What is the legal limit?
The lowest concentration that can officially be reported for any constituent in drinking water is known as the "Legal Limit".
Contamination of water:
The level that safeguards human health and that water systems can attain with the finest technology is reflected in the regulatory limit for a contaminant.
How does it occur:
Plumbing components are the main way that lead and copper enters the drinking water. The health effects of lead and copper exposure can range from brain damage to stomach discomfort.Nitrogen, bleach, salts, pesticides, metals, bacterial toxins, and human or animal medications are examples of chemical pollutants. Organisms in the water are biological pollutants. Other names for them include microorganisms and microbiological pollutants.In order to control corrosion, the system must take a variety of additional measures if lead concentrations reach an action threshold of 15 ppb or copper concentrations exceed an action level of 1.3 ppm in more than 10% of measured customer taps.
Learn more about the contamination of water here,
https://brainly.com/question/7910855
#SPJ4
How many moles of Ar gas are
present in a container with a
volume of 78.4 L at STP?
1 mole of a gas at STP occupies 22.4 L volume
Now the volume is given =78.4 therefore,
No. of moles of gas = 78.4 ÷ 22.4 = 3.5 moles
I hope it helps you~
pls help mee with this question i will mark you as the brainliest
Answer:
1 2 1 2
2 1 1 2
2 1 3
2 3 3 1 3
Explanation:
How can the effect of radiation on healthy cells be reduced when treating cancer?
A. Splitting the radiation into multiple treatments.
B. Using metal plating to absorb excess radiation.
C. Using less damaging alpha radiation.
D. There is no way to reduce the negative side effects.
An effective way of reducing effects of radiation treatment on healthy cells is by splitting the radiation into multiple treatments; option A.
What is the effective way of reducing side effects of radiation?The side effects of radiation treatment include damage to healthy cells.
This damage is can cause physical effects such as lowered immune system.
The best way to reduce this effect could be done by splitting the radiation into multiple treatments.
Therefore, radiation treatment produces undesirable effects such as damage to healthy cells.
Learn more about radiation treatment at: https://brainly.com/question/16943640
#SPJ1
Which pair of elements has the most similar Lewis structures?
Group of answer choices
a)O and S
b)N and S
c)F and Ar
d)Cl and Ar
Answer: C.)
Explanation:
Can someone help me please?
Answer:
3 moles Al2O3
Explanation:
See attached image.
A radioactive substance has a half-life of 5 million years. What is the age of a rock in which 25% of the original radioactive atoms remain? You must show your work or explain how you came up with your answer for full credit.
Answer:
10 million years
Explanation:
For a sample to decay to 25% of its original amount, 2 half lives must have passed. Since one half life is 5 million years, multiplying this by 2 gives us that 2 half lives is 10 million years.
Someone pls help fast
it is desired to inflate a baggie with a volume of 869 milliliters by filling it with oxygen gas at a
pressure of 0.505 atm and a temperature of 287 k. how many grams of o2 gas are needed?
0.592 grams of O₂ gas are needed.
What is Ideal Gas ?An ideal gas is a gas that obeys gas laws at all temperature and pressure conditions. It have velocity and mass but do not have volume. Ideal gas is also called perfect gas.
Ideal gas law equation is expressed as:
PV = nRT
where,
P = Pressure
V = Volume (in Liters)
n = Number of moles of gas
R = Ideal gas constant
T = Temperature
Here,
P = 0.505 atm
V = 869 ml = 0.869 L
R = 0.0821 L atm/K mol [Ideal gas constant]
T = 287 K
Now put the values in above equation
PV = nRT
0.505 atm × 0.869 L = n × 0.0821 L atm/K mol × 287 K
0.438 atm L = n × 23.56 L atm / mol
[tex]n = \frac{0.438\ \text{atm L}}{23.56\ \text{L atm / mol}}[/tex]
n = 0.0185 mol
Now,
Mass of oxygen = Number of moles × Molar Mass
= 0.0185 mol × 32 g/mol
= 0.592 gram
Thus from the above conclusion we can say that 0.592 grams of O₂ gas are needed.
