Expressing Opinions: Compare the advantages and disadvantages of solar heating systems. What do you think their overall benefits are, compared with those of other heating systems?
Answer: Solar heating systems are energy efficient, but the amount of heating they can accomplish would not be very much in cold climates. Overall, it seems they could be put to good use in a lot of places in the world and could save a lot of energy.
Explanation:
because thats how science works ig
5. How many hydrogen atoms are in 1 gallon of octane?
Density of octane= 0.7028 g/mL, 3780 mL = 1 gal
The chemical formula for octane, C8H18, is an alkane and a hydrocarbon. Its condensed structural formula is CH3(CH2)6CH3. The amount and location of branching in the carbon chain determine the various structural isomers of octane.
Carbon is represented by the letter C, octane by the formula C8H18. As a result, there will be 8 moles of carbon for every mole of C8H18.
Utilizing the molar mass of octane, convert 20 kg of octane to moles of octane.
Octane's molar mass is calculated as (8*12.011)+(18*1.008)=114.23 g/mole, where 8 and 18 are the molecule's atoms and 12.011 and 1.008 are the carbon and hydrogen atoms' individual molar masses.
20kg C8H18*1000g/kg*mole
C8H18/114.23g C8H18 = 175.1 moles of octane.
Put that quantity of moles into moles of carbon now:
1400.8 mole C is equal to 175.1 mole C8H18 * (8 mole C/mole C8H18).
Now keep in mind that a mole of a specific element equals 6.022*1023 atoms.
As a result, your final answer of 8.4*1026 atoms, or 1400.8 mole C, is identical to 1400.8*(6.022*1023) atoms C.
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The heat capacity of solid iron is 0.447 Jewels per gram in celsius. If the same quantity of energy as in #3 were transferred to a 450g chunk of iron at 20 Celsius, what would be the final temperature?
After transferring 65 kJ of heat, the iron's final temperature will be 343.14.
What is specific heat?The amount of heat necessary to increase the temperature of 1 g of a substance by 1 degree Celsius is known as the specific heat.
One can provide the specific heat by:
Q = mcΔT
Q equals 65 kJ of specific heat
0.447 J/g is the heat capacity, or c.
450 g is the iron's mass, or m.
ΔT = temperature change, or final temperature minus initial temperature.
ΔT=20 - final temperature
The values being entered into the equation:
65000 J = 0.447 J/g 450 g
(Final temperature - 20) 65000 J = 201.15
Temperature at the end minus 20 = 323.14
Temperature at the end: 343.14.
After transferring 65 kJ of heat, the iron's final temperature will be 343.14.
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Using the standard enthalpies of formation, what is the standard enthalpy of reaction? co(g) h2o(g)⟶co2(g) h2(g)
The standard enthalpy of reaction is - 41.166 kJ/mol
What is enthalpy of reaction ?
For a chemical reaction, the enthalpy of reaction is the difference in enthalpy between products and reactants
What is enthalpy of formation ?
The enthalpy of formation of a substance is defined as heat change i.e heat evolved or absorbed when 1 mole of substance is formed from its elements under given conditions of temperature and pressure
The standard enthalpy of reaction is
ΔH° reaction = Σ ΔH°f ( products) - Σ ΔH°f (reactants)
= [ΔH°f (CO₂ g) + ΔH°f (H₂ g)] - [ ΔH°f (CO g) + ΔH°f (H₂O g)]
= [ -393.509 + 0 ] - [(-110.525) + (-241.818) ]
= -393.509 + 352.343
= - 41.166 kJ/mol
Thus we can conclude that the standard enthalpy of reaction is - 41.166 kJ/mol
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Note: The correct question for the above solution is
Using the standard enthalpies of formation, what is the standard enthalpy of reaction? CO(g) + H₂O(g) = CO₂(g) + H₂(g)
ΔH°f (CO(g)) = -110.525KJ/mol
ΔH˚f (CO₂ (g)) = −393.509KJ/mol
ΔH°f (H₂O(g)) =-241.818KJ/mol
ΔH°f (H₂(g)) = 0
is basalt the best source for garnet
Basalt is a good source of granet but not the best. Granite can be a better source for it.
What is special about basalt?
Olivine, pyroxene, and plagioclase are the major minerals that makeup basalt, which is abundant in iron and magnesium. The majority of specimens have a glassy, compact, fine-grained texture. Additionally, they may contain plagioclase, augite, or olivine phenocrysts and be porphyritic. Basalt may have a coarsely porous texture due to gas bubble-induced holes.
The metamorphic rocks are where you'll find the garnets that make rocks. Particularly in granite and granitic pegmatite, which occur in igneous rocks. Clastic sediments and sedimentary rocks occasionally contain garnets that were formed from such rocks. The primary type of rock used to make cogged stones, basaltic scoria, is made from magmas that effusively erupt at the surface as lava flows and are mostly generated from various regions of the Earth's mantle or lower crust.
Hence, basalt is not the best source for granet.
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Basalt is not typically considered a primary source of garnet. Garnet is a mineral that occurs in a variety of rock types, including metamorphic rocks like schist and gneiss, as well as some igneous rocks like granite. While it is possible for garnet to occur in basaltic rocks, it is not the most common or abundant source.
The most significant sources of garnet are often associated with metamorphic processes, where the mineral can crystallize and grow within specific temperature and pressure conditions. Garnet can also be found in placer deposits, which are accumulations of minerals in sedimentary environments like riverbeds and beaches, where erosion has concentrated heavy minerals like garnet.
If you are specifically looking for sources of garnet, it's more common to find it in rocks like schist, gneiss, and certain types of sedimentary rocks, rather than basalt. However, the presence of garnet in any rock type depends on the geological history of the region.
if 17.9 mlml of 0.800 m hcl hcl solution are needed to neutralize 5.00 mlml of a household ammonia solution, what is the molar concentration of the ammonia?
Ammonia has a concentration of 2.864 M. Utilizing the formula provided by the neutralization reaction, n1M1V1=n2M2V2,
What is the purpose of ammonia?Ammonia generated from industries is utilized as agricultural fertilizer to the extent of 80%. In addition to such uses, ammonium is made into plastics, explosives, textile, insecticides, dyes, and other chemicals. It is also employed to cleanse water supplies.
What can you find ammonia in?It is an abundant source of nitrogen to plants and animals and can be found in the water, soil, and air. The natural decomposition of manure or dead animals and vegetation is the primary source of the majority of the ammonia with in environment. Fertilizer is used with 80% of all manufactured ammonia.
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identify the type of interactions involved in each of the following processes taking place during the dissolution of sodium chloride ( nacl ) in water.
The answers include the following below:
Solvent-Solvent interactionsInteractions involving dipole-dipole interaction, interactions between the water moleculesSolute-Solute interactionsInteractions between ions of sodium chloride, interactions involving ion-ion attractionsSolute-Solvent interactionsInteractions formed between the sodium ions and the oxygen atoms of water molecules, interactions formed between the chloride ions and the hydrogen atoms of water molecules.The dissolution of salt in water is as a result of the combination of the solute which is the salt and solvent which is the water. Interactions go on between water molecules which is referred to as the Solvent-Solvent interactions and so on.
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Carbon tetrachloride is a colorless liquid. How many molecules of carbon tetrachloride are in 6.32 mg of that compound?
a. 2.47 x 10^19
b. 5.85 x 10^23
c. 6.82 x 10^29
d. 1.64 x 10^24
Option A.
The number of molecules of carbon tetrachloride in 6.32 mg of the compound is 2.47 x 10¹⁹ molecules.
What is the molecular mass of Carbon tetrachloride?The molecular mass of Carbon tetrachloride is calculated as follows;
Molecular formula = CCl₄
CCl₄ = (12) + (35.5 x 4)
CCl₄ = 154 g/mol
The number of moles of carbon tetrachloride in 6.32 mg is calculated as follows;
n = reacting mass / molar mass
n = (6.32 x 10⁻³) / (154)
n = 4.1 x 10⁻⁵ moles
1 mole of CCl₄ = 6.02 x 10²³ molecules
4.1 x 10⁻⁵ moles of CCl₄ = ?
= 2.47 x 10¹⁹ molecules
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PLEASE CHECK MY ANSWER my answer is D
The answer to this question is actually B.
The question is asking to select the procedure that can show how matter is conserved in physical changes. Removing the core from an apple may be a physical change, but matter is not conserved since something is being lost, the core. Inversely, by melting a piece of ice, no matter is lost and the mass will stay the same before and after the change.
A is incorrect because some matter is also lost there, and C is not a physical change.
Answer: B
Explanation:
Examine Table 10.3 and list the compounds you think have hydrogen bonds. Explain why.
Answer
Ethanol and Ethylene Glycol
Procedure
Hydrogen bonding occurs when hydrogen forms a molecular bond with a highly electronegative element such as Oxygen, Nitrogen, and Fluorine. Based on the structure of the molecules we can see that ethane does not contain the previously mentioned elements, therefore it will not form hydrogen bonds. Dimethyl ether has an oxygen atom located in the middle of the molecule, making it difficult to form a bond with other dimethyl ether molecules.
Lastly, Ethanol and Ethylene Glycol possess OH groups which are free to interact with similar groups via hydrogen bonding. Additionally, these last compounds exhibit higher boiling points, which can indicate a stronger intermolecular bonding, which is a characteristic of hydrogen bonding.
in one of your reaction cuvettes you've added 1.0 ml of dtnb, 20 ul of 30 um acsch, 20 ul of 5 um tacrine, and 20 ul of ace. what are the final concentrations of acsch and tacrine in that reaction? be sure to show units and your calculations.
Final concentrations of acsch and tacrine in that reaction is 600x10⁻¹²mm.
What is the purpose of tacrine?The symptoms for mild to moderate Hypertension are managed by tacrine. Alzheimer's disease cannot be cured or prevented from worsening with tacrine. However, some Alzheimer's sufferers may benefit from tacrine since it helps them think more clearly.
How would you define the reaction?The behavior, procedure, or event of responding. B: opposition or resistance to a power, influence, or movement, particularly: a propensity for an old-fashioned and typically obsolete social or political order or policy.
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Eric wants to make sure he understands the parts of a good scientific investigation. He knows that scientific investigations include many different steps. During a scientific investigation, which step occurs after a scientist collects data?
A:Draw conclusions
B:Form the hypothesis
C: Plan the experiment
D: Follow the procedure
Answer:
B. Form the hypothesis
Explanation:
After collecting data and observations, a scientist makes a hypothesis and plans an experiment to test said hypothesis.
1. Which are examples of heterogeneous mixtures? Select all that apply.
muddy water
salt water
pure gold
chocolate chip cookies
Answer:
1. Muddy water
2. Salt water
3. Chocolate chip cookies
Explanation:
I did this
Calculate the number of joules given off when 32.0 grams of steam cools from 110.0 C to ice at -40.0 C
Pls show work
Answer: POINT GRIND
Explanation:
JUGUY
how much PE would a 100 kg man have on a sled at the top of the hill?
The Potential energy of a 100 - kilogram man on a sled at the top of the hill would be 980H, where H is the height of the sled on the top of the hill.
What is mechanical energy?Mechanical energy is the combination of all the energy in motion represented by total kinetic energy and the total potential energy stored energy in the system which is represented by total potential energy.
As given in the problem we have to find out how much PE would a 100 kg man have on a sled at the top of the hill.
The potential energy of the man = 100 × 9.8 × H
= 980H
Both mass and acceleration due to the gravity of the earth are constant and the only variable is the height of the inclined surface.
Thus, a ball rolling down an incline has its maximum potential energy at the top, therefore the correct answer is option D.
Thus, the Potential energy of a 100 - kilogram man on a sled at the top of the hill would be 980H, where H is the height of the sled on the top of the hill.
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Look at the DNA sequence below, and circle any places where a mutation would occur.
G-C
G-C
A-T
T-A
T-T
G-T
A-T
C-G
C-A
T-T, G-T, C-A are wrong and are places where a mutation would occur as they don't follow Chargaff's rule
What are mutations?
Mutations occur during DNA replication if errors are made and not corrected in time
A point mutation occurs in genome when a single base pair is added, deleted or changed.
What is Chargaff's rule?
Erwin Chargaff proposed the Chargaff's rule.The DNA of any organism should have purine and pyrimidine bases in 1:1 ratioThis rule played an essential role in discovering double-helical structure of DNA.Rule states that in any double-stranded DNA, the ratios between Adenine and Thymine and Guanine and Cytosine are constant and equal.Adenine forms double bond with thymine and Guanine forms triple bond with cytosine.From the above details we can conclude that T-T, G-T, C-A are wrong and are places where a mutation would occur.
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a certain mass of nitrogen gas occupies a volume of 9.33 l at a pressure of 8.06 atm. at what pressure will the volume of this sample be 11.71 l? assume constant temperature and ideal behavior.
The pressure at which the volume of this sample is 11.71 l is 6.42 atm.
The moles and temperature of the nitrogen gas remain constant and we anticipate that it has ideal conditions, so we can use Boyle's law to solve this problem. We are able to write the equation as follows:
P1V1=P2V2
Initial volume (given); V1=9.33L
Initial pressure (given); P1=8.06atm
The final volume (given); V2=11.71L
Final pressure (given); P2=?
Calculation:-
8.06atm × 9.33L = P2 × 11.71L
P2 = 8.06atm × 9.33L = 75.1998atm = 6.4218 atm ≅ 6.42 atm
11.71L 11.71
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Based on the chemical equation, use the drop-down menu to choose the coefficients that will balance the
chemical equation: 1
DH₂0-DH₂ + O₂
Intro
Lot 10
Done
Answer:
D = 2
2H₂0 → 2H₂ + O₂
Explanation:
I'll assume that "DH₂0-DH₂ + O₂" is meant to read:
DH₂0 → DH₂ + O₂
Water decomposes into oxygen (O2) and hydrogen (H2) molecules.
We are to find a vale of D that will balance this equation.
DH₂0 → DH₂ + O₂
Count the atoms on both sides of the equation, assuming D is 1 at this point:
(D = 1)
Element Reactant Product Balanced?
H 2 2 Yes
O 1 2 No
We need an additional oxygen atom on the reactant side, so lets try D=2:
2H₂0 → 2H₂ + O₂
Element Reactant Product Balanced?
H 4 4 Yes
O 2 2 Yes
The equation is balanced for D = 2:
2H₂0 → 2H₂ + O₂
g how accurately can the position of a 3.00- kev electron be measured assuming its energy is known to 3.00 % ?
The electron has a kinetic energy of 3 KeV. The accuracy rate for locating the electron is one percent.
What is in a electron?A negative charges particle known as an electron can either be free or attached to an atom (not bound). One of the three main types of particles within an atom is an electron that is bonded to it; other two are protons and neutrons.
How are electrons created?An electrical force maintains electrons in their shells. An atom's protons and electrons are drawn to each other. They both are electrically charged. Electrons have a negative charge (-), while protons have a positive charge (+).
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what physical change would most likely occur to occupnats of an unpressurized aircraft flying over 15000 feet without
According to the given statement Along with tunnel vision, blue fingernails and lips start to appear.
What is the physical change?A substance undergoes a physical shift when its shape or appearance changes but the sort of matter it contains does not. On the other hand, a chemical transformation of matter results in the creation of at least one new material with novel properties. Differentiating between chemical and physical change can be challenging.
What importance does physical change have?In chemistry, the term "physical change" refers to changes to items that don't produce entirely new substances. A substance's molecular structure is maintained by physical change. For example, whether it is boiling or freezing, water is made up of two hydrogen atoms and one oxygen molecule.
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Identify the products that complete the following
reaction.
H3PO4 + Ba(OH)₂ →
A. BaPO4 + H₂O
B. Ba3P₂ + H₂O
C.Ba3p2+ H20
D.Ba3(po4)2+H2O
how many grams of mgso 4 4 should be used if you desire to make 1.0 grams of mgcl 2 2 ? do not include units in your answer. make sure your answer has at least 3 significant digits
The mass (in grams) of MgSO₄ That should be used is 1.26 g
How to determine the mass of MgSO₄We'll begin by writing the balanced equation for the reaction. This is given below:
MgSO₄ + 2HCl —> MgCl₂ + H₂SO₄
Molar mass of MgSO₄ = 24 + 32 + (16 × 4) = 120 g/molMass of MgSO₄ from the balanced equation = 1 × 120 = 120 gMolar mass of MgCl₂ = 24 + (35.5 × 2) = 95 g/mol Mass of MgCl₂ from the balanced equation = 1 × 95 = 95 gFinally, we shall determine the mass of MgSO₄ needed for the reaction as follow:
From the balanced equation above,
95 g of MgCl₂ were produced from 120 g of MgSO₄
Therefore,
1 g of MgCl₂ will be produce from = (1 × 120) / 95 = 1.26 g of MgSO₄
Thus, the mass of MgSO₄ needed is 1.26 g
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25 ml of a 0. 10 m solution of magnesium chloride reacts with 25 ml of potassium hydroxide to form a magnesium hydroxide precipitate. What is the minimum concentration of potassium hydroxide necessary to completely precipitate all of the magnesium?.
Magnesium chloride, often known as MgCl2, can be produced chemically by extracting it from brine or seawater.
Magnesium chloride+ potassium hydroxide (25 ml )------>magnesium hydroxide
Magnesium chloride: what is it?
One magnesium (Mg) and two chloride ions make up magnesium chloride, also known as magnesium dichloride, magnesium (II) chloride, or chloromagnesite (Cl-).
Ionic halides, such as magnesium dichloride and related salts, have the appearance of fine, white to grey granules.
It has no smell and is very water soluble.It is frequently employed as medication for numerous cellular processes.Uses of MgCl2 (Magnesium Chloride)
Magnesium metals are produced using magnesium chloride as a precursor.utilised for soil stabilisation, dust management, and wind erosion.Fire extinguishers use this.used as an additive in food.utilised in the production of paper.is a component of disinfectants.a flocculating agent is used.To learn more about Magnesium hydroxide reaction, visit
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the major product of this reaction exists as two stereoisomers. draw both isomers. show all hydrogen atoms in the structures. use wedge and dash bonds to indicate the stereochemistry.
It is a method of representing the 3- D structure of a molecule in which simple lines represent bonds in the plane of the image, wedge-shaped lines represent bonds towards the viewer and dashed lines represent bonds away from the viewer.
What are stereoisomers?
Stereoisomers are isomeric molecules with same molecular formula but differ in the three-dimensional orientations of their atoms in spaceThus they posses similar physical and chemical properties.Stereoisomers are divided into geometric and optical isomersWhat is nucleophilic attack?
A nucleophilic attack occurs when an electron-rich species (the nucleophile) attack an electron-deficient species (the electrophile, a carbocation) forming a new bond between the nucleophile and the carbocation
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an element with a mass of 780 grams decays by 18% per minute. to the nearest minute, how long will it be until there are 30 grams of the element remaining?
A 780 gram element decays at a rate of 18% every minute. 780 elements are still missing (1-0.171) 19 .
Element:
What does that mean?A basic object that is difficult to divide into smaller bits is described as an element. An element is a chemical that cannot be broken down by non-nuclear processes in physics or chemistry. A discrete component of a bigger structure or collection is referred to as an element in computers and mathematics.
Element and atom definitions?The most basic form of a material is an element. In general, it cannot be streamlined or broken down into smaller parts. A constituent of an element is an atoms. A specific element only has one kind of atom per atom. Charged particles, neutrons, and electrons, which are particles, make up the remainder of an atom.
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what are the answers??
Answer:
c
Explanation:
Part 1: Composition of the Atm Name the three major gases in the atmosphere from greatest to least
Answer:
1) Nitrogen
2)Oxygen
3)Argon
Explanation:
Nitrogen has 78.1 % gasses
Oxygen has 20.9 % gasses
Argon has 0.93 % gasses
A source of energy is needed to start the burning of the candle. What energy source is used? Did the reaction give off or absorb heat?
The two liquids being measured when obtaining an absorbance spectrum are called the ______ and the _______ solutions.
Answer:
head
Explanation:
Edge 2022
_________ is defined as a method of preparing cocaine as a chemical substance so that it can be smoked. 1. coca paste 2. freebase 3. acetylation 4. protonation
The correct option is freebase. Cognitive therapy is most commonly employed in the treatment of anxiety disorders in conjunction with behavioral approaches, which may involve exposure exercises.
Cognitive therapy is often restricted to 20 sessions or less and is problem-focused on the concerns identified by the patient as being of primary concern. It causes a condition of extreme excitation. Powdered methamphetamine is injected, snorted, or smoked. Because they serve various functions, different cognitive-behavioral techniques are required. A cognitive-behavioral strategy to improving learning, for example, might have different criteria than a method for treating a depressed individual.
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