Determine the root-mean-square speed of CO2 molecules that have an average kinetic energy of
4.21 × 10–21 J per molecule.

There are 0.916 moles of Zn(NO₃)₂ in 173.50 g of the substance.

To calculate the moles of Zn(NO₃)₂ in 173.50 g of the substance, we need to know the molar mass of Zn(NO₃)₂.

The molar mass of Zn(NO3)2 can be calculated by adding the atomic masses of zinc (Zn), nitrogen (N), and oxygen (O), and then multiplying by the number of atoms of each element in the compound:

Molar mass of Zn(NO₃)₂ = (65.38 g/mol for Zn) + (2 x 14.01 g/mol for N) + (6 x 16.00 g/mol for O)

Molar mass of Zn(NO₃)₂ = 189.39 g/mol

Now we can use the following formula to calculate the moles of Zn(NO₃)₂:

moles = mass / molar mass

moles = 173.50 g / 189.39 g/mol

moles = 0.916 moles

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--The given question is incomplete, the complete question is

"Moles of Zn(NO₃)₂ in 173. 50 g of this substances. Express your answer in moles to four significant figures."--

The volume of the balloon at the new pressure and temperature will be approximately 0.721 L.

This is a problem involving the ideal gas law, which relates the pressure, volume, number of moles, and temperature of a gas:

PV = nRT

where P is pressure, V is volume, n is number of moles, R is  ideal gas constant, and T is temperature in Kelvin.

We can use this equation to solve for the final volume of the balloon at a different pressure and temperature, assuming that the number of moles of gas remains constant.

Firstly, we need to convert temperature to Kelvin:

T₁ = 273.15 + 15 = 288.15 K

T₂ = 273.15 - 50 = 223.15 K

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

V₂ = (nRT₂)/P₂

where P₂ is the new pressure.

To find the new pressure, we can use the ideal gas law equation with the given conditions:

P₁V₁ = nRT₁

Solving for P₁:

P₁ = (nRT₁) / V₁

P₁ = (6.112 mol)(0.0821 L·atm/mol·K)(288.15 K) / (2.29932 L)

P₁ = 16.2 atm

Now we can use the new pressure and temperature to calculate the final volume:

V₂ = (nRT₂)/P₂

V₂ = (6.112 mol)(0.0821 L·atm/mol·K)(223.15 K) / (16.2 atm)

V₂ = 0.721 L

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If you incorrectly measured your starting mass too high, the percent recovery results would be lower than they should be. This is because percent recovery is calculated as the ratio of the actual yield to the theoretical yield, multiplied by 100%.

The actual yield is the amount of product that you actually obtained from the reaction, while the theoretical yield is the amount of product that you would expect to obtain based on stoichiometric calculations.

If you measured your starting mass too high, you would have used more reactant than you should have, resulting in a larger amount of product than you would have obtained if you had used the correct amount of reactant. This means that your actual yield would be higher than it should be, while your theoretical yield would remain the same.

As a result, the ratio of actual to theoretical yield would be lower than it should be, and your percent recovery results would be underestimated.

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A metastable state is a state of the substrate in which the reaction can proceed but typically requires a catalyst. This statement best describes a metastable state. The correct answer is C.

A metastable state is a state of the substrate in which the reaction can proceed but typically requires a catalyst. It is a state of matter that is not in equilibrium but appears to be in equilibrium for a long time, after which it collapses to its most stable state.

Metastability is the quality of a non-equilibrium system to remain in a quasi-stable state for a longer period than predicted by the system's relaxation time.

Here are some characteristics of metastable states: The equilibrium changes in the state but not in the rate. The activation energy difference between a catalyzed and an uncatalyzed reaction makes up the metastable state. The state is made up of transient complexes with the substrate.

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The relationship between pressure and volume of a gas is Inverse, so that as volume decreases, pressure increases. The relationship between pressure and volume of a gas is called the Boyle's Law.

According to this law, at a constant temperature and amount of gas, the pressure and volume of a gas are inversely proportional to each other i.e. PV = K where P is the pressure, V is the volume, and K is a constant. So, as the volume of a gas decreases, the pressure increases, and as the volume of a gas increases, the pressure decreases.

This can be explained by the fact that as the volume decreases, the molecules of gas are compressed into a smaller space, which causes them to collide more frequently with each other and the walls of the container. This increase in collisions results in an increase in pressure. Conversely, as the volume increases, the molecules of gas have more space to move around and collide less frequently, resulting in a decrease in pressure.

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The group highlights the metalloids in the illustration of the periodic table is C.

The C are the metalloids or the semi-metals this means they have the some properties that is similar to the metals and the non-metals. The Metalloids can be defined as the chemical elements whose the physical and the chemical properties fall in the between the metal and the non-metal categories.

The Boron, the germanium, silicon, the antimony, arsenic, the tellurium and the pollanium are the seven that is most widely recognized metalloids. Therefore, the metalloids are highlighted by the group C that is present in the periodic table.

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As a result, the material has a specific heat capacity of 0.20 J/g°C.

Its specific heat capacity is the amount of heat energy required to raise the temperature of a unit mass of any substance or matter by one degree Celsius.

We can use the following formula to find the substance's specific heat capacity: Q = m * c * ΔT

where Q is the extra energy in joules, m is the substance's mass in grammes, c is its specific heat capacity in joules per gramme of temperature, and T is the temperature change in degrees Celsius.

When we substitute the specified values, we obtain:

36.6 J = (6.1 g) * c * (80.0°C - 50.0°C)

Simplifying and solving for c, we get:

c = 36.6 J / (6.1 g * 30.0°C)

c = 0.20 J/g°C

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The limiting reactant of the reaction as shown is AgNO3 because it has less theoretical yield.

The limiting reactant in a chemical reaction is the reactant that gets consumed completely and limits the amount of product that can be formed.

Compare the calculated number of moles of product that can be formed from each reactant. The reactant that produces the smaller number of moles of product is the limiting reactant.

It is important to identify the limiting reactant because it determines the maximum amount of product that can be formed in the reaction.

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Answer:Cutting, tearing, shattering, grinding, and mixing are further types of physical changes because they change the form but not the composition of a material. For example, mixing salt and pepper creates a new substance without changing the chemical makeup of either component.

Explanation:

n(C3H8) = V(P) x (P/T) x (1/mol.mass C3H8)

where V(P) is the volume of propane gas at pressure P and temperature T, and mol.mass C3H8 is the molar mass of propane (44.1 g/mol)

n(C3H8) = 0.650 L x (1 atm/1.01325 bar) x (1/273.15+25) K x (1/44.1 g/mol)

n(C3H8) = 0.0153 mol

Therefore, the amount of oxygen required for complete combustion of propane is:

n(O2) = 5 x n(C3H8)

n(O2) = 5 x 0.0153 mol

n(O2) = 0.0765 mol

To find the volume of oxygen required, we can use the ideal gas law:

PV = nRT

where P is the pressure of the gas, V is the volume of the gas, n is the number of moles of the gas, R is the gas constant, and T is the temperature of the gas in Kelvin.

Rearranging the equation and plugging in the values, we get:

V(O2) = n(O2)RT/P

where R is the gas constant (0.08206 L atm mol^-1 K^-1) and T is the temperature in Kelvin (298 K)

V(O2) = 0.0765 mol x 0.08206 L atm mol^-1 K^-1 x 298 K / 1 atm

V(O2) = 1.86 L

Therefore, 1.86 L of oxygen is required to completely combust 0.650 L of propane.

To find the volume of carbon dioxide produced, we use the same approach:

n(CO2) = 3 x n(C3H8)

n(CO2) = 3 x 0.0153 mol

n(CO2) = 0.0459 mol

V(CO2) = n(CO2)RT/P

where R is the gas constant (0.08206 L atm mol^-1 K^-1) and T is the temperature in Kelvin (298 K)

V(CO2) = 0.0459 mol x 0.08206 L atm mol^-1 K^-1 x 298 K / 1 atm

V(CO2) = 1.08 L

Therefore, 1.08 L of carbon dioxide is produced in the reaction.

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Based on the observation in the warm-up activity, where the temperature of the surrounding water increased during the reaction inside the chamber, it can be inferred that the reaction released heat energy (enthalpy).

This is because the temperature of the surrounding water increased, indicating that energy was transferred from the system (reaction inside the chamber) to the surroundings (water).

According to the first law of thermodynamics, the total energy of a closed system is conserved, meaning that energy cannot be created or destroyed but can only be transferred between the system and the surroundings. In exothermic reactions, energy is released by the system to the surroundings, resulting in an increase in the temperature of the surroundings.

Therefore, the observation of an increase in temperature of the surrounding water suggests that the reaction inside the chamber is exothermic and releases heat energy.

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The neutralization reaction is:

O2H 3PO4 + 3Ba(OH) 2 → 6H 2O+ Ba(PO 4)2

A neutralization reaction is a type of chemical reaction that occurs between an acid and a base, resulting in the formation of a salt and water.

In this reaction, the hydrogen ions (H+) from the acid react with the hydroxide ions (OH-) from the base to form water (H2O), which neutralizes the acidic and basic properties of the reactants. The remaining ions then combine to form a salt.

The general equation for a neutralization reaction is:

Acid + Base → Salt + Water

For this question, the chosen answer is the neutralization reaction  because an acid (H3PO4) and a base (Ba(OH)2) react to form water and a salt (Ba(PO4)2).

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Answer:

(a) At 20 °C the average kinetic energy of the particles is higher than at 60 °C.

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Answer:

dT/dt=2.680K/M

Explanation:

In this case we have:

P=8atm

R=0.0821

dP/dt=0.10 atm/min

V=10L

dV/dt=0.15L

n=10 moles

given that PV=nRT

d(PV)/dt=d(nRT)/dt

P(dV/dt)+V(dP/dt)=nRdT/dT

8*0.15+10*0.10=10*0.0821* dT/dt

dT/dt=2.6796589525

dT/dt=2.680K/m

(If it was not right please let me know)

a. The pressure in the compartment would be 6.7 atm at 45.0°C. b. Converting 6.7 atm to kPa gives 680.6 kPa. This is about 6.7 times greater than standard atmospheric pressure.

Converting 0.050 L to m³ gives 5.0 x 10^-5 m³.

Using the ideal gas law, we can calculate the new pressure to be 4.4 atm.

We can use the Ideal Gas Law to solve this problem, which states:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant (0.0821 L·atm/mol·K), and T is the temperature in Kelvin.

a) We are given the volume V = 0.050 L, the temperature T = 45.0°C = 318.15 K, and the assumption that the compartment holds the same number of moles of N2 as in the previous question, which is n = 0.036 mol. We can rearrange the Ideal Gas Law to solve for P:

P = nRT/V

P = (0.036 mol)(0.0821 L·atm/mol·K)(318.15 K)/(0.050 L)

P = 146.7 atm

b) To convert this pressure to kPa, we can use the conversion factor 1 atm = 101.3 kPa:

P = 146.7 atm x 101.3 kPa/atm

P = 14862 kPa

To describe how many times greater than standard atmospheric pressure this would be, we can divide this pressure by standard atmospheric pressure, which is approximately 101.3 kPa:

14862 kPa / 101.3 kPa = 146.5

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Answer: "C the long-term survival of an entire species of organisms."

Explanation:

A - Yes, reproduction of the species is part of Evolution, it is not the best answer for the question taking into account the other possible answers.

B - Evolution is not necessarily a short-term thing, Evolution occurs over a long period of time.

C - *Refer to the explanation above.*

D - This answer has more to do with Ecosystems, rather than Evolution/Natural Selection.

Option ,1,3 and 4 are correct.

Nitrogen oxides, sulfur dioxide, and carbon monoxide are the gases that cause respiratory illness when exposed over the long run.

These gases/oxides are harmful because of the following reasons-

An oxide is a chemical compound that contains at least one oxygen atom and one other element.It can be either inorganic or organic. Oxides are compounds with a wide range of physical and chemical properties.

Respiratory illness is a broad term used to describe a variety of respiratory system disorders. The respiratory system is made up of the lungs, airways, and muscles that enable you to breathe.Respiratory disorders can be caused by a variety of factors, including genetic, environmental, and lifestyle factors. Asthma, chronic obstructive pulmonary disease (COPD), bronchitis, and emphysema are some examples of respiratory disorders caused by exposure to environmental pollutants.

Carbon dioxide-Carbon dioxide is a colorless, odorless gas that is a byproduct of respiration. Carbon dioxide is a greenhouse gas that contributes to global warming when released into the atmosphere. However, it is not considered to be harmful to human health when exposed in low concentrations.

Sulfur dioxide-Sulfur dioxide is a colorless gas that is produced by the burning of fossil fuels. Sulfur dioxide is a hazardous air pollutant that causes respiratory illnesses such as asthma and bronchitis

Nitrogen oxides-Nitrogen oxides are produced by combustion processes such as the burning of fossil fuels. Nitrogen oxides can cause respiratory illnesses such as asthma and chronic obstructive pulmonary disease (COPD). When nitrogen oxides combine with water vapor, they form acid rain.

Carbon monoxide-Carbon monoxide is a colorless, odorless gas that is produced by the incomplete combustion of fossil fuels. Carbon monoxide poisoning can cause headaches, nausea, dizziness, and even death when exposed in high concentrations. Carbon monoxide is also a contributor to air pollution.

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The polarity of water is a critical property that enables it to dissolve and transport ions, such as sodium and potassium, to the heart cells, which are essential for proper cardiac function.

The property of water that allows it to carry ions to the heart is its polarity. Water is a polar molecule, which means it has a partial negative charge near the oxygen atom and a partial positive charge near the hydrogen atoms. This polarity allows water molecules to interact with and dissolve ionic compounds, such as sodium and potassium ions, which are crucial for the proper functioning of heart cells. In the bloodstream, sodium and potassium ions are transported by the water molecules.

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If the compartment could retain the same quantity of moles of N2 gas as determined in the previous question at a temperature of 45.0°C, the pressure inside would be 28.6 atm.

P = nRT/V

replacing the specified values:

P = 28.6 atm when P = (0.0122 mol)(0.0821 L atm/mol K)(45.0°C + 273) / 0.050 L.

We can use the following conversion factor to change this pressure from kPa to atm:

101.325 kPa per atm

Therefore, the pressure in kPa is 2899 kPa: 28.6 atm x 101.325 kPa/atm

To put it in terms of how much higher than normal atmospheric pressure this would be:

28.6 times (2899 kPa / 101.325 kPa)

As a result, there would be an increase in pressure of 28.6 times inside the container.

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The cage size of the zeolites is in angstroms scale. The size of the cage of zeolites ranges from 2-10 angstroms and that is too small to be measured in centimeters. So, the statement given is false.

Zeolites are defined as the minerals which contain mainly aluminum and silicon compounds. These are used as drying agents in detergents and in water and air purifiers. The zeolites have a cage size which is much more smaller than a nanometer which makes them selective towards certain molecules based on their size and shape.

The properties of zeolites are attributed to their pore structure of the cage. Zeolite is composed of channels and cages which provides a surface area that is accessible to molecules that can be adsorbed.

Zeolite have high surface area of which makes them an effective catalyst for a wide range of reactions which includes the conversion of petroleum feedstocks to gasoline and diesel fuel.

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Answer:

11

Explanation:

mass no.= No. of protons+ no.of neutrons

= 5+6

=11

The correct option is A) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

The assertion is that atomic size decreases across a period and increases down a group of the periodic table.

The assertion is correct because, moving from left to right across a period, the atomic number of elements increases, resulting in an increase in the number of protons in the nucleus, which attract the electrons closer to the nucleus, reducing the atomic size. Additionally, as electrons are added to the same valence shell, there is no significant increase in the shielding effect of inner shells, which further decreases the atomic size.

The reason is also correct because, as we move down a group, the number of electron shells increases, and the atomic size increases because of the increasing distance between the outermost electrons and the nucleus. The electrons in inner shells also provide more shielding, reducing the effective attraction of the nucleus on the outermost electrons, further increasing the atomic size.

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The two specific pollutants in the stormwater runoff are pathogens and the bacteria.

The common types of the pollutants found in the stormwater runoff will include the sediment, nutrients, the pathogens and the bacteria, heavy metals like the copper, zinc, and the lead, trash and the debris, organic matter, and the microorganisms.

As the storm water flows across streets, sidewalks, lawns and golf courses, it can pick up harmful pollutants and push them into storm drains, rivers and streams. The Stormwater runoff is generated from the rain and the snowmelt that will flows over the land or the impervious surfaces, such as the paved streets, parking lots, and the building rooftops, and it does not soak in the ground.

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All bond types in a carboxylic acid have critical extremity, with the exception of the connection between the two carbon iotas in the carboxyl group.

A carboxyl group is a user group that comprises a carbonyl group (C=O) and a hydroxyl group (- Goodness) joined to a similar carbon molecule, which is likewise clung to a third iota or group.

The carbonyl group in the carboxyl group has a critical extremity because of the electronegativity distinction between the oxygen and carbon iotas. The oxygen iota is more electronegative than the carbon particle, and that implies that it draws in the common electrons in the bond all the more firmly, making a halfway regrettable charge on the oxygen and a fractional positive charge on the carbon.

The hydroxyl group in the carboxyl group likewise has a critical extremity, with the oxygen iota being more electronegative than the hydrogen particle, bringing about a fractional negative charge on the oxygen and a halfway certain charge on the hydrogen.

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The number of water molecules in the container when one electron is removed from every hundredth water molecule and placed in a container is 100. m from the water is 3.30 x 1025.

Given,1 liter of water = 1000 g of water1 mole of water molecules = 6.022 x 1023 particles.

Therefore, 55.5 moles of water molecules = 55.5 x 6.022 x 1023 particles = 3.33 x 1025 particles one electron is removed from every hundredth water molecule.

So, 1 electron is removed from 1% of water molecules. Therefore, the number of water molecules from which the electron is removed = (1/100) x 3.33 x 1025 = 3.33 x 1023 molecules.

Now, this electron is placed 100 m away from the water container. The distance between the water container and the electron is not relevant for finding the number of water molecules in the container, hence can be ignored.

So, the number of water molecules in the container = Total number of water molecules - number of water molecules from which electron is removed= 3.33 x 1025 - 3.33 x 1023 = 3.30 x 1025.

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The atomic number of an atom is always equal to the total number of protons in the nucleus. Therefore, the correct answer is "protons in the nucleus".

The atomic number of an atom represents the number of protons present in the nucleus of the atom. Protons are positively charged particles, and they determine the element to which the atom belongs. The number of protons in the nucleus is equal to the number of electrons in the neutral atom, which determines the chemical properties of the element. Neutrons are uncharged particles present in the nucleus, and their number may vary for different isotopes of the same element. Therefore, the atomic number cannot be equal to the total number of neutrons in the nucleus or the total number of protons plus electrons in the atom.

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Answer:

hypotheticcally 8

Explanation:

A solution is made by dissolving 19.8 g of Compound AB in enough water to create a 115.1 ml solution. The solution's density is: 1.14 g/mL.

The formula for the molality of a solution is m = moles of solute/mass of solvent in kilograms.

To begin, we must first convert the solution's density to mass by using the density formula: density = mass/volume

Mass = density x volume

Mass = 1.14 g/mL x 115.1 mL

Mass = 131.214 g

Next, we must convert grams to kilograms for the mass of the solvent in the molality formula by dividing the mass by 1000.

Mass of solvent in kilograms = 131.214 g / 1000

Mass of solvent in kilograms = 0.131214 kg

Finally, we must calculate the moles of solute, which is Compound AB. To do so, we must use the compound's molar mass, which is calculated by adding up the atomic weights of each element present in the compound. We'll use the following calculations to find the molar mass of Compound AB.

Molar mass of Compound AB = 1 mol A + 1 mol B= 35.5 g/mol A + 79.9 g/mol B

Molar mass of Compound AB = 115.4 g/mol

Now that we have the molar mass of Compound AB, we may calculate the number of moles of solute by dividing the mass by the molar mass.

Number of moles of solute = 19.8 g / 115.4 g/mol

Number of moles of solute = 0.1716 mol

Now that we have the moles of solute and the mass of solvent in kilograms, we can plug in our values to the molality formula to obtain the solution's molality.

m = moles of solute/mass of solvent in kilograms

= 0.1716 mol / 0.131214 kgm = 1.306 mol/kg

The molality of the AB solution is 1.306 mol/kg.

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