a. 24.5 g of ammonia NH3 = how many moles of ammonia?

.b How many molecules of ammonia is that from 22.a.?

Answer:

from the spaces left between chains when the polymer is

formed.

Explanation:

Polyethylene polymer may be of high or low density. Whether the polymer is of high or low density depends on the arrangement of the polymer chains.

If the polymer chains are close together such that the resultant polymer is crystalline with chains packed closely, we have high density polyethylene.

On the other hand if the chains are not close together and there are spaces left between chains when the polymer is formed, then we have low density polyethylene.

Hence, low density polyethylene gets its name from the spaces left between chains when the polymer is formed.

Answer: it gets its name (from the process by which it's polymerized). Therefore the correct option is A.

Explanation:

Polyethylene is a type of plastic which is made by the polymerization of its monomers (ethene). The most common monomers are derived from petrochemicals. The monomers simply join together to form the polymers which has the same empirical formula as the monomer, but is of a higher molecular mass.

There are two main types of polyethylene, these include:

--> Low density polyethylene: when ethene is subject to a high temperature of about 250°C and pressure above 1500atm, together with traces of oxygen ( as an initiator), it polymerizes to polyethylene. The polyethylene obtained by the above method is called a low density polyethylene. It has the most long- and short-chain branching of any form of polyethylene, resulting in its lower density. Therefore its name is gotten from the process by which it's polymerized

--> High density polyethylene: this is prepared at a lower temperature and pressure by using catalysts.

Answer:

SnO2

Explanation:

The limiting reactant is the reactant that runs out first during a chemical reaction.

Reactants are on the left side of the reaction, so SnO2 and H2. They tell us in the question that there is "excess" hydrogen (H2), so we know there is plenty of it, as "excess" means "more than enough." If we have more than enough hydrogen, then we know that we will run out of SnO2 first.

:)

Answer:SnO2

Explanation:

Answer:

Explanation:

given amount of salt at time t is A(t)

initial amount of salt =300 gm =0.3kg

=>A(0)=0.3

rate of salt inflow =5*0.4= 2 kg/min

rate of salt out flow =5*A/(200)=A/40

rate of change of salt at time t , dA/dt= rate of salt inflow- ratew of salt outflow

\(dA/dt=2-(A/40)\\\\dA=2dt-(A/40)dt\\\\dA+(A/40)dt=2dt\)

integrating factor

\(=e^{\int\limits (1/40) \, dt}\)

integrating factor \(=e^{(1/40)t}\)

multiply on both sides by  \(=e^{(1/40)t}\)

\(dAe^{(1/40)t}+(A/40)e^{(1/40)t} dt =2e^{(1/40)t}t\\\\(Ae^{(1/40)t})=2e^{(1/40)t}t\)

integrate on both sides

\(\int\limits(Ae^{(1/40)t})=\int\limits2e^{(1/40)t}dt\\\\(Ae^{(1/40)t})=2*40e^{(1/40)t}+C\\\\A=80+(C/e^{(1/40)t})\\\\A(0)=0.3\\\\0.3=80+(C/e^{(1/40)t}^*^0)\\\\0.3=80+(C/1)\\\\C=0.3-80\\\\C=-79.7\\\\A(t)=80-(79.7/e^{(1/40)t})\)

b)

after long period of time means t - > ∞

\({t \to \infty}\\\\ \lim_{t \to \infty} A_t \\\\ \lim_{t \to \infty} (80)-(79/{e^{(1/40)t}}\\\\=80-(0)\\\\=80\)

15. To counter the effects of gravity and allow the universe to remain static.

16. The Steady State Theory.

17. Edwin Hubble.

18. No, the galaxies expand away from each other at different rates depending on their distances.

15. Einstein created the cosmological constant in an effort to counteract the forces of gravity, preventing the cosmos from growing or contracting but keeping it static at the same size.

16. The Steady State Theory, which was put forth in the 1920s, claimed that the world is motionless and limitless, and that new stuff is constantly being produced as the universe expands.

17. American astronomer Edwin Hubble observed that galaxies were moving apart from one another, and that the farther they were from one another, the quicker they were travelling, which led him to conclude that the universe was expanding in 1929.

18. Depending on how far apart they are from one another, galaxies separate from one another at varying rates. The greater the distance between any two galaxies

To learn more about gravity visit:

https://brainly.com/question/2230829

#SPJ1

The number-weighted average molecular weight of this polymer sample is 2,000 g/mol.

To calculate the number-weighted average molecular weight of a polymer, you need to divide the total molecular weight of the sample by the number of polymer molecules.

Number-weighted average molecular weight (Mn) = Total molecular weight / Number of polymer molecules

In this case, the total molecular weight of the polymer sample is 2,000,000 g/mol, and there are 1,000 polymer molecules.

Mn = 2,000,000 g/mol / 1,000 molecules

Mn = 2,000 g/mol

Therefore, the number-weighted average molecular weight of this polymer sample is 2,000 g/mol.

Learn more about molecular weight from the link given below.

https://brainly.com/question/20380323

#SPJ4

Isotopes are atoms of the same element that have different numbers of neutrons. Based on this definition, the pair of isotopes among the given options is C) ²⁸Si and ²⁹Si. Isotope ²⁸Si has 14 protons and 14 neutrons, while isotope ²⁹Si has 14 protons and 15 neutrons.

These isotopes have the same number of protons, indicating that they belong to the same element, silicon (Si), but they differ in the number of neutrons.

Option A) ²⁸Si and ²⁸Si⁴⁺ represents an ion of silicon, not an isotope. The presence of a positive charge indicates the loss of electrons.

Option B) ²⁸Si and ²⁸Al represent different elements, silicon and aluminum, respectively, so they are not isotopes.

Option D) ²⁸Si and ²⁸Si⁴⁻ represents an anion of silicon, not an isotope. The presence of a negative charge indicates the gain of electrons.

Option E) ²⁸Si⁴⁺ and ²⁸Al³⁺ represent different elements, silicon and aluminum, respectively, so they are not isotopes.

Therefore, the correct answer is C) ²⁸Si and ²⁹Si, which represent isotopes of silicon.

Learn more about Isotopes  here: brainly.com/question/30703101

#SPJ11

Answer:

the reaction is synthesis When two or more simple compounds combine to form a more complicated one. This is also known as a direct combination reaction.

Explanation:

=》 ᴛʜᴇʏ ʟᴏᴏᴋ ꜰᴏʀ ᴛʜᴇ ᴅᴇᴄᴀʏ ᴘʀᴏᴅᴜᴄᴛꜱ. ᴛʜᴇʏ ʟᴏᴏᴋ ꜰᴏʀ ᴛᴇʟʟᴛᴀʟᴇ ꜱɪɢɴꜱ ꜰᴏʀ ᴡʜᴇɴ 115 ᴅɪꜱɪɴᴛᴇɢʀᴀᴛᴇꜱ, ʙʏ ᴡʜᴀᴛ'ꜱ ᴄᴀʟʟᴇᴅ ᴀʟᴘʜᴀ ᴘᴀʀᴛɪᴄʟᴇ ᴇᴍɪꜱꜱɪᴏɴ. ᴡʜᴇɴ ᴛʜᴇʏ ꜱᴇᴇ ᴇɴᴏᴜɢʜ ᴏꜰ ᴛʜᴏꜱᴇ ꜱɪɢɴᴀʟꜱ, ᴛʜᴇʏ ᴄᴀɴ ꜱᴀʏ ᴛʜᴇʏ ᴘʀᴏʙᴀʙʟʏ ꜰᴏʀᴍᴇᴅ ᴀ ɴᴇᴡ ᴇʟᴇᴍᴇɴᴛ.

Answer:

A decade is 10 years. Therefore you must first multiply ten by five to get 50. After you multiply the 12 months in a year by the 50 years. Your answer should be 600

Explanation:

Answer:its d

Explanation:just took it

CO₃⁻² and  HCO₃⁻¹ are acid-conjugate base pair.

A conjugate acid-base pair, according to the Brnsted-Lowry definition of acids and bases, consists of two substances that are distinct only in that they contain a proton (H⁺). A proton given to a base creates a conjugate acid, while a proton taken away from an acid creates a conjugate base.

A conjugate base differs from the forming acid in that it has one additional (-) ve charge and one fewer H atom. It is an acidic residue left over after the hydrogen ion has been removed.

The reaction becomes:

HNO₃ + CO₃⁻² → HCO₃⁻¹+ NO₃⁻¹

In the above reaction, it is observe that,

CO₃⁻² and  HCO₃⁻¹ are acid-conjugate base pair.

correct option is: D

To know more about acid-conjugate base pair refer to:

https://brainly.com/question/16938292

#SPJ1

Neutron diffraction, on the other hand, is commonly used to determine magnetic structures in materials due to the interaction of neutrons with magnetic moments.

X-ray diffraction, electron diffraction, and neutron diffraction are commonly used techniques to study the crystallographic properties of solids.

Here's a comparison of these three techniques in terms of particle energies and types of information obtained:

Particle Energy:

X-rays have high energy in the electromagnetic spectrum.

Information Obtained:

X-ray diffraction provides information about the arrangement of atoms within a crystal lattice, crystal symmetry, interatomic distances, and crystal plane orientations.

It is widely used for structural determination of crystalline materials.

Surface Crystallography:

X-ray diffraction is suitable for studying the bulk crystal structure and is less appropriate for surface crystallography due to the low penetration depth of X-rays in materials.

Particle Energy:

Electrons can have high energies (e.g., in electron microscopy) or low energies (e.g., in electron diffraction experiments).

Information Obtained:

Electron diffraction can provide detailed structural information about crystals, including crystal symmetry, lattice parameters, and atomic arrangement.

It is particularly useful for studying small crystals, nanostructures, and thin films.

Surface Crystallography:

Electron diffraction can be used to study surface crystallography, as electrons can penetrate the surface layers of materials.

Particle Energy:

Neutrons have intermediate energy levels.

Information Obtained:

Neutron diffraction provides information about atomic positions, magnetic moments, and magnetic structures of materials.

It is particularly sensitive to light elements and can be used to determine the positions of hydrogen atoms in crystal structures.

Surface Crystallography:

Neutron diffraction is less commonly used for surface crystallography due to the limited penetration depth of neutrons in materials.

For studying surface crystallography, electron diffraction is generally the most appropriate technique due to its ability to penetrate surface layers and provide detailed structural information at the nanoscale.

Neutron diffraction, on the other hand, is commonly used to determine magnetic structures in materials due to the interaction of neutrons with magnetic moments.

Learn more about Neutron diffraction from this link:

https://brainly.com/question/31324813

#SPJ11

If you started with 1.5 moles of H2 at STP, you would have approximately 33.6 liters of volume of hydrogen (H₂) gas.

To determine the number of liters of H2 you have, we need to consider the conditions under which the gas is being held (i.e. temperature and pressure), as well as the molar volume of H2 at those conditions.

At standard temperature and pressure (STP), which is 0°C (273.15 K) and 1 atm (101.325 kPa), the molar volume of any ideal gas is approximately 22.4 L/mol.

Therefore, at STP, 1.5 moles of H₂ would occupy approximately:

V = n x Vm = 1.5 mol x 22.4 L/mol = 33.6 L

Learn more about volume of gas here: https://brainly.com/question/25736513

#SPJ1

The complete question is below:

HOW MANY LITERS OF H2 DO YOU HAVE IF YOU START WITH 1.5 MOLES OF H2? (assume STP condition)

Answer:

To find out the number of atoms: MULTIPLY all the SUBSCRIPTS in the molecule by the COEFFICIENT. (This will give you the number of atoms of each element.)

Explanation:

Answer:

One type of cleaner that is highly effective for removing mineral deposits is an acid-based cleaner.

Explanation:

Mineral deposits, such as limescale, rust, or hard water stains, can be stubborn and difficult to remove. Acid-based cleaners are specifically formulated to dissolve and break down these mineral deposits. The acidic properties of these cleaners work by reacting with the minerals, causing them to loosen and dissolve, making it easier to remove them from various surfaces.

Two commonly used acid-based cleaners for removing mineral deposits are vinegar and lemon juice. Vinegar, which contains acetic acid, can be applied directly or used as a soak to effectively remove mineral deposits on surfaces.

A mineral deposit refers to the accumulation or concentration of minerals in a specific location or geological formation. It occurs through natural processes over extended periods of time. Mineral deposits can be found in various forms, such as solid masses, veins, or scattered grains within rocks or sediments.

To learn more about acid-based cleaner,

https://brainly.com/question/14307840

https://brainly.com/question/25903586

One type of cleaner that is highly effective for removing mineral deposits is an acid-based cleaner. Mineral deposits, such as those caused by hard water or limescale, are often composed of calcium, magnesium, and other minerals that can be dissolved by acidic substances.

Acid-based cleaners work by reacting with the mineral deposits, breaking them down and dissolving them. Common examples of acid-based cleaners include vinegar (acetic acid), lemon juice (citric acid), and commercial descaling products that contain stronger acids like hydrochloric acid or phosphoric acid. The acidic nature of these cleaners allows them to effectively remove mineral deposits from various surfaces, such as sinks, faucets, showerheads, and toilet bowls. The acids react with the minerals, causing them to dissolve and be easily wiped or rinsed away. However, it's important to exercise caution when using acid-based cleaners as they can be corrosive to certain materials, such as marble or some types of metal. It's recommended to follow the manufacturer's instructions and test the cleaner on a small, inconspicuous area before applying it to the entire surface.

To learn more about mineral click here; brainly.com/question/13501509

#SPJ11

The total number of valence electrons in the Lewis structure of SeF2O is 26.

To determine the total number of valence electrons in the Lewis structure of SeF2O, we need to consider the valence electrons contributed by each atom.

Sulfur (S) is in Group 16 of the periodic table and has 6 valence electrons.

Fluorine (F) is in Group 17 of the periodic table and has 7 valence electrons.

Oxygen (O) is in Group 16 of the periodic table and also has 6 valence electrons.

For SeF2O, we have:

1 atom of S, which contributes 6 valence electrons

2 atoms of F, which contribute 2 × 7 = 14 valence electrons

1 atom of O, which contributes 6 valence electrons

Total valence electrons = 6 + 14 + 6 = 26

Therefore, the total number of valence electrons in the Lewis structure of SeF2O is 26.

To draw the Lewis structure of SeF2O, we can follow these steps:

1. Determine the central atom: In this case, Sulfur (S) is the central atom since it is less electronegative than Oxygen (O) and Fluorine (F).

2. Connect the outer atoms to the central atom using single bonds: Attach the two Fluorine atoms (F) to the Sulfur atom (S) using single bonds.

    F-S-F

3. Assign remaining valence electrons to outer atoms: After connecting the Fluorine atoms (F) to the Sulfur atom (S), we have 26 - 2 = 24 valence electrons remaining.

4. Place remaining valence electrons on the central atom: The remaining 24 valence electrons will be placed on the central atom, Sulfur (S), and Oxygen (O), taking into account the octet rule.

      F-S-F

         |

         O

5. Check octet rule and adjust if necessary: In this case, the Sulfur (S) atom has 8 electrons (full octet) and the Oxygen (O) atom has 6 electrons. Since Oxygen can accommodate more than 8 electrons, we can leave it with 6 electrons.

The final Lewis structure of SeF2O will have a single bond between Sulfur (S) and each Fluorine (F) atom, and a lone pair on the Oxygen (O) atom.

Learn more about Lewis structure at: https://brainly.com/question/13820123

#SPJ11

An isothermal temperature profile from surface to seafloor may exist in coastal ocean waters.

Answer: a. true

Isothermal refers to a situation where the temperature remains constant with depth. In some coastal ocean waters, this is possible due to factors such as sunlight penetration, water mixing, and limited temperature differences between the surface and seafloor.

Isothermal" means that hotness waits uninterrupted in rule and opportunity and skilled is no heat transfer. Change Domain Heat Transfer model to Thermal Energy or Total Energy expected smart to use hotness classification. "Isothermal" method that hotness debris perpetual in rule and period and skilled is no heat transfer.

The seafloor is below the sea. All floors of the sea are popular as 'seabeds' in the coastal ocean waters. The building of the seabed of the all-encompassing sea is controlled by plate tectonics. Most of the sea is very deep, place the bottom of the sea is famous as the unfathomable plain. The seafloor (as known or named at another time or place as the seafloor, expanse floor, the bottom of the sea, and the bottom of the sea) is below the sea. All floors of the sea are famous as 'seabeds'.

To learn more about seafloor, visit:

https://brainly.com/question/12037536

#SPJ11

Answer:

The answer will be B

Explanation:

Answer:

B.the neutron in the nucleus

Explanation:

Answer:

Polar Covalent Bond

Explanation:

Answer:Carbon forms a double bond to oxygen in aldehydes, ketones and acyl halides. In carboxylic acids, esters and anhydrides, each carbonyl carbon atom forms one double bond and one single bond to oxygen. In carbonate esters and carbonic acid, the carbonyl carbon forms one double bond and two single bonds to oxygen.

Carbon–oxygen bond - Wikipediahttps://en.wikipedia.org › wiki ›

The entropy of 100 g of water at 100 oC changes by 60.5 J/K.  when it is very slowly converted into steam at 100 oC.

To determine the entropy change when 100 g of water at 100°C is slowly converted into steam at 100°C, we can use the formula:

ΔS = m * L / T

where ΔS is the entropy change, m is the mass of the water (100 g), L is the latent heat of vaporization for water (approximately 2.26 x 10^6 J/kg), and T is the temperature in Kelvin (100°C + 273.15 = 373.15 K). Note that we need to convert the mass of water into kg (100 g = 0.1 kg).

ΔS = (0.1 kg) * (2.26 x 10^6 J/kg) / (373.15 K)

ΔS ≈ 60.5 J/K

So, the entropy change when 100 g of water at 100°C is very slowly converted into steam at 100°C is approximately 60.5 J/K.

To know more about entropy click on below link :

https://brainly.com/question/30880708

#SPJ11

Secondary consumers are organisms that primarily feed on herbivores or other primary consumers.

They occupy the next trophic level above the primary consumers in a food web. They obtain energy by consuming the primary consumers and play an important role in regulating the population of herbivores.

Examples of commonly observed secondary consumers include:

Carnivorous mammals: Animals such as wolves, lions, and tigers that feed on herbivores like deer, zebras, or gazelles.

Birds of prey: Species like eagles, hawks, and owls that consume small mammals, reptiles, or other birds.

Carnivorous fish: Fish like pike, barracuda, or bass that prey on smaller fish or aquatic invertebrates.

Predatory insects: Insects such as spiders, mantises, or dragonflies that feed on other insects, including herbivorous insects.

In a specific food web, the identification of secondary consumers would depend on the specific organisms present and their feeding interactions. It would be necessary to analyze the trophic relationships among the organisms in the food web to determine the secondary consumers accurately.

For more such questions on Secondary consumers visit:

https://brainly.com/question/28631974

#SPJ8

Accrued expenses is the most likely item on the income statement and balance sheet to vary spontaneously with sales (option 3).

Accrued expenses refer to an expense that a company has incurred but has not yet paid for. For example, wages that employees have earned but not yet received payment for, rent, interest, and taxes that have been accrued but not yet paid are all examples of accrued expenses.

Accrued expenses are spontaneous liabilities, which means they vary in proportion to a company's sales volume. The higher the sales, the more the company is likely to owe in accrued expenses. The company must record the accrued expenses as liabilities on the balance sheet and as expenses on the income statement.

Accrued expenses are likely to increase when sales volume increases, and they decrease when sales volume decreases. It means that accrued expenses are the most likely item on the income statement and balance sheet to vary spontaneously with sales.

Learn more about accrued expenses here:

https://brainly.com/question/28659299

#SPJ11

A material that is neither a good conductor nor a good insulator is known as a semiconductor.

Semiconductors are materials whose electrical conductivity lies between conductors and insulators.

They have moderate electrical conductivity, which can be controlled and manipulated by doping or applying external influences such as temperature or voltage.

The most common semiconductor material is silicon.

A conductor is a material that allows electric current to pass through it easily.

It has a low resistance to electric current and a high electrical conductivity. Copper, silver, and gold are examples of good conductors.

An insulator is a material that resists the flow of electric current through it.

They have high resistance and low electrical conductivity.

Rubber, glass, and plastic are examples of insulators.

Examples of semiconductor materials include silicon (Si) and germanium (Ge).

Semiconductor materials are widely used in electronic devices, such as transistors and diodes.

To know more about insulator visit:

https://brainly.com/question/2619275

#SPJ11

Taking into account the definition of dilution, the correct answer is option C): 75 mL of the stock solution are required to prepare 250 mL of a 1.50 M solution.

You have to know that when it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.

Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.

In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.

A dilution is mathematically expressed as:

Ci×Vi = Cf×Vf

where:

In this case, you know:

Replacing in the definition of dilution:

5 M× Vi= 1.5 M× 0.250 L

Solving:

Vi= (1.5 M× 0.250 L)× 5 M

Vi= 0.075 L= 75 mL

In summary, the correct answer is option C): 75 mL of the stock solution are required to prepare 250 mL of a 1.50 M solution.

Learn more about dilution:

https://brainly.com/question/24881505

https://brainly.com/question/16343005

https://brainly.com/question/24709069

Incomplete question. However, I provided a specific example of stewardship of the atmosphere.

Explanation:

First, note that the term stewardship refers to the belief that humans are obligated to take care and look after our environment (which includes the atmosphere.

An example of this is: deciding to change our mode of transportation: What this entails is that we may decide to switch to riding a bicycle to places rather than going by car. By so doing you will be reducing the number of greenhouse gases emitted into the environment as bicycles do not emit harmful gases when used.

One example of an element that can react negatively with gold is fluorine (F).

Fluorine is a highly reactive nonmetal and the most electronegative element on the periodic table. It readily accepts electrons to achieve a stable electron configuration.

When fluorine reacts with gold, it can form a compound known as gold trifluoride (AuF3). Gold trifluoride is a yellow solid that is thermodynamically unstable and decomposes at room temperature.

The reactivity of fluorine towards gold is attributed to the large electronegativity difference between the two elements. Fluorine's strong electron affinity and high electronegativity allow it to oxidize gold by accepting electrons from the gold atoms. This results in the formation of AuF3.

It's important to note that the reactivity of gold with fluorine is relatively uncommon and occurs under specific conditions. Gold's unreactive nature is one of the reasons it is highly valued and widely used in jewelry, electronics, and various other applications.

For more such question on element visit:

https://brainly.com/question/18096867

#SPJ8

Answer: B) Sperm

Explanation:  For lazy gang wya Lol

Answer:

The blue star is the hottest star.

Explanation:

Red stars are cooler than the sun, with surface temperatures of 3,500 K for a bright red star and 2,500 K for a dark red star. The hottest stars are blue, with their surface temperatures falling anywhere between 10,000 K and 50,000 K

Answer: Replacement means a person or thing that takes the place of another; a substitute.