The term "shielding effect" describes how the presence of core/core electrons reduces the positive charge experienced by the core/valence electrons.
What is shielding effect?The shielding effect is known as the reduction of the effective nuclear charge of the electron cloud as a result of the change in the attractive force acting on the electrons of the atoms. This particular case of electric field filtering is unique. Many projects in the field of materials science also consider this effect. The term "shielding effect" describes the reduction in positive charge experienced by the outer/valence electrons as a result of the presence of inner/core electrons. It prevents the outer/valence electrons from fully benefiting from the positive charge coming from the nucleus.
Due to the increased amount of core electrons, the shielding is enhanced when traveling downhill in groups. The amount of core electrons remains constant as it does not change as it moves over a period of time.
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What type of reaction is this? (Multiple choice)
This reaction is an example of double displacement reaction.
What is double displacement reaction?When two reactants change ions to create two new compounds, the reaction is referred to as a double displacement reaction. Double displacement reactions usually result in the development of a precipitate as a product.
The positive-charged cations and negative-charged anions of the reactants swap places (double displacement) to generate two new products in this sort of reaction. Also called: A metathesis reaction or a double replacement reaction are other names for a double displacement reaction.
The equation becomes:
AlBr₃ + K₂SO₄ → KBr + Al₂(SO₄)₃
Aluminium bromide (AlBr₃) reacts with potassium sulphate (K₂SO₄) to form potassium bromide (KBr) along with aluminium sulphate (Al₂(SO₄)₃).
Balanced reaction becomes:
2AlBr₃ + 3K₂SO₄ → 6KBr + Al₂(SO₄)₃
2 mol 3 mol 6 mol 1 mol
In this reaction, two moles of aluminium bromide react with three moles of potassium sulphate to produce six moles of potassium bromide along with one mole of aluminium sulphate.
So, this reaction is an example of double displacement reaction.
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Which of the following best demonstratesthat a chemical change has taken place?
The mass of the salt solution, beaker and nails
decreased.
The volume of the salt solution has decreased.
The salt solution was discolored after a week.
The iron nail is still undissolved in the solution
after a week.
Answer:
the last one
Explanation:
THE IRON NAIL IS STILL UNDISSOLVED IN SOLUTION AFTER A WEEK
A chamber contains equal molar amounts of C₂H₂, CH₄, and H₂. If the total chamber pressure is 5.00 atm, then the partial pressure of C₂H₂ is:
Answer: 1.67 atm
Explanation:
Since the molar amounts are equal, this means that the partial pressure of acetylene is 1/3 of the total chamber pressure.
for a radical addition reaction involving hbr and propene, sort each reaction step into initiation, propagation and termination steps.
For a radical addition reaction involving HBr and propene , includes initiation , propagation and termination. the reaction is given as :
CH₃CH=CH₂ + HBr + peroxide ----> CH₃CH₂CH₂Br
1) The steps involves in the initiation steps are :
RO - RO ----> 2RO°
RO° + H- Br ----> ROH + Br°
2) this steps involves the propagation steps are :
CH₃ - CH = CH₂ + Br° ---> CH₃ - CH -CH₂ - Br
CH₃ - °CH - CH₂ - Br + H - Br ----> CH₃ - CH₂ - CH₂ - Br + Br°
3) the termination step include :
Br° + Br° ----> Br - Br
2 CH₃ - °CH - CH₂ - Br ---> CH₃ - CH - CH₂ - Br
|
CH₃ - CH - CH₂ - Br
CH₃ - °CH - CH₂ - Br + Br° ---> CH₃ - CH - CH₂ - Br
|
Br
Thus, the above steps are involved in the radical addition reaction.
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Why do you think the Haití earthquake in 2010 happened?
Both Saturday's earthquake and the one in 2010 are thought to have been caused by the Enriquillo-Plantain Garden fault system, according to the United States.
What is the Haitian problem with the Enriquillo-plantain garden?The Enriquillo-Plantain Garden fault zone (EPGFZ or EPGZ) is indeed a network of active coaxial left lateral-moving strike - slip faults faults that extends along the southern coast of Hispaniola, the island that is home to Haiti and the Dominican Republic.
Where is the fault system between Enriquillo and Plantain Garden?
As one of Haiti's main plate-bounding fault systems, the Enriquillo-Plantain Garden fault zone is very well known. Initially believed to be the cause of the Mw 7.0 earthquake that struck Port-au-Prince on January 12, 2010, the strike-slip fault is located close to the city.
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Use the gizmo to explore whether the number of atoms present affects the half-life that you measure. describe your findings below:
In contrast, the ratio and total quantity of stable atoms are defined by the half-life.Whatever the initial number of atoms, the percent of decrease is constant.They can determine the quantity of original carbon-14 by using the carbon-14 half-life of 5,730 years and the ratio of carbon-12 to carbon-14.
What is the rate of change of the radioactive atom number?Since approximately half of the nuclei of each atom decay with each half-life, the number of radioactive atoms falls as the number of half-lives grows.
Amount has an impact on half-life?A longer dose interval will result from a longer half-life, which is reliant on both clearance and volume of distribution. For example, a CYP1A2 or CYP2C19 substrate can cause a decrease in clearance.
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After considering the results of the classification tests, the possibilities can be narrowed down further by determining the melting point of the
A derivative.
B Schiff addition product.
C iodoform.
D triiodo compound.
After considering the results of the classification tests, the possibilities can be narrowed down further by determining the melting point of the B Schiff addition product.
What two facts can you infer about your product based on its melting point range?
A compound's melting point is helpful in two ways: it provides information on the composition's identity and degree of purity. Impurities will affect a compound's melting point, resulting in broader and lower melting point ranges.
First, the solubility test must be performed in order to remove soluble contaminants from the target molecule. The desired chemical and the soluble impurities are dissolved in a minimum of near or boiling solvent once a suitable solvent has been selected. The solution is then given time to gradually cool.
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Find the number of grams in a 1.25 M solution of potassium nitrate (NO3) if we have
160 ml of the solution.
Answer:
12.4 g
Explanation:
M=1.25M
v=0.16L
molar mass = 62 g per mole
M=n/v
n=M*v
n=1.25M*0.16
n=0.2moln=mass of a substance /molar massmass of substance = n * M
m=0.2mole *62 g/mole
m=12.4g
Perform the following operation
and express the answer in
scientific notation.
6.50×105 +5.40×104
? ]×10[?]
According to scientific notation, the answer of the operation is 7.04×10⁵.
What is scientific notation?Scientific notation is defined as a way of expressing numbers which are too large or too small so that they can be easily written in decimal form. It can be referred to the scientific form or the scientific index form or even the standard form.
Base ten notation is used by scientists, engineers as it helps in simplification of arithmetic operations. It contains the significant figures which include all non-zero numbers , the zeroes between significant digits and zeroes which are needed to be significant.
In scientific notation, the base should always be ten. The exponent should be a non-zero integer and it can be either positive or negative.In this case answer is obtained as 6.50×10⁵ +0.540×10⁵=7.04×10⁵.
Thus, the answer in scientific notation is 7.04×10⁵.
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Which of the following is a hydroxide ion?
Select one:
O a. H*
Ob. H30
O c. (OH)*
O d. 0²-
Answer:
a
Explanation:
hope this helps for now
The alkyl halide shown below undergoes an elimination reaction. Select all possible elimination products from the given structures provided below. (1 pts)}
OPTION A and OPTION D are the possible products from the given structures provided.
Alkyl Halides: What Are They?
Alkyl halides are chemical compounds that are frequently generated from alkanes that include one or more halogens. They are also known as haloalkanes or halogenoalkanes. Alkyl halides are also a part of the larger category of halocarbons.What does alkyl halide mean?
An alkyl halide, as its name indicates, is a hydrocarbon molecule in which halogens stand in for one or more hydrogen atoms. Fluorine, chlorine, bromine, and iodine are among them. R-X, where X is a halogen and R is an alkyl group, is the general structure.What varieties of alkyl are there?
Make sure you understand the definitions of and use for the essential phrases listed below.Alkyl group, methyl group, isobutyl group, sec-butyl group, tert-butyl group, primary carbon, and secondary carbon.To know more about alkyl checkout this link:
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Fill in my blanks
Mass - measured in ____ or tells the amount of matter in an object.
Volume - the amount of ____ that’s an odject _____ _____
Answer:
Mass - measured in kilogram or tell the amoout of matter in an object.
Volume - is the amout of space that's an object taken
Label each diagram (A, B, and C) as either convergent plate boundary, divergent plate boundary, or transform plate boundary. three plate boundaries
Diagram A is a divergent plate boundary, B is a convergent plate boundary and C is a transform plate boundary.
What are tectonic boundaries?Plate tectonics are boundaries between two or more plates moving towards each other, away from each other or past each other. When these occur they are known as either convergent, divergent or transform plate boundaries.
A convergent plate boundary, the tectonic plate converge by subduction, where the thin ocean crust slides beneath thick crust. It is divergent when the linear features are moving away from each other. For transform plate, the broad zone slides northwestward past the north plate.
The full question is:
Label each diagram (A, B, and C) as either convergent plate boundary, divergent plate boundary, or transform plate boundary. three plate boundaries
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How much energy is required to heat 100g of water at 25°C to steam at 125°C?
The amount of energy required to heat 100 g of water is 268000 J.
What is energy?Energy is the ability or the capacity to perform work.
To calculate the amount heat energy required to change the water to steam, we use the formula below.
Formula:
Q = CmΔt+cΔt........... Equation 1Where:
Q = Amount of energym = Mass of the waterΔt = Change in temperature of the waterc = Latent heat of vapourization of waterC = Specific heat capacity of the waterFrom the question,
Given:
m = 100 g = 0.1 kgΔt = 125-25 = 100 °CC = 4200 J/kg°C. c = 2260000 J/kgSubstitute these values into equation 1
Q = (0.1×100×4200)+(2260000×0.1)Q = 42000+226000Q = 268000 JHence, the amount of energy required is 268000 J.
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It's a great day at the beach, and you're there for some fun and sun! One reason the day is so special is that the weather is so pleasant—sunny and warm. Energy from the sun warms the beach by (1) _______________. The breeze is warm enough to keep you warm, but it also keeps you from overheating. Ocean breezes move because energy is (2) ________________. When you lie down on the sand, you spread a beach towel down so that the sand will not make you too hot by (3) ______________________.
It's a great day at the beach, and you're there for some fun and sun! One reason the day is so special is that the weather is so pleasant—sunny and warm. Energy from the sun warms the beach with Radiation. The breeze is warm enough to keep you warm, but it also keeps you from overheating. Ocean breezes move because energy is Convection. When you lie down on the sand, you spread a beach towel down so that the sand will not make you too hot by transferring heat by Conduction.
Radiation is energy that comes from a source and travels through space at the speed of light. This energy has an electric field and a magnetic field.
Heat is transferred through convection, which is the large-scale movement of molecules inside gases and liquids. Conduction is used to move heat from the object to the fluid initially, but fluid motion is responsible for the bulk of the heat transfer.
Heat energy is transferred through the mechanism of conduction when nearby atoms or molecules collide. In solids and liquids, where particles are more closely spaced, conduction happens more easily than in gases, where particles are more widely spaced.
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Given a titration reaction, the titrant concentration and volume, and the analyte volume and mass, identify the titrant to analyte stoichiometry
Given a titration reaction, titrant concentration and volume, the analyte volume and mass, then to identify titrant to analyte stoichiometry : Put the coefficients of each compound in order and simplify if possible.
How do you identify analyte and titrant?During titration, there are two solutions: analyte and the titrant. Analyte is the unknown solution for which you would like to know the concentration or the equilibrium constant. The titrant is the known solution which has a precise and accurate concentration.
The stoichiometric point is the point where an equal amount of acid and base is present to neutralize chemical reaction. Known reagents added to chemical reaction are called titrant and unknown solution is called analyte.
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1. Identify the anode and the cathode in the following combinations of half-cells. Remember that Ecell Eox + Ered and that Egell must be positive in order to function as a voltaic cell. You may use tables of standard reduction potentials in your text. a) Fe/Fe and Zn/Zn anode cathode b) Ag/Ag' and Sn/Sn c) Zn/Zn*2 and Cu/Cu2 d) Sn/Sn2 and Al/Al 2. Sketch a voltaic cell consisting of lead anode and a copper cathode. Clearly label both electrodes, the voltmeter, salt bridge, the direction of electron flow, and suggest possible salts which could be dissolved in the half cells to complete the cell.3. Give the cell notation for a voltaic cell consisting of a metallic iron anode immersed in a solution of FeCly, and a metallic copper cathode immersed in aqueous Cu(NO3)2.
a) Fe is the anode and Cu is the cathode. b) Ag is the cathode and Sn is anode c) Zn is anode and Cu is cathode d) Al is cathode and Sn anode.
2. What type of salts are used in the half cells to complete the cell?Possible salts that can be dissolved in half cell to complete the cell : potassium chloride (KCl) and potassium nitrate (KNO3) are better inert salts.
A salt bridge's main function is to maintain electrical neutrality between two beakers and to do so the salt used must be inert. The ions must to move to and forth between the two half cells.
3. Cell notation for a voltaic cell consisting of metallic iron anode immersed in a solution of FeCl3 and a metallic copper cathode immersed in aqueous Cu(NO3)2.
Fe°|Fe3+|| Cu2+|Cu
Left electrode -- anode and right electrode -- cathode.
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Consider the kinds of intermolecular forces present in the following compounds, and rank the substances in likely order of decreasing boiling point: H2SH2S (34 amuamu), CH3OHCH3OH (32 amuamu), C2H6C2H6 (30 amuamu), ArAr (40 amuamu).
In order of decreasing boiling point, CH3OH > H2S > C2H6 > Ar. The strongest types of bonding are ionic, covalent, hydrogen, and van der waals forces, in that order.
Give examples of each of the three forms of intermolecular forces?London dispersion forces (LDF), dipole-dipole interactions, and hydrogen bonds are different intermolecular forces. All substances have LDF, but molecules can have combination of these three types of intermolecular interactions.
What makes dipole-dipole the most powerful?The dipole-dipole forces increase with increasing polarity. Dipole-dipole forces are in an unique (stronger) case in this situation. It is possible for it to exist between a molecule with an N, O, or F atom that has a hydrogen atom bonded to it directly and another molecule with an N, O, or F atom that has a lone pair of electrons.
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An unknown salt AS X H₂O was analyzed and found to contain 16.4 percent
.
water. If the anhydrous salt has a formula mass of 183 amu, find the water of
crystallization (X) for the hydrate.
the unknown salt AS X H₂O was analyzed and found to contain 16.4 percent water. If the anhydrous salt has a formula mass of 183 amu then the water of crystallization (X) for the hydrate is 7.
What is anhydrous salt?Those compound from which all the water molecules are removed is termed as anhydrous salt. These types of compounds can be used as desiccants (drying agents) that means they can absorb water from their surrounding.
Water of crystallization:In a crystalline state of a salt the no. of molecules of water are present in a definite molecular proportion is known as Water of crystallization.
Example : CaSO4.5H2O consist of 5 Water of crystallization.
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Analyses revealed that 16.4% of the unidentified salt AS X H2O contained water. The hydrate's water of crystallisation (X) is 7 if the anhydrous salt's formula mass is 183 amu.
What is sodium anhydrous?
Anhydrous salts are substances from which all of the water molecules have been eliminated. These kinds of substances can serve as desiccants, or drying agents, by absorbing water from their surroundings.
Water of crystallisation is the term used to describe the quantity of water molecules present in a specific molecular proportion in a salt that has crystallised.
Example: The water of crystallization for CaSO4.5H2O is 5.
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according to the spectrochemical series, which of the following ligands has the strongest splitting field?
The increasing order of the crystal field splitting- I− < Br− < S2− < SCN− < Cl−< N3 < F−< NCO−< OH−<C2O42−< O2−< H2O < acac− < NCS− < CH3CN <gly <py < NH3 < en < bipy < phen < NO2− < PPh3 < CN− < CO.
Describe the spectrochemical sequence.The ligands (affections to a metal ion) are listed in the spectrochemical series according to the strength of their field. The series was created by superimposing various sequences acquired from spectroscopic research because it is impossible to generate the full series by examining complexes with the single metal ion.
Which ligands in the spectrochemical series are strong field ligands?The ligands cyanide and CO are classified as strong-field ligands, whereas the halides are weak-field ligands. Ligands such as water and ammonia are said to create medium field effects.
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Which of the following characteristics of K+ channels are important for the selectivity for K+ rather than other ions?
K+ channels are important because carbonyl groups lining the wall of the pore and can interact with the unsolvated K+ ion, balancing the energy needed to remove the hydration shell.
What is the role of K + ion channels in an action potential?Potassium channels play a role in repolarization of the membrane, which follows membrane depolarization by Na, and in some cases Ca, channels during the action potential; this is necessary for returning the membrane to a negative potential to terminate the action potential signal.
What effect does opening K+ channels have on membrane potential?Opening of K+ channels in cell membranes with resulting increase in K+ conductance, shifts the membrane potential in a hyperpolarizing direction ,the K+ equilibrium potential. Hyperpolarization reduces the opening probability of ion channels involved in membrane depolarization and excitation is minimized.
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A mixture of gases for the synthesis of ammonia with a mass of 1000.0 g at a temperature of 0 0C and pressure 2 atm occupies a volume of 1000.0 L.
1. Determine the volume fraction of gases in the mixture (in percent).
2. Write the equations for ammonia synthesis reactions in laboratories (3 methods).
3. Give the equation for the reaction of ammonia: a) with metal; b) with a non-metal; c) with metal oxide; d) with acid; e) with salt.
Answer:
1. or A. : .209%
B. : 1000.0 x .20
Explanation:
what is the equation for the equilibrium constant of 2 CrO 4 2 − (aq) + 2 H + (aq) ⇌ Cr 2 O 7 2 − (aq) + H 2 O (l)
The equation for the equilibrium constant K = [ Cr₂O₇²⁻] [ H₂O ] / [ Cr₂O₇²⁻ ]² [ H⁺]².
What is equilibrium constant ?For a chemical reaction, the equilibrium constant can be defined as the ratio of reactant to product that is used to determine chemical behavior. At equilibrium, the forward reaction rate equals the backward reaction rate.
Equilibrium constants vary with temperature and are unaffected by reaction quantities, catalysts, or inert materials. Furthermore, it is unaffected by reactant concentrations, pressures, or volumes. In general, the temperature dependence of the equilibrium constant is determined by H of the reaction.
Thus, The equation for the equilibrium constant K = [ Cr₂O₇²⁻] [ H₂O ] / [ Cr₂O₇²⁻ ]² [ H⁺]².
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Suppose a runner completes a 10K (10.0 km) road race in 45 minutes and 35 seconds.
What is the runner's average speed in miles per hour?
The average speed of the runner in miles per hour would be 8.18 miles per hour.
What is the average speed?The average speed of a moving object is the ratio of the total distance traveled by the object and the total time taken to cover the distance. Mathematically, this can be expressed as;
Average speed = total distance traveled/ total time taken
In this case;
Total distance = 10 km
Total time = 45 minutes, 35 seconds
In order to find the average speed in miles per hour, let's convert the distance from km to mile and the time to hour.
1 km = 0.621371 mile
10 km = 10 x 0.621371
= 6.21371 miles
1 hour = 3600 seconds
60 seconds = 1 minute
45 minutes = 45 x 60
= 2700 seconds
Total time = 2700 + 35
= 2735 seconds
3600 seconds = 1 hr
2735 seconds = 2735/3600
= 0.7597 hour
The average speed of the runner in miles per hour:
6.21371/0.7597 = 8.18 miles per hour
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Select all of the following amino acids that will create salt-bridges.
Serine
Aspartate
Histidine
Valine
Among the given amino acids, serine, aspartate and histidine can create protein salt bridges.
How amino acids take part in salt-bridge formation?Two non-covalent interactions—hydrogen bonding and ionic bonding—combine to form a salt bridge. One of the most significant noncovalent forces in chemistry and in biological systems is ion pairing. In a normal acid-base neutralization process, amino acids interact with one another to create salt. Simple attraction between the positive and negative charges and the shift of the -H (positive ion) from the acid to the amine constitute the reaction.
Amino acids that take part in bridge formation are- The anionic carboxylate (RCOO) of either aspartate or glutamate and the cationic ammonium (RNH3+) from lysine or the guanidinium (RNHC(NH2)2+) of arginine most frequently form the salt bridge. Although these are the most frequent, depending on external variables, additional residues with ionizable side chains like histidine, tyrosine, and serine can also take part in salt bridge formation.
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Serine, aspartate, and histidine can build protein salt bridges among the other amino acids mentioned.
How do amino acids contribute to the creation of salt bridges?
A salt bridge is created when two non-covalent interactions—hydrogen bonding and ionic bonding—combine. Ion pairing is one of the most important noncovalent forces in chemistry and in biological systems. Amino acids interact with one another to produce salt during a typical acid-base neutralization process. The reaction is simply the shifting of the -H (positive ion) from the acid to the amine and the attraction of the positive and negative charges.
The anionic carboxylate (RCOO) of either aspartate or glutamate, the cationic ammonium (RNH3+) from lysine, or the guanidinium (RNHC(NH2)2+) from arginine, are the amino acids that participate in bridge building. Although these are the most frequent, salt bridge creation can also involve other residues with ionizable side chains such histidine, tyrosine, and serine depending on the environmental factors.
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For the following reaction, 20.4 grams of sulfur dioxide are allowed to react with 9.97 grams of oxygen gas .
sulfur dioxide ( g ) + oxygen ( g ) sulfur trioxide ( g )
What is the maximum amount of sulfur trioxide that can be formed?
What is the FORMULA for the limiting reagent?
What amount of the excess reagent remains after the reaction is complete?
Answer:
1.3
Explanation:
18) Jamal performs an experiment where he mixes hydrochloric acid and zinc metal together. He writes a chemical equation that he thinks models his experiment.
2HCl(aq) + Zn(s) - ZnCl₂(aq) + H₂(g)
A) Heat was absorbed
B) A precipitate formed.
The color changed.
D) A gas was formed.
Answer:
the answer is D.
Pretest: Unit 2
Question 15 of 34
Which of the following increases the H* concentration in solution?
A. Water
B. A base
C. An acid
O D. Salt
SUBMIT
Which of these processes is a chemical change?
Answer:
Detailed Solution. The correct answer is Photosynthesis in plants. A chemical change takes place when a substance undergoes a chemical change i.e its molecular composition is changed entirely. It involves the formation of new substances and it is a permanent change.Reasoning About Photographing an Eclipse
Reasoning About Photographing an Eclipse
With your group, use the Reasoning Tool to connect each piece of evidence to the claim you think is correct.
Question: When can a lunar eclipse be photographed?
Claim 1: A lunar eclipse can be photographed anytime Earth is in between the sun and the Moon.
Claim 2: A lunar eclipse can be photographed sometimes when Earth is in between the sun and the Moon.
Evidence
This matters because . .
Therefore, . . .
(claim)
Example evidence: two Top View images
A lunar eclipse can be photographed sometimes when Earth is in between the sun and the Moon.
Evidence source: “An Ancient Machine for Predicting Eclipses” article
A lunar eclipse can be photographed sometimes when Earth is in between the sun and the Moon.
Evidence source: Earth, Moon, and Sun Sim
A lunar eclipse can be photographed sometimes when Earth is in between the sun and the Moon.
Evidence source: Moon Sphere Model
A lunar eclipse can be photographed sometimes when Earth is in between the sun and the Moon.
Therefore, the correct claim is: A lunar eclipse can be photographed sometimes when Earth is in between the sun and the Moon.
What is a Lunar Eclipse?A lunar eclipse occurs when Earth is positioned between the sun and the Moon, blocking the sun's light from reaching the Moon and casting a shadow on it.
However, not every lunar eclipse is visible and can be photographed. The visibility of a lunar eclipse depends on several factors such as the position of the moon in its orbit, the location of the observer on Earth, and the weather conditions.
Hence, the claim "A lunar eclipse can be photographed sometimes when Earth is in between the sun and the Moon" is supported by the evidence provided and is therefore correct.
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