why do the reactions of the calvin cycle usually not occur at night?

Therefore, an infant weighing 14 lbs (6.4 kg) should be given 0.96 mL of the acetaminophen suspension.

Acetaminophen is the recommended over-the-counter drug for the treatment of fever and mild to moderate pain in infants. The drug is safe and effective when used according to the recommended dosage.

Acetaminophen suspension contains 80 mg/ 0.80 mL suspension.

The recommended dose is 15 mg/kg body weight.

Therefore, to calculate how much of the suspension should be given to an infant weighing 14 lbs (6.4 kg),

we need to perform the following calculations:

Calculate the dosage based on the infant's weight:

15 mg/kg x 6.4 kg = 96 mg

Determine how many milliliters of the suspension contain 96 mg:

80 mg/0.80 mL = 96 mg/x mL (cross-multiplication)80

x = 76.8 (solving for x)

x = 0.96 mL (rounded to two significant figures)

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Answer:

Explanation:

30+38

so this is the isosotope of Zn  that weighs 68

-so Zn68

Oxygen, Magnesium, Iron, and Silicon are the set of elements that makes up 95% of the Earth. Among these Oxygen is the most abundant element, comprising about 47% of the Earth's mass.

These four elements make up approximately 95% of the Earth's composition. Oxygen is the most abundant element, comprising about 47% of the Earth's mass. Magnesium, Iron, and Silicon are also significant constituents, with Magnesium accounting for about 27%, Iron for approximately 6%, and Silicon for around 8% of the Earth's composition.

While Carbon is indeed an essential element for life and is present in various forms on Earth, its abundance in the Earth's overall composition is relatively low compared to Oxygen, Magnesium, Iron, and Silicon. Hydrogen and Helium, mentioned in option D, are lighter elements and are more prevalent in the composition of the Sun and other celestial bodies, rather than the Earth itself.


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a) The 98% confidence interval for the true proportion of e-cigarette smokers between 15-17 years of age is approximately 4.93% to 10.27%.

b) The 95% confidence interval for the true mean of times young people smoke e-cigarettes a week is approximately 7.45 hours to 8.55 hours.

c) The 98% confidence interval for the true mean of times young people smoke e-cigarettes a week, considering a known population standard deviation of 2.05 hours, is approximately 7.78 hours to 8.22 hours.

a) To construct the confidence interval for the true proportion of e-cigarette smokers, we can use the sample proportion, standard deviation, and the desired confidence level. With a sample proportion of 7.6% and a standard deviation of 2.7, we can calculate the standard error as the square root of (sample proportion * (1 - sample proportion) / sample size). Using the formula for a confidence interval, we find the margin of error by multiplying the standard error by the critical value corresponding to the desired confidence level (in this case, 98%). The margin of error is then added and subtracted from the sample proportion to obtain the lower and upper bounds of the confidence interval.

b) For constructing the confidence interval for the true mean of times young people smoke e-cigarettes a week, we use the sample mean, standard deviation, and the desired confidence level. With a sample mean of 8 hours and a standard deviation of 1.5 hours, we can calculate the standard error as the standard deviation divided by the square root of the sample size. Applying the formula for a confidence interval, the margin of error is obtained by multiplying the standard error by the critical value corresponding to the desired confidence level (95%). The margin of error is then added and subtracted from the sample mean to determine the lower and upper bounds of the confidence interval.

c) In this case, since the population standard deviation is known, we can use it instead of the sample standard deviation to construct the confidence interval. With a known population standard deviation of 2.05 hours, we can calculate the standard error using the population standard deviation divided by the square root of the sample size. Following the formula for a confidence interval, the margin of error is obtained by multiplying the standard error by the critical value corresponding to the desired confidence level (98%). The margin of error is added and subtracted from the sample mean to establish the lower and upper bounds of the confidence interval.

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Answer:

It’s 150 C :)

Explanation:

Answer:

Newton's first law of motion is explained in the below statements

What is Newton's first law of motion?

Newton's first law asserts that if a body is at rest or travelling at a constant speed in a straight line, it will remain at rest or continue to move in a straight path at a constant speed until acted on by a force.

Explanation:

Some examples of Newton's first law are:

1. A rock at rest: Unless pushed by nature or by another force, a rock sitting on the ground will remain there for thousands of years. It will not be dispersed in various locations.

2. The sudden application of breaks in a vehicle: When a driver suddenly uses the brakes, we tend to move forward. The vehicle comes to a halt as a result of the brakes. However, we are moving due to inertia. That is why seat belts are essential for road safety. 

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You need to add 2.12 g of \(CH_3COONa\) to create a buffer with pH.

What is The Henderson-Hasselbalch equation?

The Henderson-Hasselbalch equation, which reads pH = pKa + log([A-]/[HA]), must be used to construct a buffer. Acetic acid (\(CH_3COOH\)) has a pKa of 4.761. The solution has a \(CH_3COOH\) concentration of 0.100 M and a volume of 300 ml, which is equivalent to 0.300 L. Therefore, (0.100 M) x (0.300 L) = 0.030 mol of \(CH_3COOH\) are present in the solution. We must utilize the equation for Ka, Ka = [H+][A-]/[HA], to get the number of moles of \(CH_3COO-\). This equation may be rearranged to produce [A-] = (Ka x [HA])/[H+]. Acetic acid has a Ka value of 1.8 x 10-52. By applying the Henderson-Hasselbalch equation, which reads pH = pKa + log([A-]/[HA]), one may determine the pH of a buffer solution. In order to rewrite this equation to get [A-]/[HA] = antilog(pH - pKa), we need to make a buffer with pH. [A-]/[HA] = antilog(4.74 - 4.76) = antilog(-0.02) = 0.87 is the result of substituting values.

[A-] = [HA] x [A-]/[HA] may be used to calculate how many moles of \(CH_3COO-\) are needed. When values are substituted, [A-] equals (0.030 mol) x (0.87) = 0.026 mol.\(CH_3COONa\) has a molecular weight of 82 g/mol3.
Therefore, using the formula mass = a number of moles x molecular weight,
it is possible to determine the amount of \(CH_3COONa\) needed: mass = (0.026 mol) x (82 g/mol) = 2.12 g.

Therefore, you need to add 2.12 g of \(CH_3COONa\) to create a buffer with pH.

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Answer : Music is read differently in the brain than

nonmusical tones and is connected to many different areas of the brain. Learning music

relegates a larger part of the brain to recognizing and interpreting music. Listening to

music has also been found to have an effect on learning.

Answer:

The heart would listen to music with a nice rhythm as it beats to the song.

Explanation:

A covalent bond will be formed when two atoms are each trying to take each others electrons. Option A

A covalent bond is a type of chemical bond that involves the sharing of electrons between atoms. In a covalent bond, two or more atoms share one or more pairs of electrons to achieve a more stable electron configuration.

The strength of a covalent bond depends on a variety of factors, including the number of shared electrons, the distance between the atoms, and the electronegativity of the atoms involved. Covalent bonds are very strong, and they play a crucial role in the formation of molecules and compounds in chemistry.

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The wave which is created by causing vibrations in particles of matter is a mechanical wave.

A wave is a disturbance in a medium which transmits transmits energy from one point to another without a permanent displacement of the particles of the medium.

Types of waves include:

Mechanical waves are waves which are produced as a result of the vibrations of the particles of the medium.

Therefore, the wave which is created by causing vibrations in particles of matter is a mechanical wave.

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Answer:

Intermolecular force for oil the dipole-dipole.

Intermolecular force for water hydrogen bonds.

Intermolecular force for vegetable oil nonpolar compound.

Intermolecular force for corn syrup fructose.  

Answer:

Hydrogen?

Explanation:

I'm probably wrong but I hope it helps

Answer:hydrogen

Explanation:

a) To find the stopping potential, we can use the formula:

K_max = eV_s

where K_max is the maximum kinetic energy of the ejected electrons, e is the charge on an electron, and V_s is the stopping potential. We can use the fact that the energy of a photon of light is given by:

E = hc/λ

where h is Planck's constant, c is the speed of light in a vacuum, and λ is the wavelength of the light. The work function, W, is the minimum energy required to eject an electron, and is related to the threshold frequency, f_0, by:

W = hf_0 = hc/λ_0

where λ_0 is the threshold wavelength.

For potassium, the work function is given as 2.3 eV. We can convert this to joules using:

1 eV = 1.60×10^-19 J

so W = 2.3 eV x 1.60×10^-19 J/eV = 3.68×10^-19 J.

The threshold wavelength, λ_0, can be found by rearranging the formula for the energy of a photon:

λ_0 = hc/W = (6.63×10^-34 J⋅s x 3.00×10^8 m/s)/(3.68×10^-19 J) = 5.39×10^-7 m

The threshold frequency, f_0, can be found using the formula:

f_0 = c/λ_0 = 3.00×10^8 m/s / 5.39×10^-7 m = 5.57×10^14 Hz

Now we can find the energy of a photon with wavelength λ = 210 nm = 210×10^-9 m:

E = hc/λ = (6.63×10^-34 J⋅s x 3.00×10^8 m/s)/(210×10^-9 m) = 2.99 eV

To find the stopping potential, we subtract the work function from the energy of the photon:

V_s = (E - W)/e = (2.99 eV - 3.68×10^-19 J)/(1.60×10^-19 C) = -0.425 V

Rounding to two significant figures, we get:

Stopping potential = -0.43 V

b) The kinetic energy of the most energetic electrons ejected is given by:

K_max = E - W = 2.99 eV - 2.3 eV = 0.69 eV

Converting to joules, we get:

K_max = 0.69 eV x 1.60×10^-19 J/eV = 1.10×10^-19 J

c) The speed of the electrons can be found using the formula:

K_max = 1/2 mv^2

where m is the mass of an electron and v is its speed. Solving for v, we get:

v = √(2K_max/m)

The mass of an electron is 9.11×10^-31 kg, so:

v = √(2(1.10×10^-19 J)/(9.11×10^-31 kg)) = 6.61×10^5 m/s

Rounding to two significant figures, we get:

Speed of electrons = 6.6×10^5 m/s

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The researcher will require 187.66 grammes of Na3PO4 to create a 325 ml solution with a Na ion concentration of 1.40 M.

We must take the molar concentration and volume of the desired solution into account in order to calculate the required amount of Na3PO4.

1.40 M, or 1.40 moles of Na ions per litre of solution, is the value for the molar concentration, or M. Since 325 ml (0.325 L) is required, we may determine how many moles of Na ions are required:

Molar concentration times volume equals the number of moles. For example, 1.40 mol/L times 0.325 L equals 0.455 mol

The chemical structure of tribasic sodium phosphate (Na3PO4) must therefore be taken into account. According to the formula, there are 3 moles of Na ions for every mole of Na3PO4.

As a result, one-third as many moles of Na3PO4 are required as there are of Na ions:

The formula for Na3PO4's moles is 0.455 mol / 3 = 0.1517 mol.

Finally, we may use the molar mass of Na3PO4 to determine the required mass. Na3PO4 has a molar mass of approximately 163.94 g/mol:

Mass equals moles times molar mass.

Mass = 163.94 g/mol x 0.1517 mol, or 24.86 g

As a result, the researcher will require about 24.86 grammes of Na3PO4 to make a 325 ml solution with a 1.40 M concentration of Na ions.

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Explanation:

There are several pieces of evidence that can be used to identify chemical changes, other than a change in color. Some of these include the production of a gas, the formation of a precipitate, a change in temperature, and a change in the state of matter (e.g. from a solid to a liquid or vice versa). For example, if a solid substance is added to a liquid and bubbles of gas are produced, this is evidence of a chemical change. Similarly, if two clear solutions are mixed together and a solid precipitate forms, this is also evidence of a chemical change. Additionally, if a substance is heated and it changes from a solid to a liquid or from a liquid to a gas, this is also evidence of a chemical change.

option (B) KOH is the correct answer

KOH is the substance that, when added to the solution, is most likely to raise the pH .

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Answer:

0.3kg/min

Explanation:

The formula for acceleration is a = f/m where f = force and m = mass.

a = 3/10

a = 0.3

Best of Luck

Answer:

db gb bg    

Explanation:

Option D, NaCl(aq) + AgNO3(aq) → NaNO3(aq) + AgCl(s), is the balanced chemical equation that represents a single-replacement reaction.

What is Replacement Reaction?

In chemistry, a replacement reaction is a type of chemical reaction where one element replaces another in a compound. The general formula for a replacement reaction is:

A + BX → AX + B

where A and B are elements, and X is an anion that can combine with A and B. In this reaction, A replaces B in the compound BX, forming a new compound AX and releasing the element B as a free element. Replacement reactions can be of two types: single replacement reactions and double replacement reactions, depending on whether one or two elements are replaced in the reaction.

In this reaction, sodium (Na) replaces silver (Ag) in the compound AgNO3 to form NaNO3, and silver is released as a free element in the form of AgCl.

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Answer:

I classify the following examples as Endothermic

Answer:

a

Explanation:

The mass of magnesium chloride produced is 392 g if we start with 100.g of magnesium.

The quantity of matter present in an object is determined by its mass, which is a fundamental attribute of matter. It is a scalar quantity and is denoted by the letters g or kg (kg). Weight, which is the force of gravity acting on an object and which varies depending on the gravitational field, is distinct from mass.

The reaction's chemically balanced equation is as follows:

Mg + 2HCl → MgCl₂ + H₂

This demonstrates that when one mole of magnesium (Mg) is combined with two moles of hydrochloric acid (HCl), one mole of magnesium chloride (MgCl2) and one mole of hydrogen gas (H2) are produced.

We need to know how many moles of magnesium there are in 100.0 g of magnesium in order to determine the mass of magnesium chloride produced. Magnesium has a molar mass of 24.31 g/mol, therefore

moles of Mg =  mass of Mg / molar mass of Mg

Moles of magnesium = 100.0 g / 24.31 g/mol.

Moles of Mg = 4.11 mol.

One mole of magnesium interacts to create one mole of magnesium chloride, according to the balanced equation. As a result, 4.11 moles of magnesium chloride were also created.

Magnesium chloride has a molar mass of 95.21 g/mol. Hence, the amount of magnesium chloride that is created is:

Mass of MgCl2 =  moles of MgCl2 x  molar mass of MgCl2

Mass of MgCl2= 4.11 mol x 95.21 g/mol

Mass of MgCl2 = 392 g.

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This statement is True because Litmus paper often turns red below pH 4.5 and blue over pH 8.3. When the paper turns purple, the pH is almost neutral. The sample is an acid if the red paper stays that color.

The scale went from 0 (the very acid) to 14 (the very basic) (the most basic). The pH scale above shows that fresh water does indeed have a pH of 7. This value is regarded as neutral because it neither exhibits acidity nor basicity. Typically, pure rain has a pH between 5.0 and 5.5, which is moderately acidic.

The pH of a solution is a key marker of its chemical make-up. The pH can have an effect on body processes that take place, the behavior of bacteria, and the behavior of chemicals. Medicine, nutrition, emotions, and lifestyle habits can all disturb the homeostasis. Hazardous bacteria can grow more easily in environments with high pH levels.

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Combining 2 grams of copper and 4 grams of sulfur to make 6 grams of copper sulfate. Hence, option D is correct.

The Law of Conservation of Mass states that matter cannot be created or destroyed in chemical reactions.

It posits that the mass of a substance remains unchanged after undergoing a chemical process.

Therefore, according to the question, the procedure that best demonstrates the law of conservation of mass after the chemistry student conducted different procedures is option D.

This is because the mass of copper and sulfate did not change but merely combined to form a compound.

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The alkene that would give only a ketone with three carbons as a product of oxidative cleavage is propene.

Oxidative cleavage of alkenes involves the breaking of the double bond and the addition of oxygen to form two carbonyl groups. The product formed depends on the position of the double bond and the number of carbon atoms on either side of it.

When propene undergoes oxidative cleavage, it forms a ketone with three carbons, namely acetone, as the only product. This is because propene has a double bond between the second and third carbon atoms, and upon cleavage, it forms two carbonyl groups, one on each end of the double bond, resulting in acetone with three carbons.

In contrast, alkenes with four or more carbon atoms will form a mixture of ketones and aldehydes upon oxidative cleavage.

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Answer:

A

Explanation:

Nitrogen is a reactive nonmetal. That leaves A or C, neon is a noble gas, the rest make sense too. Magnesium is an alkaline earth metal. silicon is a metalloid.

The element nitrogen is a non metal  in 15th group, neon is a noble gas in 18th group and magnesium is metal and silicon is a metalloid. Hence, option A is correct.

In periodic table, the electropositive elements are called metals. They are located in the very left side and middle of the table. Thus metals are located in the s- block and d- block of periodic table.

From group 13 to 18 elements are broadly classified as non-metals. Group 18 represent the noble gases such as neon. Some elements shows the properties of both metals and  non metals an they are called metalloids. Silicon , germanium etc. are metalloids.

Therefore, the element nitrogen is a non metal neon is a noble gas and magnesium is metal and silicon is a metalloid. Hence, option A is correct.

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Answer:

phosphorus

Explanation:

hope this helps make brainliest and thanks it also 5 stars

have a good day

The element having 16 neutrons in group 15 for the periodic table is phosphorus. Also known as the nitrogen family, group 15 is.

Each of the chemical substances that make up Group 15 (Va) in the periodic table of elements belong to the nitrogen group. Nitrogen (N), phosphorous (P), arsenic (As), arsenic (Sb), bismuth (Bi), plus moscovium (Mc) make up the group. While chemically distinct from one another, the elements exhibit certain basic commonalities in their behaviour, and these similarities are a result of the shared characteristics of their atoms' electronic structures. The element having 16 neutrons in group 15 for the periodic table is phosphorus. Also known as the nitrogen family, group 15 is.

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