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An organism is considered extinct if the fossil evidence reveals the remains of one that is no longer present-day. As a result, scientists might conclude that the majority of Earth's animals are already extinct because they have noted that certain qualities and traits are absent from species that are still alive.

The phrase "extinction" refers to the end of a particular type of organism or a set of types, typically a species. Although the ability to reproduce and bounce back may have been lost earlier, the death of the last individual of the species is widely considered to be the moment of extinction.

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It has long chains of molecules that are tangled at room temperature that make it a good material for making bowls.

The smallest particle of a material that possesses all of its physical and chemical characteristics. One or more atoms make form a molecule. A molecule is the smallest particle of any material that may exist independently while retaining the physical and chemical characteristics of the substance and is composed of one or more components. Molecules are further subdivided into atoms. For example, an oxygen atom is denoted as O, whereas an oxygen molecule is denoted as O2. Molecules are classified into three types: atom molecules, element molecules, and compound molecules.

Here,

It features lengthy chains of molecules that are tangled at room temperature, making it an excellent material for bowls.

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1.00 mol of water contains the most hydrogen atoms.

1 mol of water(H2O) contains 2 mol of hydrogen atoms

molar mass of hydrogen = 1.01 g/mol,

so 1 mol of water contains 21.01 = 2.02 g of hydrogen.

1 mol of Ammonia (NH3) contains 1 mol of hydrogen atoms

molar mass of hydrogen = 1.01 g/mol,

so 1 mol of ammonia contains 11.01 = 1.01 g of hydrogen.

hydrogen in 10.0 g of water  = 4.83 ×[tex]10^(22)[/tex] hydrogen atoms

hydrogen in  15.00 g of ammonia = 1.48  ×[tex]10^(23)[/tex] hydrogen atoms.

1 mol of water contains the most hydrogen atoms. This is because water, chemically represented as H2O, contains two hydrogen atoms for every oxygen atom. While 1 mol of ammonia(NH3) contains 1 mol of hydrogen atoms, 1 mol of water contains 2 mol of hydrogen atoms.

Therefore, 1 mol of water contains more hydrogen atoms than 1 mol of ammonia, and that's why option 3 -1 mol of water contains the most hydrogen atoms out of the options provided.

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Answer:

look at the attachment I wrote it out for you.

a) The percentage abundance determines the relative atomic mass.

b) The relative atomic mass for the element X is122.5 amu

c) The Rutherford's model explained showed the movement of the electrons.

The isotopes are the kinds of atoms of an element that we can see. We know that all the element that we have in the periodic table are composed of the isotopes and the isotopes of the elements are important in the determination of the relative atomic mass of the element that we may be considering here called X

We can now be able to see from the forgoing that we have here that;

Relative atomic mass = Weighted average of all the isotopes

As such we have;

(121 * 0.432) + (123 * 0.531) + (129 * 0.0370)

52.27 + 65.31 + 4.773

=122.35 amu

The Rutherford model of the atom can also be called the planetary model of the atom and this is the model that can be able to explain to us the way that the electrons move round the nucleus.

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The structure is attached with  the  answer. 5-tert-butyl-2-methyl-3-octyne is a hydrocarbon molecule with a chain of 14 carbon atoms, so it is an alkyne.

At the beginning of the chain is a triple bond, which is the characteristic feature of an alkyne. The chain also contains two methyl and one tert-butyl group. The methyl group is attached to the second carbon atom in the chain, while the tert-butyl group is attached to the fifth carbon atom in the chain.

This molecule has a total of 20 hydrogen atoms, with three hydrogen atoms attached to each of the carbon atoms in the chain.  5-tert-butyl-2-methyl-3-octyne is a relatively reactive molecule because of its triple bond. This molecule can undergo a variety of reactions, including addition reactions, oxidation reactions, and substitution reactions. The reactivity of this molecule makes it a useful chemical in a variety of industrial and laboratory applications.

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ionic and polar compounds are highly soluble in water whereas the covalent and organic compounds are highly insoluble in water

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It contain 2 mol of HCl. To find the moles of HCl, you have to change the volume units into dm³ or liter.

How to calculate the value of that HCl mole?

As per data given:

Vacid = 100 cm³

Molacid = 0.2 mol/dm³ = 0.2 mol/L

First, we have to change volume unit into liter or dm³. So

Vacid =  100 cm³ = 0.1 L

Then calculate the moles of HCl:

Moles of HCl = Molacid : Vacid

Moles of HCl = 0.2 : 0.1

Moles of HCl = 0.2 x 10

Moles of HCl = 2 mol

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The ideal gas law describes the behavior of a gas under ideal conditions, which typically means that it is at a low density and a high temperature.

When these conditions are met, the gas will behave in a manner that is consistent with the ideal gas equation. Generally, a gas will exhibit its ideal properties when it is in a container with a large volume, has a low pressure, and is at a high temperature.

Additionally, the gas particles must be small and non-interacting, meaning that they do not interact with each other. When these factors are taken into account, a gas will most likely display the ideal gas properties predicted by the ideal gas law.

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Answer:

it decreases land temperature near the ocean

You can compare the rates of effusion of two gases in a mixture by their molecular weights.

The square root of a gas's molecular weight has an inverse relationship with the rate of effusion of that gas. Therefore, you may compute the square roots of two gases' molecular weights and then invert that ratio to compare the rates of effusion of the two gases in a mixture.

The rate of effusion will be slower for the gas with the greater molecular weight and faster for the gas with the lower molecular weight.

For instance, the ratio of two gases' rates of effusion is given by R = (M1 / M2)-1 if their molecular weights are M1 and M2, respectively.

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according to the question, All the reactions in a path are added together.

What is the reactions?

Reactions are the processes in which one or more substances are changed into one or more new substances. They are caused by a chemical change in which the atoms of the reactants rearrange to form the atoms of the products. Reactions can be classified according to the type of energy released or absorbed during the reaction, such as exothermic and endothermic. Reactions can also be classified according to the type of reactants involved, such as single-replacement and double-replacement reactions. Reactions can occur quickly and release a large amount of energy, or they can occur slowly and release little or no energy. Reactions can also occur in a series of steps, such as in a reaction mechanism. In general, reactions require reactants, a catalyst, and an energy source in order to occur.

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You would observe that the rock absorbs heat more quickly than the water and releases it more slowly. The rock will reach room temperature more quickly if you let them cool.

The majority of solar radiation that hits water's surface is reflected back into the atmosphere. Given that land absorbs more solar radiation, both the land's surface and the vegetation it supports retain more heat.

Water absorbs and releases heat more slowly than land because its specific heat is higher than that of dry soil. Due to the high heat capacity of water, large bodies of water often tend to moderate the temperature of neighboring land.

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The mass of Be(NO₂)₂ required to make 550 mL of a 2.5 M solution is 126.25 g.

Molar concentration is a measurement of the concentration of a solute in a solution, in terms of the quantity of material per unit volume of solution. The number of moles per liter, represented by the unit sign mol/L or mol/dm³ in SI units, is the most common way to measure molarity in chemistry.

Mathematically;

Molar concentration = number of moles/volume in liters

The number of moles is also determined using the formula below:

Number of moles = mass/molar mass

Hence;

Molar concentration = mass / molar mass * volume in liters

Therefore:

mass = Molar concentration * molar mass * volume in liters

The molar mass of Be(NO₂)₂ = 101 g/mol

Mass of  Be(NO₂)₂ required = 2.5 * 500 * 1/1000 * 101

Mass of  Be(NO₂)₂ required = 126.25 g

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a) The concentration of the hydrogen ions is  1 * 10^-7 M

b) The concentration of the hydroxide ions is  1 * 10^-7 M

c) Ratio of the hydrogen to the hydroxide ion is 1:1

We know that the pH of the solution would have to do with ratio of the hydrogen ion and the hydroxide ions that we have in the solution. We know that the pH values that range from 0 -6 is acid, 7 is neutral and 8 - 14 is basic.

Then we have that;

Concentration of the hydrogen ion in the solution is obtain from the formula;

[H^+] = Antilog (-pH)

At pH 7 we have;

[H^+] = Antilog (-7)

= 1 * 10^-7 M

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Answer:

Yes it's true ooooooooo

The pressure of C2H4 and N2 gas is 0.3 atm

Based on the information provided, it appears that C2H4 and CH4 are added to a mixture of CO and N2 and then exposed to excess oxygen. The resulting mixture is then placed in a rigid container at a constant volume, and the pressure of CO2 and H2O vapor is measured to be 0.9 atm and 0.8 atm, respectively.

If the number of moles of C2H4 and CH4 is equal, the sum of the pressure of C2H4 and N2 gas can be calculated by subtracting the pressure of CO2 and H2O vapor from the total pressure. Since the total pressure is 1 atm, the sum of the pressure of C2H4 and N2 gas is:

1 atm - 0.9 atm - 0.8 atm = 0.3 atm

It is worth noting that this answer is based on the information provided and any additional information or assumptions may affect the final result.

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The molar mass of the gas would be 16.36 g/mole.

The formula for molar mass: M = (m.RT)/ (P.V)

P stands for the pressure of the ideal gas

V stands for the volume of the ideal gas

R stands for the universal gas constant

T stands for the temperature.

In this case, we are given that:

P = 1 atm (standard conditions)

T = 273K (standard conditions)

R = 0.082 lit. atm. K⁻¹.mol⁻¹

Mass of gas (m) = 0.399 g

Volume of gas (V) = 550 mL = 0.55 L

Therefore, the molar mass of the gas would be:

M = (m.RT)/ (P.V)

M = (0.399 x 0.08206 x 273) / (1 x 0.55)

M = 16.36 g/mole

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The ionic compound's metal will be replaced with AI. True for Fe2O3

Atomic bonds can be covalent or ionic in nature. The structures and characteristics of these bonds vary. Pairs of electrons are included in covalent bonds through the binding of two atoms in a specific orientation. Ionic bonds, on the other hand, are bonds that connect two ions.

