Compare the drops of wax that harden in hot water and Cold water.

our chemistry lab. The chem 21 is a requirement for us. Basically, we were using a plate to chem lab it by one chemical to one.

Your Instructor has defined tolerances, which the Chem21 computer uses to score your response. This week's theme was about solving ten test tube mysteries. You will be informed on the website whether you are required to round your response chem lab to the correct number of Significant Figures; otherwise, you need just enter a number that lies between the correct amount minus

Here are some Chemistry Practical Class 12 experiments that will help students effectively prepare for their exams. I Making potash alum or ferrous ammonium sulphate double salt. Identifying a cation and an anion in a.

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The order of the elements in decreasing first ionization energy is He > Cl > H > Ca > Rb.

In physics and chemistry, ionization energy, ionization energy is the minimum energy required to remove the weakest bound electron from an isolated atom, positive ion, or molecule. The ionization energy of an atom, denoted Ei, is measured by finding the minimum energy of a light quantum (photon) or electron being accelerated to a known energy that would repel loosely bound atomic electrons. . Measurements are made in the gas phase on single atoms.

On the periodic table, the first ionization energy usually increases as you move from left to right over a period of time. This is because the increased nuclear charge causes the outermost electron to bind more strongly to the nucleus.

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The process of enzymes is called enzymatic action and the in terms of body it is known as digestion.

The response then occurs, changing the substrate into merchandise and forming an enzyme merchandise complicated. The merchandise then go away the energetic site of the enzyme. The first step of an enzyme catalyzed response is catalytic turnover the binding of substrate via way of means of the enzyme the discharge of product dissociation of the ES complicated ES -> E + P. An enzyme-catalyzed response may be more or less divided into 3 stages: enzyme-substrate binding, "catalysis" and product release.

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Depressed freezing point because the solute changed the solvent's molecular structure, causing it to refreeze at a lower temperature. More solute supplied generates a higher boiling point because the solute interacts with the solvent, requiring more energy to bring to a boil.

What is a pure solvent?

When mating surfaces are in close contact and no gap filling is necessary, pure solvents, which have just one component, are employed to affix thermoplastics.

Depressed freezing point because the solute changed the solvent's molecular structure, causing it to refreeze at a lower temperature. More solute supplied generates a higher boiling point because the solute interacts with the solvent, requiring more energy to bring to a boil.

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After that, the speeds of the molecules are calculated at the two different temperatures as given in the question and then, the ratio is calculated by dividing.

Here, T is the temperature,

         m is the mass of the molecules and

         R is the Gas constant.

Let's taken an example of the two temperatures are as follows:

[tex]T_{1}[/tex]=270K

[tex]T_{2}[/tex]=30K

We know that the root mean square speed of the molecules is given as:

 [tex]V_{rms} = \sqrt{\frac{3RT}{M} }[/tex]

Putting the values of the temperatures and calculating the root mean square speeds of the molecules:

[tex]V_{rms1} = \sqrt[]{\frac{3R*270}{M} }[/tex]

[tex]V_{rms2} = \sqrt{\frac{3R*30}{M} }[/tex]

Dividing the above two root mean square speed equations in order to get the ratio of the two, we get,

⇒ [tex]\frac{V_{rms1} }{V_{rms2} } = \frac{\sqrt{\frac{3R*270}{M} } }{\sqrt{\frac{3R*30}{M} } }[/tex]

⇒ [tex]\frac{V_{rms1} }{V_{rms2} } = \sqrt{\frac{9}{1} }[/tex]

⇒ [tex]\frac{V_{rms1} }{V_{rms2} } = \frac{3}{1}[/tex]

Hence, the ratio of the root mean square speeds of the molecules of an ideal gas at 270K and 30K is 3:1.

Note: It is important to note that the root-mean-square speed is the measure of the speed of particles in a gas, defined as the square root of the average velocity-squared of the molecules in a gas. The mass and the Gas constant values for a particular gas remain the same and only temperature is the variant.

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The simplest response is that atoms are attempting to enter the most stable (lowest-energy) state possible. When an atom meets the octet rule or forms chemical bonds, many of them become stable.

The attraction between two or more atoms that enables them to combine to produce a stable chemical compound is known as chemical bonding. Chemical bonds can have many different types, but covalent and ionic bonds are the most well-known. When one atom has less energy, the other has enough thanks to these bonds.

The valence electrons are the ones in charge of forming chemical bonds. Atoms trade electrons to form chemical bonds. Ionic and covalent bonds are the two basic types of bonding. When two atoms with different electronegativity join together, ionic connections are formed.

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Answer: Ozone

Explanation:

Ozone, O3, also known as Trioxygen, is a triatomic molecule consisting of three oxygen. Ozone is the allotrope, or behavior, of oxygen that is less stable than O2.

The first structure is ketotetrose.

The second structure is ketohexose.

The third structure is aldohexose.

Monosaccharides are the most fundamental form of sugar and are the monomers from which all other types of carbohydrates are produced. They are also frequently referred to as simple sugars. In addition to this, they are the most basic form of sugar. The majority of the time, these compounds have a crystalline form, are white in color, and are soluble in water. Despite their common name, monosaccharides are not all sugars. Only certain monosaccharides have a flavor that can be described as sweet. The structure of the great majority of monosaccharides can be represented mathematically as CnH₂nOn. disaccharides and polysaccharides are created from monosaccharides, which are the foundational building blocks of carbohydrates. Sucrose, most commonly referred to as table sugar, is a disaccharide.

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Answer:

UNsaturated

Explanation:

Eventually by adding solute you will reach a point where no more will dissolve....then it is saturated

The concentration of a solution which contains 16 gram of urea in 20 gram of solution is 80%.

Concentration in chemistry is a quantitative measure of the amount of solute in a given solution. It is usually expressed in terms of the amount of solute per unit volume of solution. It is commonly used to determine the amount of reactants or products in a reaction. It is also used to measure the amount of dissolved substances in a given sample, such as the amount of salt in seawater.
Urea is a non-volatile solute, meaning it does not evaporate when the solution is heated. Therefore, the concentration of the solution remains the same throughout the heating process.
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The Lewis structure is a simplified representation of the valence shell electrons in a molecule. It is used to show how electrons are arranged around individual atoms in a molecule. Electrons are shown as "dots" or to connect electrons as a line between two atoms.

1) Ethyl acetate: [tex]C_{4}H_{8}O_{2}[/tex]

Ethyl acetate is a widely used solvent, especially for paints, varnishes, lacquers, cleaning compounds, and perfumes. Like last week's MOTW, dichloromethane, is used as a solvent to reduce coffee grounds. In the laboratory, ethyl acetate is a common solvent for column and thin layer chromatography.

2. Acetaminophen:

Acetaminophen is an active ingredient in hundreds of over-the-counter (OTC) and prescription medications. It relieves pain and fever. Acetaminophen can also be combined with other active ingredients in medications that treat allergies, coughs, colds, flu, and insomnia. In prescription  acetaminophen is found along with other active ingredients to treat severe pain. Acetaminophen can cause serious liver damage if used more than prescribed. The FDA has taken action to improve consumer safety when using acetaminophen.

3) Phenacetin:

Phenacetin has been used as an analgesic and antipyretic in both human and veterinary medicine for many years. It was introduced in treatment in 1887 and was widely used in analgesic mixtures until it was included in kidney diseases (nephropathy) due to the abuse of analgesics. Phenacetin was also once used as a stabilizer for hydrogen peroxide in hair bleaching preparations.

4-Caffeine

Caffeine is a stimulant, which means it increases activity in your brain and nervous system. Caffeine also increases the circulation of chemicals in the body like cortisol and adrenaline. In small doses, caffeine can make you feel relaxed and focused.

5.Aspirin

Aspirin is a common medicine to relieve minor aches, pains, and fever. Also, people use it as an anti-inflammatory or blood thinner.

Aspirin can buy by people can buy  over the counter without a prescription. Daily benefits include relieving headaches, reducing inflammation, and reducing fever.

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2Al(OH)3 + 3H₂ →2AI + 6H₂O , 2 moles of Al(OH)3 give ,3 moles of H₂O. so, 100gm of  Al(OH)3 gives 300 gm of H₂O.

Endothermic chemical processes are those that generally absorb (or use) energy. When bonds in the reactants are broken in endothermic reactions, more energy is absorbed than is released when new bonds are created in the products.

Not applicable, (also known as N/A), is a written acronym for not applicable that is used on forms when you are unable to provide a relevant (i.e., answer the question) response. Related words and phrases are part of the SMART Vocabulary. undesirable and inappropriate. amiss.

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When sodium bicarbonate breaks down into sodium carbonate and water this reaction comes under the category of a chemical change.

Decomposition and pH are two common chemical properties of sodium bicarbonate. The pH tells us about the number of (H+) ions present in the compounds. It helps us to identify whether a given substance is acidic , basic or neutral in nature.

A chemical change happens when a reaction takes place , whereas a physical change happens when something changes shape but not its chemical properties.

Physical changes are reversible whereas chemical changes are irreversible. Example , melting of ice is physical change whereas burning of paper is chemical change.

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According to molar concentration, the molarity of  sucrose in the final solution is 0.0584 M.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.

Initially the molarity of sucrose is determined as, number of moles /volume of solution in liters which is 0.146/0.2=0.0292 moles and then molarity after dilution is determined as, M₁V₁=M₂V₂, on substitution M₂=0.0292×10/50=0.0584 M.

Thus, the molarity  of sucrose in this final solution is 0.0584 M.

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In the XeI₂ Lewis structure, a xenon atom displays a xenon atom in the center, surrounded by two iodine atoms. There are two single bonds connecting the xenon atom to each iodine atom. There are three lone pairs on the xenon atom and both iodine atoms.

Lewis's structure is a pattern or diagram that describes the number of valence electrons of the atoms that will form chemical bonds. The Lewis structure is also known as the electron dot formula.

Several stages of how to write a Lewis structure:

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Answer:

Explanation:

The equilibrium constant (K) for the reaction 2NH3 equilibrium N₂ + 3H2 is given as 6 × 104. This value indicates the relative concentrations of the reactants and products at equilibrium.

To determine the correct option among the choices given (a, b, c, or d), we need to know the concentration units of the equilibrium constant. Without this information, it is not possible to determine which of the given options is correct.

The equilibrium constant is usually expressed in terms of the concentration of the reactants and products in the reaction. For example, if the concentration units for the equilibrium constant are mol/L, then the correct option could be one of the following:

a. 1.12 × 10^3: This option has the correct units (mol/L) but the value is incorrect.

b. 1.67 * 10^5: This option has the correct units (mol/L) but the value is incorrect.

c. 1.51 × 10^-3: This option has the correct units (mol/L) but the value is incorrect.

d. 1.67 x 10^-5: This option has the correct units (mol/L) but the value is incorrect.

Without more information about the concentration units of the equilibrium constant, it is not possible to determine which of the given options is correct.

Answer:

The four (4) most important elements found in cells that form covalent bonds are carbon, hydrogen, oxygen and nitrogen.

Explanation:

The percent composition is calculated by dividing the mass of an atom by the total mass of the compound multiplied by 100.

percentage of atom= (mass of atom/molecular mass) X 100

The atomic weight of magnesium Mg is 24.3. The atomic weight of oxygen is 16.0.

The total mass is (24.3+16.0 = 40.3)

put values in formula to calculate percentage,

Percentage of magnesium= (24.3/40.3) X 100

Percentage of magnesium= 60.29%.

The percent composition of magnesium in magnesium oxide is 60.29 %.

molecular mass

Molecular mass of an element is defined as the sum of the masses of the elements present in the molecule.

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In the above intermediate chemical equation, oxygen will appear as follows: O₂(g) as a reactant (option B).

A chemical equation in chemistry is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.

According to this question, an intermediate chemical equation is presented as follows:

As observed in the above chemical equation, oxygen will react in its gaseous form i.e. as a reactant.

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There are four primary routes through which a chemical may enter the body:breathing (inhalation) (breathing)Contact with the skin or the eyes swallowing and injecting

Chemicals must reach your body in order to harm your health.The three basic "routes of exposure," or methods by which a chemical enters your body, are as follows.BREATHING

The method via which a person may come into touch with a dangerous material is referred to as an exposure pathway.There are three primary exposure routes: direct touch, ingestion, and inhalation.Measuring the quantity of the dangerous material just at point of contact allows for the determination of the degree and extent of exposure.

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The final product of the given series of reactions is shown in the attached diagram below.

In organic chemistry, hydroboration can be described as the addition of a hydrogen-boron bond to double and triple bonds involving carbon (C=C, C=O, and C≡C).

Hydroboration forms organoborane compounds that react with a variety of reagents to form useful compounds, such as alcohols, or alkyl halides. The mostly known reaction of the organoboranes is oxidation to form alcohols by hydrogen peroxide.

Hydroboration is typically anti-Markovnikov according to which the hydrogen adds to the most substituted carbon of the alkene bond. Hydroboration proceeds through a four-membered transition state where both B and H are added on the same face of the double bond. The plane through which they are added is generated less hindered face.

After the addition of Boron, we get OH after the oxidation of BH₂ with H₂O₂. PBr₃ is used for the conversion of OH into Br and then base NaOEt will give eliminating reaction so the final product is an alkene.

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HI is the Bronsted-Lowry acid and water is the Bronsted-Lowry base, it accepts the H⁺.

According to Bronsted Lowry theory:

Acid is the one that release a proton

Base is the one that accept a proton

HF is the acid, it donates the proton to water.

Water is the base, it accepts the H⁺

HI (aq)  +  H₂O(l)   →   H₃O⁺  (aq)   +   I⁻ (aq

HF is the acid, it donates the proton to water.

Water is the base, it accepts the H⁺

The Bronsted-Lowry hypothesis, sometimes known as the proton theory of acid and base, was devised by English chemist Thomas Martin Lowry and Swedish scientist Johannes Nicolaus Bronsted.

According to the theory, when an acid and a base react, the acid trades its proton for the base's conjugate base, and the base for the acid's conjugate proton.

The Bronsted-Lowry hypothesis is an enlarged version of the Arrhenius theory of acid-base.

The Arrhenius theory states that while base increases the concentration of OH- ions in an aqueous solution, acid increases the concentration of H+ ions.

The Arrhenius hypothesis' disadvantage is that it can only be used to identify an acid-base interaction in an aqueous medium.

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The value of density in kg/m³ is equal to 0.00088 kg/m³.

The metric system can be demonstrated as a system of measurement that is composed after the decimalized system based on the meter.  Each of the fundamental dimensions can be represented by a single base unit of measurement.

For parameters derived from the base units of the system, units derived from the base units can be used such as the square meter being the derived unit for the area, a parameter derived from length.

Metric units can be defined as units based on the gram, meter, or second and decimal multiples.

Given the density in the unit of g/cm³.

Density = 0.0088 g/cm³

We know that 1 Kg = 1000 g

⇒ 1 g = 10⁻³ Kg

We know that 1 m = 100cm

1 cm = 10⁻² m

Therefore, Density = 0.0088 × 10⁻³Kg/10⁻² m³

Density = 0.00088 kg/m³

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The pH of the strong acid /strong base for different volumes are 1.00,1.51,7,12.523.

What is pH?

Water's pH level indicates how acidic or basic it is. The range is 0 to 14, with 7 acting as a neutral value. A pH of greater than 7 denotes a base, while one of less than 7 suggests acidity. The pH scale really measures the proportion of free hydrogen and hydroxyl ions in a solution.

Using the concept of titration we can calculate pH for each volumes.

Using pW=pH+pOH

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To design a synthesis of acetophenone from benzyl alcohol and methanolBenzyl alcohol is converted to Benzaldehyde using PCC. Mean while methanol was converted to methyl bromide and Generated Grignard reagent.

Benzaldehyde react with Grignard reagent to give secondary alcohol which is oxidized to Acetophenone by PCC.benzaldehyde and methylmagnesium bromide are the appropriate starting material for AcetophenoneMethanol, the most basic alcohol (CH3OH), is a chemical key component in hundreds of everyday items such as plastics, paints, automobile parts, and building supplies. Methanol is also a clean energy source of information that is used to power cars, trucks, buses, ships, fuel cells, boilers, and cook stoves. . Chronic methanol vapour poisoning can cause eye inflammation (conjunctivitis), recurrent cramps, giddiness, insomnia, stomach disruptions, and visual failure.

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The % mass of copper in your product will be 3.93 %.

Calculated slope = 64.52

Mass of copper product = 0.059 g

Initial volume (V1) = 25 ml

Final volume (V2) = 100 ml

Absorbance (A) = 0.374

% mass of copper = ?

To find out the concentration (C) we use the following equation

C = A / slope

Put the values

C (M2) = 0.374 / 64.52

C (M2) = 0.005797 g/L

To calculate M1 we use the following equation.

M1V1 = M2V2

M1 = 0.005797 * 100 ml / 25 ml

M1 = 0.0232 g/L

mass of copper = Penny solution x Volume

mass of copper  = 0.0232 g/L x 0.1 L

mass of copper = 0.00232 g

% mass of copper = (total mass of copper ÷ mass of penny) x 100

% mass of copper = (0.00232/ 0.059 ) x 100

% mass of copper = 3.93 %

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Dangerous pathogens won't be reduced sufficiently without sanitizer. A surplus could be harmful.

Sanitizers are substances that have the ability to eradicate microorganisms, including the bacteria responsible for food poisoning and other diseases. When used properly, they can reduce the number of bacteria on surfaces to a safe level.

Concentrations higher than necessary can be hazardous, detrimental to flavour and odour, corrosive to metals and other materials, and residue-producing. Over time, a chlorine bleach sanitising solution starts to lose part of its effectiveness.

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Answer:(a)(i) Y is Conc. H2SO4, Z is HCl(g) or hydrogen chloride

(ii) Acidify a solution of X with dilute HNO3 and add AgNO3(aq). White ppt. soluble in aqueous ammonia confirms the presence of chloride. E.g. add solution of X to Pb2+ solution to get a white ppt. soluble when hot, reappearing on cooing.

Explanation: