Complete the following statement with a single word: percent error is a quantitative measure of the inaccuracy of a measurement or result.
The percent error is an error between an observed value and the true value of a measurement.
Percent Error = (Actual Value - Estimated Value / Actual Value) × 100%
Accuracy is the closeness of a measurement to the true value. Accuracy is the basic of analytical chemistry.
There are three types of error in chemistry: gross errors, random errors and systematic errors.
Percent error indicates value of an error during the experiment.
Percent error shows how unavoidable errors affect the experimental results.
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Determine the density of a regular solid with a mass of 296.3 g and dimensions of 7.9cm x 9.1cm x 4.9cm. Round your answer to 2 decimal places.
Taking into account the definition of density, the density of the regular solid is 0.84 g/cm³.
Definition of densityDensity is defined as the property that indicates the amount of mass in a certain volume of a substance.
The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
density= mass÷ volume
Density of the regular solidIn this case, you know that:
Mass= 296.3 gVolume= 7.9 cm× 9.1 cm× 4.9 cm=352. 261 cm³Replacing in the definition of density:
density= 296.3 g÷ 352. 261 cm³
Solving:
density= 0.84 g/cm³
In summary, the density of the regular solid is 0.84 g/cm³.
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In which solvent would cyclohexane have the lowest solubility, 3-pentanol, diethyl ether, water, or octane?
It is a good idea to keep in mind which solvents can dissolve which solvents by saying "like dissolves like." Purely aromatic hydrocarbon cyclohexane is extremely hydrophobic and nonpolar, therefore it won't dissolve in a solvent that is highly polar or hydrophilic like water.
What is solubility?
The maximum amount of a material that may dissolve in another is known as its solubility. A saturated solution is created when a solvent can hold the most solute while still maintaining equilibrium.
The saying "like dissolves like" is a helpful reminder of which solvents can dissolve which solvents. Cyclohexane, a purely aromatic hydrocarbon, is exceedingly hydrophobic and nonpolar, therefore it won't dissolve in a highly polar or hydrophilic solvent like water.
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What is the steel chemical diagram for N2H3F
What is the name of this model of the atom
Answer:
Tetravalent atom or tetra-atom
isn't the activity in Bq
What units are used to measure carbon dioxide (co2)?
a. millibars (mb)
b. parts per billion (ppb)
c. percent (%)
d. parts per million (ppm)
The units that are used to measure carbon dioxide (CO₂) are b. parts per billion (ppb) and d. parts per million (ppm).
ppb stands for parts per billion.
Parts per billion (10⁻⁹) is present at one thousand millionth of a gram per gram of sample solution.
Parts-per-million (10⁻⁶) is present at one-millionth of a gram per gram of sample solution. For example 10 mg/kg of CO₂ = 10 ppm CO₂.
Chemists use ppm and ppb because amount of carbon dioxide is so small.
Milibars are units for the pressure.
Percent is too big unit for the amount of carbon dioxide.
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Sometimes when performing a crystallization, one solvent alone will not work and you have to use a solvent-pair. Will the solvent pair hexane and diethyl ether work? why or why not?.
This largely depends on the solubility and polarity of the substance that needs to be recrystallized.
When a substance needs to be recrystallized, the ideal solvent system for the process will not dissolve it at all at low temperatures, it will dissolve it completely at the solvent's boiling point, and the impurities will be dissolved at all temperatures. While both hexane and diethyl ether are considered non-polar solvents, diethyl ether is more polar than hexane so the combination of the two (depending on the ratio) might have all the required properties. It is, however, more common to use a more polar solvent in combination with hexane, such as ethyl acetate.
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A book is pushed off the edge of a table. At what point during the fall will the potential and kinetic energy be equal? A. 1/4 of the way down B. 1/2 of the way down C. 3/4 of the way down D. right before it hits the ground
The point during the fall will the potential and kinetic energy be equal is B. 1/2 of the way down.
How to illustrate the information?It should be noted that the point when the potential and kinetic energy be equal will be at the midpoint of the initial height.
Therefore, the object possesses potential energy when at rest and then kinetic energy when in motion.
When KE = PE
We can deduce that KE+PE = MGH and PE+ PE = MGH
This implies that MGH + MGH= 2MGH and 2H = H
Therefore, the point during the fall will the potential and kinetic energy be equal is B. 1/2 of the way down.
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What are the five types of colloids? Describe each
Does a reaction occur when aqueous solutions of sodium sulfate and barium nitrate are combined?
One soluble salt, sodium nitrate, and one insoluble salt, barium sulphate, are created when barium nitrate and sodium sulphate react together.
We have a double replacement reaction for this reaction. Balanced Approaches: It is a double replacement reaction in which the positions of the sodium and barium atoms are switched. When dissolved substances react, one (or more) solid products are produced, which is known as a precipitation reaction. These kinds of reactions, which are also occasionally known as double displacement, double replacement, or metathesis reactions, frequently involve the exchange of ions between ionic compounds in aqueous solutions. For a clear solution, replace a group 1 nitrate with barium nitrate. For a white precipitate, replace a group 1 nitrate with magnesium or calcium nitrate.
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I need to find the calculated error and calculated percent error how would I answer this ?
The absolute amount of the discrepancy or simply error between the measured value and the actual value is multiplied by 100 and divided by the actual value to determine the percent error.
How Can the Percent Error Be Found?Follow these easy procedures to determine the error rate-
1. Don't take into consideration any minus (-) signs when calculating the inaccuracy (by deducting the predicted value from the actual value). take the error's absolute value, etc.
Approximate Value - Exact Value = Absolute Error
2. Subtract the mistake from the accurate figure (sometimes, we may get a decimal number).
3. Relative error is the difference between the precise and approximative values.
4. Add a "%" following the conversion to a percentage (by multiplying by 100).
|Approximate Value - Exact Value|/Exact Value 100% Percent Error
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When performing an extraction with between an aqueous solution and organic solution what determines which layer ends up the bottom layer in the separatory funnel?.
When performing an extraction with between an aqueous solution and organic solution density determines which layer ends up the bottom layer in the separatory funnel.
A separatory funnel is used to separate liquids.
Liquid with greater density will end up the bottom layer in the separatory funnel.
Water is polar substance as the аqueous layer, while organic layer is nonpolar substance.
Water is a “universal" solvent.
Density is the mass of an object divided by its volume. The SI derived unit for density is the kilogram/cubic meter, but chemist usually use gram per milimeter.
Volume is the amount of space that a substance occupies.
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S the sample size gets larger, the size of the correlation necessary for significance ____. group of answer choices also gets larger
As the sample size gets larger, the size of the correlation necessary for significance gets smaller.
Sample size determination is the process of deciding how many observations or replicates to include in a statistical sample. The sample size is an important consideration in any empirical study that aims to infer information about a population from a sample.
The response depends on the size of your sample. In all other respects, the larger the sample, the more consistent and trustworthy the association is. Correlations based on small samples are frequently very incorrect.
For both the bivariate correlation and the Pearson correlation, sample sizes are estimated to determine the number of persons that must be surveyed, polled, or sampled in order to find the test significant at the chosen level of significance. This is the probability of creating a Type.
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What is the driving force for losing a proton as the last step in electrophilic aromatic substitution?
To rearomatize the ring system is the driving force for losing a proton as the last step in electrophilic aromatic substitution.
An atom that is connected to an aromatic ring is replaced with an electrophile in electrophilic aromatic substitution processes. Examples of these reactions include Friedel-Crafts reactions, aromatic nitrations, and aromatic sulphonations. An electrophile displaces a functional group in a molecule, which is generally, but not always, aromatic, in an electrophilic substitution process. Aromatic compounds are known for their aromatic substitution reactions, which are frequently used to introduce functional groups into benzene rings.
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Suppose that when you exercise, you consume 100 g of glucose and that all the energy released as heat remains in your body at 37 c. what is the change in entropy of your body?
The change in entropy of our body will be 5.03 kJ.
Entropy is a thermodynamic function that tells us about the degree of disorder of a particular system. It is represented using the letter “S”.
The change in entropy of a system is given by the following equation
ΔS = ΔH/T
Here ΔH is the heat released
T is the temperature of the system
In the given case, glucose is given.
The value of ΔH for one-mole glucose is 2808 kJ/mol.
The mass of one-mole glucose is 180 g, therefore 100 g of glucose has
ΔH = 2808/180 x 100 = 1560 kJ/mol.
Putting ΔH= 1560 kJ and T= 37° C = 310 K in the above equation
ΔS = 1560/310
ΔS = 5.03 kJ/K
Thus, the change in entropy of our body will be 5.03 kJ.
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The valence orbitals of a central atom surrounded by three regions of electron density consist of a set of _________ sp2 hybrid orbitals.
The valence orbitals of a central atom surrounded by three regions of electron density consist of a set of three sp2 hybrid orbitals.
In sp2 hybridization the one s-orbital mixes with only two 2p-orbitals and form three sp2 hybrid orbitals (see the picture below).
When atomic orbitals hybridize, the valence electrons occupy the hybrid orbitals.
For example, central boron atom in boron hydride (BH3) has three sp2 hybrid orbitals. The molecule of boron hydride is trigonal planar. The boron atom form three single bonds with hydrogen atoms. The approximate H-B-H bond angle is 120°.
Other examples are molecules C2H4 (ethene), ClNO (nitrosyl chloride) and CH2O (formaldehyde).
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Which elements are not likely to bond with other elements? Why
okay!! here's the question
A force of 50 N acts upon a block of wood accelerating at 4m/s* 2. What is the mass of the block of wood?
how much?
Answer:
5 is the correct answer of this
Answer:
m=2.0796kgmass or 20.3938N
Explanation:
m=Fa/K
convert 50N to Kg = 50N( .10197kg/1N) cancel N = 5.0958kgf
m= 5.0958kgf(4m/s²) all over K
k= 9.8066(kgm•m/kgf•s²)
m= 5.0958kgf(4m/s²) all over 9.8066 kgm•m/kgf•s²)
m= 2.0796kgm
in Newton
m= 20.3938N..
sana tama.
What is the force required to accelerate a 10 KG object at 1 M/S/S
PLEASE I REALLY NEED THIS RN PLEASE
The force required to accelerate a 10 kg object at 1 M/S/S is 10 N.
What is force?Force is defined as an action that has the capability of changing the motion of an object.It has both magnitude as well as direction owing to which it can be described as a vector quantity.
It's SI unit is Newton and is represented by symbol F.It can be measured by instruments named force gauge,spring scale and load cell.It is an external agent which can change the body's state of motion or rest.
There are two types of forces
1) contact force
2)non-contact force
Force is calculated by the formula,
F=m×a
where m=mass and a=acceleration
In the given problem ,m=10 kg and a=1 ms[tex]^-2[/tex]
substituting the values in the formula,
F=10×1=10 N.
Thus, the force acting on object of 10 kg is 10 N when acceleration is 1 ms[tex]^-2[/tex].
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For a reaction with Ea = 75.0 kj/mol
Calculate the fraction of the collisions at 298k having energies greater than or equal to Ea.
The fraction of collisions at 298K are 7.14 x [tex]10^-^1^4[/tex]
Based on the collision theory, effective changes are only produced by a certain number of impacts between suitable reactant components with the right orientation; these successful transformations are referred to as successful fractions of collisions.
According to the collision theory, for a chemical interaction to take place, the reacting molecules must come into contact with one another. The frequency of collisions affects the reaction's rate. According to the idea, responding particles frequently encounter without reacting.
Given:
Ea = 75KJ/mol
R = 8.314J/molK
T = 298K
To find:
Fraction of collisions, f = ?
Formula:
Fraction of Collisions, [tex]f = e^\frac{-Ea}{RT}[/tex]
Calculations:
f = [tex]e ^ \frac{-75000}{8.314 * 298}[/tex]
f = 7.14 x [tex]10^-^1^4[/tex]
Result:
The fraction of collisions having sufficient energy are 7.14 x [tex]10^-^1^4[/tex].
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A student looks at an animated model of the plants orbiting the sun. What should the model show to demonstrate why plants do not end up going into the sun? (1 point)
A. The planets are far away so they cannot go into the sun.
B. The planets move too fast to go into the sun.
C. The planets are made of rock and gas and cannot go into the sun.
D. The planets are too big to go into the sun.
The model shown should demonstrate why planets do not end up going into the sun as follows: The planets move too fast to go into the sun. (option A).
What are planets?Planets are the bodies that orbit round the sun. The planets are seven in number as follows:
EarthMarsMercuryJupiterSaturnVenusPlutoAccording to this question, a student looks at an animated model of the planets orbiting the sun. In reality, this planets do not go into the sun because they are far away from the sun.
The Earth as a planet for example is not moving fast enough to escape the sun's gravity and leave the solar system, but it is going too fast to be pulled into the sun. Therefore, it keeps going around and around in an orbital manner.
Therefore, the model shown should demonstrate why planets do not end up going into the sun as follows: The planets move too fast to go into the sun.
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Which of the following best describes the wagon’s change in energy as it coasts from point X to point Y?
From the question, we can see that; the wagon has more gravitational potential energy at point Y than point X.
What is energy?We know that energy is the ability to do work. Work is said to be done when the force applied moves a distance in the direction of the force. In this case, we could say that there are several forms of energy such as;
Mechanical energyElectrical energyChemical energy Sound energy and others.We also know that according to the laws of thermodynamics, energy could be transformed from one form to another. Energy can not be created nor destroyed. This is the summary of the first and second laws of thermodynamics.As such, we can see that the Wagon is at higher elevation at point Y than on point X. Recall that the gravitational potential energy has to do with the height of the object.
Having said all these, it is now possible to conclude that; the wagon has more gravitational potential energy at point Y than point X.
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HELPPPPPP PLEASEEEEE
What mass of naoh is required to react exactly with 25.0 ml of 2.0 m h2so4?
a. 2.0 g
b. 100 g
c. 4.0 g
d. 1.0 g
e. none of these choices are correct.
4.0 g mass of NaOH is required to react exactly with 25.0 ml of 2.0 m H₂SO₄ which is option (c) .
It is one in every of the foremost wide used unit of concentration and is denoted by M. it's outlined as no. of moles of substance gift in one cubic decimeter of answer. Molarity = no of moles / Volume of solution (in liters)It is given that volume of solution = 25.0 ml = 0.025L and molarity of H₂SO₄ = 2.0 M .
Using molarity , we get
Moles of H₂SO₄ = Volume of solution × Molarity
Moles of H₂SO₄ = 0.025L × 2 = 0.05 moles
2NaOH + H₂SO₄ = Na₂SO₄ + 2H₂O
As sulphuric acid is a dibasic acid,so 2 NaOH molecules are require to neutralise 1 sulphuric acid molecule.
Hence, Moles of NaOH require = 0.05 × 2 = 0.1 mol.
Molar mass of NaOH = 40g
Mass of NaOH = mole × molar mass
= 0.1 × 40
= 4.0 g
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Explain why a solvent that can dissolve the solute when it is cold is useless for recrystallizations.
This is because while the chilled solvent is saturated and should release some crystal .
What impact does temperature have on the solubility recrystallization process?The volume of solute that can be dissolved in the solvent grows with temperature. The result becomes less soluble as the solution cools, and the solute molecules cluster to form nuclei, which are tiny stable crystals. This is the nucleation stage in the crystallization process.
Because even through the chilled solvent is saturated and should start to crystallise , some of the desired material will still be dissolved in the chilled solvent and will be lost when the crystal and solvent are seperated.
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A piece of copper has a mass of 940 kg. what is the volume of the sample, in units of liters?
The volume of a piece of copper is 104.91 liters.
d(copper metal) = 8.96 kg/L; density of a copper metal
m(copper metal) = 940 kg; mass of a copper metal
V(copper metal) = m(copper metal) ÷ d(copper metal)
V(copper metal) = 940 kg ÷ 8.96 kg/L
V(copper metal) = 104.91 L; the volume of a copper metal
Volume is the amount of space that a substance occupies.
Density is the mass of an object divided by its volume. The SI derived unit for density is the kilogram/cubic meter, but chemist usually use gram per milimeter.
Mass is a fundamental measure of the amount of matter in the object.
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Sugar is easily soluble in water and has a molar mass of 342.30 g/mol. what is the molar concentration of a 265.7 ml aqueous solution prepared with 74.2 g of sugar?
The molar concentration of the sugar solution is 0.815M
The best approach to describe a solute concentration in a solution is by molar concentration. According to the formula M = mol/L, molarity is defined as the total number of moles of solute dissolved in one litre of solution.
Given:
Mass, m = 74.2g
Molar mass, mm = 342.30g/mol
Volume, v = 265.7ml
To find:
Molar concentration, M = ?
Formula:
Molar concentration, M = mole / dm^3 of solution
Calculations:
No. of moles = Mass, m / molar mass, mm
No. of moles = 74.2 / 342.3
No. of moles = 0.216 mol
Molar concentration, M = 0.216 / 0.265
Molar concentration = 0.815M
Result:
The molar concentration of the sugar solution is found to be 0.815M
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Life relies on two key reactions: the oxidation of glucose to produce co2 and water and the reaction of co2 and water to produce glucose. these reactions are?
These reactions are exergonic and endergonic.
An exergonic is spontaneous reaction. It occurs without the addition of external energy. ΔG (the change in Gibbs free energy) is negative.
An endergonic reaction requires free energy to proceed. ΔG (the change in Gibbs free energy) is positive.
Balanced chemical equation for reaction of the oxidation of glucose:
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + energy
C₆H₁₂O₆ is molecule of glucose
O₂ is molecule of oxygen
Balanced chemical equation for reaction of the production of glucose:
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂.
Plants convert solar energy into the chemical energy of sugars.
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What are some examples of geoscience processes that can change features of the earth's surface?
Surface processes such as erosion, movement, weathering, and the deposition of sediment can modify surface features, such as mountains, or create new features, such as canyons.
Have a great day!
The surface of the Earth is constantly changing as a result of geoscience processes such as weathering, erosion, and deposition. Systems on the planet interact to influence Earth's past, present, and future.
Geoscience investigates the processes that shape the Earth's surface, the resources humans utilize, and how water and ecosystems are related. It covers much more than just rocks and volcanoes. Chemistry, physics, biology, and arithmetic, as well as other scientific disciplines, are used in geoscience.
The surface of the Earth is constantly changing as a result of geoscience processes such as weathering, erosion, and deposition. Systems on the planet interact to influence Earth's past, present, and future.
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5. A 483 L balloon at 42° C is heated to 81° C. What will be the balloon's final volume?
A 483 L balloon at 42° C is heated to 81° C the balloon's final volume is 604.17.
What does volume over temperature mean?Volume-temperature (constant pressure) When pressure is constant, the volume of a gas is directly proportional to its temperature. Volume to temperature ratio is constant when pressure stays constant. Charles' law or Gay-law Lussac's are two names for this relationship.
Why is volume constant?A thermodynamic process known as an isochoric process, also known as a constant-volume process, isovolumetric process, or isometric process, occurs when the volume of a closed system going through the process stays constant.
Briefing:According to Charles law:
V1/T1 = V2/T2
initial temperature = 42⁰ C
42⁰ C+273 = 315 k
Final temperature = 81⁰ C
81⁰+273 = 354 k
V1/T1 = V2/T2
483L/315k = V2/354k
354 * 483 = 315 * V2
170982/283 = (315)V2/315
V2 = 604.17 L
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