                            = 0.13moles

number of particle=  0.13 ×   6.022×10²³  

                              = 7.96 x 10²²    

Therefore, 7.96 x 10²² particles would be found in a 12.7g sample of ammonium carbonate.

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