Answer:
Jagdish is 3 years younger than Resham and Rajesh is 5 years older than Jagdish. If the product of present age of Resham and Rajesh is 960.How old is Jagdish
In a spectrophotometer, both absorbance and transmítanse indicate _____________ passing through a sample. A high absorbance corresponds to a _________ transmittance.
In a spectrophotometer, both absorbance and transmítanse indicate the amount of light passing through a sample. A high absorbance corresponds to a low transmittance.
what is spectrophotometer?A spectrophotometer is an instrument used to measure the intensity of light as a function of its color (wavelength). It is commonly used in chemistry to measure the concentration of a compound in solution, or to measure the purity of a substance. Spectrophotometers can also be used to measure the reflectance of a material, such as paint or ink, or to analyze the optical properties of a material, such as its transmission or absorption of light.
Therefore, In a spectrophotometer, both absorbance and transmitanse indicate the amount of light passing through a sample. A high absorbance corresponds to a low transmittance.
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How many molecules are there in 24 grams of FeF_3?
1.2 × 10²³ molecules are there in 24 grams of FeF₃ molecule. 1 mole is equal to 6.023 × 10²³ particles.
What do you mean by mole ?A mole is a important unit of measurement that chemists use in calculation. 1 mole is exactly equal to the 6.023 × 10²³ particles.
The term mole is defined as the amount of substance containing 6.023 × 10²³ molecules.
First multiply the number of moles supplied by Avogadro's Number to detect how many molecules there are.
Moles are determined from the molecular weight.
For FeF₃ molecule,
55.8 + 3⋅19 = 116g/mole
24 gram / 116g/mole
= 0.207 moles of FeF₃
= 0.207 moles × 6.023 × 10²³
= 1.2 × 10²³ molecules
Thus, in 24 grams of FeF₃ molecule 1.2 × 10²³ molecules are present.
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How does iodine test for starch?
Iodine test for starch is " A blue-black color results if starch is present. If starch amylose is not present, then the color will stay orange or yellow.
Put Iodine-KI reagent to a solution or straight onto potatoes or other items like bread, crackers, or flour for the starch test. an an an an a-colored an an an an an an an an a The colour will remain orange or yellow if starch amylose is absent. The colour is not produced by cellulose, starch amylopectin, or disaccharides like sucrose in sugar.
Iodine Test: Iodine may be used as an indicator to track variations in iodide ions and iodine elements while observing changes in several inorganic oxidation reduction reactions. The addition of soluble starch solution. Only the iodine element will provide the distinctive blue-black colour when iodide ions are present. Neither the iodine element nor the iodide ions by themselves will provide the desired hue.
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a bond between carbon and oxygen, c-o, would most likely have which type of force?
The bond between carbon and oxygen in a molecule such as carbon monoxide (CO) is a covalent bond. Covalent bonds are formed when two atoms share a pair of electrons, and the resulting bond is typically quite strong. In the case of CO, the carbon and oxygen atoms share a pair of electrons to form a double bond, which consists of two covalent bonds.
The force that holds the carbon and oxygen atoms together in this covalent bond is an electrostatic force of attraction between the positively charged atomic nuclei and the negatively charged shared electrons. This force is typically referred to as a covalent bond force, and it is one of the strongest types of chemical bonds.
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particles of electromagnetic radiation are called ______, and each has a discrete amount of energy called a ______. since electromagnetic radiation also has wave properties, each particle is also characterized by a specific ______ and frequency.
particles of electromagnetic radiation are called photons, and each has a discrete amount of energy called a photon. since electromagnetic radiation also has wave properties, each particle is also characterized by a specific wavelength and frequency.
What is photon?
A photon is a particle of light that is created when an atom releases energy. It is the smallest unit of light, and it is the basic unit of all forms of electromagnetic radiation, including visible light, infrared, ultraviolet, and X-rays. Photons travel in waves, and can also be used to carry information.
Therefore, particles of electromagnetic radiation are called photons, and each has a discrete amount of energy called a photon. since electromagnetic radiation also has wave properties, each particle is also characterized by a specific wavelength and frequency.
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Can a chemical name be used as a chemical identifier?
Chemical names, also known as systematic or IUPAC (International Union of Pure and Applied Chemistry) names, can provide detailed information about the structure and composition of a chemical substance, but they are not typically used as the sole identifier for a chemical.
Instead, chemicals are usually identified and tracked using unique identifiers such as CAS (Chemical Abstracts Service) numbers, which are assigned by the American Chemical Society, or EC (European Chemical) numbers, which are assigned by the European Chemicals Agency.
These identifiers provide a simple and consistent way of identifying chemicals, and can be used to access information such as properties, uses, and regulatory status.
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What is chemical - part 1?
A chemical is a substance that has a specific composition and a set of specific properties. It is composed of atoms, which are the building blocks of matter.
Chemicals can be found in a variety of forms, including solids, liquids, and gases. They can be natural or man-made, and they can be used for a variety of purposes, including as ingredients in products, as fuels, and as medicines.
Chemicals are categorized based on their properties, which can include their reactivity, toxicity, and flammability. Some chemicals are hazardous and require special handling and disposal, while others are relatively safe to use.
It is important to understand the properties and potential hazards of chemicals in order to use them safely and responsibly. This can include reading labels and safety data sheets, following safety procedures, and wearing appropriate personal protective equipment.
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Describe reaction diene and dienophile would react to give the following Diels-Alder product?
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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What is van t hoff equation?
Van't Hoff general equation is given as −ΔG° = RT logKp.
Generally, the Van't Hoff factor can be basically defined as the ratio of the concentration of particles formed when a substance is dissolved to the concentration of the substance by mass. Van't Hoff factor is described as the extent to which a substance associates or dissociates in a solution.
The Van't Hoff equation generally gives the relationship between the standard gibbs free energy change and the equilibrium constant. Van't Hoff factor is represented by the equation −ΔG° = RT logKp.
Van't Hoff equation can also be written as `piV=nRT` where n is the no. of moles of solute present in V litres of solution, `pi` is the osmotic pressure, T is temperature and R is gas constant or solution constant.
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Reaction(s) released heat.
Reaction released the most heat per mole of reactant.
Answer:
1,2,and 3
1
Explanation:
right on edge
State any exceptions to the octet rule
Exceptions to the octet rule - Molecules, such as NO, with an odd number of electrons;
Molecules in which one or more atoms possess more than eight electrons, such as [tex]SF_{6}[/tex]; and
Molecules such as [tex]BF_{3}[/tex], in which one or more atoms possess less than eight electrons.
Common exceptions to the octet rule are molecules with an odd number of electrons and molecules in which one or more atoms contain more or less than eight electrons. Molecules with an odd number of electrons are relatively rare in the s- and p-blocks, but very common among the d- and f-block elements.
Compounds with more than an octet of electrons around an atom are called extended valence molecules. One model to explain their existence uses one or more d orbitals in the bond in addition to the valence ns and np orbitals. Such species are known only for atoms of period 3 or lower that contain an nth subshell in their valence shell. The learning objective is to determine the Lewis dot symbol for elements whose compounds do not have an octet of electrons.
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after adding ____________ sodium ions a solid precipitate is first observed.
After adding sodium hydroxide, sodium ions a solid precipitate is first observed.
In an aqueous solution, precipitation is the most common way of changing a broke down substance into an insoluble strong from a super-immersed solution. The strong framed is known as the precipitate. In the event of an inorganic compound response prompting precipitation, the synthetic reagent making the strong structure is known as the precipitant.
The unmistakable fluid excess over the accelerated or the centrifuged strong stage is additionally called the 'supernate' or 'supernatant'.
The notion of precipitation can likewise be reached out to different spaces of science (natural science and organic chemistry) and, surprisingly, be applied to the strong stages (e.g., metallurgy and composites) when strong debasements isolate from a strong stage.
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condensation on a cup
When the molecules of water vapor present in the air come into touch with anything cool, including such the exterior of a cold cup they slow down and even get closer together.
What is condensation?Condensation is indeed the reverse of vaporization in that it changes the state of matter from either the gas phase to the liquid phase. The water cycle is the most commonly used term.
Deposition is a transformation that occurs when a gaseous phase immediately transitions into a solid phase. When the molecules of water vapor present in the air come into touch with anything cool, including such the exterior of a cold cup they slow down and even get closer together.
Therefore, when the molecules of water vapor present in the air come into touch with anything cool, including such the exterior of a cold cup they slow down and even get closer together.
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Your question is incomplete but most probably your full question was,
What causes condensation on a cup of ice water?
the α helix and β pleated sheet are examples of which level of protein structure?
The beta sheet, or "sheet," is a characteristic motif of the typical protein secondary structure. It is also referred to as the "pleated sheet," or "sheet."
What type of interaction holds α helices and β pleated sheets together?Most proteins contain two common structural motifs: the right-handed alpha helix and the beta-pleated sheet. The amino acid backbone's carbonyl oxygen and amine form a hydrogen bond, which keeps them joined.
The beta sheet, or "sheet," (also known as the "pleated sheet," or "sheet"), is a typical motif of the normal protein secondary structure. The building blocks of beta sheets are beta strands (-strands), which are joined laterally by at least two or three backbone hydrogen bonds and result in sheets that are typically twisted and pleated.
Helixes and pleated sheets are the most typical forms of secondary structures. Between the carbonyl O of one amino acid and the amino H of another, hydrogen bonds occur, keeping both structures in place.
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Select all the attractive forces associated with solidNaCl salt. a. Ion-dipole b. H-bonding c. London Disperson d. Dipole-dipole
e. lonic bonding
The attractive forces associated with solid NaCl salt is Ion-dipole. Thus, a is the correct option.
Sodium chloride is an inorganic salt with ionic forces inbetween the sodium cation and the chloride anion, which makes these intramolecular forces.
Oppositely-charged ions form molecules due to the electrostatic attraction between these ions. Ions are formed when a species either loses or gains electrons to form a negatively-charged ion (i.e, anion) or positively-charged ion (i.e, cation), respectively.
The contact between a Na+ ion and water (H2O) is an example of an ion-dipole interaction because the oxygen atom and sodium ion are attracted to one another while the sodium and hydrogen are repelled by one another.
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select the properties of the sn2 reaction mechanism.
The SN2 reaction mechanism (substitution nucleophilic bimolecular) is a type of reaction that occurs between a nucleophile and a substrate molecule.
Bimolecular is the reaction rate is proportional to the concentration of both the substrate and the nucleophile, indicating that the reaction is bimolecular. Nucleophilic is the reaction involves a nucleophile attacking the substrate molecule, hence the name "nucleophilic substitution."
Concerted is the reaction occurs in a single, concerted step, where the nucleophile and substrate form a transition state, which then collapses into the product.
These properties of the SN2 mechanism make it a valuable tool for understanding the behavior of nucleophiles in chemical reactions, and they provide important criteria for predicting the outcome of reactions and the stereochemistry of the products.
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A 100 g block of a substance requires 0.5 kJ of heat to raise its temperature from 25.0°C to 63.5°C. What is the substance?
A. gold
B. copper
C. iron
D. aluminum
The material is gold.
What is the specific heat capacity?The specific heat capacity, also known as simply specific heat, is the amount of heat energy required to raise the temperature of a substance by one unit, usually per unit of mass. It is typically denoted by the symbol "c" and has units of J/kg°C (joules per kilogram per degree Celsius) or J/mol°C (joules per mole per degree Celsius).
H = mc dT
m = mass
c = specific heat capacity
dT = temperature change
c = H/mdT
c = 0.5 * 10^3/100 (63.5 - 25)
c = 0.126
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The introduction of rabbits to Australia's ecosystem has had a Choose... Choose... neutral positive negative impact.
it is a positive affect to australia
Describe Lavoisiers experiment with mercury. How does this experiment show the law of conservation of mass?
During 1700s, Lavoisier demonstrated through trial and error method that the total mass of reactant and mass of product remains same during the experiment.
In the last part of the 1700s, Lavoisier demonstrated through trial and error that the total mass doesn't change in a chemical reaction, driving him to proclaim that matter is constantly preserved in a compound response.Lavoisier's experiment denoted whenever somebody first obviously tried this thought of the conservation of issue by estimating the majority of materials both when they went through a compound response.
At last, the disclosure of the law of conservation of mass was enormously influential for the field of science since it demonstrated that matter wasn't just vanishing (as it had all the earmarks of being) yet was somewhat changing structure into one more substance of equivalent mass.
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In the haber process for the production of ammonia, what is the relationship between the rate of production of ammonia and the rate of consumption of hydrogen? n2(g) + 3 h2(g) 2 nh3(g).
In the Haber process, the rate of ammonia production is directly proportional to the rate of hydrogen consumption.
Ammonia is produced through the Haber process when nitrogen and hydrogen react. The concentrations of the reactants determine the rate of the reaction, and the rate of ammonia production is directly proportional to the rate of hydrogen consumption.
To put it another way, more ammonia is made when more hydrogen is used up. This is due to the fact that in order for the reaction between nitrogen and hydrogen to produce the ammonia product, there must be two molecules of hydrogen for every molecule of nitrogen. As a result, the amount of ammonia produced rises in tandem with the amount of hydrogen used. This is due to the fact that product molecules are being made at a faster rate while reactant molecules are being used up at the same rate.
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a chemical equation is a statement using chemical that expresses both the identities and the relative of the reactants and products involved in a chemical or physical change. (True or False)
An expression that uses chemicals to express the identities and relationships of the reactants and products involved in a chemical or physical process is known as a chemical equation. the statement is False.
What is a chemical equation?In these equations, chemical reactions are represented by chemical formulae and symbols. Chemical equations have two sides: the reactants are on the left, and the products are on the right. In chemical equations, a chemical reaction is symbolically represented using chemical formulas and symbols. The process or change in chemistry is symbolically represented by a chemical equation. An example chemical equation is labeled in the following diagram based on the elements it contains. Reactants are the species on the left of the right-pointing arrow, while products are the species on the right. Chemical equations are symbolic representations of chemical reactions in the form of symbols and formulae, where the reactant entities are presented on the left side and the product entities are given on the right side.To learn more about chemical equation refer to:
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what is molecular mass of aluminum sulfate?
The molecular mass of aluminum sulfate is approximately 342.15 g/mol.
The molecular formula for aluminum sulfate is Al₂(SO₄)₃. To calculate its molecular mass, we need to determine the atomic mass of each element in the formula and multiply by the number of atoms of each element, then add them up.
The atomic mass of aluminum (Al) is 26.98 g/mol, sulfur (S) is 32.07 g/mol, and oxygen (O) is 16.00 g/mol.
The molecular mass of aluminum sulfate can be calculated as follows:
Molecular mass of Al₂(SO₄)₃ = (2 x atomic mass of Al) + (3 x atomic mass of S) + (12 x atomic mass of O)
Molecular mass of Al₂(SO₄)₃ = (2 x 26.98 g/mol) + (3 x 32.07 g/mol) + (12 x 16.00 g/mol)
Molecular mass of Al₂(SO₄)₃ = 342.15 g/mol
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the bonds connecting adjacent amino acids in a protein is called ?
The bonds connecting adjacent amino acids in a protein is called a peptide bond.
The peptide bond is the link between two amino acids in a protein. The covalent chemical bond that connects two adjacent amino acid monomers along a peptide or protein chain is known as a peptide bond.
Neighbouring amino acids in a protein that contain carbon and nitrogen atoms. All amino acids have two primary functional groups. The amino group is located on one side of the amino acids, and the carboxyl group is located on the other. The peptide bond is made up of the two functional groups in the neighboring amino acid.
Proteins mature in the cell, forming protein disulfide bonds between the sulfur atoms of two cysteine amino acids (the cystine residue).
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The VSEPR theory allows us to determine the Select one: A. charge on an ion B. color of a compound C. bond type for a molecule D. shape of a molecule E. formula for a compound
We are able to determine a molecule's shape using the VSEPR theory.
What is the VSEPR chemical bonding theory?The VSEPR theory assumes that the molecular shape minimizes these repulsions and that all electron pairs, including bonding pairs and lone pairs, repel one another, particularly when they are close to one another.
How does VSEPR theory work?The molecule's geometry can be determined with the help of VSEPR theory. As indicated by the VSEPR hypothesis, the electrons repulse each other and will, consequently, take on a game plan that limits this repugnance. When the electron pairs or groups of electron pairs are as far apart as possible, repulsions are at their lowest.
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which property cohesion or adhesion causes surface tension in water
Answer:
cohesion
Explanation:
because because cohesion is the state where particles are closer to eacch other hence tthe. paarticles being closer resul to. a floating objct like a razoor too experience surface tension.
note
thi condition ccaan only be remove by a ssurrfacctaant
MULTIPLE CHOICE QUESTION
Is Pd a Type 1 (fixed charge) metal cation
or a Type 2 (variable charge) metal
cation?
Type 1
Type 2
Pd is a transition metal ion hence it is a type 2 metal cation.
What is transition metal ion?A transition metal ion is an ion that is derived from a transition metal element. Transition metals are a group of elements located in the center of the periodic table and characterized by their ability to form multiple stable oxidation states. This property is due to the presence of unpaired electrons in their d-orbitals, which are involved in chemical reactions.
Transition metal ions play important roles in many chemical and biological processes, including catalytic reactions, the formation of coordination complexes, and the regulation of enzymes. They are also commonly used in applications such as pigments, catalysts, and magnetic materials.
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Calculate the molar mass of BaSO4. ?
The molar mass of BaSO₄ is 233.39 g/mol.
The molar mass of BaSO₄ can be calculated by adding the molar mass of each element in the compound.
First, we need to find the molar mass of each element:
- Ba (Barium) = 137.33 g/mol
- S (Sulfur) = 32.06 g/mol
- O (Oxygen) = 16.00 g/mol
Next, we need to multiply the molar mass of each element by the number of atoms of that element in the compound:
- Ba: 137.33 g/mol x 1 = 137.33 g/mol
- S: 32.06 g/mol x 1 = 32.06 g/mol
- O: 16.00 g/mol x 4 = 64.00 g/mol
Finally, we add the molar mass of each element together to get the molar mass of BaSO₄:
- 137.33 g/mol + 32.06 g/mol + 64.00 g/mol = 233.39 g/mol
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What are the most important factors in selecting a solvent for recrystallization?
The selection of an appropriate solvent is critical for the success of a recrystallization process, as it can significantly affect the yield and purity of the final product. Some of the most important factors to consider when selecting a solvent for recrystallization are:
What is recrystallization?
Recrystallization is a technique used in chemistry to purify solid compounds based on their solubility. The process involves dissolving a crude mixture of the compound to be purified in a suitable solvent, which is then heated to a temperature at which the compound dissolves.
Solubility: The solvent should be able to dissolve the compound at high temperatures to allow for effective purification, and it should have a low solubility in the compound at low temperatures to allow for crystal formation.Selectivity: The solvent should dissolve the impurities to some extent, but not the desired compound. The impurities should remain dissolved in the solvent at low temperatures while the compound of interest crystallizes out.Boiling point: The boiling point of the solvent should be significantly higher than the melting point of the compound to prevent premature crystallization.Chemical properties: The solvent should be chemically inert towards the compound to prevent any unwanted reactions or degradation.Safety and availability: The solvent should be readily available, affordable, and safe to handle.Environmental considerations: The solvent should be non-toxic, non-flammable, and preferably environmentally friendly.Overall, the ideal solvent for recrystallization should be able to dissolve the compound at high temperatures, but not at low temperatures, be selective towards the desired compound, and be safe, available, and affordable.
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when heating this hwe reaction mixture at reflux, the reaction temperature will be maintained at approximately
The reaction temperature during reflux heating is dependent on several factors such as the boiling point of the solvent, the heating power applied, and the atmospheric pressure.
However, it is typically maintained at approximately the boiling point of the solvent. In a reflux setup, the reaction mixture is heated in a distillation flask, and the vapors produced are condensed and returned to the flask by a condenser, thus maintaining a constant temperature in the reaction mixture.
The temperature is maintained at or close to the boiling point of the solvent, which helps to keep the reaction going by providing heat and promoting mixing of the reactants.
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Which one of the following can be classified as a strong electrolyte?A) CâHââOâB) CHâOHC) NHâNOâD) HCâHâOâE) HâO
[tex]$\mathrm{CaCl}_2$[/tex] exists the only compound which completely dissociates.
What is meant by strong electrolyte?A solution is considered to be a strong electrolyte if a significant portion of the dissolved solute is present as ions. Strong electrolytes, ionic compounds and some polar compounds are entirely dissociated into ions and so conduct a current very well.
[tex]$\mathrm{CaCl}_2$[/tex] in aqueous solution dissociates to give one [tex]$\mathrm{Ca}^{2+}$[/tex] and two [tex]$\mathrm{Cl}^{-}$[/tex]ions. An electrolyte is any material that ionizes upon dissociation. Here Calcium Chloride gives one ion of Calcium and two Chloride ions. That is, from [tex]$\mathrm{CaCl}_2$[/tex] a total of three ions exists formed. Therefore it can be classified as a strong electrolyte. The strong electrolytes dissociate completely in the solution.
The complete question is;
Which of the following can be classified as a strong electrolyte?
A [tex]$\mathrm{Br}_2$[/tex]
B [tex]$\quad \mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6$[/tex]
C [tex]$\mathrm{CaCl}_2$[/tex]
D [tex]$\mathrm{H}_2 \mathrm{O}$[/tex]
E [tex]$\quad \mathrm{NO}_3$[/tex]
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