When the chemical equation Na + S → Na2S is correctly balanced, the proper sequence of coefficients is

a. 1,2,2

b. 2,1,2

c. 2,1,2

d. no correct response

Answer:

conductivity in solid state/ in water

Explanation:

conducitvity in water state would be least helpful when trying to determine the bond type that has the strongest intermolecule force, becuase they (salt and water) both would dissolve in water the same.

The property that will be least helpful in the determination of the bond type that has the strongest intermolecular forces is C. Conductivity in water.

It should be noted that the students wanted to investigate whether ionic or covalent bonds have stronger intermolecular forces.

In order to carry out the investigation, salt, sugar, and molar balls are used. Based on this, the property that is required for the investigation will be flammability, solubility in water, and the melting point.

The conductivity in water isn't required.

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Answer:

1. C

2. B

3. B

4. Graph b, option D

Explanation:

Answer:

11. chloroplasts and a cell wall

17. microbes

1. increased

2. Graph b

Explanation:

I put them in the order u asked the questions btw.

The binding energy in MeV per atom is - 63284.56 Mev.

The amount of energy needed to detach a particle from a system of particles or to disperse every particle in the system is known as the binding energy. Subatomic particles in atomic nuclei, electrons attached to atom's nuclei, and atoms and ions bonded together in crystals are three examples of where binding energy is very relevant.

If we have a nucleus with Z protons and N neutrons and mass MA, where A = Z + N then its binding energy in MeV is given by: Eb(MeV) = (Zmp + Nmn - MA) x 931.494 MeV/u

Mass of atom = 69.955264 amu

Mass of proton = 1.007825 amu

Mass of neutron = 1.008665 amu

Binding energy, Mev = (Zmp + Nmn - M) × 931.494MeV/u

                                    = ( 1.007825 + 1.008665 -  69.955264) × 931.494

                                    = - 67.938774 × 931.494

                                    = - 63284.56 Mev

Therefore, the binding energy in MeV per atom is - 63284.56 Mev.

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Answer:

CO2 I believe

Explanation:

It doesn't have any hydrogen

Answer:

because they are saturated

Answer: when water is evaporated from the earth whether that be from bodies of water or plants, when it goes up higher, the temperature drops, causing the water droplets to condense, which means form water. This creates clouds and when the clouds get too big and full, precipitation (rain) happens and the rain falls to the earth. This cycle is then repeated.

Explanation:

Answer:

33 minutes

Explanation:

60 km/h = 37.28 mi/h

20/37.28 = 0.5364 h

0.5364 * 60 min = 32.2 minutes

Answer:alcohol

Explanation:

The half-life of a radioisotope if 25.0 grams of an original 200. -gram sample of the isotope remains unchanged after 11.46 days is 3.82 days.

The radioactive isotopes of an element are known as radioisotopes. They can also be described as atoms with an excessive amount of energy in their nucleus or unstable neutron-proton combinations.

A radioisotope's unstable nucleus can form either naturally or as a result of atomic manipulation. Radioisotope production can take place using a cyclotron or a nuclear reactor, depending on the situation. Molybdenum-99, which has a high neutron content, can be produced most efficiently in nuclear reactors, whereas fluorine-18, which has a high proton content, can be produced most efficiently in cyclotrons.

Uranium is the most well-known illustration of a naturally-occurring radioisotope. Uranium-238 makes up 99.9% of naturally occurring uranium; the remaining 0.7% is the less stable and more radioactive uranium-235, which has three fewer neutrons in its nucleus.

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The provided statement states that a radioisotope's half-life is 3.82 days if 25.0 milligrams of a 200.0-gram initial sample of something like the isotope remain intact after 11.46 days.

An unstable chemical element that releases radiation as it breaks down and becomes more stable. Both natural habitat and then a laboratory can manufacture radioisotopes. They are used in medical treatments and imaging examinations. also called a radionuclide.

Since we now know that first phase kinetics governs radioactive decay,

Therefore, the following is the equation for the rate rule for first order kinetics:

\(k=\frac{2.303}{t} \log \frac{a}{a-x}\)

where,

k = rate constant

t = time taken for decay process  = 11.46 days

a = initial amount of the reactant  = 200 g

After the decay process, the quantity remaining is equal to 25 g.

By plugging data into the equation above, we can get the rate constant.

\(k=\frac{2.303}{11.46} \log \frac{200}{25}=0.1814\)

We now need to determine a radioisotope's half life.

Formula used : \(t_{1 / 2}=\frac{0.693}{k}\)

We obtain the half life by entering the value of "k" into this calculation.

\(t_{1 / 2}=\frac{0.693}{0.1814}=3.820\)

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The complete question is-

What is the half-life of a radioisotope if 25.0 grams of an original 200.-gram sample of the isotope remains unchanged after 11.46 days?

(1) 2.87 d

(2) 11.46 d

(3) 3.82 d

(4) 34.38 d

Answer:

Carpooling with just one other person means that there is one fewer vehicle on the roads. That vehicle won't be emitting greenhouse gases during that commute.

Explanation:

The  way should we run with respect to the wind to minimize your exposure is in the chemical plant, we should move it in the direction that is the opposite to the flow of the wind.

The toxic substance  are those that will have the harmful effect on the living organisms. The effect can be so harmful that it can leads to death after the consumption of the product.

In the chemical plant, we should move it in the direction that is the opposite to the flow of the wind. The movement should be of the water perpendicular with the respect to the wind and is to minimize the exposoure.

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The two likely mechanisms for the reaction of 2-iodohexane with sodium ethoxide are SN2 (substitution) and E2 (elimination). SN2 replaces iodine with ethoxy, while E2 forms a double bond and eliminates hydrogen iodide. Mechanism choice depends on steric hindrance and reactant concentrations.

The two most likely mechanisms for the reaction of 2-iodohexane with sodium ethoxide are nucleophilic substitution (SN2) and elimination (E2) reactions.

1. Nucleophilic Substitution (SN2):

In this mechanism, the nucleophile (sodium ethoxide) attacks the carbon atom bonded to the iodine in a concerted manner, while the iodide ion leaves. This leads to the substitution of the iodine atom with the ethoxy group.

2-iodohexane + Sodium ethoxide → 2-hexanol + Sodium iodide

2. Elimination (E2):

In this mechanism, the strong base (sodium ethoxide) abstracts a proton from a neighboring carbon, causing the formation of a carbon-carbon double bond and the elimination of a molecule of hydrogen iodide.

2-iodohexane + Sodium ethoxide → 1-hexene + Sodium iodide + Ethanol

Both of these mechanisms are common reactions for alkyl halides with strong nucleophiles or bases. The specific mechanism that occurs depends on factors such as the steric hindrance around the reaction center and the concentration of the nucleophile or base.

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3. The height of the graduated cylinder when measuring the volume of co2 (g) produced is adjusted to equalize the pressure in the graduated cylinder with the atmospheric pressure.

We discovered that when the water level within the graduated cylinder is higher than the water level outside, the gases inside the graduated cylinder have a lower pressure than the atmospheric pressure. It would then be possible to equalize pressure by changing the graduated cylinder's water level to match the water level outside.

Therefore last option or 3rd option is the correct choice.

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Answer:

The answer is d-block.      

Explanation:

like the other person said.

Transcription, which involves the unfolding of DNA and the creation of an mRNA strand, is the first stage in the procedure. The cell's nucleus is where this action takes place.

The amino acids are introduced into the expanding protein chain in the correct order thanks to the RNA template that DNA produces. Every specific amino acid is brought to the RNA for incorporation by a particular transfer RNA (tRNA), which is attached to it.

In the ribosome, the process of assembling amino acids occurs. This structure consists of two subunits containing ribosomal RNA that enclose the messenger RNA and catalyze the formation of the amide linkages in the developing protein, a process known as translation.

The two subunits split apart and release the finished protein chain after protein synthesis is finished. Protein synthesis is a fairly quick process. About 3-5 amino acids are added to the lengthening peptide chain every second.

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Yes, if the concentration of the substrate is equal to the km, it can be a steady state condition.

In this situation, the rate of the reaction remains constant over time, and the concentration of the enzyme-substrate complex is at a maximum. The steady state is defined as the state in which the rate of formation of the enzyme-substrate complex is equal to the rate of breakdown of the enzyme-substrate complex. This implies that the concentration of the enzyme-substrate complex is not changing over time. Suppose the concentration of the substrate is equal to the Km of the enzyme. In that case, the rate of the reaction is half its maximum rate, and the enzyme-substrate complex's concentration is at its maximum. At this point, the formation of the enzyme-substrate complex equals its breakdown rate, and the reaction remains constant over time. Thus, this is a steady-state condition.

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Answer:

What artifacts did historian Tom Garner find in the Pensacola Bay area?

Fork from Hernando de Soto ship

Plate from Jamestown colony

Olive jar from Tristan de Luna colony of 1559

Telescope from Ponce de Leon

Explanation:

What artifacts did historian Tom Garner find in the Pensacola Bay area?

