why does it take more energy to evaporate water than to melt ice?

To determine which statement is true, we need to use Equation 5, which gives us the standard cell potential for a galvanic cell. The equation is: E° cell = E° cathode - E° anode

where E° cathode is the standard reduction potential of the cathode and E° anode is the standard reduction potential of the anode.

We also need to use the Standard Reduction Potentials table, which lists the reduction potentials for various half-reactions.

a. Copper is the anode and lead is the cathode:

The half-reaction for copper is Cu2+(aq) + 2e- → Cu(s) with a standard reduction potential of +0.34 V, and the half-reaction for lead is Pb2+(aq) + 2e- → Pb(s) with a standard reduction potential of -0.13 V. Plugging these values into Equation 5, we get:

E° cell = (+0.34 V) - (-0.13 V) = +0.47 V

Since the E° cell value is positive, this statement is true.

b. Zinc is the cathode and lead is the anode:

The half-reaction for zinc is Zn2+(aq) + 2e- → Zn(s) with a standard reduction potential of -0.76 V. Plugging this value and the standard reduction potential for lead into Equation 5, we get:

E° cell = (-0.13 V) - (-0.76 V) = +0.63 V

Since the E° cell value is positive, this statement is also true.

c. Aluminum is the cathode and zinc is the anode:

The half-reaction for aluminum is Al3+(aq) + 3e- → Al(s) with a standard reduction potential of -1.66 V. Plugging this value and the standard reduction potential for zinc into Equation 5, we get:

E° cell = (-0.76 V) - (-1.66 V) = +0.90 V

Since the E° cell value is positive, this statement is also true.

d. Zinc is the cathode and copper is the anode:

The half-reaction for copper is Cu2+(aq) + 2e- → Cu(s) with a standard reduction potential of +0.34 V. Plugging this value and the standard reduction potential for zinc into Equation 5, we get:

E° cell = (+0.34 V) - (-0.76 V) = +1.10 V

Since the E° cell value is positive, this statement is also true.

e. Aluminum is the cathode and lead is the anode:

The half-reaction for aluminum is Al3+(aq) + 3e- → Al(s) with a standard reduction potential of -1.66 V, and the half-reaction for lead is Pb2+(aq) + 2e- → Pb(s) with a standard reduction potential of -0.13 V. Plugging these values into Equation 5, we get:

E° cell = (-0.13 V) - (-1.66 V) = +1.53 V

Since the E° cell value is positive, this statement is also true.

f. Copper is the anode and aluminum is the cathode:

The half-reaction for copper is Cu2+(aq) + 2e- → Cu(s) with a standard reduction potential of +0.34 V, and the half-reaction for aluminum is Al3+(aq) + 3e- → Al(s) with a standard reduction potential of -1.66 V. Plugging these values into Equation

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*sorry I can't give a full explanation.*

g = 9.8 m/s²

w = m*g

Weight of cat: 55 N = m*9.8

m = 5.61 kg

Weight of dog: 110 N = m*9.8

m = 11.22 kg

There is gravitational potential energy (GPE) acting on the cat since it's at the very top.

GPE of cat = m*g*h = 5.61*9.8*2 = 109.96 J

GPE of dog = m*g*h = 11.22*9.8*0 = 0 J (it's 0 m height because it's on the floor instead of in the tree)

But, if the dog was also 2 m up in the tree, its GPE would be 219.91 J.

As you can see, it's GRAVITATIONAL potential energy is bigger than the cat because it weighs more. Generally, if you were just trying to find the force which is w = m*g (since weight is a force), you would see that the bigger the mass, the bigger the force, and gravity stays the same.

Hope this helped

Answer:

B. 33.5 cm

Explanation:

Add all numbers, and divide by the number of addends.

Add 30.5, 32.1, 40.6, 30.5,and 33.8, and you get 167.5

Divide that by 5, and you get 33.5

~theLocoCoco

AnsweScientists use creativity to determine which smaller questions are likely to yield results, imagine possible answers to their questions, and devise ways to test those answers.

Since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. So as the mass of either object increases, the force of gravitational attraction between them also increases.

The strength of the gravitational force between two objects depends on two factors, mass and distance. the force of gravity the masses exert on each other. If one of the masses is doubled, the force of gravity between the objects is doubled. increases, the force of gravity decreases.

A person can weigh differently at various place on Earth because of the fluctuations in Earth's gravity, according to a new high-resolution map. Gravity is often assumed to be the same everywhere on Earth, but it varies because the planet is not perfectly spherical or uniformly dense.

Newton's law of gravitation, statement that any particle of matter in the universe attracts any other with a force varying directly as the product of the masses and inversely as the square of the distance between them.

An objects mass is determined by the number of unit masses that make it up. Its weight is determined by the degree to which gravitational force acts on it. On Earth an object whose mass is 100 grams is pulled towards the center of the planet with a force of 1 Newton.

Since gravitational force is inversely proportional to the square of the separation distance between the two interacting objects, more separation distance will result in weaker gravitational forces. So as two objects are separated from each other, the force of gravitational attraction between them also decreases.r:

Explanation:

10.0 tonnes of TiO₂ can be produced at most from 19.0 tonnes of the mineral ilmenite, FeTiO₃. The first option is correct.

Utilizing the "mole concept," we may determine the mass of chemical substances according to the situation. A mole is a precise unit of measurement for the number of atoms or molecules in a large sample of the substance. It is the amount of a substance that includes precisely the Avogadro number of the substance's "elementary entities". It is practical to express the quantity of a substance using the mole concept.

For the given situation, first, write the complete equation,

\(\mathrm{FeTiO_3\longrightarrow FeO+TiO_2}\)

Then, the mole concept is introduced as,

\(\begin{aligned}\mathrm{\frac{mole\;of\;TiO_2}{mole\;of\;FeTiO_3}}&=\frac{1}{1}\\\mathrm{mole\;of\;TiO_2}&=\mathrm{mole\;of\;FeTiO_3}\\\mathrm{\frac{m_{TiO_2}}{79.9}}&=\frac{19.0}{151.7}\\\mathrm{m_{TiO_2}}&=\frac{79.9\times19.0}{151.7}\\&=\mathrm{10.00\;tonnes}\end{aligned}\)

The required answer is 10.0 tonnes.

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No, it does not pass the "fat pencil" test. Therefore, a normal distribution is not a reasonable model. Option B is the correct answer.

The "fat pencil" test is a quick visual check to determine if a dataset can be reasonably approximated by a normal distribution. In this case, the pH readings of wastewater show a significant deviation from a normal distribution. The presence of several low pH values (1.0) and a few high pH values (10.0, 10.5, 11.4) indicate a non-normal distribution with skewness and potential outliers. Therefore, it is not reasonable to model these data using a normal distribution.

Option B is the correct answer.

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Answer:

Decomposition

Explanation:

Magnesite = Magnesium Oxide + Carbon Dioxide

The elements are categorized based on similar attributes so that it could be easier to collectively study the properties of the elements.

The periodic table is arrangement of the elements based on the atomic number of the elements. This implies that the elements are arranged in the order of increasing atomic numbers of the elements. The atomic numbers of the elements therefore tend to increase from left to right. This is how the Mendeleev table of elements was arranged.

Now, let us know that the periodic table is arranged in groups and periods. The elements in the same group have similar chemical properties while the elements in the same period only have the same number of shells or the same highest energy level.

Having said this, the elements are categorized based on similar attributes so that it could be easier to collectively study the properties of the elements.

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Answer:

0.0899 moles of oxygen (O2).

Explanation:

What is given?

Mass of sodium oxide (Na2O) = 11.15 g.

Molar mass of Na2O = 62 g/mol.

Step-by-step solution:

First, let's state the balanced chemical equation:

Let's calculate the moles of Na2O that are in 11.15 g of Na2O, using its molar mass:

Now that we have the moles of Na2O, let's do the stoichiometry: you can see in the chemical equation that 1 mol of oxygen (O2) reacted produces 2 moles of Na2O, so by doing a rule of three based on this data, the calculation will look like this:

The answer is that we need 0.0899 moles of oxygen (O2) to produce 11.15 g of sodium oxide.

Answer:

5.23 moles

Explanation:

How many moles of iron are present in 3.15 × 10^24 atoms of iron?

1 mole has 6.02 X 10^23 particles

so

3.15X10^ 24 atoms =( 3.15 X 10^24)/(6.02 X 10^23) =(3.15/6.02 )X 10 =

5.23 moles

7.8×10⁻² moles of water were in the sample of the salt

m(NiCl₂·6H₂O) = 3.5 g; mass of a hydrous salt

m(NiCl₂) = 2.1 g; mass of an anhydrous salt

m(H₂O) = m(NiCl₂·6H₂O) - m(NiCl₂)

m(H₂O) = 3.5 g - 2.1 g

m(H₂O) = 1.4 g; mass of water

M(H₂O) = 18 g/mol; the molar mass of water

n(H₂O) = m(H₂O) ÷ M(H₂O)

n(H₂O) = 1.4 g ÷ 18 g/mol

n(H₂O) = 0.078 mol; amount of water in the sample

The mole is an SI unit which measures the number of particles in substance. One mole is equal to 6.022·10²³ atoms.

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Refer to the above for the answer.

Answer:

Sorry I don't know.

Explanation:

I'm only in 8th grade, or I would help.

Answer:

5 moles of Fe(II) are required to react completely with the 5 moles of Sulphur

Explanation:

The balanced equation in this question is

Iron + Sulfur = Iron(II) Sulfide

Fe (II) + S --> Fe(II)S

Thus one mole of sulfur reacts with one mole of Fe(II)

Hence, 5 moles of Fe(II) are required to react completely with the 5 moles of Sulphur

Avogadro's Number and the Mole. The mole is represented by Avogadro's number, which is 6.022×1023 atoms or molecules per mol.

Answer:

Electrical energy is the product of power multiplied by the length of time it was consumed. So if we know how much power, in Watts is being consumed and the time, in seconds for which it is used, we can find the total energy used in watt-seconds. In other words, Energy = power x time and Power = voltage x current.

The amount of current the electric motor having a power of 240 W Will draw from the 24 V supply is 10 A

This is defined as the rate in which energy is consumed. Electrical power is expressed mathematically as:

Power (P) = voltage (V) × current (I)

P = IV

From the question given above, the following data were obtained:

Voltage (V) = 24 V

Power (P) = 240 W

Current (I) = ?

P = IV

240 = I × 24

Divide both sides by 24

I = 240 / 24

I = 10 A

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Answer:

To communicate with each other

Explanation:

Cows use sound (mooing) to communicate with each other and their environment. Cows are herd animals and have complex social structures. Mooing is one way that they interact and how they express their emotions

10 H⁺ + NO₃⁻ + 8 e⁻ → NH₄⁺ + 3 H₂O + 8 e⁻
This is the balanced redox reaction.

To balance the given reaction, we need to identify the half-reactions for oxidation and reduction. The reaction is:

10 H⁺ + NO₃⁻ → NH₄⁺ + 3 H₂O

The half-reactions are as follows:

Oxidation: 10 H⁺ + 8 e⁻ → 5 H₂ (Balancing hydrogen and electrons)
Reduction: NO₃⁻ + 10 H⁺ + 8 e⁻ → NH₄⁺ + 3 H₂O (Balancing nitrogen, oxygen, hydrogen, and electrons)

Adding the half-reactions together, we get the balanced redox reaction:

10 H⁺ + NO₃⁻ + 8 e⁻ → NH₄⁺ + 3 H₂O + 8 e⁻

The balanced redox reaction contains the correct number of electrons on the correct side.

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No, pure liquid water cannot exist at 110°C. Phases are dependent on both temperature and pressure. More specifically, water boils at 100°C at a pressure of 1 atm. If the pressure was lower, the temperature needed to boil water would be higher.

Pure water has a boiling point of 100°C at atmospheric pressure. However, the phases of water depends on the temperature and pressure of the water sample.

At lower pressure, water boils at a higher temperature while at a higher pressure, water boils at lower temperature.

Summarily, Pure water can not exist as a liquid at 110°C, it must have been converted into vapour. Unless the water is impure.

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The enthalpy of solution per mole NaOH (s) is 0.075 J.

Enthalpy, belonging to a thermodynamic gadget, is the sum of the machine's inner strength and the made of its stress and volume. it's far a state function used in many measurements in chemical, organic, and bodily systems at a steady pressure, which is without problems furnished by way of the massive ambient environment.

Calculation:-

H = mΔHf

ΔHf = H/m

       = 3.90/52

      = 0.075

Enthalpy is the quantity of inner electricity contained in a compound while entropy is the amount of intrinsic disorder inside the compound. Enthalpy is zero for elemental compounds consisting of hydrogen gas and oxygen gas; consequently, enthalpy is nonzero for water (no matter segment.

In thermochemistry, the enthalpy of solution is the enthalpy exchange related to the dissolution of a substance in a solvent at regular strain resulting in limitless dilution. The enthalpy of the answer is most usually expressed in kJ/mol at a steady temperature.

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The new volume of the gas wii be 4.7 liters.

The correct answer is a) Henry's Law. This law states that the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas in the overlying space.

This means that as the partial pressure of the gas increases, more gas molecules will dissolve in the liquid. Henry's Law is important in many areas of science, including chemistry, environmental science, and biology.

For example, it is used to understand the behavior of gases in the atmosphere and their impact on climate change, as well as the ability of aquatic organisms to obtain oxygen from water.

Henry's Law can also be applied to industrial processes such as gas purification and carbonation of beverages.

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The volume of 8.8g of carbon dioxide at STP is 4.38 L.

1 mole of any gas will take up 22.4 L of space at standard temperature and pressure (STP). A balanced chemical equation and the Ideal Gas Law can be used to determine the amount or mass of gas consumed or created in a chemical process.

n = m/M

where m is the molar mass of carbon dioxide and M is its mass in terms of molecules.

Considering that the molar mass of carbon dioxide is 44.01 g/mol:

n = 8.8 g / 44.01 g/mol

n = 0.1998 mol

Next, we can plug in the values of n, R, P, and T into the ideal gas law and solve for V:

V = (nRT)/P

V = (0.1998 mol x 0.0821 L·atm/(mol·K) x 273.15 K) / 1 atm

V = 4.38 L

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Answer:

Size!

Explanation:

As Sea Levels increase, more of the land mass would be covered up by water. Due to this, it seems like the continents are much more smaller than they really are.

(Apologize if its wrong, it should make sense!)

Answer:

Four main processes erode the destructive waves; hydraulic action, compression, abrasion and attrition. Hydraulic Action is the sheer force of water crashing off the coastline causing the material to dislodge and be carried away by the sea.

Answer:

a

Explanation:

Answer:

Atomic theory is. A

Explanation:

Subject to change if new information is discovered. B. A solution to the problem of differing isotopes. C. Unchanged able D. A descriptive table that lists all of the element

I hope this answered your question.

In Chemistry, we always have to balance the equations, in many topics within the subject of Chemistry, it is required to do that, this is because we have to account for every atom in the reaction, on both sides, reactant and product, the same number of atoms that are on the reactants side must be on the products side. Therefore, the best answer for this question will be letter D

Answer:

C

Explanation:

view the Attached photo i added to see how i got that answer

When a molecule lacks polar bonds, there is no permanent charge difference between parts of the molecule, and the molecule is nonpolar.

Because the electron charge on both atoms is identical, the Cl2 molecule has no polar bonds. As a result, it is a nonpolar molecule. Hydrocarbons are nonpolar molecular substances because none of the bonds in hydrocarbon molecules, such as hexane, C6H14, are significantly polar.

The molecule is nonpolar if the arrangement is symmetrical and the arrows are of equal length. The molecule is polar if the arrows are of different lengths and do not balance each other. The molecule is polar if the arrangement is asymmetrical.

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Answer:

S=O

Explanation:

The bond energies of the given compounds are:

O-O bond energy = 142 kJ/mol

O=O bond energy = 495 kJ/mol

O-F bond energy = 190 kJ/mol

S=O bond energy = 523 kJ/mol

Therefore, the S=O bond has the highest bond energy at 523 kJ/mol.