Convert 714 years to min using Dimensional Analysis

Answer:

C. the particles of a gas collide with each other and with other objects

The percent by mass of acetic acid in the vinegar is 2.33%.

Below are the steps to solve the given problem using the data table given below:

Step 1: Calculate the mass of the vinegar. Given,Mass of flask and vinegar solution- 25.17gMass of flask- 15.12gMass of vinegar solution = Mass of flask and vinegar solution - Mass of flask= 25.17 g - 15.12 g= 10.05 g

Step 2: Calculate the moles of NaOH used in the titration.Molarity of NaOH solution is 0.1 M.Moles of NaOH = Molarity × Volume of NaOH usedMoles of NaOH = 0.1 M × 39.00 mL (since the initial volume of NaOH is 0.00 mL)Moles of NaOH = 0.0039 moles

Step 3: Determine the moles of acetic acid used in the reaction.The balanced chemical equation for the reaction between NaOH and acetic acid (the main component of vinegar) is given below:CH3COOH + NaOH → CH3COONa + H2OMoles of NaOH = Moles of CH3COOH (since they react in a 1:1 ratio)Moles of CH3COOH = 0.0039 moles

Step 4: Calculate the mass of acetic acid used in the reaction.Molar mass of acetic acid is 60.05 g/mol.Mass of CH3COOH = Moles of CH3COOH × Molar mass of CH3COOH= 0.0039 moles × 60.05 g/mol= 0.234 gStep 5: Calculate the percent by mass of acetic acid in the vinegar.Percent by mass of acetic acid = (Mass of CH3COOH / Mass of vinegar solution) × 100%= (0.234 g / 10.05 g) × 100%= 2.33%.

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From the calculation, the pH of the solution after dilution is 3.

The pH is the hydrogen ion concentration of the solution. Now we know that;

C1 =  0.010 m

V1 = 10.0 ml

V2 = 10.0 ml + 100.0 ml = 110 ml

C2 = ?

C1V1 = C2V2

C2 = C1V1 /V2

C2 =  0.010 m  * 10.0 ml / 110 ml

C2 = 0.00091 M

pH = -log[0.00091 M]

pH = 3

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The final dilution is 1 part sample to 27 parts water, or a dilution of 1:27.

The final dilution can be calculated by multiplying the individual dilution factors. In this case, each dilution has a dilution factor of 1:3 (1 part sample to 3 parts water).

Since there were 3 consecutive serial dilutions done at the same dilution, the dilution factor will be raised to the power of 3.

The dilution factor for each individual dilution is:

1:3

To calculate the final dilution factor, we raise the dilution factor to the power of 3:

(1:3)^3 = 1:27

Therefore, the final dilution is 1 part sample to 27 parts water, or a dilution of 1:27.

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When drawing the Lewis structure of a molecule, start by determining the total number of available valence electrons based on each element's group number. Then, use the total number of electrons needed for each element to be stable, generally based on its charge, to determine the ionic charge by finding the difference between the number of needed and available electrons divided by two.

For example, for a neutral oxygen atom in Group 6A or 16, it has six valence electrons. To achieve a stable octet, it needs two more electrons, which makes its ionic charge -2. Similarly, a nitrogen atom in Group 5A or 15 has five valence electrons, and it needs three more electrons to achieve a stable octet, which makes its ionic charge -3.

Once you have determined the ionic charges for each element in the molecule, you can start constructing the Lewis structure by placing the atoms in a way that satisfies the octet rule, where each atom (except hydrogen) has eight electrons in its outermost shell

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Answer:

The magnitude of the threat to the ecosystem is linked to human population size and resource use per person. Resource use, waste production and environmental degradation are accelerated by population growth.

when solid potassium chlorate is heated, solid potassium chloride and oxygen gas are produced. The reaction is given as: 2KClO₃(s) → 2KCl(s) + 3O₂(g)

Step 1: Data given

Solid potassium chlorate = KClO₃(s)

solid potassium chloride = KCl

oxygen gas = O₂

Step 2: The balanced equation

KClO₃(s) → KCl + O₂

On the left side we have 3x O, on the right side we have 2x O

To balance the amount of Oxygen we have to multiply KClO₃ (on the left side) by 2 and multiply O₂ on the right side by 3

2KClO₃(s) → KCl(s) + 3O₂(g)

On the left we have 2x K, on the right we have 1x K.

