What is atomic models?

Answer:

Ionization

Explanation:

Ionization is the physical process of converting an atom or molecule into an ion by adding or removing charged particles such as electrons or other ions.

The answer is DMSO > Acetone > CCl₄ .

An indicator of a substance or material's capacity to store electrical energy is its dielectric constant. It is a measurement of how much an object can hold or concentrate an electric flux.

Dielectric constant is defined mathematically as the ratio of a material's permittivity to the permittivity of free space. It also goes by the name relative permittivity for this reason. It is relative magnetic permeability's electrical equivalent.

here, the dielectric constant of Acetone is 20.7  , CCl₄ ( Carbon tetrachloride) is 2.23 and DMSO ( Dimethyle Sodium Oxide ) is 46.68.  

So, the trend in dielectric constant for Acetone, CCl₄ and DMSO is,

DMSO ( 46.68 ) > Acetone ( 20.7 ) > CCl₄ ( 2.23 ) .

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Answer:

Nuclear scientists continue to expand the periodic table as they detect new elements. ... Scientists create heavy elements by bombarding two lighter elements that together add up to the mass of the desired new element. One of the elements is stationary and thus called the target.

Answer:

either h or j

Explanation:

Phospholipids are amphipathic molecules, meaning they have both hydrophobic and hydrophilic regions. In an aqueous environment like water, phospholipids arrange themselves into a bilayer structure, with the hydrophobic tails oriented inward and the hydrophilic heads facing outward towards the water.

In a hydrophobic substance like methane, phospholipids would not form a bilayer structure because there would be no polar environment for the hydrophilic heads to interact with. Instead, phospholipids would likely aggregate or create different structures to minimize their exposure to the hydrophobic environment.

Forming a bilayer structure is crucial for the function of cell membranes, as it provides a selectively permeable barrier. In a hydrophobic substance like methane, the absence of a bilayer structure would result in increased membrane permeability. The hydrophobic substance could penetrate and disrupt the lipid structure more efficiently, compromising the membrane's ability to regulate the passage of ions, molecules, and other substances.

Therefore, the absence of a polar environment like water would affect the formation of the phospholipid bilayer.

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Sun-Bleached hair.

You can't exactly pass down piano skills, they have to be taught and also you can't just be born with strong muscles, they also have to develop over time. Height can't exactly be passed down because some parents are tall and their kids come out short. That leaves the only other option to be Sun-Bleached Hair (hair color).

Hope this helps and have a nice day.

-R3TR0 Z3R0

Answer:

False

Explanation:

Biotic factors are those parts of the environment that are living such as humans, bacteria, fungi and protists.

Abiotic factors are those parts of the environment that are non-living.

Answer:

Global winds are the main belts of wind that move in a particular direction across the earth

Answer:

Global winds are the main belts of wind that move in particular directions across the Earth.

Explanation:

All wind is caused by the uneven heating of Earth's surface, which sets convection currents in motion. Convection currents on a large scale cause global winds; convection currents on a small scale cause local winds.

hope that helps love!

Answer:

0.04

Explanation:

The amount of open space between particles when compared to the total possible volume of the particles is called its porosity. Porosity is a term used to describe the amount of open space or voids in a substance.

The open space or void can be filled with air or water, and it determines how much fluid the substance can hold.

Porosity is calculated as the ratio of the volume of open space to the total volume of the substance, usually expressed as a percentage or decimal fraction.

A high porosity means that the substance has a lot of open space or void, while a low porosity means that there is less open space or void between particles.

Porosity is an important measurement used in various fields, including petroleum, geology, and engineering, to determine how efficient a substance is in holding fluid.

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Answer:

the third option

Explanation:

after you choose that answer don't check if it's correct

◑﹏◐

1. Al₂O₃ is ionic.

2. SnO₂ is molecular.

3. CO₂ is molecular.

4. H₂O is molecular.

5. Fe₂O₃ is ionic.

6. Li₂O is ionic

The following oxides is ionic or molecular:

1. Al₂O₃ (aluminum oxide) is ionic because it is formed by a metal (Al) and a non-metal (O).

2. SnO₂ (tin oxide) is molecular, as it consists of a metal (Sn) and a non-metal (O).

3. CO₂ (carbon dioxide) is molecular since it is composed of two non-metals (C and O).

4. H₂O (water) is molecular as it is formed by two non-metals (H and O).

5. Fe₂O₃ (iron oxide) is ionic because it contains a metal (Fe) and a non-metal (O).

6. Li₂O (lithium oxide) is ionic as it is composed of a metal (Li) and a non-metal (O).

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The change in mass of the sucrose membrane bag, compared to that of the glucose membrane bag, can be determined by considering the molar masses of glucose and sucrose. The molar mass of glucose is 180 g/mol, while the molar mass of sucrose is 342 g/mol.

Assuming that both membrane bags contain an equal number of moles, the glucose membrane bag will have a smaller mass change compared to the sucrose membrane bag. This is because the molar mass of glucose is smaller than that of sucrose. However, the specific mass change values cannot be determined without additional information such as the initial and final masses of the bags.

It is also worth noting that the permeability of the membrane and the conditions of the experiment may also affect the observed mass changes.

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Answer: Kosher salt is made up of mainly sodium chloride, often without any other minerals (like iodine) while on the contrary, ionized salt is strengthened with iodine. Another reason would be that kosher salt is natural while iodized isn’t.

Explanation:

The molecular formula of a compound is a whole number multiple of its empirical formula. The empirical formula of the hydrocarbon is C₄H₉.

The empirical formula of a compound can be defined as the formula which gives the simplest whole number ratio of atoms of various elements present in one molecule of the compound.

Here moles of 'C' = moles 'CO₂' = 6.16 / 44 = 0.14 moles

Moles of 'H' = 2 × moles 'H₂O' = 2 × 2.84/18.02 = 0.315 moles

Divide both number of moles by 0.14. Then we get

1 mol 'C' and 2.25 mol 'H'

Multiply both with 4 to obtain a whole number.

Then the number of carbon is 4 and that of hydrogen is 9.

Thus the empirical formula is C₄H₉.

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Answer: The second reaction took place at a higher temperature

Explanation:

Rate is affected by temperature, as higher temperatures cause the reacting molecules to have more energy.

Collision theory states that in order for a reaction to occur, each reacting molecule must collide with one another in the correct orientation and with enough energy, called the activation energy.

A higher energy caused by a higher temperature will cause the molecules to collide much more frequently, leading to a higher chance of a successful collision, and with more energy to satisfy the activation energy.

Therefore, the second reaction must have taken place at a higher temperature, since the molecules had more energy than the first reaction leading to a higher rate of reaction, and a higher rate constant.

A popular science project and craft used to better understand how particular atoms function is the creation of 3D atom models. When teaching about atoms, a 3D atom model can be used to demonstrate concepts in a classroom or to provide explanations.

The 3D concept of the atom and how the protons and neutrons in the nucleus relate geometrically and in terms of size to the electrons spaced at relatively great distances from the nucleus can be introduced to students from elementary school through high school through an atom model project.

It should be noted that in order to make the 3D concept for the model, attach eight small craft balls to the medium circle, eight to the large circle, eight to the extra-large circle, and finally two to the small circle with glue. These will resemble each and every atom's electron. To help the model hang, attach a piece of string to the outer circle.

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The boiling point will be lower, because water boils when its vapor pressure is equal to atmospheric pressure.

Atmospheric pressure is described as the force exerted on a surface by the air above it as gravity pulls it to Earth. Atmospheric pressure is commonly measured with a barometer.

If you are at 8 000 m above sea level, the air pressure is lower than one atmosphere and the equilibrium between the water and air pressures will be reached before.

In conclusion, Atmospheric pressure is caused by the weight of the air molecules above.

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The boiling point of water at 8000m above sea level where air pressure is lower would be significantly lower.

The boiling point of water decreases as the air pressure decreases. At an altitude of 8000 meters above sea level, the air pressure is significantly lower than it is at sea level, so the boiling point of water would also be significantly lower.

At sea level, the normal boiling point of water is 100 degrees Celsius (212 degrees Fahrenheit) at a standard atmospheric pressure of 101.3 kPa. As the altitude increases, the atmospheric pressure decreases, so the boiling point of water decreases as well.

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Answer:

option a and c both are correct

Explanation:

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The pairs of compounds have the same empirical formula are:

a. acetylene, C₂H₂, and benzene, C₆H₆ and

c .nitrogen dioxide, NO₂, and di nitrogen tetroxide, N₂O₄

The empirical formula of a compound is defined as the formula that shows the ratio of elements present in the compound, but not the actual numbers of atoms found in the molecule.

In some cases, the empirical formula is the same as the molecular formula, which gives the actual number of atoms in a compound (e.g., H₂O).Otherwise, the molecular formula is a multiple of the empirical formula (e.g., CH₂O is the empirical formula for glucose, C₆H₁₂O₆).

Examples of empirical formulas:

Glucose has a molecular formula of C₆H₁₂O₆. It contains 2 moles of hydrogen for every mole of carbon and oxygen. The empirical formula for glucose is CH₂O.

The molecular formula of ribose is C₅H₁₀O₅, which can be reduced to the empirical formula CH₂O.

The pair with empirical formula is  acetylene, C₂H₂, and benzene, C₆H₆ and

nitrogen dioxide, NO₂, and di nitrogen tetroxide, N₂O₄

Thus, option (A) and (C) are correct.

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Independent Variable IV is atmospheric temperature, Dependent Variable (DV) are 70°,80°, and 90° , Control Group are  researchers and Constants are humidity and temperature.

Atmospheric temperature is a measurement of temperature at different and various levels of the Earth's atmosphere and above it.

It is effected by many factors, including incoming solar rays, and the humidity and how far from the sea level.

Therefore, Independent Variable IV is atmospheric temperature, Dependent Variable (DV) are 70°,80°, and 90° , Control Group are  researchers and Constants are humidity and temperature.

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The statements that describe the changes that occur when an ionic solid dissolves in water are an ionic solid is converted into ions when it dissolves in water and the ions of an ionic solid are hydrated by water molecules.

When an ionic solid dissolves in water, the ionic solid dissociates into its constituent ions. The positive ions are attracted to the negative pole of the water molecule while the negative ions are attracted to the positive pole of the water molecule. Consequently, the individual ions are surrounded by water molecules, forming a hydration sphere.

The following statements are correct regarding the changes that occur when an ionic solid dissolves in water:

1. An ionic solid is converted into ions when it dissolves in water.

2. The ions of an ionic solid are hydrated by water molecules.

3. Dissolution is an exothermic process that releases energy.

4. The solubility of an ionic solid in water is dependent on temperature and pressure.

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A solution of Na2MgEDTA may be added to the analyte without affecting the amount of EDTA needed to complex calcium ions.

Because the Na2MgEDTA will be complex with other metal ions present in the solution, leaving the EDTA free to complex with the calcium ion. This means that the EDTA will not be consumed by other metal ions and will still be available to complex with the calcium ion, allowing for accurate determination of the amount of calcium present in the solution. Calcium ions (Ca²⁺) are important in many biological processes, as well as in industry and everyday life. In biological systems, calcium ions play a crucial role in muscle contraction, nerve function, and bone and teeth formation. They also serve as second messengers, signaling molecules that regulate various cellular processes. In industry, calcium ions are used in the production of cement, paper, and textiles, among other things. Calcium is also an essential nutrient for humans and is required for proper growth and development. However, excess calcium can lead to health problems such as kidney stones and calcification of soft tissues. Overall, calcium ions are a critical component of many different systems and processes and play a vital role in both biology and industry.

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Answer:

Therefore, 1.00 mole of the gas is present in the container.

Explanation:

The following data were obtained from the question:

Volume (V) = 22.41L

Temperature (T) = 273K

Pressure (P) = 101.325 kPa

Gas constant (R) = 8.31 L.kPa/mol.K.

Number of mole (n) =...?

The number of mole of the gas in the container can obtained by applying the ideal gas equation as illustrated below:

PV = nRT

Divide both side by RT

n = PV /RT

n =101.325  x 22.41 / 8.31 x 273

n = 1.00 mole.

Therefore, 1.00 mole of the gas is present in the container.

Answer:

1 mole of gas is contained in 22.41 liters at 101.325 kPa and 0ᴼC

Explanation:

Ideal gases are a simplification of real gases that is done to study them more easily. It is considered to be formed by point particles, do not interact with each other and move randomly. It is also considered that the molecules of an ideal gas, in themselves, do not occupy any volume.

The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:  

P*V = n*R*T

where P is the gas pressure, V is the volume that occupies, T is its temperature, R is the ideal gas constant, and n is the number of moles of the gas.

In this case:

Replacing:

1 atm*22.41 L=n* 0.082 \(\frac{atm*L}{mol*K}\)*273 K

Solving:

\(n=\frac{1 atm*22.41 L}{0.082\frac{atm*L}{mol*K} *273 K}\)

n=1  mole

1 mole of gas is contained in 22.41 liters at 101.325 kPa and 0ᴼC

Answer:

2.38x10²³ atoms oxygen

Explanation:

To solve this question we need to convert the mass of sand to moles using its molar mass (Molar mass SiO₂ = 60.08g/mol). Twice these moles are the moles of Oxygen and using Avogadro's number we can find the amount of atoms of Oxygen in the mixture:

Moles SiO₂:

11.87g * (1mol / 60.08g) = 0.1976moles SiO₂

Moles Oxygen:

0.1976moles SiO₂* 2 = 0.3951moles oxygen

Atoms oxygen:

0.3951moles oxygen * (6.022x10²³atoms / 1mol O₂) =

The overall enthalpy of the reaction is -131.3 kJ.

To calculate the overall enthalpy of the reaction, you need to manipulate the given equations and combine them in a way that cancels out the common substances. Let's analyze each equation:

1: C (s) + O₂ (g) -> CO₂ (g)   ΔH₁ = -393.5 kJ

2: 2CO (g) + O₂ (g) -> 2CO₂ (g)   ΔH₂ = -566.0 kJ

3: 2H₂O (g) -> 2H₂ (g) + O₂ (g)   ΔH₃ = 483.6 kJ

To obtain the overall reaction: C (s) + H₂O (g) -> CO (g) + H₂(g), we can manipulate the equations as follows:

1: Reverse equation 1 to obtain: CO₂ (g) -> C (s) + O₂ (g)   ΔH₁' = +393.5 kJ

2: Halve equation 2 to obtain: CO (g) + 1/2 O₂ (g) -> CO₂ (g)   ΔH₂' = -283.0 kJ

3: Reverse and halve equation 3 to obtain: H₂ (g) + 1/2 O₂ (g) -> H₂O (g)   ΔH₃' = -241.8 kJ

Now, we can sum up the manipulated equations to obtain the overall reaction:

CO₂ (g) + CO (g) + H₂ (g) + 1/2 O₂ (g) -> C (s) + 2CO₂ (g) + H₂O (g) + 1/2 O₂ (g)

To calculate the overall enthalpy change (ΔHrxn), we sum up the enthalpy changes of the manipulated equations:

ΔHrxn = ΔH₁' + ΔH₂' + ΔH₃'

      = 393.5 kJ + (-283.0 kJ) + (-241.8 kJ)

      = -131.3 kJ

Therefore, the overall enthalpy of the reaction is -131.3 kJ.

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True. Volatile solvents that act as CNS depressants, such as inhalants, can be found in a wide variety of household products.

Volatile solvents are chemicals that vaporize at room temperature and can be inhaled to produce intoxicating effects. These solvents are commonly found in various household products, including cleaning agents, paint thinners, adhesives, aerosol sprays, and certain fuels. Examples of volatile solvents include toluene, xylene, benzene, and trichloroethylene.

When these volatile solvents are inhaled, they enter the bloodstream through the lungs and quickly reach the central nervous system (CNS). In the CNS, they act as depressants, slowing down the activity of the brain and nerve cells. The effects can include dizziness, disorientation, euphoria, hallucinations, and in severe cases, loss of consciousness or even death.

It is important to note that inhalant abuse, particularly among adolescents and young adults, poses serious health risks and can lead to addiction, organ damage, cognitive impairment, and other long-term consequences. Proper usage and storage of household products containing volatile solvents are crucial to prevent unintended inhalation and protect individuals from the harmful effects associated with their misuse.

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Answer:

C - raising the temperature of a gas

Explanation:

as you raise temperature, kinetic energy rises, and so does pressure

Answer:

C.

raising the temperature of the gas

Explanation:

Edg. 2020

Other guy is right i got 100%