Density is a common physical property of substances that can give insight into the structure of the substance on the atom or molecular level. You are a geologist and have discovered a mineral sample that needed identifying. The first method of choice is the density of the sample. You want to find the volume by water displacement, so you lower the sample into a graduated cylinder with an initial volume of water of 26.90 mL. The volume of water rises to 43.70 mL. You also mass the sample and determine it to be 25.10 g. From this information determine the density of the mineral sample. Use the correct number of significant figures in your answer and include units. Your Answer: Answer units

Option A, a magnet, is the best choice for separating small iron filings from a mixture with sand.

The best option to separate small iron filings from a mixture with sand would be:

A) a magnet

Using a magnet is an effective method to separate iron filings from a mixture. Iron filings are magnetic, while sand is not. By placing a magnet near the mixture, the iron filings will be attracted to the magnet and can be easily separated from the sand. This process is known as magnetic separation.

To separate the iron filings, you can move the magnet over the mixture, and the iron filings will cling to the magnet. This can be repeated until all the iron filings have been separated from the sand.

Filter paper (option B) is not suitable for this purpose because it is primarily used for separating solid particles from a liquid or gas by filtration. In this case, we are dealing with a solid mixture, not a liquid or gas.

A hot plate (option C) is used for heating substances and would not be effective for separating iron filings from sand.

Running water (option D) may help in some cases to separate different components of a mixture, but in this specific scenario, where we want to separate iron filings from sand, using a magnet would be a more efficient and precise method.

In conclusion, option A, a magnet, is the best choice for separating small iron filings from a mixture with sand.

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Answer:

aldehyde

Explanation:

Answer: Submarine

Explanation:

Depends on the size and weight of the sailboat and submarine but the submarine will have more momentum because it is heavier.

Answer:

1. Born Haber cycle is used to calculate enthalpy of formation of an ionic solid

2. Resonance structures are used to represent the bonding in some chemical species.

Explanation:

The Born–Haber cycle is a method popularly known in chemistry used in computing enthalpy. The enthalpy of formation of an ionic solid cannot be measured directly. The lattice enthalpy refers to the enthalpy change involved in the formation of an ionic compound from gaseous ions the process is exothermic process. A Born–Haber cycle works on the principle of Hess's law. It can be used to calculate the lattice enthalpy by comparing the standard enthalpy change of formation of the ionic compound from the elements to the enthalpy required to make gaseous ions from the elements.

Resonance is an idea introduced by Linus Pauling to explain chemical bonding from the valence bond perspective. The idea of resonance affords us the opportunity to describe the bonding in certain molecules by combining several structures called chemical or canonical structures. The real structure of the specie lie somewhere between the structures indicated by the resonance structures. The resonance structures of the nitrate ion are shown in the image attached.

If an asteroid created enough dust to block out the Sun, it would likely have a severe and devastating effect on life on Earth.

Green plants, which rely on sunlight for photosynthesis, would not be able to produce the energy they need to survive, leading to mass die-offs of vegetation. This would in turn have a cascading effect on the entire ecosystem, as animals that depend on plants for food would also struggle to survive. The lack of sunlight would also cause a decrease in temperature, which can have a negative impact on many organisms.

The lack of sunlight would also have a severe impact on the climate and weather patterns, leading to a "nuclear winter" scenario, where the temperature drops significantly, leading to the extinction of many species, including the human species, who rely on the food chain.

Answer:

Molecules of oxygen \(= 6.86 * 10^{23}\)

Explanation:

The balanced equation of reaction between iron and oxygen is  

4 Fe     +  3 O2  → 2 Fe2O3

4 moles of iron react with 3 moles of oxygen.

Mass of one mole of iron is 55.845

number of iron moles in 84.9 grams of solid iron is equal to

\(\frac{84.9}{55.845} \\= 1.52\)

Now 1 mole of iron will react with \(\frac{3}{4} = 0.75\) mole of oxygen

Thus 1.52 moles of iron will react with \(0.75 * 1.52 = 1.14\) moles of oxygen

Number of atoms of oxygen in 1.14 moles

\(1.14* 6.02 * 10^{23}\\\)

\(= 6.86 * 10^{23}\)

Higher temperatures result in an increase in kinetic energy, which allows the solvent molecules to more efficiently damage the intermolecularly attracted solute molecules.

Solubility of the solute in the solution is increased by heating saturated solution. Because the particles gain kinetic energy as the temperature rises, they move faster, increasing the likelihood of collisions and diffusion. By giving energy to break bonds in the material, more heat is added, which speeds up the dissolving reaction. This is the most typical instance in which a rise in temperature results in a rise in the solubility of solids.

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Answer: 4.76 * 10^2

476.

you bring the ending decimal to the first number and it takes you two hops to get the first number so that's what you put in the box after the 10

In the J = 0 state, the BrF molecule does not undergo any revolutions per second. In the J = 1 state, it undergoes approximately 0.498 revolutions per second, and in the J = 10 state, it undergoes approximately 15.71 revolutions per second.

To calculate the rotational constant B, we can use the formula:

B = 1 / (2 * π * Δν)

Where:

B = rotational constant

Δν = spacing between consecutive lines in the rotational spectrum

Given that the spacing between consecutive lines is 0.71433 cm^(-1), we can substitute this value into the formula:

B = 1 / (2 * π * 0.71433 cm^(-1))

B ≈ 0.079 cm^(-1)

The moment of inertia (I) of the molecule can be calculated using the formula:

I = h / (8 * π^2 * B)

Where:

h = Planck's constant

Given that the value of Planck's constant (h) is approximately 6.626 x 10^(-34) J·s, we can substitute the values into the formula:

I = (6.626 x 10^(-34) J·s) / (8 * π^2 * 0.079 cm^(-1))

I ≈ 2.11 x 10^(-46) kg·m^2

The bond length (r) of the molecule can be determined using the formula:

r = sqrt((h / (4 * π^2 * μ * B)) - r_e^2)

Where:

μ = reduced mass of the molecule

r_e = equilibrium bond length

To calculate the wavenumber (ν) of the J = 9+ to J = 10 transition, we can use the formula:

ν = 2 * B * (J + 1)

Substituting J = 9 into the formula, we get:

ν = 2 * 0.079 cm^(-1) * (9 + 1)

ν ≈ 1.58 cm^(-1)

To determine the most intense spectral line at room temperature (300 K), we can use the Boltzmann distribution law. The intensity (I) of a spectral line is proportional to the population of the corresponding rotational level:

I ∝ exp(-E / (k * T))

Where:

E = energy difference between the levels

k = Boltzmann constant

T = temperature in Kelvin

At room temperature (300 K), the population distribution decreases rapidly with increasing energy difference. Therefore, the transition with the lowest energy difference will have the most intense spectral line. In this case, the transition from J = 0 to J = 1 will have the most intense spectral line.

To calculate the number of revolutions per second, we can use the formula:

ω = 2 * π * B * J

Where:

ω = angular frequency (in radians per second)

J = rotational quantum number

For J = 0:

ω = 2 * π * 0.079 cm^(-1) * 0 = 0 rad/s

For J = 1:

ω = 2 * π * 0.079 cm^(-1) * 1 ≈ 0.498 rad/s

For J = 10:

ω = 2 * π * 0.079 cm^(-1) * 10 ≈ 15.71 rad/s

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Answer:

Explanation:

Mining:

    Mining is when certain substances are removed from the Earth, usually in large quantities. Mining can occur below the surface of the Earth via tunnels and caves. It can also occur at surface level through methods such as strip mining, which removes huge amounts of soil in the process

Answer:

D

Explanation:

The ratio of C6H12O6 (which will be referred to as "the carb") to oxygen is 1 to 6, so if we find an answer which has the same ratio, it should be chosen. A is 1:3
B is even worse with a ratio of the carb to oxygen of 1:2
C is the same as B, 1:2
D has a ratio of the carb to oxygen of 1:6, which is what we are looking for.

Based on the presence of fly larvae and the fixed lividity on the back side of the body, an appropriate estimate for the approximate time since death would be one to three days.

The correct answer is option C.

Based on the information provided, we can make some estimations regarding the approximate time since the person has been dead.

The presence of fly larvae in the body suggests that decomposition has started. Fly larvae, commonly known as maggots, are attracted to decaying organic matter and typically appear within a few days after death. Their presence indicates that some time has passed since the person's death.

Lividity, or livor mortis, refers to the pooling of blood in the lower parts of the body due to gravity after the heart has stopped pumping. The fact that lividity is permanently fixed on the back side of the body suggests that the body has been in that position for a significant amount of time after death.

Based on these factors, an appropriate estimate for the approximate time since death would be one to three days. This estimation is primarily based on the presence of fly larvae and the fixed lividity on the back side of the body.

Therefore, from the given information option C is the correct answer.

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INFORMATION:

We know that:

- A certain polyatomic ion contains 49 protons and 50 electrons

And we must find its net charge

STEP BY STEP EXPLANATION:

Atoms have the same number of protons and electrons, hence atoms are neutral.

Proton is positively charged and electron is negatively charged.

Since one electron is extra in the polyatomic ion, the ion must have negative charge extra.

Therefore,

total net charge of the ion

= +49 -50

= -1

So, the correct option would be C)

ANSWER:

C) –1

0.0956 grams of helium will occupy a volume of 575 mL at 760 mmHg and 20°C

To calculate the mass of helium that will occupy a given volume at a specific temperature and pressure, we need to use the ideal gas law equation: PV = nRT. Here's how you can solve the problem:

Convert the volume to liters: 575 mL = 575/1000 = 0.575 L.

Convert the pressure to atmospheres: 760 mmHg = 760/760 = 1 atm.

Convert the temperature to Kelvin: 20°C = 20 + 273.15 = 293.15 K.

Plug the values into the ideal gas law equation: (1 atm) * (0.575 L) = n * (0.0821 L·atm/(mol·K)) * (293.15 K).

Rearrange the equation to solve for n (the number of moles): n = (1 atm * 0.575 L) / (0.0821 L·atm/(mol·K) * 293.15 K).

Calculate the value of n: n = 0.0239 moles.

To find the mass, we need to know the molar mass of helium, which is approximately 4 grams per mole.

Multiply the molar mass by the number of moles: 4 g/mol * 0.0239 moles = 0.0956 grams.

Therefore, approximately 0.0956 grams of helium will occupy a volume of 575 mL at 760 mmHg and 20°C.

Note: The ideal gas law assumes ideal gas behavior, and the calculated result may not be accurate under extreme conditions or for gases that deviate significantly from ideal behavior.

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Answer:

18 grams

Explanation:

Mass of solution = 150 g

Percent concentration = 12%

Percent concentration = mass of solute/mass of solution × 100

Let the mass of solute be x

12= x/150 × 100

12= 100x/150

12 × 150 =100x

x= 12 × 150/100

x = 18 g

Answer:

18

Explanation:

Mass of solution = 150 g

Percent concentration = 12%

Percent concentration = mass of solute/mass of solution × 100

Let the mass of solute be x

12= x/150 × 100

12= 100x/150

12 × 150 =100x

x= 12 × 150/100

x = 18 g

To find moles when given the molar mass, you can use the concept of molar mass as a conversion factor.Molar mass represents the mass of one mole of a substance, expressed in grams per mole (g/mol).

To calculate moles, divide the given mass of the substance by its molar mass. The equation is:

moles = mass / molar mass

For example, if you have 56 grams of carbon dioxide (CO2) and want to find the number of moles, you need to know the molar mass of CO2, which is approximately 44 g/mol. Using the equation above:

moles = 56 g / 44 g/mol

moles ≈ 1.27 mol

Therefore, there are approximately 1.27 moles of carbon dioxide in 56 grams.

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Answer:

If there are more products than reactants, that means the reaction has shifted towards the left, which is the backward direction. If there are more reactants than products, that means the reaction has shifted towards the right, which is the forward direction.

Answer:

It is a type of virus and it's chasing after the word. They can kill humans. So it's a really dangerous type of virus. (beware!!! Lots of peoples had died because of Corona Virus!).

55.03 moles of KCI are produced when 6743 grams of \(KClO_{3}\) decomposes

To determine the number of moles of KCl produced when 6743 grams of \(KClO_{3}\) decomposes, we need to use the concept of molar mass and the balanced chemical equation.

First, let's calculate the molar mass of \(KClO_{3}\)

The molar mass of potassium (K) is approximately 39.10 g/mol.

The molar mass of chlorine (Cl) is approximately 35.45 g/mol.

The molar mass of oxygen (O) is approximately 16.00 g/mol.

So, the molar mass of \(KClO_{3}\) is:

(39.10 g/mol) + (35.45 g/mol) + (3 * 16.00 g/mol) = 122.55 g/mol.

Now, we need to calculate the number of moles of \(KClO_{3}\):

Number of moles = Mass / Molar mass

Number of moles = 6743 g / 122.55 g/mol = 55.03 mol.

According to the balanced chemical equation:

2\(KClO_{3}\) -> 2 KCl + 3 O2,

we can see that for every 2 moles of \(KClO_{3}\), we obtain 2 moles of KCl.

Therefore, the number of moles of KCl produced will be equal to the number of moles of \(KClO_{3}\) since the ratio is 1:1. Thus, 55.03 moles of KCl will be produced.

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Physics is a vast field that addresses a wide range of questions about the nature of the physical world. Probing questions can help to explore this field and encourage critical thinking and deep exploration of its topics.

Probing questions are open-ended questions asked to gather information, encourage critical thinking and deep exploration of a particular topic. Physics is a natural science that studies matter and its motion through space-time. It is a branch of science that deals with the fundamental nature of the universe and seeks to explain how and why objects behave as they do in the physical world.The following are some examples of probing questions within the scope of physics:What is the nature of light-The nature of light is an important topic within the scope of physics. It refers to the dual nature of light, as both a wave and a particle. Light behaves as a wave when it is traveling through space and as a particle when it is interacting with matter.How do magnets work-Magnets are a common object in the world around us, and they have a broad range of applications. They work by producing a magnetic field, which can attract or repel other magnetic objects. This topic lies within the scope of physics.What is the relationship between energy and matter-Energy and matter are two fundamental concepts in physics. The relationship between them is described by Einstein's famous equation E=mc2, which states that matter and energy are two forms of the same thing and are interchangeable. The study of the relationship between energy and matter lies within the scope of physics.What is the nature of the universe?The study of the universe's nature is one of the most significant topics within the scope of physics. This question addresses the origins and properties of the universe, its components, and the laws that govern its behavior.

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Ratio of moles of NH₃ produced to moles of N₂ used: 2 moles of NH₃ / 1 mole of N₂

Ratio of moles of NH₃ produced to moles of H₂ used: 2 moles of NH₃ / 3 moles of H₂

From the balanced chemical equation:

N₂ + 3 H₂ ⟶ 2 NH₃

We can determine the ratio of moles of products to the moles of each reactant.

Ratio of moles of NH₃ produced to moles of N₂ used:

From the balanced equation, we can see that 1 mole of N₂ reacts to produce 2 moles of NH₃. Therefore, the ratio is:

2 moles of NH₃ / 1 mole of N₂

Ratio of moles of NH₃ produced to moles of H₂ used:

From the balanced equation, we can see that 3 moles of H₂ react to produce 2 moles of NH₃. Therefore, the ratio is:

2 moles of NH₃ / 3 moles of H₂

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Given the equation of reaction;

N₂ + 3 H₂ ---> 2 NH₃

Calculate the ratio of the moles of produced to the moles of each of the reactants used. (Write two separate ratios.)

Answer:

Let it be x

\({ \tt{ (oxidation \: state \: of \: nitrogen) + 2x = overall \: charge}} \\ { \tt{ - 4 - 2 x = 0}} \\ { \tt{2x = - 4}} \\ { \tt{x = - 2}}\)

To calculate the moles of H+ and OH-, you need to know the concentration of the solution in terms of its pH or pOH value.

When you get the pH of the solution, you can use this formula to calculate the concentration of H+ ions: [H+] = 10^(-pH)

Also, if you know the pOH of the solution, you can use this formula to calculate the concentration of OH- ions: [OH-] = 10^(-pOH)

Having determined the concentration of H+ and OH- ions, the molarity formula can be used to calculate the number of moles of each ion as follows: moles = concentration (in mol/L) x volume (in L)

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CHBr3 is expected to be less soluble in methanol due to its polar nature and more soluble in hexane due to its nonpolar nature, making hexane a more appropriate solvent for CHBr3.

The solubility of a substance in a particular solvent depends on the intermolecular forces between the solute and the solvent molecules, as well as the temperature. In general, polar solvents like methanol (CH3OH) dissolve polar solutes, while nonpolar solvents like hexane (C6H14) dissolve nonpolar solutes.

In this case, CHBr3 (bromoform) is a nonpolar molecule due to the symmetrical distribution of its atoms and the lack of a polar covalent bond. Therefore, it is likely to be more soluble in hexane, which is also a nonpolar solvent, than in methanol, which is a polar solvent.

To further elaborate, the solubility of CHBr3 in methanol is limited because the polar nature of methanol does not allow for the dissolution of nonpolar CHBr3. This is due to the fact that the polar methanol molecules tend to surround and solvate polar solutes, whereas nonpolar solutes like CHBr3 are not effectively solvated in polar solvents.

On the other hand, hexane is a nonpolar solvent, which means that CHBr3 is expected to be more soluble in hexane as the nonpolar nature of both the solvent and solute allows for better solvation and dispersion of the solute molecules. Additionally, hexane has a low polarity index compared to methanol, further enhancing the solubility of CHBr3 in hexane.

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Answer:

C should be the answer

Explanation:

energy required to raise 1 gram of a sample by 1 kelvin or degree celsius

Answer:

C)

one, one

Explanation:

Answer:

The boiling point of n-octanol is 194.8 degree C and the boiling point of n-octane is 125 degrees C. In the case of gum or liquid stationary phase like polysiloxanes, three prime kinds of interactions play an essential role, that is, dipole, dispersion, and hydrogen bonding. Of all these, the prime kind of interaction for all the kinds of polysiloxanes stationary phase is dispersion.  

It is based on the concept that the solute or the analyte, which is more volatile will elute quickly from the column, that is, it is reliant on the concept of volatility, and the volatility is determined based on its boiling point. Of the analytes used, n-octane exhibit less boiling point in comparison to n-octanol. Thus, when the pure polydimethylsiloxane stationary phase is used, one can expect n-octanol to elute at the end, as it is less volatile in comparison to n-octane. Between the n-octanol hydroxyl group and the stationary phase, no intermolecular force takes place.  

On the other hand, when 5 percent phenyl 95 percent polydimethylsiloxane stationary phase is used n-octanol will elute at the end. Due to the presence of 5 percent phenyl, the stationary phase will become more polar in characteristic and will possess the tendency to combine with more polar groups, and as n-octanol is a more polar analyte than n-octane, therefore, it will retain n-octanol for a prolonged time, and thus, will get elute at the end.  

Answer:

Mass = 153.33 Kg

Explanation:

Given:

Force = 2,300 N

Acceleration = 15 m/s²

Find:

Mass

Computation:

Mass = Force / Acceleration

Mass = 2,300 / 15

Mass = 153.33 Kg