These two samples of sodium chloride as provided in the question are in accordance with the law of definite proportion.
CalculationAccording to law of definite proportions, any provided chemical compound always contains its initial component elements in a fixed ratio, and it does not depend on its source and method of preparation.
So here in the first sample, we have
Mass of sodium = 8 g
n(Na) = 8/23
=0.347 mol
Mass of chlorine = 12.3g
n(Cl2) = 12.3/70.9
=0.173 mol
Thus, definite proportion = 0.173/0.347 ≈ 1:2
Then in the second sample,
Mass of sodium = 11g
n(Na) = 11/23
=0.478 mol
Mass of Chlorine =17.1g
n(Cl2) = 17.1/70.9
=0.241
Thus, definite proportion = 0.241/0.478 ≈ 1:2
Therefore, we see that in both of the samples, the proportion remains the same. Thus, both the samples follow the Law of definite proportion.
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Although the phospholipid molecules can be in constant lateral movement, they very rarely flip from one side of the bilayer to the other. Which of the answer choices could explain this?.
Although the phospholipid molecules can be in constant lateral movement, they very rarely flip from one side of the bilayer to the other.Therefore the head groups are repelled by the hydrophobic membrane interior.
Even though they sometimes move laterally constantly. The hydrophilic heads of the lipid bilayer membrane, which may contain some polar or water-soluble molecules, face both the cytosol and the external environment, while the hydrophobic tails of both layers, which are completely insoluble in water, face one another, forming a core that discourages mixing. The possibility of molecules flipping is extremely unusual.
The class of lipids known as phospholipids is notable for containing phosphorus-containing compounds and having a significant function in living cells. Due to their amphiphilic properties, they are creating lipid bilayers.
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The complete question is ''Refer to Animation: Fluid Mosaic Model. Although the phospholipid molecules can be in constant lateral movement, they very rarely flip from one side of the bilayer to the other. Which of the following could explain this?A. The head groups are too large to fit between the interior fatty acid tails. B. The cholesterol keeps the phospholipids on the correct side. C. The molecular attraction between the fatty acid tails is too strong. D. The head groups are repelled by the hydrophobic membrane interior''.
A 5. 0 l flask containing o2 at 2. 00 atm is connected to a 3. 0 l flask containing h2 at 4. 00 atm and the gases are allowed to mix. What is the mole fraction of h2? report your answer to two decimal places.
The mole fraction of H₂ = 0.55
What exactly is a mole fraction?A mole fraction is a concentration unit. The mole fraction, which is represented by "X," measures the relative amount of solute and solvent in the solution. The mole fraction is the number of moles of a specific component in the solution divided by the total number of moles in the given solution.A mole fraction is the proportion of molecules of a single component in a mixture. For example, if the mole fraction of methane in gas is 0.90, then 90% of the molecules are methane. Because the quantity fractions are similar to mole fractions, the mixture is also 90% methane.
Applying the ideal gas law
P V = n R T
=P V/R T
NO₂ = (2atm) (5L)/ RT
NH₂ = (4atm) (3L)/ RT
Assume the temperature of the two gases remains the same before and after the mixing occurs. The mole fraction of H₂ is
XH₂ = nH₂ /[tex]n_{total}[/tex] = nH₂ / nH₂+ nO₂
= [tex]\frac{\frac{(4atm)(3L)}{RT}}{\frac{(4atm)(3L)}{RT}+\frac{(2atm)(5L)}{RT}}[/tex]
= [tex]\frac{(4atm)(3L)}{(4atm)(3L)+ (2atm)(5L)}[/tex]
= 0.545455
The mole fraction of H₂ = 0.55
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How many molecules are in 2A1203? *
4 Molecules
6 Molecules
2 Molecules
5 Molecules
????
Answer:
6
Explanation:
2A is a molecule Argon bond. so, it's 1 + 2+ 3
What is the expression for water?
Answer:
H20
Explanation:
Answer:
H20
Explanation:
Two hydrogen and 1 oxygen
Pls mark as brainiest
Double covalent bonds are both shorter and stronger than single covalent bonds, but they also limit the geometry of the molecule because they ____________________.
Double covalent bonds are both shorter and stronger than single covalent bonds, but they also limit the geometry of the molecule because they create a new arrangement of electron shells.
Why do double covalent bonds outperform single ones?The energy needed to break a double covalent bond is 614 J, whereas the energy needed to break a single bond is 349 J.
Since a double bond requires more energy to break than a single bond does, it is stronger than a single bond. As opposed to single bonds, which can spin freely, double bonds are constrained in their rotation, making them stronger.
If compared to a single bond, is a double bond longer or stronger?In comparison to a single bond between the same two atoms or molecules, a double bond is both stronger and shorter. Even stronger and shorter is a triple bond.
A bond order of 1.5, such as that found in ozone, is stronger than a single bond but weaker than a double covalent bond.
How do double bonds impact the shape of molecules?There are two single bonds and one double bond in this molecule’s high electron density areas.
While the double bond results in somewhat bigger angles (121°), and the angle between the single bonds is slightly less (118°), the basic geometry is trigonal planar with 120° bond angles.
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Complete Question
Double covalent bonds are both shorter and stronger than single covalent bonds, but they also limit the geometry of the molecule because they ____________________.
(a) create a new arrangement of electron shells.
(b) change the reactivity of the bonded atoms.
(c) limit the rotation of the bonded atoms.
(d) prevent additional bonds from being formed with the bonded atoms.
Solution a is hypotonic with respect to solution b. What will happen when a cell from solution b is placed in solution a?.
When a cell from solution b is placed in solution a, water will enter inside the cell and it will swell up.
There are three kinds of solutions- isotonic, hypotonic, and hypertonic solutions.
When a solution has the same osmotic concentration as the cell, it is known as an isotonic solution. If a cell is placed in such a solution, water neither enters the cell nor exits from it and the cell remains the same in size.
When a solution’s osmotic concentration is more than a cell's, it is known as a hypertonic solution.
When a cell is placed in such a solution it loses water and shrinks.
When a solution’s osmotic concentration is less than a cell's, it is known as a hypotonic solution.
When a cell is placed in such a solution, water enters inside it and the cell swells up.
In the given situation, solution a is hypotonic with respect to solution b.
So, if a cell from solution b is placed in solution a, water will enter the cell and it will swell up.
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Atomic Structure worksheet!!
Atomic structure refers back to the structure of an atom comprising a nucleus (center) wherein the protons (undoubtedly charged) and neutrons neutral are gifted. The negatively charged particles called electrons revolve around the center of the nucleus.
10. The elements with the number of particles:-
a. 26 electrons and 26 protons are Iron Fe.
b. Iodine(I)
c. Helium (He)
d. Calcium (Ca)
e. Radon (Rn)
11. Yes/No
a. Yes
b. No
c. Yes,
d.Yes
12. Proton, neutral, negatively, electron
13. Proton and Neutron
14. Proton, Neutron, mass number.
15. a. Proton, neutron electron.
b. atomic number = 5
c. mass number = 11
16. 36 - 25 = 11 neutrons.
An atom is a particle of depending that uniquely defines a chemical element. An atom includes a principal nucleus which is surrounded by way of one or greater negatively charged electrons. The nucleus is undoubtedly charged and carries one or greater distinctly heavy particles called protons and neutrons.
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What steps did the experimenter take to make sure that the experiment was valid and accurate
Scientists utilize their knowledge of previous occurrences to establish a general principle or explanation that may be used to forecast future events.
Step 1: Collect data. These observations must be objective rather than subjective. In other words, the findings should be verifiable by other scientists. Subjective observations based on human ideas and beliefs do not belong in the world of science.
Step 2: Create a hypothesis. Our observations provide information about the past or the present. We want to be able to forecast future occurrences as scientists. As a result, we must employ our reasoning abilities.
A hypothesis is a name given to the general principle. Inductive reasoning is the sort of reasoning involved (deriving a generalization from specific details).
A hypothesis should include the following features:
• It should be a universal concept applicable across space and time.
• It should be a working hypothesis.
• It should be consistent with existing observations.
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Which chemical formula represents an organic molecule?
Responses
4H2O
4 uppercase H subscript 2 end subscript uppercase O
CCl2F2
uppercase C C lowercase l subscript 2 end subscript uppercase F subscript 2
Al2O3
uppercase A lowercase l subscript 2 end subscript uppercase O subscript 3
H2SO4
The chemical formula which represents an organic molecule is CCl₂F₂.
Organic compounds are those which have carbon atoms in them whereas inorganic compounds do not have carbon atom in it, but their are some exceptions.
Among the give responses,
4H₂O is an inorganic molecule, as there is no carbon in the molecular structure of H₂O. CCl₂F₂ is an organic compound which appears as gas. It contains carbon atoms in the chemical structure. It belongs to CFC compounds family. This organic molecule is formed by reaction of carbon tetrachloride with hydrogen fluoride gas in the presence of a catalyst, usually antimony pentafluorideCCl₄ + 2HF -----SbF₅-----> CCl₂F₂ + 2HCl
Al₂O₃ is an inorganic reagent. It does not have carbon atom. It is a covalent compound and not an ionic one.H₂SO₄ is an inorganic acid as it does not have carbon in it like other organic acids.To learn more about organic and inorganic,
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Which ONE of the following words is the ODD ONE OUT and WHY?
Mixture, Molecule, Compound, Element.
Needs to be 4 sentences at least lol
The odd one of the aforementioned substances is mixture because it is not a pure substance.
What are pure substances?A pure substance is a substance that has a fixed chemical composition. In chemistry, molecules, elements and compounds are all pure substances.
Molecules are pure substances and they contain one or more types of chemical elements i.e. two or more atoms held together by chemical bonds.
Compounds are substances formed by chemical bonding of two or more elements in definite proportions by mass.
Elements are the simplest chemical substances that cannot be decomposed in a chemical reaction or by any chemical means.
However, mixtures are substances made up of two or more substances that are not even in their chemical composition. Mixtures are impure substances.
Therefore, the odd one of the aforementioned substances is mixture because it is not a pure substance.
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A tin can has a density of 7.28 g/mL and a volume
of 300.1 mL. What is the mass of the tin can?
The mass of the tin can with a density of 7.28g/mL and volume of 300.1mL is 2184.73 grams.
What is the mass of the tin can?Density is simply referred to as mass of a unit volume of a material substance. It is expressed mathematically as;
p = m / v
Where m is mass and v is volume.
Given the data in the question;
Density of the tin can p = 7.28 g/mLVolume of the tin can v = 300.1mLMass of the tin can m = ?To determine the mass of the tin can, plug the given values into the into the above formula and solve for m.
p = m / v
7.28 g/mL = m / 300.1mL
Cross multiply
m = 300.1mL × 7.28 g/mL
m = 300.1 × 7.28 g
m = 2184.73 g
The mass of the tin can with a density of 7.28g/mL and volume of 300.1mL is 2184.73 grams.
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Eit
re
2. What new ideas do you have about the structure of the rock deep underground?
3. How could you use what you learned to explain why some mountains grow or move?
What new questions do you have now?
The structure of the rock deep underground determined by some theory by the scientists.
The majority of scientists think that rocks and minerals' constituent constituents are what cause layers to form. Rocks and minerals can "change state," or melt or crystallize to produce other rocks, at certain pressures and temperatures.Different kinds of rocks "reflect" both body waves in various ways. This enables seismologists to distinguish between various rocks that are found deep inside the Earth's crust and mantle. For instance, deep underground oil resources can be found using seismic reflections.The following reasons are how we can explain why some mountains grow:Because of mountain erosion, the crust loses mass, raising the mountains.The balance between the mountains' vast weight and their buoyancy in the mantle is one of the factors influencing the height of the range.The following reasons are how we can explain why some mountains move:A process known as small scale convection occurs when mantle material sinks at a plate boundary and then flows upward farther away, pushing on the crust. Mountains can be moved by the slow but unstoppable movements, both gradually and through earthquakes or eruptions.To learn more about growing mountains visit:
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Calculate the degrees of unsaturation in a compound with the molecular formula c3h6 and draw two possible structures, including hydrogen atoms, for the formula.
The degree of unsaturation is 1, and the possible structures are propene and cyclopropane.
Because the compound doesn't contain any heteroatoms, the matter of calculating degrees of saturation is simply deducting the number of hydrogen atoms (6) from the one a three-carbon alkane would have (8) and dividing by two:
(8 - 6) / 2 = 1
Because a single degree of unsaturation means either a double bond or a ring, we can draw an example of each, sticking to the three-carbon formula. This way we end up with propene (double bond) and cyclopropane (ring).
In addition, these are the only structures possible for this molecular formula.
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Which types of molecules will be in the in the beaker
after the reaction?
select one:
Answer:
H20 only
Explanation:
It's because that When a chemical forms, It turns into a product. The product can't just float away, but byproducts can.
HELP ME!!!! (1 point)
When Neils Bohr observed that unique wavelengths of light and color were released when different gases were exposed to electrical current, this led him to develop a new model of the atom that reflected what he had discovered about the location of the electrons in an atom. Which statement is most consistent with his proposed model of the atom based on these findings?
a. Electrons were able to move freely throughout the nucleus
b. Electrons were bound tightly inside the nucleus of the atom
c. Electrons were in orbits of both fixed size and energy
d. Electrons were scattered randomly throughout the atom
PERSONAL REQUEST (optional): When you place the answer please include an explanation that shows how the answer connects to the overall question. Thank you! :)
Electrons were in orbits of both fixed size and energy.
The main features of Niels Bohr's proposed atomic model are listed below.
In an atom, a positively charged nucleus is surrounded by negatively charged electrons. These electrons travel along distinct circular trajectories called orbits or shells.According to this atomic model, each of the circular routes, which have set energy levels, is referred to as an orbital shell.The integers n=1, 2, 3,... indicate the energy levels of electrons in various orbits and are referred to as quantum numbers. These numbers correspond to the shells K, L, M, and N for the integers 1, 2, and 3, respectively. Since it is nearest to the nucleus and has the lowest energy level of an electron (n=1), it is sometimes referred to as the ground state.An electron can go to a higher energy orbital shell by receiving energy (or photons), and it can move to a lower energy level or orbital shell by losing energy.To learn more about Niels Bohr's refer the link:
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□
5. Which of the following measurements have four significant figures? Select all that apply.
5,000 s
120.0 mL
0.0007 cm
1,001 g
Answer:
1001
Explanation:
Zeroes between non zero digits are significant
Answer:
1001 g and 120.0 mL
Explanation:
Zeros in-between natural numbers are significant
If your number has a decimal place, and you have zeroes after a natural number, then all the zeros are sig figs.
Ex: 10000.0 = 6 sig fig
Not: 0.00001 = 1 sig fig
Not: 0012.0 = 3 sig fig
How many grams are in 1.70 moles of Ca(NO3)2?
The number of grams in 1.70 moles of Ca(NO₃)₂ is 384.2 grams
How to determine the mass of Ca(NO₃)₂The mole of a substance is related to it's mass and molar mass according to the following equation:
Mole = mass / molar mass
With the above formula, we can determine the mass of Ca(NO₃)₂ as illustrated below:
Mole of Ca(NO₃)₂ = 1.70 molesMolar mass of Ca(NO₃)₂ = 40 + 3[14 + (16 × 3)] = 40 + 3[14 + 48] = 40 + 3(62) = 40 + 186 = 226 g/mol Mass of Ca(NO₃)₂ = ?Mole = mass / molar mass
1.70 = Mass of Ca(NO₃)₂ / 226
Cross multiply
Mass of Ca(NO₃)₂ = 1.70 × 226
Mass of Ca(NO₃)₂ = 384.2 grams
Thus, the mass of 1.70 moles of Ca(NO₃)₂ is 384.2 grams
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A sample of an element X is made up of 11% of the isotope X-17 and 89% of the isotope X-13.
Calculate the relative atomic mass, Ar, of element X.
The relative atomic mass, Ar, of element X is 1.43.
What is the relative atomic mass?The relative atomic mass can be calculated by multiplying the mass of the isotope by the total isotope's abundance x 100. It is the weight is grams of the number of atoms of the element.
Given, that isotopes X - 17 which is 11%
The isotopes X - 13 which is 89%
The relative atomic mass will be
Ar = ∑ isotopic mass × total isotope abundance 100.
Putting the values in the equation
11 / 100 x 13 / 100 x 100 = 1.43
Thus, the relative atomic mass, Ar, of element X is 1.43.
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select the correct answer. what is the si unit used to measure the temperature of a substance? a. degree celsius b. degree fahrenheit c. gram d. kelvin e. mole
The answer is Option (d) Kelvin.
The SI unit used to measure the temperature of a substance is Kelvin.
It is defined as per the International System of units and is denoted by the symbol K.
The temperature can also be measure in the various units such as degree Celsius and degree Fahrenheit but the standard unit is Kelvin.
The temperature "0 K" is considered as the absolute temperature.
The widely used temperature measuring unit is degree Celsius in which water freezes at 0° Celsius and it boils at 100° Celsius.
The interval gap of degree Celsius is equal to the interval gap of degree Kelvin, and the interval gap of 1 degree Celsius is 1.8° Fahrenheit .
Also the 0° Celsius is 273 Kelvin.
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Answer:
Kelvin
Explanation:
If it takes 3.5 hours for the Hogwarts Express, moving at a speed of 120 mi/hr, to make it from Platform 9 and 3/4 to Hogwarts, how far apart are they.
Answer:
I think 3.5 times 120mi
Explanation:
9 -3/4=
Sally and Juan's science teacher challenged her students to build a paper airplane that would stay airborne for ninety seconds. The students have two days to design and test their planes. The assignment will end with a "fly-off."
First, Sally and Juan researched plane designs. Then they built their first plane. Each time they tested the plane, it took a nose dive straight into the floor. They changed the design by reshaping the nose of the plane and adding some weight to the tail. The plane flew, but did not get very far. After a few tries, their plane stayed in the air an average of twenty-two seconds.
Predict the outcome of succeeding trials if Sally and Juan had changed their throwing technique.
Answer: Make it extra pointy and the paper must be strong secure, but not too heavy or else is wont fly.
Explanation: it will work if you follow these steps:... BELIEVE IN YOURSELF!!! :)
backpackers often use canisters of white gas to fuel a cooking stove's burner. if one canister contains 1.45 l of white gas, and the density of the gas is 0.710 g/cm3 , what is the mass of the fuel in kilograms?
The mass of fuel in kilograms is 1.03 kg.
How do you calculate the mass of fuel?To find the mass, divide the amount of energy required by the amount of energy released per gramme of fuel. The kilojoule units will cancel out, leaving us with grammes.A simple multiplication can be used to calculate the fuel mass flow rate from the fuel to air ratio. The engine air flow rate is normally determined by nozzle conditions. The fuel to air ratio value can be used to calculate the engine's specific fuel consumption.
Steps of the equation:
The density of the gas sample in the canister is 0.710 grams/cm³.
We will use the density to relate the given volume of the canister (1.45 L) to determine the mass in kilograms of the fuel contained in one canister. We need to convert first the given volume in liters to cm³.
1000cm3=1L
The calculation will be:
Volume = 1.45L(1000cm/31L)
Volume=1.45×10³cm³
We can now determine the mass of the fuel.
mass = (0.710grams/cm³) × (1.45×10³cm³)
mass = 1.03×10³grams
We can now convert the calculated mass in grams to kilograms.
mass=1.03×10³grams(1kg/1000grams)
mass =1.03kg
Conclusion:
The mass of fuel in kilograms is 1.03 kg.
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The km of an enzyme is 5. 0 mm. Calculate the substrate concentration when this enzyme operates at one‑quarter of its maximum rate.
1.67 mM is the substrate concentration when this enzyme operates at one‑quarter of its maximum rate.
It is given that the km of enzyme is 5.0 mM.
Enzyme is a protein based molecule that increase the rate of the given chemical reaction.
The conncetion in the middle of substrate and rate of reaction is calculated by the Michaelis-Menten Equation.
V = Vmax[S] / Km + [S]
where, V is initial velocity Km is measure of affinity and S is substrate concentration.
V = 0.25 [5.0] / 1/4 [5.0]
V =1.67
We apply one quarter in the given equation and the answer would be 1.67 mM
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28. The volume of a gas sample is 22 L at STP. The density of the gas is 1.35 g/L. What is the mass
of the gas sample, expressed to the correct number of significant figures?
1) 30. g
3) 16.7 g
2) 30.0 g
4) 2.56 g
Answer:
30
Explanation:
Density = mass over volume
1.35 = m ÷ 22
isolate m
1.35 × 22 = 29.7
2 sig figs
so,
30 grams
The mass of the given gas sample at STP is 28 grams.
What is the relation between the mass and density of a solid body?
The relation between the mass and density of any substance is given by -
M = ρV
Where -
M - mass of body
ρ - density of body
V - volume of body
Given is volume of a gas sample is 22 L at STP. The density of the gas is 1.35 g/L.
We can write -
Volume of gas = [V] = 22 L
density of gas = [D] = 1.3 g/L
Therefore, the mass of the gas will be -
M = ρV
M = 1.3 x 22
M = 28.6 g
Therefore, the mass of the given gas sample at STP is 28 grams.
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Choose of all the indicators of a chemical change. (A) Substance bends. (B) Chemical bonds are broken. (C) Unexpected change in temperature. (D) Odor change. (E) Producing a gas or fizzing. (F) Unexpected color change. (G) Chemical bonds are formed. (H) Precipitate (solid) formed. (I) Change is state of matter. (J) Substance dissolves into another.
Answer:
C,D,E,F,H,I,J are all basic observable indicators of chemical change
Explanation:
I’m giving brainlest pls help meeee
Answer: Bromine
Explanation:
Name some physical and chemical properties of hafnium.
Answer:
Physical Properties of Hafnium Hafnium is a shiny and silvery metal exhibiting ductile features. It is usually resistant to corrosion and exhibits similar chemical properties to that of zirconium.
Atomic Mass: 178.49 g.mol −
1Atomic Number: 72Symbol: Hf
2a. What is the difference between weight and mass?
When 10.16g of pentane is burned in a calorimeter, 9.87kg of water are heated from 21.6(degree) to 33.7(degrees) What would be the molar heat of reaction for carbon dioxide in the above reaction?
2,259.675kj/mol
10.16g of pentane is burned in a calorimeter, 9.87kg of water are heated from 21.6(degree) to 33.7(degrees), the molar heat of reaction for carbon dioxide will be
From the above statement , we have found
pentane C5H12 = 10.16g
H2O = 9.87kg
TI = 21.6°C T2 = 33.7°C
C5H12+8O2=5CO2+6H2O
as per the reaction, one mole of pentane gives 5 mole of carbon dioxide
now:
molar heat of CO2 = ncΔt ,
here n is number of mole, c is specific heat, t is temperature
Q = 5 ×37.35× 12.1
Q= 2,259.675kj/mol
The molar specific heat is the specific heat equivalent to one mole of a material. The quantity of a material, the temperature change, and the type of the substance all affect how much heat must be supplied to a substance to raise its temperature or removed from a substance to reduce it.To know more about molar specific heat visit : https://brainly.com/question/27181520
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Which statement best describes a scatterplot?
A. it shows data as a percentage of a whole
B. it shows data points connected by a single line
C. it shows quantitative data that relate two variables
D. it shows qualitative data grouped by similarities
According to the research, the correct option is C. A scatterplot identifies the problem and its variables showing quantitative data that relate two variables.
What is a scatterplot?It is a control and support tool that shows a geometric design that presents the existing links and the level of correlation between variables and how one variable influences another.
In this sense, given that it is a tool or graphic representation it is widely used in statistics, that helps to identify the possible association between two related sets of data, it seeks to correlate said variables in order to better control the process and improve it.
Therefore, we can conclude that according to the research, the correct option is C. A scatterplot identifies the problem and its variables showing quantitative data that relate two variables.
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