The maximum level of lead allowed in drinking water is 15 mg/kg. What is this concentration in units of parts per million?
Lead is a heavy metal that is present in drinking water in specific small amounts. The maximum amount of lead allowed in drinking water in parts per million is 15 ppm. Thus, option A is correct.
What are parts per million?Parts per million (ppm) is the unit of expressing the mass of the substance with respect to the volume of the solution. It is generally used to represent the concentration of the contaminants or chemicals.
Given,
Mass of lead (Pb) = 15 mg
Volume/mass of water = 1 kilogram
The concentration of lead is calculated as,
Mass of Lead x 10⁶ ÷ Mass of water
=15 × 10⁶ ÷ 1000000
= 15 mg/kg
As it is known that 1 ppm = 1 mg/Kg
So, 15 mg/kg = 15 ppm
Therefore, option A. the maximum level of lead allowed in drinking water is 15 ppm.
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Your question is incomplete, but most probably your full question was, The maximum level of lead allowed in drinking water is 15 mg/kg. What is this concentration in units of parts per million?
15 ppm1.5 × 10⁻² ppm1.5 × 10⁴ ppm3.1 ppmOxygen gas, generated by the reaction 2KClO3 (s) 2KCl(s) 3O2 (g) is collected over water at 27°C in a 1.35-L vessel at a total pressure of 1.00 atm. (The vapor pressure of H2O at 27°C is 26.0 torr.) How many moles of KClO3 were consumed in the reaction?
Answer:
[tex]n_{KClO_3}=0.0353molKClO_3[/tex]
Explanation:
Hello!
In this case, according to the experiment, we first realize that the pressure of oxygen is:
[tex]p_{O_2}=1.00atm-26.0/760 atm=0.966atm[/tex]
Next, we compute the moles based off the ideal gas law:
[tex]PV=nRT\\\\n=\frac{PV}{RT}=\frac{0.966atm*1.35L}{0.08206\frac{atm*L}{mol*K}*300K}=0.0530molO_2[/tex]
Thus, since there is 3:2 mole ratio between oxygen and potassium chlorate, we can compute the consumed moles of the latter as shown below:
[tex]n_{KClO_3}=0.0530molO_2*\frac{2molKClO_3}{3molO_2} \\\\n_{KClO_3}=0.0353molKClO_3[/tex]
Best regards!
You are given a sample of an unknown solution and are tasked with determining the density. The solution is miscible with water, so you cannot use a float test. To complete this task, you begin by obtaining a clean dry beaker and measure its mass on a balance (120.3621 g). You then use a pipet to transfer the liquid into the beaker. The initial reading on your pipet is 4.126 mL and after you have dispensed the liquid the pipet reads 6.518 mL. You then obtain the mass of the beaker with the liquid inside (123.0194 g).
_____g/mL
Answer: 1.11 g/mL
Explanation:
Density = mass/vol
mass 123.0194-120.3621g = 2.6574
vol 6.518-4.126 ml = 2.392
What is the meaning of matter?
Answer:
Explanation:
physical substance in general, as distinct from mind and spirit; (in physics) that which occupies space and possesses rest mass, especially as distinct from energy.
Answer:
Anything that takes up space.
Explanation:
Anything that has both volume and mass.
The number of atoms is 4g Mg (mass number =24 ?
The number of atoms in Mg wpuld be one atom
this woman is riding a bicycle down a hill at a constant speed and in a straight line.
Which change will increase the speed of the bicycle?
A. Added forces of 30 N up the hill and 20 N down the hill
B. Added forces of 30 N up the hill and 30 N down the hill
C. An added force of 20 N down the hill
D. An added force of 20 N to the side of the hill
Answer:
what is your zoom email
teĺlllll
Americium – 242 is a beta emitter. Write an equation for this nuclear reaction and identify the product nucleus.
Answer:
Explanation:
²⁴²₉₅Am ⇒ ₉₆²⁴²Cm + ₋ ₁e .
The product nucleus is Curium .
Explain the following statement from the text: “Magnets exert magnetic force as a result of magnetic field.
Answer:
All magnets have north and south poles. Opposite poles are attracted to each other, while the same poles repel each other. When you rub a piece of iron along a magnet, the north-seeking poles of the atoms in the iron line up in the same direction.
Magnets exert magnetic force as a result of magnetic field attraction between opposite poles and magnetic field repulsion between same poles.
What are magnets?Magnets are the substance in which north and south poles present and they show attraction towards the different poles and repulsion towards the same pole.
Due to presence of this poles magnets have their own magnetic field and direction of this field governs from north to south pole. Due to this magnetic field magnets exert magnetic force towards some metals like iron and show attraction.
Hence, due to presence of different poles in a magnet, they exerts magnetic force.
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Help me please 18-22
Answer:
-4
Explanation:
What volume would 4.32x1023 atoms of Krypton gas occupy at STP?
Could someone help me out with these questions???
1.If an organism has a high biological fitness in one habitat, does it mean it will also have a high biological fitness in a different habitat? Explain.
2.Does natural selection produce a change in individuals or populations?
3.Consider a major environmental change. If there are no organisms in a population that have traits that allow them to continue to reproduce and survive, what would most likely happen to that population?
Answer:
1. If an organism has high biological fitness in one habitat, this does not mean it will have high fitness in another. This is because organisms adapt accordingly to their environment. Therefore, since there is variability among habitats, this does not guarantee that the organism will always have high biological fitness.
2. Natural selection produces changes in populations. Individual organisms are directly impacted by it, as it determines their survival rate, but the only genetic changes would occur in a population.
3. If there are no organisms with varying traits in a population, they will likely go extinct after a major environmental change. This is because natural selection will remove all organisms who are unable to survive in the new environment. If the population does not have the variability to survive this, then they will go extinct.
If an organism has a high biological fitness in one habitat, then it doesn't guarantee a high biological fitness in a different habitat; natural selection does change the individual. The population will go extinct if the individuals can't reproduce.
What is the individual survival chance?The individual that lives in an ecosystem can change itself due to natural selection, as natural selection favors the individuals who can survive in the changing environment, and the change in the environment induces the change in the organism. There is no reproductive success if the organisms are reproductively isolated within the population.
Hence, if an organism has a high biological fitness in one habitat, it doesn't guarantee a high biological fitness in a different habitat; natural selection does change the individual. The population will go extinct if the individuals can't reproduce.
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You are counting red blood cells, which objective will be best to count the number of cells, high power or low power objective and why?
Can someone please HELP MEEEE
Answer:
Low power
Explanation:
Low power would allow for the full image of the red blood cells and would appear as small circles.
List 3 metals that could replace lead in the compound Pb(NO3)2 in a single replacement reaction.
Answer:
AKWIJKNZQSOKQPALQALQPALALQLLKILILI
Which sequence of coefficients will balance the following equation?
Na (s) + O2 (g) → 2Na20 (s).
Answer:
option c. 4,1,2
Explanation:
No. of atoms of each element in reactant is equal to that of products
Please help me I need this really quick
Answer:
Produce CO2 = Both
Produces oxygen = Both
Use CO2 in photosynthesis = Both
Use O2 in cellular respiration = Both
Hope this helps! :)
Please help, it's a task in science and I'm really bad at this subject.
Answer:
1. solid
2. liquid
3. plasma
4. gas
Those are the four parts of matter.
Explanation:
I hope this helps.
When the following molecular equation is balanced using the smallest possible integer coefficients, the values of these coefficients are: sodium chloride (aq) silver nitrate (aq) silver chloride (s) sodium nitrate (aq)
Answer:
1 on each compound there
Explanation:
A balanced reaction is a reaction that has the same number of atoms in the reactants and products. If this number is not the same, we need to balance it putting some numbers as coefficients behind the compound or element that needs to be balanced, For example:
NH₃ ------> N₂ + H₂
As you can see in this reaction, we have 1 nitrogen and 3 hydrogens in the reactants, and in the side of products we have 2 of each element. This needs to be balanced. To do this we put a number as coeffcient to balance the atoms. In this case, we can put a number 2 behind the NH₃, so the number of atoms of nitrogen becomes 2:
2NH₃ ------> N₂ + H₂
But this 2, changes the number of hydrogens, we now have 6 (cause 2 * 3 = 6), so, let's balance hydrogen on the products to be 6, putting a 3:
2NH₃ ------> N₂ + 3H₂
Now, the reaction is balanced in each side of the reaction.
Applying the same principle to the reaction of this exercise we have the following:
NaCl(aq) + AgNO₃(aq) ---------> AgCl(s) + NaNO₃(aq)
As you can see, we have the same number of atoms on each side:
Na: 1; Cl: 1; Ag: 1; N: 1; O: 3
So we don't need to balance this reaction, with just putting the number 1 or none, is perfectly balanced.
Hope this helps
(CH3CH2)2CHCH(CH3)2 Check all that apply. Check all that apply. alkane alkene alkyne cycloalkane cycloalkene cycloalkyne aromatic hydrocarbon
Answer:
Alkane
Explanation:
Alkane is a class of organic compounds that contain only carbon and hydrogen and the carbon atoms are connected to each other by single bonds.
Now, if we look at the molecule whose condensed structural formula is shown in the question, we will notice that the compound can only contain single bonds. That is, the molecule is a saturated hydrocarbon(alkane).
I have drawn out the full structure of the compound to illustrate this point.
How many grams of propane, C3H8, are needed to make 140 grams of water?
Answer:
85.6 g
Explanation:
Step 1: Write the balanced combustion equation
C₃H₈ + 5 O₂ ⇒ 3 CO₂ + 4 H₂O
Step 2: Calculate the moles corresponding to 140 g of H₂O
The molar mass of H₂O is 18.02 g/mol.
140 g × 1 mol/18.02 g = 7.77 mol
Step 3: Calculate the moles of C₃H₈ needed to produce 7.77 moles of H₂O
The molar ratio of C₃H₈ to H₂O is 1:4. The moles of C₃H₈ needed are 1/4 × 7.77 mol = 1.94 mol.
Step 4: Calculate the mass corresponding to 1.94 moles of C₃H₈
The molar mass of C₃H₈ is 44.10 g/mol.
1.94 mol × 44.10 g/mol = 85.6 g
PLEASE HELP !!!! This is a models of chemistry question
Answer:
The 2.8 hrs one i think???
hope this helps
Explanation:
Which of the following is not a type of thematic map? Help please
Answer:
Option c is the answer....
Do you think genetic engineering is ethical? Explain why or why not.
Answer:
Yes
Explanation:
One of the top goals of genetic engineering is the improvement of health. Imagine a world without the threat of AIDS or cancer. Those working in the genetics field hope that manipulating the genes of humans will one day enable science to prevent people from contracting these potentially deadly diseases.
A 18.5 gram sample of metal was added to a graduated cylinder that had
an initial volume of 45.50 mL. The water level raised to 54.10 mL. Using
this information, calculate the density of the metal. *
Answer:
[tex]d=2.15g/mL[/tex]
Explanation:
Hello there!
In this case, since the density of the metal is computed as shown below:
[tex]d=\frac{m}{V}[/tex]
We need to calculate the volume of the solid by subtracting the final volume and the initial volume of water:
[tex]V=54.10mL-45.50mL\\\\V=8.60mL[/tex]
Thus, we obtain:
[tex]d=\frac{18.5g}{8.60mL}\\\\d=2.15g/mL[/tex]
Best regards!
If you had 4.8 x 10^23 molecules of butane, how many moles would this amount represent? (SHOW ALL WORK FOR BRAINLIEST)
Answer:
The mole is simply a very large number that is used by chemists as a unit of measurement.
Explanation:
The mole is simply a very large number,
6.022
×
10
23
, that has a special property. If I have
6.022
×
10
23
hydrogen atoms, I have a mass of 1 gram of hydrogen atoms . If I have
6.022
×
10
23
H
2
molecules, I have a mass of 2 gram of hydrogen molecules. If I have
6.022
×
10
23
C
atoms, I have (approximately!) 12 grams.
The mole is thus the link between the micro world of atoms and molecules, and the macro world of grams and litres, the which we can easily measure by mass or volume. The masses for a mole of each element are given on the periodic table as the atomic weight. So, if have 12 g of
C
, I know, fairly precisely, how many atoms of carbon I have. Given this quantity, I know how many molecules of
O
2
are required to react with the
C
, which I could measure by mass or by volume.
What is the mass of 4.76 moles of lithium phosphate
Answer:
The mass of 4.76 moles lithium phosphate is 551.16 grams.
Explanation:
Given that,
Number of moles, n = 4.76
We need to find the mass of 4.76 moles of lithium phosphate.
The chemical formula of lithium phosphate is Li₃PO₄.
Mass of Li₃PO₄ will be :
Li₃PO₄ = 3(6.941) + 30.97+4(16)
= 115.79 g/mol
The number of moles is given by :
[tex]n=\dfrac{m}{M}\\\\m=n\times M\\\\m=4.76\times 115.79\\\\m=551.16\ g[/tex]
So, the mass of 4.76 moles lithium phosphate is 551.16 grams.
What is the formula for Silver (I) chloride?
Answer:
AgCl formula for silver(l) chloride
How many moles are in 568 grams of Gold?
In a graph, what effect would adding a catalyst have on D?
A. It would decrease.
B. It would increase.
C. It would stay the same.
D. You cannot tell from this graph.
Answer:
C. It would stay the same
Explanation:
PLATO answer
Which of the following best describes the outcome of the cell division process meoisis?
Select one:
A. Meosis does not occur in reproductive cells.
B. The cells produced at the end of meiosis are genetically identical to the parent cell.
C. The cells produced at the end of meiosis contain half the number of chromosomes as the parent cell.
D. Cells only divide once during meiosis.
Answer:
Explanation: The answer is B. Because meiosis process produce genetically different, haploid cells. Also, meiosis basically happen to produce gametes. Gametes is haploid. So, the answer is B
Meiosis is a method for cell division taking place in some organisms. In meiosis the cell the cells produced at the end of meiosis contain half the number of chromosomes as the parent cell. Hence, option C is correct.
What is meiosis?meiosis is biological process by which the cell undergo division to produce genetically identical daughter cells. Other methods of cell divisions include mitosis, binary division, budding etc.
The first stage of meiosis includes pairing homologous chromosomes and they segregate to opposite ends of the meiotic spindle.This phase is known as reduction division where, the number of chromosome reduces to half.
This differentiated chromatids separates out in the second phase and yielding the haploid cells. Hence, in meiosis, the cells produced at the end of meiosis contain half the number of chromosomes as the parent cell.
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Which statement explains whether NaCl or BeO will have a stronger bond?
a
BeO will have a stronger bond because it has a larger ionic charge, and a smaller distance between ions.
b
NaCl will have a stronger bond because it has a smaller ionic charge, and a larger distance between ions.
c
NaCl will have a stronger bond because it has a smaller ionic charge, and a smaller distance between ions.
d
BeO will have a stronger bond because it has a smaller ionic charge, and a smaller distance between ions.
Answer:
C
Explanation:
The statement that explains whether NaCl or BeO will have a stronger bond is D. BeO will have a stronger bond because it has a smaller ionic charge, and a smaller distance between ions
A chemical bond simply means the attraction between ions, atoms, or molecules which then leads to the formation of chemical compounds.
It should be noted that Beryllium oxide with the chemical formula BeO has a stronger bond than Sodium Chloride due to the fact that it has a smaller ionic charge, and a smaller distance between ions
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