The students use the specific heat equation (above) to determine what they need to measure to calculate iron's specific heat.

Which student has the best understanding of the terms in the Specific Heat Equation?

Student A: "ΔH" stands for change in heat energy. "m" stands for the mass of the system. "ΔT" stands for the change in the temperature of the system.

Student D: "ΔH" stands for change in heat energy. "m" stands for the mass of the surroundings. "ΔT" stands for the change in the temperature of the surroundings.

Student C: "ΔH" is the initial heat energy in the surroundings. "m" stands for mass of the surroundings. "ΔT" stands for the final temperature of the surroudings.

Student B: "ΔH" is the initial heat energy in the system. "m" stands for mass of the system. "ΔT" stands for the final temperature of the system.

To determine the number of moles of Fe2+ in a 2.0g sample that is 80% by mass of FeCl2, we need to consider the molar mass of FeCl2 and the mass of Fe2+ in the sample.

The molar mass of FeCl2 can be calculated by adding the atomic masses of iron (Fe) and two chlorine (Cl) atoms. The atomic mass of iron is 55.845 g/mol, and the atomic mass of chlorine is 35.453 g/mol.

Molar mass of FeCl2 = (1 × atomic mass of Fe) + (2 × atomic mass of Cl) = 55.845 g/mol + (2 × 35.453 g/mol)

Next, we need to determine the mass of Fe2+ in the 2.0g sample. Since the sample is 80% by mass of FeCl2, the mass of FeCl2 in the sample can be calculated as:

Mass of FeCl2 = 80% × 2.0g = 0.8 × 2.0g

To find the mass of Fe2+ in the sample, we need to multiply the mass of FeCl2 by the ratio of the atomic masse:

Mass of Fe2+ = Mass of FeCl2 × (Molar mass of Fe2+ / Molar mass of FeCl2)

Finally, we can convert the mass of Fe2+ to moles using its molar mass:

Moles of Fe2+ = Mass of Fe2+ / Molar mass of Fe2+

Performing the calculations will give us the number of moles of Fe2+ in the given sample.

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The electrostatic potential energy between an electron and a proton that are separated by 53pm is 4.27 × 10^-18 J.

The electrostatic potential energy between two charged particles can be calculated using the

formula U = k*q1*q2/r,

where:

k is the Coulomb constant,

q1 and q2 are the charges of the two particles, and

r is the distance between them.

In this case, we have q1 = -1.60*10^-19 C (charge of the electron), q2 = 1.60*10^-19 C (charge of the proton), and r = 53 pm = 5.3*10^-10 m. Plugging these values into the formula, we get:

U = (8.99*10^9 N m2/C2)*(-1.60*10^-19 C)*(1.60*10^-19 C)/(5.3*10^-10 m)

U = 4.27 × 10^-18 J

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Answer: B. 0.36 moles

Explanation:

According to ideal gas equation:

\(PV=nRT\)

P = pressure of gas = 260 mm Hg = 0.342 atm         (760 mm Hg= 1atm)

V = Volume of gas = 31.0 L

n = number of moles = ?

R = gas constant =\(0.0821Latm/Kmol\)

T =temperature =\(87^0C=(87+273)K=360K\)

\(n=\frac{PV}{RT}\)

\(n=\frac{0.342atm\times 31.0L}{0.0821L atm/K mol\times 360K}=0.36moles\)

Thus the moles of gas present are 0.36

The energy of light with a frequency of 3 × \(10^{9}\) Hz is equal to 1.988 x \(10^{-24}\) Joules.

The formula to calculate the energy is - E = h × f

where,

E = energy

h =  Planck's constant (6.626 × \(10^{-34}\) J-sec)

f  = frequency of the light

Put the given values of 'f' and 'h' in the above equation -

E = 6.626 × \(10^{-34}\) × 3 × \(10^{9}\)

  = 19.88 × \(10^{-25}\)

  = 1.988 × \(10^{-24}\) J

So, a light wave with 3 x \(10^{9}\) Hz has an energy of 1.988 x \(10^{-24}\) J.

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To increase the solubility of NaClO (sodium hypochlorite) in water, the most effective procedure would be option b) raising the temperature of the solvent.

Generally, solubility of most solid solutes in a solvent increases with temperature. As the temperature rises, the kinetic energy of the water molecules increases, leading to more frequent and energetic collisions with the solute particles.

This results in the breaking of intermolecular bonds between solute particles and facilitates their dispersion throughout the solvent, thereby increasing solubility.Option a) increasing the pressure on the surface of the solvent is unlikely to have a significant effect on the solubility of NaClO in water since it is not a gas solute.

Option c) increasing the surface area of the solute may enhance the rate of dissolution, but it would not necessarily increase the overall solubility. Option d) stirring the solute and solvent mixture can aid in the dissolution process by promoting the contact between the solute and solvent, but it may not significantly impact the solubility itself.Option b is correct.

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Among the given compounds, nitrogen gas (N2) has a vibration that is infrared inactive. The other compounds, H2S, 2-butyne, ethene, and 1-butyne, have vibrations that are infrared active.

Infrared spectroscopy is a technique used to identify functional groups and molecular vibrations in a compound. When a molecule absorbs infrared radiation, it undergoes a change in vibrational energy levels.

To be infrared active, a molecule must have a change in dipole moment during a vibration. This occurs when there is a net movement of charge within the molecule. Among the given compounds, H2S, 2-butyne, ethene, and 1-butyne all have polar bonds and undergo changes in dipole moment during vibrations. Therefore, they are infrared active.

On the other hand, nitrogen gas (N2) consists of a homonuclear diatomic molecule with a nonpolar bond. Since there is no change in dipole moment during the vibrations of N2, it is infrared inactive.

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Answer:

Explanation:

Firstly, it should be noted that melting and freezing points are the same. Thus, when a substance melts at a certain temperature, it means it can also start freezing/solidifying at that same temperature. That been said, when the substance P is a solid at a certain temperature, the other compound Q will boil at that same temperature and hence will be a gas at that same temperature.

If P is solid, it simply means that Q must still be in the liquid state.

From the question, we can see that, the melting point of P and the boiling point of Q are the same. The melting point of a substance is the temperature at which the solid turns to liquid while the boiling point of a substance is the temperature at which a liquid turns to a gas.

If P is solid, it simply means that Q must still be in the liquid state. It has not yet started boiling since the melting point of P and the boiling point of Q are the same.

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The energy a mosquito obtains when biting a human is derived from the nutrients present in the blood, which serve as a source of sustenance and facilitate the reproductive cycle of female mosquitoes.

When a mosquito bites a human, it does not directly obtain energy in the form of electricity or any other conventional type of energy. Instead, the mosquito gains sustenance through its feeding behavior. Mosquitoes are hematophagous insects, meaning they feed on the blood of other animals, including humans.

The energy obtained by a mosquito from biting a human comes from the nutrients present in the blood. Mosquitoes have evolved specialized mouthparts that enable them to pierce the skin and access blood vessels. Once they penetrate the skin, they release saliva containing enzymes that prevent blood clotting, allowing them to extract the necessary nutrients.

The primary source of energy for mosquitoes is the sugar found in nectar, which provides them with the fuel required for flight and basic metabolic processes. However, female mosquitoes require additional nutrients, such as proteins and iron, which are crucial for egg development. By biting a human and consuming blood, female mosquitoes acquire these essential nutrients, which contribute to their reproductive capabilities.

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The medullary index of hair is the ratio of medullary diameter to the diameter of hair. Thus the medullary  of  hair with 110 microns and medulla diameter of 58 microns is 0.533. This is an animal hair.

Medullary index of hair is the ratio of diameter of the medullary part and the diameter of the hair strand. From this value, we can identify whether the sample hair is of humans or animals.

Hair is made proteins called keratin. The protein structure of hair vary from human to  human even one hair strand to the other and similar way it is different in animal hair too.

The hair strand of humans are thin than the hair strands of animals. Thus the medullary index of humans is 0.333 or less. If the index is 0.50 or greater it is of animals.

Here the diameter of hair is 110 microns and that of medulla is 58 microns thus medullary index is 58/110 = 0.55 microns. Which means that it is an animal hair.

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Answer:true

Explanation:

i did the same question a minute ago :>

Answer:Read explanation

Explanation:

A polar molecule has a net dipole as a result of the opposing charges (i.e. having partial positive and partial negative charges) from polar bonds arranged asymmetrically. Water (H2O) is an example of a polar molecule since it has a slight positive charge on one side and a slight negative charge on the other. A non polar substance we be the opposite of what I said

Option A, BF, does not violate the octet rule, option B, XeO, satisfies the octet rule for all atoms, option C, Ne, is a noble gas and already has a complete octet, and option D, AICI3, has complete octets for both the atoms and does not violate any rules.

The incorrect Lewis structure is likely to be the one that violates the octet rule, has an incomplete octet or has an odd number of electrons.

In the given options, only option E, NH, violates the octet rule. Nitrogen has five valence electrons and each hydrogen has one valence electron. If we draw the Lewis structure for NH, we get three lone pairs on nitrogen and one unpaired electron.

This makes a total of nine valence electrons, which is one more than the total available. Therefore, NH does not follow the octet rule and is the incorrect Lewis structure.

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Answer:

liquid

Explanation:

There are three states of matter and these are the following:

1. Solid

2. Liquid

3. Gas

"Liquid" has particles that show movements in-between to that of the solid and liquid. The forces between these particles are weaker when compared to the forces of particles in solid. This allows it to take the shape and volume of the container without actually changing its volume. If you pour a liquid unto a heart-shape container, it will take the shape of the heart as its form (it has no fix shape).

Answer:

The answer to part c is the amount of moles of FeBr₃ that will be formed is approximately 0.179 moles

Explanation:

The given chemical reaction is 2Fe + Br₂ → 2FeBr₃

The mass of iron, Fe, in the reaction = 10 g

a) The amount of moles of iron that reacted = The mass of iron in the reaction/(The molar mass of iron)

The atomic mass of iron = 56 amu

Therefore, one mole of iron = 56 grams

The amount of moles of iron that reacted = 10/(56) ≈ 0.179

The amount of moles of iron that reacted ≈ 0.179 moles

b) The amount of moles of bromine that reacted = 3/2 × The amount of moles of iron that reacted

∴ The amount of moles of bromine that reacted = 3/2 × 0.179 ≈ 0.2685

The amount of moles of bromine that reacted ≈ 0.2685 moles

c) The amount of moles of FeBr₃ that will be formed = The amount of moles of iron in the reaction ≈ 0.179 moles

d) The mass of one molecule of FeBr₃ = Mass of 1 atom of iron, Fe + 3 × The mass of 1 atom of bromine, Br

∴ The mass of one mole of FeBr₃ =  56 + 3 × 80 = 296

The mass of one mole of FeBr₃ = The molar mass of FeBr₃ =  296 grams

The mass of FeBr₃ formed = The molar mass of FeBr₃ × The number of moles of FeBr₃ formed

∴ The mass of FeBr₃ formed = 296 × 0.179 ≈ 52.984

The mass of FeBr₃ formed  ≈ 52.984 grams

Answer:

Because Metal is a solid

Explanation:

Metal is a solid, meaning that it's atoms are closer together than a liquid's atoms.

Answer:

12.70

Explanation:

A pH meter will make short work of identifying the pH of your solution. These meters have a glass probe that measures a solution's ion concentration. To use a pH meter, place a small portion of your solution in a beaker or test tube, rinse the probe of the pH meter, and then place the probe into your solution.

Source:

https://sciencing.com/identify-solution-neutral-base-acidic-8346.html

pH depend on the temperature. At room temperature pH scale is between 0 to 14. pH of neutral solution is 7. pH meter is the only instrument to measure the pH of an unknown solution.

pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. More the value of hydronium ion concentration, more will be the solution acidic.

On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution.

pH meter is used to measure the pH of an unknown solution. A glass probe is attached to pH meters, that measure the concentration of hydrogen ion in unknown solution. Take the unknown solution in the beaker and then put the washed, clean glass probe in the solution. Now wait for a second to take the reading.

Therefore, pH meter is the only instrument to measure the pH of the solution.

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Measuring tool would you use to measure the area of a football field is used a tender wheel

If you need to measure much longer lengths for example the length of a football pitch then you could use a trundle wheel then you use it by pushing the wheel along the ground and it clicks every time it measures one meter and to measure the football field area then

Area = length×breadth

Area = 90m×45m

Area = 4.05m²

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If you added 0.5 g of sample 1 instead of 2.0 g, the freezing point temperature of the solution would decrease.

When a solute is added to a solvent, it disrupts the formation of the solvent's crystal lattice structure, lowering the freezing point of the solution. The extent to which the freezing point is lowered depends on the concentration of the solute particles in the solution. In this case, by reducing the amount of sample 1 from 2.0 g to 0.5 g, the concentration of solute particles in the solution would decrease.

Since the freezing point depression is directly proportional to the concentration of solute particles, a decrease in the amount of sample 1 would result in a smaller decrease in the freezing point temperature compared to if 2.0 g were added. In other words, the solution would experience a less significant decrease in freezing point temperature with only 0.5 g of sample 1.

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Answer:a= 0.49411764705882 m/s^2

Explication

Because of the formula a= f/m we had to divide the force with the mass to get the acceleration

To find the resulting acceleration of the object, you can use Newton's second law of motion, which states that the acceleration of an object is directly proportional to the force applied to it and inversely proportional to its mass. The resulting acceleration of the object is approximately 0.494 \(ms^{2}\).

Mathematically, this law is represented as F=m⋅a

Where:

F is the force applied to the object (42 N in this case).

m is the mass of the object (85 kg in this case).

a is the acceleration of the object (what we're trying to find).

Rearranging the formula to solve for acceleration:

\(a=\frac{f}{m}\)

​Plugging in the given values:

\(a= \frac{42N}{85kg} \\=0.494 ms{2}\)

So, the resulting acceleration of the object is approximately 0.494 \(ms^{2}\)

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The ONF molecule consists of one oxygen atom (O), one nitrogen atom (N), and one fluorine atom (F). Let's propose a plausible Lewis structure, geometric structure, and hybridization scheme for this molecule.

1. Lewis Structure:
To determine the Lewis structure, we need to count the total number of valence electrons in the ONF molecule. Oxygen has 6 valence electrons, nitrogen has 5, and fluorine has 7. Therefore, the total number of valence electrons is 6 + 5 + 7 = 18.

The Lewis structure is typically represented by dots and lines. In this case, we start by connecting the atoms using single bonds. Each single bond consists of 2 electrons. Let's connect the atoms:

O - N - F

Next, we distribute the remaining electrons to fulfill the octet rule for each atom. The octet rule states that atoms tend to gain, lose, or share electrons in order to have 8 electrons in their outermost shell (except for hydrogen, which only needs 2 electrons). Since oxygen and nitrogen have already satisfied the octet rule, we place the remaining 8 electrons on the fluorine atom, like so:

O - N - F
: :
Now, we count the number of valence electrons used in our structure. Oxygen used 6, nitrogen used 5, and fluorine used 8. The total is 6 + 5 + 8 = 19. Since this exceeds the total number of valence electrons we initially counted (18), we need to make an adjustment.

To make the adjustment, we remove one electron from the fluorine atom, which forms a lone pair on the oxygen atom:

O - N - F
:
This adjustment results in a Lewis structure with a formal charge of +1 on nitrogen and a formal charge of -1 on oxygen. This is a plausible Lewis structure for the ONF molecule.

2. Geometric Structure:
To determine the geometric structure, we need to consider the repulsion between electron pairs. In the ONF molecule, we have two bonded pairs (the single bond between oxygen and nitrogen and the single bond between nitrogen and fluorine) and two lone pairs on oxygen.

According to VSEPR theory, the repulsion between electron pairs causes the molecule to adopt a specific shape. In this case, the ONF molecule has a tetrahedral electron-pair geometry. The bonded pairs and lone pairs arrange themselves to maximize the distance between them.

3. Hybridization Scheme:
The hybridization scheme refers to the hybrid orbitals that form during the bonding process. In the ONF molecule, oxygen and nitrogen both have sp3 hybridization.

In sp3 hybridization, one s orbital and three p orbitals hybridize to form four sp3 hybrid orbitals. These hybrid orbitals are used to form the sigma bonds between the atoms in the ONF molecule.

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The solubility of ionic compounds depends on the nature of the ions and their charges.

Ionic compounds containing Na+, K+, and NO3- ions are generally soluble in water because they have small ionic radii and weak ionic interactions. On the other hand, ionic compounds containing Ba2+, PO4-3, and CO3-2 ions tend to be less soluble in water because they have larger ionic radii and stronger ionic interactions.

Ba2+ and PO4-3 ions tend to form insoluble compounds, such as Ba3(PO4)2, while Ba2+ and CO3-2 ions can also form insoluble compounds, such as BaCO3. K+ and CO3-2 ions may also form an insoluble precipitate when combined with certain cations such as Ba2+. Overall, the solubility of ionic compounds can be influenced by factors such as temperature, pH, and the presence of other ions in the solution.

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Answer:

Read below

Explanation:

The effects of London dispersion forces are most obvious in systems that are very non-polar (e.g., that lack ionic bonds), such as hydrocarbons and highly symmetric molecules such as bromine (Br2, a liquid at room temperature), iodine (I2, a solid at room temperature).

Answer:

B

Explanation:

because HCl donates a proton to water. Therefore, HCl is an acid. H2O accepts a proton from HCl. Therefore, H2O is a base.

That oil sands executive is greedy and heartless and therefore can't be trusted when she claims is Ad hominem attack. So, Option B is correct.

4-  The argument in question 4 is an example of an ad hominem attack. This is due to the argument's focus on the character of the oil sands executuive rather than the actual problem, which is how to improve the company's environmental record.

The argument holds that the executive cannot be believed when she says she wants to improve the company's environmental record because she is avaricious and callous. This is an error in logic, though, as the executive's character may not necessarily be related to the company's environmental policies.

5-  The argument in question 5 is an example of an appeal to ignorance. This is because the argument states that there is no proof that humans are causing climate change, so it must be natural causes. Just because there is no conclusive proof that humans are causing climate change, it does not mean that they are not.

The argument assumes that just because there is no evidence to the contrary, the argument must be true. This is a logical fallacy.

So, Option B is correct.

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Answer:

binary

Explanation:

Answer:

have you tried to convert the energy into a simpler form to help

Explanation:

the numbers may be converted with the right equation

The molar mass of the substances having hydrogen will have mass of 1.01 u present in them.

Molar mass of a compound or a molecule is defined as the mass of the elements which are present in it.The molar mass is considered to be a bulk quantity not a molecular quantity. It is often an average of the of the masses at many instances.

The molecular mass and formula mass are used as synonym for the molar mass.It does not depend on the amount of substance which is present in the sample.It has units of gram/mole.

Molar masses of an element are given as relative atomic masses while that of compounds is the sum of relative atomic masses which are present in the compound.

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The false statement about buffers is: d) a buffer always consists of a weak acid and a soluble ionic salt of the weak acid.

Buffers are solutions that can resist changes in pH when small amounts of acids or bases are added. They typically consist of a weak acid and its conjugate base (or a weak base and its conjugate acid). The weak acid and its conjugate base are present in equilibrium, allowing the buffer to accept or donate protons to maintain a relatively constant pH. Option d is false because a buffer can consist of a weak acid and its conjugate base, or a weak base and its conjugate acid. It is not necessary for a buffer to always include a soluble ionic salt.

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