To make sure the data they collect are accurate
scientific method is a method of procedure that has characterized natural science since the 17th century, consisting in systematic observation, measurement, and experiment, and the formulation, testing, and modification of hypothesesaction research are studies carried out in the course of an activity or occupation, typically in the field of education, to improve the methods and approach of those involvedresearch problem are the tatement about an area of concern, a condition to be improved upon, a difficulty to be eliminated, or a troubling question that exists in scholarly literature, in theory, or in practice that points to the needed for comprehensive understanding and deliberate investigationTo know more about scientific method visit :
https://brainly.com/question/7508826
#SPJ9
An experiment requires 18.0 g of cyclohexane, which has a density of 0.7781 g/mL at 25°C. What volume of cyclohexane should be used?
Taking into account the definition of density, the volume of cyclohexane should be 23.13 mL.
Definition of densityDensity is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space and allows us to measure the amount of mass in a certain volume of a substance.
The expression for the calculation of density is:
density= mass÷ volume
Volume of cyclohexaneIn this case, you know that:
Density= 0.7781 g/mLMass= 18 gReplacing in the definition of density:
0.7781 g/mL= 18 g÷ volume
Solving:
0.7781 g/mL ×volume= 18 g
volume= 18 g÷ 0.7781 g/mL
volume= 23.13 mL
In summary, the volume of cyclohexane should be 23.13 mL.
Learn more about density:
brainly.com/question/952755
brainly.com/question/1462554
#SPJ1
How much money will it cost to drive a school bus 94.00 miles if it gets 6.500 miles per gallon and gas costs $2.459/gallon?
Answer:
It will cost $35.5602
Explanation:
$2.459 /6.5 (mpg) = 0.3783 (cents per mile)
$0.3783 (cost per mile) * 94 (total miles) = $35.5602 total
There are 94,608,000 seconds using conversion factor in 3 years.
First, let's calculate the number of seconds in 1 year, and then multiply it by 3 to get the total number of seconds in 3 years.
Conversion factors:
1 year = 365 days
1 day = 24 hours
1 hour = 60 minutes
1 minute = 60 seconds
Step 1: Calculate the number of seconds in 1 year.
[tex]\[\text{1 year} = 365 \text{ days} \times \left(24 \text{ hours/1 day}\right) \times \left(60 \text{ minutes/1 hour}\right) \times \left(60 \text{ seconds/1 minute}\right)[/tex]
Step 2: Calculate the number of seconds in 3 years.
[tex]\[\text{3 years} = 3 \times \left(365 \text{ days} \times \left(24 \text{ hours/1 day}\right) \times \left(60 \text{ minutes/1 hour}\right) \times \left(60 \text{ seconds/1 minute}\right)\right)\][/tex]
Now, let's perform the calculations:
1 year = 365 * 24 * 60 * 60 seconds
= 31,536,000 seconds
3 years = 3 *31,536,000
= 94,608,000 seconds
So, there are 94,608,000 seconds in 3 years.
Learn more about Unit Conversion here:
https://brainly.com/question/28600662
#SPJ7
According to bohr's model, when does an electron emit electromagnetic radiation?
According to Bohr's model, electron emit electromagnetic radiation when an electron moves from the higher energy orbit to the lower energy orbit of an atom.
Niels Bohr (1885–1962) proposed a model for the hydrogen atom that explained its atomic emission spectrum.
According to the Bohr model of the atom:
1. Energy levels of electrons are discrete (certain discrete values of energy), that is why hydrogen shows discrete, bright, colored lines.
2. Electrons orbit the nucleus in orbits that have a set size and energy.
3. Electrons can jump from one energy level to another, absorbing or emitting electromagnetic radiation with a frequency ν (energy difference of the levels).
More about Bohr's model: brainly.com/question/18002213
#SPJ4
Your general impression suggests that your immediate action should be to: ____.
a. call for additional help.
b. apply oxygen.
c. dress her burns.
d. apply spinal immobilization.
Your general impression suggests that your immediate action should be to call for additional help. The correct option is a.
What is immediate action?Immediate actions are the actions that are taken without taking any time. These actions are taken when there is no time to think, and you should immediately think about the actions. The emergency condition needs immediate help.
During the time of general impression, one should immediately call for additional help. Additional people will give you suggestions for the problem.
Thus, the correct option is a. call for additional help.
To learn more about immediate action, refer to the link:
https://brainly.com/question/28084658
#SPJ4
How many o atoms are in 259 g of c12h21o9? molar mass of c12h21o9 = 309.29 g/mol
The number of atoms in 259 g of C₁₂H₂₁O₉ is 45 x 10²³ oxygen.
What is molar mass?The molar mass of many compounds can be calculated by dividing the mass of the compound by the number of moles of the compound.
Given the molar mass is 309.29 g/mol
Given weight= 259g
number of moles = mass / molar mass
259g / 309.29g/mol =0.837mol
1 mol contains 6.022 x 10²³ molecules
0.837 mol contain 6.022 x 1023 x 0.837 = 5.0 x 10²³ molecules
1 molecule of C₁₂H₂₁O₉ contains 9 oxygen atoms
5.0 x 10²³ molecules of C₁₂H₂₁O₉ contain 9x 5 x 10²³ oxygen atoms.
=45 x 10²³ oxygen atoms
Thus, the number of atoms in 259 g of C₁₂H₂₁O₉ is 45 x 10²³ oxygen atoms
To learn more about molar mass, refer to the link:
https://brainly.com/question/22997914
#SPJ4
Answer:
Explanation: your the best
A 2. 50 x 10-3 kg sample of oxygen gas at 31. 0 °c has an average molecular velocity of 487 m/s. What is the ke of the gas? report your answer in joules to the nearest whole number.
A 2. 50 x 10-3 kg sample of oxygen gas at 31. 0 °c has an average molecular velocity of 487 m/s then ke of the gas is 5,929.225 J
Here we have to find kinetic energy of gas and sample is given as 2. 50 x 10-3 kg and velocity of 487 m/s so, formula to find kinetic energy is:
KE=1/2mv²
KE=1/2×2. 50 x 10⁻³×(487)²
KE=5,929.225kgm²/s²
Here 1 joule = 1 kgm²/s² so
1×5,929.225=5,929.225 J
Know more about kinetic energy
https://brainly.com/question/28496696
#SPJ4
What chemical bonds stabilize the different structures in primary, secondary, tertiary and quaternary structures?.
Peptide bonds, hydrogen bonds, disulfide linkages, van der Waals, and electrostatic forces of attraction are the chemical bonds that stabilize the different structures in primary, secondary, tertiary, and quaternary structures.
The advanced structure of proteins gives rise to two kinds of major molecular shapes which are fibrous as well as globular structures. The main forces which are involved in stabilizing the secondary along with the tertiary structures of proteins include hydrogen bonds, disulfide type linkages, van der Waals attraction, and electrostatic forces of attraction.
The primary structure is generally determined by adjoining peptide bonds where the link is adjoining amino acids in sequential order. Tertiary structure is determined by the existence of disulfide bonds in between hydrophobic interactions as well as cysteine residues whereas the quaternary type structure is determined by multiple subunits of a protein that undergo various interactions.
Hydrogen bonds exist in a protein molecule as its large number can form between adjacent regions of the polypeptide chain in folded form and stabilize its three-dimensional kind of shape.
Learn to know more about levels of protein structure on
https://brainly.com/question/17338734
#SPJ4
Calculate the mass of dinitrogen tetroxide. (N₂O4) that contains a billion (1.00 × 10º) nitrogen atoms.
Answer:
7.6410^-14 grams N2O4
Explanation:
I will assume that "contains a billion (1.00 × 10º)" is meant to read "(contains a billion (1.00 × 10^9)."
One mole of anything contain 6.02x10^23 particles of that thing (atoms, molecules, paper clips, suns, etc.). If there are 1.00x10^9 particles of N2O4, we have:
(1.00x10^9 particles N)/(6.02x10^23 particles/mole) = 1.66x10^-15 mole of N atoms
Each mole of N2O4 contains 2 moles of N atoms:
(1 mole N2O4)/(2 moles N atoms)
(1.66x10^-15 mole of N atoms)*(1 mole N2O4)/(2 moles N atoms) =
8.31x10^-16 moles N2O4
The molar mass of N2O4 is 92.01 g/mole.
(8.31x10^-16 moles N2O4)*(92.01 g/mole) = 7.6410^-14 grams N2O4
2.what is the purpose of the sodium sulfate? (1 pt) why did you rinse the sodium sulfate with an additional portion of methylene chloride?
To ensure that the 9-Fluorenone was totally dry, it had to be washed with methylene chloride. To make sure that methylene chloride is present in a pure solution, sodium sulfate binds to water and precipitates.
What is the purpose of the sodium sulfate?Although it has numerous additional uses, sodium sulfate is primarily employed in the production of detergents and in the Kraft process of paper pulping. The decahydrate's natural mineral form, mirabilite, accounts for about half of the world's output, with the other half coming from chemical byproducts. Sodium sulfate was used as a drying, isolating, and anhydrous salt for the 9-fluorenone.To make sure that methylene chloride is present in a pure solution, sodium sulfate binds to water and precipitates.The sodium salt of sulfuric acid is known as sodium sulfate. Na2SO4 is the chemical formula for sodium sulfate. The mineral thenardite, which is also known as anhydrous sulfate, is described as a white, crystalline solid, whereas the decahydrate Na2SO4. 10H2O is also known as Glauber's salt or the mirabilis salt.
To know more about sodium sulfate, refer:
https://brainly.com/question/23509646
#SPJ4
Calcium carbide, CaC2, is manufactured by reducing lime with carbon at high temperature. (The carbide is used in turn to make acetylene, an industrially important organic chemical.) CaO(s)+3C(s)→CaC2(s)+CO(g) ΔH=464.8kJ Calculate the quantity of energy, in MJ, transferred when a metric ton(1000 kg) of CaC2(s) is manufactured. Ca = 40 g/mol C = 12 g/mol O = 16 g/mol
The energy of the carbide released is 7262.5MJ.
What is the energy?We know that the reaction between calcium oxide and carbon occurs in accordance with the reaction; [tex]CaO(s)+3C(s)----- > CaC_{2} (s)+CO(g)[/tex]. The reaction is seen to produce 464.8kJ of energy per mole of carbide produced.
Number of moles of [tex]CaC_{2}[/tex] produced = 1000 * 10^3 g/64 g/mol
= 15625 moles of calcium carbide
If 1 mole of [tex]CaC_{2}[/tex] transfers 464.8 * 10^3 J
15625 moles of calcium carbide transfers 15625 moles * 464.8 * 10^3 J/ 1 mol
= 7262.5MJ
Learn more about reaction enthalpy:https://brainly.com/question/1657608
#SPJ1
why are group O called inert gases
Answer:
They are called inert gases because they are stable and non-reactive. They have a full outer shell of valence electrons which gives them little tendency to participate in chemical reactions.
Explanation:
They are also know as the "noble" gases.
During the breakdown of fatty acids, not all acetyl coa enters the citric acid cycle, and your body converts some acetyl coa to?
During the breakdown of fatty acids, not all acetyl CoA enters the citric acid cycle, and your body converts some acetyl CoA to ketone bodies.
Acids are molecules or ions that can donate protons, known as Bronsted-Lowry acids, or form covalent bonds with electron pairs, known as Lewis acids. The first category of acids is proton donors or Brønsted-Lowry acids.
Blood is normally slightly alkaline, with a normal pH range of about 7.35 to 7.45. Normally, the body keeps blood pH near 7.40. Doctors measure a person's acid-base balance by measuring the pH of the blood and the levels of carbon dioxide (acid) and bicarbonate (base). No oil is either an acid or a base. Neutral. Oil is a neutral, nonpolar chemical. That is, it is a viscous liquid at room temperature. It is immiscible with water, but soluble in alcohol and ether.
Learn more about acid here
https://brainly.com/question/25148363
#SPJ4
If 40 kcal of heat is added to 1.0 kg of water, what is the resulting temperature change?
The resulting temperature change is: 40 degrees c
Here given heat added to system 40kcl
Weight of water 1kg we know the specific heat of water is
S= 4.2 J/g \degree c=1 cal/g\degree c
Q=40kcal m=1.0 kg=4000 g
We have the heat transfer equation given by
Q= ms\Delta t where Q=heat energy m=mass
\Delta t=change in temperature
Put the values and we'll have a change in temperature
\Delta t= [tex]\frac{Q}{ms}[/tex]
\Delta t= 40 degree C
Temperature is a numerical expression of how hot a substance or radiation is.
There are three different types of temperature scales: those that are defined by the average translational kinetic energy per freely moving microscopic particle, like an atom, molecule, or electron, in a body, like the SI scale; those that rely only on macroscopic properties and thermodynamic principles, like Kelvin's original definition; and those that are not defined by theoretical principles but rather by useful empirical properties of particulate matter.
A thermometer is used to determine temperature. It is calibrated using different temperature scales that historically defined themselves using different reference points and thermometric substances.
To learn more about temperature visit here :
https://brainly.com/question/23411503
#SPJ4
What would this frequency become if the person's breathing passage were filled with helium instead of air? assume the same temperature dependence for helium as for air.
1.07×10³Hz frequency become if the person's breathing passage were filled with helium instead of air
Here, air temp is taken as 37.0°C if the person's breathing passage were filled with helium instead of air then we find out velocity of sound in the helium. here velocity of sound in the helium for 0°C is 965m/s
formula for velocity of sound in the helium :
Vw he=Vw at 0°C×√T/273
Whereas Vw he=965×√273+37/273
Vw he=1028m/s
Here we find frequency so fundamental freq=fundamental harmonic no 1(velocity/4(length of tube)
=1(1028/4×0.24)
f=1.07×10³Hz
Know more about frequency
https://brainly.com/question/28498951
#SPJ4
Suppose a graduated cylinder were not correctly calibrated. how would this affect the results of a measurement? how would it affect the results of a calculation using this measurement?
The volume measurements won't be accurate and will be either less than or more than the anticipated figure if the graduated cylinder is accurately calibrated (depending on if the error in calibration is higher or lower). Depending on the calibration error, the calculated value may be higher or lower than the real value.
What is calibration?
Setting up an instrument so that it can generate findings for samples that fall within a tolerable range is part of the calibration process. A key component of instrumentation design is eliminating or reducing conditions that lead to faulty measurements.
Calibration attempts to reduce any measurement uncertainty by confirming the precision of test apparatus. In measuring procedures, calibration quantifies and reduces mistakes or uncertainties to a manageable level.
To learn more about calibration click the given link
https://brainly.com/question/525672
#SPJ4
Which activity is the best demonstration of J.J. Thomson's use of creativity in his work?
Answer:
Thomson used creativity to interpret the results of the cathode ray tube experiment. Explain how the atomic theory was modified from Dalton's theory to Rutherford's.
Convert 175mm to centimeters
Answer: 17.5 cm
Explanation:
10 mm=1 cm
175mm * 1 cm/10 mm=
175/10 cm=17.5 cm
-1.42, 3, 32.5%, √4, 2³, −0.375, 3/8 as a decimal least to greatest
Answer:
-1.42, -0.375, 32.5% (.325), 3/8 (.375), √4 (2.0), 3 (3.0), 2³ (8.0)
Suggest a reasonable synthetic strategy for the synthesis of 4-methyl-1,4-pentanediol from methyl-4-hydroxybutanoate hoch2ch2ch2cooch3. please show all arrow pushing for the proposed reaction as well.
A reasonable synthetic strategy for the synthesis of 4-methyl-1,4-pentanediol from methyl-4-hydroxybutanoate hoch2ch2ch2cooch3 and the reaction is Grignard reagent
Here in the Grignard reagent reaction chemical compound with the generic formula R-Mg-X where X is halogen and R is organic group and grignard reaction is the organometallic chemical reaction in which alkyl, allyl, or magnesium halide in the synthesis of that compound 4-methyl-1,4-pentanediol from methyl-4-hydroxybutanoate hoch2ch2ch2cooch3
Synthetic strategy for the synthesis of 4-methyl-1,4-pentanediol from methyl-4-hydroxybutanoate reaction are followed:
which of these measurements has only nonsignificant zeros? group of answer choices 506 ml 400. ml 0.0037 ml 60.0 ml
The answer to this question is
0.0037 ml is the measurement which has only non-significant figures.
The basic rules of significant figures are:
Every non-zero digit is a significant figure. For example, 456 has three significant figures.The zeros that are in-between are also significant. For example 809 has three significant figures.If the zeros are on the right side of a decimal point, they are also significant. For example, 8.00 has three significant figures. The leading zeros are not significant. For example, 0.07 has only two significant figures.If you need to learn more about significant figures, click here
https://brainly.com/question/14359464?referrer=searchResults
#SPJ4
What two effects a soluble impurity usually has on the melting point of a compound.
A soluble impurity usually has two effects on the melting point of a compound: an increase in melting point range and a decrease in melting point.
In chemistry, there are two types of impurities: soluble and insoluble.
Soluble impurities are those that dissolve in water quickly and also have a significant impact on the chemical properties of a compound such as a significant increase or decrease in the melting point and boiling point.
For example, salt, milk, and sugar compounds are soluble impurities.
Similarly, insoluble impurities remain undissolved when mixed in water and are also known as suspended impurities.
Examples of insoluble impurities are sand, oil, chalk, rocks, pebbles, etc.
If you need to learn more about compounds click here:
https://brainly.com/question/26487468
#SPJ4
Transmembrane proteins move ions or molecules across a membrane against their concentration gradient. True or false?.
The above statement is True.
Transmembrane proteins are the integral proteins, which helps ions and molecules to cross the membrane against the concentration gradient.
The transmembrane protein consist of both hydrophobic and hydrophilic amino acid side chains in his structure.
A membrane protein Is a protein molecule that is joined to or connected to an organelle’s or cell’s membrane. Depending on how the protein is connected to the membrane, membrane proteins can be divided into two categories, integral and peripheral membrane proteins.
The plasma membrane contains integral membrane proteins that are permanently ensconced there. They perform a variety of crucial functions like moving molecules through ion channels or transferring them across membranes.
To learn more about transmembrane protein, refer this link.
https://brainly.com/question/3167745
#SPJ4
There is more traffic between 8 and 9 in the morning because most people start work at 9. this would be a(n) ________.
There is more traffic between 8 and 9 in the morning because most people start work at 9. this would be a(n) hypothesis.
What does the term "hypothesis" mean?A hypothesis is a tested assertion about the relationship between two or more variables or a proposed justification for an observed phenomenon in a scientific context. It helps make a connection to the guiding idea and specific study topic.
It supports data processing and evaluates the study's validity and reliability. It provides a base or further proof to back up the study's validity.
A hypothesis can be categorised as being straightforward, complex, or direction-based.
To learn more about hypothesis from given link
https://brainly.com/question/606806
#SPJ4
2.0 moles of a monatomic ideal gas undergoes an isobaric process in which the temperature changes from 260 k to 320 k. what is the change in the internal energy of the gas?
The change in the internal energy of the gas is 1.5×10∧3 J.
The internal energy of an ideal gas is directly proportional to the temperature of the gas:
ΔE = 3/2 × n × R × ΔT
ΔT = 320 K - 260 K
ΔT = 60 K; change of the temperature
n = 2.0 mol: amount of a monatomic ideal gas
R = 8.1 J/mol×K;the ideal gas constant
ΔE = 3/2 × 2 mol × 8.1 J/mol×K × 60 K
ΔE = 1500 J
ΔE = 1.5×10∧3 J; the internal energy of the gas
Isobaric process is a type of process in which the pressure of the system stays constant.
More about an isobaric process: brainly.com/question/28106078
#SPJ4
Which triacylglycerol yields more energy on oxidation: one containing three residues of linolenic acid or three residues of stearic acid?
The Tricyglycerol yields more energy on oxidation is the one containing three residues of stearic acid because it get fully reduced.
when atom or ion loses the electron in the process called as oxidation or the loss of hydrogen is called as oxidation. when the atom or ion gain electron in the process called as reduction or gain of hydrogen is called as reduction
when the oxidation takes place the oxidation state of atom increases and when reduction takes place the oxidation state of species decreases.
when molecule is oxidized, it loses energy and when molecule is reduced , it gains energy
Thus ,we can say that,The triacyglycerol cotaining the three stearic acid residues yield more energy because it is fully reduced.
To learn more about Triacyglycerol here
https://brainly.com/question/13673197
#SPJ4
A molecule has an empirical formula of ch, and its molar mass is known to be 26 g/mol. What is its molecular formula?.
A molecule has an empirical formula of ch, and its molar mass is known to be 26 g/mol and the molecular formula is C₂H₂ ethyne
Molecular formula of compound is (CH)n and the given molar mass is 26g/mol
Molar mass of (CH)n, C=12=n(12+1)=13n
So 13n and n=2
=13×2=26 and given molar mass is also 26g/mol
So here two carbon and two hydrogen so molecular formula is C₂H₂ and name is ethyne
Know more about molecular formula
https://brainly.com/question/28496692
#SPJ4
A 28.0 g sample of nitrogen gas combines completely with 6.0 g of hydrogen gas to form ammonia. What is the mass of ammonia formed?
Taking into account the reaction stoichiometry, the mass of ammonia formed is 34 grams.
Reaction stoichiometryIn first place, the balanced reaction is:
N₂ + 3 H₂ → 2 NH₃
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
N₂: 1 moleH₂: 3 molesNH₃: 2 molesThe molar mass of the compounds is:
N₂: 28 g/moleH₂: 2 g/moleNH₃: 17 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
N₂: 1 mole ×28 g/mole= 28 gramsH₂: 3 moles ×2 g/mole= 6 gramsNH₃: 2 moles ×17 g/mole= 34 gramsMass of ammonia formedIn this case, by reaction stoichiometry, a 28.0 g sample of nitrogen gas combines completely with 6.0 g of hydrogen gas. So, the mass of ammonia formed is 34 grams.
In summary, by reaction stoichiometry, the mass of ammonia formed is 34 grams.
Learn more about the reaction stoichiometry:
brainly.com/question/24741074
brainly.com/question/24653699
#SPJ1
Petrification is the combination of 2 types of fossilization, replacement and permineralization, by which element? group of answer choices iron silica sodium carbon
The element involved in the process of petrification, replacement, and permineralization is silica, were petrification is the combination of 2 types of fossilization, replacement, and permineralization
Permineralization is a way of fossilization in which minerals ( like silica have deposited the fill the empty pores of shells or the hard animal parts). Petrification is a process where the organic material is converted to stone by replacing the original material and the pores with minerals, and Replacement occurs when the original bones or shells dissolve away and is replaced by a different mineral, which occurs along with permineralization, the whole process is called petrification.
To know more about fossilization refer to the link https://brainly.com/question/6867325?referrer=searchResults.
#SPJ4
An instrument can determine the half-life of an element with a 0.8% error. Radon-220 has a half-life of 52 s. What is the absolute error that could be expected measuring the half-life of radon-220?
The absolute error that could be expected when measuring the half-life of radon-220 is 0.416 s
Data obtained from the questionThe following data were obtained from the question:
Percentage error = 0.8%Actual measurement = 52 sAbsolute error =?How to determine the absolute error in measuring the half-lifeWe can obtaine the absolute error as illustrated below:
Percentage error = (Absolute error / Actaul measurement) × 100
0.8% = Absolute error / 52
0.008 = Absolute error / 52
Cross multiply
Absolute error = 0.008 ×52
Absolute error = 0.416 s
Thus, the absolute error in measuring the half-life is 0.416 s
Learn more about error:
https://brainly.com/question/24202332
#SPJ1
A ______________ is a type of mass movement where the material stays fairly coherent and moves over a well-defined surface.
a. rock fall
b. earthflow
c. debris avalanche
d. slump
e. debris flow
A Slump is a type of mass movement where the material stays fairly coherent and moves over a well-defined surface.
What is a slump?
A slump is a colloquial expression denoting a precipitous drop in commercial activity, trade, or market values. The term "slump" is particularly adaptable since it may be used to refer to both a brief, abrupt collapse and a longer-lasting, more steady period of low activity or value. There are downturns in the markets, the economy, industries, and incomes, among other things.
A slump typically refers to the start of a recession in economic terms. The months prior to the official announcement of a recession are simply referred to as a protracted economic slump because a recession is not officially announced until several months of decreased activity have passed.
To learn more about slump visit here :
https://brainly.com/question/646599
#SPJ4