Answer:
Molarity I believe
how many millimoles of solid naoh must be added to 50.0 milliliters of 0.20 molar hocl to obtain a buffewr solution that has a ph of 7.49
The amount of millimoles of solid naoh that must be added to 50.0 milliliters is: 5.0 mmol of NaOH.
Millimoles of solid naohThe [H+] at pH 7.49 is:
[H+] = 10–^7.49
[H+]= 3.24×10–^8 M
And when the solution is half-neutralized pH will be:
pH = pKa while [OCl– ]÷[HOCl] = 1
Now let find the millimoles of solid naoh:
0.20 mol HOCl÷1 L× 50.0 mL
= 10.0 mmol HOCl
Half of 10.0 mmol HOCl will be added
Millimoles of solid naoh=10.0 mmol HOCl÷2
Millimoles of solid naoh= 5.0 mmol of NaOH
Inconclusion the amount of millimoles of solid naoh that must be added to 50.0 milliliters is: 5.0 mmol of NaOH.
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an ionized calcium atom has a charge of 2 elementary charges. if this ion is accelerated through a potential difference of 2.0 x 10^3 volts, the ion's change in kinetic energy will be
The ion's change in kinetic energy will be [tex]4.0 \times 10^3\;eV[/tex]
Given the following data:
Charge = 2 Coulombs.
Potential difference = [tex]2.0 \times 10^3 \;Volts[/tex]
How to calculate the ion's change in kinetic energy.Mathematically, kinetic energy of a charge is given by this formula:
[tex]K.E = qV[/tex]
Where:
K.E is the kinetic energy.q is the charge.V is the potential difference.Substituting the given parameters into the formula, we have;
[tex]K.E = 2 \times 2.0 \times 10^3 \\\\K.E = 4.0 \times 10^3\;eV[/tex]
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Pleaseee help me with this
Answer:
The correct answer should be (A) 100%.
Explanation:
Since both the bull & the cow are hom0zygous (meaning they each have two identical alleles in their genes) and the black bull possesses the dominant gene, we can assume that our Punnett square should look like the model I attached below. Since "Bb" would contribute to the percentage of black-colored offspring, and all of the squares end up with "Bb", that means that 4 out every 4 offspring will be dark in color. Or, put more simply, the percentage of the offspring that will be black in color is 100%.
In the expression 3CO2, the numbers 3 is known as _______
Answer:
The number is known as 3 carbon molecules followed by 2 oxygen molecules. This is because on the periodic table, the letter C means carbon, and O2 means oxygen.
When the following equation is balanced:
Al + NiSO4 ® Al2(SO4)3 + Ni
the correct set of coefficients would be:
Answer:
2Al + 3NiSO4 -> Al2(SO4)3 + 3Ni
Explanation:
You just had to balance the equation by looking at Al2(SO4)3. It helps to pick the right coefficients for other components.
The correct set of coefficients for the balanced equation is: 2, 3, 1, 3.
When balancing the equation: 2Al + 3NiSO₄ → Al₂(SO₄)₃ + 3Ni .The coefficients indicate the number of each compound or element required for the equation to be balanced. In this case, the equation is balanced by ensuring that the number of atoms of each element is the same on both sides of the equation.
By placing the coefficients 2 and 3 in front of Al and NiSO₄, respectively, it ensures that there are an equal number of aluminum and nickel atoms on both sides. Additionally, the coefficient 3 in front of Ni and Al₂(SO₄)₃ ensures an equal number of nickel and sulfate groups.
Balancing equations is important because it follows the principle of conservation of mass, ensuring that no atoms are gained or lost during a chemical reaction. The set of coefficients chosen allows for the equation to meet this principle and maintain a balanced representation of the chemical reaction.
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How could you prepare 250 mL of 0.20 M NaCl using only a solution of 1.0 M NaCl and water?
Answer:
As a result, to prepare 250 ml of 0.20M NaCl, take 50 ml of 1.0M NaCl solution and add 200 ml of water.
Explanation:
help!
If both waves have the same sign (either positive or negative), then ___________ interference will occur when the two waves overlap.
A. Negative
B. Constructive
C. Positive
D. Destructive
The color of coral depends on ______.
increased diversity of coral polyp species
ocean water pollution
coastal land development silt run
off damage from scuba diving, boating, and fishing
Answer:
Hello I didi this quiz and i got 100% and the answer is (a) hope this helps <3
Explanation:
Is combining water and powdered drink mix a chemical reaction?
Answer:
No, it's a physical reaction.
Explanation:
A chemical change produces new chemical compounds, but combining water and powder is just mixing the powder with the water. It's not a new compound.
I don't know how to really explain, sorry :)
How does this change the gravitational force between the two objects?
Answer:
The gravitational pull of the moon is probably changing how our atmosphere is.
