Final answer:
The photoelectric effect is indeed fundamental to how solar energy panels operate by using the energy of sunlight to eject electrons in a photovoltaic cell, creating electrical current that can be used as power. True
Explanation:
The photoelectric effect is indeed the basis for how solar energy panels, also known as photovoltaic cells, work today. When photons from sunlight strike the surface of a solar cell, they may have sufficient energy to eject electrons from the material of the cell, typically a semiconductor like silicon. This creates free electrons and corresponding holes. If there is an electrical circuit connected, these free electrons will flow through the circuit, thereby generating an electric current. This electric current can then be harnessed and used to power electrical devices or feed into the electrical grid.
It's important to note that the exact mechanism in solar cells is a bit different from the classic photoelectric effect observed in metals because semiconductors have a band gap that must be overcome by the incoming photons. This process is often referred to as the photovoltaic effect, which is closely related to the photoelectric effect as described by Albert Einstein.
Hypnotized by the twirling necklace held in her mother's hand, Becks was transported to another era. She imagined that she could see herself in the 1920s, the period in which the necklace was made. As the necklace danced in front of her, Becks could see what that time would have been like. The women were dressed in fringed dresses and their hair was swept up on one side. The men were wearing pinstriped suits with their hair slicked back. They were all dancing and laughing in a cramped dance room. This is all Becks saw as she gazed intently at the spinning necklace. From which point of view is this passage written? A. first person B. The point of view shifts from third person to second person. C. third person D. second person
Which is an example of a chemical change?
a.the separation of a mixture into its components
b.the separation of a compound into its elements
c.the separation of gases from liquids
d.the separation of air into oxygen, nitrogen, and other components?
A chemical change involves the conversion of substances into different substances, as in the separation of a compound into its elements which requires breaking chemical bonds, unlike a physical change.
Explanation:An example of a chemical change is the separation of a compound into its elements. This process involves breaking chemical bonds and forming new substances with different properties than those of the original compound. For instance, table salt (a compound of sodium and chlorine) cannot be separated into sodium and chlorine by physical means like filtering or distillation; it requires a chemical process. In contrast, physical changes, such as the separation of a mixture or the condensation of steam, do not produce new substances and are reversible.
Burning of gasoline and the souring of milk are also examples of chemical changes, where original substances are transformed into new ones, such as carbon dioxide and water from gasoline, and denatured proteins and produced acid from milk.
A classic chemical change can be observed when natural gas is burned in a furnace, converting methane and oxygen into water and carbon dioxide, signifying not just a visual change but a molecular transformation as well.
Ionic bonds are strong; therefore, ionic compounds
What is the percent yield of hbr if 85.00 g of hbr was formed from 30. g of h2?
Ok, lets see the definitions of percent yield, actual yield and theoretical yield.
Percent yield is the ratio of actual yield to theoretical yield.
Actual yield- amount of product produced in the EXPERIMENT.
Theoretical yield- max amount of product produced through CALCULATIONS
% yield= actual yield (from experiment)/theoretical yield (from calculation) *100
1st Step: Write the reaction
H2 + Br2 --> 2 HBr
2nd Step: Get the mass ratio of H2 and HBr to find theoretical yield
1 mole H2 gives 2 moles HBr ( molar mass of H2= 2 g/mol, HBr= 81 g/mol)
2 g H2 gives 2*81= 162 g HBr
30 g H2 gives 162*30/2 = 2430 g HBr ( The equation is 2 g H2/ 30 gH2= 162 g HBr/ x g HBr)
So theoretically 2430 g HBr are produced by calculation ( THEORETICAL YIELD)
By experiment 85 g HBr are produced as it is given at the question ( ACTUAL YIELD)
% yield= actual yield / theoretical yield *100 = 85/2430 *100= 3.5 %
The percent yield is 3.5 %.
How many moles of carbon are in 3.5 moles of calcium carbonate? ______?
Answer : The number of moles of calcium carbonate are 3.5 moles.
Explanation : Given,
Moles of carbon = 3.5 mole
The chemical formula of calcium carbonate is, [tex]CaCO_3[/tex]
By the mole concept:
In [tex]CaCO_3[/tex], there are 1 mole of calcium (Ca) atom, 1 mole of carbon (C) atom and 3 moles of oxygen (O) atoms.
As, 1 mole of carbon present in 1 moles of [tex]CaCO_3[/tex]
So, 3.5 mole of carbon present in 3.5 moles of [tex]CaCO_3[/tex]
Hence, the number of moles of calcium carbonate are 3.5 moles.
The number of moles of Carbon contained in 3.5 moles of Calcium Carbonate is; 3.5 moles of Carbon.
According to the question;
We are required to determine How many moles of carbon are in 3.5 moles of calcium carbonate.
The chemical formula of Calcium Carbonate is; CaCO3.
In essence, Calcium Carbonate contains;
1 atom of Calcium1 atom of Carbon3 atoms of Oxygen.Consequently, since 1 mole of Calcium Carbonate contains 1 mole of Carbon.
By proportion, 3.5 moles of Calcium Carbonate must contain 3.5 moles of Carbon.
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This is a(n) ____ reaction. c12h22o11 + h2o → c6h12o6 + c6h12o6
In what order do the levels get filled with electrons?
The first level must be filled with two electrons before electrons can be added to the second level.
(Plato users)
Appropriate units for the speed of a chemical reaction, the reaction rate, are _______.
What was the significance of the smog in Donora & London ?
a. People stopped burning coal to heat their homes
b. The public became aware of air pollution
c. Clean air acts were implemented.
d. Both B and C are correct
Magda has the two magnets shown below what will happen if magda tries to push the north poles of the two magnets toward one another
If a mineral has a daughter to parent ration of 3:1 (three daughter atoms for every one parent atom), how many half-lives have passed since the mineral formed?
Which is the correct number of valence electrons in the element sulfur (s)?
Answer:The answer is 6
Explanation:
The presence of the carbon-carbon double bond in eugenol can be tested using the bromine water test. write a balance equation for the reaction involved in this test?
What is a reduction potential chart show? What information does it have?
Answer:
It shows the reduction-oxidation tendency of chemical species present in the chart.
Explanation:
The reduction potential chart also known as activity series or electrochemical series is a reference series or chart constructed on the basis of reduction potential of standard hydrogen electrode (SHE). The standard reduction potential of SHE is considered to be zero.
Any species which can reduce SHE has negative reduction potential in the chart.
Any species which can oxidize SHE has positive reduction potential in the chart.
Higher the reduction potential more the tendency to undergo reduction and to oxidize others.
Lower the reduction potential more the tendency to undergo oxidation and to reduce others.
Which is the best description of the chemical reaction shown here in aqueous solution? ch3ch2cooh (aq) ↔ ch3ch2coo- (aq) + h+ (aq)?
Final answer:
The chemical reaction is an equilibrium reaction representing the partial dissociation of a weak acid, acetic acid, into acetate ions and hydrogen ions in aqueous solution.
Explanation:
The chemical reaction CH3CH2COOH (aq) ↔ CH3CH2COO- (aq) + H+ (aq) in aqueous solution is best described as the dissociation of a weak acid in water. This reaction is written as an equilibrium because it does not go to completion, and both the forward (dissociation) and reverse (re-association) reactions are occurring simultaneously. This reaction shows acetic acid partially ionizing in water to form acetate ions (CH3CH2COO-) and hydrogen ions (H+). The double arrows indicate that the reaction can proceed in both the formation and the re-formation of acetic acid. This behavior is common among weak acids, which do not completely dissociate in water.
12 the products of the neutralization reaction between hydrochloric acid and magnesium hydroxide are
When a mixture of ice and water originally at 0 is heated, the temperature remains constant until all of the ice melts?
When heat is applied during a phase change, there is zero change in temperature. This is because all the heat supplied is used to break the bonds of the solid molecules to form liquid molecules. So in essence, there the temperature remains constant until all solid molecules bond are broken down (until all ice melts into liquid).
So the answer is Yes or True.
Under what conditions will deviations from the "ideal" gas be expected? select all that apply. low temperatures high temperatures low pressure high pressure
Ideal gas law is valid only for ideal gas not for vanderwaal gas. At very low temperatures and very high pressures, real gases deviate from the behavior predicted by gas laws.
What is ideal gas equation?Ideal gas equation is the mathematical expression that relates pressure volume and temperature.
Mathematically the relation between pressure, temperature and volume is given as
PV=nRT
where,
P = pressure of ideal gas
V= volume of gas
n =number of moles of gas
T =temperature
R = Gas constant = 8.314J/K/mo
This law is not valid at very low temperatures and very high pressures because of the interaction between the particles increases and the factor of reduced volume come into picture.
Therefore, at very low temperatures and very high pressures, real gases deviate from the behavior predicted by gas laws.
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Studies involving humans or animals are conducted under strict policies and procedures. This solution addresses which limitation?
A) Lack of proper equipment
B) Size of the system
C) Limited amount of time
D) Ethical Concerns
Answer:
D, concerns
Explanation:
edge 23
What type of reaction is responsible for linking amino acids together to form polypeptides?
Why would you classify hydrogen as a nonmetal 2017?
Pls Help with this Chemistry question
Which of the following energy level changes would give off the most light energy
A.n=5 to n=1
B.n=4 to n=5
C.n=2 to n=5
D.n=5 to n=4
"The correct option is A. [tex]\( n=5 \) to \( n=1 \).[/tex]
In atomic physics, the energy of the emitted photon when an electron transitions from one energy level to another is given by the Rydberg formula:
[tex]\[ E = h \cdot f = R \cdot \left( \frac{1}{n_f^2} - \frac{1}{n_i^2} \right) \][/tex] where \( h \) is Planck's constant, \( f \) is the frequency of the emitted photon, \( R \) is the Rydberg constant for hydrogen, \( n_f \) is the final energy level, and \( n_i \) is the initial energy level.
The energy of the photon is directly proportional to the frequency of the light emitted, and the frequency is inversely proportional to the wavelength of the light. Therefore, the greater the energy difference between the two levels, the higher the frequency of the emitted light and the more energy the light carries.
Let's calculate the energy released for each transition:
[tex]A. \( n=5 \) to \( n=1 \):[/tex]
[tex]\[ E_{5 \to 1} = R \cdot \left( \frac{1}{1^2} - \frac{1}{5^2} \right) = R \cdot \left( 1 - \frac{1}{25} \right) = R \cdot \frac{24}{25} \][/tex]
B. [tex]\( n=4 \) to \( n=5 \):[/tex]
[tex]\[ E_{4 \to 5} = R \cdot \left( \frac{1}{5^2} - \frac{1}{4^2} \right) = R \cdot \left( \frac{1}{25} - \frac{1}{16} \right) = R \cdot \left( -\frac{9}{400} \right) \][/tex]
(Note: This transition actually absorbs energy, as the electron moves to a higher energy level.)
C.[tex]\( n=2 \) to \( n=5 \):[/tex]
[tex]\[ E_{2 \to 5} = R \cdot \left( \frac{1}{5^2} - \frac{1}{2^2} \right) = R \cdot \left( \frac{1}{25} - \frac{1}{4} \right) = R \cdot \left( -\frac{21}{100} \right) \][/tex]
(Again, this transition absorbs energy.)
D. [tex]\( n=5 \) to \( n=4 \):[/tex]
[tex]\[ E_{5 \to 4} = R \cdot \left( \frac{1}{4^2} - \frac{1}{5^2} \right) = R \cdot \left( \frac{1}{16} - \frac{1}{25} \right) = R \cdot \frac{9}{400} \][/tex]
Comparing the magnitudes of the energy changes, it is clear that the transition from \( n=5 \) to \( n=1 \) releases the most energy because it has the largest difference in energy levels. This corresponds to the largest absolute value of the energy change, which means it will give off the most light energy.
The temperature levels in a a nuclear reactor are maintained primarily by the use of
.The temperature levels in a nuclear reactor are maintained primarily by the use of
1. shielding
2. coolants
3. moderators
4. control rods
The process in which water changes from a liquid to a vapor is known as __________.
What conditions lead to the formation of large crystals in an igneous rock?
A triacylglycerol is composed of 3 glycerol molecules joined to a fatty acid.
a. True
b. False
Carbon monoxide (co ) is used as a purifying gas in mond's process to produce nickel from its ores. what type of bonding occurs between the atoms of a co molecule?
Answer is: covalent bond.
Covalent bond is bond between nonmetals. Carbon (C) and oxygen (O) are nonmetals.
Carbon atom and oxygen atom are connected by a triple bond (six shared electrons in three bonding molecular orbitals) that is formed of two covalent bonds and one dative covalent bond.
Dative covalent bond is formed by two electrons derive from the oxygen atom.
Carbon monoxide is a colorless, odorless, toxic and tasteless gas.
1. Nitrogen, oxygen, and fluorine atoms all seem pretty similar, at first. How many valence electrons does an atom of each have? (4 points)
Nitrogen ______ Oxygen ______ Fluorine ______
When a candle is burning is it a physical or chemical change?
The energy released in the fission of a 235u nucleus is about 200 mev. how much rest mass (in kg) is converted to energy in this fission?
To convert 1.00 kg of 235U into energy, about 9.14 × 10^-4 kg of rest mass is converted.
Explanation:The energy released in the fission of a 235U nucleus is about 200 MeV. To find out how much rest mass is converted to energy, we need to calculate the number of 235U atoms in 1.00 kg. One mole of 235U has a mass of 235.04 grams, so there are 4.25 moles of 235U in 1.00 kg. Using Avogadro's number (6.02 × 10^23 U/mol), we can calculate that there are 2.56 × 10^24 atoms of 235U in 1.00 kg. The total energy released is the number of atoms times the given energy per U fission, which is:
(2.56 × 10^24 atoms)(200 MeV/atom) = 5.12 × 10^26 MeV
To convert this to kilograms, we can use the conversion factor 1 MeV = 1.783 × 10^-30 kg, so:
(5.12 × 10^26 MeV)(1.783 × 10^-30 kg/MeV) = 9.14 × 10^-4 kg
Therefore, about 9.14 × 10^-4 kg of rest mass is converted to energy in this fission.
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