Ionic bonding will typically be present in compounds where a metal is bound to either a quasi or a semi-metal. Molecular compounds are those that contain only non-metals or quasi combined with non-metals and exhibit covalent bonding.

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The parent component in the structure of 1,4- dimethyl cyclohexane is cyclohexane, which has two methyl groups attached at the first and fourth positions of the carbon ring.

Cyclohexane is a saturated hydrocarbon with the molecular formula CₙH₂ₙ where n represents the number of carbon atoms present in the organic compound. They are represented as simple polygons with the sides representing carbon-carbon bonds. Each carbon atom is held together by two hydrogen atoms. A molecule's multiple rings may share one or more common atoms. One carbon atom is shared by two rings in spirocyclic compounds. These compounds are uncommon.

According to the IUPAC system, cycloalkanes are named with the prefix cyclo-.

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The answer is Two molecules of carbon dioxide are released during one turn of the citric acid cycle.

Two carbons - from acetyl CoA-enter the citric acid cycle in each turn, and two carbon dioxide molecules are released. However, the carbon dioxide molecules don't actually contain carbon atoms from the acetyl CoA that just entered the cycle.

Instead, the carbons from acetyl CoA are initially incorporated into the intermediates of the cycle and are released as carbon dioxide only during later turns. After enough turns, all the carbon atoms from the acetyl group of acetyl CoA will be released as carbon dioxide.

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Answer:

yes, odor is classified as a physical property

Explanation:

In general, ionization energy increases across a period and decreases down a group. Across a period, effective nuclear charge increases as electron shielding remains constant.

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Laura could use a few different methods to determine which beakers contain pure water and which contain solutions. One method is to test the boiling point of each liquid. Pure water boils at 100 degrees Celsius at standard pressure. If the liquid in a beaker boils at a temperature higher than 100 degrees Celsius, it is likely a solution and not pure water. Another method is to test the freezing point of each liquid. Pure water freezes at 0 degrees Celsius at standard pressure. If the liquid in a beaker freezes at a temperature other than 0 degrees Celsius, it is likely a solution and not pure water.

Another method is through density test. Pure water has a density of 1g/cm³ at 4°C. Laura can use a hydrometer, which is an instrument that measures the density of a liquid to check if the density of the liquids in the beakers is equal to 1g/cm³. If it is not, then it is not pure water.

Additionally, Laura could also test the conductivity of the liquids. Pure water is a poor conductor of electricity, whereas solutions can conduct electricity. Laura could use a conductivity meter to check the conductivity of the liquids. If a liquid conducts electricity, then it is likely a solution and not pure water.

Finally, Laura could also use a refractometer, which measures the refractive index of the liquid. The refractive index of pure water is 1.333 and any deviation from this value indicates the presence of dissolved solutes.

It's important to notice that no single test can confirm that a liquid is pure water, but a combination of tests can give us a strong indication of it.

Atoms of different metals can differ in number of protons, electron configuration, atomic radius, melting/boiling point, hardness/ductility, and conductivity.

Atoms of different metals can differ from each other in a number of ways, including:

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Answer:Gas is the answer

The amount of the aluminum oxide that is formed is  2.5 moles.

We must have it at the back of our minds that in the case of the questions that involves stoichiometry, the limiting reactant can be said to be the compound that is used up in the reaction.

We are told here that the substance that has been used up in this reaction is the aluminum then it means that this must be the limiting reactant here.

If 4 moles of aluminum produces 2 moles of aluminum oxide

5 moles of aluminum would produce 5 * 2/4

= 2.5 moles of aluminum oxide.

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The elements and compounds present after a chemical reaction are called the products.

The limiting reactant if 70.0 g of C7H6O3 and 80.0 g of C4H6O3 react is salicylic acid (C7H6O3).

In this case, given that:

70g C7H6O3

80g C4H6O3

Molar mass of C7H6O3 = 138 g/mol

Molar mass of C4H6O3 = 102 g/mol

So, we need to convert C7H6O3 to C4H6O3 as below:

= 70g C7H6O3

= (molar mass of C4H6O3 / molar mass of C7H6O3) * mass of C7H6O3

= (102 / 138) * 70

= 51.74g C4H6O3

Thus, when 70.0 g of C7H6O3 and 80.0 g of C4H6O3 react, it will be:

80g C4H6O3 – 51.74g C4H6O3 = 28.26g C4H6O3

And, that means there are 28.26g C4H6O3 left after reacting it with C7H6O3.

Hence, the limiting reactant is salicylic acid (C7H6O3).

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