Do you think these fish are an example of natural selection among two populations of the same species

Answer: 410

Explanation:

Drop the retaining numbers 1 and 2 after the decimal and then round the 2 in 412 to 0 because any number less than 5 rounds to 0. 0 shouldn’t count as a sig fig.

97.17 years will be required until the 90sr is reduced to 1.0 ppm

Calculation :

Radiactive decays are always follow first order kinetics .

\(t_{1/2}\) = 28.8 yr

for first order reaction,

kt = ln([A]0/[A]t)

where k = rate constant

           t = time

       [A]0 =initial concentration

       [A]t  = concentration at time t

And half cycle \(t_{1/2}\) = 0.693/k

28.8 yr = 0.693/k

k = 0.024yr⁻¹

 [A]0 = 10.3 ppm

  [A]t  =  1.0 ppm

 k*t = ln([A]0/[A]t)

t * 0.024 = ln(10.3/1.0)

t= 2.332/0.024

t = 97.17 yr

Half-life in radioactivity, the time interval required for half of the nuclei in a radioactive sample to decay (spontaneously transform into other types of nuclei by releasing particles and energy), or equivalently, the time required for decay times Every second of interval radioactivity ...

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In 2CaCO3 there are 3 elements

I hope that helped you! If you have any further questions comment down below or message me! Good luck!

Deprotonation of phenol by NaOHPhenol is a weak acid with a pKa value of 10, so it is not very acidic but it can be deprotonated with a strong base like sodium hydroxide (NaOH). The mechanism for this reaction is a simple acid-base reaction where NaOH acts as a base and removes the proton (H+) from phenol.

The curved arrow mechanism is shown below:Here, the Na+ ion comes in and removes the H+ ion from the O-H bond in phenol and forms water as a by-product. The major organic product is phenoxide ion (C6H5O−) which is formed after the deprotonation reaction.SN2 reaction of phenoxide with chloroethane Phenoxide ion is a good nucleophile because it has a negative charge on the oxygen atom which is able to attack the positively charged carbon atom in chloroethane. The mechanism for this reaction is a nucleophilic substitution (SN2) reaction where the phenoxide ion acts as a nucleophile and replaces the chloride ion in chloroethane. The curved arrow mechanism is shown below:Here, the phenoxide ion attacks the carbon atom in chloroethane, and the chloride ion leaves as a leaving group. The major organic product is ethyl phenyl ether (C6H5OC2H5) which is formed after the SN2 reaction.

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Answer:

The chemical formula for iron (iii) carbonate is Fe2(CO3)3.

Explanation:

The chemical formula for iron (III) carbonate is Fe2(CO3)3. It represents the chemical composition of the compound and tells us the number and type of atoms present in the molecule. The symbol Fe represents iron, while 2(CO3)3 represents two carbonate ions (CO3) with each having three oxygen atoms. The subscripts indicate the number of each type of atom present in the molecule. So, in this formula, there are two iron ions (Fe) and six carbonate ions (CO3) present in the compound.


ALLEN

The chemical formula for iron (III) carbonate is Fe₂(CO₃)₃. In this formula, the iron (III) ion (Fe³⁺) is combined with the carbonate ion (CO₃²⁻) to form the compound.

A chemical formula is a notation that represents the composition of a chemical compound. It indicates the types and quantities of atoms present in a compound. Chemical formulas are used to express the ratio of atoms or ions in a compound and provide information about its chemical structure.

The general format of a chemical formula consists of element symbols and subscripts. The element symbols represent the specific atoms, while the subscripts indicate the number of atoms or ions of each element in the compound.

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Based on the mole ratio, the number of moles of Al required to produce 35.2 g of AlBr₃ is 0.13 moles.

The mole ratio of the reaction is the ratio in which moles of reactants combine to form moles of product.

The mole ratio is obtained from the equation of the reaction.

Considering the given reaction equation below:

Al(s) + 3 Br₂(l) → 2 AlBr₃(s)

1 mole of Al produces 2 moles of AlBr₃ when reacted with 3 moles of Br₂

Molar mass of AlBr₃ = 267 g

Molar mass of Al = 27 g

Moles of Al required to produce 35.2 g of AlBr₃ = 35.2 * 27/267 * 1 mole/27

Moles of Al required to produce 35.2 g of AlBr₃ = 0.13 moles of Al

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Answer:

Get SNS

Explanation:

Answer:

14.212 x 10^23 atoms

Explanation:

Xenon is a noble gas and is MONOTOMIC so

EACH mole is an Avagadro's Number of atoms

   2.36 * 6.022 x 10^23   atoms =

Answer:

ok

Explanation:

Answer:

Yes it is balanced

Explanation:

You can check by finding the total of each element on both sides so:

Left Hand Side :

Carbons: 6

Oxygens: 6x2 (carbon dioxide) and 6 (water) so there are 18

Hydrogens: 6x2 (carbon dioxide) so 12

Right Hand Side:

Carbons: 6

Oxygens: 6 (glucose) then 6x2 (oxygen) so there are 18

Hydrogens: 12

The compounds ranked by their expected lattice energy from greatest to least are: MgF_2, MgCl_2, MgBr_2, MgI_2.

Lattice energy is a measure of the energy released when gaseous ions come together to form an ionic solid. It is influenced by factors such as ion charge and ion size. In general, as the charges of the ions increase, the lattice energy also increases. However, when comparing ions with the same charge, the size of the ions becomes the determining factor.

In the given compounds, the common ion is Mg_2+ (with a +2 charge), while the anions are F-, Cl-, Br-, and I-. Among these anions, fluoride (F-) has the smallest ionic radius, followed by chloride (Cl-), bromide (Br-), and iodide (I-). Smaller ions have a higher charge density, meaning the positive charge is concentrated in a smaller space, leading to stronger attractive forces between the ions.

Therefore, based on ion size, the compound with the greatest expected lattice energy is MgF_2, followed by MgCl_2, MgBr_2, and MgI_2, with MgF_2 having the strongest bond and MgI_2 having the weakest bond.

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Answer:

See below.

Explanation:

When hydrogen burns, it would release energy. Not absorb energy!

Answer:

Fossil fuels, such as coal, oil, or natural gas, release carbon back into the atmosphere.

The processes would be decomposition, diffusion, erosion, respiration, and combustion.

Explanation:

Hope this helped?

Answer:

298.99 , = 738.39

Explanation:

hope it help you

to gain the answer

Answer: D

Explanation:

the atom of the metal loses one electron which becomes delocalised and is attragted by the positive nucleus leading to formation of metallic bond.

E. They form because electrons can move freely between atoms

Top guy is incorrect↑

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Energy-requiring reactions can occur in biological systems because they can be coupled with reactions that are exergonic reaction.

In chemical thermodynamics, an exergonic reaction is a chemical reaction where the conversion in the free energy is negative (there is a net allow to leave of free energy). This shows a unbidden reaction if the structure is closed and starting and final temperatures are the similar.

Formula of exergonic reaction :

∆G = Gproducts - Greactants

where

∆G = change in free energy

G-products = free energy of products

G-reactants = free energy of reactants

Now, it can understood that "Energy - requiring reactions can occur in biological systems because they can be coupled with reactions that are exergonic reactions."

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Answer:

27966692

Explanation:

I don't know if this is right or not

Answer:

here are several resons that fossil foraminifera are especially valuable for determining the relative ages of marine rock layers. They have been around since the Cambrian, over 500 million years ago. They show fairly continuous evolutionary development, so different species are found at different times.

Answer:

1st one

Explanation:

Answer:

DNA

Explanation:

The eukaryotic cell participates in the formation of complex organisms and contains a nucleus, cytoplasmic organelles, and a cytoskeleton.

The answer should be DNA based on the wording of the question. Hopefully this helped a little bit.

The following is the strongest reducing agent: Na(s). The correct option is d.

In a redox reaction, a reducing agent is a species that donates electrons and gets oxidized itself. The strength of a reducing agent is determined by its tendency to lose electrons.

Among the options provided, the reducing agents are the metallic forms of calcium (Ca(s)), sodium (Na(s)), and potassium (K(s)), as well as the aqueous cations of calcium (Ca2+(aq)) and lithium (Li+(aq)).

Since sodium (Na) is more reactive than calcium (Ca) and potassium (K) in the alkali metal group, it has a stronger tendency to lose electrons. Therefore, Na(s) is the strongest reducing agent among the options given.

The aqueous cations, Ca2+(aq) and Li+(aq), are not considered as strong reducing agents compared to their metallic forms, Ca(s) and Li(s), respectively. The correct option is d.

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Out of the answer choices, rubidium has the highest energy valence shell. With a single electron in the fifth energy level, krypton will have the highest number of energy levels of the group I elements listed.

kasama na po jan ang explenation

Answer:

2. waves

3. True

4. the distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.

5. Frequency is the number of occurrences of a repeating event per unit of time.

6. slow, fast

7. left to right

8. The maximum displacement or distance moved by a point on a vibrating body

9. No

10. radio waves, and microwave.

11. tv uses electromagentic waves while light uses electromagenti radition.

Explanation:

You can estimate the value of 22 % of 78 by finding 10 % of 78 and then adding another 10% to reach as close to 22 % as possible.

Start by finding 10% of 78. Divide 78 by 10 to get 7.8. Since you want to estimate 22%, you can take the calculated value of 10% (7.8) and multiply it by 2 to get 15.6.

Next, compare the estimated value of 15.6 with the actual value of 22% of 78. Calculate the actual value by multiplying 78 by 0.22 (since 22% is equivalent to 0.22). The result is 17.16.

Compare the estimated value of 15.6 with the actual value of 17.16.

By comparing the estimated value of 15.6 with the actual value of 17.16, you can assess the reasonability of your estimate.

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Answer:19

Explanation:

The estimated relative contribution of C3 plants is approximately 88%, while the estimated relative contribution of C4 plants is approximately 12% to the organic matter in Kenya's soil.

To determine the relative contribution of C3 and C4 plants to the organic matter in Kenya's soil, we can use the difference in stable carbon isotopic compositions (δ13C values) between these plant types.

C3 and C4 plants have distinct δ13C values due to differences in their carbon fixation pathways. C3 plants generally have δ13C values ranging from -22 to -33 permil, while C4 plants typically exhibit δ13C values from -9 to -16 permil.

Given that the stable carbon isotopic composition (δ13C) of the soil organic matter in Kenya is -18 permil, we can compare this value to the δ13C values of C3 and C4 plants to estimate their relative contributions.

Let's denote the relative contribution of C3 plants as "x" and the relative contribution of C4 plants as "y." Since the contributions of C3 and C4 plants sum up to 100%, we have the equation:

x + y = 100% (equation 1)

Now, let's assign the δ13C values to the contributions of C3 and C4 plants. Assuming the air δ13C value is -7 permil, we can write the following equations:

-18 = x * (-33) + y * (-16) + (-7) * (1 - x - y) (equation 2)

Solving equations 1 and 2 simultaneously will provide us with the relative contributions of C3 and C4 plants.

Using the given δ13C values and solving the equations, we find:

x ≈ 0.88 (or 88%)

y ≈ 0.12 (or 12%)

Therefore, the estimated relative contribution of C3 plants is approximately 88%, while the estimated relative contribution of C4 plants is approximately 12% to the organic matter in Kenya's soil.

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Answer:

The area of a star's atmosphere between its photosphere and corona, such as that of the sun, is referred to as its chromospheric region

There is no heat exchange with the environment since the calorimeter is insulated. This may be demonstrated by saying: Since the calorimeter is a fixed unit, it follows that its heat capacity likewise has a fixed value.

Calorimeters are the tools used to measure the amount of heat. The definitions of heat and temperature, the quantity of heat absorbed to raise a body's temperature, the distinction between heat and temperature, and specific heat capacity are among the fundamental ideas presented in this chapter. A chemical reaction's associated thermal energy change is what causes a calorimeter's temperature to fluctuate. If the calorimeter absorbs heat (q calorimeter > 0) and its temperature rises, the reaction is producing heat (q rxn 0).

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Answer:

Chemical change

Explanation:

Rust cannot be done without using chemicals.

Answer:

Option B.) Chemical Change