Which would have the greatest evaporation: pure water or salt water?

Answer:

5.31×10¯²³ g.

Explanation:

Data obtained from the question include:

Molar weight of O2 = 32 g/mol

Mass of 1 oxygen atom =..?

From Avogadro's hypothesis, we understood that 1 mole of any substance contains 6.02×10²³ atoms.

This implies that 1 mole of O2 also contains 6.02×10²³ atoms.

1 mole of O2 = 32 g

The mass of 1 atom of O2 can be obtained as follow:

32 g of O2 contains 6.02×10²³ atoms.

Therefore Xg of O2 will contain 1 atom i.e

Xg of O2 = 32/6.02×10²³

Xg of O2 = 5.31×10¯²³ g

Therefore, the mass of a single oxygen atom is 5.31×10¯²³ g.

The mass of a single oxygen atom is 5.31 x 10⁻²³ grams. Therefore, option D is correct.

The molecular weight of oxygen gas is 32 g/mol. To find the mass of a single oxygen atom, divide the molecular weight by Avogadro's number (6.022 x 10²³ atoms/mol).

Avogadro's number (6.022 x 10²³) represents the number of particles (atoms, molecules, or ions) in one mole of a substance.

To find the mass of a single oxygen atom, divide the molecular weight of oxygen gas by Avogadro's number:

Mass of a single oxygen atom = (32 g/mol) / (6.022 x 10²³ atoms/mol)

Simplifying the expression:

Mass of a single oxygen atom = 5.31 x 10⁻²³ g

Therefore, the mass of a single oxygen atom is 5.31 x 10⁻²³ grams.

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No, the volume of water in a beaker is not an extensive property.

Extensive properties are those that depend on the amount or size of the substance being measured. In other words, they are properties that change with the quantity of the substance. Examples of extensive properties include mass, volume, and total energy.

In the given scenario, the volume of water in the beaker is 50 milliliters. This volume remains the same regardless of the quantity of water present. Whether it's 50 milliliters or 500 milliliters, the volume measurement does not change. Therefore, the volume of water in the beaker is an example of an intensive property.

Intensive properties are independent of the amount or size of the substance. They are characteristics that remain constant regardless of the quantity of the substance. Examples of intensive properties include temperature, density, and color.

It's important to note that the distinction between extensive and intensive properties depends on the specific property being considered. While volume is typically an extensive property for a bulk substance, in the case of a fixed volume of water in a beaker, it becomes an intensive property.

In summary, the volume of water in a beaker is not an extensive property but rather an intensive property because it does not change with the quantity of the substance.

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Answer:

water

Explanation:

beasuse it is a universal component

The density of sample CO₂ gas under the given conditions is calculated to be 2.99 g/L.

The density of a 0.259 mol sample of CH4 gas contained in an 8.00 l flask at room temperature and pressure can be calculated using the ideal gas law equation:

PV = nRT.

Where P is the pressure,

V is the volume,

n is the amount of gas (in moles),

R is the ideal gas constant and T is the temperature.

Plugging in the given values, we get:

\(PV = (0.259\ mol)(0.082057\ L.atm.K^{-1}.mol^{-1}) (273.15\ K)\)

\(P = (0.259\ mol)(0.082057 L.atm.K^{-1}.mol{-1}) (273.15\ K)/ (8.00\ L) = 0.959\ atm.\)

The density of the gas can be found by rearranging the ideal gas law equation to solve for density:

D = m/V.

Where D is the density, m is the mass of the gas and V is the volume.

Plugging in the given values, we get:

D = (0.259 mol)(16.04 g/mol)/ 8.00 L

= 2.99 g/L

Therefore, the density of the 0.259 mol sample of CH4 gas contained in an 8.00 l flask at room temperature and pressure is 2.99 g/L.

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In CH3CH2(CO)H, the leftmost carbon atom has four bonds and is attached to three hydrogen atoms and one carbon atom.

The correct  answer is: d. sp³, sp², sp³.

This carbon atom is sp³ hybridized. The middle carbon atom is attached to two carbon atoms and two hydrogen atoms. It is attached to one carbon atom through a double bond, which means that it is sp² hybridized. The rightmost carbon atom is attached to one carbon atom, one oxygen atom, and one hydrogen atom. It is also attached to the carbonyl carbon through a single bond, which means that it is sp³ hybridized. Therefore, the hybridizations of the carbon atoms in CH3CH2(CO)H, in order from left to right, are sp³, sp², sp³.

The first carbon (CH3) has four single bonds (three to H and one to C), making it sp³ hybridized. The second carbon (CH2) has four single bonds (two to H and one to each C), also making it sp³ hybridized. The third carbon (CO) has a double bond with oxygen and single bonds with two other atoms (C and H), resulting in sp² hybridization.
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Compound with a formula mass of 42. 08 amu i found to be 85. 64% carbon and 14. 36% hydrogen by mass is Molecular formula=C3H6

As with all of these problems, we assume 100 g

of unknown compound.

And thus, we determine the elemental composition by the given percentages.

Moles of carbon = 85.64 g / 12.011 g/mol = 7.13 mol

Moles of hydrogen = 14.36 g / 1.00794 g/mol = 14.25 mol

Clearly, there are 2 moles of hydrogen per mol of carbon. And thus the empirical formula is CH2

And molecular formula = n × (empirical formula)

Thus,

42.08g mol−1 = n× (12.011 +2 ×1.00794)⋅g⋅mol−1

And thus

n = 3 , and molecular formula = C3H6

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Answer:

D

Explanation:

Taking into account the reaction stoichiometry, the mass of ammonia formed is 34 grams.

In first place, the balanced reaction is:

N₂ + 3 H₂ → 2 NH₃

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

In this case, by reaction stoichiometry, a 28.0 g sample of nitrogen gas combines completely with 6.0 g of hydrogen gas. So, the mass of ammonia formed is 34 grams.

In summary, by reaction stoichiometry, the mass of ammonia formed is 34 grams.

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The statements are related to a postulate of the kinetic molecular theory of gases is gas particles are in constant motion and are very far apart compared to their size. Therefore, option B is correct.

According to kinetic molecular theory, gas particles are in constant motion and have perfectly elastic collisions. Both Charles' and Boyle's laws can be explained using kinetic molecular theory. The average kinetic energy of a gas particle collection is only proportional to absolute temperature.

The kinetic-molecular theory is a theory that explains matter states and is based on the idea that matter is made up of tiny particles that are constantly in motion. The theory contributes to the understanding of observable properties and behaviors of solids, liquids, and gases.

Gas particles are in constant motion and are very far apart in comparison to their size, according to a postulate of the kinetic molecular theory of gases.

Thus, option B is correct.

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The name of the organic compound is 2-methyl pentane. The given organic compound is a five-carbon system with a substitution at the C-2 carbon. The naming of an organic compound is done according to the rules given by IUPAC.

The given organic compound has 5 carbon in its main chain. So It has the root word Pent. Since, all the bonds are single bonds, the organic compound is saturated, hence it has the suffix -ane. Hence the unsubstituted straight chain is pentane.

Numbering is done from right to left, because when the numbering is from right to left, the substituted carbon gets C-2, when it is numbered from left to right, the substituted carbon gets C-4. So the numbering is from the right and the substituted carbon is C-2. The substituent is a single carbon system, a methyl substituent. So the organic compound is named 2-methyl pentane .

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The balanced molecular chemical equation for this reaction is as follows:CuSO4 + 2NH4OH → Cu(OH)2 + (NH4)2SO4.

The balanced molecular chemical equation for the reaction in aqueous solution for copper(II) sulfate and ammonium hydroxide is given below:CuSO4 + 2NH4OH → Cu(OH)2 + (NH4)2SO4Copper (II) sulfate reacts with ammonium hydroxide to form copper (II) hydroxide and ammonium sulfate.

When ammonium hydroxide is added to copper (II) sulfate solution, it produces copper (II) hydroxide and ammonium sulfate. The balanced molecular chemical equation for this reaction is as follows:

Copper (II) sulfate + Ammonium hydroxide → Copper (II) hydroxide + Ammonium sulfateCuSO4 + 2NH4OH → Cu(OH)2 + (NH4)2SO4

The reaction is the exchange reaction that occurs when Cu(OH)2 is produced. This reaction is highly exothermic and releases energy in the form of heat.

The copper (II) hydroxide (Cu(OH)2) precipitate is a pale blue solid, while the ammonium sulfate ((NH4)2SO4) remains in the solution.

Therefore, it is a double displacement reaction.It is a double displacement reaction that occurs when copper (II) sulfate and ammonium hydroxide react to form copper (II) hydroxide and ammonium sulfate.

The balanced molecular chemical equation for this reaction is as follows:CuSO4 + 2NH4OH → Cu(OH)2 + (NH4)2SO4.

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Answer: The following should be included in your description

• Zinc is the anode, and copper is the cathode

• The lemon flesh and juice provide the salt bridge and electrolyte solution

• Electrons flow from zinc to copper through the external wires

• Electrolytes flow in the lemon. Positive ions (cations) moved toward copper electrodes (cathodes), and negative ions (anions) move toward zinc electrodes (anodes). These balance the charges building up

• Two cells in series provide more energy output than one. The clock may need more energy than can be supplied by one cell

• Batteries do not need external source of reactants, whereas a fuel cell must be supplied with reactants

Explanation: Edg 2021

Answer:

Radiation

Explanation:

While being beside a campfire, the heat is transmitted by radiation from fire.  

Por definición de enlace iónico, covalente y regla del octeto, la relación existente entre la teoría del octeto de Lewis con los enlaces iónicos y  covalentes es que dichos enlaces se producen con el objetivo de completar la última capa de electrones y adquirir estabilidad.

Por un lado, se produce un enlace iónico entre átomos metálicos y no metálicos, donde los electrones se transfieren completamente de un átomo a otro. Durante este proceso, un átomo pierde electrones y otro los gana, formando iones. Por lo general, el metal cede sus electrones formando un catión al elemento no metálico, que forma un anión.

Por otro lado, el enlace covalente es el enlace químico entre átomos donde los electrones se comparten, formando una molécula. Se establecen enlaces covalentes entre elementos no metálicos. El par de electrones compartidos es común a los dos átomos y los mantiene unidos.

En ambos casos se cumple con la regla del octeto, que establece que los átomos de los elementos se enlazan unos a otros en el intento de completar su capa de valencia con ocho electrones. Es decir que los átomos van a tender a ceder o compartir electrones para completar ocho electrones en la capa de valencia mediante un enlace iónico, covalente o metálico.

En otras palabras, el objetivo es tener la configuración electrónica del gas noble más cercano, teniendo así la última capa de electrones completa y adquiriendo estabilidad.

En resumen, la relación existente entre la teoría del octeto de Lewis con los enlaces iónicos y  covalentes es que dichos enlaces se producen con el objetivo de completar la última capa de electrones y adquirir estabilidad.

Aprende más:

The main reservoirs of the carbon cycle are the atmosphere, oceans, land (including vegetation and soils), and fossil fuels. In these reservoirs, carbon exists in both inorganic and organic forms.

The inorganic carbon cycle involves the exchange of carbon dioxide (CO2) between the atmosphere and oceans through processes like photosynthesis and respiration.

Organic carbon, on the other hand, is found in living organisms, dead organic matter, and soil organic matter. It is cycled through processes such as decomposition and consumption by organisms. The interactions between the inorganic and organic carbon cycles occur primarily in the biosphere, where photosynthesis converts inorganic carbon into organic carbon compounds. While inorganic carbon is primarily in the form of CO2, organic carbon is present in complex organic molecules. Both forms of carbon play crucial roles in energy transfer, nutrient cycling, and climate regulation.

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All of th Earth's water reservoirs connected to the ocean by the processes of evaporation and precipitation.

Evaporation and precipitation processes link the ocean to all of the earth's water reservoirs, making it a crucial component of the water cycle.

Due to the fact that all significant watersheds on Earth drain to the ocean, the ocean is linked to significant lakes, watersheds, and streams. From watersheds to estuaries and the ocean, rivers and streams carry nutrients, salts, sediments, and pollutants.

Evaporation refers to the process in which liquid is converted into gaseous state or vapours. Precipitation is the process in which gaseous vapours are turned into liquid state and are shed down on the Earth.

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You feel heat from a campfire: Radiation

A mug filled with a hot beverage warms your hands: Conduction

A heat lamp keeps baby chicks warm: Radiation

Warm water moves from the bottom of a pot to the top: Convection

Thunderclouds form in the atmosphere: Convection

A snowball melts in your hands: Conduction

A hot dog cooks over a campfire: Conduction

A cool breeze blows onto the beach on a hot day: Convection

The Sun causes snow to sublimate on a clear winter day: Radiation

A spoon placed in a cup of hot tea becomes hot to the touch: Conduction

Heat can be transferred through three different methods: conduction, convection, and radiation. Conduction is the transfer of heat through direct contact between two objects. Convection is the transfer of heat by the movement of a fluid, such as air or water. Radiation is the transfer of heat through electromagnetic waves.

In the given situations, the heat transfer by radiation occurs from the campfire, heat lamp, and sun. Conduction occurs when you feel the warmth of a hot beverage or the hot dog cooking over the campfire. Convection occurs in the atmosphere, where warm air rises, and cool air falls, leading to thundercloud formation, or when warm water moves from the bottom of a pot to the top.

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Accuracy refers to how close the measurements that are made are to the real value.

The term accuracy refers to how close the measurements that are made are to the real value. The precision refers to how close the measurements are to each other in value. But precision and accuracy play a role in deciding whether or not a measurement is accurate.

Looking at the table;

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Answer:

Didn't know the answer, sorry.

The self-diffusivity (D) of copper can be calculated by using the given data and the equation c(x, t) = (x²/4Dt) * (√(R/D) - 1).

The equation c(x, t) = (x²/4Dt) * (√(R/D) - 1) relates the concentration of the radioactive isotope of copper (c) at a distance (x) from the end of the bar to the self-diffusivity (D) of copper and the annealing time (t).

I₁ = It counts/(min m²)

= 500 counts/(min m²)

I₂ = 500 counts/(min m²)

x₁ = mm

x₂ = 400 mm

t = 10 hours

= 600 minutes

We can use the given equation with the measured counts (I₁ and I₂) to calculate the ratio R/D.

R/D = (I₂/I₁)²

Substituting the values:

R/D = (500/500)²

= 1

We may now rearrange the equation to find D:

D = (x²/4ct) * (√(R/D) - 1)

Substituting the known values:

D = (x₁²/4ct) * (√(1/D) - 1)

= (x₁²/4ct) * (√(1/D) - 1)

Substituting the given values:

x₁ = mm

= 0.001 m

t = 10 hours

= 600 minutes

D = (0.001²/4 * 0.001 * 600) * (√(1/D) - 1)

= 1.6667 * (√(1/D) - 1)

To determine the value of D, we can numerically solve this equation. By substituting different values for D and iterating until the equation is satisfied, we can determine the self-diffusivity of copper.

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Answer:

9400 Grams to Kilograms

To change the mass we use formula [kg] = [9400] / 1000

Answer:

it is an endothermic reaction

Explanation:

This is because there is a rise in temperature from 20 to 46. this means that the reaction takes in heat from the suuroundings

Answer:

D or A your choice

Explanation:

uhhh didnt u- nvm

A neutralization reaction is when an acid and a base react to form water and a salt and involves the combination of H+ ions and OH- ions to generate wate

Answer:

Reproducible by other scientists

The personal opinion of the scientist

Using vanable conditions for each test

Explanation:

The energy needed to remove an electron from an atom is called the ionization energy.

Ionization energy refers to the minimum amount of energy required to completely remove an electron from an atom or a positively charged ion in its ground state, resulting in the formation of a positively charged ion or cation.

Ionization energy is a fundamental property of atoms and is typically measured in electron volts (eV) or kilojoules per mole (kJ/mol). The value of ionization energy depends on several factors, including the atomic structure, electron configuration, and the attraction between the nucleus and the electrons.

Ionization energy plays a crucial role in understanding chemical reactions, as it determines the ease with which an atom or ion can gain or lose electrons. Elements with low ionization energies are more likely to lose electrons and form cations, while those with high ionization energies tend to gain electrons and form anions. Ionization energy also provides insights into an element's reactivity, as it influences the stability and bonding characteristics of atoms and ions in chemical compounds.

Ionization energy is a significant concept in the study of atomic and molecular properties, helping us understand the behavior of atoms and their interactions in various chemical processes.

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Answer:

933/100

9.33m

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