I'm pretty sure its D because if it's manufactured and distributed its likely not toxin or poison. a narcotic could be a controlled substance so that's why I'm leaning towards D
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
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 ppmIn 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
(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 will you describe the difference between heat and temperature?
Answer:
Heat: It is a form of internal energy* obtained because of the random motion and the attractive force of molecules within the substance.
Temperature: It is a quantity that determine which direction the heat energy will flow in.
Explanation:
How many moles of lithium fluoride (LiF) are in a 8.5 g sample?
How many moles of oxygen are needed to react with 3.24 moles of ammonia?
Answer:
12 mol
Explanation:
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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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.
How many moles are in 568 grams of Gold?
Pls help me I will give you 10 points
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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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.
When your grandparents were growing up, they ate
mostly foods grown or produced near them. Describe how the
food you eat is different from the food your grandparents ate
as a result of science’s impact on agriculture and transportation
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 .
List 3 metals that could replace lead in the compound Pb(NO3)2 in a single replacement reaction.
Answer:
AKWIJKNZQSOKQPALQALQPALALQLLKILILI
which gas is used in flying balloons ?
Answer:
hydrogen
Explanation:
can i have brainliest please
What is the formula for Silver (I) chloride?
Answer:
AgCl formula for silver(l) chloride
What is weather?
a
The atmospheric conditions over many days, weeks, months, and years.
b
The atmospheric conditions for a particular moment in time.
c
The atmospheric conditions forecasted for the next season.
What volume would 4.32x1023 atoms of Krypton gas occupy at STP?
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.
Oxygen 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!
The number of atoms is 4g Mg (mass number =24 ?
The number of atoms in Mg wpuld be one atom
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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Water (3010 g ) is heated until it just begins to boil. If the water absorbs 5.79x105 J of heat in the
process, what was the initial temperature of the water?
Answer:
54 °C
Explanation:
Step 1: Given and required data
Mass of water (m): 3010 gHeat absorbed (Q): 5.79 × 10⁵ JSpecific heat of water (c): 4.184 J/g.°CInitial temperature (T₁): ?Final temperature (T₂): 100 °C (Boiling point of water)Step 2: Calculate the initial temperature of water
We will use the following expression.
Q = c × m × (T₂ - T₁)
5.79 × 10⁵ J = 4.184 J/g.°C × 3010 g × (100 °C - T₁)
T₁ = 54 °C
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
A bowling ball and basketball collide, what direction do they go and how is energy transferred?
Answer:
When the batter hits the ball, there is a force applied, and energy is transferred. The ball will move in the direction the force is pushing it. If two objects collide, energy will be transferred between both, and there will be a change in motion.
Explanation:
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!
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.
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.