To balanced the amount of K we have to multiply KCl on the right side by 2

Now the equation is balanced

2KClO₃(s) → 2KCl(s) + 3O₂(g)

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To solve this problem, we can use the formula for work done by gas at constant pressure:

W = -PΔV

Where W is the work done, P is the constant pressure, and ΔV is the change in volume. Since the pressure is constant, we can rearrange this formula to solve for ΔV:

ΔV = -W/P

Plugging in the given values, we get:

ΔV = -(136.9 J)/(783 Torr)

We need to convert Torr to SI units of pressure, which is in Pascals (Pa). 1 Torr is equal to 133.32 Pa, so:

ΔV = -(136.9 J)/(783 x 133.32 Pa)
ΔV = -0.00155 m^3

The negative sign indicates that the gas has expanded, so the final volume will be the initial volume plus the change in volume:

V_final = V_initial + ΔV
V_final = 66.8 mL + (-0.00155 m^3)

We need to convert mL to m^3:

V_final = 0.0668 L + (-0.00155 m^3)
V_final = 0.06525 m^3

Therefore, the final volume of the gas is 0.06525 m^3.

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From the given vectors, neither v nor w are solutions to Ax = 0.

To determine if the given vectors are also solutions to the homogeneous system Ax = 0, we need to check if multiplying each vector by the matrix A results in the zero vector.

Given vectors:

v = ⎡⎣⎢⎢⎢101⎤⎦⎥⎥⎥ and w = ⎡⎣⎢⎢⎢020⎤⎦⎥⎥⎥

Matrix A:

A = ⎡⎣⎢⎢⎢103⎤⎦⎥⎥⎥

Let's calculate Av and Aw:

Av = ⎡⎣⎢⎢⎢103⎤⎦⎥⎥⎥ ⎡⎣⎢⎢⎢101⎤⎦⎥⎥⎥ = ⎡⎣⎢⎢⎢11+00+3*1⎤⎦⎥⎥⎥ = ⎡⎣⎢⎢⎢4⎤⎦⎥⎥⎥ ≠ 0

Aw = ⎡⎣⎢⎢⎢103⎤⎦⎥⎥⎥ ⎡⎣⎢⎢⎢020⎤⎦⎥⎥⎥ = ⎡⎣⎢⎢⎢01+20+0*3⎤⎦⎥⎥⎥ = ⎡⎣⎢⎢⎢0⎤⎦⎥⎥⎥ ≠ 0

Both Av and Aw are not equal to 0, which means that neither v nor w are solutions to the homogeneous system Ax = 0.

Therefore, neither v nor w are solutions to Ax = 0.

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Answer:

Its (b)

Explanation:

After studying abroad in boston, I have discovered everything that there is to know about chemistry, and I have come to the conclusion that B is the correct answer.

\(CICH_2C=CCH_2CH(CI)_2\) the correct structure that corresponds 1,5,5-trichloro-2-pentyne. Hence, option B is correct.

The parent name of the alkyne comes from the IUPAC name for the alkane of the same number of carbon atoms, except the ‐ ane ending is changed to ‐ yne to signify the presence of a triple bond.

\(CICH_2C=CCH_2CH(CI)_2\)  the correct structure that corresponds 1,5,5-trichloro-2-pentyne.

Hence, option B is correct.

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The atomic radius decreases as you move across a period (from left to right) because the number of protons increases and pulls the electrons in closer to the nucleus.

Atomic radius is the distance from the nucleus of an atom to the outermost electrons. The atomic radius decreases as you move from left to right in a period. This decrease is due to the increase in the nuclear charge and the shielding effect. Electrons are attracted to the positive charge of the nucleus but are also repelled by the other electrons in the atom. The shielding effect occurs when the inner electrons shield the outer electrons from the nuclear charge.This results in a smaller atomic radius.

As the number of protons increases, the nucleus becomes more positively charged, which attracts the electrons more strongly. The electrons are pulled in closer to the nucleus, making the atomic radius smaller. Therefore, option b, The number of protons increases and pulls the electrons in closer to the nucleus is correct.

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Absorption is the movement of breakdown products of food from the lumen of the small intestine into the blood or lymph.

The digestive system breaks down the food into their smaller components. The digestive system consists of the stomach, intestines, liver, pancreas, mouth, esophagus, etc. After food is broken down into smaller monomers, it is absorbed by blood and lymph. This process is called absorption. Most of the absorption occurs through the linings of the small intestines, but some of it occurs in the mouth (starch is absorbed here), the stomach (alcohol, some fats and proteins are absorbed here), and the large intestine (water, vitamins, and minerals). Thus, absorption is correct answer for this question.

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Complete question:

____Is the movement of breakdown products of food from the lumen of the small intestine into the blood or lymph?

a. Propulsion

b. Ingestion

c. Chemical digestion

d. Defecation

e. Absorption

Alpha-linolenic acid (ALA) is an essential omega-3 fatty acid that is found in certain plant oils, such as flaxseed and canola oil, and in some nuts and seeds. It is considered an essential fatty acid because the body cannot produce it and it must be obtained through the diet.

Eicosapentaenoic acid (EPA) is a biologically available form of omega-3 fatty acid that can be produced from ALA through a series of metabolic processes. The percentage of ALA that converts to EPA in the body varies depending on a number of factors, such as individual genetics, dietary factors, and overall health.

On average, the conversion rate of ALA to EPA is relatively low, with estimates ranging from 0.1-9% in healthy adults. The exact percentage of conversion is not well-established, but it is believed to be low due to the limited activity of the enzymes involved in the conversion process.

It's also important to note that not all of the EPA produced from ALA will be used by the body, as some of it will be converted to other fatty acids such as docosahexaenoic acid (DHA). The conversion rate of ALA to DHA is even lower, typically less than 0.5%.

It's important to note that some studies show that supplementation with EPA and DHA may be more beneficial for some health outcomes than supplementing with ALA, as these forms of omega-3 are more easily incorporated into cell membranes and have a more direct effect on the body.

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Answer:

V = nRT/P

Explanation:

The ideal gas law states that

PV=nRT

where P = pressure, V = volume, n = number of moles, R = ideal gas constant, and T= temperature

P V = n R T

to get V on its own, divide both sides of the equation by P

V = (nRT)/P

The color of the flame emitted by known compounds can be used to help identify the metallic ion present in an unknown solid. Different metallic ions produce different flame colors when they come into contact with a flame.

Metal ions in unknown substances can be identified through flame tests thanks to their distinctive emission spectra.

The metallic ion contained in an unknown material can be determined using the color of the flame produced by known compounds.

When in contact with a flame, different metal ions produce distinct flame colors: sodium creates a yellow flame, whereas potassium creates a violet flame.

The presence of a metallic ion can be determined by contrasting the flame colors of the known compounds with the flame of the unknown solid.

A spectroscope must be used to evaluate the flame in order to precisely identify the metal ions contained in an unidentified substance. This can lead to a more precise identification and a more thorough investigation of the emission spectra.

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Answer:

even though the particles of a liquid are moving, they are attracted to each other so they don't spread far apart to become a gas.

Explanation:

"but some do when they evaporate"

In liquids, the particles are allowed to move freely rather than the solid. The gaseous particles can move more freely than liquids.

In liquids, the particles are placed randomly and thus are allowed to move freely but they do not become a gas as liquids are slightly less compressible than gases.  Even though the particles of a liquid are moving, they are attracted to each other so they don't just spread far apart to become a gas.

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Answer:

it has  a huge surface-to-volume ratio, very high porosity and completely different physiochemical properties.

Explanation:

idk if the answer is good  !

sorry

Answer:

The given hydrocarbon is Glycerol

The empirical formula of the compound is BN₄.

To determine the empirical formula of the compound, we need to find the ratio of atoms in the compound.

Crystal structure; The nitrogen ions are arranged in a ccp pattern, and the boron ions occupy half of the tetrahedral holes.

  N       N       N       N

    B       B       B       B

  N       N       N       N

    B       B       B       B

  N       N       N       N

    B       B       B       B

  N       N       N       N

    B       B       B       B

  N       N       N       N

    B       B       B       B

  N       N       N       N

    B       B       B       B

  N       N       N       N

    B       B       B       B

Number of nitrogen ions; Since the nitrogen ions are arranged in a ccp pattern, each corner atom is shared among eight unit cells, and each face atom is shared among four unit cells. Therefore, the number of nitrogen ions in one unit cell is;

Number of corner atoms = 1/8 x 8 = 1

Number of face atoms = 1/2 x 6 = 3

Total number of nitrogen ions in one unit cell = 1 + 3 = 4

Determine the number of boron ions; Since the boron ions occupy half of the tetrahedral holes, there are two tetrahedral holes per unit cell, and each hole is shared among four unit cells. Therefore, the number of boron ions in one unit cell is;

Total number of tetrahedral holes in one unit cell = 2

Number of boron ions = 1/2 x 2 = 1

The ratio of nitrogen to boron atoms is 4:1.

Therefore, the empirical formula of the compound is BN₄.

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Answer:

Answer is C,

Explanation:

It diminished local resources, decreasing the population.

The final volume of the reconstituted cefazolin solution is 4 mL.  The volume of the cefazolin powder is 0.6 mL. The final volume of the 100 mg/mL cefazolin solution is 10 mL.

The packaging insert instructs to add 3.4 mL of sterile water without bacteriostat to the 1-g vial of cefazolin. This results in a reconstituted solution with a concentration of 250 mg/mL.

To find the final volume, we can set up the equation:

Concentration of reconstituted solution = Amount of drug / Final volume

Using the given concentration (250 mg/mL) and the amount of drug (1 g = 1000 mg), we can rearrange the equation to find the final volume:

250 mg/mL = 1000 mg / Final volume

Solving for the final volume:

Final volume = 1000 mg / 250 mg/mL = 4 mL

Therefore, the final volume of the reconstituted cefazolin solution is 4 mL.

To find the volume of the cefazolin powder, we need to subtract the volume of sterile water added from the final volume of the reconstituted solution.

Given that 3.4 mL of sterile water is added to the vial, and the final volume of the reconstituted solution is 4 mL, we can calculate the volume of the cefazolin powder as follows:

Volume of cefazolin powder = Final volume - Volume of sterile water added

Volume of cefazolin powder = 4 mL - 3.4 mL = 0.6 mL

Therefore, the volume of the cefazolin powder is 0.6 mL.

To determine the final volume of the 100 mg/mL cefazolin solution, we can use the concentration and the amount of drug.

We are given that the resulting concentration after reconstitution should be 100 mg/mL. Considering the amount of drug is 1 g (1000 mg), we can set up the following equation:

Concentration of reconstituted solution = Amount of drug / Final volume

Using the given concentration (100 mg/mL) and the amount of drug (1000 mg), we can rearrange the equation to find the final volume:

100 mg/mL = 1000 mg / Final volume

Solving for the final volume:

Final volume = 1000 mg / 100 mg/mL

Final volume = 10 mL

Therefore, the final volume of the 100 mg/mL cefazolin solution is 10 mL.

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The statements that describe the electron sea model are;

Electrons all have approximately the same energy.

Electrons move freely among atoms (delocalized).

We know that there are several models that can be used for the determination of the movement of the electrons in the atom. In the electron sea model, we are saying that the electrons are quite free to move freely from one atom to the another and they are not attached to any particular atom.

We have to know that the electrons are known to occur in specific energy levels. The electrons must only be found in the energy level that corresponds to that particular electrons. This also means that the electrons that are in the electron sea must all be of the same energy.

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Missing parts;

Which statements describe the electron sea model? Check all that apply. Electrons all have approximately the same energy. Electrons move among orbitals of different energies. Electrons move freely among atoms (delocalized).

The element that has the lowest first ionization energy is Fr that is francium.

The ionization energy is the measure of the capability of the element to enter into the chemical reactions that requiring the ion formation or the donation of the electrons. It is the  measure of the tendency in removing the electron from an atom or the ion.  The loss of the electron usually occurs in the ground state of a chemical species. The ionization energy will decreases from top to the bottom in groups, and will increases from the left to the right across a period.

Thus, the Fr element has the lowest first ionization energy.

This question is incomplete , the complete question is :

What element has the lowest first ionization energy? (F), (Li), (Fr), (Rb)?

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Answer:

ORANGE WAIT NO IM COLOR BLIND

Explanation:

Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore, because of the evaporation of upper surface of liquid, volume decreases.

Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.

Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.

The volume of Substance 1 change from 3 liters of liquid to just over 0.50 liters after it was boiled and then cooled because on heating the molecules on the upper surface of liquid evaporates.

Therefore, because of the evaporation of upper surface of liquid, volume decreases.

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Answer:

Lion and cheetah - Competition

Mistletoe on a tree - Parasitism

Coyote eating rabbit- Predatation

Remora and Shark - Mutualism

Clownfish and Anemone - Relationship

Explanation:

Answer:

beryllium has a higher ionization energy because its radius is smaller. boron has a higher ionization energy because its radius is smaller.

Energy flows from the plankton to a number of other organisms when the plankton are eaten.

If all the plankton decreased it would increase the levels of carbon in our air, which would not only make climate change, but also make it difficult for humans to breathe.

What is plankton?

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