Learn more about the Ideal Gas here: https://brainly.com/question/20348074
#SPJ1
what made alchemy unscientific in its practices
The answer is that they were were not based on evidence and experiment and that made alchemy unscientific in its practices.
Alchemy is an old practice that might be thought of as a forerunner of chemistry.
The term alchemy is derived from the Arabic al-kimiyya, which is derived from Greek. Alchemy's fundamental notions focus around the transformation of one substance into another, often transforming a basic metal like lead or iron into a "noble" metal like silver or gold
The alchemist's main ambitions were to find the Stone of Knowledge, the medium of Eternal Youth and Health, and metal transmutation.
To conclude with we can say Alchemy is based on magic and occultism rather than true investigation and facts. Many of the items in it have been utilised as fundamentals for certain chemistry, although the vast majority of them are wrong and inaccurate.
Learn more about alchemy here:
https://brainly.com/question/5997100
#SPJ10
3. 2KOH + H2SO4 = K2SO4 + 2H2O what chemical reaction is it.
1. Single displacement
2. Double displacement
3. synthesis
4. Decompostion
The combustion of glucose, c6 h12 o6 (s), produces carbon dioxide, co2 (g), and water, h2 o(g), according to the equation below. upper c subscript 6 upper h subscript 12 upper o subscript 6 (s) plus 6 upper o subscript 2 (g) right arrow 6 upper c upper o subscript 2 (g) plus 6 upper h subscript 2 upper o (l). the enthalpy of the reaction is –2,840 kj. what is the heat of combustion, per mole, of glucose?
The heat of combustion per mol of the glucose is 2840 kJ.
A reaction that involves the burning of a compound in the presence of air or oxygen is called combustion. In the absence of oxygen combustion of a compound cannot take place.
It is given that the combustion of glucose produces carbon dioxide and water. The balanced chemical reaction for the given process is expressed as:
C6H12O6 (s) + 6O2 (g) ------> 6CO2 (g) + 6H2O (l)
The energy released from this reaction is -2840 kJ. The above equation clearly shows that 1 mol of glucose is used during the reaction and the energy produced is -2840 kJ.
Therefore, the heat of combustion per mol of the glucose is 2840 kJ.
Learn more about combustion here:
https://brainly.com/question/13096727
#SPJ4
what is the force that holds atoms together
Explanation:
Chemical bond refers to the forces holding atoms together to form molecules and solids. This force is of an electric nature, and the attraction between electrons of one atom to the nucleus of another atom contributes to what is known as chemical bonds.
Ions in solution are found in a hydration shell of water. This shell must be removed for an ion to pass through the channel. How does the K channel accomplish removal of the water from the shell around the ion
The K+ channel uses the energy in ATP hydrolysis to remove the hydration shell from the K+ion
All of this truly implies is that one of these bonds breaks in a hydrolysis process (a water-mediated breakdown reaction), releasing a sizable amount of energy.
The following reaction results in the hydrolysis of ATP to ADP:
ATP+H2O⇋ADP+Pi+energy
The hydrolysis of ATP to ADP is reversible, like the majority of chemical processes.
Energy is needed for the reverse process, which creates ATP from ADP and Pitext P iPi start subscript, P, end subscript, start subscript, I end subscript.
Because cells frequently use (hydrolyze) ATP molecules and depend on constant production of replacement ATP, ATP regeneration is crucial1^1.
Hence the K+ channel uses the energy in ATP hydrolysis to remove the hydration shell from the K+ion
Learn more about hydrolysis here:
https://brainly.com/question/4352413
#SPJ4
Assume that you are provided with a 20-cm Hempel column having HETP of 10 cm to distill a mixture of 90 mol% toluene and the rest is benzene. What would be the composition of the first distillate you obtained
Column height is 20cm, and HETP is 10cm.
So this column will behave as 20/10=2 ideal trays.
Hence the distillate composition will be 45%benzene.
Chem 233 Islam AboalnadieSeparation of Liquids by Fractional Distillation and Analysis by Gas ChromatographyBackground and Methods: The purpose of this lab was to use the techniques of fractional distillation to separate a 1:1 mixture of Ethyl acetate and Butyl acetate then use gas chromatography to analyze the amount of each compound in each of three fractions obtained through the distillation. Fractional distillation will then be compared to simple distillation.
The first fraction was taken when the distillation apparatus was near the boiling point of Ethyl acetate (77.1ºC) (1). The second was taken when the distillation apparatus was in the process of increasing temperature from the boiling point of Ethyl acetate to the boiling point of Butyl acetate (126.1ºC) (1). The third and final fraction was taken around the boiling point of Butyl acetate until the distillation process was complete.
Please check the attached diagram for a more detailed answer.
10%benzene solution be separated as 2 timelines in txy diagram.
Learn more about benzene at
https://brainly.com/question/6028840
#SPJ4
How many moles of oxygen are produced by decomposing 28.5 g of dihydrogen dioxide
(molar mass = 34.0 g/mol) according to the equation: 2H2O2(l) —> 2H2O(l) + O2(g)
Answer:
0.419 mol O₂
Explanation:
just took test
Which Anion is this?:
CO2 – 3
(a) Nitrate
(b) Carbonate
(c) Nitrite
(d) Sulphate
Answer:
Carbonate
Explanation:
Carbonate is a combination of a carbon atom and two oxygen atoms for form a compound.
How many colvant bonds can a typical carbon atom form
[tex]\huge\purple{Hi!}[/tex]
carbon atom can form four covalent bonds.
Describing nuclear fission and fusion which applies to fusion? check all that apply. involves the splitting of nuclei takes place in the sun releases radiation as a waste product occurs in nuclear power plants and is used to generate electricity plays a role in the production of essentially all elements heavier than helium releases large amounts of energy
Which holds true for nuclear fission? Check all that apply.
Involves the splitting of nucleiReleases large amount of energyReleases radiation as a waste productOccurs in nuclear power plants and is used to generate electricityWhich holds true for nuclear fusion? Check all that apply.
Takes place in the sunPlays a key role in the production of essentially all elements heavier than heliumReleases large amounts of energyWhat is nuclear fission?
An unstable nucleus splitting into two smaller, more stable nuclei is known as nuclear fission. Large amounts of energy are released during this process since a smaller nucleus's structure requires a lot less energy to maintain. This mechanism is exploited by turning the thermal energy released into electrical energy.
What is nuclear fusion?
The alternative is nuclear fusion. It entails joining two smaller, less stable nuclei into one larger, more stable nucleus. The sun is where this process takes place because it needs so much energy. Moreover, a tremendous amount of energy is released. Helium, a two-proton element, is the smallest element that can be created using this procedure. The smallest element has one proton (H).
Learn more about nuclear fission here,
https://brainly.com/question/913303
#SPJ4
Answer:
A B D E
Explanation:
Edge 2023
The constituents of leaf pigment can be separated by:
Answer:
Paper Chromatography
Explanation:
Most leaves are green due to chlorophyll pigments of different types like chlorophyll A, chlorophyll B, etc. All these pigments will be seperated according to their molecular composition. So, the correct option is 'Paper Chromatography'.
what is electron arrangement of phosphorus atom?
Answer:
[Ne] 3s² 3p³
Explanation:
this is the answer and give me likes and vote for me
An electric field travels away from a charge and toward a _?_ charge.
An electric field travels away from a positive charge and toward a negative charge.
What is electric field?
Electric field is the region of space where the impact of electric force is felt.
The electrostatic field is always directed away from positive charges and toward negative charges, and, field lines must go away from positive charges and toward negative ones.
Thus, an electric field travels away from a positive charge and toward a negative charge.
Learn more about electric field here: https://brainly.com/question/14372859
#SPJ1
Which of the following is true about nuclear power?
A It is the cheapest source of energy.
B It produces harmful radiation.
C It pollutes the atmosphere.
D It uses fossil fuels.
Please help me :')
Answer:
I thinks is B
Explanation:
they just look harmful
I also researched and it says its harmful and causes sickness and death
Iodine-131 has a half-life of 8 days. If you start with a sample of 150 grams, how much of the original isotope will remain after 30 days?
