Adding different amounts of contaminated water to each tube rather than diluting between tubes. Frequently, county health agencies will assist you with nitrate or bacteria testing. If not, you can ask a state-approved laboratory to test your water. Call the Safe Drinking Water Hotline at 800-426-4791 to locate one in your region.
Tests of the water's quality will reveal information on the condition of the river. The quality of the water might fluctuate over time, and this can be noticed by testing tubes it repeatedly. Temperature, pH, turbidity, salinity, nitrates, and phosphates are just a few of the variables that can be measured.
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Hat is the average mass of a manganese atom, given in amu and in kg? please do a unit conver- sion to calculate the mass in kg from the mass in amu
The average mass of a manganese atom is 54.94 amu or 9.12 x 10⁻²⁶ kg.
One unified atomic mass unit is approximately the mass of one nucleon (proton or neutron).
The unified atomic mass unit (amu) is a standard unit of atom mass.
One unified atomic mass unit is approximately the mass of the one nucleon (1.66·10⁻²⁷ kg)
Ar(Mn) = 54.94 amu; a relative atomic mass of manganese atom
m(Mn) = Ar(Mn) x 1.66·10⁻²⁷ kg
m(Mn) = 54.94 x 1.66·10⁻²⁷ kg
m(Mn) = 91.2 x 1.66·10⁻²⁷ kg
m(Mn) = 9.12 x 10⁻²⁶ kg; the average mass of a manganese atom
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a girl slides down a plastic slide. when she gets up, her hair is in the air. why is this so?
Answer:
because when girl slide down then her body was in full speed and after that she gets up her hair is in the air because when she slide down her hair was also blowing in the air and after that her body thinks that they're still sliding down.so,it happened.
At 80. 0°c and 12. 0 torr, the density of camphor vapor is 0. 0829 g/l. What is the molar mass of camphor? report your answer in grams per mole to the nearest whole number.
The molar mass of camphor in the nearest whole number is 152 g/mol.
Given,
P = 12 torr or 0.01579 atm
1 atm = 760 torr
Density = 0.0829 g/l
R = 0.0821 L.atm/mol.K
T = 273° K + 80° K
T = 353° K
As we know,
PV = nRT
Or, PV = mass × R × T / molar mass
Or, P = mass × R × T / volume × molar mass
Where, mass/ volume = density (d)
P = dRT / molar mass
Now putting the values,
0.01579 = 0.0829 × 0.0821 × 353 / molar mass
Or, molar mass = 152.156 g/mol.
Hence, the molar mass of camphor is 152 g/mol.
The molar mass of a chemical compound is defined because the mass of a pattern of that compound divided by way of the quantity of substance that's the variety of moles in that pattern, measured in moles. The molar mass is a bulk, not molecular, assets of a substance. The molar mass is a mean of many instances of the compound, which regularly vary in mass because of the presence of isotopes. most commonly, the molar mass is computed from the usual atomic weights and is as a result a terrestrial average and a characteristic of the relative abundance of the isotopes of the constituent atoms on the planet. The molar mass is appropriate for converting between the mass of a substance and the amount of a substance for bulk portions.To learn more about molar mass, visit: https://brainly.com/question/16377069
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When a capacitor has a potential difference between the plates it is said to be ? . one plate has an excess of electrons and one has a deficiency of electrons.
while a capacitor has a capability distinction between the plates it's miles said to be consistent.
each plates have different fee which means that one has better ability than the other.
V= potential distinction across the plates , when the capacity distinction V is improved , rate on capacitors additionally will increase such that the ratio Q/V , remains consistent i.e. capacitance remains consistent . due to the fact capacitance relies upon upon plate location , medium between plates and distance among plates .
consequently, whilst we be a part of them in parallel, charge will float from better to lower. and it continued to go with the flow until equilibrium (the whole method took just a few seconds), indicating that the capacity remains consistent.
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Is the emission spectrum of elements composed of individually colored lines or is it a continuous blend of colors like a rainbow?
The emission spectrum of elements is composed of individually colored lines.
When energy is provided to an element, the electrons present in it get excited and move to a higher energy level.
When these electrons return to their ground state, they release energy in the form of colored bands known as a spectrum(plural; spectra).
The spectrum emitted by a substance that has absorbed energy is known as the emission spectrum.
To produce an emission spectrum, energy is supplied to a sample by heating it or irradiating it.
The study of spectra is known as spectroscopy which helps in the identification and characterization of elements.
The emission spectrum of atoms does not have a continuous blend of colors like a rainbow.
