What are some examples of evidence that support Darwin's theories of evolution and natural selection?

Answer:

This is true. A seismograph measures the size of a volcano eruption by detecting the vibrations that are produced by the volcanic activity. The vibrations can then be converted into a numerical value that represents the magnitude of the eruption.

Explanation:

In a car engine, energy in the fuel's chemical energy stores is transferred to useful kinetic energy stores.

Explanation:

Chemical energy is the form of energy held within the fuel. A car's engine operates by burning fuel. The fuel is burned, creating mechanical energy that moves the vehicle. The engine thus transforms chemical energy into mechanical energy.

By applying pressure to the pistons and exerting work on them, the internal combustion engine of a car transforms the potential chemical energy in gasoline and oxygen into thermal energy, which is then translated into mechanical energy that drives the vehicle (raising its kinetic energy).

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To determine the value of Kp for a reaction, we need to know the concentrations of all the reactants and products at equilibrium.

In this case, we are not given the equilibrium concentrations, so we cannot directly calculate Kp. Instead, we can use the ideal gas law to relate the equilibrium concentrations to the partial pressures of the gases, and use those partial pressures to calculate Kp.The equation for the ideal gas law is PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature. If we assume that the reaction occurs at a constant volume and a constant temperature, we can use the ideal gas law to relate the equilibrium partial pressures of the gases to the concentrations of the gases.Given that we have no information about the equilibrium concentrations or partial pressures, we can not calculate Kp.

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Answer:

B.  Mg3N2

Explanation:

There are 20.0 grams total material (14.4g Mg and 5.6 g N).  We can convert grams into moles of each element by dividing by that element's molar mass (g/mole) to yield the number of moles of each element.  To find the empirical formula, we need to convert the moles of each to a whole number by using a fracor that provides a whole number for each element.  5 works well, and we get 0.6x5 = 3 Mg atoms and 0.4x5 = 2 N atoms.

Mass % g/mole grams moles       Factor of 5

Mg 72.00% 24.305 14.4         0.6             2.962 or 3

N 28.00% 14.007 5.6         0.4             1.999  or 2  

100.0%          20          1.0      

There are 3 Mg and 2 N atoms per molecule.  The empirical formula is Mg3N2.

When mixing and storing materials, volumetric flasks are utilized to determine volumes.

A volumetric flask is a piece of plastic or glass lab equipment used to make solutions. It is applied to prepare a solution with a specific volume. Compared to beakers or Erlenmeyer flasks, volumetric flasks can be used to measure volumes significantly more precisely.

When it's important to know the volume of the mixture being made exactly and properly, a volumetric flask is utilized. Similar to volumetric pipets, the size of a volumetric flask varies according to the solution volume that is being made.

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The goal of the light reaction is to make NADH an high energy electron transporter and ATP an energy storing molecule.

The energy storage molecule ATP and the reduced electron carrier NADPH are produced by the light-dependent processes using light energy, which is required for the subsequent stage of photosynthesis. Light reactions in plants occur in the thylakoid membranes of organelles referred to as chloroplasts.

The light reactions are largely controlled by photosystems, sizable complexes of proteins and pigments (light-absorbing molecules) that are designed to capture light. Photosystem I (PSI) and Photosystem II are the two different types of photosystems (PSII).

Both photosystems have a variety of pigments that aid in the absorption of light energy as well as a unique pair of chlorophyll molecules at the reaction center. P700 denotes the special pair of photosystem I, while P600 denotes the unique pair of photosystem II.

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The pH of each of the following solutions of a strong acid in water for (a) 0.16 M HCl is 0.78, (b) 4.4 M HClO4 is 3.35, (c) 2.31011 M HI is 10.64.

A strong acid is an acid that is completely ionized in water. Therefore, the pH of a solution of a strong acid in water can be calculated using the following formula:

pH = -log[H+]

(a) 0.16 M HCl:

= [H+]

= 0.16 M

pH

= -log(0.16)

= -(-0.78)

= 0.78

(b) 4.4 M HClO4:

[H+]

= 4.4 M

pH

= -log(4.4)

= -(0.35)

= 3.35

(c) 2.3 x 10^-11 M HI:

[H+]

= 2.3 x 10^-11 M

pH

= -log(2.3 x 10^-11)

= -(-10.64)

= 10.64

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Answer:

Term

Liquid    C) takes the shape and volume of an entire container

Plasma    A) charged particles that do not have a definite shape or volume

Solid    B) has a fixed volume and shape

Gas    D) assumes the shape of the part of the container from the bottom up

A total volume of 100 mL of solution is created by mixing 5g of NaCl with water. The NaCl solution has a molarity of 0.151515.

Weight of NaCl=5 gm.

No.of moles of NaCl = Weight/ Mole .Wt =5/58.5= 0.08547

Weight of water= 100 gm.

Number of water moles = Weigh/Mole Wt =100/18=5.55556

Mole. Fraction of NaCl

=No.of moles of NaCl/ No.of molesNaCl+H2O =0.08547/(0.08547+5.55556)

=0.08547/5.64103 =0.151515

The amount of moles of a solute in a litre of solution is known as its molarity. A capital M is used to represent molarity.

A solution in chemistry is a combination of two or more compounds in which neither ingredient undergoes a chemical transformation. For instance, salt water is a solution that contains both salt and water (the solvent) (the solute). The concentration of a material in a solution is its amount of dissolution. In other words, it refers to the number of ingredients that have been added to your drink. In molarity, concentration is often expressed.

A mole is a fundamental chemical unit. It is the mass of a substance (in grammes) that has the same number of atoms, molecules, or ions as 12 grammes (6.022 x 1023) of carbon-12.

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[tex]NH_{4} Br[/tex](aq ) is expected to have a Ph less than 7 as on dissociation the following constituents will separate

[tex]NH_{4} Br[/tex]    +  [tex]H_{2}O[/tex]    → [tex]NH_{4} OH[/tex](weak base)    +   [tex]HBr[/tex] (strong acid)

A weak base is a strong acid hence B is  correct

[tex]LiNO_{3}[/tex] It is a salt of a strong base and weak acid hence basic  and a PH greater than 7

[tex]MgCl_{2}[/tex]it is a salt of a strong base and strong acid hence a neutral solution of PH 7

[tex]RbCH_{2} H_{3} O_{2}[/tex] It is a salt of a strong base and weak acid hence basic  and a PH greater than 7

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Answer:

a. 2H2 + O2--> 2H2O

b. 2ZnS +3O2-->2ZnO +2SO2

Explanation:

a.

note:

(when you put coefficients before the elements or the compounds you should multiply it by each element and the number that's on its right...

so if it's 2H2O

that is 2xH2 which is 4 hydrogen atoms

and 2 x O which is 2 oxygen atoms )

......

on the left side of the equation

there are two atoms of oxygen

but on the right side there's only one atom

so in order to balance them you have to put 2 as a coefficient for H2O

H2+O2 ->2H2O

so now you have 2 hydrogen atoms on the left side and 4 on the right side

you put 2 as a coefficient for H2

and now

there's 4 hydrogen atoms on both sides

and 2 oxygen atoms on both sides

b.

you do the same here

ZnS + O2 -> ZnO + SO2

2 oxygen atoms ---> 3 oxygen atoms

ZnS + 2O2 -> ZnO + SO2

4 oxygen atoms ---> 3 oxygen atoms

ZnS + 2O2 -> 2ZnO + SO2

4 oxygen atoms ---> 4 oxygen atoms

but

1 Zn ---> 2Zn

2ZnS + 2O2 -> 2ZnO + SO2

2S --> 1S

2ZnS + 2O2 -> 2ZnO + 2SO2

2S--> 2S

but

4O---> 6O

2ZnS + 3O2 -> 2ZnO + 2SO2

In literary classes, the three most popular types are verbal irony, dramatic irony, and situational irony. When a speaker or narrator says something that contradicts what they mean, what they intend, or what the context necessitates, this is called verbal irony.

