How is ethanol different from carbon dioxide?

A: Ethanol is made of oxygen.

B: Ethanol is made of hydrogen.

C: Carbon dioxide only has two atoms.

D: Carbon dioxide only has one atom.

You would have to wait approximately 3,180 years for 1/5 of the radium to disappear. This is because the half-life of radium is approximately 805.4 years.

Suppose you have a cache of radium, which has a half-life of approximately 1590 years.

To determine how long you would have to wait for 1/5 of the radium to disappear, you need to use the formula for radioactive decay:

A=A₀(1/2)^(t/T)

where:

A₀ = initial amount of radium

A = amount of radium remaining after t years

T = half-life of radium

Firstly, note that 1/5 of the radium has disappeared, meaning that you have 4/5 of the radium remaining.

Therefore, A=4/5 A₀

We want to find t, the time it takes for 1/5 of the radium to disappear. This means that we need to find the time it takes for A to be reduced to 1/5

A₀ (or 2/5 A).2/5 A₀=A₀(1/2)^(t/T)2/5=(1/2)^(t/1590)

Taking the logarithm of both sides, we get:

t/1590=log(2/5)/log(1/2)

Solving for t, we get:

t = 805.4 years

Therefore, you would have to wait approximately 805.4 years for 1/5 of the radium to disappear.

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Answer:

single replacement

Explanation: N/A

Answer:

I think that the previous answer will help you with this one, Newton´s laws explain it because of the action-reaction law, the resulting forces will be balanced or overloaded in one object, depending of the mass acceleration/speed or force applied to one object.

Explanation:

Answer: Stays the same

Explanation:

The amount of water on the earth never leaves or runs out, so there will always be water. When water disappears, its just the process of evaporation. When water is evaporated into water vapor (gas state of matter), and the molecules are scattered through the air. Making the air humid, although you can not see the molecules, not even with a microscope.

Answer:

107.8682U is the molar mass of ag

9.answer is 0¯²

10.answer is I¯

11. answer is AI+³

12.answer is Cs+

13.answer is Fe+²

14.answer isCI¯

A buffer is made by dissolving HC₂H₃O₂ and NaC₂H₃O₂ In water. The equation that shows how this buffer neutralise  acid added is

H⁺ + CH₃COO⁻ ⇄ CH₃COOH. The equation that shows how this buffer neutralises added base is H⁺ +OH⁻  ⇄ H₂O

Processes of dissociation in the solution containing weak CH₃COOH acid and its salt:

CH₃COOH ⇄ H⁺ + CH₃COO⁻                   Ka = 1.8 X 10⁻⁵

CH₃COONa ⇄ Na⁺ + CH₃COO⁻

At addition of acid in solution ions of hydrogen comunicate in weak acid:

H⁺ + CH₃COO⁻ ⇄ CH₃COOH.

At addition of the basis in solution ions of hydroxide comunicate in weak electrolyte - water: H⁺ +OH⁻  ⇄ H₂O

Therefore, the equation that shows how this buffer neutralise  acid added is H⁺ + CH₃COO⁻ ⇄ CH₃COOH. The equation that shows how this buffer neutralises base added  is H⁺ +OH⁻  ⇄ H₂O

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4.56g excess reactant is left over when 17.0 g of potassium hydroxide (KOH) reacts with 20.0 g of iron (III) nitrate (Fe(NO₃)₃)

Reactants are raw materials that react with one another and form products.

Here given balanced reaction is

2KOH + Fe(NO₃)₂ → Fe(OH)₂ + 2KNO₃

Then we have to calculated the masses of KOH and Fe(NO₃)₂ from the balanced reaction

Molar mass of KOH = 39+16+1 = 56g/mol

Mass of KOH = 2×56 = 112g

And the molar mass of Fe(NO₃)₂ = 56+2[14+(16×3)]

= 56+2[14 + 48)]

= 56+2[62]

= 56+124

= 180g/mol

Then from the balanced equation

112g of KOH and 180g/mol of  Fe(NO₃)₂

Then the 17 g of KOH = 17×180/112g

= 27.32 g of Fe(NO₃)₂

Then for 20.0 g of iron (III) nitrate

Therefore Xg of KOH = 112×20/180

Xg of KOH = 12.44g

Thus 12.44g of KOH reacted

Therefore we have determine the leftover mass of the excess reactant

Mass of KOH leftover = ?

