Answer: What does Resources that control the size a population can reach are known as? a limiting factor
Explanation: A limiting factor is anything that constrains a population's size and slows or stops it from growing. Some examples of limiting factors are biotic, like food, mates, and competition with other organisms for resources.
Which sample is more dense? How does the graph show you this?
An object that sinks in water is more dense than the one which floats on it. The slope on a graph can determine the density of these objects.
For an identical size object, a dense object weighs more than a less dense one. A substance that is less dense than water will float on it; a substance that is denser will sink. Density equals mass per unit volume, or D = M / V, is the density equation.
The density of a substance can be determined by dividing its mass by its volume. Mass is on the y-axis and volume is on the x-axis in a graph of mass against volume. By calculating the slope, which is the change in y divided by the change in x, you may use this sort of graph to compute density.
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After being discredited on the stand in the jackson case, what did gettler do? (poisoner's handbook video notes)
After losing credibility throughout the jackson case trial. To show that only the body is failing, Gettler underwent a number of cyanide tests.
He identified cyanide poisoning as the cause of death using chemical analyses.
What are the forensic test had been done by Gettler ?He examined techniques for identifying human body decomposition by wood alcohol.
He identified cyanide poisoning as the cause of death using chemical analyses.
When arsenic was utilized as a toxin, the Marsh test, a very sensitive method for finding arsenic, is particularly helpful in the field of forensic toxicology. James Marsh, a chemist, created it, and it was first printed in 1836.
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The elements in a_____ always combine in______ proportions
using the structure of oxazole, draw a mechanism to show protonation of the most basic site in the molecule using hcl as the proton source. draw the products of the proton transfer reaction, including all necessary lone pairs and nonzero formal charges.
A large class of heterocyclic aromatic organic compounds are descended from oxazole. These are azoles, which have one carbon between the oxygen and the nitrogen.
Although less aromatic than thiazoles, oxazole are nonetheless compounds. Since imidazole’s conjugate acid has a pKa of 7, oxazole’s conjugate acid has a pKa of 0.8.
What is the purpose of oxazole?In this study, the most recent research and discoveries on the full spectrum of oxazole compounds as pharmaceuticals—including those with antimicrobial, antifungal, antiviral, antitubercular, anticancer, anti-inflammatory and analgesic properties—were carefully examined.
Why does Oxazole make a poor base?Because nitrogen is more basic than oxygen, protonation occurs at the sp2 orbital of nitrogen in oxazole. Oxazole’s oxygen atom reduces the
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what are the concerns presented by overheating a distillation to a dry flask? select one or more: the remaining solid residue might contain explosive peroxides. the lack of liquid in the original flask might reverse the distillation process. the dry flask might become brittle and could easily be broken. the empty glassware might heat quickly, igniting vapors from the distillation.
The empty glassware might heat quickly, igniting vapors from the distillation is the concerns presented by overheating a distillation to a dry flask.
What happens if you overheat the distillation process?First and foremost, consider safety. If you heat an organic compound in an improperly vented closed-system distillation apparatus, it can build pressure and potentially burst. The resulting explosion can produce dangerous flying glass, hot, corrosive chemicals, and potentially hazardous fumes.A distillation should never be overheated to the point where all of the liquid has been extracted. There could be solid residue left over that contains hazardous compounds. Furthermore, without liquid, the glassware would heat up faster, potentially igniting the vapors still present in the setup.Due to superheating the solution, an overheated flask may cause bumping and give you an observed boiling point that is too high. You can adjust the rate of heating by piling up or scraping away some sand from the flask.To learn more about overheat the distillation refer to
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Two stable isotopes of copper have the following masses and percent abundances in nature:
Cu-63; Isotopic mass: 62.93 amu; % abundance: 69.09
Cu-65; Isotopic mass: ? amu; % abundance: 30.91
If copper has an atomic mass of 63.55 g/mole, what is the isotopic mass of Cu-65?
OPTIONS
64.01 amu
64.53 amu
64.93 amu
65.03 amu
MAKE SURE TO REALLY EXPLAIN IT! HOW DID U DETERMINE THIS? WHAT STRATEGY DID U USE? STEP BY STEP I WANT TO KNOW EVERYTHING!!