Explanation:
A projectile moves horizontally with ____?____motion
HELP PLEASE
Answer:
hi
Explanation:
hi
Some power plants burn coal to produce electricity the energy released from the cold being burned is used to change water into steam steam spinach turbines of large generators that produce electricity which energy transformations occur when coal is used to produce electricity
Answer:
When coal is used to produce electricity , the heat energy is transformed into mechanical energy .
Explanation:
Coal is one of the United States' most affordable and largest domestically produced energy sources. It is used to generate a significant quantity of our electricity, about 37%. Historically, producing power from coal has been correlated with a wide range of environmental impacts.
Water is converted into steam at a coal-fired steam plant, much like a nuclear plant, which in turn powers turbine generators to generate electricity. Here is how it operates in the process.
Heat is produced -: It is pulverized to the fineness of talcum powder until the coal is burnt. It is then combined with hot air and blown into the boiler's firebox. The coal / air mixture provides the most full combustion and optimum heat necessary for suspension burning.Water transforms to vapor -: The heat turns highly purified water, pumped through pipes inside the boiler, into steam. The steam is piped to the turbine, reaching temperatures of up to 1,000 degrees Fahrenheit and pressures of up to 3,500 pounds per square inch. The Engine Transforms Steam -: The turbine shaft is rotated by the immense stress of the steam pressing against a pair of giant blades. The turbine shaft is attached to the generator shaft, where magnets spin to generate electricity within wire coils.Steam switches back to water -: The steam is drawn into a large chamber in the basement of the power plant after doing its job in the turbine. Millions of gallons of cool water from a nearby source (such as a river or lake) are pumped through a network of tubes that pass through the condenser in this significant stage. In the tubes, the cool water turns the steam back into water that can be used in the plant over and over again.Without any pollution, the cooling water is returned to its source and the steam water is returned to the boiler to repeat the cycle.
Hence, the heat energy is transformed to the mechanical energy ,when coal is used to produce electricity.
What features of this model will help Armando answer the question?
Answer:
Explanation:
Answer to Armando is an artist who sells prints of his original paintings. ... This problem has been solved! ... Armando wants to create a function P(x). to model his total profit where x is the number of paintings sold
hello people ~
Which of the following does show an oxidation reaction?
(a) Gain of oxygen
(b) Loss of oxygen
(c) Gain of hydrogen
(d) None of the above
Answer:
Loss of oxygen
Explanation:
Shortcut defination of oxidation and reduction
Oxidation=LEO(Loss of Electron)Reduction=GEO(Gain of Electron)The bond line formula,
represents the molecular formula
B
A
C8H18
C8H15
Answer:
C8H18
Explanation:
What do the elements within a "period" have in common?
The number of atomic orbitals is the same for all elements in a period. Every element in the top row (the first period), for example, has only one orbital for its electrons. The electrons of all the elements in the second row (second period) have two orbitals. Every row adds an orbital as you progress down the table.
I hope this helps <3
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A man runs 100 meters in 19 seconds. Find the velocity of man.
Plz help me to solve this problem
Answer:
[tex]\boxed {\tt 5.26315789 \ m/s}[/tex]
Explanation:
One way to find velocity is by dividing the distance by the time.
[tex]v=\frac{d}{t}[/tex]
The distance traveled by the man is 100 meters.
The time is 19 seconds.
[tex]d=100 \ m \\t= 19 \ s[/tex]
[tex]v=\frac{100 \ m}{19 \ s}[/tex]
Divide.
[tex]v=5.26315789 \ m/s[/tex]
The man's velocity is 5.26315789 meters per second.
What is the volume of an unknown object that has a mass of 5.0 g and density of 4.5 g/mL ?
Can somebody plz answer a.b.c (just make it 1 sentence for each)
Not too difficult (WILL MARK AS BRAINLIEST/COMMENT/FOLLOW/
:D Thx guys.
Answer:
One sentence that can be written for evidence is:
Fossils. Fossils document the existence of now-extinct past species that are related to present-day species.
please balance the equation i really need it quick 50 points and marked brainliest answer
Answer:
2C3H8S +13O2 =6CO2 +8H20 +2SO3
Answer:
get from (4,1) to (2,9) go up 8 and over 2 left (-2) - (4 - 2, 1 + 8), do this again (2 - 2, 9+8) and end up at (0,17) which is the y how do you change 7x+3y=3 into slope intercept form.
get from (4,1) to (2,9) go up 8 and over 2 left (-2) - (4 - 2, 1 + 8), do this again (2 - 2, 9+8) and end up at (0,17) which is the y how do you change 7x+3y=3 into slope intercept form.
get from (4,1) to (2,9) go up 8 and over 2 left (-2) - (4 - 2, 1 + 8), do this again (2 - 2, 9+8) and end up at (0,17) which is the y how do you change 7x+3y=3 into slope intercept form.
get from (4,1) to (2,9) go up 8 and over 2 left (-2) - (4 - 2, 1 + 8), do this again (2 - 2, 9+8) and end up at (0,17) which is the y how do you change 7x+3y=3 into slope intercept form.
A reversible process is one that ________
[A] must be carried out at high temperature
[B] must be carried out at low temperature
[C] happens spontaneously
[D] can be reversed with no net change in either system or surroundings
[E] is spontaneous in both directions
Answer:
[D]can be reversed with no net change in either system or surroundings
A reversible process is one that can be reversed with no net change in either system or surroundings. Therefore, option (D) is correct.
What are reversible reactions?A thermodynamic process can be reversible if the process can be turned back to both the system and the surroundings to return to their original states, with no other change in the universe.
No such processes as reversible processes can exist and these processes can easily be defined as idealizations or models of real processes.
A few examples of Reversible Processes: are the extension of springs, slow adiabatic compression or expansion of gases, electrolysis, the frictionless motion of solid, slow isothermal compression or expansion of gases
An irreversible process is a process in which the system and the surroundings do not return to their actual condition once the process is initiated. Examples of irreversible processes are Heat transfer, Diffusion, and electricity flow through a resistance.
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What is the potential energy of a molecule?
A. Energy gained form heating the molecule
B. Energy stored in molecular bonds
C. Energy lost as heat to the surroundings
D. Energy of motion during collisions
Answer:
I guess the answer is D point
Answer:
B. Energy stored in molecular bonds
2 N2 + 5 02- 2 N2O5
What mass of nitrogen is required to react with 5. 04 grams of oxygen?
The mass of nitrogen, N₂ required to react with 5.04 grams of oxygen O₂ is 1.76 grams
Balanced equation2N₂ + 5O₂ —> 2N₂O₅
Molar mass of N₂ = 2 × 14 = 28 g/mol
Mass of N₂ from the balanced equation = 2 × 28 = 56 g
Molar mass of O₂ = 2 × 16 = 32 g/mol
Mass of O₂ from the balanced equation = 5 × 32 = 160 g
SUMMARY
From the balanced equation above,
160 g of O₂ reacted with 56 g of N₂
How to determine the mass of N₂ requiredFrom the balanced equation above,
160 g of O₂ reacted with 56 g of N₂
Therefore,
5.04 g of O₂ will react with = (5.04 × 56) / 160 = 1.76 g of N₂
Thus, 1.76 g of N₂ is needed for the reaction
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Essential Question: How will the weight of a grape change if you put it in cold and room temperature water? Can someone please help me come up with a claim for my Essential question?
Answer:
bc the water molecules freeze
what's thermodynamics? explain in brief.
Answer:
study of the relations between heat, work, temperature, and energy
Explanation:
Thermodynamics is the study of the relations between heat, work, temperature, and energy. The laws of thermodynamics describe how the energy in a system changes and whether the system can perform useful work on its surroundings.
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Assertion: Acrylic fibres are used in making socks and shawls.
Reason: Acrylic fibres are a replacement or woolen fibres.
A. Both assertion and reason are true and the reason is the correct explanation of assertion.
B. Both assertion and reason are true but the reason is not correct for the assertion.
C. The assertion is true but the reason is false.
D. The assertion is false but the reason is true.
Answer:
Both A and R are true and R is the correct explanation of A
Explanation:
Acrylic fibres are similar like Silk and woolsThis is also called synthetic woolSo used in socks and shawls alike woolB. How do the stars' radii compare with their mass?
Answer:
Answer: The radii of main-sequence stars increases as mass increases. Main Sequence stars? Answer: Giants have larger radii compared to main-sequence stars of the same luminosity.
Explanation:
Identify the products of the complete combustion of methane. ............................................................... and ...............................................................
carbon(iv) oxide and water.
Trisha works for a roofing company and needs to move
shingles from the ground to the roof.
What simple machine would help her move the shingles?
Answer: Pulley or a crane.
Explanation:
Answer:
An inclined plane would have to be too long, and a lever would be impractical. Pulleys are best used to raise objects.
Explanation:
Tell whether it is an example of an element or a compound. Write the word element if the sample shows characteristics of an element and compound if it shows Characteristic of compound
________11. Aluminum
_________12. Mercury
________13. Ferrous Sulfate
_________14. Sucrose
__________15. Carbon
Answer:
Element- Aluminum
Element - Mercury
Compound - Ferrous Sulfate
Compound - Sucrose
Element - Carbon
Explanation:
Element: an element is a pure substance which is composed of only one type of atoms and that cannot be split or broken down into any simpler pure substance.
Examples of elements include:
Aluminum - it is composed of only atoms of aluminium. Each atom has 13 protons
Mercury - it is composed of only atoms of mercury. Each atom has 80 protons
Carbon - it is composed of only atoms of carbon. Each atom has 6 protons
Compound: a compound is a pure substance that is composed of two or more types of atoms (elements) in a fixed and definite proportion and that cannot be split into component elements by simple physical methods but only by chemical methods. Examples of compound include:
Ferrous sulphate: It is composed of atoms of Iron, Sulfur and Oxygen
Sucrose: It is composed of atoms of Carbon, Hydrogen and Oxygen.