Which pair of solvents would make good extraction systems?
diethyl ether and dichloromethane
acetone and diethyl ether
water and diethyl ether
water and ethanol
water and dichloromethane

Answer:

2.24dm³

Explanation:

Given parameters:

Mass of He = 40g

Unknown:

Volume of Helium  = ?

Solution:

To solve this problem, we convert the given mass to number of moles.

   Number of moles  = \(\frac{mass}{molar mass}\)  

   molar mass of He  = 4g/mol

  Number of moles  = \(\frac{4}{40}\)   = 0.1mole

So;

                  1 mole of gas at rtp occupies a volume of 22.4dm³

                0.1 mole of He will occupy a volume of 0.1 x 22.4 = 2.24dm³

The type of solvent used with a marker can greatly affect the reaction and outcome of the marker. When selecting a solvent, it is important to consider the polar or non-polar nature of both the solvent and the marker in order to achieve the desired result.

Solvents are liquids that are used to dissolve substances and are an important aspect of chemical reactions and processes. When it comes to markers, the type of solvent used can greatly affect the reaction and outcome of the marker.

In general, solvents can be classified as polar or non-polar. Polar solvents, such as water, have a positive and negative end, while non-polar solvents, such as oil, have a more uniform distribution of electrons. The solubility of a substance is determined by its polar or non-polar nature and the polar or non-polar nature of the solvent.

Markers contain various types of dyes or pigments that can be either polar or non-polar. When a polar solvent, such as water, is used with a polar marker, the marker will dissolve easily, leading to a more intense and uniform color. On the other hand, when a non-polar solvent, such as alcohol, is used with a polar marker, the marker may not dissolve as well and the color may be lighter or less intense.

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Answer:

C, hexanal

Explanation:

Option C is correct. The given name of the aldehyde CH3CH2CH2CH2CH2CHO is Hexanal

Aldehydes are organic compounds formed from the oxidation of alcohols. The contains the group -CHO

Given the compound CH3CH2CH2CH2CH2CHO

For us to name this compound, we need to first know:

Since there are 6 carbons in the chain, hence the alkane equivalent will be hexane.

Since it is an aldehyde compound.

General naming = alkane name + group name of aldehyde

compound name = alkane name + (-nal)

compound name = hexanal

Hence the name of the given aldehyde is Hexanal

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The change in boiling point of the solution rom the solvent is 3.545 °C. Then the boiling point of the solution is 83.62 °C.

Boiling point of a solution is the temperature at which it converts into its vapor state. The addition of a non-volatile solute leads to the elevation in boiling point of the solution.

The change in boiling point ΔT is related to the molality of the solution and molal elevation constant Kb of the solvent as follows:

ΔT  = Kb m

Given that molality = 1.33 m

Kb of benzene = 2.65 °c/m

then ΔT = 2.65 °c/m × 1.33 m = 3.524 °C

Boiling point of pure benzene = 80.1 °C

Then boiling point of the solution  = 80.1 + 3.524 = 83.62 °C

Therefore, the boiling point of the given solution is  83.62 °C.

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Your question is incomplete. But your complete question is as follows:

What is the boiling point, in °C, of a 1.33 m solution of C6H14 in benzene? Bp (benzene) = 80.1 °c Kb (benzene) =2.65 °c/m

The formula of this cobalt oxide is CoO₂, and the reduction equation is  CoO₂ => Co + 4e⁻.

Reduction is the chemical manner wherein a species profits electrons or loses oxygen. this is in particular used for extracting irons from ores. Ans: discount is located in our activity, and respiration is one instance. Reduction is a day-to-day discount as it refers to the day-to-day addition of electrons, which results in a reduction in the oxidation number daily.

calculation:-

mass of cobalt oxide CoO = 0.83

after reducing to cobalt metal, mass =  0.59g.

mass of oxygen = 0.24

The formula of this oxide = CoO₂

An equation for the reduction of this oxide.

CoO₂ => Co + 4e⁻

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Answer:

six

Explanation:

Valence electrons are the electrons in the outermost shell, or energy level, of an atom. For example, oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell.

Answer:

Six!

Explanation:

Valence electrons are the electrons in the outermost shell of an atom.

Answer:

118 elements in the periotic table

Explanation:

:)

The main aquaporin found in the body is a) aquaporin 1. Aquaporin 1 is widely distributed throughout the body and plays a crucial role in water transport across cell membranes.

Aquaporin 1 is found in red blood cells, the kidneys, and the lungs, where it helps transport water and other small molecules. Aquaporin 2 is primarily found in the kidneys and plays a critical role in regulating water balance and urine concentration.

Aquaporin 3 is found in the kidneys, the digestive tract, and the skin, where it helps regulate water transport and maintain hydration.

Finally, aquaporin 4 is primarily found in the brain and spinal cord, where it helps regulate the flow of cerebrospinal fluid.

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The balanced chemical equation for the reaction of hydrogen gas and oxygen gas to form water is:

2 H2(g) + O2(g) → 2 H2O(g)

According to the stoichiometry of the reaction, 2 moles of hydrogen react with 1 mole of oxygen to form 2 moles of water.

To determine the limiting reactant, we can compare the amount of each reactant to the stoichiometric ratio. Since we have 5.00 mol of both hydrogen and oxygen, we can calculate the moles of water produced from each reactant:

Hydrogen: 5.00 mol H2 × (2 mol H2O / 2 mol H2) = 5.00 mol H2O

Oxygen: 5.00 mol O2 × (2 mol H2O / 1 mol O2) = 10.00 mol H2O

From the calculations above, we can see that oxygen is the limiting reactant because it produces less moles of water than hydrogen. Therefore, the number of moles of steam produced is 10.00 moles (2 × 5.00 moles of water).

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Based on the given information, the beaker contains octane liquid and is sealed inside a tank filled with octane gas at a high temperature of 115 degrees Celsius and a pressure of 544 torr.

At this temperature and pressure, octane has a high vapor pressure, which means that some of the liquid octane in the beaker will evaporate and form octane gas.

As the gas molecules collide with the surface of the liquid, some of them will condense back into liquid phase, resulting in an equilibrium between the liquid and gas phases.

Since the system is sealed, the total amount of octane (in both liquid and gas phases) will remain constant. However, the amount of liquid octane in the beaker will decrease over time due to evaporation, while the amount of octane gas in the tank will increase.

Therefore, after ten minutes, there will be less liquid octane in the beaker than initially present, but the total amount of octane (in both liquid and gas phases) will remain constant.

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Answer:

\(c=3.71\ J/g^{\circ} C\)

Explanation:

Given that,

Mass of sample, m = 996.9 g

The change in temperature of the sample, \(\Delta T=-70.98^{\circ}C\)

Heat produced, Q = 62.9  calories = 263173.6 J

The heat released by a sample due to change in temperature is given by :

\(Q=mc\Delta T\)

Where

c is the specific heat capacity

So,

\(c=\dfrac{Q}{m\Delta T}\\\\c=\dfrac{263173.6}{996.9\times 70.98}\\\\c=3.71\ J/g^{\circ} C\)

So, the specific heat of ethanol is equal to \(3.71\ J/g^{\circ} C\).

To test whether the population mean times for mixing a batch of material differ for the three manufacturers, we can use the given data. The null hypothesis (H0) states that the population mean times are equal, while the alternative hypothesis (H1) suggests that they are not equal.

Null Hypothesis (H0): The population mean times for mixing a batch of material are equal for all three manufacturers. μ1 = μ2 = μ3

Alternative Hypothesis (H1): The population mean times for mixing a batch of material differ among the three manufacturers. At least one pair of means is not equal.

To conduct the hypothesis test, we need to calculate the test statistic and the p-value. The specific values for the test statistic and p-value are not provided in the question, so we cannot perform the calculations or draw a conclusion based on the given information.

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Metallic elements exist in a solid-state and they are opaque, have a shiny surface, good conductors of electricity and heat, malleable and ductile, and are dense. The structure of metals is formed by atoms that are held together by metallic bonds. These atoms have loosely bound valence electrons that can be shared between the neighboring atoms.

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The pH of rainwater at 25°C in which atmospheric CO₂ has dissolved, producing an initial [H₂CO₃] of 1.39 x 10⁻⁵ M, is approximately 5.61.

Carbon dioxide (CO₂) dissolved in rainwater can react with water to form carbonic acid (H₂CO₃);

CO₂(g) + H₂O(l) ⇌ H₂CO₃(aq)

The equilibrium constant for this reaction is the Henry's Law constant for CO₂ in water, which is temperature-dependent and given as 3.4 x 10⁻² M/atm at 25°C.

The carbonic acid formed can dissociate in water to form hydrogen ions (H⁺) and bicarbonate ions (HCO₃⁻);

H₂CO₃(aq) ⇌ H⁺(aq) + HCO₃⁻(aq)

The equilibrium constant for this reaction is the acid dissociation constant (Ka₁) for carbonic acid, which is given as 4.45 x 10⁻⁷ at 25°C.

The hydrogen carbonate ion (HCO₃⁻) can also act as a weak acid and undergo further dissociation;

HCO₃⁻(aq) ⇌ H⁺(aq) + CO₃²⁻(aq)

The equilibrium constant for this reaction is the acid dissociation constant (Ka₂) for hydrogen carbonate ion, which is given as 4.69 x 10⁻¹¹ at 25°C.

Taking into account the autoionization of water, we can write the expression for the pH of rainwater as;

pH = 1/2(pKa₁ + pKw - log[H₂CO₃] - log(1 + [HCO₃⁻]/Ka₂))

where pKa1 is the negative logarithm of the acid dissociation constant for carbonic acid, pKw is the negative logarithm of the ion product constant for water (1.00 x 10⁻¹⁴ at 25°C), [H₂CO₃] is the initial concentration of carbonic acid, and [HCO₃⁻] is the concentration of hydrogen carbonate ion.

Substituting the given values, we get;

pH = 1/2(3.35 + 14 - log(1.39 x 10⁻⁵) - log(1 + 2.96 x 10⁻⁴/4.69 x 10⁻¹¹))

Simplifying, we get;

pH = 5.61

Therefore, pH of rainwater is 5.61.

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Answer:

Just a thing I need my brainliest!!

Explanation:

Also refered to as consumers, heterotrophs areorganisms that obtain their energy (nutrition) from organic compounds/materials.In other words, they are organisms that are unable to produce their ownfood (unlike autotrophs) and therefore have to consume/ingest organic compoundsas a source of energy. Compared to autotrophs (which occupy the base of thefood-web triangle), heterotrophs occupy the upper levels of the food web giventhat their survival is dependent on the producers

The sentence is: The water table, which is the top portion of the aquifer, is determined by the porosity of the ground, and can lead to the formation of an artesian spring.

The zone of saturation's top surface is known as the water table. The zone of saturation is the area where water has accumulated in the ground's pores and fissures. It can also be stated simply as the level of saturation of the ground.

The surface where the water pressure head equals atmospheric pressure (when gauge pressure equals zero) is known as the water table. It can be thought of as the "surface" of the subsurface materials in a specific area that are saturated with groundwater.

The groundwater may come from rainfall or groundwater that is entering the aquifer. Water permeates the unsaturated zone in locations with adequate precipitation by entering the soil's pore spaces. Water penetrates deeper and deeper into soil pores, saturating the zone of saturation as it does so. The layers of permeable rock that produce groundwater below the water table, in the phreatic zone (zone of saturation), are referred to as aquifers. The water table may be harder to pinpoint in less permeable soils, such as tight bedrock formations and old lakebed deposits.

Aquatic Springs occur when pressure-driven groundwater rises to the land's surface. The spring is able to flow because the pressure in the aquifer—a layer of impermeable soil or rock that contains water—is higher than the atmospheric pressure at the land.

When water rises to the surface without the aid of a pump, springs turn into artesian.

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Answer:

You didn't list any choices, but these are some common acids with their conjugate bases.

Explanation:

ACID CONJUGATE BASE

phosphoric acid dihydrogen phosphate ion

H₃PO₄ H₂PO₄⁻

acetic acid acetate ion

CH₃COOH CH₃COO⁻

hydrofluoric acid fluoride ion

HF F⁻

carbonic acid hydrogen carbonate ion

H₂CO₃ HCO₃⁻

hydrosulfuric acid hydrogen sulfide ion

H₂S HS⁻

Answer: The law of conservation of mass states that mass is neither created or destroyed, so the combined mass of all the products after the reaction will be the same as the mass of all the reactants and never more, but since the flask is not closed, the gases produced from the reaction will move into the atmosphere and the product left behind , the solids and/or liquids, will be the only products that you’ll end up weighing, meaning it’ll be less weight than the original reactants. The reason I’m interchanging weight and mass is because although weight changes with gravity, so long as the gravitational force stays constant throughout the experiment, it’s pretty much the same.

Explanation:

The compound that is not a covalent compound is C. NaNO2.

Covalent compounds are formed when atoms share electrons to form bonds. They typically consist of nonmetals or a combination of nonmetals and metalloids. On the other hand, ionic compounds are formed when there is a transfer of electrons from a metal to a nonmetal, resulting in the formation of ions held together by electrostatic forces.

(a) NO2 - Nitrogen dioxide: This is a covalent compound. It consists of a nitrogen atom bonded to two oxygen atoms through covalent bonds.

(b) Br2 - Bromine: This is also a covalent compound. It is composed of two bromine atoms that form a diatomic molecule through a covalent bond.

(c) NaNO2 - Sodium nitrite: This compound is not a covalent compound. It contains a metal (sodium) and a nonmetal (nitrogen). Sodium nitrite is an ionic compound formed by the transfer of an electron from sodium to nitrogen. The resulting ions, Na+ and NO2-, are held together by ionic bonds.

(d) NH3 - Ammonia: This is a covalent compound. It consists of a nitrogen atom bonded to three hydrogen atoms through covalent bonds.

In conclusion, among the given options, the compound that is not a covalent compound is C. NaNO2. It is an ionic compound due to the presence of a metal cation (Na+) and a nonmetal anion (NO2-). The other options, NO2, Br2, and NH3, are all covalent compounds.

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Answer

[H⁺] = 1.778 x 10⁻³ M

[OH⁻] = 5.624 x 10⁻¹² M

Explanation

Given:

The pH of the lemon juice = 2.75

What to find:

The [H⁺] and [OH⁻] of the lemon juice.

Step-by-step solution:

pH is a measure of hydrogen ion concentration, a measure of the acidity or alkalinity of a solution. The pH scale usually ranges from 0 to 14.

The equation for calculating pH is

Putting the values of pH as 2.75 into the equation above, the [H⁺] of the juice can be calculated as follows:

The [H⁺] = 1.778 x 10⁻³ M

The [H⁺] and [OH⁻] of an aqeuous solution is related by

So, putting [H⁺] = 1.778 x 10⁻³ M into the relation, we have [OH⁻] of the lemon juice to be:

Therefore, [H⁺] = 1.778 x 10⁻³ M and [OH⁻] = 5.624 x 10⁻¹² M

The equation that represents a single replacement reaction given the various options is 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)

A single replacement reaction, also known as single displacement reaction is a reaction in which elements higher in the electro-chemical series displace or replace elements lower in the electro-chemical series displace from a solution.

The following example illustrates single replacement reaction:

A + BC -> AC + B

From the above reaction, we can see that A has replace/displace B to from AC.

With the above information, we can determine the equation that represents single replacement reaction. Details below:

Equation from the questions:

From the above, we can see that only 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) conform to single replacement reaction.

Thus, the correct answer to the question is: 2Al(s) + 6HCl -> 2AlCl₃(aq) + 3H₂O(g) (option 2)

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Answer:

0.50 mols Ag

Explanation:

Given the data, we have:

mass= 54g

molar mass of Silver (Ag): 107.8 g/mol

We want moles, we can convert grams > moles using the molar mass as a "bridge" between the 2.

\(54g * \frac{1 mol}{107.8 g}= 0.50 mols Ag\)

Keeping an eye on the units, we'll see 54g get cancelled out by 107.8 g/mol and we'll be left with moles of Silver.

The image depicts the initial atoms when calcium and sulfur form an ionic compound is third number image. Therefore, option C is correct.

The term an ionic compound is defined as compounds consist of ions that produce charged particles when an atom or group of atoms gains or loses electrons. A cation is an ion charged positively, and an anion is an ion charged negatively.

Calcium (Ca) atom when reacts with sulfur (S) and produce an ionic compound. In the compound calcium sulphide, Ca acts as a cation, and S acts as an anion.

Thus, option C is correct.

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Answer:

C

Explanation:

a) The collision frequency of dimethyl ether can be calculated using the kinetic theory of gases. The collision frequency is given by the equation:

\(\[\text{{Collision frequency}} = \frac{1}{4} \sqrt{\frac{8 \cdot k \cdot T}{\pi \cdot m}}\]\)

where k is the Boltzmann constant, T is the temperature in Kelvin, and m is the mass of dimethyl ether molecule. Given that the angle-averaged radius of dimethyl ether is 0.25 nm, we can calculate the mass of the molecule using its density or molar mass.

b) To calculate the decomposition rate constant of (CH3)2CO, we need additional information such as the reaction mechanism and reaction conditions. The rate constant for a chemical reaction depends on factors like temperature, activation energy, and the presence of catalysts. Without these details, it is not possible to calculate the decomposition rate constant accurately.

In conclusion, the collision frequency of dimethyl ether at a specific temperature can be calculated using the kinetic theory of gases. However, to calculate the decomposition rate constant of (CH3)2CO, additional information about the reaction conditions and mechanism is needed.

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The most dangerous problems with electrolyte balance are caused by an imbalance between gains and losses of sodium, potassium, calcium, and chloride ions.

Electrolytes are essential for numerous bodily functions, including maintaining proper fluid balance, transmitting nerve impulses, and regulating muscle contractions. An imbalance in electrolyte levels can lead to a variety of health problems, including muscle weakness, irregular heartbeat, seizures, and even death.

The most important electrolytes for proper bodily function are sodium, potassium, calcium, and chloride ions. An imbalance in the gains and losses of these electrolytes can be caused by a variety of factors, including dehydration, kidney disease, and certain medications. It is important to maintain a proper electrolyte balance through a healthy diet and adequate hydration to prevent these dangerous imbalances.

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Answer:

La fuerza de atracción en el hielo sólido, que es un compuesto molecular, se debe al enlace de hidrógeno (que es la fuerza intermolecular más fuerte) entre las moléculas individuales de agua, por lo tanto, el hielo sólido es bastante fuerte y se mantiene en una estructura rígida.

Cuando el hielo se calienta, las moléculas absorben suficiente energía y, en lugar de solo la vibración del hidrógeno dentro de un área muy pequeña, los enlaces de hidrógeno se doblan y se estiran, con los ángulos y la longitud de los enlaces oscilando dentro de los rangos esperados.

Como tal, las fuerzas de atracción en el agua líquida son menores que las del hielo y las fuerzas de repulsión entre cargas similares tienen un efecto mayor en la plasticidad del agua que el hielo.

Explanation:

Answer:

Nicotene

Explanation: