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A pure substance has definite composition and constant properties in all of the sample

Characteristics and Properties Of Pure Substances

Thus we can conclude that  a pure substance has definite composition in all of the sample

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Out of given data, all data is close to actual value, so all are precise but only first data is very much close to actual value so it is accurate.

When measuring data, precision and accuracy are two crucial considerations. Both precision and accuracy indicate how closely a measurement comes to the real value.

But accuracy also indicates how closely a measurement resembles a known or recognized value, while precision indicates how repeatable a measurement is, even if it is far from the acceptable value. Out of given data, all data is close to actual value, so all are precise but only first data is very much close to actual value so it is accurate.

Therefore, out of given data, all data is close to actual value, so all are precise but only first data is very much close to actual value so it is accurate.

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The proper order of increasing bond strength is:

D) triple < double < single.

In general, the strength of a chemical bond is determined by the number of bonds between atoms. A triple bond consists of three shared electron pairs and is stronger than a double bond, which consists of two shared electron pairs. Similarly, a double bond is stronger than a single bond, which consists of only one shared electron pair. Therefore, the correct sequence is triple < double < single, as stated in option D.

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Answer:

79.5

Explanation:

7.95x10^7 IS 79500000.

If you bring the decimal point left 6 more times it would be 79.500000

Reactions according to Bronsted are those in which there is an exchange of H+ ions. The Bronsted acid will be the substance that donates H+ ions and the base will be the compound that receives them.

As a result we will have a conjugated acid and a conjugated base. The conjugate acid will be the former base that just received the H+ ions. The conjugate base will be the former acid that donated its H+ ions.

Now let's look at the reaction. On the reactants side the compound that can donate H+ ions will be HSO3- and the compound CN- will be the one that receives them. Therefore, HSO3 will be the Bronsted acid (A) and CN will be the base (B).

HSO3 ---> A

CN -----> B

Now let's look at the product side. The compound that received the H+ ions will be the compound HCN, so this will be the conjugate acid (Ac). And the compound that lost its H+ ions is SO3, so it will be the conjugate base (Bc).

HCN --->Ac

SO3 ---->Bc

Comparing the analysis that we did with the reaction we will have that:

So, the answer will be option number 5

The following chemical equation 2C8H18(g)+ 25O2(g)→ 16CO2(g)+ 18H2O(g) is balance and 48.64 grams of oxygen is required in the combustion of octane in gasoline.

When burning of petrol happens and releases toxic hydrocarbons and carbon dioxide gasses with some amount of oxygen is known as combustion.

The balanced chemical equation is 2C8H18(g)+ 25O2(g)→ 16CO2(g)+ 18H2O(g),

                      number of moles = mass / molar mass

substituting the value in equation,

                      number of moles = 14 / 114g = 0.122 moles.

number of moles of oxygen 0.122 × 0.122 moles. = 1.52 moles.

                    1.52 = mass / 32

                      mass = 48.64 gram.

Therefore,48.64 grams of oxygen is required in the combustion of octane in gasoline.

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The balanced chemical equation would be as follows,

C8H18(g)+12.5 O2(g)→ 8 CO2(g)+ 9 H2O(g)

105.26  grams of oxygen are required to react with 14.0 grams of octane ( C8H18 ) in the combustion of octane in gasoline.

A chemical reaction is a process in which one or more substances, also known as reactants are converted to one or more different substances, known as products. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products

The balanced chemical equation would be as follows,\

C8H18(g)+12.5 O2(g)→ 8 CO2(g)+ 9 H2O(g)

114 grams of octane ( C8H18 ) require 400 grams of oxygen

1 gram of octane requires 400/114 grams of oxygen

30 grams of octane require 400/114×30 grams of oxygen

30 grams of octane require 105.26  grams of oxygen

Thus,105.26  grams of oxygen are required to react with 14.0 grams of octane ( C8H18 ) in the combustion of octane in gasoline.

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Answer:

in contact

Explanation:

Fields allow some objects to exert force on each other even when they are not contact with one another.

The region of space where the effect of a force is felt is know as a field.

Fields allow some objects to exert forces on each other even when they are not in contact .

Answer:

Answer is 2nd

Explanation:

some energy is transformed into mass

Answer:

keep it from being washed away by water

The mass of (NH4) 2S in the solution is : Mass = 0.0600 mol × 60.08 g/mol = 3.60 g.

The given molarity and volume of the solution can be used to calculate the number of moles of ammonium sulfide (NH4)2S.Then, the number of moles can be converted to mass using the molar mass of (NH4)2S.Mass of ammonium sulfide (NH4)2S in 3.00 L of a 0.0200 M solution is given by : Mass = moles × molar mass.The number of moles of (NH4)2S can be found using the equation:Molarity = Number of moles / Volume.Rearranging this equation, we get:Number of moles = Molarity × Volume Number of moles of (NH4)2S = 0.0200 M × 3.00 L.Number of moles of (NH4)2S = 0.0600 mol.The molar mass of (NH4)2S can be calculated by summing the molar masses of ammonium (NH4) and sulfide (S) ions.Molar mass of (NH4)2S = (2 × Molar mass of NH4) + Molar mass of S= (2 × 14.01 g/mol) + 32.06 g/mol= 60.08 g/mol.

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Litmus is a type of dye that is extracted from lichens and is commonly used as a pH indicator. The color change from purple to pink indicates a change in the acidity or basicity of a solution.

In an acidic solution, the hydrogen ion (H+) concentration is high, which causes the litmus dye to change from its original blue color to red. In a neutral or basic solution, the hydrogen ion concentration is low, and the litmus dye remains blue. However, if the solution is sufficiently basic, the litmus dye will change from blue to pink. The exact mechanism of this color change is due to the chemical structure of the litmus dye, which contains a variety of functional groups that can interact with hydroxide ions (OH-) in a basic solution. This interaction causes a change in the electronic structure of the dye molecules, which results in a change in their absorption and transmission of light and, therefore, a change in color.

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Answer: A.

Explanation:

Brownian motion is the random motion of a particle as a result of collisions with surrounding gaseous molecules. Diffusiophoresis is the movement of a group of particles induced by a concentration gradient. This movement always flows from areas of high concentration to areas of low concentration.

Example:  The movement of pollen grains on still water. Motion of dust motes in a room (though largely influenced by air currents).

The student's claim of 4.64 × 10^24 molecules is incorrect, and the correct number of molecules of ammonium acetate used in the reaction is 6.022 × 10^22 molecules.

The mistake the student made is assuming that the molar mass of ammonium acetate directly corresponds to the number of molecules. However, the molar mass of a substance represents the mass of one mole of that substance, not the number of molecules.

To determine the correct number of molecules of ammonium acetate used in the reaction, we need to use Avogadro's number, which relates the number of particles (atoms, molecules, etc.) in one mole of a substance.

Avogadro's number is approximately 6.022 × 10^23 particles/mol. Given that the student used 0.100 mol of ammonium acetate, we can calculate the correct number of molecules by multiplying the number of moles by Avogadro's number:

Number of molecules = (0.100 mol) × (6.022 × 10^23 molecules/mol)

Performing the calculation, we find that the correct number of molecules of ammonium acetate used in the reaction is 6.022 × 10^22 molecules.

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The type of fatty acid which do not bind together due to the bend in the structure ae unsaturated fatty acids which have branched chain structures.

The unsaturated fatty acids are those which have one or more carbon-carbon double bonds. For example: palmitoleic acid, oleic acid are considered as unsaturated fatty acids. The unsaturated fatty acids cannot be tightly packed due to which it makes them easier to pass more fluidly through the body.

The monounsaturated fatty acids are also liquid at room temperature due to the bend structure. On the other hand, saturated fatty acids can be easily packed as they are generally straight chain compounds.

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Approximately 952,746.676 joules of energy must be added to raise the temperature of 90 gallons of water from 25°C to 92°C.

To calculate the energy required to raise the temperature of water, you can use the specific heat capacity formula:

Q = m * c * ΔT

Where:

Q is the energy (in joules)

m is the mass of water (in kilograms)

c is the specific heat capacity of water (in joules per kilogram per degree Celsius)

ΔT is the change in temperature (in degrees Celsius)

First, let's convert the given volume of water from gallons to liters. Since 1 gallon is approximately equal to 3.78541 liters, we have:

90 gallons * 3.78541 liters/gallon ≈ 340.691 liters

Next, we need to convert the volume of water to mass. The density of water is approximately 1 kilogram per liter, so:

m = 340.691 liters * 1 kg/liter ≈ 340.691 kg

The specific heat capacity of water is approximately 4.186 joules per gram per degree Celsius, which is equivalent to 4.186 × 10³ joules per kilogram per degree Celsius.

c = 4.186 × 10³ J/(kg·°C)

Now we can calculate the energy required:

ΔT = 92°C - 25°C = 67°C

Q = 340.691 kg * (4.186 × 10³ J/(kg·°C)) * 67°C

Calculating the product:

Q ≈ 952,746.676 joules

Therefore, approximately 952,746.676 joules of energy must be added to raise the temperature of 90 gallons of water from 25°C to 92°C.

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Answer:

The cell's DNA is replicated during the S stage as the first step to engaging in mitosis. Once DNA replication is complete, the cell enters the second gap stage, G2. During G2 the correct duplication of the DNA is verified and cell proteins necessary for cell division are produced.

Explanation:

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A structural isomer is a compound that has the same number of atoms but is arranged differently. Therefore, to know which will be the structural isomer of the compound they give us, we must count the atoms of each compound.

When comparing the compounds we see that pent-2-yne has C5H8 just like 3-methylcyclobutene, therefore these two compounds are structural isomers.

The answer will be: 3-methylcyclobutene

Answer:

Rocky road ice cream is an example of a __________Homogeneous___________ mixture.

Answer:

Conclusion call the organized steps taken to answer a scientific problem.

The Scientific Method is defined as a logical and rational order of steps through which scientists come to conclusions related to the world around them. The Scientific Method helps in the organization of thoughts and procedures by which the scientists are in confident in the answers they find.

OBSERVATION is considered as the first step through which they get to know how they want to go about your research.

HYPOTHESIS is the step in which we think hypothetical means about the answer which we have to find.

PREDICTION is our specific belief about our scientific idea:like, If my hypothesis is true, then I predict we will discover this.

EXPERIMENT is defined as the tool that we invent to answer our question.

CONCLUSION is the answer which our experiment gives.

Thus, we concluded that the Conclusion call the organized steps taken to answer a scientific problem.

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In the mole ratio. If you have moles of one substance. And the coefficients from the balanced equation you can use the ratio to figure out the moles of the other compounds.

Answer:

A structure made of building blocks * The blocks of the same structure ... A lump of clay * The same lump broken into three pieces * 1 cup of water and one ... The melted remains of the same snowman

Answer: c

Explanation:

The compounds made of the following molecules can be ordered by increasing melting point as follows: CH4 < H2O < NaCl.

1. CH_{4} (Methane) - This compound is a non-polar covalent compound, meaning that its melting point is determined by the weak dispersion forces between the molecules. Therefore, CH_{4} has the lowest melting point.
2. H_{2}O (Water) - This compound has polar covalent bonds and exhibits strong hydrogen bonding, which leads to a higher melting point than CH_{4}. However, it is still lower than the melting point of an ionic compound.
3. NaCl (Sodium Chloride) - This compound is an ionic compound, with strong electrostatic forces between the positively charged sodium ions and the negatively charged chloride ions. This results in a higher melting point than both CH_{4} and H_{2}O.
By analyzing the intermolecular forces present in CH_{4}, H_{2}O, and NaCl, we can order these compounds by increasing melting point as CH_{4} < H_{2}O < NaCl.
Considering the types of chemical bonds and intermolecular forces present in each compound (non-polar covalent bonds in CH_{4}, polar covalent bonds and hydrogen bonding in H_{2}O, and ionic bonds in NaCl), we can determine their melting points. In general, ionic compounds have the highest melting points, followed by compounds with hydrogen bonding, and finally non-polar covalent compounds. With this information, we can confidently order the compounds by increasing melting point asCH_{4} < H_{2}O < NaCl.

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Answer:

Specialized cells are found only in multicellular organisms.

Explanation:

Or organisms are made up of more than one cell.

Specialized cells are generally found only in multicellular organisms.

A multicellular organism can be described as an organism that contains more than one cell, in contrast to a unicellular organism. Multicellularity has been independently at least 25 times in eukaryotes and in some prokaryotes, like myxobacteria, cyanobacteria, and actinomycetes.

All species of animals, plants, and most fungi are multicellular organisms, whereas a few organisms are partially uni- and partially multicellular, such as slime molds and social amoebae.

Multicellular organisms develop in many ways such as by cell division or by aggregation of many single cells. Colonial organisms can be defined as identical individuals joining together to form a colony.

Unicellular organisms are divided, and the daughter cells failed to separate which results in a conglomeration of identical cells in one organism, which could develop specialized tissues.

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The results illustrate the law of multiple proportions since the oxygen atoms in A and B are in simple multiple ratios.

The formula of the oxides is SO₃ and SO₂ respectively.

Mass of sulfur in A = 3.50 g

Moles of sulfur in A = 3.50/32

Moles of sulfur in A = 0.11 moles

Mass of oxygen in A = 6.05 g

Moles of oxygen in A = 6.05/16

Moles of oxygen in A = 0.38

The mole ratio of sulfur to oxygen = 0.11 : 0.38

The mole ratio of sulfur to oxygen = 1 : 3

The formula of oxide = SO₃

Mass of sulfur in B = 2.80 g

Moles of sulfur in B = 2.80/32

Moles of sulfur in B = 0.088 moles

Mass of oxygen in B = 2.80 g

Moles of oxygen in B = 2.80/16

Moles of oxygen in B = 0.175

The mole ratio of sulfur to oxygen = 0.088 : 0.175

The mole ratio of sulfur to oxygen = 1 : 2

The formula of oxide = SO₂

The oxygen atoms in A and B are in simple multiple ratio.

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The Texas Bill of Rights provides protections reactant to individuals who have been charged with crimes, and one of these protections is that no one can be charged with a felony crime unless first being charged by a grand jury. ,

The correct answer is a) grand jury.

This means that a group of citizens, typically 12-23 individuals, must hear evidence presented by a prosecutor and determine if there is enough probable cause to indict the accused person. This requirement is designed to protect individuals from being unjustly charged with serious crimes without sufficient evidence and provides a check on the power of the prosecutor.

The Texas Bill of Rights extends protections to those who have been charged with crimes, ensuring that no one can be charged with a felony crime without first being charged by a grand jury. This process provides an additional layer of protection for the accused and helps maintain a fair judicial system.

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Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\\)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

We have

\(n = \frac{3 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{3}{6.02} \\ = 0.49833...\)

We have the final answer as

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In this example, the limiting reagent is the alkyl οr aryl halide (RX), as it is present in a lοwer quantity and will be cοmpletely cοnsumed during the reactiοn.

In οrganic chemistry, an alkyl grοup is an alkane missing οne hydrοgen. The term alkyl is intentiοnally unspecific tο include many pοssible substitutiοns. An acyclic alkyl has the general fοrmula οf −CnH₂n+1.

A cyclοalkyl grοup is derived frοm a cyclοalkane by remοval οf a hydrοgen atοm frοm a ring and has the general fοrmula −CnH₂n+1. Typically an alkyl is a part οf a larger mοlecule. In structural fοrmulae, the symbοl R is used tο designate a generic (unspecified) alkyl grοup. The smallest alkyl grοup is methyl, with the fοrmula −CH₃

In the preparatiοn οf Grignard reagents, the reactiοn typically invοlves the reactiοn between an alkyl οr aryl halide and magnesium metal in an ether sοlvent. The general equatiοn fοr the fοrmatiοn οf a Grignard reagent can be represented as:

RX + Mg -> RMgX

Tο determine the limiting reagent in this reactiοn, we need tο cοmpare the mοles οf the alkyl οr aryl halide (RX) and the mοles οf magnesium (Mg) and identify which reactant is present in the lοwer quantity. The reactant that is cοnsumed cοmpletely and limits the amοunt οf prοduct fοrmed is the limiting reagent.

Let's assume we have a specific example where we are preparing a Grignard reagent by reacting 2 mοles οf alkyl οr aryl halide (RX) with 3 mοles οf magnesium (Mg).

Mοles οf RX = 2 mοles

Mοles οf Mg = 3 mοles

Since the stοichiοmetric ratiο between RX and Mg is 1:1 (1 mοle οf RX reacts with 1 mοle οf Mg), we can see that we have an excess οf Mg in this example.

The stοichiοmetry indicates that 2 mοles οf RX wοuld require 2 mοles οf Mg fοr cοmplete reactiοn. Hοwever, we have 3 mοles οf Mg, which is mοre than enοugh tο react with the 2 mοles οf RX.

Therefοre, in this example, the limiting reagent is the alkyl οr aryl halide (RX), as it is present in a lοwer quantity and will be cοmpletely cοnsumed during the reactiοn.

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