The total mass of the reactants equals the total mass of the products the statement about balanced chemical equations is true. Hence, option B is correct.
This is known as the Law of Conservation of Mass, which states that matter can neither be created nor destroyed in a chemical reaction. In other words, the mass of the reactants must equal the mass of the products in a balanced chemical equation.
While the identities of the atoms may change during a reaction, the total number of atoms of each element on both sides of the equation must be the same, thus leading to the conservation of mass.
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Which statement correctly describes a catalyst?
Responses
It is consumed and slows down a reaction.
It is consumed and speeds up a reaction.
It is not consumed and speeds up a reaction.
It is not consumed and slows down a reaction.
The gas phase reaction between nitric oxide and hydrogen occurs in three elementary steps:
NO + NO <--> N2O2 (fast equilibrium)
N2O2 + H2 --> H2O + N2O (slow)
N2O + H2 --> N2 + H2O (fast)
Based on this mechanism we would expect the rate law to be:
a) Second order in NO, first order in H2, and zero order in H2O
b) Second order in both NO and H2, and zero order in H2O
c) Second order in both NO and H2, and first order in H2O
d) First order in NO, first order in H2, and -1 order in H2O
The correct option is (b) Second order in both NO and H2, and zero order in H2O.
The rate law for a chemical reaction can be determined from its elementary steps and the rate-determining step (RDS). In this mechanism, the RDS is the second step, which is the slowest step, so the rate law will be based on this step.
According to the second step of the mechanism, the stoichiometry of the reaction is 1:1 for N2O2 and H2. Therefore, the rate law should have a second order dependence on both N2O2 and H2. The rate law should also reflect the stoichiometry of the reaction, so it will be:
Rate = k[N2O2][H2]
The final product is H2O, which is not involved in the RDS, so it will not appear in the rate law. The correct answer is (b) Second order in both NO and H2, and zero order in H2O. The fast equilibrium step does not affect the overall rate of the reaction, as it simply establishes an equilibrium concentration of N2O2. The rate law only reflects the RDS, which involves the consumption of N2O2 and H2 to form N2 and H2O.
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The Solubility Product Constant for silver phosphate is 1.3x10^-20 .
The molar solubility of silver phosphate in a 0.223 M sodium phosphate solution is ?M
The Solubility Product Constant for silver phosphate is 1.3x10^-20 . The molar solubility of silver phosphate in a 0.223 M sodium phosphate solution is 77.51×10M.
A homogenous mixture of one or more solutes in a solvent is referred to as a solution. A typical illustration of a solution is the addition of sugar cubes to a cup of tea or coffee. Solubility is a quality that aids in the dissolution of sugar molecules. Thus, the ability of a substance (solute) to dissolve in a specific solvent can be defined as solubility. Any substance that is dissolved in a solvent and is either solid, liquid, or gas is referred to as a solute.
Ksp = [Ag⁺]³ [PO₄⁻]
1.3×10⁻²⁰=0.256³×s
s=77.51×10M
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as the mass of salt increased, what happened to the temperature at which the ice cube melted.
When potassium permanganate and glycerol react, the potential energy of the products is
less than the potential energy of the reactants. Which statement about this reaction is
correct? (1 point)
A. The total potential energy of the system is constant.
B. The reaction is exothermic.
C. The activation energy of the system is negative.
D. The reaction is endothermic.
Regarding this response, the appropriate statement is:.
B. The reaction is exothermic.
Because the potential energy of the products is lower than that of the reactants, energy must be released during the reaction. This indicates that the reaction is exothermic, which means that heat is released as a form of energy. Given that glycerol and potassium permanganate react spontaneously when combined, which suggests that the reaction is energetically advantageous, this is consistent with the fact that the reaction is favorable. The following statements are false in this situation: A. Due to the energy released during the reaction, the total potential energy of the system is not constant. C. The system's activation energy is always positive, so it can never be negative. Since endothermic reactions draw energy from their surroundings, the reaction is not endothermic.
Answer: B
Explanation:
If the potential energy of the products is less than that of the reactants, that must mean that some potential energy was converted into thermal energy during the reaction. Since the reaction released heat, the reaction is exothermic.
b) State two factors that determine the position where the pigments are deposited in the chromatogram from the point of origin. (2mks)
Two factors that determine the position where pigments are deposited in the chromatogram from the point of origin are polarity and solubility.
Polarity is a measure of the distribution of charge within a molecule. In chromatography, a polar solvent is used to carry the pigments up the chromatography paper.
The pigments with a higher polarity will be more attracted to the polar solvent and will travel up the paper at a faster rate. This means that they will be deposited closer to the point of origin than pigments with lower polarity.
Solubility is another factor that determines the position where pigments are deposited in the chromatogram. Pigments that are more soluble in the solvent will travel further up the paper than pigments that are less soluble. The solubility of pigments is influenced by their molecular structure, size, and polarity.
In summary, the position where pigments are deposited in the chromatogram from the point of origin is determined by the polarity and solubility of the pigments.
Pigments with higher polarity and solubility will travel further up the paper and will be deposited closer to the point of origin, while those with lower polarity and solubility will travel a shorter distance and will be deposited further from the point of origin.
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The duration between two events is called ......
Answer:
The duration between two events is called Interval.
4. An oxygen gas has a volume of 225 mL at 75.0° C and 175 mmHg. What will be its volume at a
temperature of 20.0° C and a pressure of 11000 mmHg?
An oxygen gas has a volume of 225 mL at 75.0° C and 175 mmHg the volume of the oxygen gas at the new conditions is 12 mL.
We can use the combined gas law to solve for the volume of the oxygen gas at the second set of conditions:
(P1 * V1) / (T1) = (P2 * V2) / (T2)
Where P1, V1, and T1 are the initial pressure, volume, and temperature, and P2, V2, and T2 are the final pressure, volume, and temperature.
Converting the initial conditions to SI units:
V1 = 225 mL = 0.225 L
T1 = 75.0 + 273.15 = 348.15 K
P1 = 175 mmHg = 0.23 atm
Converting the final conditions to SI units:
T2 = 20.0 + 273.15 = 293.15 K
P2 = 11000 mmHg = 14.47 atm
Now we can solve for V2:
V2 = (P1 * V1 * T2) / (T1 * P2)
V2 = (0.23 * 0.225 * 293.15) / (348.15 * 14.47)
V2 = 0.012 L = 12 mL
Therefore, the volume of the oxygen gas at the new conditions is 12 mL.
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Write a balanced chemical equation for each of the following.
Gaseous carbon monoxide reacts with hydrogen gas to form gaseous methane (CH4) and liquid water.
Express your answer as a chemical equation. Identify all of the phases in your answer.
Answer:
CO+3H2———> CH4+H2O
Explanation:
gavufwvdk if wgbdkiiheh
If 4 moles of gaseous nitrogen gas are confined in a 6.0 L container at 1770C and 12.0 atm. Suppose the container isothermally expand to 36.0 L. What is the final pressure experienced by this gas?
Answer:The initial conditions of the nitrogen gas are:
n = 4 moles
V = 6.0 L
T = 177°C = 450 K
P = 12.0 atm
Using the ideal gas law:
PV = nRT
where R is the universal gas constant (0.08206 L atm/mol K).
We can rearrange the ideal gas law to solve for the final pressure (Pf) at a constant temperature:
Pf = (nRTf) / Vf
where T f and Vf are the final temperature and volume, respectively.
Since the expansion is isothermal, the temperature remains constant at 450 K. The final volume is 36.0 L. Thus:
Pf = (4 mol x 0.08206 L atm/mol K x 450 K) / 36.0 L
Pf = 16.37 atm
Therefore, the final pressure experienced by the nitrogen gas is 16.37 atm.
Explanation:
A 20.0 L helium balloon initially at 25°C and 1.00 atm is heated in the sunlight to a final temperature of 41.6°C. During this process the balloon expands in such a way that the pressure remains constant. What is the change in entropy of the gas during this process? Answer in J/K to three decimal places. R = 8.314 J/mol K = 0.08206 L-atm/mol K
We can apply the following equation to determine the gas's change in entropy:
S = nR T f /Ti ln
Given: 20.0 L is the initial volume (Vi).
Initial temperature (Ti) = 25 °C, which equals 25 + 273.15 K, or 298.15 K.
Final temperature = 41.6°C, which is equal to 41.6 + 273.15 K, or 314.75 K.
Pressure does not change (P)
(R) = 8.314 J/mol K for the gas constant.
The ideal gas law must first be used to calculate the quantity of helium gas (n):
PV = nRT
When we rewrite the equation, we get:
n = PV / RT
replacing the specified values:
n is equal to (1.00 atm) x (20.0 L) / (0.08206 L-atm/mol K x 298.15 K).
n ≈ 0.813 mol
Now we can determine the entropy change:
S = ln(314.75 K / 298.15 K) * (0.813 mol) * (8.314 J/mol K)
ΔS ≈ 1.071 J/K
As a result, the gas's entropy changed by about 1.071 J/K during this operation.
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Calculate the pH of a solution prepared by dissolving 1.30g of sodium acetate, CH3COONa, in 60.5 mL of .20 M acetic acid, CH3COOH(aq). Assume the volume change upon dissolving the sodium acetate is negligible. Ka of CH3COOH is 1.75*10^-5.
The pH of the solution prepared by dissolving 1.30g of sodium acetate in 60.5 mL of 0.20 M acetic acid is approximately 3.34.
To calculate the pH of the solution, we need to consider the equilibrium between the acetic acid (CH3COOH) and its conjugate base, acetate ion (CH3COO-), using the Ka value provided. We will also take into account the presence of sodium acetate (CH3COONa), which will provide additional acetate ions.
First, let's determine the moles of acetic acid present in the solution:
Moles of acetic acid = concentration x volume
Moles of acetic acid = 0.20 M x 60.5 mL x (1 L / 1000 mL)
Moles of acetic acid = 0.0121 mol
Next, let's determine the moles of sodium acetate:
Moles of sodium acetate = mass / molar mass
Moles of sodium acetate = 1.30 g / 82.03 g/mol
Moles of sodium acetate = 0.0158 mol
Since sodium acetate dissociates completely, the concentration of acetate ions (CH3COO-) will be equal to the moles of sodium acetate divided by the total volume of the solution:
Concentration of acetate ions = moles of sodium acetate / total volume
Concentration of acetate ions = 0.0158 mol / 60.5 mL x (1 L / 1000 mL)
Concentration of acetate ions = 0.260 M
Now, we can set up an ICE (Initial, Change, Equilibrium) table to calculate the concentrations of acetic acid and acetate ions at equilibrium:
CH3COOH(aq) + H2O(l) ⇌ CH3COO-(aq) + H3O+(aq)
Initial: 0.0121 M 0 M 0 M
Change: -x +x +x
Equilibrium: 0.0121 - x x x
The Ka expression for acetic acid is:
Ka = [CH3COO-][H3O+] / [CH3COOH]
Using the given Ka value, we can set up the equation:
1.75 x 10^-5 = (x)(x) / (0.0121 - x)
Since x is expected to be small compared to 0.0121, we can approximate the denominator as 0.0121:
1.75 x 10^-5 = x^2 / 0.0121
Simplifying the equation:
x^2 = 1.75 x 10^-5 x 0.0121
x^2 = 2.1175 x 10^-7
x ≈ 4.6 x 10^-4
Now, we can calculate the concentration of H3O+ ions:
[H3O+] = x = 4.6 x 10^-4 M
Finally, we can calculate the pH using the formula:
pH = -log[H3O+]
pH = -log(4.6 x 10^-4)
pH ≈ 3.34
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Calculate the molarity of 33.9 g of MgS in 969 mL of solution.
Answer:
0.620M
Explanation:
molarity= moles of solute/volume of solution
molar mass of mgs= 24.3+32= 56.3
moles= 33.9/56.3=0.601
molarity= 0.601/0.969=0.602M
Which solvent mixture would be expected to deviate most strongly from Raoult’s law?
a) Sulfuric acid (H2SO4) + H2O
b) Acetic acid (CH3COOH) + H2O
c) Butane (C4H10) + octanol (C8H17OH)
d) Methanol (CH3OH) + H2O
Option (c) is expected to deviate most strongly from the given law.
The law states that the partial pressure of each component in an ideal solution is proportional to its mole fraction in the solution. Deviations from Raoult's law occur when the intermolecular interactions between the molecules of the components in the solution are different from those between the molecules of the pure components. The solvent mixture that is expected to deviate most strongly from Raoult's law is the one that has the largest difference in intermolecular interactions between its components.
Among the given choices, option (c) is expected to deviate most strongly from the given law. Butane (C4H10) and octanol (C8H17OH) have very different intermolecular interactions, as butane is nonpolar and octanol is polar. The resulting solution is expected to have different intermolecular forces than either pure component, leading to significant deviations from Raoult's law. Options (a), (b), and (d) are expected to show smaller deviations from Raoult's law, as the intermolecular interactions between the components in each of these mixtures are more similar.
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b. what in tro duc - improvements were made in measuring system with the of standard units
The use of standard units has revolutionized measuring systems by providing a consistent framework, promoting accuracy and precision, enabling comparability, and fostering advancements in measurement technology.
The introduction and use of standard units have greatly improved the measuring systems in several ways.
1. Consistency and Comparability: Standard units provide a common reference point for measurements, ensuring consistency and comparability across different systems and locations. By using standardized units such as the International System of Units (SI), measurements can be accurately compared and communicated worldwide.
2. Precision and Accuracy: Standard units are based on well-defined and internationally accepted definitions, allowing for precise and accurate measurements. They provide clear guidelines for calibration and measurement techniques, reducing errors and uncertainties in the measuring process.
3. Interdisciplinary Compatibility: Standard units facilitate interdisciplinary compatibility by enabling seamless integration of measurements from various fields of science and engineering. Researchers and professionals from different disciplines can exchange and combine data without the need for complex unit conversions, enhancing collaboration and knowledge sharing.
4. Traceability: Standard units are traceable to national or international measurement standards, which ensures the accuracy and reliability of measurements. Traceability provides a clear chain of measurement comparisons, allowing for the establishment of confidence intervals and uncertainties in measured values.
5. Technological Advancements: The adoption of standard units has driven advancements in measurement technologies. The need for accurate and traceable measurements has spurred the development of more precise instruments, improved calibration techniques, and enhanced measurement methodologies.
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How many µg of mercury are contained in 27.2 mL of a 14.10 ppm solution?
7. Propane reacts with oxygen to produce carbon dioxide and water according to
the equation pictured below.
Which of the following statements is correct?
Cz Hq + 50₂
50₂ 3C0₂ + 4H₂O
→
2
*
For every 4 moles of water produced, 3 moles of propane react.
For each mole of oxygen that reacts, 3 moles of carbon dioxide are produced.
For every 3 moles of carbon dioxide produced, 5 moles of oxygen react.
For each mole of propane that reacts, 5 moles of oxygen are produced.
Propane is a hydrocarbon gas that can react with oxygen to produce carbon dioxide and water. This reaction is an example of combustion, where a fuel reacts with oxygen to release energy in the form of heat and light.
The balanced chemical equation for this reaction is:
C3H8 + 5O2 → 3CO2 + 4H2O
This equation tells us that for every mole of propane that reacts, we need 5 moles of oxygen. However, it also tells us that for every mole of oxygen that reacts, we produce 3 moles of carbon dioxide.
This means that the ratio of carbon dioxide to oxygen in this reaction is 3:1. So if we want to produce a certain amount of carbon dioxide, we need to make sure we have enough oxygen to react with the propane. For example, if we want to produce 6 moles of carbon dioxide, we would need 2 moles of oxygen (since 6/3 = 2).
Similarly, if we want to know how much oxygen we need to react with a certain amount of propane, we can use the ratio of propane to oxygen (1:5). For example, if we have 2 moles of propane, we would need 10 moles of oxygen (since 2 x 5 = 10).
Overall, the reaction between propane and oxygen is an important one in many industries, including heating and cooking. Understanding the stoichiometry of this reaction can help us predict how much of each reactant we need to produce a certain amount of product, and can help us optimize our processes for efficiency and safety.
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Circle O is shown. Line segments E O and E O are radii with length 24. Angle D O E is 45 degrees. The area within sector D O E is shaded.
What is the area of the shaded sector?
24π
45π
72π
576π
In the given circle, the area of the shaded sector is 72π, hence option C is correct.
The region inside the portion of the circle formed by two radii and an arc is known as the area of a sector. It only covers a small portion of the entire circle's surface.
To find the area of the shaded sector, use the formula:
According to the diagram in the question
OE is the radius
The central angel of the sector is 45⁰
A = θ/360 πr²
Put the values in the formula, we get
45 ÷ 60 × π × 24²
1/8 × π × 24 × 24
3 × 24 × π
= 72π
Thus, the area of the shaded sector is 72π.
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The question is in the picture please help thank youuuu!!!
The missing genotype in the punnett square are as follows:
BbbbWhat is a punnet square?A punnet square is a graphical representation used in genetics to determine the probability of an offspring expressing a particular genotype.
According to this question, a mother with the genotype 'Bb' (heterozygous) is crossed with a father with genotype 'bb' (homozygous recessive).
The cross between these two parents i.e. Bb × bb, is illustrated in the punnett square above. However, two of the genotype of the offsprings were missing. The possible offsprings' genotype from this cross are as follows:
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define tetragonal unit cell
Answer:
The tetragonal unit cell is distinguished by an axis of fourfold symmetry, about which a rotation of the cell through an angle of 90° brings the atoms into coincidence with their initial positions. The elements boron and tin can crystallize in tetragonal form, as can some minerals such as zircon.
Explanation:
whats an example of a low amount of force being applied to an object explain in 1-2 sentences.
An example of a low amount of force being applied to an object is as follows; a child pushing a barrel that is not moving.
What is force?Applied force is the force which is applied to an object by another object.
Ideally, a force is a physical quantity that denotes ability to push, pull, twist or accelerate a body. Work is kind of force that causes a body to move.
For example, a person pushing a barrel is an example of applied force. When the person pushes the barrel then there is an applied force acting upon the barrel.
However, when a child pushes against the barrel and it doesn't move, it can be said that a low amount of force is applied.
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The formula NaF would represent what type of bond?
a. Ionic
b. Covalent
c. metallic
d. James
What is the oxidation number of Boron? (2.2.1)
2+
2-
3+
3-
When a substance is reduced:
A. It is called the oxidizing agent
B. Some other substance must be reduced
C. It loses electrons
D. It is called the reducing agent
Answer:
Explanation:
Heat 2kg ice from -5c to 0c
In order to melt 2kg of ice the heat that is required is: 709.87 kJ
What is the specific heat energy that is required?The total heat required is gotten from the formula:
Total heat = Heat required to convert 2kg of ice to 2kg of water at 0℃ + Heat required to convert 2kg of water at 0℃ to 2kg of water at 5℃
Thus:
Heat = mh_fg + mCpΔt
We ae given that:
m(mass of ice) = 2kg
hfg (latent heat of fusion of ice) = 334kJ
Cp of water (specific heat) = 4.187 kJ/kg-k
Δt(temperature difference) = 5℃
Therefore,
Heat required = (2 × 334) + (2 × 4.187 × (5 − 0))
= 709.87 kJ
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Which functional group is within the compound shown below
The functional group within the compound is ketone.
Ketones are a common functional group in organic chemistry. Ketones have important physiological properties.
Ketones can be named using either the common system or the IUPAC system. In the common system, ketones names are created by naming the groups attached to the carbonyl carbon and then adding the word ketone.
In ketones, the carbonyl group has two hydrocarbon groups attached to it. These can be either aromatic rings or alkyl groups. Ketone does not have a hydrogen atom attached to the carbonyl group.
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Consider the balance redox reaction below
K2Cr2O7 + 7H2SO4 + 6KBr ----> 3Br2O + 4K2SO4 + Cr2(SO4)3 + 7H2O
WHich element is oxidized in the reaction?
A.) Br in KBr B.) S in H2S04
C.) H in H2SO4 D.) Cr in K2CR2O7
In the redox reaction, [tex]K_{2} Cr_{2} O_{7}[/tex] + 7[tex]H_{2} SO_{4}[/tex] + 6KBr → [tex]3Br_{2}O[/tex] + [tex]4K_{2} SO_{4}[/tex] + [tex]Cr_{2} (SO_{4})_{3}[/tex] + [tex]7H_{2}O[/tex], the element that is oxidized is Option A. Br in KBr.
In the given reaction, [tex]K_{2} Cr_{2} O_{7}[/tex], also known as potassium dichromate, is a strong oxidizing agent that causes oxidation of the other reactants. Oxidation refers to the loss of electrons by an atom or molecule. Similarly, reduction refers to the gain of electrons by an atom or molecule.
In [tex]K_{2} Cr_{2} O_{7}[/tex], the oxidation state of chromium (Cr) is +6. In the product, [tex]Cr_{2} (SO_{4})_{3}[/tex], the oxidation state of Cr is +3. Therefore, Cr has been reduced, meaning it has gained electrons and is not oxidized.
On the other hand, [tex]H_{2} SO_{4}[/tex], the oxidation state of sulfur (S) is +6. In the product, [tex]K_{2} SO_{4}[/tex], the oxidation state of S is +6. Therefore, S has not been oxidized or reduced.
Similarly, [tex]H_{2} SO_{4}[/tex], the oxidation state of hydrogen (H) is +1. In the product, [tex]H_{2}O[/tex], the oxidation state of H is 0. Therefore, H has been reduced, meaning it has gained electrons and is not oxidized.
Finally, in KBr, the oxidation state of Br is -1. In the product, [tex]Br_{2}O[/tex], the oxidation state of Br is +1. Therefore, Br has been oxidized, meaning it has lost electrons.
In conclusion, the element that oxidized in the given reaction is Br in KBr (Option A).
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express views on how the law , the citizen and community can proteand support victims of human rights violations?
Answer:
On the support of victims of human rights violation, the law should clearly state and express the repercussions of violating human rights. The citizen on the other hand should be well versed with human rights and should report any violator of human rights to the relevant authorities for immediate action to be taken.
Which must be kept in mind when determining if an explanation is correct?
whether people reading the explanation agree
the information that is on the Internet
that there may be more than one way to interpret data
whether a person of authority says it is correct
There may be more than one way to interpret data.
People need multiple ways to understand the information. This way, they can determine if an explanation is correct in case they don't understand.
Answer:hey ok so the answer is “ that there may be more than one way to interpret date” or just C
Explanation:
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PbI2 is sparingly soluble in water (Ksp = 8.7 x 10-9). Which two of the following statements are true?
- More solid will dissolve when 10 g of PbI2(s) is added to 1.0 L of water than when 5 g of PbI2(s) is added.
- Adding HNO3(aq) to a saturated solution of PbI2(s) will cause more solid to precipitate
- PbI2(s) will be more soluble in pure water than in a solution containing KI(aq)
- PbI2(s) powder will be more soluble in water than large crystals of PbI2(s)
- The solubility product of PbI2(s) will increase with increasing temperature
Two statements that are true are:
More solid will dissolve when 10 g of PbI2(s) is added to 1.0 L of water than when 5 g of PbI2(s) is added.
The solubility product of PbI2(s) will increase with increasing temperature.
1- More solid will dissolve when 10 g of PbI2(s) is added to 1.0 L of water than when 5 g of PbI2(s) is added.
This statement is true because the solubility of PbI2 is limited by its Ksp value. Therefore, the more solid PbI2 added, the closer the solution gets to being saturated and the more PbI2 will dissolve.
5-The solubility product of PbI2(s) will increase with increasing temperature.
This statement is true because the solubility of most ionic solids increases with increasing temperature. A higher temperature increases the kinetic energy of the solvent molecules, allowing them to better solvate and break apart the solid PbI2. As a result, more ions are available to react and the Ksp value increases.
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