The annual operation of the refrigerator produces 6835.5 g of sulfuric acid. This calculation is made assuming that the enthalpy of combustion for sulfur is equal to the enthalpy of combustion for carbon.
First, we are going to transform 655 kWh into kilojoules. Because 1 kWh = 3.6e6 J = 3600 kJ, that means that a typical frostless refrigerator uses 655 * 3600 kJ = 2358000 kJ of energy on a yearly basis.
The enthalpy of combustion for carbon (or enthalpy of carbon dioxide formation) is -393 kJ/mol. That means that we can calculate the number of moles of carbon needed to produce 2358000 kJ of energy.
2358000 kJ / 393 kJ/mol = 6000 mol of carbon
Because the molar mass of carbon is 12 g/mol we need
6000 mol * 12 g/mol = 72000 g of carbon
If 3.1% of this carbon is actually sulfur, then we will burn 0.031 * 72000 g = 2232 g of sulfur during one year. The molar mass of sulfur is 32 g/mol, which means we transformed 2232 g / 32 g/mol = 69.75 mol of sulfur into sulfur dioxide and further into sulfuric acid. Because 1 mol of sulfur is needed to produce 1 mol of sulfuric acid, we produced 69.75 moles of sulfuric acid.
The molar mass of sulfuric acid is 98 g/mol, so over the course of one year, we produced 69.75 mol * 98 g/mol = 6835.5 g of sulfuric acid.
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You're comparing three different atoms. Atom A has 9 protons in the nucleus, Atom B has 10 protons, and Atom C has 11 protons.
a. Which atom would be least likely to react with other atoms? Why?
b. Which would form a positively charged ion? Why?
Answer:
a. Atom B will be least likely to react with other atoms as it is contains 10 electrons in neutral state with E.C. : 2,8. Since it has an octet, it is stable and does not react with other atoms.
b. Atom C forms a positive ion. It contains 11 electrons in neutral state with E.C. : 2,8,1. To attain an octet, it will donate an electron to form a positive ion.
Stoichiometry is possible due to _________.
A. Newton's three laws of motion
B. Law of Conservation of Mass
C. Law of Molarity
D. Law of Scientific Principles
Answer:
[tex] \sf{\blue{\fbox{B.{\green{ \: Law \: of \: Conservation \: of \: Mass}}}}}[/tex]
A 2,800 g piece of metal absorbs 14,014 j of energy as it is heated from 22. 0 °c to 35. 0 °c. What is the specific heat of this metal?.
The specific heat of this metal is 0.385 J/g ∘ C.
What is Specific heat?
The amount of heat needed to raise a substance's temperature by one degree Celsius in one gramme, also known as specific heat. Typically, calories as well as joules per gramme per degree Celsius are employed as the units of specific heat. For instance, water has a specific heat of 1 calorie (as well as 4.186 joules) per gramme per degree Celsius. The Scottish scientist Joseph Black, inside the 18th century, started to notice that equal masses of various substances needed various amounts of heat to raise people through the same temperature range, and, from in this observation, he founded this same concept of specific heat. Early in the 19th century, French physicists Pierre-Louis Uniformly as well as Alexis-Thérèse Petit proved that calculating a substance's atomic weight is possible by measuring its specific heat.
Given: m=2800g;△t=35 - 22 = 13C ;
Q=14,014 J
Now, Q=mc△t
14,014=2800×C×13
Specific heat capacity of the metal,
c = 14,014/2800x 13
=0.385 J/g ∘C
Hence, the specific heat of this metal is 0.385 J/g ∘ C.
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Based on the information in this passage, which of the following is a reasonable conclusion
Based on the information in this passage, the option that is a reasonable conclusion is option A- Scientists will never change the classification system again.
Why is the system of classification used?The term classification might refer to the process of classifying a final set of classes the process of allocating elements to pre-defined classes In the broad sense described above, classifying is a fundamental idea and a component of practically all types of activities.
As more and more new creatures are found, the new approach must be applied to classify them. To categorize species based on their shared traits, a new classification system is continually established.
From the passage, there have been a lot of changes made to the classification and the scientist have seen that the naming as well as classifying organisms is a tricky act and what they have done seems justified.
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See passage below
What’s in a Name?
(Lexile 670L)
Shakespeare wrote in Romeo and Juliet, “What’s in a name?
That which we call a rose by any other name would smell
as sweet.” He is saying that it doesn’t matter what we call
something. While it may not matter to fiction writers, names
are very important to scientists. Scientists need a way to
sort and classify groups of life forms. How scientists do
that has changed over time. As we learn more and more
about the world around us, classifications are updated.
2 As science learns more about the characteristics of organisms, we have gotten better at
classifying them. The most basic level of classification is prokaryote and eukaryote.
Prokaryotes are organisms that don’t have a nucleus. They also don’t have any other cell
structures surrounded by membranes. They are species of bacteria and archae. Eukaryote
cells have a nucleus and complex parts enclosed within membranes. The organisms that we
know by sight are all eukaryotes. They are animals, flowers, mushrooms, and protists.
3 A domain is the largest rank of organism. There are three domains: Eukarya, Bacteria, and
Archaea. Eukarya is the domain for all eukaryotes. These organisms have a cell nucleus and
a membrane that encloses a complex structure. Most of what we think of as “animals” are in
this domain. It includes all plants, fungi, and protists. Bacteria is the domain made of bacteria.
These prokaryotes include the oldest fossils on Earth.
Every living being on the planet falls into one of these three domains. All eukaryotes are a part
of the Eukarya domain. All bacteria are a part of the Bacteria domain. All of archaea fall into
the Archaea domain.
5 The next smallest rank of organism is kingdom. The eukaryotic kingdoms are: Animalia, Fungi,
Plantae, and Protista. The prokaryotic kingdoms are Eubacteria and Archaea. Organisms are
sorted into kingdoms based on how complex their cells are and how they obtain nutrients and
reproduce. Naming and classifying organisms is a tricky process. Scientists must make changes to keep
up with new discoveries and information. Knowing the basics can help you think like a scientist when you read about life science.
Based on the information in this passage, which of the following is a reasonable conclusion?
A- Scientists will never change the classification system again.
B- Scientists know everything there is to know about all organisms.
C-Scientists have never changed the classification system.
D-New scientific discoveries could change the current classification system.
Given the equation ΔE = hc/ where h and c are constants, is the wavelength, directly or inversely proportional to the change in energy, ΔE?
λ is the wavelength, directly or inversely proportional to the change in energy, ΔE.
ΔE = hc/ λ
Here, h = planks constant
c = speed of light
λ = wavelength
Since h and c are constant.
ΔE = 1/λ
Hence, λ is the wavelength, directly or inversely proportional to the change in energy, ΔE.
Energy is the quantitative asset this is transferred to a frame or to a physical gadget, recognizable in the overall performance of work and inside the form of heat and light. strength is a conserved quantity—the regulation of conservation of power states that electricity.
Energy exists in lots of different forms. Examples of these are mild power, heat strength, mechanical energy, gravitational energy, electrical power, sound strength, chemical energy, nuclear or atomic energy, and so forth. each form can be converted or modified into the other forms.
Energy is absorbed to interrupt bonds and released when bonds are made. electricity adjustments in a reaction are calculated through bond energies and shown by power diagrams.
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What is the wavelength of a
microwave with a frequency
of 2,450 MHz?
Answer:
about 12 cm
Explanation:
Considering the frequency of 2,450 MHz, the wavelength of microwave oven radiation is about 12 cm and the quantum energy of a microwave photon is about 1 x 10-5 eV.
In the manufacture of the fertiliser ammonium sulfate, the normal percentage yield is
86.5%. Assuming this percentage yield, calculate the mass of fertiliser that could be produced from 1870kg of ammonia. Calculate your answer in kilograms to 3 s.f. The equation for the reaction is given below.
H2SO4 +2NH3→(NH4)2SO4
1870 kg = 1870000 g of ammonia
We first have to find out how many moles of ammonia that is. To do this, we divide the grams of ammonia by the molar mass of ammonia (17.031 grams/mole).
1870000/17.031 = 109799.7769 moles of ammonia
From the balanced equation, we know that 2 moles of ammonia will produce 1 mole of fertilizer. So to find out how many moles of fertilizer 109799.7769 moles of ammonia would produce, we multiply that number by the ratio of (1/2). (We always put what we want to find or figure out in the numerator)
109799.7769 x (1/2) = 54899.88844 moles of fertilizer
To convert this into grams, we must multiply 54899.88844 moles by the molar mass of (NH4)2SO4 which happens to be 132.14 grams/mole.
54899.88844 x 132.14 = 7254471.258 grams of fertilizer
This is just the theoretical yield to calculate the actual yield, we multiply this number by the percentage given in the question.
7254471.258 x 0.865 = 6275117.639 grams of actual fertilizer
If we round to 3 sig figs and convert it into kg, we get:
6280 kg of (NH4)2SO4
two paragraph summary of why isn't the sun on fire?
please I need this one quick..
The Sun does not "burn" as we think of logs in a fire or paper burning. The Sun glows because it is a very big ball of gas, and a process called nuclear fusion is taking place in its core.
Nuclear fusion occurs when one proton smashes into another proton so hard that they stick together and release some energy as well. This energy then heats the other materials (other protons and electrons and such) nearby.
This heating eventually grows out from the center (or core) of the star to the outside, finally leaving the surface and radiating out into space to be the heat and light we know stars emit.
People, including scientists, sometimes say that the Sun "burns hydrogen" to make it glow. But that is just a figure of speech. Hydrogen doesn't burn, it fuses, into helium. So no oxygen is required!
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If an msds identifies that a chemical is flammable what should you do?
A.keep the container sealed at the times
B.keep the chemical away from fire
C.dilute the chemical so it is less flammable
D.use another chemical that is not flammable
The answer choices where it says “choose” all of them are float and sink
Help!
Answer:
Ebony: sink, float
Gold: sink, sink
Corn oil: float, float
Explanation:
Higher density is heavier than lighter density
1. a solution is found to have a transmittance of 0.091. for this solution, calculate the absorbance of the solution, and the [fescn21 in the solution. calculate the absorbance and the [fescn2] for this solution
Absorbance (A) and [tex][FeSCN2^{+}][/tex] of the solution is 1.041
Transmittance=0.091
Absorbance (A) and [tex][FeSCN2^{+}][/tex] of the solution is calculated by:
A=-log( T), where T = 0.091
A=-log(0.091)
A=1.041
Absorbance (A) and [tex][FeSCN2^{+}][/tex] of the solution is 1.041
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Which situation shows that work is done? i. caryl is reading book. ii. caryl is writing her assignment. iii. caryl is moving the chair across the room. iv. caryl is pushing the cart from the main lobby to the garage
IV. Carol is pushing the cart from the main lobby to the garage
Work is defined as the force exerted on an object that cause the displacement of the object
The amount of work done can be derived from the product of the force and direction of displacement.
I.e W = F ×
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a standard pcr cycle includes three steps: denaturation (95°c), annealing (55°c), and elongation (65°c). drag each ingredients of a pcr reaction into the bin labeled with the step in the pcr cycle in which it is first used.
prove the statement about the PCR cycle
What is PCR cycle?
PCR is a laboratory techniques for rapidly producing millions of copies of a species.
So pcr goes through 3
different steps in integration, finaline and elongation. So first is denaturation and this happens at 95 degrees celsius, and this is where the template dana is requiredand. Then the stiffest step is the nailing, and this happens at 55 degrees celsius, and this is where primers are needed. That will attach to specific sequences of d and a that are needed to start elongation. So each step is kind of preparing for the next step. In the process, and then the third step is elongation and this happens at 65 degrees celsius and it requires the use of attack.
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The rectangular object below has a mass of 198,000 grams.
A) What is the volume of the rectangular prism?
B) What is the density of the object? (Round your answer to the nearest hundredths place)
C) What rectangular prism made out of ?
A. 0.225
B. 4.6 kg/m3.
C. These six faces are made of three pairs of congruent faces.
For an object to be a right-angled prism all six faces must be rectangular opposite faces must be equal, and cross-sections along the length must be equal. You can draw a rectangle on the paper, but you can also make a rectangular prism out of real materials such as wood. A right-angle prism is a three-dimensional object with rectangular faces. A right-angled prism is a cube if all the faces of the prism are squares.
Prisms are named for the shape of their faces. A right-angle prism is therefore a simple prism that has rectangles as faces. A closed three-dimensional shape, but based on two rectangles. A prism is a three-dimensional shape bounded by flat faces on all sides. Prisms have two types of faces. The top and bottom are the same and are called the base. Prisms are named after the shape of these bases. For example, if the base of a prism is triangular it is called a triangular prism.
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Conclusions
What conclusions can you draw about the identity of the unknowns? Write an evidence-based claim.
Type your answer here
The claim regarding the above is that a known unknown is knowledge about which someone is aware but has no possession. Many scientific investigations, search engine and database searches, business intelligence (BI), and data analytics, among other channels of inquiry, are driven by known unknowns.
What is the evidence confirming the above?Known unknowns might potentially indicate possible concerns. Time and cost predictions in project management, for example, are intrinsically imprecise due to circumstances beyond the organization's control, such as supply chain concerns.
These are known in the sense that it is accepted that certain occurrences may occur, but it is uncertain, and frequently unknowable, whether or not they will.
A known unknown in security is knowing that there are present risks to network security but no information on whether they are affecting your network specifically.
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when is the velocity the greatest ? why?
Element Atomic #
Carbon
Lewis Dot Diagram Worksheet
Use the Bohr models to determine the number of valance electrons. Once you have found the number of valance
electrons, place them around the elements symbol.
Hydrogen
Lithium
Magnesium
Boron
Atomic
Mass
Name
Protons
Date
Block
Neutrons Electrons
Lewis Dot
Lewis structure, sometimes referred to as Lewis dot structure or electron dot structure, is an easy way to depict the electrons in the outermost shell of a chemical species, such as an atom, ion, or molecule.
What in chemistry is a Lewis dot diagram?Lewis structures, often referred to as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures (LEDS), are diagrams that depict the interactions of atoms inside molecules as well as any lone pairs of electrons that may be present.
What can we learn from a Lewis dot diagram?A Lewis structure is a visual representation of the electron distribution around atoms. To forecast the quantity and type of bonds that might form around an atom, Lewis structures must be drawn. The geometry of a molecule can also be predicted using a Lewis structure.
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Explain why warm nitric (V) acid is used in preparation of lead carbonate
If the density of an object is greater than 1 g/ml, what does that mean?
Group of answer choices
The object is heavier than gold
The object will float in water
The object will either sink or float in water depending on its size
The object will sink in water
If the density of an object is greater than 1 g/ml, it means that the object will sink in water (option D).
What is density?Density is the measure of the mass of matter contained by a unit volume. It can be calculated by dividing the mass of a substance by its volume.
An object, usually solid, will float or sink in another substance (liquid) depending on its density. Water has a density of 1g/mL, which means that any object greater than 1g/mL will sink in water.
According to this question, the density of an object is greater than 1 g/ml, suggesting that it wIll sink in water.
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Our school garden needs some ammonium fertilizer
prepare a fertilizer of ammonium salt,try to use NPK
To prepare ammonium fertilizer we will react ammonia gas with nitric acid to form a solution and heat also get released during this.
What is ammonium fertilizer and how it is prepared?We have always studied about fertilizer , and its uses back in our earlier classes.Fertilizers are used to sprinkle onto the plants for its either resistant or better growth expectation.Ammonium fertilizer have a significant role in the fertilizer industry pf agriculture as it is prepared by the three main component of the chemical life that is NPK.NPK goes for nitrogen, phosphorus, and K stands for potassium.All three can be used in combine for to produce considerable amount of ammonium fertilizer.To know more about fertilizer visit:
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the structure of an enzyme inhibitor is given. identify the chirality center(s) in the structure. a molecule with several functional groups are labeled with letters a through g. atom a is a carbon bonded to two identical carbons, a third carbon and hydrogen. atom b is a nitrogen bonded to a carbonyl, hydrogen and carbon. atom c is a carbon bonded to nitrogen, a dashed bond to c h 2 o p o 3, and a c h 2 bonded to a nitrogen. atom d is a nitrogen bonded to a wedged bond to hydrogen, a dashed bond to a carbon, and two in plane bonds to two other unique carbons. atom e is a carbon with a wedged bond to a carbon, a bond to nitrogen, and an in plane bond to a carbonyl. atom f is a nitrogen bonded to a carbonyl carbon, hydrogen and a methylene carbon. atom g is a carbon double bonded to a carbon, single bonded to two other unique carbons. identify the chirality center(s). a b c d e f g
The chirality of center is c, d and e are chiral center
Chirality means that an object or molecule cannot be superimposed on its mirror image by any translations or rotations
According to given data the c is the attached to the carbon bonded to nitrogen and a dashed bond to CH₂ OPO₃ and a CH₂ bonded to a nitrogen so it is chiral center and then d is a nitrogen bonded to a wedged bond to hydrogen a dashed bond to a carbon and two in plane bonds to two other unique carbons that's why d is also the chiral center and then e atom is a carbon with a wedged bond to a carbon a bond to nitrogen and an in plane bond to a carbonyl so e is also the chiral center of the given compound
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I NEED AN ANSWER ASAP! THIS IS DUE TOMARROW! at room temperature and standard pressure nitrogen is a gas and water is a liquid explain how the interactions between molecules cause a difference in the state of nitrogen and water
Nitrogen exists as a diatomic molecule, N2 (subscript 2). It exists as a gas at room temperature because of the type of interactions with other identical molecules: weak intermolecular forces are present between the molecules, specifically temporary dipole-dipole interactions.
These interactions are the second weakest type of intermolecular force (Van Der Waals and Hydrogen Bonds are the other two with Hydrogen Bonds being stronger).
Now the reason why Nitrogen exists as a gas is because these weak intermolecular forces can be overcome with little energy. Therefore, at room temperature, Nitrogen exists as a gas.
Now if we wanted to get liquid Nitrogen (quite common in Science demonstrations) we would have to cool Nitrogen down to -195.8°C (77.35°K). The energy of the particles would decrease so much that the dipole-dipole interactions would be strong enough to hold the molecules of Nitrogen together in a liquid state.
Intermolecular forces such as dipole-dipole forces, London dispersion forces exist between molecules and these depend on strength of electronegativity of molecule. Intermolecular forces of attraction decides the states of a matter.
What is intermolecular forces of attraction?Intermolecular forces of attraction is force of attraction that make two molecule come closer. Intermolecular forces of attraction is directly proportional to the electronegativity of the molecule.
Intermolecular forces of attraction play an important role in deciding the states of a matter. Nitrogen is a gas because its molecule have vanderwaal force of attraction. Water is a liquid because its molecule have hydrogen bonding.
Therefore, intermolecular forces of attraction decides the states of a matter.
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How much heat is required to heat 100 g of water is from 80.0°C to 85.4°C? The specific heat of water is 4.184 J/g°C.
The amount of heat energy required to heat 100 g of water from 80.0°C to 85.4°C is 2259.36J.
How to calculate energy?The amount of energy required to heat a substance can be calculated using the following formula:
Q = mc∆T
Where;
Q = quantity of heatm = mass of substanceC = specific heat capacity∆T = change in temperatureAccording to this question, 100 g of water is from 80.0°C to 85.4°C. The amount of heat energy can be calculated as follows:
Q = 100 × 4.184 × {85.4 - 80}
Q = 2259.36J
Therefore, 2259.36J is the amount of heat energy required to heat that amount of water.
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calculate the concentrations of H2????????3, H????????3−, ????????32− ???????????? ????H− at equilibrium in a solution that was initially 0.10 m in ????????2????????3. H2????????3: K????1
Since total volume is 1.00 L, the number of intelligencers is equal to molar attention.
The equilibrium constant K c = ( H 2)( I 2)( HI) 254.4 = x × x(0.0400 −2 x) 254.4 =( x(0.0400 −2 x)) 254.4 =( x(0.0400 −2 x))
Equilibrium
When a system is in equilibrium, neither its internal energy state nor its state of agitation tend to vary over time. If a simple mechanical body suffers neither direct acceleration nor angular acceleration, it is considered to be in equilibrium; unless disturbed by an external force, this state will last forever. Equilibrium exists for a single flyspeck if the vector sum of all forces acting on it is zero.
A rigid body is said to be in equilibrium if, in addition to the nations listed for the flyspeck over, the vector sum of all ropes acting on the body equals zero so that its state of rotational stir does not change. This is how a rigid body is distinguished from a flyspeck by having the property of extension.
When modest, externally motivated deportations from an equilibrium result in forces that have a tendency to oppose the deportation and bring the body or flyspeck back to the equilibrium state, the equilibrium is said to be stable.
Examples are a weight that is suspended from a spring or a slipup that is placed face down on a position face. If the least deviation results in forces that tend to promote relegation, the equilibrium is unstable. A balanced ball bearing serves as an example.
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Correct question -
calculate the concentrations of H2, H3−, 32− H− at equilibrium in a solution that was initially 0.10 m in 2 3. H2 3: K1?
Students were asked to select methods to increase the rate of dissolving a solid. Which methods would increase the rate? Select all that may apply.
Select 3 correct answer(s)
1. Increasing the pressure so that a solid dissolves in the solution.
2. Shaking/stirring the mixture causing an increase in the rate of dissolution.
3. Grinding the solute to increase the surface area.
4. Decreasing the pressure so that a solid dissolves in the solution.
5. Increasing the temperature in order to increase molecule collisions.
5. Increasing the temperature to increase molecule collisions.
What factor increases the solubility of a solid in a solution?An increase in the temperature of the solution can increase the solubility of a solid solute. For example, a greater amount of sugar will dissolve in warm water as compared to in cold water. The size of solute particles, stirring of the solution and increasing temperature of the solution are the three factors that can affect the solubility of a solid in a solvent. Increasing the surface area of the solute will also increase the rate of dissolving in a solution as well as increase the temperature of the solvent. Stirring will increase the speed which also increases the rate of dissolving a solid solute in a solution which helps in attaining higher solubility.
So we can conclude that temperature is the factor that increases the solubility of a solid into a solution.
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Answer:
Increase temp
Shaking/ stirring
Grinding
Explanation:
Chatgpt hehehehe
The manipulated variable determines the responding variable.
True
False
30 POINTS!
A 240.0 gram piece of copper is dropped into 400.0 grams of water at 24.0 °C. If the final temperature of water is 42.0 °C, what was the initial temperature of the copper piece? (5 points)
Specific heat of copper = 0.39 J/g °C
Group of answer choices
322 °C
345 °C
356 °C
364 °C
Taking into account the definition of calorimetry, the correct answer is las option: the initial temperature of the copper piece is 364°C.
CalorimetryCalorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
So, the equation that allows to calculate heat exchanges is:
Q = c×m×ΔT
where:
Q is the heat exchanged by a body of mass m.c is the specific heat substance. ΔT is the temperature variation.Initial temperatureIn this case, you know:
For copper:Mass of copper= 240 gInitial temperature of copper= UnknownFinal temperature of copper= 42 ºCSpecific heat of copper = 0.39 J/gC For water:Mass of water = 400 gInitial temperature of water= 24 ºCFinal temperature of water= 42 ºCSpecific heat of water = 4.18 J/gCReplacing in the expression to calculate heat exchanges:
For copper: Qcopper= 0.39 J/gC × 240 g× (42 C - Initial temperature of copper)For water: Qwater= 4.18 J/gC× 400 g× (42 C - 24 C)If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.
Then, the heat that the copper gives up will be equal to the heat that the water receives. Therefore:
- Qcopper = + Qwater
- 0.39 J/gC × 240 g× (42 C - Initial temperature of copper)= 4.18 J/gC× 400 g× (42 C - 24 C)
Solving:
- 93.6 J/C× (42 C - Initial temperature of copper)= 30,096 J
- 93.6 J/C× 42 C- (- 93.6 J/C)× Initial temperature of copper= 30,096 J
- 3,931.2 J +93.6 J/C × Initial temperature of copper= 30,096 J
93.6 J/C × Initial temperature of copper= 30,096 J+ 3,931.2 J
93.6 J/C × Initial temperature of copper= 34,027.2 J
Initial temperature of copper=34,027.2 J÷ 93.6 J/C
Initial temperature of copper= 364 °C
Finally, the initial temperature of the copper is 364 °C.
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Answer:
the correct answer is 364
q = m * c * ΔT
where q is the heat absorbed or released, m is the mass of the substance, c is the specific heat capacity of the substance, and ΔT is the change in temperature.
We can assume that the heat lost by the copper is gained by the water, so:
q(copper) = -q(water)
where the negative sign indicates that the copper loses heat while the water gains heat.
The specific heat capacity of copper is 0.39 J/g °C, so:
q(copper) = 240.0 g * 0.39 J/g °C * (T(copper) - 24.0 °C)
The specific heat capacity of water is 4.18 J/g °C, so:
q(water) = 400.0 g * 4.18 J/g °C * (42.0 °C - T(copper))
Setting q(copper) equal to -q(water), we get:
240.0 g * 0.39 J/g °C * (T(copper) - 24.0 °C) = -400.0 g * 4.18 J/g °C * (T(copper) - 42.0 °C)
Simplifying and solving for T(copper), we get:
T(copper) = [(400.0 g * 4.18 J/g °C * 42.0 °C) + (240.0 g * 0.39 J/g °C * 24.0 °C)] / (240.0 g * 0.39 J/g °C + 400.0 g * 4.18 J/g °C)
T(copper) = 364.1 °C
Therefore, the initial temperature of the copper piece was 364.1 °C.
Hence, the answer is "364 °C".
Please help me I am so confused. :)
The diagram model of emission lines four element could be the part of unknown star composition is C and D
Emission lines refer to the fact that glowing hot gas emits lines of light, whereas absorption lines refer to the tendency of cool atmospheric gas to absorb the same lines of light and when light passes through gas in the atmosphere some of the light at particular wavelengths is scattered resulting in darker bands
Here in the given data is unknown star and in that unknown element we have to chose which four element are match or seen as like unknown given sample so in the option the option c and d are as like as unknown sample because in the unknown sample the emission lines are same as in option c and d
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When a molecule of oxygen moves from outside of a eukaryotic cell to eventually be reduced by complex iv of the electron transport chain, how many phospholipid bilayers does it need to cross?.
When entering from the outside of a eukaryotic cell, an oxygen molecule must cross three phospholipid bilayers before being reduced by complex iv of the electron transport chain.
The mechanism through which ATP generation is linked to the flow of electrons through the mitochondrial electron transport chain and the subsequent consumption of oxygen is known as oxidative phosphorylation. It is the last phase of cellular respiration which occurs in the mitochondria. The electron transport system is found in the inner mitochondrial membrane and through a sequence of redox processes, electrons are moved from one member of the transport chain to another.
Therefore, we can conclude that during the electron transport chain, a molecule of oxygen must pass through three phospholipid bilayers, which are symbolized by the cell membrane and the external and internal membranes of the mitochondria.
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Considering the combustion reaction of propane again, what mass of propane (C3H8) is necessary to react with 4.53 g of oxygen?
C3H8 + 5O2 → 3CO2 + 4H2O
0.0256 g C3H8
1.13 g C3H8
1.25 g C3H8
2.50 g C3H8
Taking into account the reaction stoichiometry, the correct answer is the third option: 1.25 grams of propane is necessary to react with 4.53 grams of oxygen.
Reaction stoichiometryIn first place, the balanced reaction is:
C₃H₈ + 5 O₂ → 3 CO₂ + 4 H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
C₃H₈: 1 moleO₂: 5 molesCO₂: 3 molesH₂O: 4 molesThe molar mass of the compounds is:
C₃H₈: 44 g/moleO₂: 32 g/moleCO₂: 44 g/moleH₂O: 18 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
C₃H₈: 1 mole ×44 g/mole= 44 gramsO₂: 5 moles ×32 g/mole= 160 gramsCO₂: 3 moles ×44 g/mole= 132 gramsH₂O: 4 moles ×18 g/mole= 72 gramsMass of C₃H₈ requiredThe following rule of three can be applied: If by reaction stoichiometry 160 grams of O₂ react with 44 grams of C₃H₈, 4.53 grams of O₂ react with how much mass of C₃H₈?
mass of C₃H₈= (4.53 grams of O₂× 44 grams of C₃H₈)÷ 160 grams of O₂
mass of C₃H₈= 1.25 grams
Finally, 1.25 grams of C₃H₈ is required to react with 4.53 grams of O₂.
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Answer:C. 1.25 g C3H8
Explanation:…