select all the statements that correctly explain why ethylene has a zero dipole moment, whereas propene has a small dipole moment of 0.3 d. multiple select question. the small dipole moment in propene arises from the electron-withdrawing ability of the methyl group. ethylene is symmetrical; all the bond dipole moments cancel out. the small dipole moment in propene arises from the electron-donating ability of the methyl group.

M is a transition metal with variable valence. One possibility is that M is iron (Fe), which has a valence of 2 or 3 in many of its compounds. Another possibility is that M is copper (Cu), which has a valence of 1 or 2 in many of its compounds. Further experiments or analysis would be needed to confirm the identity of the metal.

We can use Faraday's laws of electrolysis to determine the identity of the metal M.

First, we can use Faraday's first law, which states that the amount of a substance produced at an electrode during electrolysis is directly proportional to the amount of electric charge passed through the electrode.

The amount of electric charge passed through the electrode can be calculated as:

Q = It = 1.20 A × (2 hours + 33 minutes) × 60 s/min = 5220 C

where I is the current,

t is the time, and

Q is the electric charge.

Next, we can use Faraday's second law, which states that the amount of substance produced by the passage of a given amount of electric charge is proportional to the equivalent weight of the substance.

The equivalent weight of a substance is its atomic weight divided by its valence (the number of electrons involved in the reaction).The equivalent weight of M can be calculated as:

Equivalent weight = atomic weight / valence

Let's assume that the metal M has a valence of x. Then, the amount of M produced can be calculated as:

Amount of M = (mass of M plated out) / (equivalent weight of M)

Substituting the given values, we get:

Amount of M = 2.97 g / [(atomic weight of M) / x]

We don't know the atomic weight of M, but we can simplify the equation by dividing both sides by x:

Amount of M / x = 2.97 g / atomic weight of M

Now we can use Faraday's second law to relate the amount of M produced to the electric charge passed through the solution:

Amount of M / x = Q / (F × n)where F is the Faraday constant (96,485 C/mol),

and n is the number of moles of electrons involved in the reaction.

For the reaction MClx + x e- → M, n is equal to x.

Substituting the given values and solving for x, we get:

x = [2.97 g / (1.20 A × 2 hours + 33 minutes × 60 s/min)] × (F × x) / 1 molx = 1.50The valence of the metal M is 1.5, which is not a whole number.

This suggests that M is a transition metal with variable valence. One possibility is that M is iron (Fe), which has a valence of 2 or 3 in many of its compounds. Another possibility is that M is copper (Cu), which has a valence of 1 or 2 in many of its compounds. Further experiments or analysis would be needed to confirm the identity of the metal.

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 D).Weak attractive forces. A solid is a state of matter characterized by particles (molecules, ions, or atoms) that are tightly packed and held together by strong attractive forces.

This results in a fixed volume, meaning that solids have a definite shape and volume. The distances between the particles in a solid are very close, making it difficult to compress the solid, hence the term "virtually incompressible."
The attractive forces between particles in a solid can vary in strength. In general, solids have strong attractive forces that hold the particles together in a rigid structure. These forces can be ionic, covalent, or metallic depending on the type of solid. For example, in an ionic solid like sodium chloride (NaCl), the positive and negative ions are held together by strong electrostatic forces. In a covalent solid like diamond, the atoms are held together by strong covalent bonds. In a metallic solid like copper, the metal atoms are held together by a sea of delocalized electrons.

However, there are some solids where the attractive forces between particles are relatively weak. These are called amorphous solids, such as glass. In amorphous solids, the particles are arranged in a random manner and do not have a regular crystal structure like other solids. The weak attractive forces in amorphous solids allow the particles to move more easily, giving these solids some characteristics of liquids, such as the ability to flow slowly over time.

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It takes approximately 100.704 years (since 1964) until only 9 percent of the original amount of radioactive strontium-90 absorbed remains.

The half-life of radioactive strontium-90 is given as 29 years, which means that every 29 years, the amount of radioactive strontium-90 is reduced by half.

To find the number of years it takes until only 9 percent of the original amount remains, we can set up the following equation:

(0.5)^(t/h) = 0.09

Where:

t represents the number of years since 1964 (the initial time),

h represents the half-life of 29 years, and

0.09 represents 9 percent.

Let's solve for t:

(0.5)^(t/29) = 0.09

Taking the natural logarithm (ln) of both sides:

ln[(0.5)^(t/29)] = ln(0.09)

Using the logarithmic property: ln(a^b) = b × ln(a):

(t/29) × ln(0.5) = ln(0.09)

Dividing both sides by ln(0.5):

t/29 = ln(0.09) / ln(0.5)

t = 29 × (ln(0.09) / ln(0.5))

Using a calculator, we can find the value of t:

t = 29 × (-2.40794561 / -0.69314718)

t = 100.704

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It would require approximately 19,008 joules of energy to heat a frozen can of juice (360 grams) from -5 °C to 110 °C.

We need to use the specific heat capacity formula:

Q = mcΔT

Where

First, we need to convert the mass of the can of juice from grams to kilograms:

m = 360 g = 0.360 kg

Next, we need to find the specific heat capacity of the juice. The specific heat capacity varies depending on the type of juice, but for the purposes of this calculation, we can assume a value of around 4200 J/kg°C, which is the specific heat capacity of water.

c = 4200 J/kg°C

Finally, we can calculate the energy required to heat the can of juice:

Q = mcΔT

Q = (0.360 kg)(4200 J/kg°C)(110°C - (-5°C))

Q = (0.360 kg)(4200 J/kg°C)(115°C)

Q = 19,008 J

Therefore, it would require approximately 19,008 joules of energy to heat a frozen can of juice (360 grams) from -5 °C to 110 °C.

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Answer:

boiling point, temperature at which the pressure exerted by the surroundings upon a liquid is equaled by the pressure exerted by the vapour of the liquid; under this condition, addition of heat results in the transformation of the liquid into its vapour without raising the temperature.

Explanation:

Radhe Radhe❤

Explanation:

The point at which a matter melts is called boiling or melting point.

A temperature of -280°C is impossible because it is below absolute zero which is the lowest possible temperature that can be reached.

Absolute zero is defined as -273.15°C or 0 Kelvin.

The stabilizing resonance structure present in peptide bonds contains a delocalized double bond between the carbonyl carbon and the nitrogen atom of the neighboring amino acid, which allows for electron sharing and greater stability.

Peptide bonds, which link amino acids in proteins, are planar and rigid due to the presence of a partial double bond character. This is because the lone pair electrons on the nitrogen atom of one amino acid can delocalize onto the carbonyl carbon of the adjacent amino acid, forming a resonance structure with a partial double bond character between the carbonyl carbon and the nitrogen atom. This delocalization of electrons leads to a more stable structure, which is why peptide bonds are highly resistant to hydrolysis. The presence of this resonance structure also affects the reactivity of the peptide bond and plays a crucial role in protein structure and function.

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The mass of PbI2 produced is 105 g (to three significant digits).

The mole ratio of KI to PbI2 in the balanced chemical equation is 2:1.

The molar mass of PbI2 is 461.01 g/mol.

To solve this problem, we need to use stoichiometry to convert the given number of moles of KI to the mass of PbI2 produced.

From the balanced chemical equation, we can see that 2 moles of KI react with 1 mole of Pb(NO3)2 to produce 1 mole of PbI2. Therefore, the mole ratio of KI to PbI2 is 2:1.

We can use this ratio to calculate the number of moles of PbI2 produced:

0.455 moles KI x (1 mole PbI2 / 2 moles KI) = 0.228 moles PbI2

Next, we can use the molar mass of PbI2 to convert moles to grams:

0.228 moles PbI2 x 461.01 g/mol = 105.19 g PbI2

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The mass of PbI2 produced is 105 g (to three significant digits).

The mole ratio of KI to PbI2 in the balanced chemical equation is 2:1.

The molar mass of PbI2 is 461.01 g/mol.

To solve this problem, we need to use stoichiometry to convert the given number of moles of KI to the mass of PbI2 produced.

From the balanced chemical equation, we can see that 2 moles of KI react with 1 mole of Pb(NO3)2 to produce 1 mole of PbI2. Therefore, the mole ratio of KI to PbI2 is 2:1.

We can use this ratio to calculate the number of moles of PbI2 produced:

0.455 moles KI x (1 mole PbI2 / 2 moles KI) = 0.228 moles PbI2

Next, we can use the molar mass of PbI2 to convert moles to grams:

0.228 moles PbI2 x 461.01 g/mol = 105.19 g PbI2

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Neomycin and Polymyxin B Sulfates and Hydrocortisone Otic Solution USP are a combination medicine. It is a prescription medication used to treat ear infections. It contains three active ingredients namely neomycin, polymyxin B sulfates, and hydrocortisone. The combination of these ingredients works together to relieve pain and treat the infection.

The antibiotic neomycin and polymyxin B work by destroying the bacteria that cause ear infections. Neomycin belongs to the class of antibiotics called aminoglycosides, and Polymyxin B belongs to the class of antibiotics called polymyxins. Hydrocortisone, on the other hand, is a corticosteroid used to reduce inflammation and pain in the ear.Neomycin, Polymyxin B Sulfates, and Hydrocortisone Otic Solution USP is used to treat bacterial infections that occur in the outer ear and ear canal. It is a prescription medication that is prescribed for adults and children who are above 6 years of age. The medication should not be used to treat viral or fungal infections. It should also not be used in patients with a perforated eardrum or those who are allergic to any of its ingredients.The medication should be used exactly as directed by the healthcare provider. The affected ear should be cleaned and dried before administering the medication. Then, gently shake the bottle and instill the drops into the ear canal. It is recommended to lie down for a few minutes to allow the medication to reach the infected area. Follow the healthcare provider's instructions for the duration of the medication. The medication should not be stopped early, even if the symptoms improve.

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Answer:

Transpiration

Then condensation

Then precipitation

and etc.

Answer: The water cycle?

Explanation: I hope this answer your question- Lily ^-^

We can determine the equilibrium concentration when we are given the initial concentration and reaction of an acid or base. In the given reaction,

HA is an acid that dissociates in water to form its conjugate base A− and a hydronium ion H3O+.

HA(aq) + H2O(l) ⇌ A−(aq) + H3O+(aq)

For any weak acid, the dissociation constant is defined as follows:

Ka = [A−][H3O+]/[HA]

We can determine the equilibrium concentration from the above formula by using the initial concentration.

Let’s consider a weak acid HA with an initial concentration of [HA]0.

It will form [A−] and [H3O+] at equilibrium.

If the degree of dissociation of the acid is x, then the concentration of [H3O+] at equilibrium will be [H3O+] = x, and the concentration of [A−] will be [A−] = x. And the concentration of [HA] at equilibrium will be [HA] = [HA]0 − x.

So, we can write the equilibrium expression for the dissociation of HA as:

Ka = [A−][H3O+]/[HA]Ka = x * x/([HA]0 − x)

By solving the above equation, we can obtain the value of x, which is the degree of dissociation of the acid.

At equilibrium, the equilibrium concentration of HA is [HA] = [HA]0 − x. The equilibrium concentration of A− is [A−] = x. The equilibrium concentration of H3O+ is [H3O+] = x. Thus, we can determine the equilibrium concentration from the initial concentration of a weak acid or base without using the equilibrium constant Kc.

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After evaluating perfect square binomial, the expression "(a + b)² = a² + b²" is False.

A numerical data is also referred to as a quantitative data and it can be defined as a data set that is primarily expressed in numbers only. This ultimately implies that, a numerical data refers to a data set consisting of numbers rather than words.

In Mathematics, there are six (6) common types of numbers and these include the following:

An integer can be defined as a whole number that may either be positive, negative, or zero.

Evaluating the given perfect square binomial, we have:

(a + b)² = (a + b)(a + b)

(a + b)² = a² + ab + ab + b²

(a + b)² = a² + 2ab + b² ≠ a² + b² (False).

Therefore, we can logically deduce that the expression "(a + b)² = a² + b²" is False.

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Complete Question:

True or False: For any two integers a and b, (a + b)² = a² + b²

Answer:

My name is Isaac Newton  and I am a scientist. I am known as one of the most important scientists in history. I was born in Woolsthorpe, England on January 4, 1643. My father, a farmer who was also named Isaac Newton, had died three months before my birth. My mother remarried when I was three years old and left me in the care of my grandparents.

Explanation:

Answer:

1) Big Bang Theory

2) we are in a phase of the big bang theory

Explanation:

So for number 1 the answer is the -big bang theory- and number 2 there is a theory that pretty much says that were in a constant cycle. what I mean is theoretically in a couple million years the entire universe will form together again into another dense ball and repeat the process. So basically the universe is still in the "expanding phase" and that's what backs up the theory of the big bang (the fact that were in one of the big bang theory's "phases")

True. It is okay to wash down the sides of the Erlenmeyer flask with DI water during the titration, even though you are diluting the acid present. This is because the amount of dilution from the wash down is usually negligible compared to the amount of acid present in the solution.

Additionally, any residual acid on the sides of the flask can affect the accuracy of the titration results, so it is important to wash it down to ensure accurate measurements.

During a titration, it is okay to wash down the sides of the Erlenmeyer flask with DI (deionized) water, even though you are diluting the acid present. This is because the volume of DI water added does not affect the overall number of moles of the acid present, and the goal of titration is to determine the concentration of the acid.

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When a cloud of gas is placed between a hot metal and a detector, the hot metal emits radiation, which passes through the gas cloud.

If a cloud of gas is placed between a hot metal and a detector, it can have different effects depending on the gas and the specific conditions. If the gas is dense enough and has high thermal conductivity, it can act as a heat sink and transfer some of the heat from the metal to the detector, resulting in a decrease in the temperature of the metal and an increase in the temperature of the detector. If the gas is transparent to the radiation emitted by the hot metal, then the detector may not detect any change in radiation. However, if the gas is not transparent to the radiation, it can absorb some of the radiation emitted by the hot metal, leading to a decrease in the amount of radiation detected by the detector. Additionally, the properties of the gas, such as its density, composition, and pressure, can affect the way it interacts with the hot metal and the detector. For example, if the gas is ionized, it can create an electric field that affects the behavior of the charged particles emitted by the hot metal.

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Answer:

Electronic configuration of nitrogen: K=2 L=5

Electronic configuration of phosphorus : K = 2 L = 8 M = 5

The element nitrogen will be more electronegative because of the smaller size of its atom. nitrogen accepts electrons more easily.

Explanation:

Explanation:

Nitrogen is more electronegative than phosphorus.

Reason :-

From top to bottom down a group, electronegativity decreases.

Explanation :-

Number of shell increases down a group, so there is an increased distance b/w the valence electrons and nucleus, or a greater atomic radius.‎ ‎

       Since nitrogen has a smaller atomic radius than phosphorus, the attraction of its nucleus towards the incoming electron is more than phosphorus. So , because of smaller atomic size nitrogen accepts electrons more easily.

molecules are often more than 1 of same element together in nature

like oxygen O is O2 is nature

in this assignment molecules are the number in front of the compound

so 3H20 means 3 molecules of H20 or water

compound are different elements together to make something else

al(oh)2

aluminum hydroxide or antacid

AL 1 O 2 H 2

total 5

molecule 1

Elements 3

3H2O

water

H 6 0 3

total 9

molecules 3

elements 2

NA2CO3

sodium carbonate or soda ash

NA 2 C 1 O 3

total 6

molecules 1

elements 3

one without a name is

FE2O3

iron oxide or rust

FE 2 O 3

total 5

molecules 2

elements 2

Co

C≡O

carbon dioxide

dangerous odorless gas

found in car & engine & generator & kitchen stove exhaust

dangerous because the human body can take it in its blood thinking it to be oxygen

C 1 O 1

total 2

molecules 1

elements 2

Mass of H₂ needed to react with O₂ : 1.092 g

The concentration of a substance can be expressed in several quantities such as moles, percent (%) weight / volume,), molarity, molality, parts per million (ppm) or mole fraction. The concentration shows the amount of solute in a unit of the amount of solvent.

Reaction

O₂(g) + 2H₂(g) → 2H₂O(g)

mass of O₂ : 8.75 g

mol O₂(MW=32 g/mol) :

\(\tt \dfrac{8.75}{32}=0.273\)

From the equation, mol ratio of O₂ : H₂ = 1 : 2, so mol H₂ :

\(\tt \dfrac{2}{1}\times 0.273=0.546\)

Mass H₂ (MW=2 g/mol) :

\(\tt 0.546\times 2=1.092~g\)

For reacting with 8.75 grams of oxygen, 1.08 grams of hydrogen is required.

The given balanced equation has been:

\(\rm O_2\;+\;2\;H_2\;\rightarrow\;H_2O\)

From the equation, 1 mole of oxygen reacts with 2 mole of hydrogen to give 1 mole of water.

The mass of oxygen has been: 8.75 g,

Moles = \(\rm \dfrac{weight}{molecular\;weight}\)

Moles of oxygen = \(\rm \dfrac{8.75}{32}\)

Moles of oxygen = 0.27 mol

Since,

1 mole Oxygen = 2 mole hydrogen

0.21 mol oxygen = 0.54 mol hydrogen

Mass of hydrogen = moles \(\times\) molecular weight

Mass of hydrogen = 0.54 \(\times\) 2

Mass of hydrogen = 1.08 grams.

Thus, for reacting with 8.75 grams of oxygen, 1.08 grams of hydrogen is required.

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If each bond is 0.123 nm long, the far from the oxygen atom is the center of mass of the molecule  is 6.7 × 10⁻³ nm.

The mass of the hydrogen = 1 amu

The mass of the oxygen = 16 amu

The distance y = 0.123 cos = 0.06 nm

The distance 0.123 sin 53 = 0.08 nm

r₁ = 0.06i+0.08j ,r₂  = 0.06i−0.08j, r₃ ==0

r = ( m₁r₁ + m₂r₂ + m₃r₃) / m₁ + m₂ + m₃

r = ( 1 (0.06i+0.08j + 0.06i−0.08j ) / 1 × 2 + 16

r =  (6.7 × 10⁻³ i )nm

Thus , the distance from the oxygen atom is the center of mass of molecule (6.7 × 10⁻³ i )nm.

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Answer:

B.) The sun is closer to Earth than any other star.

 Atmospheric pressure is the force exerted by the weight of the air molecules in the atmosphere. It is measured in millimeters of mercury (mm Hg) or in units of pressure such as pascals (Pa). The atmospheric pressure decreases with altitude, since there are fewer air molecules above a certain height.

The composition of the atmosphere also changes with altitude, since some gases are more easily dissolved or dispersed than others. Oxygen is one of the most important gases in the atmosphere, since it is necessary for respiration in most organisms. The percentage of oxygen in the atmosphere remains relatively constant at about 21% up to an altitude of about 10 km, after which it decreases gradually.

Given that the atmospheric pressure at the summit of a high mountain is 380 mm Hg and that the atmosphere is composed of 21% oxygen, we can calculate the partial pressure of oxygen at this altitude using the following formula:
Partial pressure of oxygen = Total pressure x Fraction of oxygen
where the fraction of oxygen is the percentage of oxygen divided by 100. Substituting the values given, we get:
Partial pressure of oxygen = 380 mm Hg x 0.21 = 79.8 mm Hg Therefore, the partial pressure of oxygen at the summit of a high mountain is about 79.8 mm Hg.
In conclusion, the correct answer to the question is: 80 mm Hg (rounded to the nearest whole number).

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Based on the given reaction, the bonds that are broken when performing the reaction are:

The correct option is C.

Atoms in compounds are joined by chemical bonds. Electrostatic interactions between negatively charged electrons and positively charged atomic nuclei result in bonds.

The number of bonds broken is determined from the balanced equation of the reaction as follows:

C₂H₄ + 3 O₂ ---> 2 CO₂ + 2 H₂O

Therefore, Four C-H, one C=C, and three O=0 bonds need to break up. Four C=O and four O-H bonds need to form.