The amount of the original isotope that remains after 30 days is 11.14.
What is the half life?
The half life of a radioactive nuclide has to do with the time that it takes for only half of the original number of nuclides to remain.
Now;
No = 150 grams
N = ?
t1/2 = 8 days
t = 30 days
Then;
N/No = (1/2)^t/t1/2
N/150 = (1/2)^30/8
N/150 = (1/2)^3.75
N = (1/2)^3.75 * 150
N = 11.14
Learn more about half life:https://brainly.com/question/24710827
#SPJ1
Given the half-life, the amount remaining is 11.14 g
What is the amount of Iodine-131 remaining after 30 days?The half-life of idine-131 is 8 days.
Using the half-life formula:
Nt = No * (0.5)^(t/t1/2)
Amount remaining = 150 * (05)^(30/8)
Amount remaining = 11.14 g
In conclusion, the amount remaining is determined from the half-life of the substance.
Learn more about half-life at: https://brainly.com/question/2320811
#SPJ1
What is the pH of a solution with a
POH of 2.1?
Answer:
11.9
Explanation:
ph=poh-14 and vice versa. Always subtract by 14
What is the correct electron configuration of phosphorus (P)?
O A. 1s22s²2p³3s²3p³
B. 1s²2s²2p 3s²3p³
O C. 1s²2s²2p62d5
OD. 1s²2s22p63s¹3p4
Answer:
A
Explanation:
Phosphorus has an electron configuration of 1s2 2s2 2p6 3s2 3p3. Another way to write that is [Ne] 3s2 3p3. The [Ne] represents the fact that the beginning of phosphorus' electron configuration is the same as Neon's. so if you add all the superscripts they will give you 15. we didn't use choice d because we have to make the last p halffilled(3, half of the total electron held in p shell ) when we make "s shell 1 " not make it 4 because we are transfering that 1 electron .but nevertheless the correct answer is A.
The measurement of Uric acid in 24-hour urine samples requires a specific sample collection procedure, part of which is the refrigeration of the sample. Refrigeration will:
Refrigeration will prevent bacterial growth which may result in uricase production and breakdown of uric acid in the sample.
What is uricase ?
An enzyme called uricase is responsible for catalyzing the change of uric acid into allantoin. Your body excretes uric acid, an acidic waste product, through urine. It is a typical result of the digestion of purine-rich meals.
Only media containing uric acid, allantoin, or allantoate as the primary or only source of carbon, nitrogen, and energy support the growth of the bacteria Bacillus fastidious. Raw extract of cells cultivated on uric acid had significant amounts of uricase.
Alcaligenes eutrophus, Pseudomonas aeruginosa, and Micrococcus denitrificans all displayed increased uricase activity after being placed in conditions containing uric acid, according to Kaltwasser. The ability of microorganisms to degrade uric acid and to use it for growth is an inducible property of various bacteria. Uricases of Bacillus fastidious and of Aspergillus nidulans were reported to be induced by uric acid.
Learn more about uricase here:
brainly.com/question/9332755
#SPJ4
The hormone epinephrine is released in the human body during stress and increases the body's metabolic rate. Epinephrine, like many biochemical compounds, is composed of carbon, hydrogen, oxygen, and nitrogen. The percentage composition of the hormone is 59.0% C, 7.15% H, 26.2% O, and 7.65% N. Determine the empirical formula.
Answer:
C9 H13 N O3
Explanation:
Carbon mole wt = 12
59 /12 = 4.917
Hydrogen mole wt = 1
7.15 / 1 = 7.15
Oxygen mole wt = 16
26.2 / 16 = 1.6375
Nitrogen mole wt = 14
7.65 / 14 = .5464
Now divide the numbers by the smallest found
Carbon 4.917 / .5464 = 9
Hydrogen 7.15 / .5464 = 13
Oxygen 1.6375 / 3
Nitrogen .5464 /.5464 =1 emp form C9 H13 O3 N
Which is an issue that governments must consider before passing conservation policies?
Issues that should be taken into account:
"Urbanization implications" are the issues that governments must consider before passing conservation policies.
Conservation policies:
It is a policy intended to preserve or restore a community, ecosystem, endangered species, or a natural or semi-natural environment.
Protecting the planet's natural resources for the benefit of present and future generations is known as conservation.
Urbanizations implications:
Deforestation, habitat loss, and freshwater extraction are all frequent effects of urbanization, which can reduce biodiversity and change the ranges and interactions of various species.Overall, urbanization resulted in reductions of 2.6% carbon sequestration, 1.1% natural habitat, 6% soil conservation, and 3.4 % water retention. Compared to other types of environmental loss, urbanization has a longer-lasting effect. Thus the government must consider this issue while passing conservation policies.Learn more about the urbanizations implications here,
https://brainly.com/question/26946165
#SPJ4
What will be the total energy shared between an electron and positron, that have been created through pair production from a 10 MeV photon
Answer:
The total energy that an electron and positron share is 5 Mev
Explanation:
One of the potential ways that gamma rays interact with matter is by the formation of positron-electron pairs.
The pair production requires a minimum gamma-energy of 1.02 MeV since an electron's rest mass is equal to 0.511 MeV of energy. The electron-positron pair receives any extra kinetic energy from the pair-producing gamma ray.
The reaction is represented by γ =(. - 1e⁰) + (. + 1e⁰)
E = m₀C² + [tex]KE_{electron}[/tex] + m₀C² + [tex]KE_{positron}[/tex]
10 MeV = 2m₀C² + [tex]KE_{electron}[/tex] + [tex]KE_{positron}[/tex]
[ 2m₀C²= 1.02 ] and since the mass of electron and positron is the same, the Kinetic energy (KE), 1/2 mv² will also be the same
Therefore,
KE = 1/2(10 - 1.02)
=4.49 MeV
[ 2m₀C²= 1.02 so, m₀C² = 1.02/ 2 = 0.51]
Total energy shared = m₀C² + KE
= 0.51 + 4.49
= 5 Mev
Learn more about the total energy of an electron and positron here
https://brainly.com/question/1615969
#SPJ4
CH3CHOHCH3 an electrolyte in solution.
The complete statement is "CH3CHOHCH3 is not an electrolyte in solution." This is further explained below.
What is electrolyte ?Generally,a liquid or gel containing ions that may be broken down by electrolysis, such as the kind used in batteries.
In conclusion, "CH3CHOHCH3 is not an electrolyte in solution," is the whole sentence.
Read more about electrolyte
https://brainly.com/question/14566383
#SPJ1
Consider the reaction, CS2(l)+3O2(g)→CO2(g)+2SO2(g) . The rate of change of CS2(g) is – 0.012 M/s . What is the rate of change of SO2(g) ?
The rate of change of [tex]SO_2[/tex](g)=0.024M/s when the rate of change of [tex]CS_2(g)[/tex] is – 0.012 M/s.
What is the rate of reaction?Reaction rate, in chemistry, is the speed at which a chemical reaction proceeds.
[tex]CS_2(l)+3O_2(g)[/tex] → [tex]CO_2(g)+2SO_2(g)[/tex]
[tex]Rate = \frac{-dcs_2}{dt} =\frac{-do_2}{dt} =\frac{+dco_2}{dt} =\frac{1dso_2}{dt}[/tex]
Rate = \frac{-dcs_2}{dt} =\frac{-do_2}{dt} =\frac{+dco_2}{dt} =\frac{1dso_2}{dt}
Given:
[tex]\frac{-dcs_2}{dt} =-0.012 M/s[/tex]
[tex]\frac{-dcs_2}{dt} =\frac{dso_2}{dt}[/tex]
[tex]\frac{dso_2}{dt}=0.024M/s[/tex]
The rate of change of [tex]SO_2[/tex](g)=0.024M/s
Hence, the rate of change of [tex]SO_2[/tex](g)=0.024M/s
Learn more about the rate of change here:
https://brainly.com/question/13103052
#SPJ1