What is most misleading about the contour map shown below?




The contour interval is too large to see much detail in the landscape.

The contour interval is too small, making the map hard to read.

The contour interval is inconsistent.

There is nothing wrong with the map.

Cellular Respiration is an Exothermic reaction as the product is ATP (energy)

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Answer:

Exothermic reaction because the product produced is ATP (energy)

Explanation:

Answer:

40 atm

Explanation:

Boyle’s law states that for a fixed amount of gas the pressure is inversely proportional to the volume of the gas at constant temperature.

P1V1 = P2V2

Where P1 is pressure and V1 is volume at the first instance

And P2 is pressure and V2 is volume at the second instance

Substituting the values in the equation

2.0 atm x 200 mL = P2 x 10 mL

P2 = 40 atm

The new pressure is 40 atm

The new pressure of the helium gas is 40 atm.

To calculate the new pressure of the helium, we use the formula below.

Formula:

Where:

Make P' the subject of the equation

From the question,

Given:

Substitute these values into equation 2

Hence, The new pressure of the helium gas is 40 atm.

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Answer:

c. rock formation

Explanation:

The Earth’s internal energy provides the means for the parts of the carbon cycle that involve plate tectonics, such as rock formation and subduction.

If the Earth did not have internal energy, the carbon cycle process which would not be possible is: C. rock formation.

Carbon cycle can be defined as the series of biogeochemical processes through which atoms of carbon or carbon compounds are interconverted and used within an environment, by transporting carbon from the atmosphere to the Earth and then back to the atmosphere.

Basically, the four (4) main processes associated with carbon cycle include the following:

Of all the aforementioned processes, only rock formation requires that the Earth has sufficient internal energy for the movement of materials around the core and the mantle, thereby, leading to gradual but significant changes within the Earth's crust.

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The reactants of cellular respiration are glucose and oxygen, or A. They react to form carbon dioxide, water, and energy as products.

No. Catalyst only reduce the activation energy, but don't change the energy released by the reaction.

A catalyst will alter the enthalpy of a reaction (the amount of heat that is released/absorbed) so it's not going to have the desired effect.

A catalyst is a substance that speeds up a chemical reaction, or lowers the temperature or pressure needed to start one, without itself being consumed during the reaction.

A catalyst increases the rate of a reaction, but does not get consumed in the reaction and does not alter the equilibrium constant.

In other words, a catalyst affects the kinetics of a reaction, but not the thermodynamics.

They work by increasing the rate of reaction through lowering the activation energy.

Hence, a catalyst will alter the enthalpy of a reaction (the amount of heat that is released/absorbed) so it's not going to have the desired effect.

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Answer:

a) 0.125 M.

b) 0.04888 M.

c) 0.2056 M.

d) 5.625 x 10⁻³ M.

Explanation:

(MV)before dilution = (MV)after dilution

(a) 1.00 L of a 0.250 M solution of Fe(NO₃)₃ is diluted to a final volume of 2.00 L.

∵ (MV)before dilution of Fe(NO₃)₃ = (MV)after dilution of Fe(NO₃)₃

M before dilution = 0.250 M, V before dilution = 1.00 L.

M after dilution = ??? M, V after dilution = 2.00 L.

∵ (MV)before dilution of Fe(NO₃)₃ = (MV)after dilution of Fe(NO₃)₃

∴ (0.250 M)(1.00 L) = (M after dilution of Fe(NO₃)₃)(2.00 L)

∴ M after dilution of Fe(NO₃)₃ = (0.250 M)(1.00 L)/(2.00 L) = 0.125 M.

(b) 0.5000 L of a 0.1222 M solution of C₃H₇OH is diluted to a final volume of 1.250 L.

∵ (MV)before dilution of C₃H₇OH = (MV)after dilution of C₃H₇OH

M before dilution = 0.1222 M, V before dilution = 0.500 L.

M after dilution = ??? M, V after dilution = 1.250 L.

∵ (MV)before dilution of C₃H₇OH = (MV)after dilution of C₃H₇OH

∴ (0.1222 M)(0.500 L) = (M after dilution of C₃H₇OH)(1.250 L)

∴ M after dilution of C₃H₇OH = (0.1222 M)(0.500 L)/(1.250 L) = 0.04888 M.

(c) 2.35 L of a 0.350 M solution of H₃PO₄ is diluted to a final volume of 4.00 L.

∵ (MV)before dilution of H₃PO₄ = (MV)after dilution of H₃PO₄

M before dilution = 0.350 M, V before dilution = 2.35 L.

M after dilution = ??? M, V after dilution = 4.00 L.

∵ (MV)before dilution of H₃PO₄ = (MV)after dilution of H₃PO₄

∴ (0.350 M)(2.35 L) = (M after dilution of H₃PO₄)(4.00 L)

∴ M after dilution of H₃PO₄ = (0.350 M)(2.35 L)/(4.00 L) = 0.2056 M.

(d) 22.50 mL of a 0.025 M solution of C₁₂H₂₂O₁₁ is diluted to 100.0 mL.

∵ (MV)before dilution of C₁₂H₂₂O₁₁ = (MV)after dilution of C₁₂H₂₂O₁₁

M before dilution = 0.025 M, V before dilution = 22.50 mL.

M after dilution = ??? M, V after dilution = 100.0 mL.

∵ (MV)before dilution of C₁₂H₂₂O₁₁ = (MV)after dilution of C₁₂H₂₂O₁₁

∴ (0.025 M)(22.50 mL) = (M after dilution of C₁₂H₂₂O₁₁)(100.0 mL)

∴ M after dilution of C₁₂H₂₂O₁₁ = (0.025 M)(22.50 mL)/(100.0 L) = 5.625 x 10⁻³ M.

The molarity of the diluted solutions can be calculated using the dilution equation: M1V1 = M2V2. For (a) the solution is 0.125 M, while for (b) it is 0.04888 M.

Calculating the molarity of the diluted solutions can be achieved by using the equation for dilution: M1V1 = M2V2, where M1 is the initial molarity, V1 is the initial volume, M2 is the final molarity, and V2 is the final volume. By substituting the given values into this equation, we can solve for the unknown molarity value.

(a) After diluting 1.00 L of a 0.250-M solution of Fe(NO3)3 to a final volume of 2.00 L, the final molarity (M2) would be (0.250 M * 1.00 L) / 2.00 L = 0.125 M.

(b) After diluting 0.5000 L of a 0.1222-M solution of C3H7OH to a final volume of 1.250 L, the final molarity (M2) would be (0.1222 M * 0.5000 L) / 1.250 L =  0.04888 M.

Acceptance of the answer should depend on the confidence that the answer is correct.

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If 1 dozen apples has a mass of 2.0 kg and 0.20 bushel is 1 dozen apples, how many bushels of apples are in 1.0 kg of apples?

0.1 bushels

There are 0.1 bushels in 1 kg of apple.

A dozen is a set of 12 things. A dozen of apples mean 12 piece of apples , a dozen of people mean 12 people.

It is given that

a dozen apples has a mass of 2.0 kg

and 0.20 bushel is 1 dozen apples,

bushels of apples are in 1.0 Kg of apples = ?

If 2 kg apples mean 1 dozen = 12 apples

then 1 kg apples will mean 6 apples

1 dozen or 12 apples = 0.20 bushels

6 apples will be 0.20 /2 = 0.1 bushels

Therefore there are 0.1 bushels in 1 kg of apple.

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Answer:

[tex]-253.2 ^{\circ}C[/tex]

Explanation:

First of all, we need to convert the pressure of the gas from torr to Pa. We know that:

1 torr = 133.3 Pa

So, the pressure in Pascals is

[tex]p=(312 torr)(133.3 Pa/torr)=4.16\cdot 10^4 Pa[/tex]

Then we also have:

n = 0.133 number of moles of the gas

[tex]V=525 mL=0.525 L=5.25\cdot 10^{-4} m^3[/tex] volume of the gas

The ideal gas equation states that

[tex]pV=nRT[/tex]

where R is the gas constant and T the absolute temperature. Solving the equation for T, we find

[tex]T=\frac{pV}{nR}=\frac{(4.16\cdot 10^4 Pa)(5.25\cdot 10^{-4} m^3)}{(0.133 mol)(8.314 J/mol K)}=19.8 K[/tex]

In Celsius, it becomes

[tex]T=19.8 K-273=-253.2 ^{\circ}C[/tex]

2.54m/s. See the attached image for work. X represents the velocity of SF4.

To calculate the velocity of sulfur tetrafluoride under the same conditions as oxygen, we need to consider their molar masses and use the formula for calculating the velocities of gases.

In order to determine the velocity at which sulfur tetrafluoride would travel under the same conditions as oxygen, we need to consider their molar masses. The molar mass of sulfur tetrafluoride (SF4) is 108.07 g/mol, while the molar mass of oxygen (O₂) is 32.00 g/mol. Since the velocities of gases are inversely proportional to the square root of their molar masses, we can use the formula:

The velocity of sulfur tetrafluoride = Velocity of oxygen × √(molar mass of oxygen / molar mass of sulfur tetrafluoride)

Using the given velocity of oxygen as 29.0 m/s, we can substitute the molar masses and calculate the velocity of sulfur tetrafluoride.

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The answer is E. You must use the formula q=mCDeltaT to solve this equation. You must also use the formula that q(reaction)=q(solution) to solve this problem

Answer:

The specific heat capacity of the metal piece is [tex]0.571J/g^oC[/tex].

Explanation:

The heat given by the hot body(metal pace) is equal to the heat taken by the cold body(water).

[tex]q_1=-q_2[/tex]

[tex]m_1\times c_1\times (T_f-T_1)=-m_2\times c_2\times (T_f-T_2)[/tex]

where,

[tex]c_1[/tex] = specific heat of metal = ?

[tex]c_2[/tex] = specific heat of water = [tex]4.184 J/g^oC[/tex]

[tex]m_1[/tex] = mass of metal = 57.3 g

[tex]m_2[/tex] = mass of water = 155 g

[tex]T_f[/tex] = final temperature of water = [tex]24.72^oC[/tex]

[tex]T_1[/tex] = initial temperature of metal = [tex]88^oC[/tex]

[tex]T_2[/tex] = initial temperature of water = [tex]21.53^oC[/tex]

Now put all the given values in the above formula, we get

[tex]57.3g\times c_1\times (24.5-88.0)^oC=-155g\times 4.184J/g^oC\times (24.72-21.53)^oC[/tex]

[tex]c_1=0.571 J/g^oC[/tex]

The specific heat capacity of the metal piece is [tex]0.571J/g^oC[/tex].

Answer:

[CH₃OH] to decrease and [CO] to increase.

Explanation:

[CH₃OH] to decrease and [CO] to increase.

Answer:

3) NaCl.

Explanation:

∵ ΔTf = iKf.m

where, i is the van 't Hoff factor.

Kf is the molal depression freezing constant.

m is the molality of the solute.

The van 't Hoff factor is the ratio between the actual concentration of particles produced when the substance is dissolved and the concentration of a substance as calculated from its mass.

So, for sugar: i = 1.

∴ ΔTf for sugar = iKf.m = (1)(Kf)(2.0 m) = 2 Kf.

For NaCl, it is electrolyte compound which dissociates to Na⁺ and Cl⁻.

So, i for NaCl = 2.

∴ ΔTf for NaCl = iKf.m = (2)(Kf)(1.0 m) = 2 Kf.

So, the right choice is: 3) NaCl.

Answer:

Explanation:

The number of protons in the nucleus of the atom is equal to the atomic number (Z). The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus.

the big number describes the number ratio in a chemical equation

so for example,

2H2 + O2 --> 2H2O means

2 moles of hydrogen reacts with one mole of oxygen to form 2 moles of water

and as you know, the small (subscript) number determines the number of atoms of that element in one molecule of a compound

so I believe that drawing a normal lewis structure ( O=O ) should be correct

Explanation:

For what I understand in the question, the "big number" is called a stoichiometric coefficient and represents the ammount of molecules of the substance that follows it ( in this case O2) involved in a reaction.

In this case there is no reaction but it asks you for the lewis structure of two molecules of oxygen (O2).

The lewis structure of oxygen is: O=O

Two molecules of it can bond by london forces or dative unions forming what is known as a dimer (two molecules of the same substance bonded).

A is correct (1 h should be written as 1 s)

I just took this exam. :)

Answer:

Your correct answer is A. 1 h should be written as 1 s.

Explanation:

Answer:

Explanation:

1) Osmotic pressure is a colligative property, which means that it depends on the number of particles of solute present in the solvent.

2) The mathematical expression that relates osmotic pressure with the concentration of solute is:

Where:

3) Here:

4) Calculate M

             = 0.605 atm / (1 × 0.08206 L atm mol⁻¹ K⁻¹ × 298.15 K) =

             = 0.0247 atm (three significant figures)

5) Calculate number of moles, from molarity definition:

            ⇒ n = M × V (in liters) = 0.0247 M × 0.250 liter =

                    = 0.00618 moles

6) Calculate molar mass:

                             = 2.35 g / 0.00618 moles

                             = 380 g/mol ← answer

The molar mass of the given organic compound based on the given osmotic pressure and solution composition is calculated to be 379 g/mol.

The question asks for the molar mass of an organic compound that was dissolved in water to create a dilute aqueous solution. The resulting osmotic pressure of 0.605 atm at 25°C will be used to calculate the molar mass.

Firstly, the osmotic pressure formula is II = MRT, where M is the molarity, R is the ideal gas constant (0.08206 L atm/mol K) and T is the temperature in Kelvin (25°C = 298.15 K). Thus, you can solve it like this: 0.605 atm = M * 0.08206 L atm/mol K×298.15K, from which we get the Molarity as 0.0248 mol/L.

Secondly, molar mass is calculated by dividing the mass of the solute by the number of moles. If we had 0.250 L of solution with a molarity of 0.0248 mol/L, the total amount of moles in the solution would be (0.250 L) * (0.0248 mol/L) = 0.0062 mol. Now, if these 0.0062 mol were acquired from 2.35 g of the organic compound, the molar mass would be (2.35 g) / (0.0062 mol) = 379 g/mol.

In conclusion, the molar mass of your organic compound is 379 g/mol based on the information provided in the question.

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Answer:

B. ethylamine.

Explanation:

So, the compound is ethylamine.

Answer:

When an acid and strong reacts with each other the formation of salt occurs, and this reaction is named as neutralization reaction. The pH of salt depends upon the nature of acid and bases reacting in the reaction. When a week acid and a strong base reacts with each other, the base dominates the nature of salt because base involved is strong. The pH of the salt will be greater than 7.

the number and kind of each atom on the reactants side must be equal to number and kind of each atom on products side.

Final answer:

In a chemical reaction, the number and type of atoms remain constant from reactants to products, following the law of conservation of matter. Chemical equations are balanced by adjusting the molecular coefficients to ensure this atomic consistency. Conservation of mass is also observed, with mass being equivalent in the reactants and products.

Explanation:

In accordance with the law of conservation of matter, the number and kind of atoms must remain constant throughout a chemical reaction. This means the number of each type of atom in the reactants is equal to the number of each type of atom in the products.

To ensure this is the case, chemists balance chemical equations by adjusting coefficients in front of the chemical formulas, which represent the amount (in moles) of substances involved in the reaction. Balancing an equation may require a methodical back-and-forth process until the same numbers of atoms for each element are present on both sides of the equation.

Furthermore, while the number of atoms is conserved during the reaction, the number of molecules may change because molecules can break apart, and atoms rearrange to form different molecules. The mass of the reactants and products is also conserved, exemplified by Avogadro's number relating atoms to moles, and moles to molar mass. This conservation of mass is a fundamental concept in chemical reactions.

Ag atoms are oxidized to form Ag+ ions

Silver tarnishes when it is oxidized to form Ag+ ions. The process involves the loss of electrons. Silver ions can be reduced back to silver atoms in certain chemical reactions by the use of reducing agents like iron (II) ions or zinc, but not during the tarnishing process which is an oxidation process.

When silver tarnishes, the silver atoms (Ag) are indeed oxidized to form Ag+ ions. This is a chemical reaction where silver loses electrons and hence, is oxidized. This process is represented in the reaction depicted: Ag+ (aq) + e¯ → Ag(s). However, it should be noted that in an oxidation reaction, while one species (here - silver) is oxidized, another species must be reduced concurrently. In the context of your question, Ag atoms are not reduced back to Ag+ ions, as that would counteract the oxidation process.

In cases where silver is recovered from solutions, such as a cyanide solution, reducing agents such as iron (II) ions or zinc might be added, leading to a reaction: 2[Ag(CN)₂](aq) + Zn(s) → 2Ag(s) + [Zn(CN)4] ²¯ (aq). This is a chemical reduction as silver ions are reduced back to silver atoms.

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Answer: the percent composition of carbon in heptane is 83.9%

Explanation:

1) Atomic masses of the atoms:

2) Molar mass of heptane:

3) Mass of carbon in one mole of heptane:

3) Percent composition of carbon:

           = (84.07 g/ 100.2 g) × 100 = 83.9% ← answer

Answer:

C) reduced

Explanation:

NAD+ becomes reduced when it gains a hydrogen atom, transforming into NADH, which plays a significant role in cellular energy metabolism.

When a molecule of NAD+ (nicotinamide adenine dinucleotide) gains a hydrogen atom, the molecule becomes reduced. This process of gaining an electron (or hydrogen atom) is known as reduction in metabolism. Essentially, NAD+ serves as an important electron carrier within cells and as it accepts electrons, it becomes reduced to its alternate form called NADH. It's important to note that oxidation and reduction reactions often go hand in hand in biological systems, which is why they are typically referred to as redox reactions. In this context, NAD+ is reduced (gains an electron) to form NADH, which then plays a crucial role in energy metabolism within the cell.

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The liquid mantle flowing through the cracks in Earth's crust during volcanic eruptions.

Final answer:

The formation of Earth's crust is most likely due to the D. liquid mantle flowing through cracks during volcanic eruptions, as at divergent boundaries, molten material from the mantle rises and cools to form new crust.

Explanation:

The processes that help in the constant formation of Earth's crust are primarily associated with tectonic activities and the movement of magma. According to the options provided, the liquid mantle flowing through the cracks in Earth's crust during volcanic eruptions (D) is the most likely process responsible for the formation of new crust. This is because at divergent boundaries, such as the Mid-Ocean Ridge, molten material from the mantle rises through the gaps created by tectonic plates moving apart.

As the molten material cools, it solidifies and forms new crust. Convection currents in the mantle (B) are thought to drive the movement of tectonic plates, contributing to processes such as sea floor spreading and the creation of new crust along the Mid-Ocean Ridge. Additionally, subduction zones where oceanic crust collides with continental crust (B) can lead to volcanic activity and the formation of new crust.

False. carbon-carbon bonds that share 2 pairs of electrons are double bonds. An unsaturated hydrocarbon isnt necessary to only have double bonds. they can also have single bonds or triple bonds.

Answer: The given statement is false.

Explanation:

An unsaturated hydrocarbon is a chain of carbon and hydrogen atoms in which adjacent carbon atoms are attached together through double or triple bond.

Since it is known that carbon atom forms covalent compounds so, an unsaturated hydrocarbon not only contains double or triple bonds it also has single bonds in between.

Thus, we can conclude that the statement all of the covalent carbon-carbon bonds in unsaturated hydrocarbons share 2 pairs of electrons, is false.

Explanation:

Molarity is defined as the number of moles divided by volume in liter.

Mathematically,      Molarity = [tex]\frac{no. of moles}{volume in liter}[/tex]

But for two solutions or mixtures with equal number of moles the formula to calculate molarity will be as follows.

                      [tex]M_{1}V_{1}[/tex] = [tex]M_{2}V_{2}[/tex]

                      [tex]1.00 m \times 0.01 l[/tex] = [tex]M_{2} \times 0.02 l[/tex]

                               [tex]M_{2}[/tex] = 0.5 m

Thus, we can conclude that the molarity of the NaOH is 0.5 m.

When NaOH is added to an acetate/acetic acid buffer system, the pH increases, the concentration of acetic acid decreases, and the concentration of acetate increases.

When a small volume of NaOH solution is added to an acetate/acetic acid buffer system, the following occur:

This is because when NaOH is added, it reacts with acetic acid to form sodium acetate and water. The increase in concentration of sodium acetate leads to an increase in the concentration of acetate ions, causing the pH to increase. At the same time, the reaction consumes acetic acid, resulting in a decrease in its concentration.

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Answer:

2.037.

Explanation:

∨ ∝ 1/√M.

Where, ∨ is the rate of diffusion.

M is the molar mass of the gas.

(∨)Ne/(∨)Kr = √(M of Kr/M of Ne) = √(83.8 / 20.2) = 2.037.

Answer:

0.2286 mol

Explanation:

Mass = 36.5g

Molar Mass = 159.7 g/mol

Number of moles = ?

The formular relating these parameters is given as;

Number of moles = Mass /  Molar mass

Number of moles = 36.5 / 159.7 = 0.2286 mol

The direction of a chemical reaction depends on the comparison between the reaction quotient and the equilibrium constant. If the reaction quotient is greater than the equilibrium constant, the reaction goes in the reverse direction, and vice versa. This can be determined using concentrations (Qc, Kc) or partial pressures (Qp, Kp).

In the context of chemistry, a reaction's direction can indeed be predicted by comparing the reaction quotient (Qc) with the equilibrium constant (Kc). If Qc > Kc, the reaction will tend to move in the reverse direction to reach equilibrium, as it indicates that there are too many products and not enough reactants. Conversely, if Qc < Kc, the reaction will proceed in the forward direction, as it means that there are too many reactants and not enough products. Similarly, partial pressures can be used using the reaction quotient (Qp) and equilibrium constant (Kp). These concepts are central in the study of chemical equilibria, and understanding them will help comprehend how concentrations and pressures influence the direction of reactions.

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Equilibrium constants for gas-phase reactions can be expressed in terms of partial pressures. The relationship between partial pressures (Kp) and molar concentrations (Kc) can be derived from the ideal gas equation.

In chemistry, for gas-phase solutions, the equilibrium constant can be expressed either in terms of molar concentrations (Kc) or partial pressures (Kp) of the reactants and products. These two equilibrium constants are interrelated and can be derived using the ideal gas equation: PV = nRT where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is temperature.

The equilibrium constant Kp for a reaction involving gases is defined in terms of the partial pressures of the gases. For example, consider the reaction:

[tex]C_2H_6(g)[/tex]⇌ [tex]C_2H_4(g) + H_2(g)[/tex]

The equilibrium constant expression based on partial pressures would be:

[tex]Kp = (PC_2H_4)(PH_2) / PC_2H_6[/tex]

The reaction quotient (Qc or Qp) is calculated using initial or current pressures and can predict the direction of the reaction:

Using partial pressures allows for a precise understanding of how the system behaves under different conditions, including changes in initial amounts of reactants/products, temperature, and volume.