Why does it take a lot of energy for water to boil?
Water has weak bonds inside of the molecule.
Water has strong intermolecular forces (Hydrogen bonding)
Water has weak intermolecular forces (Dispersion forces)
Water has strong bonds inside of the molecule

Answer:

So, total number of atoms = 6 + 12 + 6 = 24.

Explanation:

Correct option is B, In the given reaction, Jason should place two of them as reactants.

Let's write the reaction down in chemical symbols to make it easier to understand and to have a clearer picture of it.

Reaction 1

N₂(g) + O₂(g) → 2NO

Reaction 2

2 NO(g) + O₂(g) → 2NO₂(g)

overall reaction;

N₂(g) + 2O₂(g) → 2NO₂(g)

As a result, it is clear that there are two simple reactions involved in the overall reaction. Keep in mind that the total reaction in a series of nonelementary reactions is the sum of all the individual stages. Only when two species are on opposing sides of the reaction equation can they cancel one another out.

In this instance, oxygen is present on the reactants side in both reaction equations; as a result, the overall reaction equation also calls for oxygen to be present on the reactants side with the appropriate stoichiometric coefficient to display the amount of oxygen moles involved.

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Complete Question -

Jason combines the two intermediate steps shown.

2 equations. First: upper N subscript 2 (g) plus upper O subscript 2 (g) right arrow 2 upper N upper O (g). Second: 2 upper N upper O (g) plus upper O subscript 2 (g) right arrow 2 upper N upper O subscript 2 (g).

Which best describes what Jason should do with the oxygen molecules?

Place two of them as products.

Place two of them as reactants.

Cancel them out because there is one in each equation.

Double them because there is one in each equation.

Explanation:

there you go you can just look up atomic model for CD and click images

Answer:

5=D

6=B

7=A

8=?????

1A= conduction

1B= radiation

1C= convection

3: C

4: A

Explanation:

2: The heat from the hot water is been transferred along the metal handle to the other end of the spoon by the process of CONDUCTION.

Answer:

3 Cu + 8 HNO3 --> 3 Cu(NO3)2 + 2 NO + 4 H2O

Explanation:

Make sure both sides are equal

3 Cu + 8 HNO3 --> 3 Cu(NO3)2 + 2 NO + 4 H2O

// start by those elements that change their oxidation degree

Cu and N

// also you can write reduction-oxidation reactions

\(Cu^{0}\) + 2 \(e^{-}\) --> \(Cu^{-2}\) | 2

\(N^{+5}\) - 3 \(e^{-}\) -->  \(N^{+2}\) | 3

// write the numbers of electrons that are lost/gained as the coefficients of the opposite elements

// then check if H and O are the same on both sides

// adjust if they aren't.

Answer:

Explanation:

3Cu + 2HNO3 --> 3Cu(NO3)2 + 2NO + 2H2O

The [H3O+] of a water solution with (OH) of 1 x 10-4 mol/L is 1x10-10 mol/L.

The concentration of H3O+ and OH- ions in a water solution are related by the equation Kw = [H3O+][OH-], where Kw is the ion product constant of water and has a value of 1.0 x 10^-14 at 25°C. To find the [H3O+] given [OH-], we can rearrange this equation to solve for [H3O+]. This gives us [H3O+] = Kw/[OH-]. Substituting in the given value of [OH-] gives us [H3O+] = (1.0 x 10^-14)/1.0 x 10^-4, which simplifies to 1 x 10^-10 mol/L. Therefore, the [H3O+] of the solution is 1x10-10 mol/L.

The OH concentration of a solution with a pH of 5 is 1x10-9 mol/L.The pH of a solution is defined as the negative logarithm of the [H3O+] of the solution, or pH = -log[H3O+]. To find the [OH-] concentration, we can use the relationship Kw = [H3O+][OH-]. Rearranging this equation to solve for [OH-] gives us [OH-] = Kw/[H3O+]. Substituting in the given pH of 5 and using the fact that pH + pOH = 14 gives us [H3O+] = 1x10-5 mol/L. Substituting this value into the equation for [OH-] gives us [OH-] = 1x10-14/1x10-5, which simplifies to 1x10-9 mol/L. Therefore, the [OH-] concentration of the solution is 1x10-9 mol/L.

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Answer:

c. colour

other options will have effect on the bottle

Answer:

To avoid spattering

Explanation:

If we are heating a hydrate to drive off the water of crystallization, we must initially heat the hydrate gently, at a lower temperature and then more strongly only after most of the water has been driven off in order to to prevent spattering.

Since we obtain the amount of water by the mass difference, Spattering  decreases the mass of water obtained and ultimately results in a lower percent of water being calculated for the hydrate.

The noble gas with a molar mass of 80.0 g/mol is Krypton (Kr).

To find the molar mass of the noble gas, follow these steps:

1. Convert the given pressure to atmospheres: 758 mm Hg × (1 atm / 760 mm Hg) = 0.998 atm.
2. Convert the given temperature to Kelvin: 23.0 °C + 273.15 = 296.15 K.
3. Use the ideal gas law equation, PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant (0.08206 L atm / mol K), and T is the temperature.
4. Rearrange the equation to solve for n: n = PV / RT.
5. Plug in the given values: n = (0.998 atm × 40.75 L) / (0.08206 L atm / mol K × 296.15 K) = 1.7515 mol.
6. Calculate the molar mass by dividing the mass of the gas by the number of moles: Molar mass = 140.1 g / 1.7515 mol = 80.0 g/mol (rounded to 3 significant figures).

The noble gas with a molar mass of 80.0 g/mol is Krypton (Kr).

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The answer is that all of the following changes to Earth's atmosphere would increase the greenhouse effect: increasing the concentrations of carbon dioxide, methane, nitrous oxide, and other greenhouse gases; reducing the amount of aerosols in the atmosphere; and decreasing the amount of clouds in the atmosphere.

Increasing the concentrations of greenhouse gases such as carbon dioxide, methane, and nitrous oxide traps more heat in the atmosphere, leading to an increase in the greenhouse effect.

Reducing the amount of aerosols in the atmosphere also increases the greenhouse effect, as aerosols can act as a cooling agent and reduce the amount of heat that is trapped in the atmosphere.

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Answer:

Volume = 190.8

C. 0.5

This is the answer.

(assuming that the D option is 1, if it is 0.1 then the answer is 0.1)

\(0.5\)

Explanation:

As you know that decreasing in the concentration of OH- (i.e., 14, 13, 12, 11,..) makes to increase in the concentration of H+ ions (5,4,3,2,1).

If the central metal ion is sp² hybridized in the new atom, it means that bond of carbon are formed by hybridization of 2 s orbitals and 1 p orbital.

Hybridization means that there is not a singular orbital, there is a new orbital which is forced by the hybridization of the old orbital.

It also means that the central carbon atom is an alkene. it will have a double bond.

It will have two sigma bonds and one pi bond. The bonding in the sp² orbital will have the electron in the s orbital and the p orbital while the carbon atom is in the excited state. Here, s orbitals will be forming two sigma bond and p orbital will be forming the pi bond.

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The deep red color in Fe3+ is due to d-d electronic transitions within the high-spin electron configuration. Fe3+ has five unpaired d electrons in its outermost shell, which results in a strong absorption of light in the visible range.

The high extinction coefficient reflects the efficiency with which light is absorbed by the molecule, resulting in a deep red color. The absorption of light causes electrons to move from one d orbital to another, resulting in electronic transitions that give rise to the characteristic color of Fe3+.
                            the electronic transition responsible for the deep red color in Fe3+ with a high-spin electron configuration, given the high extinction coefficient.
                                              The electronic transition responsible for the deep red color in high-spin Fe3+ is the Ligand-to-Metal Charge Transfer (LMCT) transition. In this transition, an electron moves from a ligand's molecular orbital to an empty metal-centered d-orbital, which leads to the absorption of light in the visible spectrum, causing the deep red color. The high extinction coefficient indicates a strong absorption, which supports the presence of a LMCT transition in this case.

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Answer:

4. 60 neutrons.

Explanation:

The given isotopes;

         ¹⁰⁶₄₆Pd

In this isotope, we can deduce that the mass number is the superscript and the atomic number is the subscript;

     Mass number  = 106

     Atomic number  = 46

Mass number is the number of protons and neutrons in an atom;

       Mass number = Protons + neutrons

Atomic number is the number of protons

So,  Number of protons  = 46

Number of neutrons  = Mass number  - Atomic number

                                    = 106  - 46

                                     = 60

Number of neutrons  = 60

Bromination took place at the position on the ring indicated by the experimental results due to its relatively more electron density.

In the experiment 40, acetanilide and aniline were reacted with bromine to observe the relative reactivities of several aromatic compounds. The substituent that was found to be least activating was the nitro group (-NO2).Nitro group has a high electron-withdrawing effect on the ring, which makes it a deactivating group.

As a result, it slows down the rate of electrophilic substitution reaction. Bromination, being an electrophilic substitution reaction, occurs slowly on nitro-substituted aromatic compounds. The reaction is likely to take place at a position on the ring that has relatively more electron density than the other positions.

This is because the bromine, being an electrophile, is attracted to the electron-rich part of the ring.The experiment's results indicated that bromination took place at the position ortho to the nitro group (-NO2). This is because the ortho position has relatively more electron density than the para and meta positions.

The ortho position is the most preferred position for bromination on a nitro-substituted benzene ring. The reason is that the nitro group (-NO2) has a +M effect on the ortho position, which makes it relatively more electron-rich than the para and meta positions. Thus, the bromine is attracted to the ortho position, where it replaces a hydrogen atom, forming the ortho-bromonitrobenzene product.

In conclusion, the nitro group (-NO2) is a deactivating group that slows down the rate of electrophilic substitution reaction. Bromination occurs slowly on nitro-substituted aromatic compounds, and it takes place at the position ortho to the nitro group (-NO2) due to its relatively more electron density.

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Answer:

2.38x10²³ atoms oxygen

Explanation:

To solve this question we need to convert the mass of sand to moles using its molar mass (Molar mass SiO₂ = 60.08g/mol). Twice these moles are the moles of Oxygen and using Avogadro's number we can find the amount of atoms of Oxygen in the mixture:

Moles SiO₂:

11.87g * (1mol / 60.08g) = 0.1976moles SiO₂

Moles Oxygen:

0.1976moles SiO₂* 2 = 0.3951moles oxygen

Atoms oxygen:

0.3951moles oxygen * (6.022x10²³atoms / 1mol O₂) =

Answer:

Explanation:

Solid is a hard and not able to flow; not like a liquid or gas. Having no holes; not hollow. Something that is not liquid and gas. Solid has fixed volume but not a fixed shape.

The liquid is something that flows freely; a substance that is not solid or gas.

Gas is a substance that neither liquid nor solid, e.g. air.

Plasma is an electrically neutral ionized gas in an electric discharge; distinctly different from solids and liquids and normal gases.

Therefore, the correct answer is C. solid.

Answer:

A. Liquid

Explanation:

the guy above me is wrong

The original culture density (OCD) of a sample density would be 1,720,000 colony-forming units per unit volume.

The dilution factor is the ratio of the volume of the original sample to the volume of the final diluted sample. In this case, the final dilution factor is 10^-4, which means that the original sample was diluted by a factor of 10,000.

To calculate the OCD, we use the formula: OCD = CFU / Dilution Factor. In this case, the CFU count is given as 172 and the dilution factor is 10^-4.

Using the formula, OCD = 172 / 10^-4, we can simplify the calculation by converting the dilution factor to a whole number. 10^-4 is equivalent to 1 / 10,000.

Substituting the values, OCD = 172 / (1 / 10,000). Dividing by a fraction is equivalent to multiplying by its reciprocal, so OCD = 172 * 10,000.

Calculating the product, OCD = 1,720,000. Therefore, the original culture density of the sample would be 1,720,000 colony-forming units per unit volume.

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No, it does not pass the "fat pencil" test. Therefore, a normal distribution is not a reasonable model. Option B is the correct answer.

The "fat pencil" test is a quick visual check to determine if a dataset can be reasonably approximated by a normal distribution. In this case, the pH readings of wastewater show a significant deviation from a normal distribution. The presence of several low pH values (1.0) and a few high pH values (10.0, 10.5, 11.4) indicate a non-normal distribution with skewness and potential outliers. Therefore, it is not reasonable to model these data using a normal distribution.

Option B is the correct answer.

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Answer: It has more neutrons. Its mass number is larger than the atomic mass number for carbon.

Explanation:

We can see that all the isotopes of Carbon occupies the same slot in the periodic table and thus the same periodic number.

Atomic number of carbon = 6

Periodic Table gives us the information of Atomic number and mass number of atoms of an element.

Atomic number does not give any information about the number of neutrons of an atom. Atomic number of an element is the number of protons in the nucleus of each atom of that element.

Mass number is defined as the total number of protons and neutrons in an atom. Mass number of a typical carbon atom is equal to 12.

Isotopes are variants of a particular chemical element which differ in number of neutrons. Hence, the mass number of different isotopes of the same element varies and gives us information about the number of neutrons present in that atom at the same time.

The mass number of Carbon-14 is equal to 14.

Atomic number of C-14 = Protons in Carbon-14 = 6

Neutrons in Carbon-14 = Mass Number - Atomic Number

Neutrons in C-14 = 14-6

= 8

Answer:

A) To become more stable .

A radioisotope undergo nuclear decay to become more stable. Therefore, option A is correct.

The term nuclear decay is defined as the set of different processes by which an unstable atomic nucleus spontaneously emits subatomic particles.

There are three common types of decay are alpha decay (α-decay), beta decay (β-decay), and gamma decay (γ-decay), all are involve in emitting one or more particles.

When a radioisotope experiences nuclear decay, its nucleus emits particles that change it into a new, potentially radioactive isotope. A proton will become a neutron and release a beta-plus particle (positron), which is an electron with a positive charge, if an unstable nucleus has too many protons.

Thus, option A is correct.

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Explanation:

to see how a change in a reactant concentration would affect the speed of the chemical reaction

To demonstrate the synthesis of aspirin, data such as the appearance of the product (colour, texture), yield (amount of product obtained), and spectral data (such as infrared spectroscopy) that can prove the existence of the aspirin functional groups would normally be collected.

The purity of the aspirin obtained may be determined using techniques such as thin-layer chromatography (TLC) or high-performance liquid chromatography (HPLC), which can detect the presence and amount of contaminants.

Furthermore, melting point determination may be utilized to determine the purity of an aspirin product.

If the observed melting temperature matches the anticipated melting point of pure aspirin (159°C), it demonstrates purity.

Thus, this way, one can collect data asked.

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Your question seems incomplete, the probable complete question is:

What data did you collect to indicate that you produced aspirin? What did your results indicate about the purity of the aspirin you obtained? Explain your answers. Given that the melting point acid is 159 degree C, can you be certain that the product you isolated was not pure salicylic acid that was of salicylic be that the product you was unchanged during the reaction?

Answer:

Any two reasons will be :

1:- It is based on atomic number.

2:-Problem regarding Position of isotopes is resolved.

Hope this helped

Hope this helped ALL THE BEST !!

Answer:

The modern periodic table has more info and more elements

Explanation:

The type of reaction is a double replacement reaction. In a double replacement reaction, the positive ions of two compounds switch places to form two new compounds.

The balanced chemical equation for the reaction between magnesium and lead(II) nitrate is:

Mg(s) + Pb(NO3)2(aq) -> Mg(NO3)2(aq) + Pb(s)

In this equation, the magnesium and lead ions switch places to form the new compounds magnesium nitrate and lead. The coefficients in front of the compounds indicate the number of moles of that substance that are involved in the reaction. The subscripts indicate the number of atoms of each element in each compound.

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Answer:

A group of cells working together is defined as a tissue and several tissues working together comprise an organ.

Explanation:

To determine the limiting reactant, we need to compare the moles of each reactant and their stoichiometric coefficients in the balanced equation. The balanced equation for the reaction is:

C + SiO2 -> SiC + CO2

First, we convert the masses of carbon (C) and silicon dioxide (SiO2) to moles using their respective molar masses. The molar mass of carbon (C) is 12.01 g/mol, and the molar mass of silicon dioxide (SiO2) is 60.08 g/mol.

Moles of C = mass of C / molar mass of C = 2.50 g / 12.01 g/mol = 0.208 mol C

Moles of SiO2 = mass of SiO2 / molar mass of SiO2 = 2.50 g / 60.08 g/mol = 0.0416 mol SiO2

Next, we compare the moles of each reactant to their stoichiometric coefficients in the balanced equation:

From the balanced equation: 1 mol C reacts with 1 mol SiO2

Since the ratio of moles of C to moles of SiO2 is 0.208 mol C : 0.0416 mol SiO2, we can see that the mole ratio is 5:1. Therefore, for every 5 moles of carbon, 1 mole of SiO2 is required.

Since we have equal moles of carbon and silicon dioxide (0.208 mol C and 0.0416 mol SiO2), we can see that the limiting reactant is SiO2. It is the limiting reactant because there is not enough SiO2 to react completely with the available carbon.

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