Please help

Calculate the standard free-energy change at 25°C for the following reaction.
3Cu(s) + 2NO3(aq) + 8H+ (aq) 3Cu²+ (aq) + 2NO(g) + 4H₂O(1).
Use standard reduction electrode potentials.

Answer:

1000 K

Explanation:

Given data

We can find the temperature of carbon dioxide using the ideal gas equation.

\(P \times V = n \times R \times T\\T = \frac{P \times V}{n \times R} = \frac{0.8210atm \times 50L}{0.5mol \times \frac{0.08206atm.L}{mol.K} }=1000 K\)

The temperature of the gas is 1000 K.

We can see that an atom with 14 protons, 14 neutrons, and 16 electrons is unstable, and has a -2 charge.

So the correct option is the third one.

An atom with 14 protons, 14 neutrons, and 16 electrons is not stable. The number of protons in an atom, also known as its atomic number, determines its element and its chemical properties. In this case, the atom has 14 protons, which corresponds to the element silicon (Si) on the periodic table.

For an atom to be stable, it should have a balanced number of protons and electrons. Electrons are negatively charged particles that orbit the nucleus of an atom in energy levels or electron shells. The number of electrons in a stable atom should be equal to the number of protons, resulting in a neutral charge overall.

In this case, the atom has 14 protons and 16 electrons, which means it has two more electrons than protons, resulting in a net charge of -2. This is an example of an ion.

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Answer:Many nocturnal animals have a mirror-like layer, called the tapetum, behind the retina, which helps them make the most of small amounts of light.

Explanation:

For Test One, phenotype ratio is Short fur : Long fur = 2 : 0; For Test Two, the phenotype ratio is Short fur : Long fur = 3 : 1; For Test Three, the phenotype ratios will be Short fur : Long fur = 0 : 2

For Test One:

Parent 1: FF (homozygous dominant for short fur)

Parent 2: Ff (heterozygous for short fur)

The Punnett square for this cross will give the following genotype ratios:

FF : Ff = 1 : 1

And the corresponding phenotype ratios will be:

Short fur : Long fur = 2 : 0 or 100% short fur

For Test Two:

Parent 1: Ff (heterozygous for short fur)

Parent 2: Ff (heterozygous for short fur)

The Punnett square for this cross will give the following genotype ratios:

FF : Ff : ff = 1 : 2 : 1

And the corresponding phenotype ratios will be:

Short fur : Long fur = 3 : 1 or 75% short fur and 25% long fur

For Test Three:

Parent 1: ff (homozygous recessive for long fur)

Parent 2: ff (homozygous recessive for long fur)

The Punnett square for this cross will give the following genotype ratios:

ff : ff = 1 : 0

And the corresponding phenotype ratios will be:

Short fur : Long fur = 0 : 2 or 100% long fur

For this investigation, the test variable is the breed of hamster and the outcome variable is the phenotype of the hamster.

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The body of scientific knowledge is based on different Observations (Option C).

Observations in the scientific method are fundamental because it is the first step to raising scientific questions that may be explained through plausible hypotheses. Subsequently, hypotheses must be tested by experimental procedures.

In conclusion, the body of scientific knowledge is based on different Observations (Option C).

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A leaking tap that drops water at the rate of 3 drops every second, will leak 259.2 L in a day.

We know that a leaking tap drops water at the rate of 3 drops every second and that each drop is approximately 1 ml. The milliliters of water dropped every second are:

\(\frac{3drop}{1s} \times \frac{1mL}{1drop} = \frac{3mL}{1s}\)

We want to know the number of seconds in 1 day. We will use the following conversion factors:

\(1day \times \frac{24h}{1day} \times \frac{60min}{1h} \times \frac{60s}{1min} = 86400 s\)

3 mL of water are dropped every second. The mL of water dropped in 86400 s are:

\(86400 s \times \frac{3mL}{1s} = 259200 mL\)

Finally, we will convert mL to L using the conversion factor 1 L = 1000 mL.

\(259200 mL \times \frac{1L}{1000 mL} = 259.2 L\)

Approximately 259.2 L of water will be dropped in 1 day.

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Answer:

Vapor pressure is between vapor pressures of the pure liquids.

Explanation:

Vapor pressure is between vapor pressures of the pure liquids.

The concentration of acetic acid in the initial solution is 0.267M

Concentration is a measure of the amount of solute that has been dissolved in a given amount of solvent or solution

Here given data is

Acetic acid = 35.00 mL

8.75 mL of 0.0500 M Sr(OH)₂ for its neutralization

We have to calculate concentration of acetic acid in the initial solution = ?

So the reaction is

CH₃CO₂H + NaOH → CH₃CO₂Na + H₂O

That means the moles of NaOH added = moles acetic acid in the solution

So, to solve this problem we need to find the moles of NaOH added to find the mole of acetic acid and its concentration using its volume as follow

Moles of NaOH

18.75 mL = 0.01875 ×(0.0500mol/L) = 0.009375 mole of NaOH = mole of acetic acid

So the molarity of acetic acid =  0.009375 mole /0.035L = 0.267M

So the concentration of acetic acid in the initial solution is 0.267M

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The volume occupied by the 0.75 mole of the gas at 295 K and a pressure of 1.5 atm is 12.11 L

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

Ideal gas equation is written as shown below:

PV = nRT

When we input the given parameters, the volume occupied is obatined as:

1.5 × V = 0.75 × 0.0821 × 295

Divide both sides by 4.31

V = (0.75 × 0.0821 × 295) / 1.5

V = 12.11 L

Thus, from the above calculation, we can say that the volume occupied by the gas is 12.11 L

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Perch, frog, pigeon, and other species evolution would not have arisen prior to the derived shared trait of jaws and after the common ancestor.

The development of jaws in the bodies of our ancestors was a critical phase in the evolution of vertebrates, including humans. The earliest jawed vertebrates, called gnathostomes, descended from jawless fish and appeared in the fossil record around 420 million years ago.

Rats and people are both warm-blooded creatures that give birth to live children; both have similar organs, such as hearts and livers; both have comparable neurological systems; both employ comparable hormones to regulate body functions.

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The amount of heat energy produced when 1 g of hydrogen and 2 g of nitrogen are reacted, is -6.61 KJ

First, we shall obtain the limiting reactant. Details below:

3H₂ + N₂ -> 2NH₃

From the balanced equation above,

28 g of N₂ reacted with 6 g of H₂

Therefore,

2 g of N₂ will react with = (2 × 6) / 28 = 0.43 g of H₂

We can see that only 0.43 g of H₂ is needed in the reaction.

Thus, the limiting reactant is N₂

Finally, we the amount of heat energy produced. Details below:

3H₂ + N₂ -> 2NH₃ ΔH = -92.6 KJ

From the balanced equation above,

When 28 grams of N₂ reacted, -92.6 KJ of heat energy were produced.

Therefore,

When 2 grams of N₂ will react to produce = (2 × -92.6) / 28 = -6.61 KJ

Thus the heat energy produced from the reaction is -6.61 KJ

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Answer: \(y = \frac{1}{4}x-3\)

Explanation:

To find the inverse of an equation, follow these steps:

We are given the equation \(f(x) = 4x + 12\) , so replace f(x) with x.

Then, replace x with y.

Your new equation:

\(x = 4y + 12\)

Now, solve for y:

\(x = 4y + 12\\\\4y = x - 12\\\\y = \frac{1}{4}x-3\)

This equation is the inverse of f(x), or g(x).

At 40°C, the maximum amount of KNO₃ that can dissolve in 200 g of water is 130 g, but since only 110 g of KCl was added, all the KCl will dissolve, and 71.5 g of KNO₃ will dissolve.

To determine how much KNO₃ will dissolve, we need to compare the amount of KCl that was added to the maximum amount of KNO₃ that can dissolve at the same temperature.

First, we can find the maximum amount of KNO₃ that can dissolve in 200 g of water at 40°C, which is given as 65 g/100 g of water

Maximum amount of KNO₃ that can dissolve

= 65 g/100 g x 200 g

= 130 g

This means that at most, 130 g of KNO₃ can dissolve in 200 g of water at 40°C.

Next, we need to compare the amount of KCl added to the maximum amount of KNO₃ that can dissolve.

The amount of KCl added is 110 g, which is less than the maximum amount of KNO₃ that can dissolve (130 g). Therefore, all of the KCl will dissolve and some of the KNO₃ will dissolve.

To find the amount of KNO₃ that will dissolve, we need to calculate how much KNO₃ would be in 110 g of the solvent (water) if it were saturated with KNO₃

Amount of KNO₃ in 110 g of water

= 65 g/100 g x 110 g

= 71.5 g

This means that 71.5 g of KNO₃ will dissolve in 110 g of water at 40°C.

Therefore, the amount of KNO₃ that will dissolve in the 200 g of water containing 110 g of KCl is 71.5 g.

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Answer:

The energy of a mole of photon is 2.99x10⁵ J.

Explanation:

First, we need to remember that in 1 mol of photons we have 6.02x10²³ photons.

The energy is given by:

\( E = Nh\nu \)

Where:

h: is the Plank's constant = 6.62x10⁻³⁴ J.s

ν: is the frequency = 7.5x10¹⁴ Hz    

N: is the number of photons = 6.02x10²³ photons

Hence, the energy of a mole of photon is:

\( E = Nh\nu = 6.02 \cdot 10^{23}*6.62 \cdot 10^{-34} J*s*7.5 \cdot 10^{14} Hz = 2.99 \cdot 10^{5} J \)

I hope it helps you!      

The compound that is shown as X can be seen in the option labelled C

The process of esterification involves the condensation of an alcohol (or phenol) with an acid to produce an ester. To create the ester bond, the water molecule must be removed from the alcohol and acid (dehydration).

Usually, an acid catalyst is used to catalyze the reaction, which makes it easier to remove water and encourages the creation of the ester. The acid catalyst aids in protonating the acid's carbonyl oxygen, which increases its electrophilicity and makes it more vulnerable to alcohol's nucleophilic attack.

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ANSWER

Fluorine

EXPLANATION

Based on the information provided, fluorine has the highest electronegativity and it form strong ionic bond with metals

Fluorine has 7 valence electron at its outermost shell and it readily to take on electron from its neighboring atom.

Therefore, the answer is fluorine

If closer means that it is inner, then it would be they are closer and made of rocks.

PLEASE GIVE BRAINLIEST!!!!

Answer:

and now you have a nail in your wood :)

Answer:

D) the higher the frequency the greater the energy of light.

Explanation:

Energy and frequency of light are directly connected. The higher the frequency ,the greater the energy of light.

As frequency increases, the energy of light also increases.

Mathematically;

 Energy  = hf

   h is planck's constant

   f is the frequency.

Sodium carbonate, often referred to as Na2CO3, is a chemical compound composed of atoms of sodium (Na), carbon (C) and oxygen (O).

It is also sometimes called washing soda or soda ash. At room temperature, sodium carbonate is a white, crystalline solid that is very soluble in water. According to the chemical formula of the sodium carbonate molecule, Na2CO3, each molecule consists of two sodium atoms (Na), one carbon atom (C) and three oxygen atoms (O). The atomic configuration in sodium carbonate is shown in the given diagram.

A trigonal planar arrangement is formed when the central carbon atom is bonded to three oxygen atoms. The structure of sodium carbonate is completed by two sodium atoms joined to oxygen atoms.

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Answer:

Explanation:

The formula for gravitational potential energy is the mass*gravity*height. Therefore, the greater the distance from the ground, the higher the gravitational potential energy.

Answer: The amount of gravitational potential energy an object has depends on mass of the object and height of the object above ground. Objects that are at large height above the ground have more potential energy. Similarly, objects that are at small height above the ground have less potential energy.

Answer

Number of atoms of Li =

Explanation

Given

moles of Li = 3 moles

Required: Number of atoms of Li

Solution

Answer:

holaholaholaholaholaholaholahola

The volume occupied by the oxygen gas at a pressure of 210 kPa and a temperature of 50°C is 0.126 liters, rounded to three significant figures.

To calculate the volume occupied by the oxygen gas at a pressure of 210 kPa and a temperature of 50°C, we can use the ideal gas law equation:

PV = nRT

where:

P = pressure

V = volume

n = number of moles

R = ideal gas constant

T = temperature

First, we need to convert the given temperature from Celsius to Kelvin by adding 273.15:

T = 50°C + 273.15 = 323.15 K

Next, we rearrange the ideal gas law equation to solve for volume:

V = (nRT) / P

To find the number of moles (n), we can use the answer from question 27, which is the mass of oxygen gas:

m = 32 g

Using the molar mass of oxygen (O₂) which is approximately 32 g/mol, we can calculate the number of moles:

n = m / M = 32 g / 32 g/mol = 1 mol

Now we have all the values needed to calculate the volume:

V = (1 mol * 8.314 J/(mol*K) * 323.15 K) / 210,000 Pa

Using the ideal gas constant (R) of 8.314 J/(mol*K) and the pressure of 210 kPa (which is equivalent to 210,000 Pa), we can substitute these values into the equation and solve for volume.

V = 0.126 liters.

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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:

Wavelength (typically measured in nanometers) is the distance between two points in a wave.Frequency (typically measured in Hertz) is the number of waves in a specific time . Frequency and wavelength have both direct and inverse relationships. The crucial difference between frequency and wavelength is that frequency shows the total number of wave oscillations in a given time. As against wavelength specifies the distance between two specific points of a wave.

Explanation:

Frequency is how often something changes per second be it amplitude of a voltage on a wire or be it the bobbing back and forth of a bobblehead. Frequency is how often something moves up and down in a second. If a bobble head moves forward and backward in one second then it has a bobbling frequency of 1 Hertz (Hz). The unit of frequency is Hertz (Hz) or # of cycles or oscillations per second. A wavelength is measured in distance like meters (m). For photons or light or radiowaves the equation is wavelength=speed of light/frequency.

Answer:

Wavelength (typically measured in nanometers) is the distance between two points in a wave, while frequency is how often something changes per second be it amplitude of a voltage on a wire or be it the bobbing back and forth of a bobblehead.

Answer:

5.67 + 0.00032 = 5.67032

Usually for decimal answers, we write 2 digits that come after decimal. We can't write all the numbers that come after the decimal because sometimes it can go on for infinte times, so we write the 2 numbers that come after decimal. So, 5.67 is the answer.

5.7 is also right if you round off the answer but 5.67 is more accurate.

Hope this helped!

Pls mark brainliest

Answer:

For the question given, this shows that the answer is in 2 d.p. (2 decimal places). This means that the final answer has been rounded to 2 numbers after the decimal point!

We know that it would be 5.67 as the number after the 7 is 0, this means that the answer would be rounded down or in other terms the 7 would stay the same.

When answering a question, most of the time we would be told what decimal place to round the number to!

Hope this helps, have a lovely day! :)

The compound has an empirical formula of \(K_2H_2P_2O_8\) and a molecular formula of \(K_2HPO_4\).

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The correct question would be as

The composition of a compound is 28.73% K. 1.48% H, 22.76% P, and 47.03% O. The molar mass of the compound is 136.1 g/mol. What is the Molecular Formula of the compound?

\(KH_2PO_4\\KH_3PO_4\\K_2H_4P_20_{12}\\K_2H_3PO_6\)

anode is oxidation

so look at the reduction potential for Pt and Kl

the one with the smaller reduction potential will undergo oxidation

the one with the larger reduction potential will undergo reduction

you have to flip the equation that undergoes oxidation because the reduction table always gives reduction equations