how much heat must a 30.0 g sample of water absorb to raise its temperature from 11.0 ∘c to 62.0 ∘c ? (for water, cs=4.18j/g⋅∘c .)

When refrigerant is in a high-pressure, high-temperature state, it enters the metering device. The refrigerant is then changed to a low-pressure, low-temperature state as a result of the metering device. As a result, the refrigerant will expand and the heat will be absorbed as the temperature decreases.

The metering device is a component in a refrigeration or air conditioning system that ensures that the correct amount of refrigerant is delivered to the evaporator. The device functions as a flow control, reducing the refrigerant's pressure before it reaches the evaporator. The metering device may be a simple capillary tube, an orifice, an automatic expansion valve (AEV), or a thermostatic expansion valve (TXV). The capillary tube is the simplest and least expensive metering device. It's just a small copper tube that's thin and long. The AEV is a constant pressure valve that maintains a consistent pressure drop across it, allowing it to regulate the refrigerant flow. A thermostatic expansion valve is the most sophisticated metering device, as it can sense the temperature at the evaporator outlet and adjust the refrigerant flow accordingly.

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The structure of the repeating unit of the polymer (HNCH₂CH₂NHCOCH₂CO).

The repeating units arise directly from the end-to-end bonding of many vinyl chloride molecules. The molecules that make up a polymer are called monomers. Each vinyl chloride monomer molecule contributes a CH2 group that is single-bonded to the CHCl moiety. They consist of basic building blocks, so-called monomers, the basic building blocks of polymers, which are repeated many times in each molecule.

In many biopolymers, the repeating units of the macromolecules do not have the same structure as the monomers. This is because small molecules such as water are separated from the monomer during incorporation into the polymer. Polymers are composed of different molecules that combine to form long chains. In other words, polymers are useful chemical substances made up of repeating units.

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Once we have these values, we can use the Nernst equation and the standard Gibbs free energy equation to determine the equilibrium constant.

To calculate the equilibrium constant for the reaction Fe + CuSO4 ⇌ FeSO4 + Cu at 25°C,

we need to know the standard reduction potentials (E°) for the half-reactions involved.

However, you mentioned "e°(op/fe)" in your question, which seems incomplete or contains a typo.

To proceed with the calculation, we need the standard reduction potentials for the Fe and Cu ions.

Once we have these values, we can use the Nernst equation and the standard Gibbs free energy equation to determine the equilibrium constant.

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Answer:

B. is your correct answer

Explanation:

Answer: Magnesium loses two electrons whilst sulfur gains tw

Answer:

Mechanical Sound Waves

A mechanical wave is a wave that depends on the oscillation of matter, meaning that it transfers energy through a medium to propagate. These waves require an initial energy input that then travels through the medium until the initial energy is effectively transferred. Examples of mechanical waves in nature include water waves, sound waves, seismic waves and internal water waves, which occur due to density differences in a body of water. There are three types of mechanical waves: transverse waves, longitudinal waves, and surface waves.

Why is sound a mechanical wave? Sound waves move through air by displacing air particles in a chain reaction. As one particle is displaced from its equilibrium position, it pushes or pulls on neighboring molecules, causing them to be displaced from their equilibrium. As particles continue to displace one another with mechanical vibrations, the disturbance is transported throughout the medium. These particle-to-particle, mechanical vibrations of sound conductance qualify sound waves as mechanical waves. Sound energy, or energy associated with the vibrations created by a vibrating source, requires a medium to travel, which makes sound energy a mechanical wave.

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Answer: 0.0054 s

Explanation: There is an inverse relation between the frequency  and the period  of a wave (a sound wave in this case):

T=1/F

Where f = 1.85 (10)² H z

Hence : T = 1/1.85 (10)² H z T =0.0054s

Explanation:

The reaction is CaCO

3

+2HCl→CaCl

2

+H

2

O+CO

2

.

Thus, 2 moles of HCl reacts with one mole of calcium carbonate to produce one mole each of calcium chloride, water and carbon dioxide respectively.

Hence, 3 moles of HCl will react with excess of calcium carbonate to produce 3×

2

1

=1.5 mol of carbon dioxide

Our current understanding of the atom is based on Dalton's early 19th-century idea of atomism, which was developed from meteorological investigations. John Dalton was just a meteorologist, an expert on color blindness, and a teacher, but he will be most widely recognized for creating the idea of atomism.

A scientist is someone who meticulously gathers data and uses it to develop theories, test those hypotheses, and further knowledge and understanding. Despite the fact that the name "scientist" predates Aristotle by more than two millennia, he is frequently referred to as the first scientist. He invented the methods of reasoning, observation, inquiry, and demonstration in Greece in the fourth century BC.

Because they provide specialized explanations for how the world functions, scientists play a crucial role in society. Science is a powerful tool for survival, despite the fact that it doesn't always provide us with joy, and humans have spent considerable time starting to figure out how to do both.

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The conversion of the following Fahrenheit temperatures to the Celsius and Kelvin scales are as follows:

a. –459°F, an extremely low temperature = -273 °C; 0 K

b. –40.°F, the answer to a trivia question = -40°C; 233.15 K

c. 68°F, room temperature = 20°C; 293.15 K

d. 7 × 10⁷ °F, temperature required to initiate fusion reactions in the sun = 3.85 × 10⁷ °C; 3.85 × 10⁷ K

a. –459°F, an extremely low temperature

When we have to convert a given temperature from Fahrenheit to Celsius, we use the following formula:

F = 9/5 C + 32

Where C is the Celsius temperature and F is the Fahrenheit temperature.

(i) To convert -459°F to Celsius, we have to put the value in the above formula and get the Celsius temperature.

F = 9/5 C + 32

-459 = 9/5 C + 32

C = (-459 - 32) × 5/9 = -273 °C is the Celsius temperature of -459°F

(ii) To convert -459°F to Kelvin, we add 273 to the Celsius temperature.

K = C + 273

K = -273 + 273 = 0 K is the Kelvin temperature of -459°F.

b. –40.°F, the answer to a trivia question

(i) To convert -40°F to Celsius, we use the given formula.

F = 9/5 C + 32

-40 = 9/5 C + 32

C = (-40 - 32) × 5/9 = -40°C is the Celsius temperature of -40°F.

(ii) To convert -40°F to Kelvin, we first convert the Celsius temperature to Kelvin by adding 273.15.

K = C + 273.15

K = -40 + 273.15 = 233.15 K is the Kelvin temperature of -40°F.

c. 68°F, room temperature

(i) To convert 68°F to Celsius, we use the given formula.

F = 9/5 C + 32

68 = 9/5 C + 32

C = (68 - 32) × 5/9 = 20°C is the Celsius temperature of 68°F.

(ii) To convert 68°F to Kelvin, we first convert the Celsius temperature to Kelvin by adding 273.15.

K = C + 273.15

K = 20 + 273.15 = 293.15 K is the Kelvin temperature of 68°F.

d. 7 × 10⁷ °F, temperature required to initiate fusion reactions in the sun

(i) To convert 7 × 10⁷ °F to Celsius, we use the given formula.

F = 9/5 C + 32

7 × 10⁷ = 9/5 C + 32

C = (7 × 10⁷ - 32) × 5/9 = 3.85 × 10⁷ °C is the Celsius temperature of 7 × 10⁷ °F.

(ii) To convert 7 × 10⁷ °F to Kelvin, we first convert the Celsius temperature to Kelvin by adding 273.15.

K = C + 273.15

K = 3.85 × 10⁷ + 273.15 = 3.85 × 10⁷ K is the Kelvin temperature of 7 × 10⁷ °F.

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According to the information of the graph we can infer that if the water were cooled to 5°C the reaction time would be close to 30 seconds.

To establish what would the reaction time be if the water were cooled to 5°C we have to analyze the information of the graph specially the trend. In this case, we have to take into account where are located the point that relate time and temperature.

In this case, the trend is more time with less temperature. So if the water were colled to 5°C, the time would be close to 30 seconds.

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Answer: False

Explanation: Endothermic means it absorbs heat energy.

Both molecules have two chiral centers, one at each point of attachment for a hydroxyl group.

According to a general definition, stereoisomers are isomers with the same composition (i.e., the same components), but different orientations in space. Enantiomers and diastereomers are the two different types of stereoisomers.

X = \(2^{n}\), where n is the total number of stereogenic atoms in the molecule, is the formula for calculating the maximum number of stereoisomers. The maximum number of stereoisomers can be accurately determined by the formula X = \(2^{n}\), but in cases of great symmetry, it cannot determine the actual number.

Both molecules have two chiral centers, one at each point of attachment for a hydroxyl group.  It is not possible to have a stereoisomer of 2,3-pentanediol with a plane of symmetry,  while there is one stereoisomer of 2,4-pentanediol with a plane of symmetry.  The plane of symmetry reduces the possible number of stereoisomers.

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Answer:

Of the many processes involved in the water cycle, the most important are evaporation, transpiration, condensation, precipitation, and runoff.

Explanation:

Answer:

53.11  × 10²³ molecules of CO₂

Explanation:

Given data:

Mass of CO₂= 388.1 g

Number of molecules = ?

Solution:

Number of moles of CO₂:

Number of moles = mass/molar mass

Number of moles = 388.1 g/ 44 g/mol

Number of moles = 8.82 mol

Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ molecules

8.82 mol × 6.022 × 10²³ molecules / 1 mol

53.11  × 10²³ molecules of CO₂

Protein hydrolysis leads to amino acids. These amino acids, when heated, will decompose into carbon dioxide and ammonia.

It is the goal of protein hydrolysis to dissolve peptide bonds and increase the amount of free amino acids and carboxyl groups. The resulting hydrolysate is easier to digest and more soluble (Contreras et al., 2019). We present the protein composition of six important agricultural leftovers. A single enzyme (such as trypsin) or a number of enzymes can hydrolyze proteins (e.g., a mixture of proteases known as Pronase, pepsin and prolidase). The protein source and level of hydrolysis influence the choice of enzymes.

which molecule could be hydrolysed into amino acids?

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The statement that is true about the molarity of the solution is that 5.0 moles of a solute is dissolved in 1.0L of solution (option D).

Molarity is the concentration of a substance in solution, expressed as the number of moles of solute per litre of solution.

The molarity or concentration of a solution is a function of the number of moles of solute it contains and the volume of the solvent it is dissolved in.

This suggests that if a solution has a concentration of 5.0M, it has a solute of 5.0moles dissolved in 1.0L of solvent.

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Gravity, as a fundamental force of nature, is influenced by several factors. The following are some of the key factors affecting gravity:

Answer:

well to me it is called natural energy

Explanation:

Based on the information provided, it's possible to determine that the identity element in question is an element with atomic number 20, Calcium (Ca). Calcium has 2 electrons in the K-shell, 8 electrons in the L-shell, and 5 electrons in the M-shell.

Answer:

a

Explanation:

a!!$!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer:

Oxygen

Explanation:

From the periodic table, you can see that the atomic mass of Oxygen is 15.999 (16), however, Carbon's mass is 12.011 (12).

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The given reaction is a dehydrohalogenation reaction. The following reaction depicts the dehydrohalogenation of 3-bromopentane:Thus, 3-bromopentane gives the alkene shown as the major product of the reaction.

Dehydrohalogenation is an elimination reaction, which involves the removal of a proton from the β-carbon, and the halide ion from the α-carbon of the alkyl halide. The removal of the proton and halide ion from the adjacent carbons forms a pi bond.  This type of reaction gives an alkene as the final product.

Therefore, the alkyl bromide which can give the alkene shown as the major product of the following reaction is the one which possesses adjacent beta-hydrogen atoms.

The bromoalkane shown in the reaction below has three beta-hydrogens so that 3- bromopentane will give 2-pentene as the major product. The following reaction depicts the dehydrohalogenation of 3-bromopentane:Thus, 3-bromopentane gives the alkene shown as the major product of the reaction.

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For a  concentration of  is initially 0.150 M before it proceeds to equilibrium, the equilibrium concentration of B  is mathematically given as

x=3.0*10^{-7}m

Generally, the equation for the  change in Gibbs free energy   is mathematically given as

dG=-RTInK

Therefore

31.5*10*^{3}=-(8.314)(298)(ink)

K=3*10^(-6)

Eqution

A--->B

K=x/0.1-x

x=3.0*10^{-7}m

In conclusion, the equilibrium concentration

x=3.0*10^{-7}m

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Answer:

4.21

Explanation:

use Avogadro's number

6.023 x 10^23

multiply this by 7 because you want to find 7 moles :

6.023 x 10^23 x 7 = 4.21

Answer:

to protect astronauts from dieing from no air or presurre

Explanation:

Answer:

3.0x10¹⁹ atoms

Explanation:

First we convert 10 mg of mercury into grams:

Then we convert 0.01 g of mercury into moles, using its molar mass:

Then we convert moles into number of atoms, using Avogadro's number:

1/4  temperature must give Mass of nitrogen at 0°c heated so that both it volume and pressure will be double.​

To double both the volume and pressure of a given mass of nitrogen at 0°C, we can utilize the combined gas law, which relates the initial and final states of a gas. The combined gas law is expressed as:

(P1 * V1) / T1 = (P2 * V2) / T2

Where P1 and P2 are the initial and final pressures, V1 and V2 are the initial and final volumes, and T1 and T2 are the initial and final temperatures.

Since we want to double both the volume and pressure, we can set P2 = 2P1 and V2 = 2V1. Plugging these values into the combined gas law equation, we get:

(2P1 * 2V1) / T1 = P1 * V1 / T2

Simplifying the equation, we find:

4P1V1 = P1V1 / T2

Cancelling out the common terms, we have:

4 = 1 / T2

Rearranging the equation, we find:

T2 = 1 / 4

Therefore, to double both the volume and pressure of the given mass of nitrogen at 0°C, it must be heated to a temperature of 1/4 or 0.25 times its initial temperature.

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Answer:

Filtration, Sifting and Decanting

Explanation:

Heterogenous mixtures can be seperated by filtration and sifting (Also known as sieving). Sifting is the process of parting a mixture using a sieve. Sifting is used to separate solid mixtures that contain molecules of varying sizes. Filtration is the process of separating a liquid from an insoluble solid. A common example is using a funnel and a coffee filiter to seperate the liquide from the insoluable solid. Although there are many other methods for filtration. You can also separate mixtures by decantation. Decantation is the process of separating a liquid from a solid/liquid by removing the liquid layer at the top from the layer of solid/liquid below.