In which of the following sets do all species have the same number of protons?
(A) Br-, Kr, Sr2+
B) Mg2+, Sr2+, Ba2+
C, N3-, 02-
0, 02-, 02+
D

The standard cell potential is found as +1.95 V and is a  spontaneous  reaction.

The standard cell potential (E°cell) of an electrochemical cell is given by the difference between the standard reduction potentials of the two half-cells involved.

E°cell = E°reduction (cathode) - E°reduction (anode)

The half-reactions given are:

Pb4+ + 2e− → Pb2+ (reduction)

Co3+ + e− → Co2+ (reduction)

The standard reduction potentials for these half-reactions are:

E°reduction(Pb4+/Pb2+) = -0.13 V

E°reduction(Co3+/Co2+) = +1.82 V

We then calculate as:

E°cell = E°reduction (Co3+/Co2+) - E°reduction (Pb4+/Pb2+)

E°cell = (+1.82 V) - (-0.13 V)

E°cell = +1.95 V

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Answer:

so so

Explanation:

this your question?? <_>

Answer:

1) As you move down a group, first ionization energy decreases. WHY? Electrons are further from the nucleus and thus easier to remove the outermost one. 2) As you move across a period, first ionization energy increases.

so i think it is b

Explanation:

Tectonic plates are huge pieces of EARTH'S LITHOSPHERE that slowly move on the ASTHENOSPHERE.

A tectonic plate is a large, rigid slab of solid rock that makes up the Earth's outermost layer, known as the lithosphere. The lithosphere is broken up into a series of tectonic plates that are in constant motion, driven by the flow of the Earth's mantle beneath them. There are several major tectonic plates, including the North American, South American, African, Eurasian, Australian, Pacific, and Antarctic plates, as well as several smaller plates. The movement of tectonic plates is responsible for a variety of geological phenomena, such as earthquakes, volcanic eruptions, mountain building, and the formation of oceanic trenches and ridges. The theory of plate tectonics provides the framework for understanding the dynamics of the Earth's crust and how it has evolved over time.

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Answer:

Answer is letter B

Explanation:

The first one is wrong because acids release H+, not bases.

The third one is wrong because the pH is exactly 7, not greater.

The last one is wrong because it is vague and does not fit a neutralization reaction.

The enthalpy change, ΔH, of the reaction is  -103 kJ/mol.

The enthalpy change, ΔH, of the reaction is obtained from the bond enthalpies and the equation of the reaction.

Equation of the reaction:  H−H (g) +  Br−Br(g) → 2 H−Br(g)

To estimate ΔH for the reaction is calculated from the formula below:

ΔH = Σ (bonds broken) - Σ (bonds formed)

ΔH = (1 × 436 kJ/mol) + (1 × 193 kJ/mol) - (2 × 366 kJ/mol)

ΔH = 436 kJ/mol + 193 kJ/mol - 732 kJ/mol

ΔH = -103 kJ/mol

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Answer : i think the answer is A

Explaination : its not D , C i feel like it would be bigger so there would be more transpiration an B less would not have bigger so i hope this helps have a good day ☆

Answer:

c maybe if right plz mark brainliest

Explanation:

Answer:

14

Explanation:

it 14 there are 14 neutrons

Answer:

The molecules in the liquid are moving past one another. The hydrogen end of one water molecule is attracted to the oxygen end of another but only for a short time because they are moving. The molecules in ice are further apart than in liquid water. The molecules in ice are in fixed positions but still vibrate.

Explanation:

-google

Answer:

Explanation:

As the earth revolves around the sun, and the moon revolves around the earth, the intensity of sunlight hitting the moon changes over time. This explains why we get the phases of the moon. The answer as to why, is because the moon was moving towards a state of being a "full moon."

The percent by mass of the lithium in the compound is 18.78%. Option C

We know that the percentage has to do with the amount of the element that can be found in the compound. We can be able to obtain this when we  find the molar mass of the compound and then obtain the mass of the element in the compound.

Hence;

Molar mass of the compound = [2(7) + 12 + 3(16)]

= 14 + 12 + 48

= 74 g/mol

The we have the mass of the lithium in the compound as 14

Thus we then have;

Percent of lithium = 14/74 * 100/1

= 18.78%

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Hey there!

Mercury (II) chloride has a molar mass of 271.52 g/mol.

So, one mole of mercury (II) chloride has a mass of 271.52 g/mol.

We have 60.5g of mercury (II) chloride.

60.5g ÷ 271.52g/mol = 0.223 mol

There are 0.223 moles in 60.5g of mercury (II) chloride.

Hope this helps!

Answer:

Mercury (II) chloride has a molar mass of 271.52 g/mol.

So, one mole of mercury (II) chloride has a mass of 271.52 g/mol.

We have 60.5g of mercury (II) chloride.

60.5g ÷ 271.52g/mol = 0.223 mol

There are 0.223 moles in 60.5g of mercury (II) chloride.

Hope this helps!

Answer the question NOW Mistystar4881

I hope this was helpful HATERZ like some name above me lol JK about LOL. LOL

Note that the above prompt on Ecology draws it's analysis form a well known story which have been told visually called "The Lion King".

The answers are:

1) Biotic Factors, simply put are living things

2 examples of things from Lion King Introduction are:

3) Abiotic factors are Non -living things.

4) Examples from the introduction are:

5) the symbiotic relationship is called: commensalism.

Long-term biological interactions known as commensalism occur when individuals of one species benefit while those of the other species suffer neither advantages nor harm.

Ecology which is the study of the environment, allows  a person  to comprehend how different types of creatures coexist in various kinds of physical settings.

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Full Question:

Although part of your question is missing, you might be referring to this full question:

1) What is Biotic Factors

2) List three biotic factors from the Lion King introduction

3) What is Abiotic factors?

4) List three Abiotic factors from the Lion King introduction

5) The bird riding on the tusks of the elephant feed on insects the elephant stirs up. What kind of symbiotic relationship exists between the two?

Diffusion and convection are two distinct processes that play a role in the dispersal of air pollution, but they differ in how they transport pollutants and their impact on dispersion.

Diffusion refers to the spontaneous movement of particles from an area of higher concentration to an area of lower concentration. It occurs due to random thermal motion of molecules. In the context of air pollution, diffusion allows pollutants to spread out gradually, dispersing them in various directions. However, diffusion alone is a relatively slow process, particularly for large-scale dispersion, and it may not be effective in rapidly distributing pollutants over long distances.

Convection, on the other hand, involves the transfer of heat energy through the movement of a fluid, such as air or water. In the atmosphere, convection occurs as warm air rises, creating upward currents and transporting pollutants vertically. As the air rises, it carries pollutants to higher altitudes, which can lead to their dispersion over larger areas. Convection is a more efficient process for the vertical transport and dispersion of pollutants compared to diffusion.

The impact of diffusion and convection on the dispersal of air pollution can vary. Diffusion primarily affects local dispersion, allowing pollutants to spread out in the immediate vicinity of emission sources. It is more significant in areas with minimal air movement. Convection, on the other hand, can facilitate the long-range transport of pollutants, particularly when large-scale weather systems are involved. Convection can carry pollutants over greater distances and contribute to regional or even global dispersion, depending on weather patterns.

In summary, diffusion and convection are both involved in the dispersal of air pollution, but they differ in the mechanisms of transport and the scale of dispersion. Diffusion leads to gradual spreading of pollutants locally, while convection enables vertical transport and dispersion over larger areas, including long-range transport depending on weather conditions. Understanding the interplay between these processes is crucial for assessing the extent and impact of air pollution.

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B: It has fewer than 10 total watersheds best describes

A watershed is the area of land where all of the water that falls in it and drains off of it goes to a common outlet. All the land drains water into rivers that drain into the Chesapeake Bay, where it enters the Atlantic Ocean.

The area that drains into a single river is the watershed for that river.

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H2 cannot be the chemical symbol for an element.

Chemical elements, functional groups, and compounds are all denoted by chemical symbols, which are shorthand abbreviations. Chemical elements are typically represented by one or two letters from the Latin alphabet, with the first letter capitalized.

Dihydrogen is referred to as H2. It is a gas molecule, an elemental molecule, and an elemental hydrogen. Dihydrogen is not a name for an element in the periodic table.

Two hydrogen atoms are linked by a single bond to form the elemental molecule known as dihydrogen. It serves as a fuel, an electron donor, an antioxidant, a human metabolite, and a component of the food packaging gas. It is a gas molecule, an elemental molecule, and an elemental hydrogen.

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Answer:

pasture/range

Explanation:

this is because more than 1/3 of the country's land is being used for this mean alone.

Answer: Forest

Explanation: The largest percentage of land use in the United States is for forests.

Answer:

We can use the information given in the problem to calculate the RAM (relative atomic mass) of X and the minimum volume of hydrogen used in the reaction.

First, we need to calculate the mass of oxygen in the oxide XO:

mass of oxygen = mass of oxide - mass of metal

mass of oxygen = 4.5 g - 3.6 g

mass of oxygen = 0.9 g

Next, we can use the mass of oxygen to calculate the number of moles of oxygen:

moles of oxygen = mass of oxygen / molar mass of oxygen

moles of oxygen = 0.9 g / 16.00 g/mol

moles of oxygen = 0.05625 mol

Since the oxide XO is formed by the combination of X and oxygen, we can assume that the mass of X in the oxide is equal to the mass of the oxide minus the mass of oxygen:

mass of X = mass of oxide - mass of oxygen

mass of X = 4.5 g - 0.9 g

mass of X = 3.6 g

We can use the mass of X and the number of moles of oxygen to calculate the number of moles of X:

moles of X = mass of X / atomic mass of X

moles of X = 3.6 g / atomic mass of X

Combining this with the stoichiometry of the reaction, which tells us that 1 mole of XO reacts with 1 mole of H2 to produce 1 mole of X and 1 mole of H2O, we can write:

moles of H2 = moles of X / 1 = (3.6 g / atomic mass of X) / 1

To determine the minimum volume of hydrogen at STP (Standard Temperature and Pressure), we can use the ideal gas law:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the universal gas constant, and T is the temperature. At STP, the pressure and temperature are 1 atm and 273 K, respectively, and the universal gas constant is 0.08206 L atm/(mol K).

Substituting the given values and solving for V, we get:

V = nRT/P = [(3.6 g / atomic mass of X) / 1] * (0.08206 L atm/(mol K)) * 273 K / 1 atm

Simplifying and solving for the atomic mass of X, we get:

atomic mass of X = (3.6 g / V) * (1 mol/2 mol of H2) * (1 mol of XO/1 mol of X) * (16.00 g/mol of oxygen + atomic mass of X)

Substituting the given values, we get:

atomic mass of X = (3.6 g / V) * (0.5) * (1 / 1) * (16.00 g/mol + atomic mass of X)

Multiplying out, we get:

atomic mass of X = (1.8 g / V) * (16.00 g/mol + atomic mass of X)

Solving for atomic mass of X, we get:

atomic mass of X = (1.8 g / V) * 16.00 g/mol / (1 - 1.8 g / V)

Substituting V = 22.4 L (the volume of 1 mole of gas at STP), we get:

atomic mass of X = (1.8 g / 22.4 L) * 16.00 g/mol / (1 - 1.8 g / 22.4 L)

atomic mass of X ≈ 56.1 g/mol

Therefore, the RAM of X is approximately 56.1 g/mol, and the minimum volume of hydrogen used in the reaction is approximately 22.4 L at STP.

The answer is 4 hydrogen 3 oxygen

Answer: 2.408*10^24 in a mole or 4 in one molecule.

Explanation:

Answer:

Maximum expected yield = 87.2%

Explanation:

Equations of reactions:

Main reaction: N₂O₄(l) + 2N₂H₄(l) ---> 3N₂(g) + 4H₂O(g)

Side reaction:  2N₂O₄(l) + N₂H₄(l) ----> 6NO(g) + 2H₂O(g)

Molar mass of N₂O₄ = 92 g/mol; molar mass of N₂H₄ = 32 g/mol; molar mass of N₂ = 28 g/mol; molar mass of of NO = 30 g/mol; molar mass of water = 18 g/mol

In the main reaction, 92 g of N₂O₄ reacts with 2 * 32 g of N₂H₄ to produce 3 * 14 g of N₂.

101.1 g of N₂O₄ will react with 2 * 32 * 101.1 / 92 g of N₂H₄ = 70.33 g of N₂H₄

N₂O₄ is the limiting reactant

101.1 g of N₂O₄ will react to produce 3 * 14 * 101.1 / 92 g of N₂ =  46.15 g of  N₂

In the side reaction, (6 * 30 g) of NO  is produced  from (2 * 92 g) of N₂O₄ and 32 g of N₂H₄

12.7 g of N₂O₄ will be produced from ( 2 * 92 * 12.7/180 g) of N₂O₄ and (32 * 12.7/180) g of N₂H₄ to produce

mass of N₂O₄ used = 12.98 g

mass of N₂H₄ used = 2.26 g

mass of N₂O₄ left for main reaction = 101.1 - 12.98 = 88.12 g

mass of N₂H₄ left for main reaction = 101.1 - 2.26 = 98.84 g

In the main reaction, 92 g of N₂O₄ reacts with 2 * 32 g of N₂H₄ to produce 3 * 14 g of N₂

88.12 g of N₂O₄ will react with 2 * 32 * 88.12 / 92 g of N₂H₄ = 61.30 g of N₂H₄

N₂O₄ is the limiting reactant.

88.12 g of N₂O₄ will to react produce 3 * 14 * 88.12 / 92 g of N₂ =  40.23 g of  N₂

Percentage yield = (theoretical yield/actual yield) * 100%

Percentage yield = (40.23/46.15) * 100% = 87.2%

Therefore, maximum expected yield = 87.2%

Answer:

20m/s²

Explanation:

Step 1: rearrange the formula N=ma: a=N/m

Step 2: divide 120 by 4: 20m/s²

Hope that helps

An electron has a negative charge.

The charge of an electron is a fundamental property of the particle, and it is denoted by the symbol "e." The magnitude of the charge of an electron is approximately 1.602 × 10^-19 coulombs (C). This value is considered the elementary charge and is used as a reference for other charges. The charge of an electron plays a significant role in determining the behavior and interactions of atoms and molecules. It is opposite in sign to the charge of a proton, which is positive. The electron's charge allows it to interact with other charged particles, such as protons and ions, through electrostatic forces. Electrons are subatomic particles that orbit the nucleus of an atom in specific energy levels or orbitals. They contribute to the overall stability and chemical properties of atoms and participate in chemical bonding and reactions. The movement of electrons between atoms is what enables the formation of chemical bonds and the sharing or transfer of electrons to create ions. In summary, the charge of an electron is negative, and it plays a fundamental role in the structure and behavior of atoms and molecules.

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Answer:

14.9 mol

Explanation:

To find the number of moles in a given mass of a sample of sodium chloride (NaCl), we can multiply the number of grams in the sample by the molar mass of sodium chloride, which is 58.44 g/mol.

871 g × (1 mol / 58.44 g)

= 871/58.44 mol

≈ 14.9 mol

Note that we rounded to 3 significant figures in the final answer because that is how many significant figures were given in the mass measurement of the sodium chloride sample.

Answer:

fou maybe

Explanation:

it was my answer hehe

Answer:2

Explanation:

Because it is

The change in the free energy of the reaction  is given by  207.3 kJ.

The change in free energy (ΔG) is a measure of the maximum amount of work that can be extracted from a chemical reaction. It is calculated as the difference between the free energy of the products and the free energy of the reactants, and is expressed in units of energy (such as joules or calories) per mole of reaction.

Using the formula;

ΔG = ΔH - TΔS

ΔG = 163.2 - (298 * (-148))

ΔG = 207.3 kJ

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Answer:0.899076923

Explanation:

Na = 22.99

Cl =35.45

Add them together u get the molar mass of NaCl =58.44

Divide 58.44 by 65

U get 0.899076923

Answer:

Average Atomic Mass= 63.5 amu

Explanation:

Average Atomic Mass Equation:

(Mass 1)(% Abundance) +(Mass 2)(% Abundance)

Plug in Variables:

Make sure to convert the percentages into decimals. (Left two places)

Use the order of operations when solving.

(62.9)(0.692) + (64.9)(0.308) = AAM

Multiply each side

43.5268 + 19.9892 = AAM

Add the products together

63.516 = AAM

Add proper unit and satisfy the 3 significant figures needed

63.5 amu

Answer:

4

Explanation:

2+2=4

From the calculations, the change in energy is - 190 J.

From the first law of thermodynamics, the energy is neither created nor destroyed but is transformed from one form to another.

From the law;

U = q + w

U = internal energy

q = heat

w = work

Since work is done on the surroundings and the gas absorbs heat then;

U = 132 J - 322 J

U = - 190 J

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