Can someone please help me

Answer:

b) Li2S(aq)+Pb(NO3)2(aq)

e) K2S(aq)+Sn(NO3)4(aq)

Explanation:

they are the only two of the options that contain a sulfide ion (S) therefore they are the only ones that could be considered in the question.

b) Li2S(aq)+Pb(NO3)2(aq)

e) K2S(aq)+Sn(NO3)4(aq)

Answer:Molecular Formula SO2

Hybridization Type sp2

Bond Angle 119o

Geometry V-Shaped or Bent

Explanation:

hope this helped <3

Answer:

A mixture

Explanation:

Since they add multiple ingrediants and then stir them that makes it a mixture because they are mixing it.

Hope this helps :)

Answer:

the more sun there is, the taller the plant

Explanation:

The net ionic equation for the reaction between potassium sulfide and magnesium iodide is S2- + Mg2+ -> MgS, as the potassium and iodide ions are spectator ions and do not participate in the reaction.

To determine the net ionic equation for the reaction between potassium sulfide (K2S) and magnesium iodide (MgI2), we first need to identify the ions present in each compound and then determine the products formed when they react.

Potassium sulfide (K2S) dissociates into two potassium ions (K+) and one sulfide ion (S2-):

K2S -> 2K+ + S2-

Magnesium iodide (MgI2) dissociates into one magnesium ion (Mg2+) and two iodide ions (I-):

MgI2 -> Mg2+ + 2I-

Now, we need to determine the possible products when these ions combine. Since potassium (K+) has a +1 charge and iodide (I-) has a -1 charge, they can combine to form potassium iodide (KI):

K+ + I- -> KI

Similarly, magnesium (Mg2+) and sulfide (S2-) can combine to form magnesium sulfide (MgS):

Mg2+ + S2- -> MgS

Now, we can write the complete ionic equation by representing all the ions present before and after the reaction:

2K+ + S2- + Mg2+ + 2I- -> 2KI + MgS

To obtain the net ionic equation, we remove the spectator ions, which are the ions that appear on both sides of the equation and do not participate in the actual reaction. In this case, the spectator ions are the potassium ions (K+) and the iodide ions (I-).

Thus, the net ionic equation for the reaction between potassium sulfide and magnesium iodide is:

S2- + Mg2+ -> MgS

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5. There are 5.67 grams of HBr dissolved in 700 mL of the solution with pH of 2.

6. There are 1000 times more hydrogen ions in a solution with a pH of 3 than in a solution with a pH of 6.; option D.

The grams of HBr dissolved in 700 mL of a solution with pH of 2 is determined as follows;

pH = -log[H+]

2 = -log[H+]

[H+] = 10⁻² mol/L

HBr is a strong acid and dissociates completely in water to give H+ and Br- ions as follows:

HBr → H+ + Br-

The concentration of HBr in the solution will then be equal to the concentration of H+ ions.

[HBr] = 10⁻² mol/L

The mass of HBr is then determined using the formula:

The molar mass of HBr is 80.91 g/mol.

mass = 10⁻² mol/L x 0.7 L x 80.91 g/mol

mass = 5.67 g

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The heat required is to convert 75.0 g of C₂Cl₃F₃ from a liquid at 13.60 ∘C to a gas at 76.00 ∘C is 17.55 kJ.

To solve this problem, we need to consider the different steps involved in the process of converting 75.0 g of C₂Cl₃F₃ from a liquid at 13.60 ∘C to a gas at 76.00 ∘C;

Heating the liquid C₂Cl₃F₃ from 13.60 ∘C to its boiling point at 47.6 ∘C, Vaporizing the liquid C₂Cl₃F₃ at its boiling point, and heating the resulting gas from 47.6 ∘C to 76.00 ∘C

Now, we can use the equations to calculate the heat required for each step;

q₁ = m × C₁ × ΔT₁

where q₁ is the heat required, m is the mass of C₂Cl₃F₃, C₁ is the specific heat of C₂Cl₃F₃(l), and ΔT₁ is the temperature change from 13.60 ∘C to 47.6 ∘C.

q₁ = 75.0 g × 0.91 J/g⋅K × (47.6 ∘C - 13.60 ∘C)

= 2466 J

q₂ = n × ΔHvap

where q₂ is the heat required, n is the number of moles of C₂Cl₃F₃, and ΔHvap is the heat of vaporization of C₂Cl₃F₃.

n = m/M

= 75.0 g / 137.37 g/mol

= 0.5464 mol

q₂ = 0.5464 mol × 27.49 kJ/mol

= 15.038 kJ

q₃ = m × C₂ × ΔT₂

where q₃ is the heat required, m is the mass of C₂Cl₃F₃(g), C₂ is the specific heat of C₂Cl₃F₃(g), and ΔT₂ is the temperature change from 47.6 ∘C to 76.00 ∘C.

m = n × M

= 0.5464 mol × 137.37 g/mol

= 75.0 g

q₃ = 75.0 g × 0.67 J/g⋅K × (76.00 ∘C - 47.6 ∘C)

= 1446 J

The total heat required is the sum of the heats required for each step;

\(q_{total}\)= q₁ + q₂ + q₃

= 2466 J + 15.038 kJ + 1446 J

= 17.55 kJ

Therefore, the total heat required is 17.55 kJ.

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Answer:

0.375 J/g°C

Brass

Explanation:

To identify the unknown metal, you first need to calculate the specific heat capacity using the following equation:

Q = mcΔT

In this equation,

-----> Q = heat energy (J)

-----> m = mass (g)

-----> c = specific heat capacity (J/g°C)

-----> ΔT = change in temperature (°C)

You can find the specific heat capacity by plugging the given values into the equation and simplifying to find "c".

Q = 150 J                        c = ? J/g°C

m = 20.0 g                     ΔT = 50°C - 30°C = 20°C

Q = mcΔT                                           <----- Given equation

150 J = (20.0 g)c(20°C)                      <----- Insert values

150 J = (400 g°C)c                             <----- Multiply 20.0 g and 20°C

0.375 J/g°C = c                                  <----- Divide both sides by 400 g°C

The specific heat capacity of the unknown metal is 0.375 J/g°C. According to my research, there is no metal with this exact specific heat capacity. However, the closest I could find was brass (0.377 J/g°C).

At equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

1: Write the balanced chemical equation:

\(C_O\)(g) + \(Cl_2\)(g) ⟶ \(C_OCl_2\)(g)

2: Set up an ICE table to track the changes in moles of the substances involved in the reaction.

Initial:

\(C_O\)(g) = 0.3500 mol

\(Cl_2\)(g) = 0.05500 mol

\(C_OCl_2\)(g) = 0 mol

Change:

\(C_O\)(g) = -x

\(Cl_2\)(g) = -x

\(C_OCl_2\)(g) = +x

Equilibrium:

\(C_O\)(g) = 0.3500 - x mol

\(Cl_2\)(g) = 0.05500 - x mol

\(C_OCl_2\)(g) = x mol

3: Write the expression for the equilibrium constant (Kc) using the concentrations of the species involved:

Kc = [\(C_OCl_2\)(g)] / [\(C_O\)(g)] * [\(Cl_2\)(g)]

4: Substitute the given equilibrium constant (Kc) value into the expression:

1.2 x \(10^3\) = x / (0.3500 - x) * (0.05500 - x)

5: Solve the equation for x. Rearrange the equation to obtain a quadratic equation:

1.2 x \(10^3\) * (0.3500 - x) * (0.05500 - x) = x

6: Simplify and solve the quadratic equation. This can be done by multiplying out the terms, rearranging the equation to standard quadratic form, and then using the quadratic formula.

7: After solving the quadratic equation, you will find two possible values for x. However, since the number of moles cannot be negative, we discard the negative solution.

8: The positive value of x represents the number of moles of \(Cl_2\)(g) at equilibrium. Substitute the value of x into the expression for \(Cl_2\)(g):

\(Cl_2\)(g) = 0.05500 - x

9: Calculate the value of \(Cl_2\)(g) at equilibrium:

\(Cl_2\)(g) = 0.05500 - x

\(Cl_2\)(g) = 0.05500 - (positive value of x)

10: Calculate the final value of \(Cl_2\) (g) at equilibrium to get the answer.

Therefore, at equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

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Answer:

Cl2 at 250 K < Cl2 at 300 K < H2S at 250 K < H2S at 300 K.

Explanation:

The correct order of diffusion rate of chlorine is

\(\rm Cl_2\;at\; 250 K < Cl_2\; at\; 300 K < H_2S \;at\; 250 K < H_2S\; at\;300\; K.\)

The diffusion rate depends upon various factors such as concentration gradient, the amount of surface area, and the distance travelled by the gas particles.

We can calculate the rate of diffusion by the amount of gas passing by an area unit of time.

Thus, the correct order is

\(\rm Cl_2\;at\; 250 K < Cl_2\; at\; 300 K < H_2S \;at\; 250 K < H_2S\; at\;300\; K.\)

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Answer:

b

Explanation:

The statement that is true of a Lewis base is that a Lewis base donates electron pairs (option A).

A Lewis base is any nucleophylic compound that can donate a pair of electrons and form a coordinate covalent bond.

On the other hand, a Lewis acid is any electrophylic compound that can accept a pair of electrons and form a coordinate covalent bond.

This means that a Lewis base can donate a pair of electrons to a Lewis acid to form a product containing a coordinate covalent bond. This product is also referred to as a Lewis adduct.

Therefore, option A is correct about Lewis base

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Answer:

B.a fire hydrant

hope it helps!

Answer:

a veterinarian

Explanation:

i think

Answer

Molarity (C) = 0.455 mol/L

Explanation

Given:

Mass of H2SO4 = 78 g

Molar mass of H2SO4 = 98.0 g/mol

Volume of the solution = 1.75 L

Required: The molarity of the solution

Solution

Step 1: Calculate the number of moles of moles of H2SO4

n = m/M where n is the moles, m is the mass and M is the molar mass

n = 78 g/98.0 g/mol

n = 0.796 mol

Step 2: Calculate the molarity of the solution

C = n/V where C is the molarity/concentration, and V is the volume of the solution

C = 0.796 mol/1.75 L

C = 0.455 mol/L

Answer:

i dont knoiwxplanation:

Answer:

YALL ITS A AND C

Explanation:

The potential energy is converted to kinetic energy as the ball rolls down the hill.

The energy that is conserved or stored in a substance or object is known as potential energy. The position, organization, or state of the object or substance determines the amount of stored energy.

Potential energy mostly comes in two forms: The potential energy of gravity and Potential elastic energy.

The energy an object has as a result of motion is known as kinetic energy. A force must be applied to an object to accelerate it. We must put in effort to apply force.

Therefore, The potential energy is converted to kinetic energy as the ball rolls down the hill.

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Answer:

Plant cells contain two organelles that are essential for their functioning. These are the chloroplasts and the vacuoles. The chloroplasts are the organelles responsible for photosynthesis, which involves converting light energy from the sun into chemical energy in the form of glucose. Without chloroplasts, plants would not be able to produce their own food. The vacuoles are large organelles filled with fluid that serve to store nutrients and other materials. Vacuoles also help to maintain the turgor pressure of the cell, which is the pressure that helps to keep the cell rigid and prevents it from collapsing. Without vacuoles, plant cells would not be able to remain rigid and would collapse, leading to the death of the plant.

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Taking into account the reaction stoichiometry, 45.5625 grams of HCl can be produced when 18 grams of PCl₅ reacts with 18 grams of H₂0.

In first place, the balanced reaction is:

PCl₅ + 4 H₂O → 5 HCl + H₃PO₄

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction.

To determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 66.45 grams of PCl₅ reacts with 72 grams of H₂O, 18 grams of PCl₅ reacts with how much mass of H₂O?

mass of H₂O= (18 grams of PCl₅× 72 grams of H₂O) ÷66.45 grams of PCl₅

mass of H₂O= 19.50 grams

But 19.50 grams of H₂O are not available, 18 grams are available. Since you have less mass than you need to react with 18 grams of PCl₅, H₂O will be the limiting reagent.

Considering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 72 grams of H₂O form 182.25 grams of HCl, 18 grams of H₂O form how much mass of HCl?

mass of HCl= (18 grams of H₂O× 182.25 grams of HCl)÷ 72 grams of H₂O

mass of HCl= 45.5625 grams

Finally, 45.5625 grams of HCl can be produced when 18 grams of PCl₅ reacts with 18 grams of H₂0.

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Glycerol has the chemical formula C3H8O3. Because it includes three different kinds of hydroxyls, or alcohol, glycerol seems to be a trihydric alcohol. In tropical and olive oil, it is the predominant triglyceride.

Glycerol serves as a hydrating, thickening agent, solvent, and lubricate in many personal hygiene products, including dentistry, child services, shaved foam, and soaps. Glycerol is also used in the pharmaceutical industry due to its absorbent properties.

A polyol is a complex carbohydrate, and prostaglandin is one of several sugar alcohols, along with sorbitol and isomaltulose. Similar unlike vodka, which I've already talked about, glycerin really does have a delicious taste, but neither the body nor blood sugar absorb it as sugar.

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The number of moles of the water produces by the 1.3 moles of O₂ is 1.00 mol of H₂O. The correct option is C.

The chemical equation is as :

2C₄H₁₀  +  13O₂  ---->  8CO₂ + 10H₂O

The moles of the O₂ = 1.3 moles H₂O

The molar mass of the O₂ = 32 g/mol

2 moles of the C₄H₁₀ produces the 10 moles of the water,

13 moles of O₂ produces the 10 moles of H₂O

The moles of the H₂O = (10/13) × 1.3

The moles of the H₂O = 1 mol

The number of moles of the water is 1 mol of the H₂O and the moles of the oxygen that is O₂ is the 1.3 moles.. Therefore, the correct option is C.

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The theoretical yield of Acetylsalicylic acid is found out to be: 3.01 grams.

The limiting reagent is a substance that prevents a chemical reaction from occurring completely.

When a limiting reagent is used in a chemical reaction, the atoms, molecules, or ions of the other reactant that it (the limiting reagent) reacts with will either stay free or unreacted.

Popular compounds called acids and bases interact with one another to create salt and water. The Latin word "acere," which meaning "sour," is where the term "acid" originates.

According to the problem, we have 2.31 grams of salicylic acid. We need to determine the theoretical yield of acetylsalicylic acid.

The molar mass of salicylic acid is 138.12 g/mol. Therefore, the number of moles of salicylic acid we have is:

n = mass / molar mass

n = 2.31 g / 138.12 g/mol

n = 0.0167 mol

According to the balanced equation, 1 mole of salicylic acid reacts with 1 mole of acetic anhydride to produce 1 mole of acetylsalicylic acid. Therefore, the number of moles of acetylsalicylic acid produced is also 0.0167 mol.

The molar mass of acetylsalicylic acid is 180.16 g/mol. Therefore, the theoretical yield of acetylsalicylic acid is:

mass = n x molar mass

mass = 0.0167 mol x 180.16 g/mol

mass = 3.01 g

Therefore, the theoretical yield of acetylsalicylic acid is 3.01 grams.

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917Kg/m³ is the density of 50,000 m³ iceberg of mass of 45,850,000kg. Grams per cubic centimeter are a typical unit of measurement for density.

Density is the mass of a specific material per unit volume. d = M/V, in which d is density, M is weight, and V is volume, is the formula for density. Grams per cubic centimeter are a typical unit of measurement for density. For instance, whereas Earth has a density of 5.51 grams per square centimeter, water has a density of 1 gram per cubic centimeter.

Another way to state density is in kilograms per cubic meter. For instance, air weighs 1.2 pounds per cubic metre. In textbooks and manuals, the densities of typical solids, liquids, as well as gases are stated.

density= mass/ volume

         = 45,850,000 /50,000

         = 917Kg/m³

Therefore, 917Kg/m³ is the density of 50,000 m³ iceberg of mass of 45,850,000kg.

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Answer:

D H2PO4– + HPO42–

Explanation:

The acid dissociation constant for \(\mathbf{H_3PO_4 , H_2PO^{-}_4 , HPO_4^{2-}}\) are \(\mathbf{7\times 10^{-3}, \ \ 8\times 10^{-8} ,\ \ 5\times 10^{-13}}\) respectively.

\(\mathbf{pka (H_3PO_4) = -log (7\times 10^{-3} )=2.2}\)

\(\mathbf{pka (H_2PO_4^-) = -log (8\times 10^{-8} )=7.1}\)

\(\mathbf{pka (HPO_4^{2-}) = -log (5\times 10^{-13} )=12.3}\)

The reason while option D is the best answer is that, the value of pKa for both

\(\mathbf{H_2PO^{-}_4 ,\ \& \ HPO_4^{2-}}\) lies on either side of the desired pH of the buffer. This implies that one is slightly over and the other is slightly under.

Using Henderson-Hasselbach equation:

\(\mathbf{pH = pKa + log \Big( \dfrac{HPO_4^{2-}}{H_2PO_4^-} \Big)}\)

The compounds that are used for the formulation of the pH 9 buffer are \(\rm H_2PO_4^-\;and\;HPO_4^+\). Thus, option D is correct.

The buffers are the solutions of acids and base of appropriate pH, that are able to limit the change in pH in the reaction mixture.

The buffer pH is adjusted with the compounds that has been able to add base or acid to the solution.

For the formulation of buffer of specific pH, the acid and base solutions are required.

The compounds that are used for the formulation of the pH 9 buffer are \(\rm H_2PO_4^-\;and\;HPO_4^+\), as they are able to provide acid and base to the solution.

Thus, option D is correct.

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Yes, that statement is generally correct. A scientific law is a statement that describes a phenomenon or pattern in nature, often expressed mathematically, without attempting to explain why it occurs. A scientific theory, on the other hand, is a well-substantiated explanation for a set of phenomena, based on empirical evidence and scientific reasoning.

A scientific law summarizes what happens in a particular situation, often in the form of an equation or formula, whereas a scientific theory attempts to explain why it happens.

For example, the law of gravity describes the attraction between masses, but it does not explain why this attraction occurs. In contrast, the theory of general relativity attempts to explain the underlying principles of gravity, including its effects on the curvature of space-time.

It's worth noting that both scientific laws and scientific theories are based on empirical evidence, but they serve different purposes in scientific inquiry. Laws describe what happens in a particular situation, while theories attempt to explain why it happens.

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Answer: The volume of the sample after the reaction takes place is 29.25 L.

Explanation:

The given reaction equation is as follows.

\(OF_{2}(g) + H_{2}O(g) \rightarrow O_{2}(g) + 2HF(g)\)

So, moles of product formed are calculated as follows.

\(\frac{3}{2} \times 0.17 mol \\= 0.255 mol\)

Hence, the given data is as follows.

\(n_{1}\) = 0.17 mol,      \(n_{2}\) = 0.255 mol

\(V_{1}\) = 19.5 L,         \(V_{2} = ?\)

As the temperature and pressure are constant. Hence, formula used to calculate the volume of sample after the reaction is as follows.

\(\frac{V_{1}}{n_{1}} = \frac{V_{2}}{n_{2}}\)

Substitute the values into above formula as follows.

\(\frac{V_{1}}{n_{1}} = \frac{V_{2}}{n_{2}}\\\frac{19.5 L}{0.17 mol} = \frac{V_{2}}{0.255 mol}\\V_{2} = \frac{19.5 L \times 0.255 mol}{0.17 mol}\\= \frac{4.9725}{0.17} L\\= 29.25 L\)

Thus, we can conclude that the volume of the sample after the reaction takes place is 29.25 L.

Answer:

0,

Explanation:

if n was 2, then 1,0,-1

To graph the function g(x) = f(-x), you can start with the graph of f(x) and then reflect it about the y-axis.

To find the graph of the function g(x) = f(-x), we can start with the graph of the function f(x) and then reflect it about the y-axis.

If the graph of f(x) is symmetric with respect to the y-axis, meaning it is unchanged when reflected, then g(x) = f(-x) will have the same graph as f(x).

However, if the graph of f(x) is not symmetric with respect to the y-axis, then g(x) = f(-x) will be a reflection of f(x) about the y-axis.

In either case, the resulting graph of g(x) = f(-x) will be symmetric with respect to the y-axis.

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Answer:

The volume of Component 1 is 36 cubic inches.

Explanation:

To calculate the volume of a composite solid, we need to determine the individual volumes of the different components and then add them together.

In this case, the composite solid consists of multiple components with the following dimensions:

Component 1:

Length: 4 inches

Width: 3 inches

Height: 3 inches

To find the volume of Component 1, we multiply the length, width, and height together:

Volume of Component 1 = Length x Width x Height = 4 in x 3 in x 3 in = 36 cubic inches

Therefore, the volume of Component 1 is 36 cubic inches.

Please provide the dimensions of the remaining components of the composite solid, and I will calculate the total volume by summing up the individual volumes.

We can produce more products by;

A. Increasing the concentration of H₂ gas in the reaction vessel

B. Decreasing the temperature in the reaction vessel

C. Removing the H₂O from the reaction vessel as it forms

Water is created through an exothermic process. Heat energy is released when hydrogen gas (H2) and oxygen gas (O2) mix to make water (H2O). An exothermic reaction is characterized by this energy release.

The reaction's overall energy change is negative, which shows that energy is released. The reaction is exothermic because the extra energy is released as heat into the environment.

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Missing parts;

Water can be made using the reversible reaction shown. Which change would

keep this reaction from shifting to form more of the product?

2H₂+022H₂O + energy

A. Increasing the concentration of H₂ gas in the reaction vessel

B. Decreasing the temperature in the reaction vessel

C. Removing the H₂O from the reaction vessel as it forms

D. Increasing the temperature in the reaction vessel