Thus, the emission spectrum of elements is composed of individually colored lines.
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starting with 100 carbon-14 atoms,  how many would you expect to have after three half-lifes?
The 0.125 of original atoms are remaining after 3 half cycles
Half life of a radioactive element is the time in which its radioactive atoms reduce to half of its original value.
It is given that we have three half lives after which number of carbon atoms is to be found
After one half cycle, the number of carbon-14 atoms remaining will be 1/2 or 0.5
After the second half cycle , the number carbon 14 atoms remaining will be 1/2 of 1/2 which is equal to 1/4 or 0.25
After the third half cycle number of carbon-14 atoms remaining will be
1/2 of 1/4 which is 1/8 or 0.125
This can be easily found out using the formula of number of half cycles as [tex](1/2)^{n}[/tex]
where n is the number of half cycles after which number is to be found
Hence 0.125 of original atoms are remaining after 3 half cycles
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a scientist wants to identify an unknown compound on the basis of its physical properties. the substance is a white solid at room temperature. attempts to determine its boiling point were unsuccessful. using table 6, name the unknown compound
The substance is a white solid at room temperature is sodium chlorides
We have a table of physical properties of four different substances and unknown substance that we're trying to identify using that table. So we have four compounds 1. oxygen 2.water 3.sucrose and 4.sodium chloride. both oxygen and water are colorless, so can't be those two. Sucrose and sodium chloride both are solids.abou boiling point , sucrose does not have a boiling point. and sodium chloride does have a boiling point, so the unknown compound is sodium chloridesSodium Chloride is essential to maintain the electrolyte balance of fluids in a person's body. it is also known as salt table.
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Does the density of an object change if only the volume changes? Why or why not?
Yes, the density of an object change if only the volume changes because density is an intensive property.
What is density?Density is the measure of the mass of matter contained by a unit volume.
This suggests that the density of a substance is a function of the mass and volume of the substance.
However, an increase in volume decreases the overall density of an object, making it float.
Therefore, yes, the density of an object change if only the volume changes because density is an intensive property.
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At a ph ph of 7.25 , 7.25, the ratio of protonated glu molecules to deprotonated glutamate molecules is:_________
At a ph of 7.25 , the ratio of protonated glu molecules to deprotonated glutamate molecules is 1.100.
To find the ration of protonated glu molecules to deprotonated glutamate molecules we can used Henderson - hasselbalch equation :
ph = pka + log[A- ] / [HA]
At a ph value below the pka for each funtional group of amino acid , the functional group is protonated and the ph value above pka for the functional grroup its deprotonated.
Carboxylic acid funtional group of glutamic acid (glu) has pka = 4.25. so, the negatively charged deprotonated carboxylate form greater values of ph.
Hence , At a ph of 7.25, the ratio of protonated glum molecules to deprotonated glumtamate molecules is 1.100.
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When an acid is dissolved in water, how does it change the solution's ph?
When an acid is dissolved in water, by releasing protons into the solution, it lowers the pH.
What is pH?
The letters pH stand for the potential of hydrogen since pH is essentially a measurement of the number of hydrogen ions (i.e. protons) in a substance. The pH scale was created in 1923 by scientist Peter Lauritz Srensen. (1868-1969).
The pH of a solution is a key marker of its chemical makeup. The pH can have an impact on the biological processes that take place, the behavior of bacteria, and the behavior of chemicals.
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Tep 3: determine the stereochemistry of the precursors. How is stereochemistry of the starting materials affected in the suzuki reaction? select the correct statements. Stereochemistry of the vinyl boronic acid will be retained stereochemistry of the vinyl halide will be inverted. Stereochemistry of the vinyl halide will be retained stereochemistry of the vinyl boronic acid will be inverted
Stereochemistry of the vinyl boronic acid will be retained and Stereochemistry of the vinyl halide will be retained is how the stereochemistry of the starting materials affected in the Suzuki reaction.
Some compounds have two stereogenic centers or more. Whether or whether those centers are equivalent determines the stereochemistry that results. Similar sets of substituents are present in equivalent sterogenic centers.
There are 2n stereoisomers for n nonequivalent centers. These isomers include certain pairings of enantiomers. These stereoisomers are mirror images of each other because each center of them has the opposite arrangement. Diastereomers are all other stereoisomers.
The answer's solution is included as an image.
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The tendency of an atom to pull electrons toward itself is referred to as its _____. ionic potential tonicity covalency electronegativity polarity
Electronegativity
The tendency of an atom to pull electrons towards itself is called electronegativity.
It is the tendency of an atom to attract bonding pair of electrons towards itself. These atoms which are more electronegative are able to bear a negative charge and be stable.
Unlike electropositive elements which tend to lose electrons , electronegative elements hold on tightly to the electrons.
The electronegativity is measured using the Pauling Scale where the most electronegative element of the periodic table, Fluorine , is given a value of 4 and the rest of the elements have values lower than 4 according to the trends followed by their groups and periods.
The least electronegative element of the periodic table , Cesium has a value of 0.7 on the Pauling Scale.
Electronegativity increases when we move from left to right in the periodic table and it decreases (in general) when we move down the group.
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Question 6 of 10
Which statements about velocity are true?
Check all that apply.
A. The symbol for velocity is .
B. For velocity, you must have a number, a unit, and a direction.
C. To calculate velocity, divide the change in the distance by time.
D. The SI units of velocity are m/s.
Answer:
A, C And B
Explanation:
mark me brainlest
Answer:
A.✅(maybe)
B.✅
C.✅
D.✅
Explanation:
For A. if the symbol is given then answer can be determined. If symbol is V then it's true, if other then false
Urn the gas off immediately if the flame sputters, flares, or goes out, or if you ________________________ gas.
Urn the gas off immediately if the flame sputters, flares, or goes out, or if you smell gas.
If something which includes an engine or a flame sputters, it really works or burns in an uneven way and makes a chain of soft popping sounds.
What reasons a gasoline burner to sputter?
if your gasoline burner is hissing, sputtering, or burning a yellow flame, it isn't always running successfully. The problem is due to an excessive amount of or too little air being supplied to the flame. here is a way to make an adjustment: Wait to carry out your repair until the stovetop floor is cool
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Most body water intake is from __________, whereas most body water lost is via __________.
Most body water intake is from drinking, whereas most body water lost is via ; urine.
Where is most of the water of the body found ?
Most body water is found within the extracellular fluid. the 2 major forces that result in the movement of water are fluid pressure and osmotic pressure. In ECF , the main cation is potassium, and therefore the major anions are chloride and bicarbonate.
How does water get distributed within the body?
The water we drink is absorbed by the intestines, and circulated throughout the body within the form of body fluids such as blood. These perform various functions that keep us alive. They deliver oxygen and nutrients to the cells, and remove waste materials, which are then eliminated with urination.
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An oxygen molecule at 25◦C has a speed of
about 678 meters per second. Express this
speed in miles/hour. (1 mi = 5280 ft)
1. 0.000659 miles/hour
2. 0.421 miles/hour
3. 0.000117 miles/hour
4. 2440000 miles/hour
5. 9780 miles/hour
6. 15200 miles/hour
7. 1520 miles/hour
An oxygen molecule at 25◦C has a speed of 1520 miles/hour.
Equation :As we know
1 km = 1000 meter
So,
678 / 1000 = 0.678 km
And 1 mile = 1.6 km
So,
0.678 / 1.609 = 0.4213 miles
We know that 1 hour = 60×60 = 3600 sec
So,
1 sec = 1 / 3600
= 2.777 x 10⁻⁴ hour
Now finding speed,
speed = distance / time
speed = 0.4213 / 2.777 x 10⁻⁴
speed = 1520 miles/hour
What is speed ?Velocity is the rate and direction of an object's movement, whereas speed is the time rate at which an object is moving along a path. In other words velocity is a vector value, whereas speed is a scalar value.
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When 7.02 grams of a compound containing only carbon and hydrogen was burned completely in 25.5 grams of oxygen, 21.0 grams of carbon dioxide and water were formed. what mass of water was formed?
Mass of water is 11.52 grams.
Overall chemical equation for reaction of combustion a compound containing only carbon and hydrogen:
CxHy + O₂ → xCO₂ + y/2H₂O
m(CxHy) = 7.02 g; mass of the compound
m(O₂) = 25.5 g; mass of oxygen
m(CO₂) = 21.0 g; mass of carbon dioxide
m(H₂O) = ?; mass of water
Conservation of matter states that the mass of the reactants have to be equal to the mass of the products.
m(CxHy) + m(O₂) = m(CO₂) + m(H₂O)
7.02 g + 25.5 g = 21.0 g + m(H₂O)
m(H₂O) = 32.52 g - 21.0 g
m(H₂O) = 11.52 g; mass of water
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what is the smallest unit of length
Answer:
Plank length
Explanation:
The smallest possible size for anything in the universe is the Planck Length, which is 1.6 x10-35 m across.
What reagent or reagents is reuired for the conversion of yclohexene to cycloexane?
Reagents required for conversion of clohexene to cycloexane is H2,Pt.
Functions do reagents serve in chemistry:
A chemical reaction is used to confirm the detection of another substance and is referred to as a "substance or compound that is added to a system in order to bring a chemical reaction or is added to check whether a reaction has occurred or not."
Reagents required for conversion of clohexene to cycloexane is H2,Pt.
Hydrogenation of cyclohexene in presense of Pt catalyst gives cyclohexane .
cyclohexene + H2 -----(Pt)----> cyclohexane .
Pt is acting here as a catalyst.
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The elements br2 and icl have the same number of electrons, yet br2 melts at -7.2 0c and icl melts at 27.2 0c. explain.
The elements Br₂ and ICl have the same number of electrons, yet Br₂ melts at -7.2°C and ICl melts at 27.2°C because Br₂ is a non-polar molecule with dispersion force as intermolecular interaction between them, whereas ICl is a polar molecule with dipole-dipole interactions and dispersion foces as intermolecular interaction.
ICl is with permanent dipole moment as the electronegativities of Cl and I are diffferent from each other.
The melting point of any compound rests on the intermolecular forces' stregth. More energy is required for stronger intermolecular forces so that it can overcome and have a higher melting point.
In Br₂ and ICl, the strength of dispersion force is similar because they have same number of electrons. But ICl have stronger dipole interactios too.
Therefore, strength of intermolecular forces is larger in ICl than in Br₂, so ICl have a high melting point of 27.2°C than Br₂ ( -7.2°C).
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The amount of heat transferred to a system can be measured in _________________.
The amount of heat transferred to a system can be measured in joules and calories
What are joules and calories?
They both function as energy units.
But they stand for various amounts. (As meters and inches are both length units.)
Historically, the specific heat of water was employed to define a calorie.
It is currently accurately specified in joules: 4.184 joules make up 1 calorie.
It is perplexing that 1 calorie equals 1000 calories, or 4,184 joules.
Finally, there are at least seven widely used versions of the calorie, each of which can vary somewhat from 4.184 joules to slightly more or less depending on their prior definition. Wikipedia has much more as usual.
Surprisingly, there are at least two joule variations (modern and international).
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A jet airplane reaches 746. Km/h on a certain flight. What distance does it cover in 10.0 minutes? Set the math up. But don’t do any of it. Just leave your answer as a math expression. Also, be sure your answer includes all the correct unit symbols.
The distance covered by the jet airplane in 10 minutes is 124.582 Km
What is speed?Speed is the distance travelled per unit. Mathematically, it can be expressed as:
Speed = distance / time
With the above formula, we can obtain the distance. Details below
How to determine the distanceThe following data were obtained from the question:
Speed = 746 Km/hTime = 10 minutes = 10 / 60 = 0.167 hourDistance =?Speed = distance / time
Cross multiply
Distance = speed × time
Distance = 746 × 0.167
Distance = 124.582 Km
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An inactive substance used in a controlled experiment to test the effects of an active substance.
Answer:
its placebo it is inactive substance not active like outer drugs which forms bonds with chemicals present in our body
Converting ounces to grams. there are 28.35 grams in an ounce. a pancake recipe calls for 1 lb of flour. how many grams are in 1 lb of flour?
Converting ounces to grams
16 oz (In a pound) * 28.35= 453.6
The pound is the official currency of the United Kingdom and related territories. [4] The pound (symbol: £) is the principal unit of sterling and can be referred to by the compound noun [b] pound sterling or the term British pound, neither of which is the official name of the currency itself. One pound is divided into 100 pence (singular: "penny", abbreviation: "p").
The pound is the unit of currency used in Great Britain. This is represented by the £ symbol. The British pound is divided into 100 pence. Other countries, such as Egypt, also have a currency unit called the pound. A cup of coffee costs £2. A pound is defined as the base unit of weight in the foot-pound-second (F.P.S) system and is equivalent to 16 ounces. An example of pounds is a man who weighs 186 pounds. An example of 1 lb is to buy 3 lbs of lemons. noun. Pound means to strike with force.
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It is economical to use scrap iron to get copper.
Give one reason why.
Answer:
Yes is my final answer
Explanation:
1. Scrap iron is used to displace copper because it is a more reactive, cheaper metal, making it a cost-effective way to produce copper. Scrap or old iron is also easier to obtain, as it is one of the world’s most recycled scrap metals. During a displacement reaction, iron reacts with a copper sulphate solution. This causes the iron ion to displace the copper to form iron sulphate, with solid copper being produced as a result.
A vacuum gage connected to a chamber reads 54 kpa at a location where the atmospheric pressure is 92 kpa. determine the absolute pressure in the chamber.
The absolute pressure in the chamber is 38 kPa.
p(vacuum gauge) = 54 kPa; pressure of vacuum gauge, pressure is below atmospheric pressure, so it is called negative or vacuum gauge pressure
p(atmospheric pressure) = 92 kPa
p(absolute pressure) = ?
p(absolute pressure) = p(vacuum gauge) - p(atmospheric pressure)
p(absolute pressure) = 92 kPa - 54 kPa
p(absolute pressure) = 38 kPa
Atmospheric pressure or barometric pressure is the pressure within the atmosphere of the Earth.
Absolute pressure is the pressure in a vacuum. Absolute pressure uses absolute zero as its zero point.
Vacuum gauge pressure uses atmospheric pressure as its zero point.
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How does the electron configuration of ions derived from representative elements give them stability?
The electron configuration of ions derived by stable arrangement.
What is electron configuration of ions?Their valence shell contains two or eight electrons. They don't acquire, shed, or distribute electrons.
An atom with a full outermost (valence) shell has a stable electrical configuration. The quantity of electrons that leave or enter an atom's outer shell is known as its valency.
A noble gas configuration is a stable electron configuration for representative or main group elements. By acquiring or losing electrons and forming ions, or by sharing electrons with other atoms, the representative elements' atoms can adopt a noble gas structure.
The stability of an electron arrangement can be predicted. When all of an atom's orbitals are filled, it is at its most stable and unreactive. The combinations with full energy levels are the most stable.
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What is reduced and what is oxidized in the reaction between a monosaccharide and a ferric ion?
In the reaction between a monosaccharide and a ferric ion, The carbonyl carbon is oxidized to a carboxyl group, the cupric ion is reduced.
Chemical reactions often involve color changes, temperature changes, gas evolution, or precipitate formation. Simple examples of everyday reactions are digestion, combustion, and cooking. The definition of reaction is a reaction. An example of a reaction is someone stopping their car at a stop sign. noun. response to stimuli.
The five basic types of chemical reactions are combination, decomposition, single exchange, double exchange, and combustion. By analyzing the reactants and products of a particular reaction, we can classify them into one of these categories. Some responses fit into multiple categories. It is modeled after the old Italian reaction, the French response, derived from the medieval Latin response (nominative to react). It is a noun of action formed in Late Latin from the past participle stem of the Latin reader.
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If 16% of the nucleotides in one strand of a dna molecule contain the base g, what percent of the nucleotides on the complementary strand will also contain the base g?
If 16% of the nucleotides in one strand of a DNA molecule contain the base g, what percent of the nucleotides on the complementary strand will also contain the base g but it is impossible to determine from the information given.
DNA double helix. The hydrogen bonds are damaged and the helix is opened. Each strand of DNA acts as a template for synthesizing a brand new complementary strand. During replication, equal DNA double helices are formed, every with a brand new strand and a vintage strand.
Also, cytosine (C) enhances guanine (G) and adenine (A) enhances thymine (T). Therefore, the complementary strand for 5'-TAGAC 3' is 3'-ATTCG 5', similar to alternative c.
His Chargaff's discovery of A = T and C = G, combined with a few very essential X-ray crystallographic research through British researchers Rosalind Franklin and Maurice Wilkins, Watson Contributed to Crick's derivation of his 3-D double helix model. DNA structure.
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A unknown compound was found to have the molecular formula c5h12o2 . to which compound classes could the compound belong? check all the apply. the possible functional groups are:
The compound classes are alcohol (hydroxyl group) and ether (ether group).
A unknown compound was found to have the molecular formula C₅H₁₂O₂.
Degree of unsaturation = (2C + 2 + N - X - H) / 2
Degree of unsaturation = (2 × 5 + 2 + 0 - 0 - 1) / 2
Degree of unsaturation = 0
C = number of carbon
H = number of hydrogen
N = number of nitrogen
X = number of halogen
The degree of unsaturation is 0, a unknow compound has only single bond.
Alcohols and ethers have single bonds and oxygen in their structure.
In the pictures below, there are examples of alcohol with two hydroxyl group (-OH) and ether with two ether groups.
It cannot be carboxylic acid, because acid has double bon.
It cannot be phenol, because it must have minimum six carbon atoms.
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