Which reaction takes place in a nuclear fission reactor?
OCH N
→
239
O Pu+ He 242 Cm
94
96
O 27 Co+He→Co+n
139
O 235 U+n Kr+¹Ba+3/n
56
92

Toxicology is the branch which studies about toxic chemicals and their effects.

Toxicology is the branch in science in which the researches and study are done for finding the effect of the toxic  or poisonous elements on plants , animals , human and earth at large.

High levels of lead exposure is dangerous to humans as it can cause permanent disabilities , it is carcinogenic and hence can lead to death.

This is studied in toxicology.

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Answer:

D.) Speciation

Explanation:

A.) is incorrect because favorable traits becoming more widespread within a population usually means that the population is becoming better suited for its environment. Therefore, unless there are external factors, starvation is not a direct result of positive adaptations.

B.) is incorrect because the population is gaining adaptations that make their survival within an environment more likely, not less likely. Again, extinction is the opposite of what occurs when this happens.

C.) is incorrect because migration typically occurs when a population is experiencing hardships within their environment. This is what causes them to move somewhere else in order to increase their survival/reproductive success. As stated previously, favorable adaptations would make the population better suited for their current environment. These changes would discourage migration.

D.) is correct because speciation occurs when a population changes so much over generations to the point in which they become another species entirely. If a population undergoes numerous positive adaptations, they will become more and more fit for their environment. This newfound fitness and these changes may be so drastic that the population becomes too different to classify them the same way they once were.

Answer:

D. speciation

Explanation:

took the test

A phenotypic characteristic and/or trait of the cats that exhibit variation is the fur color.

Phenotypic variation is any type of distinguishable value for a trait that depends on genetic and/or environmental factors.

Cats exhibit different fur colors depending on specific gene variants (alleles) that are inherited from their parents.

In conclusion, a phenotypic characteristic or trait of the cats that show a variation is the fur color.

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Gay-Lussac's law: [tex]\frac{V1}{T1}[/tex]=[tex]\frac{V2}{T2}[/tex]

We need to convert temperature from Celsius to Kelvin

-55 C = 218 K

30 C = 303 K

V2 = V1*T2 / T1 = 0.550 *303 / 218 = 0.764 l

The unknown solid is removed by rinsing with water while the PDB is removed by rinsing with alcohol.

Solvents are substances which dissolve other substances to form solutions or mixtures.

Water is used as a solvent for inorganic substances while organic solvents such as alcohol or kerosene are used as solvents for organic substances such as PDB.

Alcohol is added to the test tube containing PDB, which then dissolves. The tube is rinsed with more alcohol until all the PDB dissolves.

Therefore, the unknown solid is removed by rinsing with water while the PDB is removed by rinsing with alcohol.

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Americium is a radioactive element .

The nuclear reaction.is given by

[tex]\rm {}^{241}_{95}Am\longrightarrow {}^{237}_{93}Np+{}^4_2\alpha[/tex]

Here alpha can be written as He too

The energy of the photon from the calculation performed is 3.5 * 10^-16 J.

A photon is a packet of light. It was derived from the theory of Albert Einstein. The energy of a photon is obtained from; E = hc/λ

Now we have that;

E = 6.6 * 10^-34 * 3 * 10^8/562 * 10^-9

E = 3.5 * 10^-16 J

Missing parts:

Calculate the energy, in joules, of a photon of green light having a wavelength of 562nm?

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Answer:

Hydrogen Gas is the free element

Answer: 0.37 M

Explanation:

[tex]M_{A}V_{A}=M_{B}V_{B}\\(20.4)(0.650)=M_{B}(36)\\M_{B}=\frac{(20.4)(0.650)}{36}=\boxed{0.37 \text{ M}}[/tex]

Answer:

the molecules move more quickly and their average kinetic energy decreases :D

Explanation:

Answer:

6

Explanation:

The atomic number for phosphorous is 15, meaning that it has 15 electrons (and protons). The first and second shells would be filled up with 2 and 8 electrons respectively, leaving 5 which goes on the third shell, which is also the valence shell, meaning phosphorous has 5 valence electrons.

Since the atomic number of sulfur is 16, the first and second shells are also filled up with 2 and 8 electrons respectively, leaving 6 to be on the third shell, the valence shell. Hence, sulfur has 6 valence electrons.

The chemical equation for the reaction between carbon oxide and nitrogen oxide is shown below:

[tex]CO + NO \rightarrow CO_2 + N_2[/tex]

A chemical equation is an equation which uses the symbols of elements and compounds to represent the reactions which occur between elements or compounds to form products.

The chemical symbol for carbon is C, nitrogen is N, and oxygen is O.

The equation representing the reaction between carbon oxide and nitrogen oxide is shown below:

[tex]CO + NO \rightarrow CO_2 + N_2[/tex]

Therefore, the chemical equation for the reaction between carbon oxide and nitrogen oxide represents the reaction to form carbon dioxide and nitrogen gas.

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The molar mass of the gas with the given mass and volume at the given temperature and pressure is 16.00g/mol.

From the Ideal gas law or general gas equation;

PV = nRT

Where P is pressure, V is volume, n is the amount of substance, T is temperature and R is the ideal gas constant ( 0.08206 Latm/molK )

Given that;

First, we determine the amount of gas;

PV = nRT

n = PV / RT

n = ( 0.98026atm × 3.97L ) / ( 0.08206 Latm/molK × 294.15K )

n = 3.8916Latm / (24.137949Latm/mol)

n = 0.1612mol

Molar Mass = Mass of the gas / Amount of the gas

Molar Mass = m / n

Molar Mass = 2.58g / 0.1612mol

Molar Mass = 16.00g/mol

Therefore, the molar mass of the gas with the given mass and volume at the given temperature and pressure is 16.00g/mol.

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Answer:

Explanation:

i. SO2

ii. Na2O

Answer:

5.06 half lives

Explanation:

1/2 ^n  = .03             (.03 is 3% in decimal)

                         log both sides

n log 1/2 = log .03

n = 5.06  half lives

[tex]O^{2-}[/tex] is the Lewis base in the following reaction:

[tex]SO_3(g) + O^{2-}(aq)[/tex]   →  [tex]SO_4^{2-}(aq)[/tex]

Lewis base is a species that donates an electron pair.

In the above-given chemical equation, the [tex]O^{2-}[/tex]is the lewis base which is donating an electron pair to the central atom of [tex]SO_3[/tex] to form [tex]SO_4^{-2}[/tex].

Hence, [tex]O^{2-}[/tex] is the Lewis base in the following reaction:

[tex]SO_3(g) + O^{2-}(aq)[/tex]   →  [tex]SO_4^{2-}(aq)[/tex]

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The titration would require the same amount of NaOH.

The number of moles of solute in a solution remains the same irrespective of the amount of water added to dilute the solution.

This is in accordance with the dilution law which says that the number of moles of a solution before dilution is the same as after dilution.

Thus, the amount of NaOH needed to neutralize the vinegar will remain the same for a complete reaction since the number of moles of solute in the vinegar has not changed.

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Answer: 558.5545 g

Explanation:

The formula for a sulphate ion is [tex]\text{SO}_{4}^{\text{ }2-}[/tex], so the formula for copper sulphate is [tex]\text{CuSO}_{4}[/tex].

This means the formula mass of copper sulphate is:

So, in 3.5 moles, the mass is (159.587)(3.5)=558.5545 g

In general, the formation of a chemical bond lowers the potential energy of a chemical system, leading to a more stable arrangement.

Stored energy depends upon the relative position of various parts of a system.

In bond formation, atoms lose their potential energy to attain stability and heat is evolved. The bond formation is an exothermic reaction.

Atoms bond together to form compounds to attain lower energies than they possess as individual atoms.

A quantity of energy is equal to the difference between the energies of the bonded atoms and the energies of the broken atoms.

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The purpose of cracking in the production of ethene is to convert large molecules into small molecules.

Ethene can be produced from the thermal cracking of ethane and propene.

In thermal cracking, high temperature of about 750-850°C and pressure of up to about 70 atm is used to break carbon-carbon bonds. Free radicals are formed in the process.

More about petroleum refining processes:

Petroleum refinery can be classified into two broad categories, namely the main refining processes and conversion processes. Main refining processes includes distillation, absorption and adsorption, while conversion processes involves thermal cracking, catalytic cracking and hydrocracking.

As the name implies, cracking is generally the breaking up of larger molecules into smaller, more useful molecules, such as those with 5 to 12 carbons.

To better comprehend cracking processes, we can use the analogy of dropping a ceramic mug.

When this ceramic mug is dropped, it breaks into smaller ceramic pieces. This represents smaller molecules being formed from a larger molecule. The force used to break them into smaller molecules would differ in the various types of cracking processes. For example, thermal cracking mainly uses heat while catalytic cracking mainly uses a zeolite catalyst.

Note that for these cracking processes to occur, there are other conditions involved.

Additional:

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Answer:

I think yes

Explanation:

sorry i havent done these type a questions in a while

The equilibrium constant of the reaction is represented by the symbol K. Thus, option C is the correct and accurate statement about the equilibrium constant.

The equilibrium constant is a representation of the concentration of the products and the reactants of the reaction that is raised to the powers through their stoichiometry coefficient.

Its value varies and changes at different temperatures and is not always less than 1. The equilibrium constant is the ratio of the coefficient of the products to reactants.

Therefore, option C. equilibrium constant is represented by K is true.

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The number of moles of nitrogen gas in each tire would be 1.595 moles

The ideal gas law is represented by the equation:

PV = nRT where P = pressure, V = volume, n = number of moles of gas, R = constant, and T = temperature.

In this case, P = 249 kpa, V = 15.6 L, R = 8.31, and T = 293 K (273 + 20).

n = PV/RT = 249 x 15.6/8.31 x 293 = 1.595 moles

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it is chemical change because chemical change occur when bonds are broken or formed between molecules or atoms.

Answer: a branch of chemistry concerned with the rate of chemical reactions, the factors that influence these rates, and the use of rate studies to clarify reaction mechanisms

Explanation:

pH= –log¹⁰[H+]

0.50= –log¹⁰[H+]

log¹⁰[H+]=0.50

take the antilog of 0.50

[H+]= 3.16moldm-³

Answer:

A thermochemical equation for the combustion of propane (C3H8)(C3H8) is written as follows:

C3H8(l)+5O2(g)→3CO2(g)+4H2O(g);ΔH∘rxnC3H8(l)+5O2(g)→3CO2(g)+4H2O(g);ΔHrxn∘ = -2202.0 kJ/mol

The value given for ΔH∘rxnΔHrxn∘ means that:

a. the reaction of one mole of propane absorbs 2202 kJ of energy from the surroundings.

b. the reaction is endothermic.

c. the enthalpy of formation of propane is 2202 kJ/mol.

d. the reaction of one mole of propane releases 2202 kJ of energy to the surroundings.

e. None of these.

Answer:

65 ml

Explanation:

The aluminum will not float , so it will displace a volume of fluid equal to its volume.

 13.5 gm / 2.7 gm/ml = 5 ml

the new graduated cylinder measurement will be 60 + 5 = 65 ml