Answer:
Option A is correct.
Explanation:
Given data:
Mass of ammonia = 1.6 g
Volume of water = 147 mL
Concentration in ppm = ?
Solution:
As we know that,
1 g/mL = 1000000 ppm
1.6 g/147 mL = 0.011 g/mL
Now we will convert the 0.011 g/mL into ppm.
0.011 × 1000000 = 11000 ppm
In scientific notation:
1.1×10⁴ ppm
Thus, option A is correct.
Erioglucine is a blue-colored dye that absorbs its complementary color, red, in aqueous solution around 645 nm. Unfortunately, the local distilled water supply used to make solutions is consistently contaminated with a trace amount of a metal cation that also absorbs 645 nm light. Suppose then, a control sample of 0.0552 M erioglucine (aq) has an absorbance of 0.331 and that a distilled water sample in a similar cuvette has an absorbance of 0.019. Determine the concentration of an erioglucine (aq) sample that has an absorbance of 0.217. 10 pts.
The answer is .0350 but I wanted to see how to get that answer. You have to subtract .019 from the absorbance of the control and the sample
Answer:
For the control experiment: [tex]0.0552 M[/tex] of aqueous solution of erioglaucine has absorbance of [tex]0.035 M\\[/tex]
From Lambert-Beer's law we know:
[tex]Absorbance = e\cdot c \cdot l\\[/tex]
Here; e is the molar absorptivity coefficient of erioglaucine
l = length of cuvette in which the solution is taken = [tex]1 cm[/tex]
A sorbance by the erioglaucine = total absorbance - absorbance by distilled [tex]water = 0.331-0.019 = 0.312[/tex]
So; by putting the values in the above equation; we get:
[tex]0.312 = 0.0552 M \cdot e\cdot~1cm\\[/tex]
So; [tex]e = \frac{0.331}{0.0552} M^{-1}cm^{-1}= 5.65 M^{-1}cm^{-1}[/tex]
The molar absorptivity coefficient of erioglaucine is [tex]5.65 M^{-1}cm^{-1}\\[/tex]
The absorbance of erioglaucine in distilled water (contaminated with metal ions) is: [tex]0 .217[/tex]
The absorbance of distilled water is [tex]0.019[/tex]
So; absorbance of erioglaucine itself is : [tex]0.217-0.019 = 0.198[/tex]
Again using Lambert Beer law; we get:
[tex]A= e\cdot c\cdot l[/tex]
[tex]0.198 = 5.65 M^{-1}cm^{-1} \cdot c \cdot 1 cm[/tex] [tex]( c = concentrartion)[/tex]
c = 0.198/5.65 M = 0.035 M
The concentration of the erioglaucine is [tex]0.035 M\\[/tex]
Explanation:
What kinds of things on earth are made of cells?
Answer:
All living things, large or small, plant or animal, are made up of cells. Most living things are made up of one cell and they are called unicellular organisms. Many other living things are made up of a large number of cells that form a larger plant or animal. These living things are known as multicellular organisms.
Explanation:
The subatomic particle with a mass equivalent to a proton is a
Answer:
neutron .
Explanation:
they both have an approximate mass of 1a.m.u
Can you create or destroy energy?
Answer:
Neither,energy can be changed from one form to another, but it cannot be created or destroyed.
Explanation:
The First Law of Thermodynamics (Conservation) states that energy is always conserved, it cannot be created or destroyed. In essence, energy can be converted from one form into another.
39.866 grams = miligrams
Answer:39866
Explanation:
Multiply mass value by a 1000
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A 2.650 g sample of a gas occupies a volume of 428 mL at
0.9767 atm and 297.3 K. What is its molar mass?
Answer:
Explanation:1. A 2.650-g sample of a gas occupies a volume of 428 mL at 0.9767 atm and 297.3 K. What is its molar mass?
2.
a. A sample of nitrogen gas has a volume of 10.0 L at 2.50atm and 50.0℃. If the pressure is increased to 5.00 atm and the temperature decreases to 25.0℃, what volume does the gas occupy?
(a). 5.00L, (b).4.61L, (c).2.50L, (d).5.42L
b. Using the average bond energy, calculate the enthalpy of the above reaction. draw Lewis structures of the reactants and products first to determine the exact bond order. N2(g)+3H2(g)→2NH3(g)
Given values are:
Volume, V = 428 ml or 0.428 LTemperature, T = 297.3 KPressure, P = 0.9767 atmAs we know the relation,
→ [tex]PV = nRT[/tex]
or,
→ [tex]n = \frac{PV}{RT}[/tex]
By substituting the values, we get
[tex]= \frac{0.9767\times 0.428}{0.0821\times 297.3}[/tex]
[tex]= 0.0171 \ moles[/tex]
hence,
The molar mass will be:
= [tex]\frac{Mass \ of \ gas}{Number \ of \ moles}[/tex]
= [tex]\frac{2.65}{0.0171}[/tex]
= [tex]155 \ g/mol[/tex]
Thus the above answer is right.
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what is necluar force
Answer:
a strong attractive force between nucleons in the atomic nucleus that holds the nucleus together.
Explanation:
Nuclear forces (also known as nuclear interactions or strong forces) are the forces that act between two or more nucleons. They bind protons and neutrons (“nucleons”) into atomic nuclei. The nuclear force is about 10 millions times stronger than the chemical binding that holds atoms together in molecules.Sep 14, 2014
What is the angular momentum of last electron of chromium?
Answer:
expected configuration for Cr is
1s2 2s2 2p6 3s2 3p6 4s2 3d4
but in real, it is
1s2 2s2 2p6 3s2 3p6 4s1 3d5
electron from 4s orbital jumps to 3d orbital to get stable configuration.
so the last electron comes in 3d orbital as filling of 3d takes place after filling of 4s orbital.
Hence,quantum numbers for last electron in Cr is :-
n = 3
l = 2
m = +2
s = +1/2
Explanation:
Balance the following chemical equation by proving the correct coefficients
[ ] Na + [ ] H2O -> [ ] NaOH + [ ] H2
By equalising LHS with RHS,balanced chemical equation is:[2] Na + [2] H2O = [2] NaOH + [1] H2
Balancing is necessary for all chemical equation.The purpose to balance chemical equations are to make both sides of the reaction,reactants and products, equal in the no. of atoms per element.
If Sodium is multiplied by two, the no. of Sodium atoms are in balance.By the process of balancing we can also keep a check on the rightness of the equation.
Sodium hydroxide and Hydrogen gas is product of this reaction.NAOH dissolves in water and contains hydroxide anions(OH-) and sodium cations(Na+).
The balanced equation is 2Na + 2H2O = NaOH + H2
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Who was the first inventor of electric bulb?
a) Edison
b) Joseph
c) Maxim
Thomas Edison is the answer...no a
Describe the function of discs found in between each of your vertebrae
Answer:
These discs absorb the stress and shock the body incurs during movement and prevents the vertebrae from grinding against one another. We can also compare it to glue because basically holds your vertebrates together
What is the overall effect of adding a solute to a solution?
A. The solution freezes and boils at lower temperatures
B.the solution freezes and boils at higher temperatures
C. The solution freezes at a higher temperature and boils at a lower temperature
D. The solution freezes at a lower temperature and boils at a higher temperature
The effect of adding a solute to a solution is:
D. The solution freezes at a lower temperature and boils at a higher temperature
What are the effects of adding a solute to a solution?The edge of boiling over height is the raising of a dissolvable's limit because of the expansion of a solute. Also, the edge of freezing over despondency is the bringing down of a dissolvable's edge of freezing over because of the expansion of a solute. As a matter of fact, as the limit of dissolvable builds, its edge of freezing over diminishes.
Thus, option D is correct.
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4. Long answer type questions: a. b. C. d. e. f. g. h. j. i. What are the constituent gases of air? Why is the surrounding air not seen with the eyes? How do you prove that air supports burning? How do you show that air occupies space? How do you prove that air has weight? How is air useful to us? Mention any three points. Write any three properties of air. How can you say that air exerts force? Write any four effects of air pollution. Write any three causes of air pollution and any two control measures of it.
1. The constituent gases of air are:
Nitrogen Oxygen Argon Carbon Dioxide2. The surrounding air is not seen with the eyes because it is transparent. Air molecules are not visible to the na-ked eye, and they do not scatter or absorb visible light significantly. Therefore, air appears colorless and transparent.
What is air?3. To prove that air supports burning, you can perform an experiment with a burning candle. Place a glass jar or bell jar over a lit candle, ensuring that the jar is airtight. As the candle burns, it consumes oxygen from the air inside the jar. Eventually, the candle flame will go out due to the lack of oxygen, proving that air (specifically oxygen) is necessary for burning.
4. To show that air occupies space, you can perform a simple experiment using a plastic bottle or syringe. Fill the bottle or syringe with water, ensuring there are no air bubbles. Then, cover the opening tightly and try to compress the air inside. You will find that it is not possible to compress the air significantly, indicating that air occupies space.
5. To prove that air has weight, you can use a sensitive balance or scale. Weigh an airtight container or balloon, and then fill it with air. The weight of the container or balloon with the added air will be greater than its initial weight, demonstrating that air has weight.
6. Air is useful to us in various ways. Three points highlighting the importance of air are:
Breathing and RespirationCombustion and Energy ProductionClimate Regulation7. Three properties of air include:
Air is Compressible: Air can be compressed or expanded under different conditions, allowing it to fill various spaces and containers.Air has Mass: Air molecules have mass, which means air itself has weight. It exerts pressure on objects and surfaces.Air Exerts Pressure: Due to the collisions of air molecules with surfaces, air exerts pressure in all directions. This pressure is known as atmospheric pressure.Air exerts force in various ways. For example, air pressure allows objects like airplanes to fly by providing lift. Air resistance or drag opposes the motion of objects moving through the air, creating a force that can affect their speed and trajectory.
8. Four effects of air pollution include:
Respiratory ProblemsEnvironmental Damage:Climate ChangeHuman Health Impacts9. Causes of pollution:
Industrial EmissionsVehicle EmissionsResidential and Agricultural Activities10. Two control measures for air pollution include:
Emission ReductionAir Quality RegulationsLearn more about air on https://brainly.com/question/15215203
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Learning Goal:
To learn the restrictions on each quantum number.
Quantum numbers can be thought of as labels for an electron. Every electron in an atom has a unique set of four quantum numbers.
The principal quantum number n corresponds to the shell in which the electron is located. Thusn can therefore be any integer. For example, an electron in the 2p subshell has a principal quantum number of n=2 because 2p is in the second shell.
The azimuthal or angular momentum quantum number ? corresponds to the subshell in which the electron is located. s subshells are coded as 0, p subshells as 1, d as 2, and f as 3. For example, an electron in the 2p subshell has ?=1. As a rule, ? can have integer values ranging from 0 to n?1.
The magnetic quantum number m?corresponds to the orbital in which the electron is located. Instead of 2px, 2py, and 2pz, the three 2p orbitals can be labeled ?1, 0, and 1, but not necessarily respectively. As a rule, m?can have integer values ranging from ?? to +?.
The spin quantum number ms corresponds to the spin of the electron in the orbital. A value of 1/2 means an "up" spin, whereas ?1/2 means a "down" spin.
Part A
What is the only possible value of m? for an electron in an s orbital?
Express your answer numerically.
Part B
What are the possible values of m? for an electron in a d orbital?
Express your answer numerically with sequential values separated by commas.
Part C
Which of the following set of quantum numbers (ordered n, ?, m?, ms) are possible for an electron in an atom?
Check all that apply.
4, 2, 3, -1/2
-4, 3, 1, 1/2
3, 2, 0, -2
4, 2, -2, 1/2
2, 1, 0, 1/2
3, 4, 0, 1/2
5, 3, 0, 1/2
2, 1, -2, 1/2
Answer:
it 3
Explanation:
How many moles are in 19.6 g of Sodium (Na)? And the conversion factor?
Answer:
n=0.852 moles
Explanation:
Given mass is, m = 19.6 g
The molar mass of sodium is, M = 22.99 u
We need to find the no of moles in 19.6 of Sodium. We know that, no of moles is equal to given mass divided by molar mass.
[tex]n=\dfrac{m}{M}\\\\n=\dfrac{19.6}{22.99}\\\\n=0.852[/tex]
So, there are 0.852 moles in 19.6 g of Sodium.
Aaleyah learned that astronomers use different properties, such as their
brightness, to classify stars. Which other property can scientists use to
classify stars?
A.The size of the star to categorize them in the main sequence.
The apparent magnitude is used to classify the energy of the star.
The star's rotation to calculate the distance from Earth.
O The color to classify the absolute brightness of the star.
Answer:
i need help with that too
Explanation:
Assume that a P orbital is dumbbell shaped the two major lobes in a certain atom contains one electron. In which lobe is electron most likely to be found? Explain, indicating the principle on which the answer is based.
Answer:
See explanation
Explanation:
The p orbital is threefold degenerate. This implies that the p-sublevel is composed of three orbitals; px, py and pz.
According to Hund's rule, electrons occur singly when filling degenerate orbitals before pairing takes place. Since the three orbitals are degenerate, any of px, py or pz may be first filled.
If one lobe of any of the px, py or pz is first filled, the next electron must go into the next degenerate orbital. When all are filled, pairing of electron spins may now begin.
Based on Hund's rule the electron is most like to be found in Px, Py or Pz, and it will fill them singly before paring.
The P-orbital has three sub-orbitals or degenerate orbitals such as Px, Py and Pz which an electron occupy at a time before paring.
The maximum electron in P-orbital is 6 electrons, each degenerate orbital will contain maximum of 2 electrons.
According to Hund's rule, electron will fill the degenerate or sub-orbitals singly first before paring.
Thus, we can conclude that based on Hund's rule the electron is most like to be found in Px, Py or Pz, and it will fill them singly before paring.
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if a student can run 5.5 mph, how long will it take the student to run 3.2 km
Answer: 13.5 minutes to run 3.2 km.
Explanation: To solve this problem, you need to convert the distance from kilometers to miles and the speed from miles per hour to kilometers per hour. 3.2 km is approximately 1.988 miles and 5.5 mph is approximately 8.851 kph. To find the time it takes to run 1.988 miles at 8.851 kph, you can use the formula time = distance ÷ speed. Plugging in the values, you get time = 1.988 miles ÷ 8.851 kph, which simplifies to approximately 0.225 hours or 13.5 minutes.
Therefore, it will take the student approximately 13.5 minutes to run 3.2 km.
How many significant figures does 0.0002 g
Answer:
It has 3 significant figures
Explanation:
When the number ends on zero that are to the right to the decimal point
what is cyclic brane theory? i need a definition.
Explanation:
The cyclic universe theory is a model of cosmic evolution according to which the universe undergoes endless waves of expansion and cooling. It's any of several cosmotoligal models in which the universe follows infinate, indenfinate, self-sustaining practices.
I hope my answer helped you! Have a great day!
A rating and a Thanks would also be great!
Answer:
the cyclic theory is model of comic evolution according to which the univers undergoes endless cycle of expansion and cooling each beging with a bigban and ending in big crunch
**Ariana rides her bike with a constant speed of 10 miles per hour. How far can she travel in 4 hours?
Answer:
40 miles
Explanation:
10 miles per hour means she rides 10 miles eery hour that she rides. 10 x 4 = 40
i need help it is science agian
Answer:
Kepler- created laws of planetary motion
Galileo- discovered moons of Jupiter; published in Italian
Copernicus- revived Aristarchus heliocentric model
Explanation:
I hope this helps you! :)
Let me know if you need help with anything else.
3. This is land surrounded by water on three sides.
A. desert
B. peninsula
C. island
D. swamp
Answer:
The answer is B. peninsula
Explanation:
Answer:
Peninsula
Explanation:
A Peninsula is a large area of land surrounded by water on 3 sides. It is usually larger than a cape
please help this is timed.
What is the total number of complete waves in the graph below
Answer:
2
Explanation:
you go from the middle line where it starts until you hit where it starts the pattern so if you took that shape it and flipped the bottom part it makes a big, complete oval
I hope this helped :))
What is the intensity of a flood
Given that the density of glycerol is 1.261 g/mL, what would be the volume of 20.00 g of glycerol?
Answer:
The answer is
15.86 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\[/tex]
From the question
mass of glycerol = 20 g
density = 1.261 g/mL
The volume is
[tex]volume = \frac{20}{1.261} \\ = 15.86042823...[/tex]
We have the final answer as
15.86 mL
Hope this helps you
How many atoms of he gas are present in a 450 ml container at 35°c and 740 mmhg?
Answer:
To answer this question, we will need to use the gas law which states that:
PV = nRT where:
P is the pressure of the gas = 740 mmHg = 98658.550357 Pascal
V is the volume = 450 ml = 0.45 liters
n is the number of moles that we will calculate
R is the gas constant = 8.314 J/(K. mol)
T is the temperature = 35 celcius = 308 degrees kelvin
Substitute with these values in the above equation to get the number of moles as follows:
98658.550357 * 0.45 = n * 8.314 * 308
n = 17.3375 moles
Each mole contains Avogadro's number of atoms, therefore:
number of atoms = 17.3375 * 6.02 * 10^23 = 1.0437 * 10^25 atoms
. Scientists explore the geosphere by going into deep
How many grams of lead will be produced if 2.54g of PbS is burned with 1.88g of O2? write the equation
If 2.54 g of PbS is burned with 1.88 g of O2, approximately 2.20 grams of Pb will be produced.
The balanced equation for the reaction of lead sulfide (PbS) with oxygen (O2) to produce lead (Pb) and sulfur dioxide (SO2) is as follows:
2PbS + 3O2 -> 2Pb + 2SO2
From the balanced equation, we can see that the stoichiometric ratio between PbS and Pb is 2:2 or 1:1. This means that for every 1 mole of PbS, 1 mole of Pb is produced.
To calculate the number of moles of PbS, we need to divide the given mass (2.54 g) by its molar mass:
Molar mass of PbS = 207.2 g/mol (Pb) + 32.07 g/mol (S) = 239.27 g/mol
Moles of PbS = 2.54 g / 239.27 g/mol = 0.0106 mol
Since the stoichiometric ratio between PbS and Pb is 1:1, the number of moles of Pb produced is also 0.0106 mol.
To calculate the mass of Pb, we multiply the number of moles by its molar mass:
Molar mass of Pb = 207.2 g/mol
Mass of Pb = 0.0106 mol x 207.2 g/mol = 2.20 g
This calculation is based on the stoichiometric ratio between PbS and Pb, where 1 mole of PbS produces 1 mole of Pb. By converting the given mass of PbS to moles and then multiplying by the molar mass of Pb, we can determine the mass of Pb produced.
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Which of these is not a component of ink
Pigment
Teflon
Solvent
Dye