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water into vapor is the answer

Answer:

liquid water turning into vapor

Explanation:

because physical changes alter only the size

Answer:

Option A. 52.00 amu

Explanation:

From the question given above, the following data were obtained:

Isotope A:

Mass of A = 49.946 amu

Abundance (A%) = 4.345%

Isotope B:

Mass of B = 51.941 amu

Abundance (B%) = 83.789%

Isotope C:

Mass of C = 52.941 amu

Abundance (C%) = 9.501%

Isotope D:

Mass of D = 53.939 amu

Abundance (D%) = 2.365%

Average atomic mass =.?

The average atomic mass of the unknown element can be obtained as follow:

Average atomic mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100] [(Mass of C × C%)/100] + [(Mass of D × D%)/100]

Average atomic mass = [(49.946 × 4.345)/100] + [(51.941 × 83.789)/100] + [(52.941 × 9.501)/100] + [(53.939 × 2.365)/100]

= 2.170 + 43.521 + 5.029 + 1.276

= 51.996 ≈ 52.00 amu

Therefore, the average atomic mass of the unknown element is 52.00 amu

The osmotic pressure inside the bacterial cell is approximately 11.73 atm.

a. To calculate the osmotic pressure inside the bacterial cell, we can use the equation:

Π = i * M * R * T

where Π is the osmotic pressure, i is the van't Hoff factor, M is the molar concentration of the solute, R is the ideal gas constant, and T is the temperature in Kelvin.

In this case, the concentration of sodium chloride is given as 15% (m/v), which means 15 grams of NaCl dissolved in 100 mL of solution. We need to convert this to molar concentration.

First, calculate the molar mass of NaCl:

Na: 22.99 g/mol

Cl: 35.45 g/mol

Molar mass of NaCl = 22.99 g/mol + 35.45 g/mol = 58.44 g/mol

Next, calculate the molar concentration:

15 g / 58.44 g/mol = 0.257 mol/L

Convert temperature to Kelvin:

30°C + 273.15 = 303.15 K

Now we can calculate the osmotic pressure:

Π = 1.9 * 0.257 mol/L * 0.0821 Latm/(molK) * 303.15 K = 11.73 atm

b. If an Escherichia coli cell, a non-halotolerant species of bacterium, is placed in a 15% NaCl solution, it will experience a hypertonic environment. This means that the concentration of solutes outside the cell is higher than inside the cell. Water will tend to move out of the cell, following the concentration gradient, in an attempt to equalize the solute concentrations.

As a result, the E. coli cell will undergo plasmolysis, which is the shrinking of the cell membrane away from the cell wall due to water loss. The high concentration of salt in the external environment causes water to leave the cell, leading to cellular dehydration and impairment of vital cellular functions. Ultimately, this can lead to cell death or significant damage to the cell's structure and function.

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The solution is the mixture of the solute into the solvent particles. In 60 mL solution, 59.8 mL of solvent is added.

Solute and solvent are the components of a solution. They react and mix together to produce a homogenous mixture. The solute is a substance that is added to the solvent.

Solvents are substances that dissolve the added solute in them to make a homogenous solution.

Given,

Volume of Solute = 0.20 mL

Volume of Solution = 60 mL

The volume of solvent is calculated as:

Volume of solvent = Volume of solution - Volume of solute

= 60- 0.20

= 59.8 mL.

Therefore, 59.8 mL of solvent is present in 60 mL of solution.

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The statement that is true about a chemical reaction at equilibrium is that the forward reaction rate is equal to the reverse reaction rate. (Option D)

At equilibrium, the rates of the forward and reverse reactions are equal, and the concentrations of the reactants and products remain constant over time. This means that the amounts of reactants and products do not necessarily need to be equal, but their concentrations are constant.

Option A and Option B are not true because at equilibrium, both the forward and reverse reactions are still occurring, and neither has reached completion.

Option C is also not necessarily true because the amounts of reactants and products may not be equal, but their concentrations are constant.

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