Answer:
the option will be no.3
Explanation:
why? because I said so
Atoms are made up of?
Answer:
Atoms are made up of a nucleus, protons and electrons
an azeotrope is a mixture that has the same composition in the liquid phase than the gas phase . therefore, an azeotropic mixture can be separated by distillation.
An azeotrope is a composition that has the similar components in the liquid phase as compared to the gas phase . therefore, an azeotropic compositions cannot be separated by distillation.
It is not separated by the distillation or fractional process due to the reason of the when the azeotrope mixture is boiled, the gaseous vapor has the similar proportions of constituents or the components as the unboiled mixture.
It can only be separated by azeotropic distillations. This method is also well known by the AD process.
It is a method to break the azeotropes with the help of various mixture of solvent , or separating agent it forms heterogeneous azeotropes.
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chegg write the empirical formula corresponding to each of the following molecular formulas: a) al2br6, b) c8h10, c) c4h8o2, d) p4o10, e) c6h4cl2, f) b3n3h6
To find the empirical formula from a molecular formula, you should divide the Subscripts by the Some integer in order to get the smallest whole number.
Part-A
The empirical formula of [tex]Al_{2}Br_{6}[/tex]is [tex]AlBr_{3}[/tex], we get it by dividing both subscript (i.e. 2&6) by 2.
Part-B
The empirical formula of C8H10 is
Simplest ratio of CH = 8:10 = 4:5
Hence, empirical formula =C4H5
Part-C
The empirical formula of C4H8O2 is C2H4O, we get it by diving all subscripts [tex]\frac{4}{2} : \frac{8}{2} :\frac{2}{2}=2:4:1[/tex] by 2.
Part- D
molecular formula= P4O10
simplest ratio of
[tex]\frac{P}{O}= \frac{2}{5} \\ empirical formula = p_{2}O_{5}[/tex]
Part -E
The empirical formula of C6H9CL2 is C3H2CL,we get it by diving all subscripts[tex]\frac{6}{2}:\frac{4}{2}:\frac{2}{1} =3:2:1[/tex] by 2
Part-F
The empirical formula of B3N3H6is BNH2, we get it by diving all subscripts [tex]\frac{3}{3} :\frac{3}{3} :\frac{6}{3} = 1:2:3[/tex] by 2.
what is molecular formulae? A molecular formula is a picture of a molecule that shows the different types of atoms in the molecule using chemical symbols, followed by subscripts to show how many of each type there are in total. Molecular formulae are also used as acronyms for such names of compounds (a subscript is only used if more than one atom of a certain kind is present).When two or more elements interact chemically, bonds are created, and substances called compounds are created. for example the reactions of sodium and chlorine may produce table salt while the reactions of hydrogen and oxygen can produce water. Sometimes, we use an empirical formula to define the atom kinds and simplest whole-number ratio of these compounds' atoms (or ions) to explain their structure.To know more about molecular formulae visit:
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Pls hurry and tell the answer.
Is it a, b, c, d
Answer:
D
Explanation:
I have a crush on the same and I
A gaseous hydrogen and compound containing is decomposed and found to contain 85.63% c and 14.37% h by mass. the mass of a 255ml of the gas, measured at stp, was found to be 0.646g
The molecular formula of the compound is [tex]C_{4} H_{8}[/tex]
We can calculate the empirical formula from the carbon and hydrogen percentage by assuming that we have 100 g of the substance:
carbon: 85.63 g / 12 g/mol = 7.1358 mol
hydrogen: 14.37 g / 1 g/mol = 14.37 mol
We divide the moles with the smallest amount to get a mole ratio:
7.1358 mol / 7.1358 mol = 1
14.37 mol / 7.1358 mol = 2.01
So the empirical formula is [tex]CH_{2}[/tex], with the molar mass of 12 + 2 * 1 = 14 g/mol.
We can calculate the molar mass of the compound using ideal gas laws. At STP, 1 mol of any gas has a volume of 22.4 L, so:
1 mol : 22.4 L = X : 0.255 L
X = 1 mol * 0.255 L / 22.4 L = 0.0114 mol
From this, we calculate the molar mass of the gas:
0.0114 mol : 0.646 g = 1 mol : X
X = 0.646 g * 1 mol / 0.0114 mol = 56.67 g/mol
To get the molecular formula, we divide the molar mass of the gas by the molar mass of the empirical formula:
56 g/mol / 14 g/mol = 4
So now we multiply the empirical formula by 4 to get the molecular formula:
[tex]C_{4} H_{8}[/tex]
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If you add a chunk of zinc to a beaker of acid and zinc shavings to another beaker of acid, the sample with the zinc shavings will react faster. What property causes the increase in rate?.
The property that causes the zinc shavings to react faster than the chunk of zinc is called the surface area.
The surface area is a crucial factor to consider while conducting any kind of chemical reaction because it considerably affects the reaction's rate. As surface area is reduced, response rates accelerate.
A chunk of zinc is like a body of stone kept together by strong bonding when contrasted to zinc shavings, which are zinc particles with lower surface areas.
The zinc shavings' reactive surface area is smaller than that of the enormous zinc chunk. Due to their reduced surface areas, reactants must be in close proximity to the acid solution for the reaction to take place.
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Identified triads of elements with similar properties: organized elements according to increasing atomic mass:
Element of first triads with similar properties are : calcium , strontium and barium are in increasing order of atomic mass.
A triad is a grouping of three elements organized according to increase in atomic mass.
Dobereiner stated his law of triad as : " airthmatic mean of atomic masses of first and third element would be equal to atomic mass of second element".
The first triad of dobereiner was introduced as : calcium , strontium and barium.
In this triad, the airthmatic mean of calcium and barium is exactly same as that of strontium.
therefore , according to this the properties of middle element lie in between first and third element.
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Answer:
Identified triads of elements with similar properties:
✔ Dobereiner
Organized elements according to increasing atomic mass:
✔ Mendeleev
Explanation:
Ed22
An unknown substance appears as a white powder
Answer:
How do you identify an unknown white powder?
Not only can Raman spectroscopy be used to identify unknown white powders rapidly, it can also be used to identify explosives (Figure 3) and other biochemical agents such as anthrax and mustard gas
Explanation:
Which solution has the same number of moles of hcl as 25.0 ml of 0.200 m solution of hcl?
12.5 mL of 0.400M solution of HCL has the same number of moles of HCL as 25.0 ml of 0.200m solution of HCL.
What is a mole?A unit of measurement for substance amount is the mole. We have a reliable way to translate between atoms/molecules and grams by moles. Molecules can be expressed in terms of volume, the number of atoms or molecules, and molecular mass. A pure material has a molecular mass in grams that are equivalent to 1 mole of that substance.
Multiplying the volume in L by the molarity in mol/L gives moles of HCL
25.0 mL(1L/1000 mL)(0.200mol HCL/1L)
=0.00500 mol HCL in the solution.
For each answer choice, perform the same calculation to identify the correct match.
12.5mL(1L/1000mL)(0.400 mol HCL/1L)
=0.00500 mol HCL
The correct answer is 12.5mL of 0.400M solution of HCL.
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How many moles of sodium nitride, nan3, are needed to produce 3.94 mol of nitrogen, n2?
Number of moles of sodium nitride, NaN₃ needed to produce 3.94 moles of Nitrogen, N₂ is 2.63 moles
Decomposition of sodium nitride is
NaN₃ → Na + N₂
On balancing the given reaction we need to add the necessary coefficients behind the reactants and products
2NaN₃ → 2Na + 3N₂
So, 2 moles of NaN₃ is needed to form = 3 moles of N₂
or 3 moles of N₂ is produced from = 2 moles of NaN₃
1 mole of N₂ is produced from = 2/3 moles of NaN₃
3.94 moles of N₂ of produced from = 3.94 x 2/3 moles of NaN₃
= 2.63 moles of NaN₃
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5 ways to prevent global warming
Answer:
Reduce emissions, make clean energy, stop pollution, drive electric vehicles, and reduce meat consumption
Explanation:
Answer:
1. Save energy at home (heating, electricity)
2. Try walking, biking or taking public transport instead of going in a car or own vehicle
3. Don't waste food
4. Eat more vegetables
5. Try to travel without going on an airplane
Practice writing in scientific passive voice by summarizing physical properties of the periodic table in your own words.
Your summarization should be at least three sentences long and refrain from using the first person.
The physical properties of elements in the periodic table varies as follows;
melting and boiling point of metallic elements increases across the period from left to to right and decreases down the group. Whereas, for non-metallic elements, the melting and boiling point decreases across the period from left to to right and increases down the groupatomic size of elements decrease across a period from left to right, but increases on going down the group.What is the periodic Table?The Periodic table is a table which arranges elements based on their increasing atomic number into vertical columns called groups and horizontal rows known as periods.
The physical properties of the periodic table refers to the properties in of the elements in the periodic table which vary in a regular pattern both down the groups and across the periods.
Some physical properties of the periodic table are as given below:
melting and boiling pointatomic sizeMelting and boiling point: the melting and boiling point of the metallic elements in the period table increases on going from left to to right across the period and decreases on going down the group. For non-metallic elements, the melting and boiling point decreases on going from left to to right across the period and increases on going down the group
Atomic size: the atomic size of the elements decrease across a period from left to right, but increases on going down the group.
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Diethyl ether has a vapor pressure of 400. 0 torr at 18°c. When a sample of benzoic acid is dissolved in ether, the vapor pressure of the solution is 342 torr. What is the mole fraction of benzoic acid in the solution?.
The mole fraction of benzoic acid in the solution is 0.855.
What is benzoic acid?
Benzoic acid is a white solid which is a carboxylic acid based on benzene.
The vapor pressure of the benzoic acid solution and the mole fraction of the solute are directly proportional to each other i.e.
Pt = x P°s
Here t = total pressure
s = solvent
Given:
Vapor pressure of diethyl ether = 400.0 torr
Vapor pressure of the solution = 342 torr
Now substituting the values in the formula
342 = x 400
= 342 / 400
= 0.855
Thus, the mole fraction of benzoic acid is 0.855
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Container "a" holds n2 gas with a mass of 69.8 g and is 4.9 times the volume of container "b" which holds argon (ar) gas at the exact same temperature and pressure. what is the mass of the ar (in g) within container "b"?
By ideal gas approximation, the mass of the Argon gas in container "b" is 488.6 grams.
We need to know about the ideal gas theory to solve this problem. The ideal gas is assumed that there is no interaction between particles in a gas. It can be determined by the equation
P . V = n . R . T
where P is pressure, V is volume, n is the number of moles gas, R is the ideal gas constant (8.31 J/mol.K) and T is temperature.
From the question above, we know that
Molar mass N₂ = Mr N₂ = 28
Molar mass Ar = Mr Ar = 40
m1 = 69.8 gr
V1 = 4.9 V2
P1 = P2 = P
T1 = T2 = T
Approximate that the gas is ideal, hence the ratio is
P1 . V1 / (n1 . R . T1) = P2 . V2 / (n2 . R . T2)
P . V1 / (m1/MrN₂ . R . T) = P . 4.9V1 / (m2/MrAr . R . T)
Mr N₂ / 69.8 = 4.9 . MrAr / m2
28 / 69.8 = 4.9 . 40 / m2
m2 = 488.6 grams
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How much water would be displaced if we submerged this book inside a tank of water? The book is 56cm3.
56 ml of water is displaced on submerging a book having volume of 56 cm³.
How to calculate volume of fluid displaced?If a body is considered which is completely submerged, the volume which it will displace will be equal to volume of the body.If it is partially submerged,volume of fluid displaced will be equal to the volume of the part which is submerged.This is in accordance with the Archimedes' principle.
The Archimedes' principle can be stated as the upward buoyant force which is exerted on a body irrespective whether the body is partially or fully submerged is equal to the weight of fluid which is displaced by it.
Thus,56 cm³ of water will be displaced on submerging the book into water as the book will be completely submerged.
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The table lists the half-life for four different isotopes of sulfur. Equal amounts of each sample are stored in sealed jars. Which jar will contain the least amount of the isotope of sulfur after 10 seconds?
Isotope Half-life
sulfur-30 1.18 seconds
sulfur-35 87.5 days
sulfur-37 5.05 minutes
sulfur-41 1.99 seconds
A.
sulfur-30
B.
sulfur-35
C.
sulfur-37
D.
sulfur-41
Jar containing sulfur-30 will have least amount of sulfur.
How does radioactivity varies with time?Radioactivity of a substance decreases with increase in time indicating that they are inversely proportional.Among the different isotopes of sulfur mentioned ,sulfur-35 is most radioactive as it has half-life period of 87.5 days.
On the other hand, sulfur-30 is least radioactive as it has half-life period of 1.18 seconds, thus within 10 seconds the jar containing sulfur-30 will be almost empty.
Therefore,the jar containing sulfur-30 will have least amount of sulfur after 10 seconds as it's half-life is least.
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Rob is in charge of waxing the floor at the local mall. He wants to test a new brand of floor wax called Squeaky Clean. Rob waxes 20 floor tiles with Squeaky Clean and 20 tiles with the original wax brand. After one week he counts the number of scratches on the floor
After one week he counts the number of scratches on the floor it is the independent variable.
An independent variable is one whose values are altered by the researcher to achieve the desired results.
The variable is known as the dependent variable when its values change in response to changes in the independent variable's values.
The dependent variable serves as the experiment measure while the independent variable controls the experiment.
The dependent variable is an effect of the independent variable, which is a cause.
In a linear regression, we can state that "y" stands for the dependent variable and "x" for the independent variable.
While the dependent indicates the influence of changes in the independent variable, the independent depends on nothing.
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(math involved!!) In the following reaction, how many molecules of HCl are needed to produce four molecules of H2O?
Four molecules of HCl are needed to produce four molecules of H₂O.
What is the number of molecules of of HCl needed to produce four molecules of H₂O?The number of molecules of of HCl needed to produce four molecules of H₂O is determined from the mole ratio of the reaction as given in the equation of the reaction below:
2 HCl (aq) + Ca(OH)₂ (aq) → CaCl₂ (aq) + 2 H₂O (l)
The mole ratio of the reaction as given in the equation shows that 2 moles of HCl produces 2 moles of water.
Therefore, the mole ratio of HCl and H₂O is 1 : 1
Four moles of H₂O will be produced by four molecules of HCl
The number of molecules of HCl in 1 mole of HCl is 6.02 * 10²³ molecules.
1 mole of every substance contains equal number of particles.
Hence, 1 mole of water will contain 6.02 * 10²³ molecules.
Based on the mole ratio of the reaction, four molecules of HCl are needed to produce four molecules of H₂O.
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Johnny calculates from an experiment that he has 22.7 g of carbon. However, he should have gotten 21.8 g of carbon which was the actual value for this experiment. Calculate Johnny's percent error and round to the hundreths place.
Johnny's percentage error is calculated as= 41%
Calculation of percentage errorThe quantity of carbon Johnny should have (actual value) = 21.8 g
The quantity of carbon Johnny was able to calculate = 22.7 g
To calculate the percentage error, subtract the actual value from the estimated value. That is,
22.7 - 21.8 g = 0.9 g
This error value obtained is divided by the actual value ( 21.8 g)
0.9 / 21.8 = 0.41
Then multiply by 100%
0.41 × 100.= 41%
Therefore, Johnny's percentage error is calculated as = 41 %
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Road salt is used in northern climates by the metric ton. How many moles of calcium chloride (CaCl2) does a town use daily if it uses 1.2 metric tons a day? 1 metric ton = 1000 kilograms
10.81 mole of calcium chloride (CaCl2) does a town use daily if it uses 1.2 metric tons a day mole is a standard scientific unit for the calculation of large amounts of very small entities
Here given data is 1 metric ton = 1000 kilograms then 1.2 metric tons = 1200 kilogram then we have to find moles of calcium chloride (CaCl₂) =?
Then here concept are moles, molar mass of a substance is the mass in grams of one mole of that substance
Here given molar mass of (CaCl₂) = 110.98
So, given molar mass of calcium chloride (CaCl₂) / 1200
n = 1200/110.98 = 10.81 mole
So, 10.81 mole of calcium chloride (CaCl2) does a town use daily if it uses 1.2 metric tons a day
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If we took 4 liters of gas at 0.7 atmospheres (the pressure of the atmosphere in Denver, Colorado) and compressed it to a pressure of 6.0 x 104 atmospheres, what would the volume of that gas be?
Just as height and breadth are ways to express size, volume is a measure of an object's size.
What is the gas's volume?
The area occupied by gaseous particles under normal temperature and pressure circumstances is referred to as the volume of gas. It is identified as a "V. The letter "L" stands for "liters," the SI unit of volume. At normal temperature, a mole of gas has a volume of 24 m3, or 24 000 cm3. The molar volume of a gas is the name given to this quantity. For instance, the formula for calculating the volume of 40 moles of gas at a temperature of 250 K and a pressure of 1013 hPa is V = nRT/p = 40 * 8.31446261815324.
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list of equipment needed for investigating the reaction of lemon juice and sodium hydrogencarbonate
1. Grab a couple of lemons!
2. Baking Powder.
3. Colored food.
4. Dawn Dishwashing Soap
5. Tray, plate, or bowl
6. Sticks for making crafts.
7. Juice of lemon
Regina conducted an investigation to determine whether earthworms add nutrients to soil. she used two pots of soil. she added three earthworms to the first pot. she did not add any earthworms to the second pot, which was the control. regina tested the nutrient levels of the soil in both pots after two weeks. what type of investigation is regina conducting? descriptive comparative experimental procedural
Regina conducted an investigation to determine whether earthworms add nutrients to soil. she used two pots of soil. she added three earthworms to the first pot. she did not add any earthworms to the second pot, which was the control. Regina tested the nutrient levels of the soil in both pots after two weeks. The type of investigation is Regina conducting is experimental.
Experimental study is a quantitative method of research which allows to visualize the effects of variable change by keeping other variables in control. These involve random experimental control.
There is an independent variable, a dependent variable and a set up which is meant for control in an experimental study. The control is to establish the validity of the experimental study.
Experiments creates the cause and effect relationship. This experiment was designed to know whether the earthworms add any nutrient to the soil.
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A student decided not to reweigh his erlenmeyer flask throughout the calibration lab. after a given trial, he shook leftover water out of his erlenmeyer flask by wrist action and assumed the mass of his flask was constant. then, he reused the flask for the next trial and so on. given this information, is this an example of random or systematic error? why?
He decided not to dry his glassware throughout the calibration lab.
Instead, he shook leftover water out of his Erlenmeyer flask by the
wrist action.
This is an example of a random error.
What is the random error?
Random errors also referred to as human error, depending on how well the experimenter is able to conduct the experiment and interpret the data.
Since the results could be either too high or too low, these errors are random.
Random error frequently determines or limits the experiment's precision.
For instance, the random error would be the reaction time if we were timing the revolution of a turntable that was rotating steadily.
A delay in the beginning (an underestimation of the actual result) or a delay in ending would cause a variation in our reaction time (an overestimation of the actual result).
Random errors differ from systematic errors in both magnitude and direction.
However, the average of a set of measured positions can be calculated, and that average is probably more accurate than the majority of the measurements.
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This is an example of a random error.
What is a random error?The term "random error" describes errors that happen when the conditions under which an experiment is conducted change.
A chance discrepancy between an object's true and observed values is known as a random error.
Chance is the cause of the random error.
When the same weight is placed on an electronic scale multiple times, the readings can vary randomly from one reading to the next. This is an example of a random error.
These discrepancies between the readings and the actual weight are due to random errors in the scale's weight measurements.
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