"Calculate the volume, in mL. of the 1.0 M NaOH stock solution needed to prepare 250 mL of 0.1 molar NaOH."
You need 25 mL of the 1.0 M NaOH stock solution to prepare 250 mL of 0.1 M NaOH.
Explanation:To calculate the volume of the 1.0 M NaOH stock solution needed to prepare 250 mL of 0.1 M NaOH, we need to apply the formula for dilution: M1V1 = M2V2. Here, M = molarity, V = volume, 1 refers to the initial condition (stock solution), and 2 refers to the final condition (prepared solution).
Applying the known values to the formula, we get: (1.0 M) * V1 = (0.1 M) * (250 mL). Thus, V1 (volume of the stock solution needed) = 25 mL.
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Which best describes a similarity between power plants that use water as an energy source and those that’s use wind as an energy source
what is the energy of a photon of green light with a frequency of 5.80 x 10^14/s
We have that for the Question "what is the energy of a photon of green light with a frequency of 5.80 x 10^14/s" it can be said that the energy of a photon of green light with a frequency of 5.80 x 10^14/s is
[tex]E=3.8454*10^{-19}[/tex]
From the question we are told
what is the energy of a photon of green light with a frequency of 5.80 x 10^14/s
Generally the equation for the energy of a photon is mathematically given as
[tex]E=hf\\\\Therefore\\\\E=hf\\\\E=6.63*10^{-34}* 5.80 x 10^{14}\\\\[/tex]
[tex]E=3.8454*10^{-19}[/tex]
Therefore
the energy of a photon of green light with a frequency of 5.80 x 10^14/s is
[tex]E=3.8454*10^{-19}[/tex]
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Isotopes of the same element have different _____.
A. Positions on the periodic table
B. Chemical behavior
C. Atomic numbers
D. Mass numbers
Isotopes of the same element differ in their mass numbers due to varying numbers of neutrons, while their chemical properties remain the same since they have identical numbers of protons and electrons.
Explanation:Isotopes of the same element have different mass numbers. This is because although isotopes have the same number of protons, and therefore the same atomic number, they contain different numbers of neutrons. Remember that the mass number (A) is the sum of the numbers of protons and neutrons in the nucleus of an atom. Since neutrons add to the mass but do not change the chemical properties, isotopes typically exhibit identical chemical behavior.
The difference in neutron count is why isotopes have varying atomic masses. For example, Chlorine-35 has 18 neutrons and Chlorine-37 has 20 neutrons, but both have the same atomic number as they both contain 17 protons. Instead of affecting chemical reactivity, this variance influences the atomic weight of the element as it appears on the periodic table.
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Explain the collision theory, in your own words, and what is necessary for a collision to be successful
how do you know if a reaction is exothermic?
Part
a. the mass of khc8h4o4 is measured to the nearest milligram; however, the volume of water in which it is dissolved is never of concern water is even added to the wall of the erlenmeyer flask during the titration. explain why water added to the khc8h4o4 has no effect on the data, whereas water added to the naoh solution may drastically affect the data.
Water added to khc8h4o4 has no effect on data, while water added to NaOH solution can drastically affect data.
Explanation:When water is added to khc8h4o4 (potassium hydrogen phthalate), it has no effect on the data because khc8h4o4 is insoluble in water. Therefore, adding water to it does not change its mass or affect the titration process. On the other hand, when water is added to the NaOH solution, it can drastically affect the data because NaOH is a strong base that can dissolve in water and alter the concentration. Adding water to the NaOH solution increases the volume of the solution and dilutes it, leading to inaccurate data.
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A 26.6 g sample of aluminum at 100.4 °C is added to 100.6 g of water at 21.5 °C in a constant pressure calorimeter. What is the final temperature of the water in °C? The specific heat capacity of aluminum is 0.903 J/goC.
If the pressure, volume, and temperature of a gas are known, which can most likely be found by using the ideal gas law?
the molar amount of the gas
the partial pressure of the gas
the standard temperature and pressure
the molar mass
Answer : The correct option is, the molar amount of the gas.
Explanation :
Ideal gas law : In this law, the pressure, temperature, volume and moles of gas are related to each other by the simple formula.
The ideal gas equation is,
[tex]PV=nRT[/tex]
where,
P = pressure of the gas
V = volume of the gas
T = temperature of the gas
n = number of moles of gas or molar amount of gas
R = Gas constant
According to the question, If the pressure, volume, and temperature of a gas are known then the molar amount of the gas can be found by using the ideal gas law.
Hence, the correct option is, the molar amount of the gas.
We have that, given the gas law (PV=nRT), Pressure ,Volume and Temperature we find [tex]n=\frac{PV}{RT}[/tex].
The molar amount of the gas is most likely be found, given the Ideal gas law equation.
Option A.
Ideal gas lawGenerally the equation for the ideal gas is mathematically given as
PV=nRT
P=Pressure
V=Volume
n= the amount of substance of gas(the molar amount of the gas).
R=Gas constant
T=Temperature
This ideally looks at the relationship between the temperature the pressure and Volume of a gas in a system.
Therefore,From the ideal gas equation if the pressure, volume, and temperature of a gas are known, N is given as
[tex]n=\frac{PV}{RT}[/tex]
The molar amount of the gas(Number of moles).
Option A.
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Acetaminophen (pictured) is a popular nonaspirin, "over-the-counter" pain reliever. what is the mass % (calculate to 4 significant figures) of each element in acetaminophen?
Acetaminophen as a chemical formula of C8H9NO2. The molar masses are:
C8H9NO2 = 151.163 g/mol
C = 12 g/mol
H = 1 g/mol
N = 14 g/mol
O = 16 g/mol
TO get the mass percent, simply multiply the molar mass of each elements with the number of the element divide by the molar mass of acetaminophen, that is:
%C = [(12 * 8) / 151.163] * 100% = 63.50%
%H = [(1 * 9) / 151.163] * 100% = 5.954%
%N = [(14 * 1) / 151.163] * 100% = 9.262%
%O = [(16 * 2) / 151.163] * 100% = 21.17%
Using alcohols as solvents offers the advantage of using ro- ions which are somewhat stronger ______ than the hydroxide ion.
What happens when an electron falls to a lower energy level?
Question options:
The electron absorbs energy.
The electron releases energy.
The electron takes on a higher frequency.
If you're in K12, then the answer is "the electron releases energy".
When an electron falls to a lower energy level, the electron releases energy. Thus, the correct option for this question is B.
What are electrons?Electrons may be defined as the type of sub-atomic particles that are continuously revolving around the nucleus of an atom. These sub-atomic particles are typically negatively charged.
This is due to the electrostatic force between the nucleus of the atom and electrons. It leads to the centripetal force on the electrons and makes them to revolve around the nucleus.
It is a principle phenomenon that when an electron falls from a higher energy level to a lower energy level, it accelerates. This is because the energy that is stored in these sub-atomic particles now tends to be released. It also leads to the formation of electromagnetic radiations due to the differences in energy levels.
Therefore, when an electron falls to a lower energy level, the electron releases energy. Thus, the correct option for this question is B.
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Describe how mixtures relate to substances
During the combustion of 5.000 g of octane, C8H18, 239.5 kcal is released. Write a balanced equation for the combustion reaction. Express your answer as a chemical equation with whole number coefficients. Include phases.
The chemical equation for this combustion reaction is:
C8H18 + O2 --> CO2 + H2O
Balancing by adding whole number coefficients:
2 C8H18 + 25 O2 --> 16 CO2 + 18 H2O
Including the phases:
2 C8H18 (l) + 25 O2 (g) --> 16 CO2 (g) + 18 H2O (l)
where g is gas and l is liquid
subatomic particles has a mass of 1.7 x 10-27 kg
What would you expect to happen to the air pressure as a storm approaches? Question 7 options: A. It would increase B.It would decrease C.It would remain the same
Which term labels solution?
Something used to represent a complex idea or process in science is a
1 program
2 microscope
3 hypothesis
4 model
it is 4 i did this exam 3 is wrong
the answer is
D
A model
Is the alien theory a scientific claim? Why or why not?
Answer:The alien theory is not a scientific claim because it is not based on valid data, there is no evidence to support it, and it does not come from a reliable source.
Explanation:
it was correct i did it today
Mass is measured against a standard using a _____. graduated cylinder burette balance calorimeter
Answer : The correct option is, Balance.
Explanation :
Mass is measured against a standard using a balance.
Volume is measured against a standard using a graduated cylinder, burette.
The amount of heat produced or absorbed in the chemical reaction is measured against a standard using a calorimeter.
Hence, the mass is measured against a standard using a balance.
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A cruise ship makes its way from one island to another. The ship is in motion compared with which reference point?
the passengers on the ship
the captain of the ship
a lighthouse on a nearby island
the cargo inside the hull of the ship
Answer:
a lighthouse on a nearby island
Explanation:
The ships passengers are moving at the same velocity as the ship therefore according to their reference point the ship is not moving. The same is true with the captain and the cargo inside the hull of the ship. But from a light house , which has a different velocity as the ship, the ship is moving.
To help you understand, look at a person sat next to you in the car, does it look like that person is moving? No, because you have the same velocity as them. Now look outside at the ground, it looks like it is moving because you have different velocities.
What is the chemical formula for the compound formed between magnesium and selenium?
The chemical formula for the compound formed between magnesium and selenium is MgSe. This result occurs because magnesium loses 2 electrons and selenium gains 2 electrons form an ionic bond.
Explanation:The chemical formula for the compound formed between magnesium and selenium is MgSe. Magnesium (Mg) is a group 2 element and therefore has 2 valence electrons that it wants to lose in order to achieve a stable full outer electron shell. Selenium (Se), a group 16 element, needs 2 more electrons to achieve the same stability. Thus, when magnesium and selenium form an ionic bond, the magnesium atom transfers its 2 electrons to selenium, creating a magnesium ion (Mg2+) and a selenium ion (Se2-), which then combine to form the compound MgSe.
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Blood is composed of many tiny cells in a liquid called plasma. Blood is actually considered a colloid. The dispersed state of matter is , and the dispersion medium is .
Fruit jelly is mostly juice, but it doesn’t run all over the place even if you cut a piece and put it on a plate. This is because the juice is contained within the structure of a natural substance called pectin, which can hold its shape on its own at room temperature. The dispersed state of matter is , and the dispersion medium is .
Answer:
solid liquid liquid solid
In the colloid blood, the dispersed state of matter is the blood cells and the dispersion medium is plasma. Similarly, in fruit jelly, juice is the dispersed state of matter and pectin is the dispersion medium.
Explanation:In a colloid, like blood and fruit jelly, there are two parts: the dispersed state of matter and the dispersion medium. In the case of blood, the dispersed state of matter is the blood cells (both red and white blood cells) and the dispersion medium is plasma. This means that the blood cells (solid phase) are distributed throughout the plasma (liquid phase).
For fruit jelly, the dispersed state of matter is the juice and the dispersion medium is pectin. This means that the juice (liquid phase) is distributed throughout the pectin (solid phase). So, pectin acts as a stabilizing structure that holds the juice in place, even at room temperature.
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Similarity between all mixtures and compounds is that both what
If a mixture contains 75% of one compound and 25% of its enantiomer what is the
e.e
Final answer:
The enantiomeric excess (ee) of a mixture containing 75% of one compound and 25% of its enantiomer is 50%, calculated using the formula [(% more abundant enantiomer - 50) × 100] / 50.
Explanation:
If a mixture contains 75% of one compound and 25% of its enantiomer, the enantiomeric excess (ee) can be calculated using the formula: ee = [(% more abundant enantiomer - 50) × 100] / 50. In this scenario, the mixture consists of 75% of one enantiomer and 25% of its counterpart. To calculate the enantiomeric excess, you subtract 50 from the percentage of the more abundant enantiomer, which is 75%, and then multiply by 100, and divide the result by 50.
Therefore, the ee = [(75-50) × 100] / 50 = [(25 × 100) / 50] = 50%. This means that the mixture has a 50% enantiomeric excess of the more abundant enantiomer.
Calculate the nuclear binding energy for 5525mn in megaelectronvolts per nucleon (mev/nucleon).
Binding energy per nucleon for 5525mn is 8.95 MeV/nucleon. The nuclear binding energy for a nuclide like 55²25Mn can be found by determining the mass defect from experimental mass and calculated mass of nucleons. Multiplying the mass defect by the conversion factor of 931 MeV/amu gives the total binding energy, which when divided by the number of nucleons, yields the binding energy per nucleon.
To calculate the nuclear binding energy for 5525Mn, we need to know the experimental mass of the nuclide and use the mass defect to find the total nuclear binding energy, which can then be divided by the number of nucleons to get the binding energy per nucleon. First, please find the experimental mass of 5525Mn in atomic mass units (amu) from the provided Table or credible sources. The mass defect is the difference between the sum of the individual masses of protons and neutrons and the actual mass of the nucleus.
Once the mass defect (Δm) is determined, we multiply it by the mass-energy equivalence conversion factor of 931 MeV/amu to get the total binding energy (E) in megaelectronvolts (MeV). The formula is:
E = Δm x 931 MeV/amu
To find the binding energy per nucleon, simply divide the total binding energy by the number of nucleons (A). The formula is:
Binding energy per nucleon = E / A
For instance, if the mass defect for 5525Mn turns out to be 0.528462 amu, the total binding energy would be:
E = 0.528462 amu x 931 MeV/amu = 492 MeV
And the binding energy per nucleon would be:
Binding energy per nucleon = 492 MeV / 55 nucleons = 8.95 MeV/nucleon
Binding energy per nucleon for 5525mn is 8.95 MeV/nucleon.
How many liters are in 2.751 ounces? Use the conversion factor: 1 liter = 33.814 ounces Rounded to the result to the correct number of significant figures. Express your answer in scientific notation. Format your answer using the following template to earn credit: "XXX.XXXX x 10^-+XX units" Replace the X's with digits, as necessary Replace "units" with the correct unit abbreviation Replace "-+" with either "+" or "-", as necessary
The activation energy for the reaction no2(g)+co(g)⟶no(g)+co2(g) is ea = 100 kj/mol and the change in enthalpy for the reaction is δh = -375 kj/mol . what is the activation energy for the reverse reaction? express your answer with the appropriate units.
jellyfish, mushrooms, oak trees, and bacteria contain cells. Which component of cell theory does this best illustrate?
A. all living things are made of cells
B. Most organisms are made of cells
C. All cells come from other cells
D.plants are made of cells
It is A because in the introduction it talked about how Matthias Schleiden and Theodor Schwann determined that all living things are made of cells (so any living organic organism) However, many other scientists like Rudolf Virchow contribute to the theory.
The jellyfish, mushrooms, oak trees, and bacteria contain cells. The component of cell theory does this best illustrate all living things are made of cells. Therefore, option A is correct.
What do you mean by the cell theory ?According to the cell theory, cells make up every biological entity; they are the basic building block of life, and all life originates from earlier forms of life.
Nowadays, the cell idea has become one of the guiding concepts of biology due to its widespread acceptance.
The unicellular and multicellular organisms that have a full, distinct cellular structure with cell organelles, make energy by burning food, and reproduce include bacteria, algae, and fungus. All therefore fall within the category of living things and the cell idea.
Thus, option A is correct.
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How many moles of glycerin (C3H5(OH)3) are consumed in this reaction?
14KMnO4 + 4C3H5(OH)3 es001-1.jpg 7K2CO3 + 7Mn2O3 + 5CO2 + 16H2O
Ans: 0.709 moles glycerin
The given reaction is:
14KMnO4 + 4C3H5(OH)3 → 7K2CO3 + 7Mn2O3 + 5CO2 + 16H2O
a) Based on the reaction stoichiometry:
5 moles of CO2 requires 14 moles of KMnO4
Therefore, 0.886 moles of CO2 would correspond to:
= 0.886 moles CO2 * 14 moles KMnO4/5 moles CO2
= 2.48 moles
b) Again from the reaction stoichiometry:
5 moles of CO2 requires 4 moles of glycerin
therefore, 0.886 moles of CO2 would consume:
= 0.886 moles CO2 * 4 moles glycerin/5 moles CO2
= 0.709 moles
Answer:
2.48 0.709
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