which of the following options correctly describe the boiling point of a substance? select all that apply. multiple select question. the boiling point is the temperature at which the vapor pressure equals the external pressure. the boiling point is the temperature at which a liquid evaporates to become a gas. a substance with strong intermolecular forces will have a low boiling point. the boiling point of a substance increases as the external pressure increases. boiling occurs when the vapor pressure of the liquid is sufficient for bubbles of vapor to form in the interior of the liquid.

Compared to methane, CO2 causes more problems as a greenhouse gas due to its longer atmospheric lifetime, greater abundance, and presence in both human and natural emissions.

First, CO2 has a much longer atmospheric lifetime compared to methane. CO2 can remain in the atmosphere for centuries to millennia, while methane has a much shorter lifespan of around a decade. This means that once CO2 is released into the atmosphere, it will continue to contribute to the greenhouse effect for a much longer time than methane.

Second, CO2 is much more abundant in the atmosphere than methane. While methane is considered a more potent greenhouse gas on a per molecule basis, CO2 is released in much larger quantities, which makes it the most important contributor to the greenhouse effect. In fact, CO2 makes up around 80% of all greenhouse gas emissions, while methane makes up around 20%.

Finally, CO2 is not only released by human activities, but also through natural processes such as volcanic eruptions and respiration by plants and animals. This means that CO2 levels will continue to rise even if human activities are reduced or eliminated. On the other hand, methane emissions can be significantly reduced by controlling human activities such as livestock production and fossil fuel extraction.

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Answer:

The answer is A

Explanation:

Wavelength is the distnce between the peak or crests in a wave.

The distance from one peak to the next peak is the wavelength. The correct option is A.

A wave is a dynamic disturbance (change from equilibrium) of one or more quantities that propagates.

The distance between identical points in abutting cycles of a waveform signal propagated in space or along a wire is defined as the wavelength.

Thus, the correct option is A.

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Answer:

response I believe

Explanation:

i'm pretty sure it's a response cause it's the animal responding to needing water and being thirsty

hope this helps! :)

Answer:

50km per hour.

Part of the speed, distance, time triangle.

To get speed, just divide distance by time. 150/3=50

The density of the bowling ball is 3.384 g/cm^3. The mass of a substance per unit of volume is its density. Density is most frequently represented by the symbol, however Latin letter D may also be used.

Therefore,

The radius of the bowling ball = 8 cm

Weight of the ball = 2722 g

Volume of the bowling ball = 4 π r^2 = 4 x 3.142 x 8 x 8 = 804.352 cm^3

Density = Mass/Volume

⇒ Density of the ball = 2722/804.352

⇒ Density = 3.384 g/cm^3

Therefore, the density of the bowling ball is 3.384 g/cm^3.

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The density of the bowling ball is 3.384 g/cm^3. The mass of a substance per unit of volume is its density. Density is most frequently represented by the symbol, however Latin letter D may also be used.

A closed surface or object's volume is measured in three dimensions and is expressed mathematically. Cubic measurements of volume include m3, cm3, in3, etc. The term "volume" is sometimes used to refer to "capacity."

A three-dimensional space's occupied volume is measured. It is often numerically quantified using a variety of imperial units or SI-derived units, such as the cubic meter and liter (such as the gallon, quart, and cubic inch). The link between volume and length (cubed) is symbiotic.

It is more common to think of a container's volume as its capacity rather than as the quantity of room it occupies. The amount of fluid (liquid or gas) that the container can hold is defined as its volume, in other words.

Therefore,

The radius of the bowling ball = 8 cm

Weight of the ball = 2722 g

Volume of the bowling ball = 4 π r^2 = 4 x 3.142 x 8 x 8 = 804.352 cm^3

Density = Mass/Volume

⇒ Density of the ball = 2722/804.352

⇒ Density = 3.384 g/cm^3

Therefore, the density of the bowling ball is 3.384 g/cm^3.

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Answer:

Number of Particles Outside Nucleus 48

Number of Particles Inside Nucleus 84

Answer:

Thus, we can say that the element is calcium. This can be clearly understood as ionic compounds have high melting and boiling points in general such as calcium oxide.

Answer:

The element is Calcium I guess.

Explanation:

Cause calcium oxide has high melting point and is soluble in water.

There are 2 paired and 3 unpaired electrons in the Lewis symbol for a phosphorus atom.

Explanation:

Step 1: Determine the number of valence electrons in phosphorus.
Phosphorus has 5 valence electrons as it is in group 15 of the periodic table.

Step 2: Draw the Lewis symbol with the paired and unpaired electrons.

The symbol will have 2 paired electrons (represented as 2 lines) and 3 unpaired electrons (represented as 3 single dots).

So, the correct answer is option b) 2 paired and 3 unpaired electrons.

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Answer: 15.7 L Fe

Explanation:

\((\frac{4.23*10^{23} molecules Fe }{1} )*(\frac{22.4L Fe}{6.023*10^{23}molecules Fe } )= 15.7 L Fe\)

Basic mole conversion

The volume of 4.23 × 10²³  molecules of Fe is equal to 15.734 L.

Avogadro’s number can be represented as the number of entities in one mole of any substance. Generally, these entities can be molecules, electrons, protons, atoms, or ions, depending upon the chemical reaction or reactant and product.

The value of Avogadro’s number is approximately equal to 6.022× 10²³ mol⁻¹. We know that at STP the volume of any gas or substance is equal to 22.4 liters.

Given, the number of molecules of the Fe =  4.23 × 10²³

The volume of the one mole of Fe = 22.4 L

So 6.022 × 10²³ molecules of Fe have mass = 22.4 L

Then 4.23 × 10²³ Fe molecules will have the volume:

= 4.23 × 10²³ ×22.4/6.022× 10²³

= 15.734 L

Therefore, the volume of 4.23 × 10²³  molecules of Fe is 15.734 liters.

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A person with a history of chemical dependency on controlled substances who desires to obtain A License. A license to practice Nursing students may be required to show proof of current sobriety and fitness to practice.

This rule is from the Texas Board of Nursing’s (BON) Administrative Rules. It is stated that any nurse who has a chemical dependency diagnosis or a history of controlled substance abuse must demonstrate the following through "objective, verifiable evidence" of current sobriety and fitness to practice to get a license.

This objective, verifiable evidence could be obtained through AA records, negative drug tests, an assessment by a specialist in addiction, and testimonies from group members, colleagues, and other close friends.

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The relationship between pH, pOH, and the concentration of hydroxide ions in a solution is given by:

pH + pOH = 14

If a solution has a pOH of 7.39, we can find its pH by subtracting the pOH from 14:

pH = 14 - pOH

pH = 14 - 7.39

pH = 6.61

Therefore, the solution has a pH of 6.61.

The pH scale, which describes the connection between pH, pOH, and the quantity of hydroxide ions, is an essential concept in chemistry. A pH of 7 is regarded as neutral, whereas values below 7 are acidic and those over 7 are basic (also called alkaline).

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The empirical formula of the compound C₄H₁₀O₁.

The empirical method of a chemical compound is the simplest entire range ratio of atoms present in a compound. The empirical formula of a compound is the most effective whole variety ratio of atoms of each detail in the compound.

Step 1: decide the masses. Step 2: decide the variety of moles by dividing the grams by means of the atomic mass. Step 3: Divide the wide variety of moles of every detail through the smallest quantity of moles. Step 4: Convert numbers to complete numbers.

                                         divide by smallest

64.9% C /12 = 5.4             5.4/ 13.5  = 4

13.5% / 1 H  = 13.5             13.5 /1.35  = 10

21.6% / 16 O  = 1.35          1.5/1.5 = 1

Empherical formula = C₄H₁₀O₁

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Answer:

Pb(NO

3

)

2

+

2

KI

→

PbI

2

+

2

KNO

3

Explanation:

The rate of change of the concentration of Na₂C₂O4 is -0.0551 M/s.

To determine the rate of change of the concentration of sodium oxalate (Na₂C₂O4), we can use the rate equation:

Rate = (Δ[Na₂C₂O4]) / (Δt)

where Δ[Na₂C₂O4] represents the change in concentration of Na₂C₂O4 and Δt represents the change in time.

In this case, the initial concentration of Na₂C₂O4 is 1.34 M, and after 19.3 seconds, the concentration is 0.276 M.

Substituting the values into the rate equation, we have:

Rate = (0.276 M - 1.34 M) / (19.3 s - 0 s)

Rate = (-1.064 M) / (19.3 s)

Rate = -0.0551 M/s

Therefore, the rate of change of the concentration of Na₂C₂O4 is -0.0551 M/s.

The negative sign indicates that the concentration of Na₂C₂O4 is decreasing over time, as the reactant is being consumed in the reaction.

It's important to note that the rate of a reaction is influenced by various factors, such as the reaction mechanism, temperature, and presence of catalysts. The rate can be determined experimentally by measuring the change in concentration of a reactant or product over a specific time interval.

The given information allows us to calculate the rate of change for the specific reaction involving Na₂C₂O4. However, without additional information about the reaction, it is not possible to determine the exact nature or stoichiometry of the reaction, as well as any other reactants or products involved.

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The solubility of mercury(II) iodide (HgI₂) in pure water is determined by its Ksp value, which is 2.9 x 10⁻²⁹.

In a 3.0 M solution of NaI, assuming (HgI₄)₂₋is the only significant species, the solubility of HgI₂can be calculated using the Ksp and K values.

The solubility of HgI2 in pure water can be calculated using its solubility product constant (Ksp). The Ksp value for HgI₂ is given as 2.9 x 10⁻²⁹. Solubility product constant represents the equilibrium constant for the dissolution of a sparingly soluble salt. By solving the equilibrium expression for HgI₂, we can determine its solubility in pure water.

In a 3.0 M solution of NaI, assuming the formation of (HgI₄)₂₋ is the only significant Hg-containing species, the solubility of HgI2 can be calculated using the Ksp and K values. The K value given for(HgI₄)₂₋ - is 6.8 x 10²⁹. By setting up an equilibrium expression considering the dissociation of HgI₂ into (HgI₄)₂₋  ions, we can determine the solubility of HgI₂in the presence of the NaI solution.

These calculations involve using the principles of equilibrium and the relationship between concentrations of dissolved species and their equilibrium constants. Solubility is defined as the maximum amount of solute that can be dissolved in a given solvent under specific conditions. By applying the relevant equilibrium expressions and values, we can determine the solubility of HgI₂ in each situation.

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Answer:

Pb(C2H3O2)2 + KI ----> PbI2 + KC2H3O2

Explanation:

all the numbers are written as subscripts

Answer:

Explanation:

(a) Answer: Intermolecular forces

The reason for this answer is because the substance (paraffin wax) only changed it's state from solid to liquid and didn't undergo a breakage in it's covalent bond within it's carbon chain which would have produced another substance.

(b) Solid substances are generally more dense than there corresponding liquid substances because the more compact particles are (which occurs in solids), the more dense they become. They are thus more dense than liquids because liquids have there particles loosely packed and well spaced making them less dense than there corresponding solids. Hence, the solid paraffin wax was going to become less dense because it's particles moved from being tightly packed (as solids) to being loosely packed (as liquids). Density refers to mass per volume but can also be described as the level of compactness of a substance. Thus, since liquid is not as compact as solid, it can be said to be less dense than solids.

There are approximately 0.78 grams of hydrogen atoms in 7.0 grams of water.

To determine the number of grams of hydrogen atoms in 7.0 grams of water \((H_2O)\), we need to consider the molar mass of water and the ratio of hydrogen atoms in the formula.

The molar mass of water \((H_2O)\) can be calculated by adding the atomic masses of hydrogen (H) and oxygen (O):

The molar mass of water \((H_2O) = 2 *\) Atomic mass of hydrogen (H) + Atomic mass of oxygen (O)

Using the atomic masses from the periodic table:

The molar mass of water \((H_2O)\) \(= 2 \times 1.01 \, \text{g/mol} + 16.00 \, \text{g/mol} = 18.02 \, \text{g/mol}\]\)

The molar mass of water is 18.02 g/mol.

Next, we can calculate the moles of water in 7.0 grams by dividing the given mass by the molar mass of water:

\(\[\text{Moles of water} = \frac{7.0 \, \text{g}}{18.02 \, \text{g/mol}} \approx 0.388 \, \text{mol}\]\)

Since there are two hydrogen atoms in each molecule of water, the number of moles of hydrogen atoms is twice the number of moles of water:

Moles of hydrogen atoms = 2 * Moles of water \(\approx 2 \times 0.388 \, \text{mol} \approx 0.776 \, \text{mol}\]\)

Finally, to determine the grams of hydrogen atoms, we multiply the moles of hydrogen atoms by the molar mass of hydrogen:

Grams of hydrogen atoms = Moles of hydrogen atoms * Molar mass of hydrogen

Using the atomic mass of hydrogen:

Grams of hydrogen atoms \(\[ = 0.776 \, \text{mol} \times 1.01 \, \text{g/mol} \approx 0.78276 \, \text{g}\]\)

Rounding to the nearest 0.01 grams:

\(\[\text{Grams of hydrogen atoms} \approx 0.78 \, \text{g}\]\)

Therefore, there are approximately 0.78 grams of hydrogen atoms in 7.0 grams of water.

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Genetic disorders that are extremally dehabilitating

Answer:

It's (B). According to the kinetic theory of gases, the higher the temperature, the the faster the gas particles move inside the container, thus increasing the frequency at which they hit the walls thereby increasing the pressure.

The pressure increases due to the frequency of collisions between molecules and the container walls increases.

The kinetic theory of matter states that all matter consists of numerous small particles which are in constant motion, colliding with one another.

When the temperature of a gas is increases within a closed container, the average kinetic energy of the gas increases.

Thus, when the temperature of a gas is increases within a closed container, pressure increases due to the frequency of collisions between molecules and the container walls increases.

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Combustion analysis of fluorene, a polycyclic aromatic hydrocarbon used to make dyes, plastics, and pesticides, produces 11.44 g CO2 and 1.80 g H2O. The empirical formula of fluorene C₆H₄.

CₓHₐ + O2 → CO2 + H2O Since the combustion is complete, so the total mass of the reactants is equal to the total mass of the reactants Therefore, Mass of O2 = (17.9 + 9.14) – 5.9 = 21.14 grams Here, the empirical formula for the hydrocarbon is CₓHₐ. So, now we have to need to determine the number of moles of the O2, CO2, and H2O :- Mole of CO2 = 17.9/44 = 0.4068 Mole of H2O = 9.14/18 = 0.5078 Mole of O2 = 21.14/32 = 0.6606. The empirical formula for the compound containing uranium and fluorine is UF6. Explanation: The empirical formula of a compound represents the lowest whole number ratio of elements in the compound. This ratio is represented by subscripts in the formula. by this information, we can consider that combustion analysis of fluorene, a polycyclic aromatic hydrocarbon used to make dyes, plastics, and pesticides, produces 11.44 g CO2 and 1.80 g H2O. The empirical formula of fluorene C₆H₄.

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An increase in temperature affects the reaction rate by increasing the number of molecules that have sufficient kinetic energy to react. Hence, the correct option is "increasing the number of molecules that have sufficient kinetic energy to react."

Explanation: Temperature is one of the factors that affects the rate of a reaction. Temperature is related to the kinetic energy of the particles present in the reaction. The higher the temperature of the system, the higher the kinetic energy of the molecules, and the faster they move. This causes an increase in the frequency of molecular collisions and hence an increase in the rate of the reaction.

In addition, when the temperature of the system increases, more molecules have enough kinetic energy to overcome the activation energy barrier and react. Hence, the correct option is "increasing the number of molecules that have sufficient kinetic energy to react."

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Answer:

the second one seems right :)

Explanation:

Answer:

I think true

Explanation:

Primary carbon - 7

Secondary carbon -2

Tirtiary carbon - 2

quaternary Carbon - 2

The infrared (IR) spectroscopy is used to identify functional groups within a molecule. The regions corresponds to the fingerprint region for the molecule is the E region.

The structure is the benzene ring bonded to the amine on carbon 1. There is the methyl group on the carbons 2 and 6.   The IR spectrum has several labeled peaks are

A is a broad stretch around the 3300 cm⁻¹,

B is a series of stretches around the 2900 cm⁻¹,

C is around 1800 cm⁻¹ and there are the very small peaks,

D is a large stretch at around the 1600 cm⁻¹ and

E is around 1000 cm⁻¹ in wavenumber.

The IR spectra is called as the fingerprint region, as the absorption pattern is the highly complex but the unique to each organic structure. The finger print region is the E region.

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The wavelength of an electron can be calculated using the formula: wavelength = h / (mass of electron * velocity). Since kinetic energy is equal to the mass of the electron multiplied by the velocity squared, we can also calculate wavelength by using the formula: wavelength = h / sqrt(2mass of electron kinetic energy).

To convert the kinetic energies given in electron volts (eV) to Joules (J), you can use the formula: 1 eV = 1.6 x 10^-19 J

(a) 20.0 eV = 3.2 x 10^-18 J, wavelength = h / sqrt(2mass of electron3.2 x 10^-18 J) = 2.4 x 10^-12 m or 2.4 pm (picometers)

(b) 200 eV = 3.2 x 10^-17 J, wavelength = h / sqrt(2mass of electron3.2 x 10^-17 J) = 2.4 x 10^-11 m or 24 pm

(c) 2.00 keV = 3.2 x 10^-14 J, wavelength = h / sqrt(2mass of electron3.2 x 10^-14 J) = 2.4 x 10^-8 m or 2.4 nm

(d) 20.0 keV = 3.2 x 10^-13 J, wavelength = h / sqrt(2mass of electron3.2 x 10^-13 J) = 2.4 x 10^-7 m or 24 nm

(e) 0.200 MeV = 3.2 x 10^-11 J, wavelength = h / sqrt(2mass of electron3.2 x 10^-11 J) = 2.4 x 10^-5 m or 0.24 nm

(f) 2.00 MeV = 3.2 x 10^-10 J, wavelength = h / sqrt(2mass of electron3.2 x 10^-10 J) = 2.4 x 10^-4 m or 2.4 nm

A lower energy electron will have a longer wavelength, while a higher energy electron will have a shorter wavelength. To study the crystal structure of NaCl, you would need to use a technique such as X-ray diffraction, which typically uses X-rays with energies in the range of a few keV to a few tens of keV. Based on this, 2.00 keV and 20.0 keV energies are most suited for study of the NaCl crystal structure.

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