Fork from Hernando de Soto ship

Plate from Jamestown colony

Olive jar from Tristan de Luna colony of 1559

Telescope from Ponce de Leon

pH = -log[H3O+] = -log(8.26 x 10^-5) = 4.083 (three decimal places because the concentration had three sig figs)

Answer:

Oil: 379

Natural gas: 23%

Coal: Not provided in the given information.

Explanation:

To determine the total percent of energy that came from fuels emitting greenhouse gases, we need to consider the energy sources mentioned in the chart. The energy sources that emit greenhouse gases are oil, natural gas, and coal.

According to the chart, the percentages of energy from these sources are as follows:

Oil: 379

Natural gas: 23%

Coal: Not provided in the given information.

However, since the information about the percentage of energy from coal is missing, we cannot accurately calculate the total percent of energy that came from greenhouse gas-emitting fuels. Without the data for coal, we cannot determine the exact value for the total percentage.

Please note that for an accurate calculation, the percentage of energy from coal would need to be provided.

Answer:

it's volume also decrease

To answer this question we have to use the rule of dilutions:

Where V1 is the initial volume, C1 is the initial concentration, V2 is the final volume and C2 is the final concentration. In this case we need to find V1.

Solve the equation for V1 and replace C1 for 4.00M, V2 for 665mL and C2 for 0.350M

It means that the volume required is 58.2mL.

Answer:

The answer is Radiation

Answer:

Convectional

Explanation:

It is the movement of heat through fluid

While radiation travels though a vacuum and conduction accrues between atoms / solids

give a brainliest if it desires it plzzzz

The molecule that delivers the acetyl group derived from the pyruvate produced in glycolysis to the citric acid cycle is coenzyme A (CoA).

Coenzyme A (CoA) is a molecule involved in several metabolic pathways that occur within cells. The molecule is important in the metabolism of carbohydrates, lipids, and proteins. In particular, CoA is involved in the process of transferring acyl groups. The citric acid cycle is a metabolic pathway that takes place in the mitochondria of eukaryotic cells. The pathway involves the oxidation of acetyl groups, which are derived from the breakdown of glucose and other biomolecules. The acetyl group is attached to CoA to form acetyl-CoA, which is then delivered to the citric acid cycle. Acetyl-CoA is converted into citrate, which undergoes a series of reactions to produce energy in the form of ATP. The citric acid cycle is an important part of cellular respiration, which is the process by which cells obtain energy from organic molecules.

Therefore, coenzyme A (CoA) is the molecule that delivers the acetyl group derived from the pyruvate produced in glycolysis to the citric acid cycle.

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Answer:

150

Explanation:

300 divided by 2

Answer:

B and C

Explanation:

is it multiple choice question??

Van der Waals forces are the interaction between the molecules and the atoms. It increases with an increase in the molecular size and the number of electrons. Thus, options B and C are correct.

Van der Waals forces are the weak forces of attraction and repulsion present between the atoms and the molecules of the compounds. They are also called London Dispersion Forces and dipole-dipole forces.

An increase in the number of electrons and size of the molecule increases the surface area and the electron cloud which in turn, increases the Van der Waals force.

The intermolecular force increases as in large atoms or molecules the valence are held loosely as they are far from the nucleus or the center of the atom.

Therefore, the size and the electron increase the Van der Waals force.

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Answer:

Different

Explanation:

Surely, the longitude lines and latitude lines where you are different from the longitude lines and latitude lines where your friend is. This is evident from the fact that sun's position in the sky is different at same time of the date. Your are the equator, then your friend must be above equator in northern hemisphere or below in southern hemisphere.

Using Avogadro's number, which indicates that there are \(6.022 * 10^2^3\)formula units (atoms, molecules, or ions) in one mole of a substance, we can calculate the number of moles equivalent to \(2.4 * 10^2^3\) formula units of sodium chloride.

Given that \(6.022 * 10^2^3\) is the base of the formula for Avogadro's number per mole, we can set up a ratio to get the number of moles:

(\(2.4 * 10^2^3\)formula units) / (\(6.022 * 10^2^3\) formula units/mol)

The same number of moles can be calculated by dividing two numbers:

\((2.4 * 10^2^3) / (6.022 * 10^2^3) = 0.399 moles\)

Therefore, 0.399 moles of sodium chloride is roughly equivalent to \(2.4 * 10^2^3\) formula units of sodium chloride.

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Your question is incomplete, most probably the complete question is:

How many moles are equal to 2.4×10^23 formula units of sodium chloride

Answer:

A meter is 100 times larger then a centimeter

Answer:

1,2,3,4,8,9,10,12,14,15 and 16

Explanation:

Coz they have different kinds (colours) of atoms

The rest are pure substances,

I'm not so sure though, double check after this