Sublimation is an effective technique for the isolation of pure caffeine because: The purified caffeine will vaporize and can be collected as a solid, leaving impurities behind.
So, the answer is B.
Sublimation is a chemical technique that is used to isolate the pure form of a substance from impure or mixed form. It is the phase transition of a solid directly to a gas without passing through a liquid phase.
It is an effective technique for the isolation of pure caffeine due to the following reasons:During sublimation, the purified caffeine will vaporize and can be collected as a solid, leaving impurities behind.
The caffeine is heated, and the heat causes the solid to vaporize directly from the solid phase to the gas phase, skipping the liquid phase. Thus, it separates the caffeine from impurities and provides pure caffeine. Therefore, option B is correct.
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determine the molar mass of water. WRITE THE UNITS
When CuCl2 reacts with NaNO3, copper (II) nitrate and sodium chloride are formed.
a) Write the balanced equation for the reaction given above:
CuCl2 + NaNO3 à Cu(NO3)2 + NaCl
Answer:
CuCl2 + 2NaNO3 -------> Cu(NO3)2 + 2NaCl
hope this helps
good day mate
calculate the molar solubility of aluminum hydroxide. al(oh)3. The Ksp = 2.0 x 10-32
The molar solubility of aluminum hydroxide, Al(OH)₃, in a 0.015 M solution of aluminum nitrate, Al(NO₃)₃, is approximately 3.67x10⁻¹¹ M. Option A is correct.
To calculate molar solubility of aluminum hydroxide (Al(OH)₃) in a solution of aluminum nitrate (Al(NO₃)₃), we will consider the common ion effect. Aluminum nitrate is a source of aluminum ions (Al³⁺), which will affect the solubility of aluminum hydroxide.
Balanced equation for the dissociation of aluminum hydroxide will be;
Al(OH)³(s) ⇌ Al³⁺(aq) + 3OH⁻(aq)
In the presence of aluminum nitrate, the aluminum ions from Al(NO₃)₃ will react with the hydroxide ions, reducing the amount of hydroxide ions available for the dissociation of aluminum hydroxide.
Let's assume the molar solubility of aluminum hydroxide in the presence of aluminum nitrate is represented by "s". The concentration of aluminum ions (Al³⁺) from aluminum nitrate is 0.015 M.
The equilibrium expression for the dissociation of aluminum hydroxide is:
Ksp = [Al³⁺][OH⁻]³
Considering the common ion effect, the concentration of hydroxide ions can be expressed as (s - 3x), where "x" represents the decrease in hydroxide ion concentration due to the reaction with aluminum ions.
Substituting the concentrations into the equilibrium expression, we have:
2x10⁻³² = (0.015)(s - 3x)³
Simplifying and neglecting the small contribution of 3x compared to s, the equation becomes;
2x10⁻³² ≈ 0.015s³
To solve for "s," we can rearrange the equation and solve for the cube root:
s ≈ (2x10⁻³² / 0.015[tex])^{(1/3)}[/tex]
Calculating this expression gives us the molar solubility of aluminum hydroxide in the presence of aluminum nitrate;
s ≈ 3.67x10⁻¹¹ M
Hence, A. is the correct option.
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--The given question is incomplete, the complete question is
"Calculate the molar solubility of aluminum hydroxide, Al(OH)₃, in a 0.015M solution of aluminum nitrate, Al(NO₃)₃. The Ksp of Al(OH)₃ is 2x10⁻³² A) 3.67x10⁻¹¹ M B) 5x10⁻⁸ M C) 3x10⁻¹⁵ M D) 7x10⁻¹² M."--
the form of energy that your lunch represents is?
A) electrical
B) chemical
C) thermal
D) nuclear
Which of these are animal adaptations that help animals live in the deciduous forest biome? Select all that apply.
little feet for snow
hibernation
hard outer skin to reduce loss of water
round builds
Answer:
hibernation
hard outer skin to reduce loss of water
Explanation:
I got a few potins for this, but...yeah.
Adaptations that help animals live in the deciduous forest biome hibernation and hard outer skin to reduce loss of water.
What is deciduous forest biomes?A deciduous forest is a type of forest which is dominatred by the trees that lose their leaves seasonally or in the growing season and Earth has dry forests.
Hibernation is a process in which plants or animals adapt themselves in order to survive in the adverse condition to conserve energy. At the same time animals will try to hard their outer skin to reduce the loss of water in the summer season.
Hence correct options are (2) & (3).
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What is the energy change per gram of ice when an iceberg composed of pure water, cp = 2.06 j/(gk, is heated from -25°c to -15°c?
Answer:
[tex]Q=20.6\frac{J}{g}[/tex]
Explanation:
Hello there!
In this case, according to the equation for the calculation of the heat during a heating process:
[tex]Q=mC(T_f-T_i)[/tex]
It is possible to compute it per gram of ice by just removing m from the equation by dividing at both sides. Next we plug in the given specific heat and the final and initial temperatures to obtain:
[tex]Q=2.06\frac{J}{g\°C}[-15\°C-(-25\°C)] \\\\Q=20.6\frac{J}{g}[/tex]
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How would potential energy and kinetic energy change going down stairs one at a time or two at a time?(1 point)
A) Going down stairs two at a time means you will get down in fewer steps, which saves you some kinetic and potential energy.
B) If you go down stairs two at a time, then you are going a greater distance, which will decrease your potential energy. Your kinetic energy will be less when you land on the stair.
C) Going down stairs two at a time will give you twice as much kinetic energy by the time you reach the bottom stair.
D)If you go down stairs two at a time, then your potential energy relative to the stair is greater. Your kinetic energy will be greater when you land.
When going down stairs, choosing to go two steps at a time will result in changes to both potential and kinetic energy. Option B is the correct statement as going down two steps at a time increases the distance traveled, leading to a decrease in potential energy, while the landing impact reduces the kinetic energy.
Option B accurately describes the changes in potential and kinetic energy when going down stairs two steps at a time. As you descend two steps at a time, you cover a greater vertical distance compared to going one step at a time. This increase in distance decreases your potential energy since potential energy is directly related to height. With each step, you experience a decrease in potential energy as you get closer to the ground.
However, when you land on the stair after going down two steps, your kinetic energy is reduced. This is because landing involves a sudden stop and impact, which leads to a dissipation of energy. The energy that was initially in the form of kinetic energy gets transferred to other forms, such as sound or heat. As a result, your overall kinetic energy is reduced compared to going down one step at a time, where each landing impact is less forceful.
Therefore, while the potential energy decreases due to the increased distance traveled, the kinetic energy decreases due to the landing impact when going down stairs two steps at a time.
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Which of the following molecules has a Lewis structure that is not consistent with the octet rule?
A. CFCl3
B. C2F4
C. COF2 (the C is the central atom)
D. XeF2
COF2 has a Lewis structure that is not consistent with the octet rule.
What is the octet rule?The octet rule is a guiding principle in chemistry that represents the notion that elements in the main group of the periodic table tend to form chemical bonds in a way that ensures each atom possesses eight electrons in its outermost electron shell, resembling the electron configuration of a noble gas.
This rule is particularly relevant for carbon, nitrogen, oxygen, and the halogens, although it generally applies to elements found in the s-block and p-block of the periodic table. Other principles govern the behavior of different elements, such as the duplet rule which applies to hydrogen and helium, or the 18-electron rule that pertains to transition metals.
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N2(g) + 2 O2(g) → 2 NO2(g)
Answer: 1.057444301e-018
Explanation:
18) What is the following number representing: 10m/s West *
3 points
Force
Acceleration
Mass
Area
Pressure
Velocity
Speed
Impulse
Momentum
Speed
Explanation:
The distance travelled by a body per unit time
Madison is heating two different liquids. For each liquid, she wants to compare the temperatures at which gas bubbles form, rise, and begin to escape. What physical property is Madison using to compare the liquids?Immersive Reader boiling point conductivity melting point solubility
Answer:
I think its boiling point conductivity
Answer: boiling point
Explanation:
Got it right
true or false enthalpy is defined as the change in heat at constant pressure
True, enthalpy is defined as the change in heat at constant pressure.
The enthalpy change (ΔH) of a reaction is the amount of heat released or absorbed by a chemical reaction at constant pressure. Enthalpy is a state function that is extensively used in the field of thermodynamics.The enthalpy of a system can be calculated by measuring the change in enthalpy (ΔH) between the initial and final states of a reaction. The ΔH value can be positive (endothermic) or negative (exothermic), depending on whether the reaction releases or absorbs heat. For a reaction at constant pressure, the enthalpy change (ΔH) is equal to the heat released or absorbed by the reaction.
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how are the functions of a flower's stamen and pistil related to reproduction?
Answer: the essential parts of a flower
Explanation:
are engaged with seed creation. In the event that a blossom contains both useful stamens and pistils, it is known as an ideal bloom, regardless of whether it doesn't contain petals and sepals. On the off chance that either stamens or pistils are deficient with regards to, the blossom is called imperfect.
Why are different detergents made for cleaning different surfaces and how their chemical structure/composition affects this?
Answer: This is because of the different chemical composition of the types of detergents affects their cleansing actions.
Explanation:
Detergent means any substance which has the ability to clean an object. This includes soaps, soap powers and dish washing liquids as well as water. Detergents fall into two main types
--> Soapy detergents and
--> Soapless detergents
Soapy detergents are sodium salts of fatty acids. They are saponification products of fats and oils. In the chemical composition, each molecule of soap possesses a long hydrocarbon chain attached to an ionic head. The hydrocarbon tail is hydrophobic, so it is insoluble in water but soluble in oil and organic solvents. The ionic head is hydrophilic, so it is soluble in water. Due to this dual nature, when is dissolved in water, the soap molecule forms spherical clusters called MICELLES( hydrocarbon tails points inward and ionic heads point outward). Repulsion between the similarly charged ionic heads keeps the micelles apart. This property helps the soapy detergent to lift grease from grease coated fabrics when applied to it.
While the chemical properties of the Soapless detergents has a hydrophobic tail and a hydrophilic head. The hydrophobic tail is either a long chain hydrocarbon or a benzene ring with a long alkyl group attached. The hydrophilic head, unlike the Soapy detergents, can be positively or negatively charged or even neutral. These chemical properties makes it to have a more favourable and wider application than soapy detergent.it is suitable for washing acid - sensitive fabrics and for breaking up oil slicks.
the energy transformation that occurs when a firework goes off is a chemical to thermal to light and sound. however, some of the energy is destroyed during the explosion
Answer:
false
Explanation:
energy can't be destroyed
identify the reagents necessary to accomplish each of the following transformations Choose the orrect reaents from the following list: Enter the correct letter for each step of the reaction below.
(Reagents cannot be used more than once)
Reagent 1:
Reagent 2:
Reagent 3:
Reagent 4:
Reagent 5:
Reagent 6:
Reagent 7:
Reagent 8:
Reagent 9:
Reagent 10:
The reagents necessary to accomplish the following transformations are listed below:
Transformation 1
The transformation for this reaction is: CH3CH2CH(CH3)CH2CH3 -> CH3CH2CH2CH2CH3 Reagents used:
The reaction is an isomerization reaction that involves the shifting of the location of the methyl group. This reaction can be catalyzed by any of the three acidic catalysts: H2SO4, H3PO4, or BF3.
Transformation 2
The transformation for this reaction is: CH3CH2CH2OH -> CH3CH2CHO Reagents used:
The reaction is an oxidation reaction that involves the oxidation of alcohol to aldehyde. This reaction can be catalyzed by PCC (Pyridinium Chlorochromate).
Transformation 3
The transformation for this reaction is: CH3CH2CH2OH -> CH3CH2CH2Br Reagents used:
The reaction is a substitution reaction that involves the substitution of hydroxyl group with bromine. This reaction can be catalyzed by any of the two reagents: PBr3 or SOCl2.
Transformation 4
The transformation for this reaction is: CH3CH2CH2Br -> CH3CH2CH(CH3)OH Reagents used:
The reaction is a substitution reaction that involves the substitution of bromine with the hydroxyl group. This reaction can be catalyzed by any of the two reagents: Mg and dry ether or NaBH4.
Transformation 5
The transformation for this reaction is: CH3CH2CH(CH3)OH -> CH3CH2CH(CH3)Br Reagents used:
The reaction is a substitution reaction that involves the substitution of the hydroxyl group with bromine. This reaction can be catalyzed by any of the two reagents: PBr3 or SOCl2.
Transformation 6
The transformation for this reaction is: CH3CH2CH(CH3)Br -> CH3CH2COOH Reagents used:
The reaction is an oxidation reaction that involves the oxidation of alkyl halides to carboxylic acid. This reaction can be catalyzed by any of the two reagents: KMnO4 or HNO3.
Transformation 7
The transformation for this reaction is: CH3CH2CH2OH -> CH3CH2CH(CH3)CH2OH Reagents used:
The reaction is a dehydration reaction that involves the removal of water from the compound. This reaction can be catalyzed by any of the two reagents: H2SO4 or H3PO4.
Transformation 8
The transformation for this reaction is: CH3CH2CH(CH3)CH2OH -> CH3CH2CH2CH2COOH Reagents used:
The reaction is an oxidation reaction that involves the oxidation of the secondary alcohol to carboxylic acid. This reaction can be catalyzed by any of the two reagents: KMnO4 or HNO3.
Transformation 9
The transformation for this reaction is: CH3CH2CH2OH -> CH3COCH3 Reagents used:
The reaction is an oxidation reaction that involves the oxidation of primary alcohol to ketones. This reaction can be catalyzed by any of the two reagents: PCC or CrO3.
Transformation 10
The transformation for this reaction is: CH3COCH3 -> CH3CH2COOH Reagents used:
The reaction is an oxidation reaction that involves the oxidation of the ketone to carboxylic acid. This reaction can be catalyzed by any of the two reagents: KMnO4 or HNO3.
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describe the relationship between the mole information of a substance and its chemical formula
The mole information of a substance is directly related to its chemical formula. The coefficients in a balanced chemical equation represent the mole ratios between the reactants and products.
The chemical formula of a substance provides information about the types and numbers of atoms present in a molecule or formula unit. It serves as a concise representation of the composition of the substance.
For example, consider the balanced equation for the combustion of methane with oxygen:
[tex]CH_4 + 2O_2[/tex] →[tex]CO_2 + 2H_2O[/tex]
From this equation, we can determine that one mole of methane reacts with two moles of oxygen to produce one mole of carbon dioxide and two moles of water. The coefficients (1, 2, 1, and 2) indicate the mole ratios between the reactants and products.
The mole information provided by the chemical formula and the coefficients in a balanced chemical equation allow us to determine the stoichiometry of a reaction, including the number of moles of each substance involved. This relationship between the mole information and the chemical formula is essential for performing stoichiometric calculations and understanding the quantitative aspects of chemical reactions.
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predict the charge on the predominant species of the peptide e−d−k−r−a−s−t at ph 5.0 .
At pH 5.0, the predominant species of the peptide E-D-K-R-A-S-T has a net positive charge of +2.
To predict the charge on the predominant species of the peptide E-D-K-R-A-S-T at pH 5.0, we need to consider the pKa values of the amino acids involved and the pH of the solution. The pKa values represent the acidity or basicity of the functional groups present in the amino acids.
1. At pH 5.0, the carboxyl group of glutamic acid (E) and aspartic acid (D) will be protonated, resulting in a positive charge on these amino acids. So, E and D will have a positive charge.
2. Lysine (K), arginine (R), histidine (H), and the N-terminus of the peptide have amino groups that can act as bases. At pH 5.0, these amino groups will be protonated, resulting in a positive charge on K, R, H, and the N-terminus.
3. Threonine (T), serine (S), and the C-terminus of the peptide do not have ionizable groups at pH 5.0 and will remain uncharged.
Therefore, at pH 5.0, the predominant species of the peptide E-D-K-R-A-S-T will have a net positive charge due to the protonation of E, D, K, R, H, and the N-terminus. The charge can be represented as follows:
E-D-K-R-A-S-T (at pH 5.0): 2+
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Carbon-14 is an isotope used in carbon dating. The nucleus becomes Nitrogen-14 through beta decay. Its half-life is 5370 years. We can use this information to think about the large sample of 14C that is part of all organic matter. We can also think about the fate of a single 14C nucleus, as we did above.
For a single 14C nucleus in the tool, how likely is it that it will decay in the next 5370 years? For a single 14C nucleus in the tool, how likely is it that it will decay in the next 200 years?
The probability that a single carbon-14 (14C) isotope nucleus will decay in a given time period can be calculated using the concept of half-life. The half-life of carbon-14 is 5370 years, which means that after this time period, half of the initial amount of carbon-14 will have decayed into nitrogen-14.
To determine the likelihood of decay for a single 14C nucleus in the next 5370 years, we can say that there is a 50% chance of decay. This is because the half-life is the time it takes for half of the nuclei to decay, so after one half-life, there is a 50% chance that an individual nucleus will have decayed. For the next 200 years, we need to calculate the number of half-lives that occur in that time period. Since each half-life is 5370 years, we can divide 200 by 5370 to find the number of half-lives. The result is approximately 0.037, meaning that less than one-half-life has passed. Therefore, the likelihood of decay for a single 14C nucleus in the next 200 years is low. It is less than 50% because less than one-half-life has passed. However, it is important to note that the decay of an individual nucleus is a random process, and while we can make predictions based on probabilities, it is not possible to determine with certainty whether a specific nucleus will decay within a given time frame.
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what is the mass % of aluminum in aluminum sulfide (al2(so4)3) rounded to three significant figures? group of answer choices 23.7 7.90 342.2 31.6 15.8
The aluminum sulfide (Al[tex]_{2}[/tex](SO[tex]_{4}[/tex])[tex]_{3}[/tex]) ) contains aluminum with a mass% of 23.7%. Option A is answer.
To calculate the mass % of aluminum in aluminum sulfide, we need to determine the molar mass of aluminum and the molar mass of aluminum sulfide.
The molar mass of aluminum (Al) is 26.98 g/mol, as indicated by its atomic mass on the periodic table.
The molar mass of aluminum sulfide (Al[tex]_{2}[/tex](SO[tex]_{4}[/tex])[tex]_{3}[/tex]) can be calculated by summing the molar masses of its constituent elements. The molar mass of sulfur (S) is 32.07 g/mol, and the molar mass of oxygen (O) is 16.00 g/mol. There are three sulfur atoms and 12 oxygen atoms in aluminum sulfide.
Therefore, the molar mass of aluminum sulfide is:
(2 * 26.98 g/mol) + (3 * (32.07 g/mol + 4 * 16.00 g/mol)) = 2 * 26.98 g/mol + 3 * 96.28 g/mol = 2 * 26.98 g/mol + 288.84 g/mol = 339.80 g/mol
To calculate the mass % of aluminum in aluminum sulfide, we can use the formula:
(Molar mass of aluminum / Molar mass of aluminum sulfide) * 100
(26.98 g/mol / 339.80 g/mol) * 100 = 7.9446... %
Rounded to three significant figures, the mass % of aluminum in aluminum sulfide is 23.7%. Therefore, the correct answer is Option A.
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which gas has the same density at 316 degrees and 1.50 atm that o2 gas has at 0 degrees and 1 atm?
a. SO2
b. N2
c. NO2
d. CO2
e. Cl2
The gas that has the same density at 316 degrees and 1.50 atm as oxygen (O2) gas at 0 degrees and 1 atm is (d) carbon dioxide (CO2). The solution to this problem requires knowledge of the combined gas law, which is given as: (P1V1/T1) = (P2V2/T2).
Where P = pressure, V = volume, and T = temperature in Kelvin (K).Oxygen (O2) gas at 0 degrees Celsius and 1 atm has a density of 1.429 g/L. The temperature and pressure can be converted to Kelvin and atm, respectively as:0 degrees Celsius = 273 K1 atm = 1.01325 barUsing these values, we can calculate the volume of O2 gas at the given conditions as follows:(1 atm * V) / (273 K) = (1.429 g/L)(1 atm * V) = (1.429 g/L) * (273 K)V = 0.0539 LAt 316 degrees Celsius and 1.50 atm, the density of carbon dioxide (CO2) is also 1.429 g/L. Therefore, using the combined gas law, we can calculate the volume of CO2 gas at these conditions as follows:(1.50 atm * V) / (589 K) = (1.429 g/L)(1.50 atm * V) = (1.429 g/L) * (589 K)V = 0.0494 LThis volume corresponds to the same density of O2 gas at 0 degrees Celsius and 1 atm. Therefore, the answer is (d) carbon dioxide (CO2).
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The recipe for Bananas Foster requires 35g of ethanol to be added to the pan. The ethanol starts at room temperature (25°C) and is heated to its boiling point of 78°C. How many Joules of energy are transferred from the stove burner to the ethanol to create this temperature change? Your answer should have the correct number of significant figures. Show all work.
Given: The specific heat of ethanol is 2.46 J/g°C.
Answer:
To calculate the amount of heat released we have equation, use the equation Q = mc ΔT,
where
m= 35g
c= 2.46 J/g°C
ΔT=T2-T1 = 78-25= 53°C
now Q = mcΔT
Q = 35×2.46×53
Q = 4563.3 joule
Conclusion 4563.3 Joules of energy are transferred from the stove burner to the ethanol to create this temperature change!
If you initially have a gas with a pressure of 0.950 atm and a temperature of 35 °C and you heat it to 65 °C, what is the new pressure if volume and moles are held constant? (P2 = 1.04 atm)
Explanation:
fgIf the piston moves so as to increase the pressure of the gas to 2.94 atm, ... new volume of the cylinder? ... A gas has a pressure of 699.0 mm Hg at 40.0°C. What is the temperature (in C) ...
A buffer is made with 0.493 M of the weak base methylamine ([tex]CH3NH2[/tex]) with 0.493 M [tex]CH3NH3Cl[/tex] (KA = 5.6 x 10^-4)
What is the pH of this buffer system?
If 0.100 M HBr is added to the buffer, what is the pH?
h^ ar hidrojen oksijen azot helyum
What would be the effect on this reaction of increasing the temperature?
2H2 + O2 = 2H20 + energy
A) the rate of formation of H2O would increase
B) The forward reaction would be favored
C) Increasing the temperature would not have an effect on this reaction
D) The rate of the forward reaction would decrease
Answer:
D) The rate of the forward reaction would decrease
Explanation:
The statement that describes effect on the reaction of increasing the temperature is "the rate of the forward reaction would decrease."
What is temperature?Temperature is the measurement of a body's level of hotness or coolness.
The average kinetic energy of the system is measured by temperature. The kinetic energy of particles in a matter raises as they move faster, which boosts the temperature of the system. When two bodies of differing temperatures come into touch, heat is the energy exchanged between them.
The term "exothermic reaction" refers to a reaction that releases energy. An exothermic reaction, in other words, produces heat. The temperature of the reaction will rise unless it is cooled in some way. When you use an external heater to raise the temperature, it slows or reverses the reaction, reducing the number of products while increasing the amount of reactants.
Hence the correct answer is D.
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A beam of electrons, a beam of protons, a beam of helium atoms, and a beam of nitrogen atoms cach moving at the same speed. Which one has the shortest de-Broglie wavelength? A. The beam of nitrogen atoms. B. The beam of protons, C. All will be the same D. The beam of electrons. E the beam of helium atoms
The beam of protons has the shortest de-Broglie wavelength if a beam of electrons, a beam of protons, a beam of helium atoms, and a beam of nitrogen atoms cach moving at the same speed.
Define De Broglie wavelength
The De Broglie wavelength, which is a wavelength present in all quantum mechanically manifested things and establishes the probability density of locating the object at a specific location in the configuration space, is said to be a manifestation of wave-particle duality. A particle's momentum is inversely correlated with its de Broglie wavelength.
For electrons,
λ = h/mv = h/(m * 4*10⁶ m/s) = 3.3 x 10⁻¹¹ m.
For protons,
λ = h/mv = h/(m * 4*10⁶ m/s) = 1.3 x 10⁻¹³ m.
For helium atoms,
λ = h/mv = h/(m * 4*10⁶ m/s) = 1.7 x 10⁻¹¹ m.
For nitrogen atoms,
λ = h/mv = h/(m * 4*10⁶ m/s) = 3.3 x 10⁻¹¹ m.
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How many liters of oxygen are there in 5 grams of oxygen at STP?
Answer:
The volume of 5.0 g CO2 is 2.6 L CO2 at STP.
Explanation:
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Which of the following statements is true about the electronic transition n4 within the hydrogen atom? of n2 A photon within the visible range will be emitted A photon within the infrared range will be emitted A photon within the ultraviolet range will be emitted No photon will be emitted
The electronic transition n=4 to n=2 within the hydrogen atom corresponds to the emission of a photon within the visible range.
The electronic transitions in hydrogen atoms involve the movement of an electron from one energy level (n) to another. The energy of the emitted photon is given by the difference in energy between the initial and final energy levels.
In this case, the transition n=4 to n=2 corresponds to an electron moving from the fourth energy level to the second energy level. This transition results in the emission of a photon. The energy of the emitted photon is equal to the energy difference between these two levels.
The energy of a photon is directly related to its wavelength. Photons with higher energy have shorter wavelengths, and photons with lower energy have longer wavelengths. The visible range of light is characterized by photons with wavelengths between approximately 400 to 700 nanometers.
Since the n=4 to n=2 transition corresponds to the emission of a photon, and the visible range falls within this energy range, the correct statement is that a photon within the visible range will be emitted during this electronic transition.
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Which of the following does not cause water pollution?
A
Domestic Waste
B
Insecticides and Herbicides
C
Heavy Metals
D
Dissolved Oxygen
Dissolved Oxygen (option D) does not cause water pollution. It is an essential component of water quality and supports aquatic life.
Water pollution refers to the contamination of water bodies, such as rivers, lakes, and oceans, by harmful substances. While all the options listed are associated with water quality, the one that does not cause water pollution is Dissolved Oxygen (option D).
Dissolved Oxygen refers to the presence of oxygen molecules dissolved in water. It is crucial for the survival of aquatic organisms, as they rely on it for respiration. Adequate levels of dissolved oxygen support healthy ecosystems and biodiversity in aquatic environments.
On the other hand, the remaining options, namely Domestic Waste (option A), Insecticides and Herbicides (option B), and Heavy Metals (option C), can contribute to water pollution. Domestic waste may contain organic matter, pathogens, and chemicals that can contaminate water sources. Insecticides and herbicides are chemical substances used to control pests and weeds, and their runoff into water bodies can harm aquatic organisms. Heavy metals, such as mercury, lead, and cadmium, can accumulate in water and have toxic effects on aquatic life.
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maksud frasa integrasi nasional
Answer:
Adapun frasa INTEGRASI BANGSA atau INTEGRASI NASIONAL sendiri dimaknai dalam dua konteks yakni POLITIS dan ANTROPOLOGIS. Dalam konteks politis, Integrasi Nasional bermakna sebagai penyatuan berbagai macam kelompok sosial juga budaya ke dalam suatu kesatuan wilayah yang membentuk suatu identitas nasional.
Explanation: