Which of the following is NOT an element of set 18?
a. Helium
b. silicon
c. Neon
d. krypton

Calcium ion created by the calcium atom losing two electrons has 18 electrons.

A neutral calcium atom has 20 electrons. When it loses two electrons, it becomes a calcium ion with a +2 charge. Since electrons have a negative charge, a calcium ion with a +2 charge will have 2 fewer electrons than a neutral calcium atom.

The calcium ion is a positively charged ion that has lost two electrons from the neutral calcium atom. It has a 2+ charge and is represented as Ca2+. The electronic configuration of the calcium ion is 1s² 2s² 2p⁶ 3s² 3p⁶, which means it has a total of 18 electrons. Thus, a calcium ion with a +2 charge will have 18 electrons.

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All of them have the same kinetic energy, with 298 K having the highest average kinetic energy per mole.

Kinetic energy is the energy of motion. Any object that is moving possesses kinetic energy, and the amount of energy it has is proportional to its mass and velocity. The formula for calculating kinetic energy is KE=1/2mv^2, where m is the mass of the object and v is its velocity. The kinetic energy of an object can be transformed into other forms of energy, such as potential energy, heat, or work. In physics, kinetic energy is an important concept that is used to describe the behavior of moving objects and their interactions with other objects or systems. Examples of kinetic energy in everyday life include a moving car, a swinging pendulum, a bouncing ball, or a running athlete. Understanding kinetic energy is essential for many fields of science, such as mechanics, thermodynamics, and electromagnetism.

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The aqueous solutions has the highest boiling point is 0.1M BaCl₂ because it dissociates into three ions in solution, which is the highest number of ions. Option C is correct.

The boiling point of a solution is directly related to the concentration of solute particles in the solution. A solution having a higher concentration of solute particles will have a higher boiling point.

Out of the given options, BaCl₂ dissociates into three ions (Ba²⁺, 2Cl⁻) in solution, K₂SO₄ dissociates into three ions (2K⁺, SO₄²⁻) in solution, Na₃PO₄ dissociates into four ions (3Na⁺, PO₄³⁻) in solution, and KNO3 dissociates into two ions (K⁺ NO₃⁻) in solution.

Therefore, the aqueous solution with the highest boiling point will be the one that dissociates into the most number of ions i.e 0.1M BaCl₂.

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The names of the some first generation antipsychotic drugs are the Chlorpromazine, the Droperidol, the Fluphenazine, Haloperidol, the Loxapine.

The Antipsychotics drugs are the type of the psychiatric medication that are available on the prescription to treat the psychosis. They are the licensed to treat the certain types of the mental health problem and whose symptoms are  include psychotic experiences. The some of the  First Generation Antipsychotic Drugs are :

The Antipsychotics drugs also known as the neuroleptics, they are the class of the psychotropic medication that are primarily used to manage the psychosis.

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We can see that Trial 1 was more efficient than Trial 2, since it had a higher percentage yield. This suggests that using a smaller amount of oxygen relative to SiCl₄ is more efficient for this reaction

What is Percentage Yield?

It compares the actual yield of a reaction to the theoretical yield that would be obtained if the reaction proceeded perfectly, and expresses the result as a percentage.

To calculate the percentage yield for SiO₂ in Trial 1, we first need to determine the theoretical yield. We can do this by using stoichiometry and the amount of SiCl₄, which is the limiting reactant:

1 mole SiCl₄ reacts with 1 mole O₂ to produce 1 mole SiO₂ and 1 mole Cl₂

The molar mass of SiCl₄ is 169.9 g/mol, so 100 g of SiCl₄ is equivalent to 100/169.9 = 0.588 moles.

Since 32.96 g of O₂ was used, which has a molar mass of 32 g/mol, this is equivalent to 32.96/32 = 1.03 moles of O₂.

Since oxygen is the excess reactant, we can use the amount of SiCl₄ to calculate the theoretical yield of SiO₂:

0.588 moles SiCl₄ × 1 mole SiO₂/1 mole SiCl₄ × 60.1 g SiO₂/1 mole SiO₂ = 35.8 g SiO₂

The actual yield of SiO₂ in Trial 1 was 50 g. Therefore, the percentage yield is:

(50 g SiO₂/35.8 g SiO₂) × 100% = 139.7%

This indicates that the experiment produced more SiO₂ than was theoretically predicted. There are a number of possible reasons for this, such as experimental error or the presence of impurities in the reactants.

To determine the leftover reactant, we can use stoichiometry and the amount of SiCl₄ that was used:

0.588 moles SiCl₄ - 0.5 moles SiO₂ produced = 0.088 moles SiCl₄ remaining

The leftover reactant is equivalent to:

0.088 moles SiCl₄ × 169.9 g SiCl₄/1 mole SiCl₄ = 15 g SiCl₄

Therefore, 15 g of SiCl₄ was leftover in Trial 1.

b. We can use the percentage yield from Trial 2 to determine which ratio of reactants is more efficient. Since the amount of SiCl₄ was kept constant, the change in the yield must be due to the change in the amount of O₂. To compare the efficiency of different ratios, we can calculate the theoretical yield for each trial and compare it to the actual yield:

Trial 1: Theoretical yield of SiO₂ = 35.8 g, actual yield = 50 g, percentage yield = 139.7%

Trial 2: Theoretical yield of SiO₂ = 107.4 g, actual yield = 60 g, percentage yield = 55.8%

From these results, we can see that Trial 1 was more efficient than Trial 2, since it had a higher percentage yield. This suggests that using a smaller amount of oxygen relative to SiCl₄ is more efficient for this reaction.

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An atom can become a positive or negative ion depending on the number of electrons it possesses.

An atom can become a positive ion when it loses electrons, and a negative ion when it gains electrons. This is because all atoms have an equal number of protons, which carry a positive charge, and electrons, which carry a negative charge.

When the number of electrons compared to protons is changed, the atom can either become positively charged or negatively charged. For example, if an atom with six protons loses one electron, it will have five electrons and six protons, resulting in a net positive charge.

Alternatively, if the atom gains an electron, it will have seven electrons and still six protons, resulting in a net negative charge.

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An atom of copper has an atomic mass of 63.546 amu. So, the molar mass of copper metal is equals to the 63.546 g/mol.

Molar mass is defined as the mass of a mole of that substance. For an atom, the molar mass of the element is also known as atomic mass (mass of 1 mole of an atom). For molecules, the molar mass is also known as molecular mass (Mass of 1 mole of the molecule). The units of molar mass is grams per mole. The unit of atomic mass is atomic mass unit, a.m.u. Cu (Copper) is a transition element whose atomic number is 29. The number of protons in copper atom = 29.

The number of neutrons in copper atom = 35. The atomic mass or mass number of copper is 63.546 amu. The molar mass of any element is equal to its

atomic mass and has the units g/mol. So, the molar mass of copper is 63.546 g/mol.

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The mass of KHP dissolved in 50.00 mL of the standardizing KHP titrant is 0.2505 g. The answer is 0.28 g, rounded to two significant figures . The correct answer is (C).

The balanced chemical equation for the reaction of potassium hydrogen phthalate (KHP) with sodium hydroxide (NaOH) is:

KHP + NaOH → NaKP + H2O

From the given information, we know that 22.20 mL of KHP is neutralized by 25.00 mL of NaOH of concentration 0.049 M. Therefore, we can calculate the amount (in moles) of NaOH used:

moles NaOH = volume × concentration = 25.00 mL × 0.049 mol/L = 0.001225 mol

Since the reaction between KHP and NaOH is 1:1, the amount of KHP used is also 0.001225 mol. We can use the molar mass of KHP to calculate the mass of KHP dissolved in 50.00 mL of the standardizing KHP titrant:

mass KHP = moles KHP × molar mass KHP = 0.001225 mol × 204.23 g/mol = 0.2505 g

Therefore, the mass of KHP after standardization is 0.2505 g. Rounded to two significant figures, the answer is 0.28 g. So, correct option is (C).

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The three pKa values of aspartic acid exists 1.89, 3.65 and 9.60.

Due to the presence of two carboxyl groups in the molecule, aspartic acid has an isoelectric point of 2.77. Carboxyl groups attached to alpha carbon have a pKa value of 1.88, -COOH groups attached to side chains have a pKa value of 3.65, and amino groups have a pKa value of 9.60. The sum of pKa1 and pKa3 is divided in half to determine the isoelectric point.

Depending on their side chains, the proteinogenic amino acids are amphoteric and have two or three pK values. The -carboxyl group is represented by pKa1, the -ammonium ion is represented by pKa2, the side chain group, if any, is represented by pKa3, and the isoelectric point, at which the amino acid has no net charge, is represented by pI.

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The percent composition by mass of sulfur in the compound mgso4 would be 27%.

The ability to calculate the amount of each ingredient in a compound makes understanding its % composition crucial.

The ratio of each element's amount to the sum of all the individual elements present in the compound, multiplied by 100, is the definition of an element's percentage composition. Here, the amount is expressed in grams of the constituent parts.

A simple concept is percent composition. The mass percentage of each element in a compound is indicated by its percent composition. The fusion of two or more elements results in a chemical product.

The percent composition by mass of sulfur be:

% S = mass of sulfur / mass of compound x 100%

substitute the values in the above equation, we get

= 32 amu / 120 amu x 100% %S

= 0.266666 x 100% %S = 26.66%

Rounded off to two significant numbers it would be 27%.

Therefore the correct answer is 27%.

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As a result, the stoichiometric ratio between the reactant, mg ribbon, and the product, hydrogen gas, in the reaction used to calculate the molar volume of gas is 1:1.

One mole of a substance occupies a certain amount of space (designated by the symbol Vm) at a specific temperature and pressure. It is determined by dividing the substance's molecular mass (M) by its density () at the specified temperature and pressure. The SI unit for it is the cubic meter per mole (m3/mol). Cubic meters per mole (m3/mol) is the SI unit for molar volume. The moles per liter of a solution—the measurement of concentration molarity—are referred to as "molars" in this context. The phrase is most frequently used in chemistry to refer to a solute's molar concentration in a solution. Molar concentration is measured in mol/L or M.

Thinking about things from the a molecular perspective is a beneficial quality. All perfect gases will have the same molar volume since they all have the same number density. This will be 22.4 L at STP. This is helpful if you want to visualize the separation of molecules in various samples.

A form's volume is essentially equal to the product of its area and height. Volume = Height x Base Area.

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BeCl₂ is a nonpolar molecule.



A molecule can be polar or nonpolar depending on the arrangement of atoms and the electronegativity difference between them. If the electronegativity difference between two atoms is greater than 0.4, the bond between them is considered polar.

In the case of BeCl₂, the molecule has a linear shape with the two chlorine atoms bonded to the central beryllium atom.

The electronegativity difference between beryllium and chlorine is 1.5, which indicates that the bonds are polar. However, because the molecule is linear, the dipole moments of the two polar bonds cancel out, resulting in a nonpolar molecule.

BeCl₂ is a nonpolar molecule because the dipole moments of the polar bonds cancel out due to the molecule's linear shape.

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The equation for the reaction of iron (iii) phosphate with sodium sulfate to make iron (iii) sulfate and sodium phosphate is 2 FePO₄ + 3 Na₂SO₄ ⇒ Fe₂(SO4)₃ + 2 Na₃PO₄.

Each atom on both sides of a balanced chemical equation has the same number and type. A balanced equation's coefficients must have the simplest whole number ratio. In chemical reactions, mass is always conserved.

2 FePO₄ + 3 Na₂SO₄ ⇒ Fe₂(SO4)₃ + 2 Na₃PO₄ this is a balanced chemical equation for iron (iii) phosphate with sodium sulfate to make iron (iii) sulfate and sodium phosphate.

Thus, the reaction is 2 FePO₄ + 3 Na₂SO₄ ⇒ Fe₂(SO4)₃ + 2 Na₃PO₄.

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A gas within a piston-cylinder assembly undergoes a thermodynamic cycle consisting of Isothermal expansion, Adiabatic expansion, Isothermal compression, and Adiabatic compression.

Isothermal expansion: This stage involves the gas gradually increasing in volume while maintaining a stable temperature.

Adiabatic expansion: Here, the gas expands swiftly in a heat-isolated environment, leading to a decrease in temperature.

Isothermal compression: In this stage, the gas experiences a decrease in volume as it is compressed at a regulated temperature.

Adiabatic compression: During this process, the gas is compressed at a rapid pace without exchanging heat with the surrounding, causing an increase in temperature.

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The Diels-Alder product formed by the reaction of a diene and a dienophile can be predicted based on the regiochemistry and stereochemistry of the reaction.

In a typical Diels-Alder reaction, the diene (a conjugated hydrocarbon with two double bonds) reacts with a dienophile (a molecule with a double bond) to form a six-membered ring. The reaction is typically exothermic and is characterized by a concerted mechanism. The regiochemistry of the product is determined by the relative orientation of the diene and the dienophile, with the dienophile typically adding to the diene in an endo fashion.

The stereochemistry of the product is determined by the addition of the dienophile to the diene. If the dienophile adds to one face of the diene, a cis product is formed, whereas if it adds to the opposite face, a trans product is formed. In addition, the reaction can be influenced by various factors such as steric hindrance, electronic effects, and temperature. Therefore, predicting the Diels-Alder product requires careful consideration of all of these factors.

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Hydrogen gas bubbles are produced when hydrochloric acid is used to treat lead.  [tex]$\mathrm{Pb}+2 \mathrm{HCl} \rightarrow \mathrm{PbCl}_2+\mathrm{H}_2[/tex]

(a) Because silver is low on the metal reactivity scale, it does not react with diluted HCl.

(b) Because the reaction is exothermic, the temperature of the reaction mixture increases when aluminum is added.

(c) Because sodium is very reactive and produces an exothermic reaction that raises temperature, it is discovered that the reaction of sodium metal is highly explosive.

(d) Hydrogen gas bubbles are produced when hydrochloric acid is used to treat lead.

[tex]$\mathrm{Pb}+2 \mathrm{HCl} \rightarrow \mathrm{PbCl}_2+\mathrm{H}_2[/tex]

The complete question is:

During the reaction of some metals with dilute hydrochloric acid, following observations were made.

(a) Silver metal does not show any change

(b) The temperature of the reaction mixture rises when aluminium (Al) is added.

(c) The reaction of sodium metal is found to be highly explosive

(d) Some bubbles of gas are seen when lead (Pb) is reacted with the acid.

Explain these observations giving suitable reasons.

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Magnesium hydroxide can be separated from a mixture of magnesium hydroxide and zinc hydroxide by adding more hydroxide (NaOH) then filter off the liquid containing the zinc, all you will have left is solid magnesium hydroxide.

This is referred to as a process of separating a solid from a fluid through a porous material that holds the solid and fluid passes through.

Adding more hydroxide (NaOH) then filter off the liquid containing the zinc, all you will have left is solid magnesium hydroxide.The zinc will form the (Zn(OH)) and go into solution leaving the magnesium hydroxide untouched. If you filter off (or simply decant) the liquid containing the zinc, all you will have left is solid magnesium hydroxide.

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The products of the Citric Acid cycle are:
- 2 molecules of ATP (adenosine triphosphate)
- 6 molecules of NADH (nicotinamide adenine dinucleotide)
- 2 molecules of FADH₂ (flavin adenine dinucleotide)
- 4 molecules of CO₂ (carbon dioxide)

The Citric Acid cycle, also known as the Krebs cycle or the tricarboxylic acid (TCA) cycle, is a series of chemical reactions that take place in the mitochondrial matrix of eukaryotic cells.

These products are given off in different steps of the Citric Acid cycle. The 2 molecules of ATP are produced in the substrate-level phosphorylation step, the 6 molecules of NADH are produced in the oxidation steps, the 2 molecules of FADH₂ are produced in the succinate dehydrogenase step, and the 4 molecules of CO₂ are produced in the decarboxylation steps.

The products of the Citric Acid cycle are used in other metabolic processes, such as the electron transport chain, to produce more ATP for the cell. The NADH and FADH₂ molecules are used as electron carriers in the electron transport chain, which produces a large amount of ATP. The CO₂ molecules are given off as waste products and are exhaled from the body during respiration.

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Energy stored in chemical bonds is known as "Potential Energy." The other type of energy is Kinetic Energy.

Potential energy is energy stored in chemical bonds. Potential energy is the energy associated with an object due to its position or structure. For example, the energy in a molecule's chemical bonds is related to the structure of the molecule and the positions of its atoms relative to one another. Potential energy can be seen in everyday situations such as the energy held behind a dam or a person about to skydive out of an airplane.

On the other hand, kinetic energy is the energy associated with an object’s motion. Kinetic energy can be found in anything that moves around us. Walking, soaring, falling, flying, and throwing are all examples of kinetic energy.

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The electron configuration for hydrogen is written as 1s¹.

The distribution of electrons in an element's atomic orbitals is described by its electron configuration. Atomic electron configurations adhere to a standard nomenclature in which all electron-containing atomic subshells are arranged in a sequence with the number of electrons they each possess indicated in superscript.

Hydrogen is the simplest electron configuration to write since it just contains one electron. Around the hydrogen nucleus, there is essentially just one electron. Hydrogen only has one electron, hence its configuration is 1s¹.

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Zero-order kinetics is defined as the kinetics that undergoes constant elimination regardless of the plasma concentration, following a linear elimination phase as the system that becomes saturated.

Zero-order reaction is generally defined as a chemical reaction wherein the rate does not vary with the increase or decrease in the concentration of the reactants.

A few substances are often eliminated by means of zero-order elimination kinetics, because their elimination process is saturated. Examples of zero order kinetics are Ethanol, Phenytoin, Salicylates, Cisplatin, Fluoxetin, Omeprazol.

The integrated rate law for the zero-order kinetics is given as A →  [A]t = -kt + [A](0). This is because this equation has the form y = mx + b, a plot of the concentration of A as a function of time yields a straight line.

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Answer:

things such as pen , pensils , sharpener , chalk ,

they all come under solid mixtures

The Parkland formula is used to calculate the amount of fluid needed to resuscitate a burn victim. The formula is as follows:
Parkland formula = 4 mL x % of total body surface area burned x body weight (in kg)

To calculate the Parkland formula, follow these steps:

1. Determine the percentage of the total body surface area that has been burned. This can be done using the "rule of nines," which divides the body into sections, each representing 9% of the total body surface area.
2. Multiply the percentage of the total body surface area burned by 4 mL. This will give you the amount of fluid needed per kilogram of body weight.
3. Multiply the amount of fluid needed per kilogram of body weight by the patient's body weight in kilograms. This will give you the total amount of fluid needed for resuscitation.
4. The total amount of fluid should be given over the first 24 hours after the burn, with half of the fluid given in the first 8 hours, and the remaining half given over the next 16 hours.

For example, if a patient has 30% of their total body surface area burned and weighs 70 kg, the Parkland formula would be calculated as follows:

Parkland formula = 4 mL x 30% x 70 kg = 8400 mL
Half of the fluid (4200 mL) would be given in the first 8 hours, and the remaining half (4200 mL) would be given over the next 16 hours.

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Yes, the Chlorine Cl have the high electronegativity. The electronegativity of the chlorine is 3.16.

The chlorine that is the Cl has the very high electronegativity this is because it has the seven electrons in its valence shell or the outermost shell and it only needs one electron to become more stable like the noble gas. The chlorine has the tendency to attract the electrons towards itself.

The Electronegativity is the chemical property that will describes the tendency of an atom or the functional group to attract the electrons toward itself. The value of the electronegativity of the chlorine is 3.16 and this is the high electronegativity value.

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The name of the compound HI is Hydrogen iodide.

The compound HI contains one hydrogen and one Iodine atom. The chemical name of the compound will be Hydrogen Iodide according to the IUPAC nomenclature of non organic compounds.

Whether in a continuous chain or a ring, the longest chain of carbons joined by a single bond serves as the basis for IUPAC nomenclature. According to a certain set of priorities, any deviations, whether multiple bonds or atoms other than carbon and hydrogen, are denoted by prefixes or suffixes. Similar restrictions are placed on the naming of inorganic compounds.

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The first plateau denotes the solvent's pure boiling point.

Boiling point elevation refers to the increase in a solvent's boiling point brought on by the presence of a solute. Similar to this, freezing point depression refers to a solvent's freezing point being lowered as a result of the addition of a solute. A solvent's freezing point actually drops as its boiling point rises.

The phenomenon known as boiling-point elevation states that the boiling point of a liquid will increase when another chemical is added, i.e., a solution has a higher boiling point than a pure solvent. When a non-volatile solute, like salt, is added to a pure solvent, like water, this occurs. The first plateau denotes the solvent's pure boiling point.

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In a polar covalent bond, electrons are shared unequally. The correct alternative is option b.



A polar covalent bond is a type of bond in which electrons are shared unequally between two atoms. This unequal sharing of electrons results in a partial negative charge on one side of the bond and a partial positive charge on the other side.

This charge separation creates a dipole, which is a molecule with two poles.

The unequal sharing of electrons is due to the difference in electronegativity between the two atoms. The atom with the higher electronegativity will have a greater attraction for the electrons and will therefore have a partial negative charge, while the atom with the lower electronegativity will have a partial positive charge.

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C-H bonds are considered nonpolar because the electronegativity difference between carbon and hydrogen is very small.

Electronegativity is a measure of how strongly an atom attracts electrons in a bond. When the difference in electronegativity between two atoms is large, the bond is considered polar, meaning that one atom has a stronger pull on the shared electrons than the other.

However, when the difference is small, the bond is considered nonpolar, meaning that the shared electrons are equally distributed between the two atoms.

Since the electronegativity difference between carbon and hydrogen is only 0.35, the C-H bond is considered nonpolar. This means that the shared electrons are equally distributed between the carbon and hydrogen atoms, resulting in a balanced distribution of charge.

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The H NMR, integration of the peak that gives the area of the peak and the area will gives us the measure of the number of the H atoms .

The H NMR, is the integration of the peak that will gives the area of the peak and the area gives us the measure of the number of the H atoms it will represents the number of the H atoms of that type. The Integration is the mathematical term that defines the area under the curve.

In NMR, the curve represents the spectra, and the integration will measure the area of the peaks in to the spectra. The area of the peak is directly  proportional to the number of the atoms that it will represents.

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Some examples of heterogeneous mixtures are oil and water, sand and water, kerosene, and water, oil and vinegar, smog (gas + solid), soda (water + CO2), etc.

A heterogeneous mixture is a kind of mixture in which all the components are entirely mixed and all the particles can be noticed under a microscope. We can readily recognize the components and more than one phase can be glimpsed by the bare eyes. Heterogeneous mixtures are not consistent. If you endure two selections from various parts of the mixture, they will not have an identical composition. You can utilize a mechanical technique to isolate components of a heterogeneous mixture.

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