Mass of KOH leftover = (Mass of KOH given) – (Mass of KOH that reacted)

Mass of KOH leftover = 17 - 12.44g

Mass of KOH leftover = 4.56g

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Answer:

(1) Acid -------------------------------------> (G) When dissolved in water, its solution has a pH value less than 7. Acids are proton (H⁺ ion) donors.

(2) Alkali -----------------------------------> (E) The oxide, hydroxide, or carbonate of a metal that will react with an acid, forming a salt as one of the products (if a base dissolves in water it is called an alkali. Bases are proton (H⁺ ion) acceptors.

(3) Base ------------------------------------> (I) Its solution has a pH value of more than 7.

(4) Blast furnace ------------------------> (C) The huge reaction vessels used in industry to extract iron from its ore.

(5) Displacement reaction ----------> (R) A reaction in which a more reactive element takes the place of a less reactive element in one of its compounds or in solution.

(6) Mole -----------------------------------> (A) A very large number that is the amount of substance in the relative atomic or formula mass of a substance.

(7) Neutral -------------------------------> (J) A solution with a pH value of 7 which is neither acidic nor alkaline. Alternatively, something that carries no overall charge.

(8) Neutralization ----------------------> (F) The chemical reaction of an acid with a base in which a salt and water are formed. If the base is a carbonate of hydrogen carbonate, carbon dioxide is also produced in the reaction.

(9) Ore -------------------------------------> (P) Ore is rock which contains enough metal to make it economically worthwhile to extract the metal.

(10) Oxidation --------------------------> (B) A reaction where oxygen is added to a substance / or when electrons are lost from a substance.

(11) pH -------------------------------------> (O) A number which shows how strongly acidic or alkaline a solution is.

(12) Pipette ------------------------------> (N) A glass tube used to measure accurate volumes of liquids.

(13) Precipitate -------------------------> (K) An insoluble solid formed by a reaction taking place in solution.

(14) Reactant ---------------------------> (M) A substance we start with before a chemical reaction takes place.

(15) Reduction -------------------------> (S) A reaction in which oxygen is removed or electrons are gained.

(16) Salt ----------------------------------> (Q) A salt is a compound formed when some or all of the hydrogen in an acid is replaced by a metal.

(17) Strong acids ---------------------> (L) These acids completely ionize in solution and have a high concentration of H⁺ (aq) ions in solution.

(18) Universal indicator ------------> (H) A mixture of indicators that can change through a range of colors to show how strongly acidic or alkaline liquids and solutions are.

(19) Weak acids ---------------------->  (D) Acids that do not ionize completely in aqueous solutions.

C) As the intensity of a photon increases, the ability of that photon to eject an electron does not change. The relationship between the intensity of photons and the ejection of an electron can be explained by the photoelectric effect.

The photoelectric effect is the phenomenon in which electrons are ejected from a material when light is shone on it. According to the classical wave theory of light, the intensity of light is related to its amplitude, or the height of its wave. Therefore, one might expect that increasing the intensity of light would increase the energy of the electrons ejected from the material. However, the photoelectric effect could not be explained by the classical wave theory of light.
In 1905, Albert Einstein proposed that light had both wave-like and particle-like properties. According to his theory of the photoelectric effect, light was made up of particles called photons. Each photon had a certain amount of energy that was proportional to its frequency. When a photon was absorbed by a material, its energy was transferred to an electron in the material. If the energy of the photon was greater than the binding energy holding the electron to the material, the electron would be ejected from the material.

The answer to the multiple-choice question is A) As the intensity of a photon increases, the ability of that photon to eject an electron increases. This is because increasing the intensity of light increases the number of photons, and therefore the number of opportunities for a photon to transfer its energy to an electron. However, it is important to note that increasing the intensity of light does not increase the energy of individual photons, but rather the number of photons present.

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Answer:

A  mature stem that has thick bark

Explanation:

i dont know but that is what i put on my test but if you had your awnser right tell me

Answer:

It's typically a mixture of particles and rocks of all sizes

Explanation:

Answer:A bow and arrow possesses mechanical energy. When the arrow is drawn it has potential energy and when it is released it produces a force to propel the arrow towards the aimed target, therefore giving the arrow kinetic energy. When you combine both energies it creates mechanical energy.

Explanation:

Answer:

Building up potential energy when pulling it back

Explanation:

Answer:

table salt

Explanation:

Answer:

They're equal.

Explanation:

Giving an idea let's use the question:

This would depend on the temperature and pressure conditions that the helium gas is being stored under.

You see, gases have no fixed volume. They will expand when the temperature increases and/or the applied pressure decreases. On the other hand, the gas will contract when cooled or pressure is applied. So one mole of helium could occupy almost any volume, depending on how much you compress it or how cool you keep it.

However, if your helium gas is stored under standard temperature and pressure conditions (STP)(0 C and 101.3 kPa), then it would fill a box with a volume of 22.4 L. This volume is known as the standard molar volume and is the same for any gas at STP.

I will let you come up with a set of dimensions for a box that could satisfy this volume.

The required heat in BTU, for the water at 50°C to become ice at -50°C is 209 BTU/lb.

To determine the required heat in BTU, for the water at 50°C to become ice at -50°C, we need to calculate the heat of fusion and the heat of cooling of water. We can use the following formula to calculate the required heat.

Q = mL

Where:Q is the required heat in BTU.

m is the mass of water in pounds.L is the specific heat of water at the desired temperature.

Lf is the heat of fusion of water.

Lc is the specific heat of ice.

Using the above formula, we get;

Q = mLf + mL + mLc

The heat of fusion of water is 144 BTU/lb

The specific heat of water at 50°C is 1.00 BTU/lb °F.

The specific heat of ice is 0.5 BTU/lb°F.

We know that: 1°C = 1.8°F.

So,50°C = 122°F and -50°C = -58°F

Also, the mass of water is not given, so let us assume that the mass of water is 1 lb.

Thus;

Q = mLf + mL + mLc

Q = 1(144) + 1(1.00)(122-32) + 1(0.5)(-50-0)

Q = 144 + 90 + (-25)

Q = 209 BTU/lb

Therefore, the required heat in BTU, for the water at 50°C to become ice at -50°C is 209 BTU/lb.

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The concentration of bicarbonate ions decreases during metabolic acidosis due to the build-up of fixed acids.

Metabolic acidosis occurs when there is an imbalance between the production and excretion of fixed acids. This leads to an excess of fixed acids in the body, such as lactic acid and ketoacids. The excess fixed acids react with bicarbonate ions (\(HCO_{3}^{-}\)) to form carbonic acid (\(H_{2}CO_{3}\)). Carbonic acid then dissociates into water (\(H_{2}O\)) and carbon dioxide (\(CO_{2}\)), which is exhaled. As bicarbonate ions are used up in this process, their concentration decreases in the body.

Thus, bicarbonate ions combine with hydrogen ions to form carbonic acid, which then dissociates into water and carbon dioxide. When fixed acids accumulate in the body, they compete with bicarbonate ions for hydrogen ions, leading to a decrease in bicarbonate concentration and ultimately causing acidosis.

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Answer:

a is balanced

Explanation:

a) reactant/ product

(2x2)=4c / 4c

(2x6)=12h / 12 h

14o / (8o+6o)=14 o

Answer:

The correct options are;

1. 1,600

2. 100 Watts

A 23-30 watt CFL provides 1,600 lumens and is equivalent to a 100 Watts incandescent bulb

Explanation:

Brightness is measured in lumens and watts measure energy usage therefore with the use of an energy saving light bulb, the same lumination can be obtained at a lower energy usage.

According to a comparison chart for LED Lights vs. Incandescent Light Bulbs vs. Compact Fluorescents (CFLs) from USAI lightening website 23-30 watts CFL has a light output of 1,600 and is therefore produces enough light as a 100 Watts Incandescent Light Bulb

Also according to energy.gov website, CFLs save up to 75% energy such that a 23-30 watt CFL can produce the same illumination as a 100 watt incandescent bulb

Therefore we have, a 23-30 watt CFL provides 1,600 lumens and is equivalent to a 100 Watts incandescent bulb.

Answer:

1600 lumens, 100 watt incandescent

Explanation:

100% on edge (:

The type of model 2C0+ 0₂ → 2C02 shown below is a mathematical model.

A mathematical model serves as an abstraction of a system, employing mathematical principles and language. Its purpose lies in elucidating, scrutinizing, and prognosticating the behavior of said systems. Mathematical models are instrumental in problem-solving, decision-making, and the creation of novel systems.

The equation 2CO + O2 → 2CO2 exemplifies a mathematical model of carbon monoxide combustion. Within this model, the symbols CO, O2, and CO2 symbolize the respective molecules of carbon monoxide, oxygen, and carbon dioxide.

The arrows symbolize the reaction direction, while the numerical coefficients preceding the molecules denote the quantity of molecules engaged in the reaction.

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The percent recovery of aspirin is 26.7% (rounded to the nearest percent).

This can be calculated by taking the final mass of the aspirin solids (20 mg) divided by the maximum mass of aspirin present in the original 75 mg crude sample and multiplying by 100. The given data:

Mass of crude sample = 75mg

Mass of aspirin in crude sample = 100% of 75 mg = 75mg

Mass of aspirin recovered = 20mg

Using the formula to calculate the percentage yield,

Percentage yield = (mass of product obtained/ theoretical mass of product) × 100

The theoretical mass of aspirin would be the mass of aspirin that would have been obtained if there was 100% recovery.

Therefore, 20 mg / 75 mg * 100 = 26.7%.
Percentage yield = (20mg/ 75mg) × 100= 26.7%

Therefore, the percentage recovery is 26.7% (rounded off to the nearest percent).

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Answer:

Its b

Explanation:

A normal atom has a neutral charge with equal numbers of positive and negative particles. That means an atom with a neutral charge is one where the number of electrons is equal to the atomic number. Ions are atoms with extra electrons or missing electrons.

The value of "n" for the carbon-14 in charred plant for 472 AD is 1.46, and for the eruption in 512 AD, it is 1.16.

What is Carbon-14?

The age of a fossil can be estimated using the decay of a radioactive isotope called carbon-14 (14C). The half-life of carbon-14 is approximately 5730 years, which means that after 5730 years, half of the original carbon-14 in a sample will have decayed.

Given that the half-life of carbon-14 is 5730 years, we can use the following formula to calculate "n":

n = (t₂ - t₁) / t₁/2

Where:

n is the number of half-lives

t₂ is the current year (2008)

t₁ is the year of the eruption

For the eruption in 472 AD:

n₁ = (2008 - 472) / 5730

n₁ ≈ 1.46

For the eruption in 512 AD:

n₂ = (2008 - 512) / 5730

n₂ ≈ 1.16

Therefore, the value of "n" for the carbon-14 in charred plant remains in 2008 for the eruption in 472 AD is approximately 1.46, and for the eruption in 512 AD, it is approximately 1.16.

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Maxwell's Equations describe the fundamental laws of electromagnetism. In a linear, nondispersive, isotropic, and inhomogeneous medium, the wave equation can be derived from Maxwell's Equations. If the medium exhibits slowly-varying dielectric properties, the wave equation can be modified to account for the constant properties over distances comparable to the wavelength.

The wave equation in a linear, nondispersive, isotropic, and inhomogeneous medium can be derived from Maxwell's Equations by considering the electric field (E) and magnetic field (H) in the medium. The first step involves applying the curl operator to Faraday's law and Ampere's law to obtain two equations that relate the spatial derivatives of the electric and magnetic fields to their temporal derivatives.

Next, by taking the curl of these equations and applying the vector identity, we can eliminate the time derivatives and obtain two wave equations in terms of the spatial derivatives of the fields. These wave equations represent the propagation of electromagnetic waves in the medium.

A) To incorporate the inhomogeneity of the medium, we introduce a position-dependent permittivity (ε) and permeability (μ) into the wave equations. This accounts for the varying electrical and magnetic properties of the medium at different points. The resulting wave equations describe how the electric and magnetic fields propagate in a linear, nondispersive, isotropic, and inhomogeneous medium.

B) If the medium is slowly varying and its dielectric properties can be assumed constant over distances comparable to the wavelength, we can introduce the concept of an effective dielectric constant (ε_eff) into the wave equation. This allows us to simplify the wave equation by considering the average properties of the medium over the distance scale of the wavelength. The effective dielectric constant accounts for the macroscopic behavior of the medium and enables a simplified representation of wave propagation.

In summary, starting with Maxwell's Equations, the wave equation for a linear, nondispersive, isotropic, and inhomogeneous medium can be derived. If the medium exhibits slowly-varying dielectric properties, the wave equation can be modified by introducing an effective dielectric constant that represents the average properties of the medium over distances comparable to the wavelength.

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In a first-order reaction, it takes 23.02 days for 68 percent of the chemical to be destroyed.

Given,

fee constant for the destruction of pollutant = 0.1/day

We ought to discover the number of days it'll take for sixty eight percent of the chemical to be destroyed.

[A] = [A]₀e^⁻kt

in which [A] is the present awareness, and

[A]₀ is the initial awareness

k is the price of decrement

[A]₀ = 1

[A] = 0.1

Or, t =㏑(10)/k

Or, t = 2.302/zero.1

Or, t = 23.02 days.

for this reason the wide variety of days required for the destruction of sixty eight percent of chemicals is 23 days.

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Explanation:

photosynthesis is the series of chemical reactions.The raw materials for these reactions are carbon dioxide and water and the products are glucose(sugar) and oxygen. Energy for the chemical reactions comes from the sun.

Acetals can be hydrolyzed using catalytic acid to produce a carbonyl compound and alcohol. If the acid concentration is increased, acetal can be hydrolyzed back to its initial aldehyde or ketone form.

This mechanism occurs in the opposite direction of the acetal formation mechanism. The hydrolysis of each acetal generates a carbonyl compound and an alcohol.What are Acetals?Acetals are organic compounds that are formed by the reaction of an aldehyde or ketone with two molecules of alcohol, and they have the following general structure: R1R2C(OR')2.Acetals can be regarded as derived from hemiacetals, which are formed by the reaction of an aldehyde or ketone with one molecule of alcohol.The carbonyl carbon in an acetal is bonded to two alkoxide (OR) groups, while the carbonyl carbon in a hemiacetal is bonded to only one. As a result, acetals are more stable than hemiacetals. Acetals are widely used in organic synthesis, including as protecting groups for carbonyl groups in reactions that would otherwise destroy them.Example:Acetal hydrolysis occurs when an acid catalyst is used to cleave the two ether bonds in the molecule. When an acetal is hydrolyzed with an acid catalyst such as H2SO4, a carbonyl compound and an alcohol are formed.Example:H2SO4 is added to the acetal, which hydrolyzes it, producing an aldehyde or ketone and two alcohol molecules. For example, if dimethyl acetal is hydrolyzed, it will yield acetone and two methanol molecules.

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O^{-3} means Oxygen ion has taken 3 electrons .