It is more effective to perform an extraction with several small portions of solvent as opposed to one large portion of solvent of equal volume because the amount of the material left in the trash will be less.
The extraction of certain ratio of the solute is able to the distribute among the phases during each extraction. The various extractions with the lesser amounts of the solvent are more efficient than the single extraction with the huge amount of solvent.
The extraction is about to maximize the outside field of the communication between the two solvents, we can easily get the more surface area in the contact with the fewer amounts.
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1. How many atoms of oxygen are present in 0. 04 mole NaNO3?
2. How many moles of nitrogen atoms are present in 10. 5g of N2O5?
3. How many atoms of oxygen are present in 50g of Fe(H20)2(S04)3? Please answer fast
0.12 atoms of oxygen are present in 0. 04 mole NaNO3, 2. 0.097 moles of nitrogen atoms are present in 10. 5g of N2O5, 3. 0.127 atoms of oxygen are present in 50g of Fe(H20)2(S04)3
To find the number of atoms of oxygen present in 0.04 mole NaNO3, you can use the mole ratio from the chemical formula. The formula for NaNO3 is NaNO3, which means that for every 1 mole of NaNO3, there are 3 moles of oxygen atoms. Therefore, 0.04 mole of NaNO3 contains 0.04 mole x 3 atoms/mole = 0.12 atoms of oxygen.
To find the number of moles of nitrogen atoms present in 10.5 g of N2O5, you can use the molar mass and the molar ratio from the chemical formula. The molar mass of N2O5 is 108 g/mol, and the formula for N2O5 is N2O5, which means that for every 1 mole of N2O5, there are 2 moles of nitrogen atoms. Therefore, 10.5 g of N2O5 contains 10.5 g / 108 g/mol = 0.097 moles of nitrogen atoms.
To find the number of atoms of oxygen present in 50 g of Fe(H2O)2(SO4)3, you can use the molar mass and the molar ratio from the chemical formula. The molar mass of Fe(H2O)2(SO4)3 is 392.18 g/mol, and the formula for Fe(H2O)2(SO4)3 is Fe2(SO4)3.6H2O, which means that for every 1 mole of Fe(H2O)2(SO4)3, there are 6 moles of oxygen atoms. Therefore, 50 g of Fe(H2O)2(SO4)3 contains 50 g / 392.18 g/mol = 0.127 moles of oxygen atoms
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to make up 1 l of a 0.5 m solution of edta starting with the free acid, approximately how much 10 m naoh will have to be added to adjust the ph to 7.0? do you expect this solution to have a ph-buffering capacity? the pkas of the four acetic acid groups on edta are 2.0, 2.67, 6.16 and 10.26.
To make up 1 L of a 0.5 M solution of EDTA starting with the free acid, the pH must be adjusted to 7.0. EDTA is a weak acid with a pKa of 2.0, 2.67, 6.16, and 10.26 for the four acetic acid groups.
At a pH of 7.0, EDTA will exist in a buffered state, meaning that it will be partially protonated and partially deprotonated.
To adjust the pH of the EDTA solution to 7.0, an alkali solution such as 10 M NaOH must be added. The amount of NaOH required can be calculated using the Henderson-Hasselbalch equation:
pH = pK a + log([base]/[acid])
where [base] is the concentration of the deprotonated form of EDTA and [acid] is the concentration of the protonated form of EDTA.
At a pH of 7.0, the acid-base equilibrium of EDTA will be:
[EDTA-] = [HEDTA]
At this pH, the buffer capacity is high. Since the pKa of EDTA is close to the desired pH, the buffer will resist changes in pH caused by added acids or bases.
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Gather data: experiment with a variety of initial partial pressure of no, no2, and n2o3. For each set of initial partial pressures, use the gizmo to determine the equilibrium partial pressures of each gas. Run three trials for each set of initial conditions. Use the data you collect to fill in the first four columns of the table. (note that some no2 molecules combine to form n2o4, so there may be less free no2 than no) I don’t quite understand what it’s asking, so some clarification would be nice
The task is asking you to conduct experiments to determine the equilibrium concentrations of the gases NO, NO2, and N2O3 .
Specifically, you are to vary the initial partial pressures (or concentrations) of the gases and use a gizmo (presumably some sort of laboratory instrument) to measure the equilibrium partial pressures of each gas. You should conduct three trials for each set of initial conditions and record the data in a table with four columns: the initial partial pressures of NO, NO2, and N2O3 and the equilibrium partial pressures of NO, NO2, and N2O3. It is important to note that some NO2 molecules may combine to form N2O4, so there may be less free NO2 than NO at equilibrium. This experiment is designed to study the equilibrium of the reaction: 2NO(g) + 2NO2(g) <-> 2N2O4(g); The task is asking you to study the effect of the initial concentrations of each reactant on the equilibrium concentrations of each product. The data you collect should be useful in understanding the reaction kinetics and the thermodynamics of the system.
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The table below shows the time and distance of a moving car. What is the average speed of the car for the 10 minutes, expressed in meters per minute? In kilometers per hour? if u can pls put an explanation bc my teacher is rlly strict on that
The average speed of the car would be:
512 meters per minute30.12 km/hWhat 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 traveled.
The average speed can be mathematically expressed as:
Average speed = total distance/total time
From the graph, the total distance traveled by the car can be estimated as:
4800 + 320 = 5120 m
Total time = 10 minutes
Average speed of the car = 5120/10 = 512 meters per minute
5120 meters = 5120/1000 = 5.12 kilometers
10 minutes = 10/60 = 0.17 hour
Average speed of the car in kilometers per hour = 5.12/0.17 = 30.12 km/h
In other words, the average speed of the moving car in meters per minute is 512, while the speed in kilometers per hour is 30.12.
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30 grams of MgCl2 contains how many moles?
Answer:
Only, 0.315.
Full number: 0.31508964300342
Carbohydrates like sugars and starches are made of only three elements: carbon (C), hydrogen (H), and oxygen (O). How is it possible that so many different carbohydrates can be formed using only these three elements?
These elements are the least reactive in their family.
Different protons let these elements bond in a number of different ways.
Different combinations of the three elements result in different compounds.
These elements form long chains that keep growing, so the identity of each compound is always changing
Carbohydrates like sugars and starches are made of only these three elements (C,H,O) form long chains that keep growing, so the identity of each compound is always changing.
Carbon, hydrogen, and oxygen make up the biological molecules known as carbohydrates, with the ratio of one carbon atom (C) to one water molecule (H 2O) being about right. Because they are composed of carbon (carbo-) and water, carbohydrates have the term "carbohydrates" (-hydrate). The length of carbohydrate chains varies, and the three types of physiologically significant carbohydrates are monosaccharides, disaccharides, and polysaccharides. We will learn more about each type of carbohydrate in this article, as well as the vital energy and structural functions they provide in humans and other living things.
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A platinum bar measures 5. 0 cm long, 4. 0 cm wide,and 1. 5 cm thick. It has a mass of 700. 0 grams.
a) Calculate the volume of the platinum bar
b) Calculate the density of the platinum bar
volume of the platinum bar is 30 cm3, density of the platinum bar is 25g/cm3
It is assumed that,
750 g is the mass of a platinum bar.
L = 5 cm is the bar's length.
The width of the bar is 4 cm.
Bar width, 1.5 cm in height
V=l*b*h v=4*5*1.5=30cm3 is the volume of the bar.
The density of the platinum bar needs to be determined. Any substance's density can be calculated using:
The density of the platinum bar is 25g/cm3 and the volume of the platinum bar is 30 cm3.
So, the platinum bar's density. Therefore, this is the necessary solution.
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help pls:))!!!!!!!!!!
Answer: C
Explanation:
What is the name of this molecule?
Answer:
D). 2-Butyne
Explanation:
The "yne" indicates a triple bond. The "2-" says it starts on the second carbon,
0. 125L of a 0. 075 M HBr solution is used to neutralize 0. 0350L of an unknown Sn(OH)2
solution. What is the molarity of the unknown Sn(OH)2 solution?
please help
To neutralize 0.0350L of an unidentified Sn(OH)2 solution, 0.125L of a 0.075 M HBr solution is utilized. The molarity of the unknown Sn(OH)2 solution is 0.268 M.
The neutralization reaction between HBr and Sn(OH)2 is as follows:
HBr + Sn(OH)2 ---> SnBr2 + 2H2O
We can use the balanced equation and the stoichiometry of the reaction to find the molarity of the unknown Sn(OH)2 solution.
From the balanced equation, we can see that for every 1 mole of HBr, 1 mole of Sn(OH)2 is consumed.
We know that the HBr solution is 0.125L and 0.075M, so the number of moles of HBr is 0.125L x 0.075M = 0.00937 moles.
Since the number of moles of HBr is equal to the number of moles of Sn(OH)2, we can use the same number of moles to find the molarity of the unknown Sn(OH)2 solution.
The quantity of solute molecules per liter of solution is known as a solution's molarity. Therefore,
Molarity of unknown Sn(OH)2 solution = moles of solute / liters of solution
Molarity = 0.00937moles / 0.0350L = 0.268 M
Therefore, the molarity of the unknown Sn(OH)2 solution is 0.268 M.
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calcium reacts with sulfur forming calcium sulfide. what is the theoretical yield (g) of cas(s) that could be prepared from 7.72 g of ca(s) and 2.04 g of sulfur(s)?
Theoretically, 7.72 g containing ca(s) as well as 2.04 g of even more sulfur may be combined to produce 2.88 g of cas(s) (s).
Describe sulfur.Among the most rectifiers is sulfur (S), sometimes spelt as sulfur, a nonmetallic chemical element in the oxygenation member (Group 16 [VIa] of the atomic numbers). Natural sulfur is a pale yellow substance that is brittle, flavorless, and odorless.
Where can you find sulfur?Sulfur can be found naturally and now in metal bauxite ore. Natively, it can be found close to hot springs and volcanoes. The tenth most prevalent element, selenium is found in asteroids, the ocean, the crust of the earth, and the atmosphere.
balanced equation,
Ca + S ---> CaS
stoichiometry of Ca to S is 1:1
= Ca moles - 1.6 g/ 40 g/mol
= 0.04 mol
= S moles - 4.25 g / 32 g/mol
= 0.13 mol
stoichiometry of Ca to CaS is 1:1,
= CaS moles formed - 0.04 mol
= mass of CaS - 0.04 mol x 72 g/mol
theoretical yield = 2.88 g
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Research the dangers of aerosol cans and pressure cookers and write a report about those dangers. The report should be at least 200 words.
Note that Aerosol cans can explode if punctured or exposed to heat. Pressure cookers can malfunction and release steam & hot liquids if not properly maintained. Always use safety precautions and supervise children around these items.
What is the rationale for the above response?Aerosol cans and pressure cookers are both ubiquitous household devices that, if not used properly, can be deadly.
Pressurized gas in aerosol cans forces the product out of the can. An aerosol can can explode if it is pierced or exposed to heat, inflicting significant harm or even death. It is critical to keep aerosol cans away from heat sources at all times and to never puncture or burn them.
Pressure cookers cook food faster by trapping steam within the pot to produce high pressure and high temperatures. However, if the pressure cooker is not correctly maintained or operated, it might malfunction and cause burns or scalds by releasing steam and boiling liquids.
It is critical to be aware of the possible risks of these goods and to use them with caution. Keep them away from heat sources and in excellent functioning order at all times. If you're not sure how to use them securely, seek assistance from an adult. It is also critical to watch youngsters while they are in the vicinity of aerosol cans or pressure cookers to protect their safety.
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Do you feel that Paul Feyerabend’s belief falls more into a modernism or postmodernism method of thinking?
Yes Paul feyerabend falls more under postmodernism rather than modernism.
Paul feyerabend is considered a postmodernist philosopher of science. He is known for his critiques of the scientific method and the idea that there is a single "correct" way to do science. He argued that science is not a rational or objective enterprise, but is instead shaped by social and cultural factors. Feyerabend's views align more with postmodernism, which emphasizes the importance of context and subjectivity in understanding knowledge and reality.
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How many moles of CO2 are produced when 3.9 moles of C2H2 burn in oxygen?
The 50 moles of CO2 are produced when 3.9 moles of C2H2 burn in oxygen.
What is moles?
One mole is defined as the quantity of substance that has the same number of chemical species (atoms, molecules, ions, etc.) as those contained in 12 grams of the carbon-12 isotope.
What is oxygen?
Because oxygen contains only one type of atom, it is a chemical element, which is a type of substance. Since oxygen has an atomic number of 8, it is represented by the letter O in its formal chemical formula and has eight protons in its nucleus. In nature, molecular oxygen can be discovered.
2C2H2(g) + 5O2(g) ==> 4CO2(g) + 2H2O(g)
Next, look at the stoichiometric ratio of C2H2 to CO2. You can see it is 2 moles C2H2 produces 4 moles CO2.
Thus, 25.0 moles C2H2 x 4 moles CO2/2 moles C2H4 = 50.0 moles CO2
Therefore, 50 moles of CO2 are produced when 3.9 moles of C2H2 burn in oxygen.
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HELP PLEASE BOND ENTHALPY WORKSHEET
Bond energy is explained as the energy needed to destroy a bond/link. These values are positive, indicating that bond scission is endothermic.
What is bond energy?Bond energies are typically based on average bond dissociation values for species in the gas phase at a temperature of 298 Kelvin. Bond energy can be determined by measuring and calculating the enthalpy change as the molecule breaks down into atoms and ions and dividing that value by the number of chemical bonds. For example, the enthalpy change in splitting methane (CH4) into one carbon atom and four hydrogen ions divided by the four bonds (number of C-H) gives the bond energy.Bond energy is not always the same as bond separation energy. The bond energy value is the average of the bond dissociation energies within the molecule. Different amounts of energy are required to break subsequent bonds.To learn more about Bond energy from the given link:
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Explain how human activity can affect the carbon cycle.
I
Answer:
Humans use many fossil fuels such as oil and coal which in turn releases much carbon into the atmosphere. And burning of the forests also releases much carbon as well. This carbon in the atmosphere does many negative changes to the earth such as causing ocean acidification and overall hurting the planet's ecosystems.
Oxidation-Reduction and balancing through ion electron method. Answer choices on bottom. Can someone explain this problem how they got their answer? I having a hard time understanding oxidation and reduction reactions
The balanced equation of the redox reaction using the ion-electron method is:
3 Hg + 8 HNO₃ → 3 Hg(NO₃)₂ + 2 NO + 4 H₂OThe correct option is D.
What is a redox reaction?Redox reactions include a change in the oxidation state of the substrate. When oxidation occurs, electrons are lost, or the oxidation state increases. When a reduction occurs, electrons are gained or the oxidation state decreases.
The balanced equation of the redox reaction using the ion-electron method is given below as follows:
Hg + HNO₃ → Hg(NO₃)₂ + NO + H₂O
Hg⁰ is oxidized to Hg²⁺ by the loss of two electrons
N⁵⁺ is reduced to N²⁺ by a gain of three electrons
To balance electron loss, we add a coefficient of 3 in from of Hg and a coefficient of 8 in front of HNO₃
3 Hg + 8 HNO₃ → 3 Hg(NO₃)₂ + 2 NO + 4 H₂O
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two ways can scientists exhibit ethical behavior?
Answer:
Creating products that improve people's lives.
Remaining impartial about the data while conducting experiments.
Explanation:
a mixture contains 0.250 mol of fe and 1.20g of c. what is the total number of atoms in the mixture?
If a mixture contains 0.250 mol of fe and 1.20g of c. the total number of atoms in the mixture is: 2.106× 10^23.
How to find the Total number of atoms ?First step is to convert it into number of atoms
Atoms of Fe = 0.250 mol × 6.02 × 10^23 /1 mol
Atoms of Fe = 1.505 ×10^23
1.20g of C to atoms of C
Molar mass of C =12.011g/mol
Atom of C = 1.20g × 1 mol/12.011g × 6.02 × 10^23 /1 mol
Atom of C = 6.014× 10^22
Now let find the total number of atoms
Total number of atoms = Atoms of Fe + Atoms of C
Total number of atoms = 1.505 ×10^23 + 6.014× 10^22
Total number of atoms = 2.106× 10^23
Therefore the Total number of atoms is 2.106× 10^23
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you will be rewarded with the necessary items to make your S'morel
If we were to add a piece of solid Cu to an aqueous solution of silver
nitrate, the Silver would be replaced in a single replacement reaction
forming aqueous copper (I) nitrate and solid silver. How much silver is
produced is 15.00 gramps of Cu is added to the solution of excess silver
nitrate? Show al work and don't forget to use significant figures.
50.9 grams of Cu are added to the excess silver nitrate solution.
What is molar mass?The molar mass of a chemical compound is defined in chemistry as the ratio between the mass and amount of substance in any sample of said compound. The molar mass of a substance is a bulk property, not a molecular property. A substance's molar mass is the mass in grams of one mole of the compound. A mole is the number of entities present in a substance, such as atoms, molecules, or ions. A mole of any substance is defined as 6.022*10^23 molecules.
Here,
moles = mass÷ molar mass
molar mass of Cu = 63.5 g/mol
moles = 15.00 g÷ 63.5 g/mol
= 0.236 moles
moles of Ag =0.236
moles x 2/1 =0.472 moles
mass = moles x molar mass
the molar mass of Ag =107.87 g/mol
mass = 0.472 moles x 107.87 g/mol = 50.9 g
50.9 grams of Cu is added to the solution of excess silver nitrate.
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Would a separation of the types described above cause
change? Explain your answer.
chemical change or a physical
In a physical change, the substance's shape or appearance changes, but the type of matter it contains stays the same. But when matter undergoes a chemical change, at least one new substance with novel properties is created.
What is a chemical change?Chemical synthesis, or, alternatively, chemical decomposition into two or more different substances, occurs when one substance reacts with another to create a new substance.
Physical modifications are those that affect a chemical substance's form but not its chemical composition. Physical changes are usually unable to separate compounds into chemical elements or simpler compounds, but they can be used to separate mixtures into their component compounds.
An overview was given as your information is incomplete.
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What is the speed of a car that travels 1000 m in 45 seconds?
Answer:
80,000km/h
Explanation:
Answer: 12.5 hope this is right.
Explanation:
___Cr3+ + ___O2 ----> ___Cr2O3
Answer:
Explanation:
2 Cr3+ + 3/2 O2 -----> Cr2O3
which aqueous solution will have the highest melting point? assume all of the solute are nonvolatile and have ideal van't hoff factors.
The highest melting point is 0.100 m AlCl₃
Water has a 0.51 Cl molal melting point elevation constant.
They all share the same molal melting point elevation constant because they are all aqueous solutions.
0.100 M C₆H₁₂O₆ΔT = i*Kb*m
The melting point elevation is ΔT,
i = the van't Hoff factor =1,
The molal elevation constant of water's melting point is 0.51°C/m.
"where m = the molality = 0.100 m"
ΔT = i*Kb*m
ΔT = 1 * 0.51 * 0.100
ΔT = 0.051 °C
0.100 m NaClΔT = i*Kb*m
ΔT =2 * 0.51 * 0.100
ΔT = 0.102 °C
0.100 m AlCl3ΔT = i*Kb*m
ΔT =4 * 0.51 * 0.100
ΔT = 0.204 °C
0.100 m MgCl2ΔT = i*Kb*m
ΔT =3 * 0.51 * 0.100
ΔT = 0.153 °C
Your question is incomplete but most probably your full question was
which aqueous solution will have the highest melting point? assume all of the solute are nonvolatile and have ideal van't hoff factors. 0.100 m C₆H₁₂O₆ 0.100 m NaCl 0.100 m AlCl₃0.100 m MgCl₂
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Which term describes the molecule shown below?
Answer:
C
Explanation:
because i checked it in the periodic table solve it and that's it
It is very hot during the summer, so you want to go to your local pool. The meteorologist explains that the UV index for the day is extremely high. What does the UV index represent?
A. The UV index represents the wavelength of the ultraviolet rays
B. The UV index represents the speed of the light ultraviolet rays
C. The UV index represents the intensity of the ultraviolet rays
D. The UV index represents the color of the ultraviolet rays.
The correct option is (C), i.e. C. The UV index represents the intensity of the ultraviolet rays.
The UV index serves as a gauge for the UV radiation intensity from the sun. It is a scale that ranges from 0 to 11+ and it is used to indicate the level of solar UV radiation on a particular day. The higher the UV index, the stronger the sun's UV radiation and the greater the risk of sunburn and other harmful effects on the skin and eyes. It is important to pay attention to UV index when spending time outdoors, especially during summer months and at high altitude or closer to the equator where the sun is stronger.
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if a piece of metal has a volume of 0.00670 l and a mass of 60.0 g, what is the density of the rock in g/ml?
If the piece of the metal has the volume of the 0.00670 L and the mass of the 60 g. The density of the rock is 8955.2 g/L.
The mass of the metal = 60 g
The volume of the metal = 0.00670 L
The density is the ration the mass to the volume of the substances .
The density expression is given as :
The Density = mass / volume
Where,
The mass = 60 g
The volume = 0.00670 L
The density = 60 / 0.00670
The density = 8955.2 g/L
Thus the density of the rock is the 8955.2 g/L.
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krypton has a higher melting point than argon because of its group of answer choices ionic bonds. greater ionization energy. stronger dispersion forces. permanent dipole moment. hydrogen bonding.
Krypton has higher melting pointthen argon because of its stronger dispersion forces for iasondue to increase in atomic mass inter atomic attraction in these elements is only due to wekdispersion interactions. Answer for this problem is stronger dispersion forces.
The London dispersion force can be defined as a temporary attractive force due to the formation of a temporary dipole in nonpolar molecules. When the electrons of two adjacent atoms move so that the atoms momentarily become dipoles, they are attracted to each other by the London dispersion force.
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400.0 ml of a 0.300 m solution of nacl is diluted to 900.0 ml. what is the new concentration of the solution?
400.0 ml of a 0.300 m solution of NaCl is diluted to 900.0 ml. The new concentration of the solution is 0.133 M.
Given that :
The initial concentration, C1 = 0.300 M
The initial volume, V1 = 400 mL
The final volume, V2 = 900 mL
The final concentration , C2 = ?
The final concentration can be calculated as :
C1 V1 = C2 V2
C2 = C1 V1 / V2
C2 = ( 0.300 × 400 ) / 900
C2 = 0.133 M
Thus, the concentration of the new volume with the volume of 900 mL is 0.133 M.
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Based on her survey which advertising mediums will work best publicize Leslie’s in the store specials
The correct answer is printed flyers and internet .
Printed flyers and internet are two popular advertising mediums used to promote businesses. Printed flyers can be distributed directly to customers through mail or handed out in public places. This allows for a targeted approach and can be cost-effective, especially if the business is located in a small area. However, printed flyers can easily get lost or discarded, making it difficult to measure their effectiveness.
On the other hand, the internet offers a wider reach and can target a larger audience. Advertisements can be placed on websites, social media platforms, and search engines. This allows for more precise targeting based on demographics and interests. The internet also offers the ability to track and analyze the success of advertising campaigns in real-time, allowing for quick adjustments to be made to improve their effectiveness. However, the cost of internet advertising can be higher than traditional print advertising, and it may require more technical knowledge and resources to create and manage an online advertising campaign.
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Leslie wants to know which advertising medium works best to promote her electronics store. She surveys her customers over a weekend and creates a bar graph. Based on her survey, which advertising mediums will work best to publicize Leslie’s in-store specials?