An R-32 vapor-compression system provides 4 tons of cooling, has 10∘C liquid subcooling, 8∘C superheated vapor, an evaporator temperature of 6∘C, and a condensing temperature of 58∘C. The compressor isentropic efficiency is 70%. Neglect all component pressure drops, and determine a. The COP b. The compressor discharge temperature

In water, ionic substances dissolve quickly. This sentence outlines how water molecules are polar nature. A polar covalent molecule is water.

Due to the unequal sharing of electrons between the atoms and the molecule's (side) asymmetrical structure, a water molecule has two poles: a positive charge on the hydrogen pole (side) and a negative charge on the oxygen pole. The water molecule has a curved form, which means that the majority of the negative charge from the oxygen is on one side of the molecule and on the other atoms positive charge from hydrogen is present. As a result, the water molecule can be described as polar.

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On this scenario, the US may consume more than its PPC by specializing in cheese and swapping it for Italian tomatoes.

Italy’s cheese output is lower than that of the United States.Italy cannot consume cheese other than PPC unless these products are supplied by another nation. Through an exchange deal with Italy, the United States can enjoy tomatoes in addition to PPC. Because cheese production in the United States is substantially higher than in Italy, we may assume that the United States can offer this commodity to other nations without jeopardizing its consumption. However, tomato output in the United States is the same as in Italy, but because the United States is a larger country than Italy, tomato consumption in the country may be affected.

As a result, if tomatoes are obtained from another nation, tomato consumption in the United States may surpass the PPC of tomatoes. This may be accomplished through barter, with the United States supplying cheese to Italy and Italy supplying tomatoes to the United States.

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Answer:

919,000 mg CCl4

Explanation:

1 mole of any compound contains 6.023x10^23 molecules of that compound.

Use this relationship as a conversion factor:  (6.022x10^23 molecules)/1 mole

(3.6 x 10^24 molecules of carbon tetrachloride)/((6.022x10^23 molecules)/1 mole)  = 5.98 moles of carbon tetrachloride, \(CCl_{4}\)

The molar mass of   CCl4 is 153.8 grams/mole

(5.98 moles)(153.8 grams/mole) = 919 grams, or 919,000 mg CCl4

Answer:

Cholesterol is a 27 carbon

The equilibrium constant (Ksp) expression for the given equation is as follows: Ksp = [Ca²⁺][OH⁻]²

Where [Ca²⁺] is the concentration of calcium ions in the solution and [OH⁻] is the concentration of hydroxide ions in the solution.

The Ksp value represents the solubility product of calcium hydroxide and is a measure of the extent to which the solid compound dissolves in water to form its constituent ions. A high Ksp value indicates that the compound is highly soluble in water, whereas a low Ksp value indicates that the compound is relatively insoluble.

In summary, the Ksp expression for the given equation is a measure of the solubility of calcium hydroxide in water and is given by the concentration of its constituent ions in the solution.

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The volume of CO₂ generated under condition of STP in the reaction :

CaCO₃   +  2HCl   ----->   CaCl₂   +   H₂O   +   CO₂ is  12.5 mL.

The reaction is given as :

CaCO₃   +  2HCl   ----->   CaCl₂   +   H₂O   +   CO₂
mass of CaCO₃  = 750 mg = 0.75 g

molarity of HCl = 0.100 M

volume of HCl = 25 mL = 0.025 L

moles of CaCO₃  = 0.75 / 100

                            = 0.0075 mol

moles of HCl = 0.100 × 0.025

                       = 0.0025 mol

here HCl is limiting reagent , formation of CO₂ depends on HCl

2 moles of HCl = 1 mole of CO₂

0.0025 mol of HCl = 0.0025 / 2

                               = 0.00125 mol

volume of CO₂ = moles / molarity

                          = 0.00125 / 0.100

                         = 0.0125 L = 12.5 mL

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Answer:

22.4 L

Explanation:

At STP, one mole of gas occupies 22.4 L of volume (molar volume). Note the International Union of Pure and Applied Chemistry (IUPAC) applies a more stringent standard of STP as a temperature of 273.15 K (0 °C, 32 °F) and an absolute pressure of exactly 100,000 Pa (1 bar, 14.5 psi, 0.98692 atm).

Answer:5.3 a

letr

Explanation:

It takes 24 years for 16.0 ng of tritium to decay to the point where 2.0 ng remains.

Tritium has a half-life of 12 years, which means that in each 12-year period, half of the tritium atoms will decay. To calculate the time it takes for a specific amount of tritium to decay, we can use the concept of half-life.

Step 1:

In the first 12 years, half of the tritium will decay, leaving 8.0 ng remaining (16.0 ng / 2).

Step 2:

In the next 12 years (the second half-life), half of the remaining tritium will decay again, leaving 4.0 ng (8.0 ng / 2).

Step 3:

Continuing this pattern, after another 12 years (the third half-life), we have 2.0 ng remaining (4.0 ng / 2).

Therefore, it takes 24 years for 16.0 ng of tritium to decay to the point where 2.0 ng remains.

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Water and carbon dioxide are the byproducts of hydrocarbon burning.

A mixture of hydrocarbon is called a hydrocarbon. The hydrocarbons methane (CH4), ethane (C2H6), and ethyne are examples of (C2H2). These compounds are all hydrocarbons since their corresponding molecular formulas show that they are all solely composed of the elements hydrogen and carbon.

The biggest and most intricate carbon molecules are found in coal. Various hydrocarbons produce different amounts of water and carbon dioxide because their hydrogen to carbon ratios vary. The ratio of charcoal to hydrogen is typically higher in longer, more complicated molecules.

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Answer:

liquid ethanol can be separated from a mixture of ethanol and water by fractional distillation. This method works because the liquids in the mixture have different boiling points. When the mixture is heated, one liquid evaporates before the other.

Explanation:

hope this helps :3

Answer:

Shifting their growing range towards the equator

Explanation:

Maybe will be like that

Answer:

Ability to store water in leafy structures to prevent excess evaporation.

Explanation:

The reason why plants die in hot temperature is the excess evaporation of water, so to prevent the excess evaporation of water, the plants get adaptive to store water in their leaves.

Hope it helps.

Answer:

A. Weathering breaks down rocks; Deposition leaves them in new places.

Explanation:

Weathering is basically the complete process of rocks breaking apart.  In contrast, deposition is when the rocks are moved and carried away from their original place and put in new locations.

Answer:

a

Explanation:

Answer:

Saliva contains amylase which helps digest starch .

Explanation:

you should've googled it instead of waiting 10,000 years for someone to answer. but sometimes googling doesn't always give you the answer you want

Answer:

It can help identify elements quicker.

Explanation:

The ratio of the rate constant for the catalyzed reaction to that for the uncatalyzed reaction can be determined based on the activation energies of the reactions.

The ratio of the rate constant for the catalyzed reaction (k_cat) to that for the uncatalyzed reaction (k_uncat) can be calculated using the Arrhenius equation:

\(\[ \frac{k_{cat}}{k_{uncat}} = \frac{e^{-\frac{E_{a,cat}}{RT}}}{e^{-\frac{E_{a,uncat}}{RT}}} \]\)

Where Ea,cat is the activation energy for the catalyzed reaction, Ea,uncat is the activation energy for the uncatalyzed reaction, R is the gas constant, and T is the temperature in Kelvin.

Assuming that the frequency factor (A) is the same for both reactions, it cancels out when calculating the ratio. Therefore, the ratio of the rate constants is solely dependent on the activation energies.

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The chemical equation for the synthesis reaction of burning magnesium in the presence of oxygen can be summarized as: 2 Mg + O2 → 2 MgO

In this reaction, magnesium (Mg) reacts with oxygen (O2) to form magnesium oxide (MgO). The balanced equation shows that two moles of magnesium react with one mole of oxygen to produce two moles of magnesium oxide.

When magnesium is burned, it undergoes a redox reaction with oxygen. Magnesium atoms lose two electrons to form Mg2+ ions, while oxygen molecules gain four electrons to form O2- ions.

The resulting ions combine to form the ionic compound magnesium oxide (MgO), which is a white solid. The balanced equation reflects the stoichiometry of the reaction, indicating the correct ratio of reactants and products.

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Doubling Earth's atmospheric CO₂ levels would lead to significant and potentially devastating changes to our planet's climate, ecosystems, and human well-being.

If Earth's atmospheric carbon dioxide (CO₂) levels were to double, scientists predict several significant consequences for our planet. Firstly, a major increase in global temperatures would occur due to the greenhouse effect. CO2, being a greenhouse gas, traps heat within Earth's atmosphere, leading to a rise in average temperatures, known as global warming.

This increase in temperature would result in the melting of polar ice caps and glaciers, causing a rise in sea levels. This, in turn, would lead to increased coastal flooding and the potential loss of habitats and infrastructure in low-lying areas. Additionally, weather patterns could become more extreme and unpredictable, with increased occurrences of droughts, storms, and floods, causing negative impacts on agriculture and ecosystems.

Moreover, higher CO₂ levels would lead to ocean acidification, a process wherein CO₂ dissolves in seawater, creating carbonic acid. This change in ocean chemistry would have severe consequences for marine life, particularly for organisms with calcium carbonate shells, such as corals, mollusks, and some plankton species, affecting the entire marine food chain.

Lastly, increased CO₂ levels would impact human health, with higher temperatures exacerbating air pollution, causing respiratory issues, and worsening existing health conditions.

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Answer:

Prokaryotic cells contain DNA, contain ribosomes, and lack a nucleus.

Answer:

Contains DNA

Contains Ribosomes

lacks a nucleus

Explanation: I took the quiz on edge

The mass percentage of Cl⁻ in the solution produced when 3.00g of CaCl₂ is dissolved in 100.0mL of water is 1.86 %.

The total mass of the solution which is produced when 3.00g of CaCl₂ is dissolved in 100.0mL of water is determined as follows:

mass of CaCl₂ = 3.0 g

mass of water = density * volume

mass of water = 1.00 g/mL * 100.0 mL

mass of water = 100.0 g

mass of solution = (100.0 + 3.0) g

total mass of solution = 103.0 g

molar mass of CaCl₂ = (40 + 35.5 * 2) g/mol

molar mass of CaCl₂ = 111 g/mol

mass percentage of Cl⁻ in CaCl₂ = 71/111

mass of Cl⁻ present in 3.0 g of CaCl₂ = 71/111 * 3 = 1.92 g

mass percentage of Cl⁻ in the solution = 1.92/103 * 100%

mass percentage of Cl⁻ in the solution = 1.86 %

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Explanation:

Light can't get produced whilst a chemical reaction.

Answer:

26.78 kJ

Explanation:

To solve the problem, we have to first write the stoichiometric coefficients in the chemical equation:

2P + 3Cl₂ → 2PCl₃

With these coefficients, we have the same number of atoms of each chemical element on both sides: 2 atoms of P, 6 atoms of Cl.

According to the equation, 2 moles of phosphorous (P) react with 3 moles of chlorine (Cl₂), and 574 kJ of energy are released. We have to figure out which is the limiting reactant. For this, we convert the mass into moles by using the molar mass(MM):

MM(P) = 30.9 g/mol

67.04 g P/(30.9 g/mol) = 2.17 mol P

MM(Cl₂) = 35.4 g/mol x 2 = 70.8 g/mol

10.20 g Cl₂/(70.8 g/mol) = 0.14 mol Cl₂

Now, we multiply the actual moles of P (the amount we have for the reaction) by the stoichiometric ratio given by the chemical equation (3 mol Cl₂/2 mol P):

2.17 mol P x (3 mol Cl₂/2 mol P) = 3.25 mol Cl₂

To completely react 67.04 g P, we need 3.25 mol of Cl₂, and we have only 0.14 moles of Cl₂, so the limiting reactant is Cl₂.

Now, we use the limiting reactant to calculate the energy released from the reaction. The energy released per mole of Cl₂ is:

ΔH/(3 mol Cl₂) = -574 kJ/3 mol Cl₂= 191.3 kJ/mol Cl₂

Finally, we multiply the energy released per mole of Cl₂ by the number of moles of Cl₂ we have:

0.14 mol Cl₂ x 191.3 kJ/mol Cl₂ = 26.78 kJ

Answer:

B- why or how because any scientist deals with matter it's relationships ,properties and its composition which can be inferred from the questions why and how

Answer: Your welcome!

Explanation:

All living organisms rely on organic compounds for their carbon and energy needs. Organic compounds are molecules that contain carbon atoms and usually hydrogen, oxygen, and other elements. These organic compounds provide the necessary elements for cellular metabolism and are used to form cell structures and to store energy. Examples of organic compounds used by organisms include carbohydrates (glucose, glycogen, etc.), lipids (fats, oils, etc.), proteins, and nucleic acids (DNA, RNA, etc.).

Answer:

Chemoheterotrophs

Explanation:

Answer:

Rubidium Chloride is an excellent water soluble crystalline Rubidium source for uses compatible with chlorides.

Compound Formula: ClRb

Melting Point: 715 °C

Boiling Point: 1,390 °C

Explanation:

Nitrogen: 2 electron shells and 5 valence electrons

Magnesium: 3 electron shells 2 valence electrons

Answer:

it's A.

Explanation:

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Answer: lactate

Explanation:

The missing circulating energy substrate is lactate. Lactate is a product of anaerobic metabolism and can serve as an energy source in certain conditions, such as during intense exercise or in tissues with high glycolytic activity. It can be converted back into glucose through a process known as the Cori cycle and utilized as an energy substrate by various tissues in the body.