What is racemix mixture, also known as racemization, in chemistry?

We require these compounds to migrate up the plate in order to provide a better separation of them. We will need to make the eluting solvent more polar in order to do this. Ethyl acetate could be substituted with a more polar solvent, such as acetone, as a possible remedy.

Non-volatile mixtures can be separated using the chromatography technique known as thin-layer chromatography (TLC).

A sheet of an inert substrate, such as glass, plastic, or aluminum foil, is used for thin-layer chromatography. This substrate is coated with a thin layer of an adsorbent material, typically silica gel, aluminum oxide (alumina), or cellulose. The stationary phase refers to this adsorbent layer. A solvent or solvent combination (referred to as the mobile phase) is dragged up the plate by capillary action after the sample has been placed on the plate. Separation is accomplished because various analytes ascend the TLC plate at various speeds.

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Answer:

Option 4 is the correct answer

A Ball-and-stick Model

Explanation:

The given diagram shows the model of A Ball And Stick Model.

As you can see these are balls and they are connected with those sticks.

Answer:

3.

a.climate

4.

c.average measurements of temperature and rainfall over many years

Answer:

110L

Explanation:

The following data were obtained from the question:

Initial volume (V1) = 44L

Initial temperature (T1) = 200K

Final temperature (T2) = 500K

Final volume (V2) =..?

The new volume of the balloon can be obtained by using Charles' law equation as shown below:

V1/T1 = V2/T2

44/200 = V2/500

Cross multiply

200 x V2 = 44 x 500

Divide both side by 200

V2 = 44 x 500/200

V2 = 110L

Therefore, the new volume of the balloon is 110L

Answer:

galing ah spanish kami pinoy

Answer:

HC2H3O2

Explanation:

Acetic acid is a colorless organic compound liquid called ethanoic acid. It has molar mass of 60.052 g/mol. It is soluble in water. Its formula is CH3COOH. If water is combined with HC2H3O2 then it will give rise to acetic acid solution. When acetic acid is combined with water it creates hydronium and acetate ions.

generally speaking, the Bohr model encapsulates the modern understanding of the atom. This model is often depicted in artwork showing a central atomic nucleus and oval lines representing the orbits of the electrons.

Bohr

Answer:

71.92 kPa

Explanation:

Using the combined gas law equation;

P1V1/T1 = P2V2/T2

Where;

P1 = initial pressure (kPa)

P2 = final pressure (kPa)

V1 = initial volume (L)

V2 = final volume (L)

T1 = initial temperature (K)

T2 = final temperature (K)

According to the information provided in this question;

T1 = 50°C = 50 + 273 = 323K

V1 = 105L

T2 = -25°C = -25 + 273 = 248K

P2 = 105.4 kPa

P1 = ?

V2 = 55.0 L

Using P1V1/T1 = P2V2/T2

P1 × 105/323 = 105.4 × 55/248

105P1/323 = 5797/248

0.325P1 = 23.375

P1 = 23.375 ÷ 0.325

P1 = 71.92 kPa

One pound of dry air and its associated moisture at standard conditions has a pressure of 29.92 inHg.

The pressure at standard conditions, also known as standard atmospheric pressure, is defined as 29.92 inHg (inches of mercury). This value represents the average atmospheric pressure at sea level on Earth.

When air contains moisture, it is referred to as humid air. The pressure of humid air is typically measured in relation to the pressure of dry air alone. In this context, the pressure of one pound of dry air and its associated moisture at standard conditions is still 29.92 inHg.

The given answer of 29.92 inHg is the correct value for the pressure of one pound of dry air and its associated moisture at standard conditions. This value is commonly used as a reference point for pressure measurements in various fields such as meteorology and engineering.

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The device that requires electrical energy to produce a chemical change is an electrolytic cell. Option 1 is correct.

An electrolytic cell uses electrical energy from an external power source, such as a battery or power supply, to drive a non-spontaneous chemical reaction. This process involves the movement of ions in a solution, where positively charged ions (cations) are attracted to the negative electrode (cathode) and negatively charged ions (anions) are attracted to the positive electrode (anode). The electrical energy from the power source provides the necessary energy to overcome the activation energy required for the reaction to occur.

In contrast, a voltaic cell (option 3) produces electrical energy from a spontaneous chemical reaction. A salt bridge (option 2) is used in both voltaic and electrolytic cells to maintain electrical neutrality and allow for ion flow, but it does not require electrical energy to produce a chemical change. A voltmeter (option 4) is used to measure the potential difference (voltage) between two electrodes and does not produce a chemical change. Hence, option 1 is correct.

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Answer:

Destiny = 5 g/ml

Explanation:

The formula for density is d=

Knowing this, divide your mass by volume:

10 g / 2 ml = 5 g/ml

Final answer:

Destiny = 5 g/ml

Out of propane and oxygen, oxygen is the limiting reagent.19.25 moles of oxygen reacts with 3 moles of carbon dioxide.So, 5 moles of oxygen reacts with 3/19.25 × 5 = 0.77 moles of carbon dioxide. Hence, 33.88 grams of carbon dioxide are produced.

Given that the balanced chemical equation is:C3H8 + 5O2 3CO2 + 4H2O3.85 mol of propane reacts with 20.0 mol of oxygen.

According to the balanced chemical equation, 1 mole of propane reacts with 5 moles of oxygen. Hence, 3.85 moles of propane reacts with 5 × 3.85 = 19.25 moles of oxygen.

Therefore, oxygen is the limiting reagent.19.25 moles of oxygen reacts with 3 moles of carbon dioxide.

So, 5 moles of oxygen reacts with 3/19.25 × 5 = 0.77 moles of carbon dioxide.

The molar mass of carbon dioxide is 44 g/mol.So, the mass of 0.77 moles of carbon dioxide is:44 × 0.77 = 33.88 g of CO2.

Hence, 33.88 grams of carbon dioxide are produced.

:Therefore, 33.88 grams of carbon dioxide are produced.

From the given balanced chemical equation, it is inferred that 3.85 moles of propane reacts with 20.0 mol of oxygen. Out of propane and oxygen, oxygen is the limiting reagent.19.25 moles of oxygen reacts with 3 moles of carbon dioxide.So, 5 moles of oxygen reacts with 3/19.25 × 5 = 0.77 moles of carbon dioxide. Hence, 33.88 grams of carbon dioxide are produced.

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Answer:

2 g/cm3

Explanation:

Density is a measure of a substance's mass over its volume.

d = m/v

Therefore d = 60g/30cm3 = 2 g/cm3

Answer:

use this formula it will help u .

Explanation:

If 60 ml of ethanol is diluted to a final volume of 400 ml, you create a 35 % ethanol solution.

First, realize that you creating a solution with that contains a polar solute (ethanol) with a polar solvent (water). Remember that "like dissolves like."

If you pour 60 ml of ethanol in a volumetric flask, you add 340 ml of water to dilute this solution to a final volume of 400 ml.

Volumetric flasks are designed to make or dilute solutions to specified final volume.

Since you have 60 ml of ethanol in a total solution of 400 ml, the percentage of ethanol is 35 %.

This result is obtained in the following manner.

ml/400. ml. = .35

.35 x 100% = 35 %

Answer: C

Explanation: Because I just did the test lol.

Chemicals are substances that can be natural or man-made. It can both hurt and help the environment as they pollute water and can also clean water. Thus, option C is correct.

Chemicals are compounds that are synthesized artificially and have various uses and applications in various fields. They can be both beneficial and detrimental to the environment and the ecosystem.

Chemicals like that from factories, pesticides run-off from agricultural fields, drugs, microorganisms, fertilizers, radioactive substances, etc, cause water pollution by acting as contaminants.

On the contrary, chemicals can be used to clean water pollution. Chloramine and chlorine are the most common chemical disinfectants that cleanse contaminated water to make it useful.

Therefore, option C. chemicals can both clean and pollute water.

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In a face-centered cubic (FCC) lattice, each unit cell has 8 corner atoms and 1 center atom. Thus, a unit cell of a FCC lattice of copper would contain 8 corner copper atoms and 1 center copper atom, giving a total of 8 + 1 = 9 copper atoms in the unit cell.

In a face-centered cubic (FCC) lattice of copper, the unit cell is made up of 8 corner atoms and a single atom in the center. Each corner atom of the unit cell is shared with 8 other unit cells and the center atom is shared with a total of 8 unit cells. Therefore, the number of copper atoms in a unit cell of an FCC lattice of copper is 8 corner atoms + 1 center atom = 9 atoms. This is a basic characteristic of FCC structures, which are very commonly found in metals and are known for their high packing efficiency and close-packed arrangement of atoms.

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Answer:

To reduce the bending of the railway

Explanation:

During summer(heat) metals tend to expand in size. The skits/gaps are present in the railway so that the metal could expand without causing bending of the railway track.

Without knowing the specific reactants and conditions of the reactions you are considering, it is not possible for me to accurately predict the type of substitution mechanism or compare the expected rates of the reactions.

In general, the type of substitution mechanism that occurs in a given reaction depends on a variety of factors, including the nature of the reactants, the solvent, and the temperature and concentration of the reactants. The rate of a reaction can also be influenced by these factors, as well as by the presence of catalysts or other substances that may affect the rate of the reaction.

To identify the mechanism of each reaction and compare the rates of the reactions, you would need to consider these factors and use information about the reactants and conditions of the reactions to make predictions about the mechanisms and rates. You could then use this information to draw the organic products of the reactions and compare the expected rates.

Answer: Percent yield represents the ratio between what is experimentally obtained and what is theoretically calculated, multiplied by 100%.

% yield

=

actual yield

theoretical yield

⋅

100

%

So, let's say you want to do an experiment in the lab. You want to measure how much water is produced when 12.0 g of glucose (

C

6

H

12

O

6

) is burned with enough oxygen.

C

6

H

12

O

6

+

6

O

2

→

6

C

O

2

+

6

H

2

O

Since you have a

1

:

6

mole ratio between glucose and water, you can determine how much water you would get by

12.0

g glucose

⋅

1 mole glucose

180.0 g

⋅

6 moles of water

1 mole glucose

⋅

18.0 g

1 mole water

=

7.20

g

This represents your theoretical yield. If the percent yield is 100%, the actual yield will be equal to the theoretical yield. However, after you do the experiment you discover that only 6.50 g of water were produced.

Since less than what was calculated was actually produced, it means that the reaction's percent yield must be smaller than 100%. This is confirmed by

% yield

=

6.50 g

7.20 g

⋅

100

%

=

90.3

%

You can backtrack from here and find out how much glucose reacted

65.0 g of water

⋅

1 mole

18.0 g

⋅

1 mole glucose

6 moles water

⋅

180.0 g

1 mole glucose

=

10.8

g

So not all the glucose reacted, which means that oxygen was not sufficient for the reaction - it acted as a limiting reagent.

Explanation:

For the combustion of propane \(C_{3}H_{8}\), 164 grams of oxygen is needed to fully react 45.0 grams of propane.

We know that,

The combustion of propane is as follows:-

\(C_{3}H_{8}+5O_{2}\) → \(3CO_{2}+4H_{2}O\)

Hence, for 1 mole of propane 5 moles of \(O_{2}\) are needed.

We know that,

Mass of 1 mole of propane = 12*3 + 1*8 = 36+8 = 44g

Hence,

45g of propane = 45/44 moles of propane = 1.022 moles.

Hence,

1.022 moles of propane will need 5*1.022 = 5.11 moles of \(O_{2}\).

1 mole of \(O_{2}\) = 2*16 = 32g

5.11 moles of \(O_{2}\) = 32*5.11 = 163.52g ≈ 164g \(C_{3}H_{8}\), 164 grams of oxygen are needed to fully react 45.0 grams of propane.

We know that,

The combustion of propane is as follows:-

\(C_{3}H_{8}+5O_{2}\) → \(3CO_{2}+4H_{2}O\)

Hence, for 1 mole of propane 5 moles of \(O_{2}\) are needed.

We know that,

Mass of 1 mole of propane = 12*3 + 1*8 = 36+8 = 44g

Hence,

45g of propane = 45/44 moles of propane = 1.022 moles.

Hence,

1.022 moles of propane will need 5*1.022 = 5.11 moles of \(O_{2}\).

1 mole of \(O_{2}\) = 2*16 = 32g

5.11 moles of \(O_{2}\) = 32*5.11 = 163.52g ≈ 164 grams.

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Explanation:

Sodium chloride: 36 g/100g

Sugar (sucrose): 2000 g/100g

Carbon dioxide: 0.2 g/100g

Naphthalene: 31 mg/100g

Potassium iodide: 50 g/100g

Magnesium oxide: 0.0086 g/100g

True. Every living thing is given a scientific name that is made up of two words, the genus and the species. However, as mentioned in the question, the naming system of living organisms goes beyond the genus and species level to include domain, kingdom, phylum, class, order, family, and genus.

Each organism's scientific name, also known as its binomial nomenclature, uses the genus and species names to classify it. However, beyond this level, organisms are classified based on additional criteria such as cell type, body symmetry, habitat, etc.

For example, the classification of a human is as follows:Domain: EukaryaKingdom: AnimaliaPhylum: ChordataClass: MammaliaOrder: PrimatesFamily: HominidaeGenus: HomoSpecies: sapiensTherefore, it is true that all living things are classified with a name made up of three Greek words using their domain, class, and phylum.

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There are three kinds of Hydrogen in  2-methyl-2-butene

The correct question is

How many kinds of  hydrogen atoms are present in 2-methyl-2-butene

Atom was discovered by Dalton's Atomic theory , he predicted that each element consist of large number of a very small thing known as atom.

In the structure of 2-methyl-2-butene there are 3 types oh Hydrogen

1. Attached to the Carbon atom connecting the methyl ion to the butene

2. Connected to the last Carbon atom

3. Connected to the Carbon bond having double bond.

Therefore there are three kinds of Hydrogen in  2-methyl-2-butene.

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The material that has the largest increase in temperature is B) Cadmium.

The amount of energy required to raise the temperature of one gram of  material by one degree Celsius is called as specific heat capacity. The formula for the change in temperature of a material is ΔT = ΔQ / (m × c)

ΔT is change in temperature, ΔQ is amount of energy added, m is mass of the material, and c is specific heat capacity of the material.

The specific heat capacities of the four materials are:

Iron: 0.45 J/(g°C)

Cadmium: 0.23 J/(g°C)

Silver: 0.24 J/(g°C)

Copper: 0.39 J/(g°C)

ΔT_iron = 100 J / (10.0 g × 0.45 J/(g°C)) = 22.2°C

ΔT_cadmium = 100 J / (10.0 g × 0.23 J/(g°C)) = 43.5°C

ΔT_silver = 100 J / (10.0 g × 0.24 J/(g°C)) = 41.7°C

ΔT_copper = 100 J / (10.0 g × 0.39 J/(g°C)) = 25.6°C

Therefore, material with the largest increase in temperature is Cadmium, with a temperature increase of 43.5°C.

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Answer:

Iron Correct on Acellus

Explanation:

Answer:

Using the formula cards again, add the coefficient of 2 in front of the formula and have them recalculate the number of each element and the total number of atoms in each element.

Explanation:

The number of elements in a compound is counted by identifying and counting the chemical symbols represented in the chemical formula

A compound is a substance that is a mixture of more than one elements.

Compounds are made of two or more elements. These elements are represented by their symbols. These symbols can be identified and the number of elements represented by these symbols are counted.

For example, in the compound \(H_2O\):

H represents Hydrogen

O represents Oxygen

The elements in Water ( \(H_2O\)) are Hydrogen and Oxygen

Therefore, the number of elements in  \(H_2O\) is 2

Also in, \(NaCl\)

The elements are Sodium(Na) and Chlorine(Cl)

There are two elements in NaCl

Hence, the number of elements in a compound is counted by identifying and counting the chemical symbols represented in the chemical formula

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In an ionic salt where the anion is relatively large compared to the size of its cation, the cation is typically arranged in a close-packed array.

This arrangement allows for efficient packing of the smaller cations around the larger anions, maximizing the attractive electrostatic interactions between them.

Close-packed arrays are characterized by the arrangement of spheres in a way that maximizes the packing density.

The two common types of close-packed structures are face-centered cubic (FCC) and hexagonal close-packed (HCP). In both structures, the spheres are arranged in layers, and each sphere is surrounded by its nearest neighbors.

In the case of an ionic salt with a large anion and a smaller cation, the cation will fit better within the interstitial spaces between the anions.

This allows the cations to form a close-packed arrangement around the anions, maximizing the efficiency of the packing.

Therefore, the cation is typically arranged in a close-packed array.

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Nine, with each coupled pair of monomers requiring the hydrolysis of one water.

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Answer:

The Percentage concentration of acetic acid = 1.39 %

Explanation:

Density of acetic acid solution = 1.05 g/mL

Volume of acetic acid solution = 0.1 L = 100 mL

From the formula, Density = mass / volume; mass = density × volume

Mass of acetic acid solution = 1.05 g/mL × 100 mL = 105 g

Molar concentration of acetic acid solution = 0.243 mol/L

Molar mass of acetic acid, CH₃COOH = (12 × 2 + 1 ×4 + 16 ×2) = 60 g/mol

From the formula, mass concentration = molar concentration × molar mass

Mass concentration of acetic acid, CH₃COOH = 0.243 mol/L × 60 g/mol = 14.58 g/L

In one liter of acetic acid solution, there are 14.58 g of acetic acid. Therefore, in 0.1 L, there will be 14.58 × 0.1 = 1.458 g of acetic acid.

Percentage concentration of acetic acid = mass of acetic acid / mass of acetic acid solution × 100%

Percentage concentration of acetic acid = (1.458 / 105) × 100% = 1.39 %

The Percentage concentration of acetic acid = 1.39 %