The experiment performed by Albert Einstein that proved the existence of photons and earned him a Nobel Prize was the Photoelectric Effect Experiment.
The photoelectric effect experiment was performed by Albert Einstein in 1905. This experiment proved that light consists of discrete energy packets called photons. It was a significant breakthrough in the field of physics and earned Einstein a Nobel Prize in 1921.The photoelectric effect is the process in which electrons are emitted from the surface of a metal when it is exposed to light. Einstein proposed that light energy is not continuous but consists of discrete packets of energy called photons.
The energy of a photon is proportional to its frequency, and this energy is transferred to the electrons, causing them to be ejected from the metal's surface. The photoelectric effect experiment demonstrated that the number of electrons emitted depends on the frequency of the light and not on its intensity. When the light's frequency is lower than a certain threshold value, no electrons are emitted, regardless of the light's intensity.
Therefore, the experiment performed by Albert Einstein that proved the existence of photons and earned him a Nobel Prize was the Photoelectric Effect Experiment. This experiment demonstrated that light energy is not continuous but consists of discrete packets of energy called photons.
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7. Which of the following elements is diatomic?
Mg
Mn
Sn
F
What is the mass of a bar of zinc measuring 2.5 cm by 4.0cm by 6.0cm if the density of zinc is 7.62cm
D=
M=
V=
The mass of the sample is the product of its volume and density. The mass of the zinc sample is 457.2 g.
What is density?
Density of a sample is its measure of mass per unit volume. It tells how much denser the substance is in a given volume. The volume of the substance is the space occupied by it.
Volume of a solid is the product of its length, breadth and height.
Given the dimensions of Zn sample is 2.5, 4 and 6 cm.
volume = 2.5 × 4 × 6 cm
= 60 cm³
Density = 7.62 g/cm³.
Mass of the sample is the product of its volume and density. Thus, mass of zinc sample is:
mass of Zn = volume × density
= 7.62 g/cm³ × 60 cm³
= 457.2 g.
Therefore, the mass of the Zn sample is 457.2 g.
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which elements would be the equivalent of the noble gases
The elements that would be the equivalent of the noble gases are the group 18 elements. This group is also known as the noble gases.
The elements in this group are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). These elements are called noble gases because they are very stable and don't easily react with other elements. Their electron configurations make them particularly unreactive. They all have a full outer shell of electrons, which makes them stable. In addition, these elements have very low boiling points and are all gases at room temperature. Additionally, noble gases have low boiling points, existing as gases at room temperature. These unique properties make noble gases valuable in various applications, including lighting, cryogenics, and as non-reactive atmospheres in industrial processes.
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the form of energy that your lunch represents is?
A) electrical
B) chemical
C) thermal
D) nuclear
What volume of 0.100M NaOH is required to completely neutralize 15.00mL of 0.100M H3PO4?Select one:a.45 mLb.15 mLc.60 mLd.30 mL
45 ml of 0.100M NaOH is required to completely neutralize 15.00mL of 0.100M H₃PO₄.
A neutralization reaction is when an acid and a base react to shape water and salt and includes the aggregate of H+ ions and OH- ions to generate water. The neutralization of a robust acid and strong base has a pH same to 7.
Neutralization is a chemical reaction in which acid and a base react quantitatively with each different. In a response in water, neutralization results in there being no extra hydrogen or hydroxide ions present within the solution.
Given;
M₁ = 0.100M NaOH
valance factor n₁ = 1
V₁ = ?
M₂ = of 0.100M H3PO4
valance factor n₂ = 3
V₂ = 15.00mL
M₁n₁V₁ = M₂n₂V₂
V₁ = M₂n₂V₂/M₁n₁
= 0.1 × 3 × 15 / 0.1 × 1
= 45 ml
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balance the following equation __N2+__O2→__N2O
Answer:
2N2+02>_2N20
Explanation:
u have to use rap formula
A solution containing which one of the following pairs of substances will be a buffer solution? A solution containing which one of the following pairs of substances will be a buffer solution? AgBr, HBr CuCl, HCl CsI, HI KI, HI none of the above
Which of the halves that of compounds will make up the buffer solution in a solution Any of the halves that of substances, when present in a solution, will make it a buffer solution None of the above.
What exactly is a buffer solution?As a result, it's essential to have liquids whose pH doesn't really alter even when strong alkalies nor strong acids are added. These are referred to as buffer solutions. The ability of a buffer to withstand a change in pH is known as buffer capacity.
What makes it a buffer solution?it can neutralize a small amount of additional acid or base, the pH of the liquid is kept comparatively steady.
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9 A certain type of bacteriophage replicates by incorporating its own genetic material into the host genome
where it is passed on to future generations over time. This type of viral reproduction is known as
A) binary fission
B) budding
C) the lysogenic cycle
D) the lytic cycle
Answer: b
Explanation: cheese
A sample of gas at 25.0°C and 1.00 atm has a volume of 3.00 L. What volume will this gas occupy at 45.0°C and 1.00 atm?
*1.67L
*2.81L
*5.40L
*3.20L
The answer is (D) 3.20L; the gas will occupy a volume of 3.20 L at 45.0°C and 1.00 atm.
What is combined gas law?The combined gas law is a gas law that combines Boyle's law, Charles's law, and Gay-Lussac's law. It relates the pressure, volume, and temperature of a fixed amount of gas. The law states that the product of the pressure and volume of a gas is directly proportional to the product of its temperature and the number of moles of gas present.
To solve this problem, we can use the combined gas law,
(P1V1)/T1 = (P2V2)/T2
Where:
P1 = initial pressure
V1 = initial volume
T1 = initial temperature
P2 = final pressure (which is the same as the initial pressure in this case)
V2 = final volume (what we're trying to find)
T2 = final temperature
Plugging in the given values, we get:
(1.00 atm x 3.00 L) / (298.15 K) = (1.00 atm x V2) / (318.15 K)
Solving for V2, we get:
V2 = (1.00 atm x 3.00 L x 318.15 K) / (298.15 K x 1.00 atm)
V2 = 3.20 L
Therefore, the gas will occupy a volume of 3.20 L at 45.0°C and 1.00 atm.
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Following the laser stimulation of the photostimulable phosphor, the excited electrons are ____.
Photostimulation is a process that includes the absorption of electromagnetic radiation, particularly light, by chromophores or fluorophores to initiate a cellular response. Light-induced physiological responses include vision, plant growth, and photomorphogenesis, among others.
Following the laser stimulation of the photostimulable phosphor, the excited electrons are trapped in the conduction band.What is photostimulation?
Photostimulation is a process that includes the absorption of electromagnetic radiation, particularly light, by chromophores or fluorophores to initiate a cellular response. Light-induced physiological responses include vision, plant growth, and photomorphogenesis, among others.
Laser stimulation
Laser stimulation is the use of laser light to control cellular activity, frequently using ion channels or opsins that have been genetically modified to respond to light. While traditional electrophysiology techniques rely on electrical stimulation of cells, optogenetics employs light as a means of non-invasive and selective manipulation of neural systems or tissues.
Photostimulable
Photostimulable refers to the phosphor's ability to release energy after excitation by light, which allows for energy transfer to the electrons that are trapped in the conduction band. In conclusion, we can say that following the laser stimulation of the photostimulable phosphor, the excited electrons are trapped in the conduction band.
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Calculate the frequency of 4.1 x 10^-19
flowback waste water is disposed of in a process called deep well injection which plumps large quantities of waste water down into porous sandstone and limestone rock formations underground. what potential problems could result from this?
The potential problems associated with a deep well injection is that it can result in polluting underground water.
If there are many wells nearby, injecting wastewater into subsurface rock strata can be problematic. Consider porous sandstone, which contains minute openings. Water under high pressure, such as wastewater from fracking, can penetrate the sandstone and travel with underground water.
An injection well is employed to inject fluid underground into porous geologic formations. These subterranean structures might be anything from a modest soil layer to thick sandstone or limestone. Water, wastewater, brine (salt water), and water that has been combined with chemicals are all examples of injected fluids.
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Which is an example of variations in a population of organisms
Answer:
The gravitational potential energy it had from being above the ground is converted to kinetic energy as the rock falls. As kinetic energy increases, the velocity of the rock will also increase. However, if one considers the air, the rock will lose energy as it falls due to air resistance. If the cliff is high enough, the acceleration due to gravity and the air resistance due to the velocity will be exactly equal and there will be no change in kinetic energy.
Explanation:
hope this helps
b) explain the meaning of the term ld50 (ed50). what is the ld50 concentration of cuso4 for brine shrimp?
The LD50 concentration of CuSO₄ for brine shrimp is reported to be around 2.75 ppm (parts per million), which means that if 50% of the brine shrimp population were exposed to this concentration of CuSO₄, they would die as a result of the exposure
The LD50 and ED50 are both terms commonly used in toxicology to express the effectiveness or toxicity of a substance.
The LD50, which stands for "lethal dose 50," is the amount of a substance required to cause death in 50% of the test population. It is typically expressed in units of milligrams or micrograms of the substance per kilogram of body weight of the test animal.
On the other hand, the ED50 stands for "effective dose 50," which is the amount of a substance required to produce a desired effect in 50% of the test population. It is commonly used in pharmacology to measure the potency of a drug.
In the case of the brine shrimp, the LD50 concentration of CuSO4 (copper sulfate) would be the amount of CuSO4 that would cause the death of 50% of the shrimp population in a given test. It is important to note that the LD50 can vary depending on various factors such as the species being tested, the method of exposure, and the duration of exposure.
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I really need help on this it’s a major grade!!
Can some one please write an amazing long essay explaining how life was prior to the invention you selected, how life is different today, and whether the result is
positive or negative.
PLEASE HELP QUICK ITS DUE TODAY 2/26/2021 AT 11:59!
complete combustion of 2.00 g2.00 g of a hydrocarbon produced 6.16 g6.16 g of co2co2 and 2.84 g2.84 g of h2o.h2o. what is the empirical formula for the hydrocarbon? insert subscripts as necessary. empirical formula:
The molecular formula of a compound is a whole number multiple of its empirical formula. The empirical formula of the hydrocarbon is C₄H₉.
What is empirical formula?The empirical formula of a compound can be defined as the formula which gives the simplest whole number ratio of atoms of various elements present in one molecule of the compound.
Here moles of 'C' = moles 'CO₂' = 6.16 / 44 = 0.14 moles
Moles of 'H' = 2 × moles 'H₂O' = 2 × 2.84/18.02 = 0.315 moles
Divide both number of moles by 0.14. Then we get
1 mol 'C' and 2.25 mol 'H'
Multiply both with 4 to obtain a whole number.
Then the number of carbon is 4 and that of hydrogen is 9.
Thus the empirical formula is C₄H₉.
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How many total electrons must be transferred to form one formula unit of Al2O3?
To form one formula unit of Al2O3, a total of 12 electrons (6 from aluminum and 6 from oxygen) must be transferred.
The compound Al2O3, commonly known as aluminum oxide, is formed when two aluminum atoms and three oxygen atoms bond. To determine the number of total electrons that must be transferred to form one formula unit of Al2O3, we first need to find the number of electrons that are present in one formula unit of Al2O3.
Aluminum has an atomic number of 13, which means it has 13 protons and 13 electrons in a neutral atom. Each aluminum atom in Al2O3 contributes 3 electrons, and since there are two aluminum atoms in one formula unit of Al2O3, the total number of electrons contributed by aluminum atoms is 6.
Oxygen has an atomic number of 8, which means it has 8 protons and 8 electrons in a neutral atom. Each oxygen atom in Al2O3 contributes 2 electrons, and since there are three oxygen atoms in one formula unit of Al2O3, the total number of electrons contributed by oxygen atoms is 6.
Therefore, to form one formula unit of Al2O3, a total of 12 electrons (6 from aluminum and 6 from oxygen) must be transferred.
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Which element to demontrate the tronget London diperion force and have the highet boiling point
Fluorine, Neon, and Xenon element to demonstrate the strongest London dispersion force and have the highest boiling point.
London dispersion forces are the weakest type of intermolecular forces and are present in all molecules. These forces arise from the temporary separation of positive and negative charges within a molecule, resulting in the formation of instantaneous dipoles. The strength of London dispersion forces depends on the size and shape of the molecule, as well as the distribution of electrons within the molecule. In general, larger and more polarizable molecules tend to have stronger London dispersion forces. Some examples of elements that tend to demonstrate strong London dispersion forces and have high boiling points include: Fluorine: Fluorine is a highly electronegative element with a large atomic radius, making it highly polarizable and able to form strong London dispersion forces. Fluorine has a boiling point of -188.14 °C (-307.57 °F), which is the highest among the elements. Neon: Neon is a noble gas with a relatively large atomic radius and a high electron affinity, resulting in strong London dispersion forces. Neon has a boiling point of -246.06 °C (-410.97 °F). Xenon: Xenon is a noble gas with a large atomic radius and a high electron affinity, resulting in strong London dispersion forces. Xenon has a boiling point of -108.1 °C (-162.58 °F).
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a compound of carbon and hydrogen contains 92.3% c and has a molar mass of 78.12 g/mol. what is its molecular formula?
The molecular formula of the compound is C6H6, which is benzene.
To determine the molecular formula, we need to first find the empirical formula and then determine the molecular formula based on the molar mass.
Assuming 100 g of the compound, the percentage composition by mass of carbon and hydrogen can be calculated as follows:
Mass of carbon = 92.3 g
Mass of hydrogen = 100 g - 92.3 g = 7.7 g
Next, we can convert the mass of each element to moles using their respective atomic masses:
Moles of carbon = 92.3 g / 12.01 g/mol = 7.69 mol
Moles of hydrogen = 7.7 g / 1.01 g/mol = 7.62 mol
To obtain the simplest whole number ratio of atoms in the compound, we divide the number of moles of each element by the smallest number of moles:
C: 7.69 mol / 7.62 mol ≈ 1
H: 7.62 mol / 7.62 mol = 1
Therefore, the empirical formula of the compound is CH.
To determine the molecular formula, we need to know the molar mass of the compound. The molar mass of the empirical formula CH is:
Molar mass of carbon = 12.01 g/mol
Molar mass of hydrogen = 1.01 g/mol
Molar mass of CH = (1 × 12.01 g/mol) + (1 × 1.01 g/mol) = 13.02 g/mol
To calculate the molecular formula, we divide the experimental molar mass (78.12 g/mol) by the empirical formula mass (13.02 g/mol):
Molecular formula factor = 78.12 g/mol ÷ 13.02 g/mol ≈ 6
The molecular formula is obtained by multiplying the subscripts in the empirical formula by the molecular formula factor:
Molecular formula = (C1H1) × 6 = C6H6
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What is the name of this formula?
Answer:
Iron(III) Oxide
Explanation:
You can tell that this formula is for the molecule Iron(III) oxide because it has two iron atoms and three oxygen atoms.
Fun Fact: There are three main types of iron oxides, with this being one of them.
Hope this helped! :^)
Question
2 Points
Describe the path of a light ray that hits a mirror at its vertex.
A. It is reflected back through the focus.
B. It is absorbed by the mirror.
C. It is reflected out at exactly the same angle at which it came in,
according to the Law of Reflection.
D. It is reflected back parallel to the principal axis.
SUBMI
Hurry
Answer:D
Explanation:
Answer:
D
Explanation:
Which of the following is a non-polar molecule (have no permanent bond dipole moment)? Select the correct answer below: O CO2 be CO O CHO O CHO
CO₂ is a non-polar molecule. The correct answer is CO₂.
CO₂, which is carbon dioxide, is a non-polar molecule because it has a symmetrical shape and its bond dipoles cancel each other out. In CO₂, the carbon atom is bonded to two oxygen atoms. The molecule has a linear shape, with the carbon atom in the center and the oxygen atoms on either side.
The bond between the carbon atom and each oxygen atom is polar because oxygen is more electronegative than carbon, creating a partial negative charge on the oxygen atoms and a partial positive charge on the carbon atom. However, because the molecule is linear, the bond dipoles are equal in magnitude and opposite in direction, effectively canceling each other out.
This results in a non-polar molecule overall, with no permanent bond dipole moment. To summarize, CO₂ is a non-polar molecule because its bond dipoles cancel each other out due to its symmetrical linear shape. Hence, CO₂ is the correct answer.
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Calculate the mass of 1.3mol of Hydrogen Sulfide
Answer:
mass = 44.2 g
Explanation:
We are asked to calculate the mass of 1.3 mol of hydrogen sulfide, H₂S.
To do this, we can use the following formula:
\(\boxed{\mathrm{mass = No. \ of \ moles \times M_r}}\).
The \(\mathrm{M_r}\) (relative molecular mass) of H₂S is:
\(\mathrm{M_r}\) = (2 × 1) + 32
= 2 + 32
= 34
Therefore, using the formula above and substituting the data, we get:
mass = 1.3 × 34
= 44.2 g
Does a reaction occur when aqueous solutions of magnesium nitrate and iron(ii) sulfate are combined?
Yes, a reaction occurs.
When Magnesium nitrate Mg(NO3)2 and iron (II) sulphate (FeSO4) are combined, double displacement reaction takes place.
Double displacement reaction - A reaction in which two compounds exchange their cations or anions (ions) to form two new compounds.AB + CD → AD + CB
Ionic equation according to the question-
FeSO4 + Mg(NO3)2 → Fe(NO3)2 + MgSO4
Here, Iron (II) sulphate reacts with Magnesium nitrate to form Iron nitrate and magnesium sulphate by undergoing double displacement reaction.
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Yes, there is a reaction when iron (II) sulphate (FeSO₄) and magnesium nitrate Mg(NO₃)₂ are mixed.
Double displacement reaction occurs when iron (II) sulphate (FeSO₄) and magnesium nitrate Mg(NO₃)₂ are mixed.
Displacement reaction- When a less reactive element is pushed out of a compound that also contains a more reactive ingredient, the result is a displacement reaction. The less reactive element is now pure and left alone following a displacement reaction.
AB + C → A + CB
whereas,
Double displacement reaction- In a double displacement reaction, two compounds swap cations or anions (ions) to create two new molecules.
AB + CD → AD + CB
FeSO₄ + Mg(NO₃)₂ Fe(NO₃)₂ + MgSO₄ is the ionic equation in response to the query.
Here, a double displacement reaction occurs between magnesium nitrate and iron (II) sulphate to produce iron nitrate and magnesium sulphate.
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hjgkhbmhjmhjzdsj,zdzkjfls.
Cotton in solid but it floats on water. Why?
WILL MARK BRAINLIEST!!! Think about how to determine the molar mass of NH4OH,
In that amount of ammonium hydroxide, how many moles
would you have? In other words, the molar mass of any
compound is equal to
2 moles
1 mole
4 moles
0,5 moles
The reaction between C₂H2O, and O₂ is represented by the balanced equation above. In an experiment, 0.30 mol of CO₂ was produced from the reaction of 0.05 mol of C₂H₂O with excess
O₂. The reaction was repeated at the same temperature and in the same container, but this time 0.60 mol of CO₂ was produced. Which of the following must be true?
There must have been 0.10mol of \(C_{2} H_{2} O\) in the container at the beginning.
\(C_{2} H_{2} O\) + \(2O_{2}\) = \(2CO_{2}\) + \(H_{2} O\)
The above reaction makes it quite evident that 1 mol of \(C_{2} H_{2} O\) combines to create 2 mol of \(CO_{2}\) and \(O_{2}\) is given in excess that \(C_{2} H_{2} O\) alone controls a product's formation. Therefore, here, O is an excess reactant and \(C_{2} H_{2} O\) is a limiting reactant.
It takes 6 times as much \(C_{2} H_{2} O\) to produce 1 mol of \(CO_{2}\) from 0.05 mol of \(C_{2} H_{2} O\).
Now, 0.6 divided by 6 mol of reactant is required for 0.60 moles of \(CO_{2}\)to produce, which translates to
moles of \(C_{2} H_{2} O\) = 0.6/6 = 0.1 mol .
Therefore, \(C_{2} H_{2} O\) must have been present in the container in an initial concentration of 0.10mol.
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How many moles of NaF are contained in 258.6 mL of 0.0296 M NaF solution?
Answer:
Approximately 7.65
Explanation:
math.
skillz.
What is one bad thing that can happen when humans build more and more streets and buildings?
Answer:
there will be less and less space
Explanation: