b. Water has a specific heat of 4.184 J/gºC. If the temperature of 250 g of
water changes from 22.9°C to 14.7°C, how much heat energy was removed
from the water?

Answer:

10km

Explanation:

Answer:

\(\boxed {\boxed {\sf 10 \ kilometers}}\)

Explanation:

Distance is the product of speed and time.

\(d=s \times t\)

The speed of the ship is 5 kilometers per hour. The time is 2 hours.

Substitute the values into the formula.

\(d= 5 \ km/hr * 2 \ hr\)

Multiply. Note that the hours will cancel each other out.

\(d= 5 \ km * 2 \\d=10 \ km\)

The ship covers a distance of 10 kilometers.

Answer:

92.5925925926

Explanation:

8 million divided by the seconds in a day witch is 86400

Answer:

There are 86,400 seconds in a day (60 seconds in a minute, 60 minutes in an hour, 24 hours in a day --- 60x60x24 = 86,400 seconds.

80,000,000 kisses per 86,400 seconds, so 80,000,000/86,400 = number of kisses per second = about 925.9 kisses per second

The student's claim of 4.64 × 10^24 molecules is incorrect, and the correct number of molecules of ammonium acetate used in the reaction is 6.022 × 10^22 molecules.

The mistake the student made is assuming that the molar mass of ammonium acetate directly corresponds to the number of molecules. However, the molar mass of a substance represents the mass of one mole of that substance, not the number of molecules.

To determine the correct number of molecules of ammonium acetate used in the reaction, we need to use Avogadro's number, which relates the number of particles (atoms, molecules, etc.) in one mole of a substance.

Avogadro's number is approximately 6.022 × 10^23 particles/mol. Given that the student used 0.100 mol of ammonium acetate, we can calculate the correct number of molecules by multiplying the number of moles by Avogadro's number:

Number of molecules = (0.100 mol) × (6.022 × 10^23 molecules/mol)

Performing the calculation, we find that the correct number of molecules of ammonium acetate used in the reaction is 6.022 × 10^22 molecules.

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Answer:

higher data rates are

Explanation:

transmitted

as the bandwidth

is more

more antenna gain is possible

To raise the concentration of a 2-liter solution of 30% acid to 50%, 0.8 liters of pure acid should be added. The amount of acid before and after mixing is equated to find the necessary quantity.

Let us assume that x liters of pure acid should be added. The given 2 liters of 30% concentrate is mixed with x liters of pure acid to raise the concentration to 50%.

According to the question, the amount of acid before mixing is:

2 × 0.3 = 0.6 liters of acid

The amount of acid after mixing is (2 + x) × 0.5

The quantity of acid before mixing is equal to the quantity of acid after mixing, hence

0.6 = (2 + x) × 0.50.6/0.5 = 2 + xx = 1.2 - 2x = -0.8

Therefore, x should be equal to 0.8 liters.

Hence, 0.8 liters of pure acid should be added to 2 liters of 30% concentrate to raise the concentration to 50%.

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Answer:

Na

Explanation:

Answer:

It is Rb!!

for plato users

Answer:

Elements are arranged from left to right and top to bottom in order of  increasing atomic number. As, The modern periodic law tells that the Elements in the modern periodic table are arranged by increasing atomic numbers.

Answer:

See below ~

Explanation:

Properties used to arrange elements

Valence bond theory is not used in coordination chemistry because it is not useful in explaining the nature of complex ions and it is limited to describing simple covalent bonds.

Valence bond theory was originally developed to describe covalent bonds between atoms, based on the overlap of atomic orbitals. In coordination chemistry, however, the bonding between a metal ion and ligands is more complex than simple covalent bonds. Valence bond theory cannot explain the nature of complex ions formed between transition metals and ligands and how they interact with each other.

The alternative theory used in coordination chemistry is crystal field theory (CFT) or ligand field theory (LFT). Both of these theories describe how ligands affect the energy of the metal's d-orbitals, which is crucial for understanding the reactivity and properties of coordination complexes.

Therefore, valence bond theory is not useful in coordination chemistry, as it is limited to describing simple covalent bonds and does not account for the complex nature of metal-ligand bonding.

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In this situation, the quartz shows the cleavage property.

Cleavage is the property of a mineral that lets it interrupt easily along precise inner planes (called cleavage planes) when the mineral is struck sharply with a hammer. Fracture is the property of a mineral breaking in a greater or much less random sample and not using a smooth planar surface.

Quartz is a crystal whose whole shape is made from robust silicate bonds. Its construction has no distinct weak aircraft through which it could cut similarly. As an end result, while it breaks, it does now not show cleavage but as a substitute conchoidal fracture. this feature can also be defined as a mineral's amorphous nature.

The way wherein a mineral breaks along smooth flat planes is called cleavage. these breaks arise alongside planes of weak spots inside the mineral's structure. however, if a mineral breaks alongside an irregular floor, it does not have cleavage.

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Thio neutralization rebuilds the disulfide bonds by removing the excess sulfur that was added by the permanent waving solution.

This process involves using a neutralizing solution, which helps to break down the thioglycolate and reduce its reactivity. The neutralizing solution contains an oxidizing agent, such as hydrogen peroxide, which helps to remove the excess sulfur and restore the hair's natural pH balance. By removing the excess sulfur, the disulfide bonds are able to reform, resulting in the desired curl or wave pattern.

This neutralization step is crucial in the permanent waving process to ensure the hair's integrity and prevent any further damage. In summary, thio neutralization helps rebuild the disulfide bonds by removing the excess sulfur, allowing the hair to maintain its new shape.

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Thio neutralization rebuilds the disulfide bonds by removing the excess sulfur that was added by the permanent waving solution.

This process involves using a neutralizing solution, which helps to break down the thioglycolate and reduce its reactivity. The neutralizing solution contains an oxidizing agent, such as hydrogen peroxide, which helps to remove the excess sulfur and restore the hair's natural pH balance. By removing the excess sulfur, the disulfide bonds are able to reform, resulting in the desired curl or wave pattern.

This neutralization step is crucial in the permanent waving process to ensure the hair's integrity and prevent any further damage. In summary, thio neutralization helps rebuild the disulfide bonds by removing the excess sulfur, allowing the hair to maintain its new shape.

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Thio neutralization rebuilds the disulfide bonds by removing the excess sulfur that was added by the permanent waving solution.

This process involves using a neutralizing solution, which helps to break down the thioglycolate and reduce its reactivity. The neutralizing solution contains an oxidizing agent, such as hydrogen peroxide, which helps to remove the excess sulfur and restore the hair's natural pH balance. By removing the excess sulfur, the disulfide bonds are able to reform, resulting in the desired curl or wave pattern.

This neutralization step is crucial in the permanent waving process to ensure the hair's integrity and prevent any further damage. In summary, thio neutralization helps rebuild the disulfide bonds by removing the excess sulfur, allowing the hair to maintain its new shape.

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The enthalpy change of the reaction is 148.4 kJ/mol.  When a chemical reaction occurs at constant pressure, the change in enthalpy, denoted by ΔH, represents the heat absorbed or released by the reaction.

What is Enthalpy ?

Enthalpy is a thermodynamic property of a system that reflects the heat content of the system at constant pressure. It is denoted by the symbol H and has units of joules (J) or kilojoules (kJ). Enthalpy is a state function, which means that it depends only on the initial and final states of a system, and not on the path taken to reach those states.

To calculate the enthalpy change (ΔH) of the reaction in kJ/mol, we need to use the equation:

ΔH = q / n

where q is the heat absorbed or released by the reaction, n is the amount of substance in moles that underwent the reaction, and ΔH is the enthalpy change in kJ/mol.

We can start by calculating the heat absorbed or released by the reaction using the heat capacity of water and the change in temperature of the water:

q = m × C × ΔT

where m is the mass of water, C is the specific heat capacity of water (4.184 J/g°C), and ΔT is the change in temperature of the water.

Substituting the given values, we get:

q = (109 g) × (4.184 J/g°C) × (25.7°C - 13.2°C) = 5619.9 J

We can convert this to kilojoules (kJ) by dividing by 1000:

q = 5.62 kJ

Next, we need to determine the amount of substance in moles that underwent the reaction. From the given information, we know that 0.038 mol of the unknown substance was consumed.

Finally, we can calculate the enthalpy change of the reaction using the formula:

ΔH = q / n = (5.62 kJ) / (0.038 mol) = 148.4 kJ/mol

Therefore, the enthalpy change of the reaction is 148.4 kJ/mol.

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To calculate the ΔH∘rxn for the reaction C2H4(g) + H2(g) → C2H6(g), use the following equation: ΔH∘rxn = [ΔH∘f (C2H6) - ΔH∘f (C2H4) - ΔH∘f (H2)]/2.

The standard enthalpy of formation for C2H4 is -52.94 kJ/mol, for H2 it is 0 kJ/mol, and for C2H6 it is -84.68 kJ/mol. Plugging in these values into the equation yields ΔH∘rxn = -66.81 kJ

The enthalpy change required to produce one mole of a compound from elements in their standard states is known as the standard enthalpy of formation (Hf). The standard states represent the shape an element would take at 1 bar of pressure and 25 °C

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Emerging scientific ideas are new theories or ideas that are gaining attention in the scientific community, but have not yet been fully accepted or confirmed.

Emerging ideas refer to the new and innovative ideas or theories that have yet to gain full scientific acceptance. While a scientific consensus is a view or theory that has been universally accepted and confirmed by multiple experiments or research, an emerging scientific idea is a new and unproven theory or idea that is gaining attention in the scientific community. These emerging ideas may also be referred to as scientific hypotheses. In contrast to scientific consensus, emerging scientific ideas have not yet been subjected to rigorous testing and confirmation.

They are generally proposed to explain new observations or experimental results, which have not yet been fully understood or explained by established scientific theories. Emerging scientific ideas can have the potential to challenge the current scientific consensus. If an emerging scientific idea is found to be valid, it can ultimately lead to the establishment of a new scientific consensus. For example, the emerging scientific idea of the Higgs boson particle led to the discovery of a new field in particle physics, which is now an established scientific consensus.

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Answer: CaCO3 + 2HNO3 -> Ca(NO3)2 + H2O + CO2

Explanation:

Answer:

Tin bromine = Snbr2

aluminum fluorate = AlFe3

iron oxide = Fe2o3

potassium chloride = KCL or 2KCL = K2CL2

All Pairs are correct

Answer:

D

Explanation:

WOOOOOO

The statement which best compares DNA and RNA with regard to the process of protein production is that RNA leaves the nucleus during the process and DNA remains in the nucleus.

DNA is a hereditary material which is present in human beings as well as all other living organisms.  Every cell which is present in an organism's body has DNA  which is the same. Most of the DNA is situated in the cell's nucleus  and small amount of it can be found in the cell's mitochondria as well.

Information which is stored in DNA is stored as codes made up of four chemical bases namely, adenine, thymine , cytosine and guanine.Human DNA consists of 3 billion bases .The order of the bases determines information which is required for building and maintaining an organism.

DNA bases are capable of pairing up with each other. Adenine pairs with thymine and guanine pairs up with cytosine .Each base is also attached to a sugar molecule  and a phosphate group. A base, phosphate  sugar are together called as nucleotides.

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C and D

The elements of the periodic table which posses similar properties they  are, Be (beryllium), Mg (magnesium), Ca (calcium), Sr (strontium), and B (boron), Si (silicon), Ge (germanium), As (arsenic).

The periodic table is a science chart that displays chemical elements in order of atomic number.

An element is made up of atoms with the identical count of protons in their nuclei as the other atoms in the element.

It is know that if any elements have identical number of valence electrons then such atom will be kept in identical group of the periodic table that's why Be, Mg and Ca will be kept in same group and B , Si and Ge will be kept in same group.

Therefore, on the basis of valence electron, elements will be kept in periodic table.

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A Hydrogen bond link binds a collection of water molecules.

While hydrogen bonds connect two water molecules, covalent bonds link the atoms in a single water molecule.

In the case of water, hydrogen bonds form between neighboring hydrogen and oxygen atoms of adjacent water molecules. The attraction between individual water molecules creates a bond known as a hydrogen bond.

When two atoms exchange one or more pairs of electrons, a covalent connection is created. These electrons are being drawn to the two atomic nuclei at the same time. A covalent bond is created when the difference between the electronegativities of two atoms is too small for an electron transfer to occur and produce ions.

Hence, it can be concluded that water molecules are held together by covalent bonds.

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The density of air is approximately 1.18 g/L, as the earth's atmosphere has an average molar mass of 29.00 mol and a surface temperature of 298.0 K.

To find the density of air, we can use the ideal gas law equation, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.
Since we are given the pressure (1.000 atm) and temperature (298.0 K), we can rearrange the equation to solve for the number of moles. Rearranging, we get n = PV/RT. Plugging in the given values, we have n = (1.000 atm * V) / (0.0821 L·atm/(K·mol) * 298.0 K).

Next, we can calculate the mass of air by multiplying the number of moles by the molar mass. The molar mass of air is given as 29.00 g/mol. Thus, the mass of air is equal to n * molar mass = (1.000 atm * V * 29.00 g/mol) / (0.0821 L·atm/(K·mol) * 298.0 K). Finally, we can find the density of air by dividing the mass by the volume:

density = mass/volume = ((1.000 atm * V * 29.00 g/mol) / (0.0821 L·atm/(K·mol) * 298.0 K)) / V. Simplifying this expression, we find that the density of air is approximately 1.18 g/L.

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Answer:

5.9e-5

Explanation:

Answer:

The ocean is made up of salt water, which is a combination of fresh water, plus minerals collectively called "salts." These salts aren't just sodium and chloride (the elements that make up our table salt), but other minerals such as calcium, magnesium, and potassium, among others.

Explanation:The answer is since particles can be found in ocean water It is a compound, since it results from the combination of elements It is a solution

A polymerization reaction that produces a smaller molecule as a by-product is known as a condensation polymerization.

In condensation polymerization, two monomer molecules react with each other to form a larger polymer molecule and a smaller by-product, usually water or a simple organic molecule. This type of polymerization reaction is common in the synthesis of various polymers, such as polyesters, polyamides, and polyurethanes.

To describe condensation polymerization further, it involves the formation of a covalent bond between the monomer molecules along with the elimination of a smaller molecule, such as water, methanol, or hydrogen chloride. This process can continue to produce long polymer chains, with the by-product being eliminated in each step of the reaction.

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Answer:

C) H+(aq) + OH-(aq) ---》 H2O(aq)

Answer:

NH₃ is bitter and has a pH above 7

Compounds that have a pH above 7 are known as bases. Properties of bases include:

Compounds that have a pH below 7 are known as acids. Properties of acids include:

The first three compounds are acids. Their names are:

Phosphoric acid (H₃PO₄)

Nitric acid (HNO₃)

Hypochlorous acid (HClO)

The fourth compound is a ammonia (NH₃) which is a common base and therefore has a pH above 7, and tastes bitter.

Each crew member receives three wholesome meals daily along with snacks. The food for each astronaut is kept onboard the Shuttle and is given a unique color dot to identify it.

This is further explained below.

Generally, Being bigger than only Mercury, Mars is the second-smallest planet in the Solar System and is located four planets from the Sun. The Roman god of battle is the inspiration for the name of Mars in English.

It provides each member of the crew with three meals that are well-balanced, in addition to snacks. On board the Space Shuttle is where all of the astronauts' food is kept, and each individual box has a colorful dot that identifies it.

In conclusion, For example, traveling to Mars and returning may take more than three years and need the supply of thousands of kg of food. If the crew of four were to consume merely three meals per day while on their three-year voyage to Mars, they would need to bring more than 24,000 pounds (10,886 kilograms) of food with them.

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Drip irrigation is the ideal irrigation system for use with vegetable gardens, flowers, trees, and other watering needs. A drip irrigation system for gardens helps you save time, money, and water.

In those pots lacking drainage holes, a layer of stones is used as a form of drainage layer. By using this method, surplus water might go from the soil and, consequently, the roots of your plant, into the area with the pebbles.

A drip system that has been set up correctly will operate automatically at a certain time of day for a specific duration.

Therefore, a) use the water to wash the car. b) Often used for transpiration to create a suction force, creating a transpiration pull. c) Ayan values water, conserving it and giving the most efficient and optimum function.

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pCa when 35 mL of 0.009 M Cat2 is titrated with 0.022 M EDTA = 8.442. Balanced chemical equation when EDTA is added to the Ca²⁺ solution, the equation is shown below: Ca²⁺+ EDTA⁴⁻ → CaEDTA²⁻.  Hence, the correct option is d)10.6

Calculation of pСa  when 35 mL of 0.009 M Cat2 is titrated with 0.022 M EDTA (as for EDTA at pH=10 is 0.35) in a solution buffered to a constant pH= 10 when the volume of EDTA added is 48 mL is shown below: Given, Volume of Ca2+ = 35 ml

Concentration of Ca²⁺ = 0.009 M, Volume of EDTA added = 48 ml

Concentration of EDTA = 0.022 M,

pH = 10KCaY-2

= 5.0 x 10¹⁰

To calculate the pCa we have to follow these steps:

First, write down the balanced chemical equation for the reaction that occurs when EDTA is added to the Ca²⁺ solution, the equation is shown below: Ca²⁺+ EDTA⁴⁻ → CaEDTA²⁻

Kf = [CaEDTA²⁻] / ([Ca²⁺] [EDTA⁴⁻])

Initial concentration of Ca²⁺ = 0.009 M

Initial volume of Ca²⁺ = 35 ml, Initial amount of Ca²⁺ = 0.009 × 35

= 0.315 mmol

Final volume of Ca²⁺ = 35 + 48

= 83 ml

Thus, final concentration of Ca²⁺ = 0.315 / 83

= 0.003795 M

In the presence of excess EDTA, the entire amount of Ca²⁺ reacts with EDTA.

Thus,[EDTA⁴⁻] = 0.022 × 48 / 1000

= 0.001056 mol[Ca²⁺]

= 0.003795 mol,

Kf = 5 × 10¹⁰

We have to calculate the [CaEDTA²⁻] at the end point and then convert it into [Ca²⁺] to calculate pCa. Using the equation of equilibrium constant ;Kf = [CaEDTA²⁻] / ([Ca²⁺] [EDTA⁴⁻])

Here,[CaEDTA²⁻] = unknown[Ca²⁺]

= 0[EDTA]

= 0.001056 mol/L

When the end point is reached, all Ca²⁺ is reacted with EDTA to form CaEDTA²⁻.

Thus, moles of EDTA⁴⁻ used = 0.003795 × 83

= 0.315 mmol

Moles of CaEDTA²⁻ formed = 0.315 mmol

Thus, [CaEDTA²⁻] = moles of CaEDTA²⁻ formed / volume

= 0.315 / 83

= 0.003795 M

Now, substituting these values in the equilibrium constant expression;5 × 10¹⁰ = [0.003795] / [(0.001056) (0)]

Thus, [Ca²⁺] = [CaEDTA²⁻]

= 3.607 × 10⁻⁹ M

We know that pCa = -log [Ca²⁺]

Thus, pCa = -log 3.607 × 10⁻⁹

= 8.442 (approx)

Hence, the correct option is d)10.6

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There must have been 0.10mol of \(C_{2} H_{2} O\) in the container at the beginning.

 \(C_{2} H_{2} O\) + \(2O_{2}\) = \(2CO_{2}\) + \(H_{2} O\)

The above reaction makes it quite evident that 1 mol of \(C_{2} H_{2} O\) combines to create 2 mol of \(CO_{2}\) and \(O_{2}\) is given in excess that \(C_{2} H_{2} O\) alone controls a product's formation. Therefore, here, O is an excess reactant and \(C_{2} H_{2} O\) is a limiting reactant.

It takes 6 times as much \(C_{2} H_{2} O\) to produce 1 mol of \(CO_{2}\) from 0.05 mol of \(C_{2} H_{2} O\).

Now, 0.6 divided by 6 mol of reactant is required for 0.60 moles of \(CO_{2}\)to produce, which translates to

moles of \(C_{2} H_{2} O\) = 0.6/6 = 0.1 mol .

Therefore, \(C_{2} H_{2} O\) must have been present in the container in an initial concentration of 0.10mol.

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Answer: four different types!!!!

Explanation: