The addition of more water to the test tube during the lab experiment delays the precipitation of KNO3 due to the dilution effect. Dilution reduces the concentration of KNO3, which slows down the rate at which the solute particles collide and form a precipitate. Consequently, a longer waiting time is necessary to observe the desired precipitation.
The addition of more water to a test tube during a lab experiment increases the time required for precipitation of KNO3. This is due to the dilution effect, where increasing the volume of water reduces the concentration of KNO3, thus slowing down the rate of precipitation.
During the lab experiment, the addition of more water to the test tube prolongs the time required for precipitation of KNO3. This phenomenon can be explained by the concept of dilution. When water is added to the test tube, it increases the total volume of the solution. As a result, the concentration of KNO3, which is responsible for the precipitation, decreases.
Precipitation occurs when the solute reaches its saturation point in the solution. At this point, the solute particles begin to come together and form solid particles, resulting in the formation of a precipitate. However, by adding more water, the concentration of KNO3 decreases, and it takes longer for the solute particles to reach the saturation point.
In a more diluted solution, the solute particles are more spread out, and their chances of colliding and coming together are reduced. This leads to a slower rate of precipitation. The time required for the solute particles to collide and form solid particles increases, requiring a longer waiting time for the precipitation to occur.
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The main reason why you have to wait for a longer time to get precipitation of KNO3 is that the concentration of the KNO3 solution in the test tube decreases when you add water to it. You can observe the precipitation of KNO3 by using a test tube to prepare a concentrated solution.
This experiment involves dissolving KNO3 in hot water, which causes the KNO3 to dissolve more quickly than it would in cold water. The KNO3 solution is then placed in a test tube to cool, which causes the KNO3 to become less soluble in water. This process is called precipitation.When you add water to the test tube, you are diluting the KNO3 solution. This dilution reduces the concentration of the KNO3 solution in the test tube. Consequently, the concentration of KNO3 decreases, and the solubility of the compound decreases as well.
Since the solubility of KNO3 decreases, it takes longer for the KNO3 to precipitate out of the solution, and you have to wait for a longer time to observe the precipitation of KNO3. the reason why you have to wait longer for the precipitation of KNO3 when you add more water to the test tube is that the dilution of the KNO3 solution reduces its concentration, which decreases the solubility of the compound. As a result, it takes longer for the KNO3 to precipitate out of the solution, and you have to wait for a longer time to observe the precipitation of KNO3.
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most thermal conductors are made of which material?
Answer:
Copper
Explanation:
Calculate the number of NaBr formula units formed when 50 NBr3 molecules and 57 NaOH formula units react? 2NBr3 + 3NaOH ---> N2 + 3NaBr + 3HOBr
When 50 NBr3 molecules and 57 NaOH formula units react according to the given balanced equation, the result is the formation of 150 NaBr formula units.
According to the balanced equation provided:
2 NBr3 + 3 NaOH -> N2 + 3 NaBr + 3 HOBr
From the equation, we can see that 2 moles of NBr3 react with 3 moles of NaOH to form 3 moles of NaBr.
To determine the number of NaBr formula units formed, we need to convert the given quantities into moles.
Given:
Number of NBr3 molecules = 50
Number of NaOH formula units = 57
To convert the number of NBr3 molecules to moles, we need to divide the given quantity by Avogadro's number. Similarly, for NaOH formula units, we can directly consider them as moles.
Using Avogadro's number (6.022 x 10^23 molecules/mol), we can calculate the number of moles for NBr3 and NaOH:
Number of moles of NBr3 = 50 / (6.022 x 10^23)
Number of moles of NaOH = 57
Now, we can use the mole ratios from the balanced equation to determine the number of moles of NaBr formed. From the equation, we know that 2 moles of NBr3 react to form 3 moles of NaBr.
Number of moles of NaBr = (Number of moles of NBr3) x (3 moles of NaBr / 2 moles of NBr3)
Finally, we can convert the number of moles of NaBr to the number of NaBr formula units using Avogadro's number:
Number of NaBr formula units = (Number of moles of NaBr) x Avogadro's number
Calculating these values, we find that 50 NBr3 molecules and 57 NaOH formula units react to form 150 NaBr formula units.
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why does biphenyl have a higher boiling point than naphthalene
Biphenyl has a higher boiling point than naphthalene due to stronger intermolecular forces between its molecules such as dispersion forces and π-π interactions, present in the biphenyl molecule.
The higher boiling point of biphenyl compared to naphthalene can be attributed to the structural differences between the two compounds and the resultant differences in intermolecular forces. Biphenyl consists of two phenyl (C6H5) rings connected by a single bond. Each phenyl ring has a delocalized π electron system, which creates regions of electron density above and below the plane of the molecule. These π electron systems allow for strong dispersion forces and π-π interactions between adjacent biphenyl molecules. The extended surface area of the molecule and the presence of these strong intermolecular forces contribute to a higher boiling point for biphenyl.
On the other hand, naphthalene is a fused aromatic hydrocarbon composed of two benzene rings. It also exhibits dispersion forces and π-π interactions, but the molecular shape of naphthalene is different from biphenyl. Naphthalene has a planar structure with a central carbon bridge, resulting in a smaller surface area compared to biphenyl. The reduced surface area and weaker intermolecular forces in naphthalene lead to a lower boiling point compared to biphenyl.
In summary, the higher boiling point of biphenyl compared to naphthalene can be attributed to the larger surface area and stronger intermolecular forces, such as dispersion forces and π-π interactions, present in the biphenyl molecule.
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Which subatomic particle plays the greatest part in determining the properties of an element?A.protonB.electronC.neutronD.nucleus
The subatomic particle that plays the greatest part in determining the properties of an element is the electron (B).
The properties of an element are primarily determined by its atomic structure. Elements are characterized by the number of protons, neutrons, and electrons they possess.
Protons and neutrons are located in the nucleus of an atom, while electrons orbit around the nucleus in energy levels or shells.
The electron configuration of an atom, specifically the arrangement and distribution of electrons in the outermost shell, is what primarily influences the chemical and physical properties of an element. The behavior of atoms in chemical reactions, bonding patterns, and electrical conductivity are all related to the movement and interactions of electrons.
Although protons and neutrons contribute to factors such as atomic mass and stability, the electron's involvement in chemical reactions and interactions is most significant in determining an element's properties.
Therefore, the subatomic particle that plays the greatest part in determining the properties of an element is the electron (B).
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As a bond between a hydrogen atom and a sulfur atom is formed, are the electrons shared or transferred to form a covalent or ionic bond?
When a bond is formed between a hydrogen atom and a sulfur atom, the electrons are shared to form a covalent bond.
In the process of bond formation between a hydrogen atom and a sulfur atom, the outermost electron shell of hydrogen (which has one electron) and the outermost electron shell of sulfur (which has six electrons) are involved. Both hydrogen and sulfur need to achieve a stable electron configuration, typically by filling their valence shell with a total of two electrons for hydrogen and eight electrons for sulfur.
To form a covalent bond, the hydrogen atom shares its electron with the sulfur atom. The electron pair is shared between the two atoms, allowing both atoms to achieve a more stable electron configuration. This sharing of electrons enables each atom to have a filled valence shell, satisfying the octet rule for both hydrogen and sulfur.
Therefore, in the case of a hydrogen-sulfur bond, the electrons are shared rather than transferred, indicating the formation of a covalent bond. The covalent bond allows the two atoms to share electrons in a mutually beneficial manner, resulting in a stable molecule.
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I need help fast asffff please hurry this is due at 6:00 !!! In terms of classification of matter, What do salt water, sugar water, and vinegar have in common?
They all are liquid (at room temperature), all are homogeneous mixture.
Consider this reaction and its rate law. 4A + 3B rightarrrow products rate = k[A]^2 [B]^2 What is the order with respect to A? What is the order with respect to B? What is the overall reaction order?
The order with respect to A in the given reaction is 2. The order with respect to B in the given reaction is 2. The overall reaction order is 4.
The rate law of a chemical reaction expresses how the rate of the reaction depends on the concentrations of the reactants. In the given reaction, the rate law is stated as rate = k[A]^2 [B]^2, where k is the rate constant and [A] and [B] represent the concentrations of A and B, respectively.
The order with respect to A is determined by the exponent of [A] in the rate law, which is 2 in this case. This means that the rate of the reaction is directly proportional to the square of the concentration of A. Thus, doubling the concentration of A would result in a fourfold increase in the rate of the reaction, and halving the concentration of A would lead to a decrease in the rate by a factor of four. Similarly, the order with respect to B is determined by the exponent of [B] in the rate law, which is also 2 in this case. Therefore, the rate of the reaction is directly proportional to the square of the concentration of B.
The overall reaction order is the sum of the individual orders with respect to each reactant. In this case, the order with respect to A and B is 2, and when added together, the overall reaction order becomes 4. Understanding the order with respect to each reactant and the overall reaction order is crucial for understanding the rate behavior of the reaction and designing appropriate reaction conditions or mechanisms. In this particular reaction, the rate is highly dependent on the concentrations of both A and B, with their squares contributing significantly to the overall reaction rate.
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GC-mass spectrometry is used to find the_______ of each compound in a________
A. electromagnetic spectrum, mixture of alkanes
B. molecular weight, mixture of compounds
C. electromagnetic spectrum, mixture of compound
D. B and C
E. none of these
Answer:
B
Explanation:
G=gas while mass means the molecular weight
What volume of a 0.540 M NaOH solution contains 12.5 g of NaOH? 0.169 L 5.92 L 0 0579 1.73 L 0 718L
The volume of a 0.540 M NaOH solution that contains 12.5 g of NaOH is approximately 0.718 L.
To calculate the volume of the solution, we can use the formula:
Volume (L) = Mass (g) / Concentration (Molarity) * Molar Mass (g/mol)
First, we need to determine the molar mass of NaOH, which is 22.99 g/mol for sodium (Na), 16.00 g/mol for oxygen (O), and 1.01 g/mol for hydrogen (H). Adding these values together gives us a molar mass of 39.99 g/mol for NaOH.
Now, we can substitute the given values into the formula:
Volume (L) = 12.5 g / 0.540 M * 39.99 g/mol
Simplifying the calculation:
Volume (L) = 0.718 L
Therefore, the volume of the 0.540 M NaOH solution that contains 12.5 g of NaOH is approximately 0.718 L.
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nitrogen gas is collected over water at 15 deg c the toal presure is 745 torr what is the denstiy of the nigtrogen gas after filin ghtis continer
The density of nitrogen gas at 15°C is 1.16 g/L. When nitrogen gas is collected over water, the total pressure is equal to the sum of the vapor pressure of water and the partial pressure of nitrogen gas. The vapor pressure of water at 15°C is 12.8 torr. Therefore, the partial pressure of nitrogen gas is 732.2 torr (745 torr - 12.8 torr).
The density of nitrogen gas is calculated using the ideal gas law equation as follows:PV = nRTwhere P is the pressure in atm, V is the volume in L, n is the number of moles, R is the gas constant (0.0821 L·atm/K·mol), and T is the temperature in Kelvin (K).The volume of the container is not given in the problem. Hence, we cannot directly calculate the density. However, we can rearrange the equation to solve for density instead of volume as follows:density (ρ) = (n × M) / Vwhere n is the number of moles, M is the molar mass, and V is the volume in L.
We can assume that the volume of water displaced is negligible. Therefore, the volume of the container is equal to the volume of nitrogen gas. We can also assume that the nitrogen gas behaves ideally. Hence, we can use the ideal gas law to calculate the number of moles as follows:PV = nRTn = (PV) / RTwhere P = 732.2 torr, V = volume of the container in L, R = 0.0821 L·atm/K·mol, and T = (15°C + 273.15) = 288.15 K. Molar mass of nitrogen gas is 28 g/mol.Using these values, we can calculate the density of nitrogen gas as follows:density = (n × M) / V = (PV / RT) × M / V= (732.2 torr × V / (0.0821 L·atm/K·mol × 288.15 K)) × (28 g/mol / 1000 g/L) / V= (732.2 torr × 28 g/mol) / (0.0821 L·atm/K·mol × 288.15 K × 1000) = 1.16 g/LTherefore, the density of nitrogen gas after filling this container is 1.16 g/L.
Nitrogen gas is collected over water at 15°C. The total pressure is 745 torr. The density of nitrogen gas after filling this container can be determined using the ideal gas law equation. The total pressure is equal to the sum of the vapor pressure of water and the partial pressure of nitrogen gas. The vapor pressure of water at 15°C is 12.8 torr.
Therefore, the partial pressure of nitrogen gas is 732.2 torr (745 torr - 12.8 torr).The volume of the container is not given in the problem. However, we can use the ideal gas law to calculate the number of moles of nitrogen gas. We can also assume that the volume of water displaced is negligible and that the nitrogen gas behaves ideally. The molar mass of nitrogen gas is 28 g/mol. Using these values, we can calculate the density of nitrogen gas as 1.16 g/L.Therefore, the density of nitrogen gas after filling this container is 1.16 g/L.
The density of nitrogen gas after filling this container over water at 15°C is 1.16 g/L.
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what are the environmental pressers of a rabbit
Answer:
Larger predators would cause the rabbit to run faster to outrun their predator, so speed is a variation. Also their environment where they might need to blend in with their surroundings so skin color.
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What did Ernest Rutherford’s gold foil experiment demonstrate about an atom?
Each atom is composed of electrons and positive material.
The mass of the atom is evenly spread throughout the atom.
Neutrons are located in the center of the atom.
Positive charge occupies a very small volume in the atom.
Answer:
The last one, Positive charge occupies a very small volume in the atom.
Explanation:
what is the molarity of an h2so4 solution if 25.00 ml is exactly neutralized by 32.63 ml of 0.164 m naoh?
The balanced equation for the neutralization reaction between NaOH and H2SO4 can be given as follows: H2SO4 + 2NaOH → Na2SO4 + 2H2OThe stoichiometry of the reaction shows that 1 mole of H2SO4 reacts with 2 moles of NaOH.
We can calculate the moles of NaOH that reacted as follows:0.164 M NaOH = 0.164 moles/Liter
Therefore, the number of moles of NaOH present in 32.63 mL can be calculated as follows:
0.164 moles/L * 0.03263 L
= 0.00535 moles
Now we know that 0.00535 moles of NaOH were present in 25.00 mL of H2SO4. Since the stoichiometry shows that 1 mole of H2SO4 reacts with 2 moles of NaOH, we can calculate the number of moles of H2SO4 that were present in 25.00 mL of H2SO4 as follows:
0.00535 moles of NaOH * 1 mole of H2SO4/2 moles of NaOH
= 0.002675 moles of H2SO4
Now that we know the number of moles of H2SO4 present in 25.00 mL of solution, we can calculate the molarity of the solution as follows:
Molarity = Moles of solute/Volume of solution (in liters)
Molarity = 0.002675 moles/0.02500 Liters
= 0.107 M H2SO4
Therefore, the molarity of the H2SO4 solution is 0.107 M.
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calculate the concentration of an aqueous solution of ca(oh)2 that has a ph of 11.31.
The concentration of the aqueous solution of Ca(OH)2 with a pH of 11.31 is approximately 0.00126 M.
To calculate the concentration of Ca(OH)2, we first determine the pOH of the solution by subtracting the pH from 14: pOH = 14 - 11.31 = 2.69. The pOH represents the negative logarithm (base 10) of the hydroxide ion concentration.
Using the pOH value, we can find the concentration of OH- ions: [OH-] = 10^(-pOH) = 10^(-2.69) ≈ 0.00126 M.
Since each formula unit of Ca(OH)2 dissociates into two OH- ions, the concentration of Ca(OH)2 is twice the concentration of OH- ions. Therefore, the concentration of the Ca(OH)2 solution is approximately 2 * 0.00126 M, which is 0.00252 M.
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True or false? The scientific process is linear and always follows the same sequence of steps in the same order.
A) true
B) false
Answer:
True
Explanation:
If you were to change up the order the answer may be incorrect
The scientific process is linear and most commonly follows the same sequence of steps in the same order. However, it need to follow all the steps for all scientific process. Hence, the statement is false.
What is a scientific process ?A scientific process is a well designed approach to investigate or analyze the problem and to test a relevant hypothesis. The steps included in the scientific process starts from a scientific question.
The question then generates a hypothesis based on the observations and standard data. The testing is conducted with well designed experiment with all practical tools available.
The experimental results are thoroughly evaluated and the reaches with a conclusion. The results are communicated through various journals. This is the general way of a scientific process. But not every scientific strictly need to follow this. Hence, the statement is false.
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the radius of a single atom of a generic element x is 125 picometers (pm) and a crystal of x has a unit cell that is body-centered cubic. calculate the volume of the unit cell.
The volume of the unit cell in a body-centered cubic crystal of element X can be calculated as 1.96 x 10^-22 cubic meters.
In a body-centered cubic (BCC) crystal structure, there is one atom at each of the eight corners of the unit cell and one atom at the center of the unit cell. The atom at the center of the unit cell is shared between eight adjacent unit cells.
The diagonal of the unit cell can be calculated using the radius of the atom. In a BCC structure, the diagonal (d) of the unit cell is equal to four times the radius (r) of the atom.
d = 4r = 4 * 125 pm = 500 pm
To convert picometers (pm) to meters (m), we divide by 10^12:
d = 500 pm / (10^12 pm/m) = 5 x 10^-10 m
The volume of the unit cell (V) can be calculated using the formula:
V = (d^3) / (4√3)
V = (5 x 10^-10 m)^3 / (4√3) = 1.96 x 10^-22 cubic meters
Therefore, the volume of the unit cell in a body-centered cubic crystal of element X is approximately 1.96 x 10^-22 cubic meters.
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Write a net ionic equation for the overall reaction that occurs when aqueous solutions of phosphoric acid (H3PO4) and potassium hydroxide are combined. specify states such as (aq) or (s).
The net ionic equation for the reaction between aqueous solutions of phosphoric acid (H₃PO₄) and potassium hydroxide (KOH) is:
2H⁺(aq) + 2OH⁻(aq) → 2H₂O(l)
In this reaction, two hydrogen ions (H⁺) from the phosphoric acid combine with two hydroxide ions (OH⁻) from the potassium hydroxide to form two water molecules (H₂O).
When H₃PO₄ dissociates in water, it releases three H⁺ ions, while KOH dissociates to produce one OH⁻ ion. The balanced molecular equation is:
H₃PO₄(aq) + 3KOH(aq) → 3H₂O(l) + K₃PO₄(aq)
However, the net ionic equation focuses on the species directly involved in the reaction, excluding spectator ions that do not undergo any change. In this case, the spectator ions are the K⁺ and the phosphate ion (PO₄³⁻). Therefore, the net ionic equation only includes the hydrogen and hydroxide ions, resulting in the equation mentioned above.
The net ionic equation accurately represents the essential species and stoichiometry involved in the reaction between phosphoric acid and potassium hydroxide.
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Helppp meee plzzz plzzzz
Helppp
Answer:F =MAX
Explanation:I did that
Answer:
F=MAX
Explanation:
I DID THAT TODAY AT 9:05AM FRIDAY 1/22/2021
Potassium metal reacts with water according to the following balanced equation.
2K(s)+2H2O(l)⟶2KOH(aq)+H2(g)
If one mole of potassium reacts in this manner, how many moles of water are consumed?
moles of water:
mol
If one mole of potassium reacts in this manner, how many moles of H2 are produced?
moles of H2:
mol
How many moles of potassium are required to produce 17.0 moles of H2?
moles of potassium:
mol
How many moles of KOH are produced if 3477.9 moles of H2O are consumed?
moles of KOH:
mol
Moles of water consumed: 2 moles. Moles of H2 produced: 1 mole. Moles of potassium required to produce 17.0 moles of H2: 17.0 moles. Moles of KOH produced if 3477.9 moles of H2O are consumed: 3477.9 moles
According to the balanced equation, 2 moles of potassium (2K) react with 2 moles of water (2H2O) to produce 2 moles of KOH (2KOH) and 1 mole of H2 (H2). Therefore, for every mole of potassium reacting, 1 mole of water is consumed and 1 mole of H2 is produced.
To calculate the moles of water consumed when one mole of potassium reacts, we use the stoichiometric coefficients from the balanced equation, which gives us 2 moles of water consumed.
Similarly, when one mole of potassium reacts, we find that 1 mole of H2 is produced.
To determine how many moles of potassium are required to produce 17.0 moles of H2, we can set up a ratio using the stoichiometric coefficients. From the balanced equation, we know that 2 moles of potassium react to produce 1 mole of H2. Therefore, we have:
2 moles of potassium / 1 mole of H2 = x moles of potassium / 17.0 moles of H2
Solving for x gives us x = 17.0 moles of potassium.
Finally, to calculate the moles of KOH produced when 3477.9 moles of H2O are consumed, we again use the stoichiometric coefficients. From the balanced equation, we know that 2 moles of KOH are produced for every 2 moles of water consumed. Therefore, we have:
2 moles of KOH / 2 moles of water = x moles of KOH / 3477.9 moles of H2O
Simplifying this gives us x = 3477.9 moles of KOH.
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Following glycolysis and the citric acid cycle, but before the electron transport chain and oxidative phosphorylation, the carbon skeleton of glucose has been completely broken down to CO2. At that point most of the energy from the original glucose molecule is stored in: Acetyl-CoA NAD+ ATP NADH a H+ gradient
At the point after glycolysis and the citric acid cycle, but before the electron transport chain and oxidative phosphorylation, most of the energy from the original glucose molecule is stored in NADH.
During glycolysis, a glucose molecule is partially broken down into two molecules of pyruvate, generating a small amount of ATP and NADH. The pyruvate then enters the mitochondria, where it is converted to Acetyl-CoA, which enters the citric acid cycle (also known as the Krebs cycle).
In the citric acid cycle, Acetyl-CoA is further broken down, producing NADH, ATP, and FADH2. These electron carriers (NADH and FADH2) carry high-energy electrons that are used in the electron transport chain.
Before the electron transport chain and oxidative phosphorylation, the carbon skeleton of glucose has been completely broken down to CO2, and most of the energy from the glucose molecule is stored in the high-energy electron carriers NADH and FADH2. NADH, in particular, carries a significant amount of the energy derived from glucose breakdown.
Therefore, at this stage, most of the energy from the original glucose molecule is stored in NADH.
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Calculate the mass of arsenic(III) chloride produced when 0.150 g of arsenic reacts with excess chlorine according to the equation:
2As+3Cl2 → 2AsCl3
Answer:
0.363 g
Explanation:
2As + 3Cl₂ → 2AsCl₃
calculate the number of moles of arsenic
Number of moles = mass/ molar mass
Number of moles = 0.150 g/ 75 g/mol
Number of moles = 0.002 mol
compare the moles of arsenic with arsenic chloride.
As : AsCl₃
2 : 2
0.002 : 0.002
Mass of arsenic chloride produced:
Mass = number of moles × molar mass
Mass = 0.002 × 181.28 g/mol
Mass = 0.363 g
Mass of arsenic chloride produced is 0.363 g when 0.150 g of arsenic reacts with excess chlorine.
What is Arsenic Chloride ?Arsenic trichloride is an inorganic compound with the formula AsCl₃, also known as arsenous chloride or butter of arsenic.
This poisonous oil is colourless, although impure samples may appear yellow. It is an intermediate in the manufacture of organoarsenic compounds
Given data:
Mass of arsenic chloride produced = ?Mass of arsenic react = 0.150 gMass of chlorine = excessSolution:
Chemical equation:
2As + 3Cl₂ → 2AsCl₃
Let's, calculate the number of moles of arsenic ;
Number of moles = mass/ molar mass
Number of moles = 0.150 g/ 75 g/mol
Number of moles = 0.002 mol
Now we will compare the moles of arsenic with arsenic chloride.
As : AsCl₃
2 : 2
0.002 : 0.002
Mass of arsenic chloride produced:
Mass = number of moles × molar mass
Mass = 0.002 × 181.28 g/mol
Mass = 0.363 g
Therefore,Mass of arsenic chloride produced is 0.363 g when 0.150 g of arsenic reacts with excess chlorine..
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Which of the following groups contains the most reactive elements?
a. the alkali metals
b. the alkaline earth metals
c. the carbon family
d. the noble gases
Answer:
A
Explanation:
They react violently with water
According to the electronic configuration and position in periodic table the alkali metals group has the most reactive elements.
What is electronic configuration?Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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Calculate the wavelength of an x ray that has a frequency of 3 x 1018 Hz. Show all work.
i hate asking so much but i don't understand this and the test is tomorrow.
Answer:
The wavelength of x-ray is 1 ×10⁻¹⁰ m.
Explanation:
Given data:
Frequency of xray = 3×10¹⁸ Hz
Wavelength of xray = ?
Solution:
Formula:
Speed of light = wavelength × frequency
c = λ × f
λ = c/f
This formula shows that both are inversely related to each other.
The speed of light is 3×10⁸ m/s
Frequency is taken in Hz.
It is the number of oscillations, wave of light make in one second.
Wavelength is designated as "λ" and it is the measured in meter. It is the distance between the two crust of two trough.
Now we will put the values in formula.
λ = 3×10⁸ m/s / 3×10¹⁸ Hz
Hz = s⁻¹
λ = 1 ×10⁻¹⁰ m
The wavelength of radiation is 1 ×10⁻¹⁰ m.
according to arrhenius, which of the following ions are produced when an acid is added to water?select one:a.metal ionsb.hydroxide ionsc.hydrogen ionsd.halide ions
Arrhenius theory of acids and bases proposed by Svante Arrhenius in 1884 states that when an acid is added to water, hydrogen ions (H+) are produced. The correct answer is c. hydrogen ions.
According to Arrhenius theory of acids and bases, which was proposed by Swedish scientist Svante Arrhenius in 1884, an acid is a substance that dissociates in water to produce hydrogen ions (H+) while a base is a substance that dissociates in water to produce hydroxide ions (OH-). Therefore, when an acid is added to water, hydrogen ions (H+) are produced. Selecting the correct option from the given optionsAccording to Arrhenius, The correct option from the given options is c. hydrogen ions. Hence, the correct answer is option c. hydrogen ions.
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It contains only one type of molecule or
extended structure.
0. 15 M solution of a weak acid is found to be 1. 3% ionized. What is its K
a
?
Thus, the 0. 15 M solution of a weak acid is found to be 1. 3% ionized which is having Ka is 0.00195.
Given that the concentration of the weak acid is 0.15 M and it is found to be 1.3% ionized. We are to find the value of Ka of this weak acid. We know that for a weak acid HA, Ka is the equilibrium constant of its ionization reaction in water, which can be written as follows;
HA + H2O ⇌ H3O+ + A-
Where Ka = [H3O+][A-] / [HA]
Let the initial concentration of HA be C then the degree of ionization α is given by;α = ionized / CIn this case, the degree of ionization is 1.3% which can be expressed as 0.013 and the initial concentration of
HA is 0.15
M.α = 0.013,
C = 0.15M
So, the concentration of A- is Cα and the concentration of H3O+ is also Cα, because, in the equilibrium equation; [H3O+]:[A-] is 1:1.
On substituting these values in the Ka expression, we get;
Ka = [H3O+][A-] / [HA]
= Cα × Cα / (C - Cα)
But, C - Cα ≈ C in the case where α is very small in comparison to C.
So, Ka = Cα × Cα / Cα
= Cα= 0.15 M × 0.013
= 0.00195
Therefore, the value of Ka for this weak acid is 0.00195.
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Why is cell uncountable?
Answer:
Cells are uncountable becasue they move around your body, make up your skin and other organs as well. And because when you grow, the cells multiply, and that makes it very hard for scientists to count cells in a human's body.
Explanation:
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Phineas turned off the lights in his room to go to sleep. Which part of the eye picks up the shades of gray of his furniture that then helps him to maneuver through his room without lights? O cones O rods O cornea O iris
Answer:
Rods
Explanation:
Rods are photoreceptor cells in the eye that help us see in low light but play little to no role in color vision. Therefore, they would help Phineas to see shades of grey and large shapes in the dark,
Answer:
rods
Explanation:
How many times bigger is the solar system than the earth ?
For the reaction given below, 2.00 moles of A and 3.00 moles of B are placed in a 6.00-L container.
A(g) + 2B(g) C(g)
At equilibrium, the concentration of A is 0.282 mol/L. What is the concentration of B at
equilibrium?
a. 0.282 mol/L
b. 0.397 mol/L
c. 0.500 mol/L
d. 0.564 mol/L
e. none of these
The concentration of B at equilibrium cannot be determined solely based on the information provided. Therefore, the answer is "e. none of these."
To determine the concentration of B at equilibrium, we need to know the equilibrium constant (K) for the given reaction. The equilibrium constant is a ratio of the concentrations of the products to the concentrations of the reactants, each raised to the power of their respective stoichiometric coefficients.
However, in this case, the equilibrium constant is not given. Without the value of K, we cannot calculate the concentration of B at equilibrium. The concentration of A alone does not provide enough information to determine the concentration of B.
Therefore, the correct answer is "e. none of these," as we cannot determine the concentration of B at equilibrium based on the given information.
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