In hot water hydronic systems, water is heated and circulated through pipes to a heat transfer component called a(n) ____________________ unit.
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In hot water hydronic systems, water is heated and circulated through pipes to a heat transfer component called a "heat exchanger" unit.
In hot water hydronic systems, the purpose is to transfer heat from a heat source (such as a boiler or a heat pump) to the desired spaces or objects within a building. The water is heated in the heat source and then circulated through a network of pipes that distribute it to different areas.
The heat exchanger unit is a critical component in this system. Its main function is to facilitate the transfer of heat from the hot water to the surrounding environment. It does this by using a combination of conduction and convection.
The heat exchanger typically consists of a series of pipes or tubes arranged in a way that maximizes the surface area available for heat transfer. The heated water flows through these pipes, and as it does so, it releases heat to the surrounding air or objects.
The heat exchanger unit may be installed in various locations within a hot water hydronic system, depending on the specific design and requirements. It could be located within a central heating system, radiators, baseboard heaters, or even underfloor heating systems.
By using a heat exchanger unit, the hot water in the hydronic system can efficiently transfer its thermal energy to the surrounding environment, providing warmth and comfort to the spaces or objects being heated.
Overall, the heat exchanger unit plays a crucial role in hot water hydronic systems by facilitating the transfer of heat from the water to the desired areas, allowing for effective and controlled heating within a building.
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Question 3 (0.5 points) Successful organisms must be able to do three things: obtain the energy they need to live, produce offspring, and maintain their (not plural answer) A (that is, stay healthy and keep the body and its systems working properly). ▷ View hint for Question 3
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Successful organisms must be able to do three things: obtain the energy they need to live, produce offspring, and maintain their Homeostasis.
Homeostasis refers to the maintenance of a constant internal environment within the body. This is achieved by regulating the levels of various substances in the blood, such as water, salts, and glucose. The body achieves homeostasis through negative feedback loops. These loops work to maintain a stable internal environment by detecting changes and then correcting them.
For example, the body regulates its temperature using a negative feedback loop. When the body temperature rises, sensors in the brain detect this change and send signals to the body to begin cooling itself down. This may happen by sweating or by increasing blood flow to the skin. Once the body temperature has returned to normal, the negative feedback loop is complete and the body stops cooling itself down.
The body also regulates its blood sugar levels using a negative feedback loop. When blood sugar levels rise, sensors in the pancreas detect this change and release insulin. Insulin then helps to transport sugar into cells, where it can be used for energy.
Once blood sugar levels have returned to normal, the negative feedback loop is complete and the pancreas stops releasing insulin. Negative feedback loops are vital for maintaining homeostasis and keeping the body functioning properly.
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how many grams of Fe2O3 are used if 2.88 grams are produced
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The answer you are looking for ---> 1/2 x 0.156 mole Fe2O3 x 159.59 g/mole = 12.45 g Fe2O3.
Is natural gas an explosive substance or flammable substance?
Answers
Answer:
Conditions to Avoid: Natural gas is extremely flammable and explosive; avoid heat, sparks, open flames, and all possible sources of ignition. Heat will increase pressure in containers used to store natural gas.Jun 1, 2015
Answer:
Natural Gas can be explosive or flammable depending on it's concentration in air.
Natural gas has a flammability range of approximately 5 to 15 percent.
Any percentage greater than that is explosive for natural gas.
Hope this helps.
4NH3(g)+6NO(g) yields 5N2(g)+6H2O(l) How many moles NO are required to completely react with 2. 45 mol NH3
Answers
As per the balanced reaction given, 4 moles of ammonia reacts with 6 moles of NO. Therefore, the number of moles of NO required to react with 2.45 moles of ammonia is 3.46.
What is nitric oxide?Nitric oxide is a covalent compound formed from the electron sharing between nitrogen and oxygen atom. Nitric oxide is a common gas found in atmosphere.
NO reacts with ammonia gas produces nitrogen gas and water as per the balanced chemical equation given. It is clear that 4 moles of ammonia reacts with 6 moles of NO.
The number of moles of NO required to react with 2.45 moles of ammonia is calculated as follows:
number of moles of NO = 2.45 × 6 /4 = 3.46.
Therefore, 3.46 moles of NO is required to completely react with 2.45 moles of ammonia.
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what are the monomers and polymers of nucleic acids
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The monomers of nucleic acids are nucleotides and nucleic acids are the polymers of nucleotides.
Nucleic acids are long polymers made up of repeating nucleotide monomers. Deoxyribonucleic acid (DNA) and ribonucleic acid (RNA) are the two types of nucleic acids. Nucleic acids are essential biological molecules that hold genetic information and direct the creation of proteins in living organisms.
Nucleotides are molecules that make up the building blocks of nucleic acids. They're made up of a nitrogenous base, a sugar molecule, and a phosphate group. There are four different types of nitrogenous bases: adenine (A), guanine (G), cytosine (C), and thymine (T) in DNA (Uracil (U) replaces thymine in RNA) .These bases are held together by hydrogen bonds to form base pairs. Adenine and thymine, as well as guanine and cytosine, always match up in DNA. Uracil replaces thymine in RNA.
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A student performed the experiment but varied the volumes used when weighing out the liquids. For the 0% salt solution, the student used 13.2 mL, for the 5% solution the student used 12.9 mL and so on. Assuming everything else was performed precisely andaccurately, will the differing volumes affect the outcome of the experiment?
Answers
Yes, the differing volumes will affect the outcome of the experiment. This is because the concentrations of the solutions will be different from what they should be if the correct volumes were used.
For example, if the 0% salt solution was supposed to be 10 mL but the student used 13.2 mL, the concentration of the solution will be lower than it should be. Similarly, if the 5% solution was supposed to be 10 mL but the student used 12.9 mL, the concentration of the solution will also be lower than it should be.
This will affect the results of the experiment because the solutions will not have the correct concentrations, and therefore the reactions will not occur as they should.
In conclusion, it is important to use the correct volumes when performing an experiment in order to obtain accurate results. Differing volumes can lead to incorrect concentrations and therefore affect the outcome of the experiment.
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Which of these limiting factors is MOST likely to affect low-growing plants in a tropical forest? Group of answer choices air water shelter sunlight
Answers
Answer:
air, water, sunlight
Explanation:
A limiting factor may be defined as a environmental condition or a resource that can limit the plant growth as well as distribution or the abundance of an organism or its population within the ecosystem. The ability of any plant species to grow and spread throughout any geographic area is the direct result of the adaption to its biotic and abiotic components of that region.
Some of the factor that affect the plant growth are : sunlight, air, proper temperature, moisture, nutrients, wind,etc.
The lack of the any one of the above essential component will determine the health of the plant.
proline is an unusal amino acid because its n atom on the alpha carbon is part of a five-membered ring
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Proline is an unusual amino acid because its N atom on the alpha-carbon is part of a five-membered ring. Proline is an amino acid with a pyrrolidine ring in place of a typical amino group.
Proline's amino group is covalently bonded to its side chain and hence cyclized, whereas amino acids have a free amino group.Proline is unique in its behavior and biological roles due to its structure. When compared to other amino acids, the cyclic structure of proline creates severe structural limitations in polypeptides in which it occurs. The side chain of proline is bound to the alpha-amino group, resulting in a unique 5-membered ring structure and loss of the amino hydrogen atom, which reduces proline's ability to form H-bonds in proteins.
As a result, the α-carbon of proline forms a more limited set of dihedral angles than other amino acids, making it harder for proline residues to fit into the interior of protein structures. Because of its cyclic structure, it frequently destabilizes an alpha-helix and creates a kink in the polypeptide chain. Because of this unusual feature of proline, a long answer is required to explain why it is an unusual amino acid.
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for a c-br bond that is oriented with the bromide to the right of the carbon, where does the nucleophile have to attack from?
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The nucleophile has to attack from: A nucleophilic attack often occurs when an electron-rich species (the nucleophile) "attacks" an electron-deficient species (the electrophile, usually a carbocation), forming a new bond between the nucleophile and the carbocation.
Nucleophile (Nuc): A reactant that offers a couple of electrons to form a brand-new covalent bond (i.e. a Lewis base). A nucleophile that shares an electron pair with a proton is generally known as a Bronsted-Lowry base or just a base. Hydroxide ion as a nucleophile in an SN2 reaction.
In chemistry, a nucleophile is a chemical species that paperwork bonds by using donating an electron pair. All molecules and ions with a free pair of electrons or at least one pi bond can act as nucleophiles. due to the fact nucleophiles donate electrons, they're Lewis bases.
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which substance is used for fire proofing agent
Answers
Explanation:
not sure but I say carbon dioxide
Which of the following ions (if equal in concentration) will contribute most to elevating the boiling point of H₂O? A. Fe3+ B. Ca2+ C. All would contribute equally D. Na+
Answers
A. Fe3+. This is because Fe3+ has a higher charge than Ca2+ and Na+, which means it has a stronger attraction to the water molecules and therefore causes more disruption to the water's ability to vaporize.
Additionally, the concentration of Fe3+ ions would need to be much lower than Ca2+ and Na+ ions to have the same effect on the boiling point of water due to its higher charge.
The boiling point elevation depends on the number of ions present in the solution. In this case, if all ions have equal concentration, Fe3+ (A) will contribute most to elevating the boiling point of H₂O, because it has the highest charge and will produce more ions when dissolved in water.
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The service sector in Jessica’s economy is dominant. Which sector is dominating Jessica’s country? Jessica lives in a sector economy. Could be one of the most important occupation in Jessica’s economy.
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The service sector is dominant in Jessica's economy. The service sector refers to the portion of the economy that provides services rather than producing goods.
It includes various industries such as retail, healthcare, education, finance, hospitality, and more. Since the service sector is dominant in Jessica's economy, it means that a significant portion of the economic activity and employment is focused on providing services to consumers or other businesses. This indicates that the country relies heavily on service-based industries to drive economic growth and generate employment opportunities.
Given that Jessica lives in a sector economy, one of the most important occupations in her country would likely be related to the service sector. Occupations such as customer service representatives, healthcare professionals, educators, financial advisors, and hospitality workers could be crucial in driving the economy and meeting the needs of the population.
It is important to note that other sectors like the agricultural and industrial sectors may still exist in Jessica's country, but the dominance of the service sector suggests that it plays a central role in the economy.
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can someone help me please?
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Which of the following substances will form a base when dissolved in water?
A)
SO2
B)
HBr
C)
HCl
D)
KOH
Answers
Answer:
S02
Explanation:
Based on it
it cause the base when dissolving in water
Which best describes the motion of the object between 1 and 4 seconds? The object has decreasing acceleration and increasing velocity. The object has positive acceleration and eventually stops. The object has decreasing acceleration and decreasing velocity. The object has negative acceleration and eventually stops.
Answers
Answer:
D or 4
Explanation:
right on edge 2021
Answer:
d
Explanation:
9. During an experiment the students prepared three mixtures A)Starch in water B) Sodium chloride solution C) Tincture of Iodine. i) Students observed a visible beam of light through mixture A. Why? ii) Tincture of lodTe did not show Tyndall effect. Explain reason. ill) How can you relate particle size to Tyndall effect?
Answers
Answer:
See explanation
Explanation:
Tyndall effect refers to the scattering of light in a solution. Tyndall effect occurs when the size of particles in the solution exceeds 1 nm in diameter. Such solutions are actually called false solutions.
In tincture of iodine, the size of particles in solution is less than 1 nm in diameter hence the solution does not exhibit Tyndall effect. Hence, tincture of iodine is a true solution.
Therefore, if the size of particles in solution exceeded 1nm in diameter, Tyndall effect is observed.
Please answer!! I’ll make brainliest!!
Answers
Answer:
greater than 115 N upwards
Explanation:
1/2 of an oxygen atom can combine with 2/3 of a hydrogen atom true or false
Answers
The statement "1/2 of an oxygen atom can combine with 2/3 of a hydrogen atom" is false because Atoms are the basic building blocks of matter and cannot be divided into smaller parts without breaking down the atom's structure.
An oxygen atom is composed of 8 protons, 8 neutrons, and 8 electrons, and it is not possible to divide an oxygen atom into halves. Similarly, a hydrogen atom consists of 1 proton, 1 electron, and 0 or 1 neutron, and it cannot be divided into thirds.
When atoms combine to form molecules, they do so in specific ratios determined by their chemical properties.
In the case of oxygen and hydrogen, the most common combination is two hydrogen atoms and one oxygen atom, which combine to form a water molecule (\(H_2O\)). This is because the outer electron shells of the oxygen atom and the hydrogen atoms can interact in a way that stabilizes the resulting molecule.
Therefore the given statement is false
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look at each of the atoms in the solid state. What similarities do you see in the solids
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If the proportions of the corresponding sides and angles of two shapes or solids match, then the forms or solids are said to be comparable. Keep in mind that expanding a form results in a comparable shape.
What is solid ?One of the four basic states of matter is solid. The least energetic molecules are those that are tightly packed together and make up solids. A solid's structural stiffness and resistance to surface forces are its defining characteristics.
Because the energy of atoms lowers when they occupy a reasonably organized, three-dimensional structure, a solid develops from a liquid or gas. Solids differ from liquids and gases in that they have particular properties.
Thus, If the ratio of the lengths of the respective radii, heights, base lengths, widths, or any other dimensions of two solids is the same, they are said to be comparable.
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Gasoline has a density of 0.7197 grams per milliliter. Calculate the mass, in grams, of a sample of gasoline with a volume of 48.5 milliliters.
Answers
Answer:
34.9103 or 34.9 g
Explanation:
Remember Density is a broken heart: m/v.
In this scenario (Let x = # of grams in the sample of gasoline),
D = 0.7198 g/mL = x g / 48.5 mL
So,
(0.7198 g/mL) * (48.5 mL) = x g
x g = 34.9103 = 34.9 g (Accounting for Significant Figures)
A certain acid, HA, has a pKa of 6. What is the pH of a solution made by mixing 0.20 mol of HA with 0.30 mol of NaA? b. A certain acid, HA, has a pKa of 6. In the previous problem, you considered a solution made by mixing 0.20 mol of HA with 0.30 mol of NaA. What, now, would the pH be if 0.05 mol of NaOH were added to that solution? If you need to, assume the solution is at 25 oC, where the Kw is 1.0x10-14. c. A certain acid, HA, has a pKa of 6. What is the pH of a solution made by mixing 200 mL of 0.20 M HA (aq) with 300 mL of 0.30 M NaA (aq)? If you need to, assume the solution is at 25 oC, where the Kw is 1.0x10-14. d. A certain acid, HA, has a pKa of 6. In the previous problem, you considered a solution made by mixing 200 mL of 0.20 M HA (aq) with 300 mL of 0.30 M NaA (aq). What, now, would the pH be if 10 mL of 0.50 M HCl were added to that solution? If you need to, assume the solution is at 25 oC, where the Kw is 1.0x10-14.
Answers
In order to determine the pH in the given scenarios, several calculations and considerations need to be taken into account.Firstly, the Henderson-Hasselbalch equation can be used, which relates the pH of a solution to the pKa of the acid and the ratio of its conjugate base to the acid. This equation is pH = pKa + log([A-]/[HA]), where [A-] is the concentration of the conjugate base and [HA] is the concentration of the acid.
What are the calculations and considerations involved in determining the pH in the given scenarios?
The first problem asks for the pH of a solution made by mixing 0.20 mol of acid HA with 0.30 mol of its conjugate base NaA. The pH can be calculated using the Henderson-Hasselbalch equation, pH = pKa + log([A-]/[HA]). Given that the pKa is 6, we can plug in the values and solve for the pH.
The second problem asks for the pH after adding 0.05 mol of NaOH to the previous solution. Since NaOH is a strong base, it will react with the acid HA and form water.
The amount of NaOH added is small compared to the amount of acid, so we can assume that the acid will be fully neutralized. We can calculate the resulting concentration of the acid and its conjugate base and use the Henderson-Hasselbalch equation to find the new pH.
The third problem involves mixing 200 mL of 0.20 M HA with 300 mL of 0.30 M NaA. We need to calculate the concentrations of the acid and its conjugate base after mixing, and then use the Henderson-Hasselbalch equation to find the pH.
The fourth problem asks for the pH after adding 10 mL of 0.50 M HCl to the previous solution. Since HCl is a strong acid, it will completely dissociate and increase the concentration of the acid HA.
We need to calculate the new concentrations of the acid and its conjugate base and use the Henderson-Hasselbalch equation to find the new pH.
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Philip finds this information while doing research about margarine, which is a synthetic food product.
Hydrogenation is a process through which vegetable oil is changed from a liquid into a solid. During hydrogenation, a chemical reaction occurs. Hydrogen is added under pressure to the vegetable oil, resulting in a synthetic form of fat called trans fat. Trans fats typically taste better and can be stored longer than natural vegetable oils. A food product that results from hydrogenation is margarine. The Mayo Clinic website explains that margarines that contain trans fats increase the risk of heart disease and increased levels of cholesterol in the blood. Trans fats also reduce the amount of “good” cholesterol in the blood. Trans fats occur naturally in meat and dairy products. A 2009 report in Advances in Nutrition suggests that trans fats from animal products, such as dairy, beef, and lamb, may have beneficial health effects, including reducing the chance of developing heart disease or cancer. Which conclusion is best supported by the information that Philip gathered?
0 A) Trans fats have little effect on your health.
O B) Experts recommend avoiding trans fats altogether.
O C) Research shows conflicting evidence of the effect of trans fats on human health.
O D) Trans fats produced by hydrogenation have the same overall effect on human health as naturally occur- ring trans fats.
Answers
Answer:
Research shows conflicting evidence of the effect of trans fats on human health.
an archaeologist discovers an ancient wooden bowl. which isotope would most likely be used to determine its age?
a. carbon-12
b. carbon-14
c. uranium-238
d. oxygen-16
please and thank you to anyone who may know the answer.
Answers
Answer:
B
Explanation:
What do elements and compounds have in common? And how do they differ?
I will mark brainliest for the best answer.
WARNING: DON'T PUT LINKS I WILL REPORT YOU!
Answers
Explain how patterns in the periodic table can provide evidence that explains how the structure of each element is different from another.
Answers
The elements are arranged in periods and groups. They are also arranged by the way they react to other chemicals, or the chemicals that are mixed in the element to make it.
The evidence that explains how the structure of each element is different from another is that the elements are arranged in periods and groups.
The periodic table refers to the tabular display of the chemical elements. It should be noted that the periodic table is arranged based on the increasing atomic number of the elements.
The elements that are in the periodic table are also arranged by the way they react to other chemicals. Therefore, the elements that are in a particular group typically have the same characteristics.
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when the sun hits the water the water...
Answers
Answer:
It creates a rainbow
Explanation:
Cause of the reflectiveness of the water it could possibly form another light but more colorful. you can see how it works when its becomes summer, get a water hose and just let it flow. you'll see a miniature rainbow.
Identify the properly written and balanced equation for the precipitation reaction between ammonium sulfide and cobalt(II) chloride. please choose the correct answer from the following choices, and then select the submit answer button. answer choices
A. (NH4)2S+2 CoCl2 → CoS + NH4CI
B. (NH4)2S+ CoCl → COS + 2 NH4CI
C. NH4S + CoCl2 → CoS2 + 2 NH4CI
D. NHS+COCICOS + NH4Cl
Answers
Your answer: A. (NH4)2S + 2 CoCl2 → CoS + 2 NH4Cl. This equation shows that when ammonium sulfide is added to cobalt(II) chloride, a precipitation reaction occurs, resulting in the formation of solid cobalt sulfide and aqueous ammonium chloride.
The properly written and balanced equation for the precipitation reaction between ammonium sulfide and cobalt(II) chloride is A. (NH4)2S+2 CoCl2 → CoS + 2 NH4CI. This equation shows that when ammonium sulfide is added to cobalt(II) chloride, a precipitation reaction occurs, resulting in the formation of solid cobalt sulfide and aqueous ammonium chloride. This equation is balanced because there are an equal number of atoms on both sides of the equation. It is important to use a balanced equation in chemistry to ensure that the reactants and products are in the correct proportions and to accurately calculate stoichiometric ratios.
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2. if you don't add all of the hcl to the test tube because you see all of the mg is used up but you still follow the directions in this lab report to calculate your volume of h2 produced how will it affect your value of r?
Answers
The rate of reaction r is measured by the amount of gas produced at a 10-second interval.
in this reaction magnesium and acids are gradually used up. however acid is in excess so it is mainly a loss of magnesium. that causes a change in the rate.
if the graph of the axis is in y and time in the x-axis. this shows this reaction fastest at the beginning. as the magnesium is used up the rate falls. when the reaction has stopped no more gas is produced.
What is the rate of reaction?The reaction rate or rate of reaction is the speed at which a chemical reaction takes put, characterized as relative to the increase within the concentration of a product per unit of time and to the decrease within the concentration of a reactant per unit of time. Response rates can shift drastically. For case, the oxidative rusting of press beneath the Earth's atmosphere could be a slow reaction that can take numerous a long time, but the combustion of cellulose in a fire could be a response that takes place in divisions of a second. For most responses, the rate diminishes as the reaction proceeds. A reaction's rate can be decided by measuring the changes in concentration over time.To learn more about reaction rate, refer;
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lithium oxide+sulphuric acid
Answers
Answer:
sulfurous acid with lithium hydroxide to form water and lithium sulfite. The balanced reaction equation is b. H2SO3(aq) + 2 LiOH(aq) → 2 H2O(l) + Li2SO3(aq).
li2so4+h20 (hope it helps )
calculate molar mass of H2SO3
Answers
So, the total atomic mass is \(2(1.00794)+32.06+3(15.9994)=\boxed{82.07408 \text{ g/mol}}\)