One thing is expressed while another is meant in an ironic statement. For example, on a chilly, wet gray day, you would exclaim, "What a gorgeous day!" Alternatively, if you were suffering from a severe case of food sickness, you may respond, "Wow, I feel terrific today." "ffers points of view and ideas that are, at most, intriguing... However, it does not reach the truth." Ronagh and Souder are particularly concerned with scientific assertions that are not meant to be taken seriously.

Here,

The three most common varieties in literary studies are verbal irony, dramatic irony, and situational irony. Verbal irony occurs when a speaker or narrator says something that contradicts what they mean, what they intend, or what the context requires.

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Answer:

You have not shown the liquid which is to be shown, please show us

Frida wants to find the volume of a stone by measuring the change in water volume before and after the stone is added.  the volume of the stone is 26 cm³.

Frida wants to find the volume of a stone by measuring the change in water volume before and after the stone is added. She fills a measuring cup with 473 mL of water and drops the stone in, causing the water level to rise to 499 mL. Using the conversion factor that 1 mL = 1 cm³, the initial volume of water is 473 cm³ and the final volume of water is 499 cm³. By applying the equation [Volume of stone] + [Initial water volume] = [Final water volume],

substituting the values

⇒ xcm3 +473cm3 = 499cm3

xcm3 =499cm3 −473cm3

xcm3 =26cm cube

the volume of the stone can be determined to be 26 cm³.

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The empirical and molecular formula of benzene is CH and C6H6 that contains only carbon and hydrogen and the mass of hydrogen is 7.74%.

Molar mass of benzene is = 78.1%

Hydrogen = 7.44%

We have to find empirical and molecular formula

We calculate the percentage of Carbon in the compound is as follow:

Percentage of compound = 100%

Hydrogen = 7.44%

We have find the percentage of carbon

Carbon = (Percentage of compound) - (Hydrogen)

= 100-7.44

= 92.56%

Calculate empirical formula:

Carbon (C) = 92.56%  Hydrogen (H) = 7.44% Empirical formula = ?

Firstly, divide by their molar mass

C = 92.56 / 12 = 7.71, H = 7.44 / 1 = 7.44

Divide by the smallest

C = 7.71 / 7.74 = 1, H = 7.44 / 7.44 = 1

Empirical formula of benzene = CH

Calculate Molecular formula

Molecular mass of benzene = 78.1 g / mol. Empirical formula = CH, Molecular formula = ?

Molecular formula = Empirical formula  X n

Molecular formula = molar mass

Therefore, Empirical formula x n = molar mass

[CH]n = 78.1, [12 + 1]n = 78.1,

13n = 78.1

Divide both sides by 13

n = 78.1 / 13

n = 6

Molecular formula = C6H6

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A neon sign contains 2.01 x 10^25 atoms of gas. 3.34 x 10^-3 moles of neon are in the sign.

The term mole is defined as the amount of substance of a system which contains as many elementary entities.

1 mole is equal to 6.023 × 10 ²³ molecules.

According to Avogadro's constant, in one mole, there are 6.02 x 10^23 atoms.

To calculate how many moles are in 2.01 x 10^21 atoms, you would divide it by the amount of atoms that fit in a mole.

2.01 x 10^21 atoms / 6.02 x 10^23

= 0.00334 moles,

= 3.34 x 10^-3 moles

Thus, A neon sign contains 2.01 x 10^25 atoms of gas. 3.34 x 10^-3 moles of neon are in the sign.

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Your question is incomplete, most probably your question was

A neon sign contains 2.01 X 1021 atoms of the gas. How many moles of neon are in the sign?

a1.21 X 1045 mole Ne

b3.34 X 10-3 mole Ne

c2.00 X 102 mole Ne

d12.10 X 102 mole Ne

(C) moved faster and spread farther apart

An increase in temperature indicates the molecules in the liquid move faster and spread farther apart. The mercury thermometer was named after physicist Daniel Gabriel Fahrenheit in Amsterdam. Mercury thermometers are useful in many ways such as measuring body, liquid, and vapor temperature. The movement of the liquid in a thermometer shows changes in temperature. With an increase in temperature shows the molecules in the liquid are moving faster and the temperature is rising in the thermometer. The mercury expands to indicate a higher temperature up the tube which is marked in order to recognize a measurement of temperature. Mercury thermometers are rare today as most of them are toxic nowadays. A Mercury thermometer consists of a bulb containing mercury attached to a glass tube; the volume of mercury in the tube is much less than the volume in the bulb.

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The volume of 0.145 M NaOH is required to reach the equivalence point in the titration of 45.0 mL of 0.105 M HNO₃ is 32.58 mL.

Given that :

the molarity of the HNO₃ , M1 = 0.105 M

the volume of the HNO₃ , V1 = 45 mL

the molarity of the NaOH , M2 = 0.145 M

the volume the NaOH , V2 = ?

by using the equation given below , we get:

M1 V1 = M2 V2

0.105 × 45 = 0.145 × V2

V2 = 4.725 / 0.145

V2 = 32.58 mL

Thus volume of the NaOH is 32.58 mL.

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NO2(OH) dissolved in water is an example of an acidic salt.

Acidic salts are formed when a strong acid and a weak base react together. They are acidic in solution because they dissociate to form H+ ions and an anion. In this case, the acidic salt is NO2(OH), which when dissolved in water, dissociates to form H+ ions and OH- ions, resulting in an acidic solution.

Ni(OH)2 dissolved only in an acidic solution is an example of a basic salt.

Basic salts are formed when a strong base and a weak acid react together. They are basic in solution because they dissociate to form hydroxide ions (OH-). In this case, the basic salt is Ni(OH)2, which when dissolved only in an acidic solution will dissociate to form Ni2+ ions and OH- ions resulting in a basic solution.

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Answer:

Explanation:

Yes, the aerosol given off by an e-cigarette can contain dangerous chemicals, such as nicotine, ultrafine particles, volatile organic compounds, and heavy metals.

Inhaling these chemicals can increase the risk of lung and heart disease.

E-cigarettes are becoming increasingly popular as an alternative to tobacco-based cigarettes. However, many people are unaware of the potential dangers associated with using e-cigarettes. The aerosol produced by e-cigarettes can contain not only nicotine, but also other chemicals and particles that can be harmful to the user’s health. These include ultrafine particles, volatile organic compounds, and heavy metals such as lead and nickel.

When these particles and chemicals are inhaled, they can cause inflammation and irritation of the lungs and airways, leading to a variety of respiratory illnesses.

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The sample has a volume of 5.3 mL.

Sample in chemistry is the collection of atoms, molecules, or other physical forms of a substance that are used for testing, analysis, or other scientific purposes. Samples are typically collected from a larger population and then studied to understand the larger population. In chemistry, samples can range from tiny amounts of a single chemical compound to large amounts of a mixture of compounds. Sampling is important for understanding chemical properties and reactions, as it helps scientists analyze the behavior of compounds in different situations.  Sampling can also be used to determine factors such as the toxicity, stability, or reactivity of a material.

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The number of moles of oxygen a worm absorbs per hour can be calculated using the formula:

A = (LR^2dO2) / (MT)

Where A is the molar flow rate of oxygen, L is the length of the worm, R is the radius of the worm, d is the density of the worm, O2 is the concentration of oxygen in the environment, M is the molar mass of oxygen, and T is the time in hours.

The number of moles of oxygen the worm uses per hour can be calculated using the formula:

B = (k*A)

Where B is the molar flow rate of oxygen used by the worm and k is the rate constant for oxygen consumption.

To determine whether the worm is taking in oxygen at a rate fast enough to survive, we would need to compare the rate of oxygen absorption (A) to the rate of oxygen consumption (B). If A > B, then the worm is absorbing oxygen at a rate that is greater than or equal to the rate at which it is consuming oxygen, and it should be able to survive. If A < B, then the worm is not absorbing oxygen fast enough to sustain its metabolism and it may not survive.

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The organocopper and inorganic ion by-products are not shown in this structural formula.

CH3CH=CH2Li

1. The reaction starts with CH3CH2CH2Br, which is a bromoalkane.

2. The bromine atom is replaced by a lithium atom with the help of two equivalents of copper.

3. The resulting product is CH3CH=CH2Li, which is an alkenyllithium compound.

CH3CH=CH2Li

The reaction starts with CH3CH2CH2Br, a bromoalkane. The bromine atom is replaced by a lithium atom with the help of two equivalents of copper. This is done via a nucleophilic substitution reaction, where the copper serves as a Lewis acid to facilitate the reaction. The resulting product is CH3CH=CH2Li, an alkenyllithium compound. This is the major organic product of the reaction and it has an E/Z stereochemistry. The organocopper and inorganic ion by-products are not shown in this structural formula.

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Ninety-seven years is the half-life of 90Sr. A sample of 90Sr would still have 0.015 of its original atoms after 175 years. The duration needed for a quantity to fall to half its starting value is known as the half-life.

The phrase is frequently employed in nuclear physics to indicate how rapidly unstable atoms decay radioactively or how long stable atoms last. One or more electrons are attached to the nucleus of every atom, which is made up of a nucleus. Protons and neutrons, in various numbers, make up the nucleus. Neutrons exist only in the most prevalent type of hydrogen. Atoms that are neutral or ionised are the building blocks of all solids, liquids, gases, and plasma.

[A]t=[A]o/[A]t=4.18 [A]o/[A]t=e4.18=65.5

[A]o = 1.5%[A]o], where [A]t = 0.015

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There is one sigma as well as one pi bond in a double bond.

Sigma bonds and pi bonds are the two types of covalent bonds. Sigma bonds are formed when there is an end-to-end overlapping of the atomic orbitals. A pi bond is formed when there is a lateral or a side-by-side overlapping of the atomic orbitals.

The sigma bonds are represented by a "σ" symbol and pi bonds are represented by "π" symbol. One sigma bond is there in a single bond. A double bond contains one sigma as well as one pi bond. A triple bond has one sigma as well as two pi bonds.

--The given question is incomplete, the complete question is

"List the number of sigma bonds and pi bonds in a double bond. Group of answer choices 2 sigma, 0 pi 1 sigma, 2 pi 1 sigma, 1 pi 2 sigma, 3pi, 1pi 1 sigma."--

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Answer:

it is option no B using mole concept

Answer:

The correct answer is 77.0 g.

The element that has a number of electrons 14 is silicon.

Any material that is totally composed of the same kinds of atoms is said to be an element. For instance, the element carbon is made up entirely of carbon atoms. The number of protons in an atom is indicated by the element's atomic number. The quantity of protons and electrons inside a neutral atom must match.

An element's position on the periodic table is also indicated by its atomic number.

An element possesses 14 electrons, as stated in the question. Since this suggests that it must contain 14 protons, its atomic number must be 14.

In order to locate the element, we must first put down any potential electronic configurations for the element:

1s²2s²2p⁶3s²3p²

In the outermost shell, there are four electrons. The element therefore has 4 electrons in its valence shell. Therefore, this element's period number is 4.

Additionally, the element's group number will be equivalent to:

(Valence electrons + 10) or (4 + 10) equals the 14th group

The element is a p-block element as a result. And silicon is the element that corresponds to the 14th group and 4th period of the periodic table.

Thus, silicon, which possesses 14 electrons, is the correct answer.

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