Here are the other two options ​

Answer:

The approximate age of the igneous rock is [tex]7.042\times 10^{6}[/tex] years.

Explanation:

Chemically speaking, the Uranium-235 decays to form Lead-207 throughout time. All isotopes decay exponentially by means of the following model:

[tex]m(t) = m_{o}\cdot e^{-\frac{t}{\tau} }[/tex] (1)

In addition, we can determine the time constant of the former isotope in terms of its half life, that is:

[tex]\tau = \frac{t_{1/2}}{\ln 2}[/tex] (2)

Where:

[tex]m_{o}[/tex] - Initial mass of Uranium-235, in atoms.

[tex]m(t)[/tex] - Current mass of Uranium-235, in atoms.

[tex]\tau[/tex] - TIme constant, in years.

[tex]t_{1/2}[/tex] - Half-life of Uranium-235, in years.

Please remind that a 1 : 1 ratio of Uranium-235 to Lead-207 atoms means that current mass of Uranium-235 is a half of its initial mass. If we know that [tex]m(t) = 0.5\cdot m_{o}[/tex] and [tex]t_{1/2} = 7.04\times 10^{8}\,yr[/tex], then the approximate age of the igneous rock is:

[tex]\tau = \frac{7.04\times 10^{8}\,yr}{\ln 2}[/tex]

[tex]\tau \approx 1.016\times 10^{9}\,yr[/tex]

[tex]t = -\tau \cdot \ln \left(\frac{m(t)}{m_{o}} \right)[/tex]

[tex]t = -(1.016\times 10^{9}\,yr)\cdot \ln \frac{1}{2}[/tex]

[tex]t \approx 7.042\times 10^{6}\,yr[/tex]

The approximate age of the igneous rock is [tex]7.042\times 10^{6}[/tex] years.

Answer:

It is a Cline or layer where density gradient is greatest within a body of water

Answer:

5.5 atm

Explanation:

Step 1: Calculate the moles in 2.0 L of oxygen at STP

At STP, 1 mole of an ideal gas occupies 22.4 L.

2.0 L × 1 mol/22.4 L = 0.089 mol

Step 2: Calculate the moles in 8.0 L of nitrogen at STP

At STP, 1 mole of an ideal gas occupies 22.4 L.

8.0 L × 1 mol/22.4 L = 0.36 mol

Step 3: Calculate the total number of moles of the mixture

n = 0.089 mol + 0.36 mol = 0.45 mol

Step 4: Calculate the pressure exerted by the mixture

We will use the ideal gas equation.

P × V = n × R × T

P = n × R × T / V

P = 0.45 mol × (0.0821 atm.L/mol.K) × 298 K / 2.0 L = 5.5 atm

Answer:

because it has one cotyledon and it has parallel venation also maize is grain..

Answer:

One of the most important uses for fingerprints is to help investigators link one crime scene to another involving the same person. Fingerprint identification also helps investigators to track a criminal's record, their previous arrests and convictions, to aid in sentencing, probation, parole and pardoning decisions.

Explanation:

Answer: The given elements are arranged in order of increasing ionization energy as Pb < Sn < Ge < Si < C.

Explanation:

The amount of energy required to remove a loosely bound electron from an isolated neutral gaseous atom is called ionization energy.

Larger is the size of an atom more easily it will lose its valence electrons. Hence, less will its ionization energy.

Whereas smaller is the size of an atom more energy will be required to pull out the electron. Hence, more will be its ionization energy.

This means that on moving down a group ionization energy decreases and on moving along a period from left to right the ionization energy decreases.

The given elements are C, Ge, Pb, Si, and Sn. All these elements belong to group 14 of the periodic table.

Therefore, these elements are arranged in order of increasing ionization energy as follows.

Pb < Sn < Ge < Si < C

Thus, we can conclude that given elements are arranged in order of increasing ionization energy as Pb < Sn < Ge < Si < C.

Answer:

a

Explanation:

because you need to add 2 to to hf to make it equal to h2

No hablo espanol could you put it in English?

Explanation:

Regeneration is a type of asexual reproduction in which the organism is capable of regrowing certain body parts.

Answer: Regeneration is defined as organism's ability to regrow damaged or lost body parts. It is a type of asexual reproduction which is shown by many fully differentiated organisms. Organism such as Hydra uses regenerative cells for reproduction in the process of budding. The young Hydra gets its nourishment from the parent.

Explanation:

Answer:

4 joules

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Cya on the next one!

Explanation:

4 joules.

When it left the table it would have mgh potential energy that would have been converted to kinetic when it hit the floor. If the mass (m) was twice the energy would have been twice.

Answer:

a. Hexanal

Reagent: - Hot acidified potassium permanganate solution.

or : Ammoniacal silver nitrate solution

or : Fehling's solution.

or : Hot acidified potassium dichromate ( VI ) solution.

Some organic compounds can be oxidised to carboxylic acid using suitable oxidising agents. Alkanes can be converted to acid or acid salt by carboxylation reaction and alkyl halides can be converted using Grignard reagent and then hydrolysis.

Carboxylic acids are organic acids containing the functional group COOH. It can be prepared through oxidation  of various of organic compounds.

Hexanal can be converted to hexanoic acid using carboxylation that is reaction with carbon dioxide.

Methyl hexanoate is an ester which can be converted to hexanoic acid by hydrolysis. Reaction with water introduces the H+ group into the ester group COOMe.

1 bromopentane can be converted into hexanoic acid using grignard reagent RMg followed by hydrolysis.

Alcohols can be easily oxidised to acids. Thus, 1-hexanol can be oxidised to hexanoic acid using oxidising agents such as potassium permanganate.

Nitriles can be oxidised to corresponding carboxylic acid using oxidising agents such as chromium chloride or grignard reagent.

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Answer:

Molefraction is the ratio of the number of moles of solute and total number of moles in solution. Moles = (given mass) / (molar mass) = 1000/18 = 55.5 moles. Therefore 1/(55.5+1) = 0.017. Molefraction of solute in 1 m aqueous solution is 0.017.

Explanation:

Answer:

C.A scientific approach to answering questions

Explanation:

Answer:

magnesium  

Explanation:

because zinc does not react with water because it too forms a protective layer of insoluble.

Answer:

If it started with Plato or a little later, the job for Greek Astronomers employed as the platonic tradition was, correctly or incorrectly, to save appearances: obviously to describe, in a mixture of uniform circular motions, irregular motion observed by senses.

Explanation:

Answer:

temperature and solubility

Explanation:

In the experiment where we are testing the solubility of sugar at different temperatures and pressure, the dependant variable is the solubility and the independent variables are the temperature, pressure and sugar concentration.

Independent variables in an experiment is the variables which does not depends on any other variables and on which we can have access or control.

Dependant variables are dependant on the independent variables and they change with respect to the change in independent variables.  On dependant variables are those which we are studying and can  have no direct control over it,

In the solubility measurement, solubility is the dependant variable and the we are measuring it under different conditions that are the independent variables such as temperature, pressure, sugar concentration etc.

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Answer:

Alkene

Explanation:

Took the test.

The correct answer is Option (A) Alkene.

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Answer:

H₂O = 3.56 moles

MgCl₂ = 1.78 moles

Explanation:

Answer:

The type of force is known as cohesive force

Answer:

O High pressure/Low pressure

Explanation:

A low pressure system has lower pressure at its center than the areas around it. Winds blow towards the low pressure, and the air rises in the atmosphere where they meet. ... A high pressure system has higher pressure at its center than the areas around it. Winds blow away from high pressure.

The two types of pressure commonly referred to are high pressure and low pressure. Therefore option 3 is correct.

High pressure/Low pressure: This option correctly identifies the two main types of pressure. High pressure refers to conditions where the pressure is greater than atmospheric pressure, such as in compressed gases or in high-pressure systems.

Low pressure refers to conditions where the pressure is less than atmospheric pressure, such as in a vacuum or in areas of low atmospheric pressure, like the center of a weather system.

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Answer:

D). Taxonomy.

Explanation:

'Taxonomy' is described as the process or the science of finding, describing, classifying, and naming different organisms. It is characterized as the technique of classification of animals, micro-organisms, plants, etc. into different categories or hierarchies. It has primarily been divided into eight distinct types like kingdom, species, order, family, etc.  

Astronomy is associated with the study of the physical universe while the economy is defined as the study of efficient utilization of resources and identification is the process of recognizing an object. Thus, option D is the correct answer.

Answer:

ionic bonds are the weakest bonds

Explanation:

Answer:

Purify drinking water of unwanted

Hope this helps! :D

Answer:

the earth would be covered in ice and we would not be able to survive as there is not natural insulation

A: ionic bond,   you know why becasue it is

Answer:

water

Explanation: