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Resonance structures can be used to show the delocalization of electrons in a compound. The electrons shift between two or more different bonding positions, which leads to the development of different resonance structures. This helps to explain some of the chemical behavior of the compound and provide insight into its properties.

In order to show the delocalization of electron pairs, we can use curved arrows. Curved arrows show the movement of electrons in a reaction, which helps to explain how bonds are formed or broken. In this case, we will use curved arrows to show how electron pairs are delocalized between two different resonance structures.To illustrate this, let's consider an example with the molecule formaldehyde, H2CO. Here are two possible resonance structures for formaldehyde.In order to show the delocalization of electron pairs, we can draw curved arrows between the oxygen and carbon atoms. The curved arrows show the movement of electrons from the oxygen atom to the carbon atom, which helps to explain how the bonds in the molecule are formed.

One arrow from the oxygen lone pair to the carbon atom One arrow from the double bond to the oxygen atomThis shows the movement of electrons from the oxygen atom to the carbon atom, which helps to explain how the double bond is formed. The two resonance structures are related to each other by the movement of electrons between the oxygen and carbon atoms, which helps to explain the delocalization of electron pairs in the molecule.

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The effects of exposure were more pronounced in fish that had been raised in a less stressful environment, suggesting that environmental conditions can influence the impact of exposure to antidepressants.

1. The class of drugs being investigated in this study is antidepressants. They enter our waterways through excretion by individuals taking the medication, and disposal of unused medication into toilets or sinks that are connected to wastewater treatment plants.

2. C-start is an evasive maneuver that young fish use when they perceive a predator. This is important for larval fish survival because it helps them to avoid being eaten by predators.

3. In this investigation, researchers are testing two hypotheses. The first is that exposure to low levels of antidepressants can affect larval fathead minnows' behavior, and the second is that the effects of exposure will be more pronounced in fish that have been raised in a less stressful environment.

4. The researchers found that exposure to antidepressants at levels found in waterways can have a significant impact on the behavior of larval fathead minnows. Specifically, they found that the fish exposed to antidepressants were less likely to respond to the presence of predators, which could increase their risk of being eaten.

They also found that the effects of exposure were more pronounced in fish that had been raised in a less stressful environment, suggesting that environmental conditions can influence the impact of exposure to antidepressants.

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The pH will increase. Adding sodium hydrogen carbonate will increase the concentration of hydroxide ions, which will react with the carbonic acid to form carbonate and bicarbonate ions.

pH (potential of Hydrogen) is a measure of the acidity or alkalinity of a solution. It is measured on a logarithmic scale from 0 to 14, with 7 being neutral. A pH below 7 is considered acidic, while a pH above 7 is considered basic or alkaline. The lower the pH, the more acidic the solution is. The higher the pH, the more basic or alkaline the solution is. A pH of 0 is the most acidic and a pH of 14 is the most basic or alkaline. pH is important in many different fields, such as biology, chemistry, and medicine. It is used to measure the acidity of water, soil, and other substances, and is also used to monitor water quality.

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Answer:

the sand dune would become flattened and eventually turn into sedementary rock

Human activity can have a significant impact on the balance of acids and bases in the environment are Acid rain, Ocean acidification, and Agricultural practices.

Acid rain is caused by the release of sulfur dioxide (SO2) and nitrogen oxides (NOx) into the atmosphere from the burning of fossil fuels. These gases react with water vapor in the atmosphere to form acids, which can then fall to the earth as rain, snow, or fog. Acid rain can have a detrimental effect on the environment, including the acidification of lakes and streams, the damaging of forests and crops, and the erosion of buildings and monuments.

The burning of fossil fuels also releases carbon dioxide (CO2) into the atmosphere, which can be absorbed by the oceans. This can lead to a decrease in the pH of the oceans, which can have a negative impact on marine life, including the bleaching of coral reefs and the dissolution of the shells of shellfish.

The use of fertilizers in agriculture can lead to the release of nitrous oxide (N2O) into the atmosphere, which can contribute to the formation of acid rain. Additionally, the use of pesticides and herbicides can lead to the release of chemicals into the environment, which can also affect the balance of acids and bases.

Overall, human activity can have a significant impact on the balance of acids and bases in the environment, and it is important to take steps to reduce our impact on the environment in order to maintain a healthy balance of acids and bases.

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The specific heat of the metal is 0.30J/g°C.

The specific heat capacity is defined as the quantity of heat (J) absorbed per unit mass (kg) of the material when its temperature increases 1 K (or 1 °C), and its units are J/(kg K) or J/(kg °C).

Step 1: Data given

Mass of metal = 75.0 g

Temperature of the metal = 65°C

Mass of water = 100.0 g

Temperature of the water = 20.0°C

Final temperature of the water = 22.3 °C

The specific heat of water is 4.184 J/g°C

Step 2: Calculate the specific heat of metal

Qlost = -Qgained

Q= m xCxΔT

Qmetal = -Qwater

m(metal) x c(metal) x ΔT(metal) = - m(water) x c(water) x ΔT(water

⇒m(metal) = the mass of metal = 75.0 g

⇒c(metal) = the specific heat of the metal = ?

⇒ΔT = The change of temperature = 22.3 - 65°C = -42.7 °C

⇒m(water) = the mass of water = 100.0 g grams

⇒c(water) = the specific heat of water = 4.186 J/g°C

⇒ΔT(water) = T2 - T1 = 22.3 - 20.0 = 2.3 °C

75.0 g x c(metal) x -42.7 °C= -100.0 g x  4.186 x 2.3

75.0 g x c(metal) x -42.7 °C = −962.78

c(metal) = 0.3006338798J/g°C =0.30J/g°C

The specific heat of the metal is 0.30J/g°C.

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Answer:

open system

Explanation:

An open system is a system in which both energy and matter are exchanged with the surroundings.

The percent yield of indigo : 79.6%

Percent yield is the comparison of the amount of product obtained from a reaction with the amount you calculated

General formula:

Percent yield = (Actual yield / theoretical yield )x 100%

An actual yield is the amount of product actually produced by the reaction. A theoretical yield is the amount of product that you calculate from the reaction equation according to the product and reactant coefficients

Reaction

2C₁₀H₁₁NO₄ + 2H₂O → C₁₆H₁₀N₂O₂ + 2C₂H₄O₂ + 4H₂O

Actual yield = 1.87 g

Theoretical yield = 2.35 g

The percent yield of indigo :

\(\tt \%yield=\dfrac{actual}{theoretical}\times 100\%\\\\\%yield=\dfrac{1.87}{2.35}\times 100\%=\boxed{\bold{79.6\%}}\)

The number of moles of gas is the same on both sides, the change in volume will not affect the equilibrium position of the reaction. The answer is B) There is no change because there are the same number of moles of gas on both sides.

To determine the change that will occur when the container is shrunk from 9.0 L to 3.0 L for the given reaction:

51.8 kJ + H₂(g) + I₂(g) → 2HI(g)

We need to consider the number of moles of gas on each side of the reaction.

On the left side, there are 2 moles of gas (H₂ and I₂), while on the right side, there are 2 moles of gas (2HI). Both sides have an equal number of moles of gas.

Therefore, the correct answer is B) There is no change because there are the same number of moles of gas on both sides.

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Answer:

:D

Explanation:

8. D. All of the above

9. C. Mechanical weathering

10. D. All of the above

Answer:

8. D

9. A

10. D

Answer:

Final Temp = 23.92°C

Explanation:

ΔH(total) = (m·c·ΔT)ice + (m·ΔH(f))melt'g + (m·c·ΔT)water

2182.5j = (5g)(2.092j/g·°C)(1°C) + (5g)(334.56j/g) + (5g)(4.184j/g·°C)(ΔT)

(2182.5 - 10.46 - 1672.8)j = 20.92j/°C·ΔT

ΔT = (2182.5 - 10.46 - 1672.8)j / 20.92j/°C = 23.92°C

Since the melting ice starts and ends at 0°C and is then warmed to 23.92°C then the temperature change is also the final temp of the water based upon given energy input values.

Answer:

u

r

m

o

m

Explanation:

To calculate the mass of silicon dioxide needed, we need to use its molar mass and the given number of moles.

The molar mass of silicon dioxide (SiO2) can be calculated by adding the atomic masses of silicon (Si) and two oxygen (O) atoms:

Molar mass of Si = 28.09 g/mol

Molar mass of O = 16.00 g/mol

Molar mass of SiO2 = (28.09 g/mol) + 2(16.00 g/mol) = 60.09 g/mol

Now, we can calculate the mass of silicon dioxide needed:

Mass = Number of moles × Molar mass

Mass = 3.002 mol × 60.09 g/mol

Mass ≈ 180.3 g

Therefore, the student should obtain approximately 180.3 grams of silicon dioxide for the experiment.

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If 4.00 mL of vinegar needs 43.5 mL of 0.150 m NaOH  to reach the equivalence point in a titration, The grams of the acetic acid is 119.9 g.

Given that :

The molarity of NaOH = 0.150 M

The volume of NaOH = 43.5 mL = 0.0435 L

The moles = molarity × volume

                 = 0.150 × 0.0435

                 = 0.0065 mol

At equivalence point ,

Moles of CH₃COOH = moles of NaOH

The molarity of the CH₃COOH = moles / volume

                                                   = 0.0065 / 0.004

                                                   = 1.625 mol

Volume of  CH₃COOH = 1.50 × 0.946353

                                     = 1.230 L

The mass of the Acetic acid = 1.625 × 1.230 × 60

                                               = 119.9 g

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The statement that best describes the noble gases is "they have a full outer electron shell."

The noble gases, also known as Group 18 elements or inert gases, are a group of elements on the periodic table that include helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). These elements are characterized by their full outer electron shell, which is the highest energy level of electrons in an atom.

A full outer electron shell means that the noble gases have achieved a stable electron configuration, making them chemically inert or unreactive. This is because they have the maximum number of electrons allowed in their outer shell, making it energetically unfavorable for them to gain or lose electrons to form chemical bonds with other elements. Therefore, the noble gases do not easily combine or react with other elements.

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Answer:

CH4 - Methane

B2Si - Diboron monosilicide

N2O5 - Dinitrogen pentoxide

CO2 - Carbon dioxide

Explanation:

When it comes to naming covalent compounds, there are several rules.

The name is derived based on the formula. For example, N2O5. The first element is nitrogen. To the name of the element, you add the prefix that tells us how many of its atoms are in the compound. In this case, there are two atoms, which means that the prefix will be di- (dinitrogen). The second element is oxygen. You are supposed to take only the root of the second element's name and then add the prefix denoting the number of its atoms and the suffix -ide (pentoxide). This is how we'll get dinitrogen pentoxide.

The only exception is methane (CH4), which is an organic compound. Organic compounds are named using the IUPAC nomenclature.

Answer: Sn (s)

Explanation:

Oxidation is losing electrons and Sn(s) charge is zero and Sn in the SnCl -2 ion is +4  so it lost 4 electrons

Answer:

C. H2O is the base and H3O+ is the conjugate acid

Explanation:

According to Bronsted-Lowry acid-base theory, an acid is a substance that loses an hydrogen ion or proton (H+) while a base is a substance that gains an hydrogen ion (H+) or proton. Furthermore, this theory states that, the molecule formed when an acid donates its proton is called the CONJUGATE BASE, while the molecule formed when the base accepts proton is called CONJUGATE ACID.

In this question, the following equation is given:

NH4+(aq) + H2O(aq) ⇌NH3(aq) + H3O+ (aq)

Water (H2O) is the base in this equation because according to Bronsted-Lowry acid-base theory, it accepts an hydrogen ion (H+) while hydroxonium ion (H3O+) is the conjugate acid.

First, we have to know the rules to recognize significant numbers:

Zeros between two non-zero digits ARE significant.

are

All non-zero numbers are significant.

Trailing zeros to the right of the decimal are significant.

Leading zeros are not significant.

Trailing zeros in a whole number with the decimal shown are significant.

Trailing zeros in a whole number with no decimal shown are not significant.

After these rules, we can say that 890 has only 2 significant numbers.

Answer: 2 significant digits

The final temperature of the water, given that the cube of brass heated to 95 degrees celsius was immersed in it is 80.6 °C

First, we shall determine the mass of the brass. Details below:

Mass = density × volume

Mass of brass = 88.25 × 10.684

Mass of brass = 939.686 g

Finally, we shall determine the equilibrium temperature in order to obtain the final temperature of the water. Details below:

Heat loss by brass = Heat gain water

MC(T - Tₑ) = MᵥᵥCᵥᵥ(Tₑ - Tᵥᵥ)

939.686 × 0.362 (95 - Tₑ) = 20 × 4.18(Tₑ - 22)

340.166332(95 - Tₑ) = 83.6 (Tₑ - 22)

Clear bracket

32315.80154 - 340.166332Tₑ = 83.6Tₑ - 1839.2

Collect like terms

32315.80154 + 1839.2 = 83.6Tₑ + 340.166332ₑ

34155.00154 = 423.766332Tₑ

Divide both side by 423.766332

Tₑ = 34155.00154 / 423.766332

Tₑ = 80.6 °C

Now, the equilibrium temperature is 80.6 °C

Thus, we can conclude that the final temperature of the water is 80.6 °C

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Answer:

Seven Atoms

Explanation:

It has a total of three elements and seven atoms. Another use that aluminum hydroxide has is it treats the symptoms of too much stomach acid. Some examples of what it treats are: upset stomach, heartburn, and acid indigestion.

The standard free energy change (∆Gº') is the energy released when the products are created from the reactants. The (∆Gº') at 298 K is -5.40kJ.

The standard free energy change is given by the sum of the standard free energies of the products subtracted from the sum of the standard free energies of the reactants, given as,

ΔG = ∑nΔG°products − ∑mΔG°reactants

Given,

ΔG°(NO₂) = 51.84 kJ/mol

ΔG°(N₂O₄) = 98.28 kJ/mol

Substituting values:

ΔG = ∑nΔG°products − ∑mΔG°reactants

= ΔG°(N₂O₄) − 2ΔG°(NO₂)

= 98.28 − 2(51.84)

= - 5.4

Therefore, -5.40 kJ is the standard free energy.

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The percent yield when 8.00 g of NaI are produced from a mixture of 10.0 g I₂ and 10.0 g NaOH is 67.7%.

To calculate the percent yield, first determine the theoretical yield and then compare it to the actual yield. In this case, 8.00 g of NaI are produced (actual yield).

1. Write the balanced equation for the reaction:
2NaOH + I₂ → 2NaI + H₂O

2. Calculate the moles of each reactant:
I₂: (10.0 g) / (253.8 g/mol) = 0.0394 mol
NaOH: (10.0 g) / (40.0 g/mol) = 0.250 mol

3. Determine the limiting reactant:
For I₂: (0.0394 mol) / (1 mol I₂) = 0.0394
For NaOH: (0.250 mol) / (2 mol NaOH) = 0.125

Since 0.0394 < 0.125, I₂ is the limiting reactant.

4. Calculate the theoretical yield of NaI:
(0.0394 mol I₂) x (2 mol NaI / 1 mol I₂) x (149.9 g/mol NaI) = 11.81 g NaI

5. Calculate the percent yield:
Percent yield = (actual yield / theoretical yield) x 100
Percent yield = (8.00 g / 11.81 g) x 100 = 67.7%

The percent yield for this reaction is 67.7%.

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The population density of the hawks is 6.73 hawks/sq. km.

Population density is defined as the number of individuals of a species per unit area.

Population density = Number of individuals / Area

In this problem, we are given:

Substituting these values in the formula, we get:

Population density = 148 hawks / 22 sq. km

Simplifying this expression, we get:

Population density = 6.73 hawks/sq. km

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Answer:

Explanation:

Inclined Plane: Easy Lifting. An inclined plane is simply an even, sloping surface. ...

Wedge: Splitting and Separating. ...

Screw: Fastening and Moving. ...

Lever: Multiplying Force. ...

Wheel and Axle: Rolling. ...

Pulley: Hoisting Heavy Loads. ...

Scissors: Making the Cut. ...

Hand Truck: Mover's Friend.

Answer:

1.3 M

Explanation:

The formula mass of lithium fluoride is 7+19=26 g/mol. This means that in 52 grams of LiF, there is 2 moles.

Molarity = (moles of solute)/(liters of solution), so the answer is 2/1.5 = 1.3 M

Nuclear fusion: this is the joining of two small atomic nuclei into one nucleus. Nuclear fission: this is the splitting of one large atomic nucleus into smaller fragments.

Answer:

238 is the answer

Explanation:

238 - 146 + 3 = 95

Americium (95Am) is an element that has 95 protons and 146 neutrons in its nucleus of an atom.

Americium is an element that has 95 protons and 146 neutrons. Its symbol is Am. Its atomic mass is 241 amu which is get by addition of proton and neutron.

So we can conclude that Americium (95Am) is an element that has 95 protons and 146 neutrons in its nucleus of an atom.

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