To known the multiple extraction and methylene chloride reactions.
What is methylene chloride?
Dichloromethane, another name for methylene chloride, is an odorless, flammable liquid with a volatile nature similar to chloroform. Paint stripping, the production of pharmaceuticals, the production of paint removers, and the cleaning and degreasing of metal are just a few of the industries that use methylene chloride in various industrial processes.
What is multiple extraction?
In a multiple extraction procedure, a certain amount of solvent is used to successively extract one layer (often the aqueous layer). If the compound has a low partition coefficient in the organic solvent, the extraction may need to be repeated more than twice or three times.
Because it is denser than water, methylene chloride typically makes up the bottom layer of the two-part mixture. Caffeine can be drawn out of the organic layer by brewing tea and adding methylene chloride to it.
Therefore, Caffeine can be drawn out of the organic layer by brewing tea and adding methylene chloride to it.
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Why can you use the ph information at the half-equivalence point in a titration of a weak acid with a strong base to determine the ka of the weak acid?.
The quantity weak acid present in solution is equal to the quantity of conjugate base created at the half equivalence point.
For weak acid/strong base titrations, the pH at the equivalence point is >7. This is because the solution consists of water, strong base (neutral) cations, and weak acid (base) anions. The pH at half the equivalence point volume (half the equivalence point) is the pKa.
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determine how each property of water changes upon addition of a nonvolatile solute.
Simply put, a nonvolatile solute is something that does not readily vaporize. Additionally, it does not raise the solution's vapor pressure when dissolved in a solvent.
boiling level —————-> grows with a soluble
Volatile pressure —————-> Reduces with a soluble
freezing level ———————-> Reduces with a soluble
vanthoff factor is the basis for the largest variance. As the quantity of ions rises, the divergence also does.
LiCl ———-> two ions,
NaF ———-> ions,
CH3OH, 2 —————> zero ions
MgCl2 —————> 3 ions
Thus, MgCl2 has the largest variance.
Low vapour pressure and a high boiling point are characteristics of non-volatile substances. Non-volatile solutes include, for example, salt and sugar. Alcohol, mercury, and gasoline are examples of volatile substances.
Non-volatile materials: Non-volatile materials are those that do not quickly evaporate. At the typical room pressure and temperature, they don't have a greater vapor pressure. At room temperature, nonvolatile substances will mostly exist as solids. Nonvolatile substances include silver nitrate and sodium chloride.
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a u.s. department of agriculture law on how much coloring or other additives can be in food is an example of law or regulation.
A U.S department of agriculture law on how much coloring or other additives can be in food is an example of administrative law or regulation.
The American system is a common law system that relies heavily on case law to give formal judgments. In our common law system, even where the law is concerned, the judicial outcome of previous litigation is of great importance to the court's decision on that previous matter. Farm bills and reauthorization of children's meals.
As detailed on the Farm Bill page the Omnibus Farm Bill is the cornerstone of US food policy and is approved by Congress every five years. Free access to courts and quasi-judicial bodies, as well as adequate legal assistance, should not be denied to anyone on the basis of poverty. Regulations are regulations made by executive departments and agencies and categorized by subject matter in federal regulations.
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Which phase change is exothermic?
condensation
melting
sublimation
vaporization
The phase change that is exothermic is option A: condensation
Does condensation produce heat?The molecules give up their thermal energy during condensation. Exothermic refers to the process where molecules release heat energy. Exothermic condensation would result. Keep in mind that thermic refers to "heat," while exo means "to leave."
Note that The best illustration of condensation—where water vapor transforms back into liquid water—are those huge, fluffy clouds hovering above your head. Additionally, as the water droplets in a cloud unite, they grow sufficiently heavy to create raindrops that can fall directly upon your head.
Therefore, While freezing, condensation, and deposition are exothermic processes, fusion, vaporization, as well as sublimation are endothermic processes. Phase changes, also known as phase transitions, include changes in state.
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How do I calculate the bond order for H2- and H2+?
The bond order for H2- and H2+ is calculated using the molecular orbital (MO) diagram.
Bond order: what is it?
Bond order quantifies the stability of a bond by specifying the number of chemical bonds that exist between two atoms.Bond orders range from 1 for a single covalent bond between two atoms through 2 for a double covalent bond, 3 for a triple covalent bond, and so forth.If a molecule contains more than two atoms, the bond order must be determined by-
Sketch out the Lewis framework.Add up the number of ties.Count the total number of bond groups that each atom is connected to.Add the amount of atom-to-atom bonds to the total number of bond groups in the molecule, then subtract the result.If there is no order in the bonds, molecules cannot form.
A higher bond indicates that there is more electron attraction. When the bond order is higher, the atoms are more tightly bound. When the bond order is lower, there is less electron attraction, which results in a looser bond holding the atoms together. The stability of a bond is also revealed by bond order. Higher bond order and greater stability result from more electrons holding the atoms together.Create a schematic of the molecular orbitals (MO). As one electron is contributed by each hydrogen atom, H2 + has one electron while H2 - has three.
The result of calculating their bond order is:
Bond Order H 2+ = 1/2 x ( Bonding Antibonding ) = 1 /2 x ( 1 0 ) = 1 /2
Bond Order H 2- = 1/ 2 x ( Bonding Antibonding ) = 1/2 x ( 2 1 ) = 1/2 x 1 = 1/2
Both are equally stable, so neither is more so. However, they are unavoidably less stable than H2 .
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4. the distillation vapor was condensed and collected. suppose that one mole of distillate is collected. how many moles of anisole and water would be present in the condensate? how many grams of each? how many ml of each? (mw of anisole
Learn more about distillation and condensation process.
What is distillation?
Distillation is a process in which a liquid is transformed into a vapor and then condensed back into a liquid state. The simplest illustration of it is when distilled water drops are left on a chilly surface after being deposited as steam from a kettle.
What is condensation?
The process by which matter transitions from its initial gaseous form into its liquid state is known as condensation. For instance, condensation happens when airborne water vapor (in its gaseous form) makes the transition to liquid water upon coming into contact with a cooler surface.
Given density of isoamyl acetate = 0.88g/ml
volume of isoamyl acetate = 75 ml
MW of isoamyl acetate = 130.2g/ml
Therefore, no.of moles =mass/ molar mass
and mass = density*volume
Therefore, no.of moles = density*volume/molar mass
= 0.88g/ml*75 ml/130.2g/ml
=0.55 moles
similarly for methyl benzoate
no. of methyl benzoate = 1.09g/ml*115ml/136.2gml
=0.92 moles.
Boiling point of isoamyl acetate = 142°c (vaporize first)
Boiling point of methyl benzoate= 199.6°c (moves down)
mole fraction of isoamyl acetate = 0.51/0.57+0.92
=0.357
mole fraction of the methyl benzoate = 0.643
%of isoamyl acetate= 35.7%
%of methyl benzoate= 64.3%
mole ratio= 35.7:64.3
Initial boiling point 166°c
composition of vapor in equilibrium with liquid 75: 25 (using theoretical plate1)
↓ ↓
IA MB
Re vaporization at 145°c
composition of vapor, at 145°c
95:5 ( using theoretical plate 2)
↓ ↓
IA MB
Condensate⇒ low density mixture
% composition of Condensate= 95%
(IA) using two theoretical plates
Therefore, Condensate is 95%
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How can you tell if a compound is covalent by looking at the name?
There will be numerical prefixes.
There will be a metal.
There's no way to tell.
There will be roman numerals.
Answer:
Explanation:
Assume you are performing the calibration step of experiment 8 and you begin with 30 g of water at 20 oc and 30 g of water at 80 oc. After adding the two portions of water into your calorimeter setup and following the procedure outlined in the experiment, you determine the temperature of the mixed portions of water to be 45 oc. What is the heat capacity of the calorimeter?.
The heat capacity of calorimeter is 133.76 J/c.
What is calorimeter?
A calorimeter is a device used in calorimetry, a procedure for calculating heat capacity and trying to measure the heat of chemical reactions or even other physical changes. Among the most popular kinds are dsc calorimeters, isothermal micro calorimeters, titrimetric calorimeters, and accelerated rate calorimeters. A straightforward calorimeter is just a metal container with a thermometer suspended beyond a combustion chamber. It's one of the measurement tools used in the research of chemistry, biochemistry, and thermodynamics. The two substances A and B are separately added to a calorimeter, and the original and final temperatures are recorded, in order to determine the enthalpy change per mole of substance A in a reaction between those two substances.
We know:
mw Cw Ow = mc Cc delOc + Ccal delc
80g * 4.18/gc * (80-45)C = 80g * 4.18J/g * (45-20) + Ccal *(45-20)
= 11704J = 8360 + Ccal (25)
= 133.76 j/c
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What happens to the energy as metal parts cool
Answer: it transfers out of the metal the heat stops and the energy is absorbed by other things
Explanation:
Sharon reads two different articles about avocados. The first article, in a weight-loss magazine, claims that avocados
are unhealthy because they are high in fat. The second article, in an annual publication from a doctors' group,
that the fat in avocados is a type that IS good for the heart.
claims
To assess these claims, which question might Sharon ask?
O Which source do avocados come from?
O Where
are avocados soid?
O Is the source an authority on the subject?
• How much do avocados cost?
Is the source an authority on the subject? Option C.
Authorship is a concept that represents the authority an individual author has established on the web for a particular topic. Authors publishing on trusted sites build permissions and apply them when publishing on other platforms. A good example of a traditional system of power is a monarchy.
Most governments throughout history have ruled under this form of authority. In this form of rule, the subject accepts the nature of authority. They refrain from challenging the traditional rights of powerful groups and individuals. can be defined as Permissions that are important in determining a website's credibility. To determine who is responsible for the website who wrote the information etc.
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In step #2 of the procedure, you weighed out and used 2 g of benzaldehyde instead of 1. 17 g.
The calculated percentage yield will not change because in this reaction acetone is the limiting reactant and not benzaldehyde. Hence, the excess amount of benzaldehyde does not affect the yield.
What is percentage yield?The percentage yield of a reaction is the ratio of actual yield to the theoretical yield multiplied by 100. It determines how much of the reaction is completed.
In the reaction of benzaldehyde with acetone the yield of the precipitate dibenzalacetone is dependent on the acetone since it is the limiting reactant which determines the amount of product.
Therefore, the changed amount of benzaldehyde does not affected to the yield.
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Your question is incomplete. But your complete question was as follows:
In step #2 of the procedure, you weighed out and used 2 g of benzaldehyde instead of 1. 17 g .Would the calculated percentage yield of the precipitate (dibenzalacetone)
be too high
, too low, or
unaffected by the following?
Is mass conserved when 40 g of sodium hydroxide undergoes a chemical change during an interaction with 36. 5 g of hydrogen chloride? use complete sentences to support your answer by explaining how this can be demonstrated.
Yes, mass is conserved when 40 g of sodium hydroxide undergoes a chemical change during an interaction with 36.5 g of hydrogen chloride
What is the law of conservation of mass?
According to the law of conservation of mass, the mass of the reactants must be equal to the mass of the products for a low energy thermodynamic process.
It is believed that there are a few assumptions from classical mechanics which define mass conservation. Later the law of conservation of mass was modified with the help of quantum mechanics and special relativity that energy and mass are one conserved quantity. In 1789, Antoine Laurent Lavoisier discovered the law of conservation of mass.
Any chemical reaction must follow the law of conservation of mass. Meaning that mass cannot be created nor destroyed. Since all chemical reactions must follow this law, no matter what reaction happens, mass is conserved.
NaOh + HCL - NaCl +H2O
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which one of the following will form a basic solution in water? which one of the following will form a basic solution in water? kclo2 nac2h3o2 libro licn all of the above will form basic solutions.
KClO₂, NaC₂H₃O₂, LiBrO, and LiCN will form basic solutions.
How is a basic solution formed?
A basic solution can be created easily. A solid base is dissolved in water to create a basic solution. Water reacts with some solid bases as a result, producing hydroxide ions. For instance, when water (H2O) is exposed to NaOH, the reaction results in Na+ and OH-.
LiBrO in an aqueous solution is basic. This conjugate base creates hydroxide ions when it is in equilibrium with the water.
Salt that is basic is NaC₂H₃O₂. Salts produced by the interaction of a strong base and a weak acid are typically basic. The solution will be basic.
The potassium ion in KClO₂ does not hydrolyze in water. Due to the ionization of ClO−2 C l O 2 − hydroxide ions are formed. This results in a solution with a basic pH value. Similarly, LiCN is also basic in water.
Hence, the answer is all of the above.
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a bomb calorimeter has a heat capacity of 2.47 kj/k. when a 0.106-g sample of a certain hydrocarbon was burned in this calorimeter, the temperature increased by 2.14 k. calculate the energy of combustion for 1 g of the hydrocarbon.
The energy of combustion for 1 gm of the hydrocarbon is 0.56 kJ
What is a bomb calorimeter?
Bomb Calorimeter is a constant-volume calorimeter which measures the heat of a particular reaction or measures the calorific value of the fuels. They can withstand large pressure produced within the calorimeter due to the reaction or burning of fuel.
The above question can be solved by
Energy of combustion = m X c X ΔT
m = mass of hydrocarbon burnt ,
c = heat capacity of calorimeter ,
ΔT = temperature change
Energy of combustion = 0.106g X 2.47kJ/K X 2.14K = 0.56kJ
Energy of combustion when 1g of hydrocarbon is burnt = (0.56kJ / 0.106g ) X 1g = 5.28kJ
Hence, The energy of combustion for 1 gm of the hydrocarbon is 0.56 kJ
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what is the concentration (in m) of a sample of the unknown dye with an absorbance of 0.15 at 542 nm?
Using the regression equation, the concentration of a sample with an absorbance of 0.25 is 1.76*10^-5M
Using the regression equation obtained from the model,
y = 15200x - 0.018
y = absorbance. x = Concentration
Concentration of unknown dye sample with absorbance of 0.25:
Substitute the absorbance value y = 0.25 into the equation and calculate the concentration x:
0.25 = 15200x - 0.018
side
15200x = 0.25 + 0.018
15200X = 0.268
Division by 15200
x = (0.268 ÷ 15200)
x= 1.76*10^-5M, which is the concentration of the sample.
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2. two kinds of carbonyl acceptor structures in addition to benzoate ester can be used in reaction with phenylmagnesium bromide to afford triphenylmethanol. what are they? hint: each of the three reacts with a different number of equivalents of the grignard reagent.
Two kinds of carbonyl acceptor structures in addition to benzoate ester are dialkyl carbonate and benzophenone.
Grignard reaction is an organometallic organic chemical reaction in which alkyl, allyl, vinyl or aryl-magnesium halides who are called as Grignard reagent are added to the carbonyl group in aldehyde or ketone. This reaction is important for the formation of carbon-carbon bonds. or basically they are mainly used for the formation of carbonyl compounds.
Triphenylmethanol can be synthesized by Grignard reaction using 3 different starting materials and also the different number of equivalents of Grignard reagent.
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Calculate the theoretical yield for p-nitrobenzoic acid and p-nitrobenzyl alcohol from p-nitrobenzaldehyde. (Cannizzaro Reaction)
Mass of p-nitrobenzaldehyde used: 0.300g
Volume of 30% KOH: 3 mL
Moles of p-nitrobenzaldehyde is 0.001985mol.
What do you mean by Cannizzaro Reaction?
Cannizzaro reaction is a chemical reaction named after Stanislao Cannizzaro that involves the base-induced disproportionation of two molecules of a non-enolizable aldehyde to yield a carboxylic acid and a primary alcohol.
theoretical yield of p-nitrobenzoic acid
=0.001985 mol p-nitrobenzaldehyde*1mol p-nitrobenzoic acid/2mol p-nitrobenzaldehyde*167.12g/1mol
=0.166g
theoretical yield of p-nitrobenzyl alcohol
=0.001985mol p-nitrobenzaldehyde*1mol p-nitrobenzyl alcohol/2mol p-nitrobenzaldehyde*153.12g/1mol
=0.152g
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a sample of gas contains 0.1700 mol of and 0.08500 mol of and occupies a volume of 13.5 l. the following reaction takes place: calculate the volume of the sample after the reaction takes place, assuming that the temperature and the pressure remain constant.
The volume of the ideal gas sample after the reaction takes place is 13.5 L.
We need to know about the ideal gas theory to solve this problem. The ideal gas is assumed that there is no interaction between particles in a gas. It can be determined by the equation
P . V = n . R . T
where P is pressure, V is volume, n is the number of moles gas, R is the ideal gas constant (8.31 J/mol.K) and T is temperature.
From the question above, we know that
n1 = 0.17 mol
n2 = 0.085 mol
V = 13.5 L
When the initial and final temperature is the same, we can use the ratio of mol and volume as
n / V = constant
Hence,
ntotal / Vtotal = n1 / V + n2 / V
0.17 + 0.085 / Vtotal = 0.17 / 13.5 + 0.085 / 13.5
0.255 / Vtotal = 0.255 / 13.5
Vtotal = 13.5 L
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chemical A has a mass of 5 grams and chemical B has a mass of 10 grams. if two chemicals are mixed and a complete chemical reaction occurs what is the total mass of the products
The mass of the products when 5g of a chemical A is combined with 5g of chemical B is 10g.
What is law of conservation of mass?The law of conservation of mass is a law of classical physics that states that the total mass of a closed system remains constant regardless of the chemical or physical changes that take place within it.
The law explains that a mass in an isolated system can neither be created nor be destroyed but can be transformed from one form to another”.
This means that in a chemical reaction, the mass of the reactants must be equal to the mass of the products.
According to this question, chemical A has a mass of 5 grams and chemical B has a mass of 10 grams. If these two chemicals are mixed and a complete chemical reaction occurs, the total mass of the products in accordance with the law of conservation of mass is 5g + 5g = 10 grams.
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True or false: a scientific law is different from a scientific theory because it describes something in nature without attempting to explain it
A scientific law is different from a scientific theory because it describes something in nature without attempting to explain it, this statement is true.
What is difference between scientific theory and scientific law ?A scientific law foretells the outcomes of particular beginning circumstances. It may tell you what color hair your unborn kid would have or how far a baseball will go when fired at a specific angle.In contrast, a theory seeks to offer the best plausible justification for why events take place the way they do.
A scientific law often describes an observable phenomena. It doesn't explain the phenomenon's existence or its origins. A scientific theory is the explanation for a phenomena. It is untrue that with enough study, hypotheses become laws.
Thus, a scientific law is different from a scientific theory because it describes something in nature without attempting to explain it, this statement is true.
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22. NaHCO, decomposes when exposed to heat:
2 NaHCO,(s)→ Na₂CO₂ (s) + CO₂(g) + H₂O(t) AH = 91.5 kJ
What mass of NaHCO, is decomposed by 256 kJ?
I
470 g of NaHCO3 is decomposed by 256kJ when exposed to heat.
How to find the mass of NaHCO3?
From the balanced equation,
2x84 g NaHCO3 absorbs 91.5 kJ
X g NaHCO3 absorbs 256 KJ
X= 2x84x 256/91.5
X= 470 g NaHCO3
Baking soda, also known as sodium bicarbonate (NaHCO3), is a substance that, when heated, can decompose. Sodium bicarbonate begins to disintegrate into sodium carbonate (Na2CO3), water (H2O), and carbon dioxide at temperatures over 176 degrees Fahrenheit (80 degrees Celsius) (CO2).
The sodium bicarbonate will break down more quickly the hotter it is. The only product that will still be solid is sodium carbonate. At the warm temperature, both carbon dioxide and water are gaseous, therefore they will dissipate into the ambient air.
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Solid aluminum has a specific heat capacity of 0.90 J/ gxK. How many joules of heat are absorbed to raise the temperature of 24.0 grams of aluminum from 300. K to 350. K?
1. 22 J
2. 45 J
3. 1100 J
4. 1200 J
Answer:: 1100 j
Explanation:
Solid aluminum has a specific heat capacity of 0.90 J/ gK joules of heat are absorbed to raise the temperature of 24.0 grams of aluminum from 300. K to 350. K is 11.080 J
Heat is the transfer of kinetic energy from one medium or object to another from an energy source to a medium or object
Here given data is
Specific heat capacity = 0.90 J/gK
Temperature = 300. K to 350. K = 350 - 300 = 50 K
Mass = 24.0 grams
We have to calculate the heat = ?
Q =mCΔT
Q = 24.0 grams× 0.90×50 K
Q = 11.080 J
11.080 J heat are absorbed to raise the temperature
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Create an energy transformation for using a flashlight to see in the dark. Ex: Electrical to Sound
In order to use a flashlight to see in the dark, the flashlight must first transform the electrical energy it receives from batteries into light energy.
What is flashlight?
A portable hand-held electric lamp is known as a torch (UK, Australia), or a flashlight (US, Canada). The light source used to typically be a tiny incandescent light bulb, but since the mid-2000s, light-emitting diodes (LEDs) have taken their place. A typical flashlight is made up of a light source mounted inside a reflector, a transparent cover to shield the light source as well as reflector, a battery, a switch, and sometimes a lens. All of these components are housed in a case. Around 1899, the development of dry cells and tiny incandescent electric lamps made the first battery-operated flashlights feasible. Today's flashlights run on disposable as well as rechargeable batteries and mostly use light-emitting diodes. Some require the user to turn a crank, shake the lamp, or squeeze it in order to operate. Some batteries can be recharged using solar panels.
In order to use a flashlight to see in the dark, the flashlight must first transform the electrical energy it receives from batteries into light energy. This light energy is then emitted from the flashlight in a concentrated beam, which illuminates the area in front of the person using the flashlight and allows them to see in the dark.
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calculate the mass of mgco3 precipitated by mixing 10.00 ml of a 0.200 m na2co3 solution with 5.00 ml of a 0.0650 m mg(no3)2 solution.
The mass of Magnesium carbonate is 0.275 g.
The balanced chemical reaction is shown below,
Na₂CO₃ + Mg(NO₃)₂ → 2 NaNO₃ + MgCO₃
0.200 M 0.0650 M ?
10.0 5.00 mL ?
Since the volume and concentration of Mg(NO₃)₂ and Na₂CO₃ is given, we can calculate the number of moles for each of them and then determine the limiting reagent.
Convert the volume of Mg(NO₃)₂and Na₂CO₃ to liters:
5.00 mL x ( 1 L/1000 mL ) = 5.00 x 10⁻³ L
10.00 mL x ( 1L/ 1000 mL ) = 1.000 x 10 ⁻² L
Number of mol Mg(NO₃)₂ = (0.0650 mol /L) x 5.00 x 10⁻³ L
= 3.25 x 10⁻⁴ mol Mg(NO₃)₂
Number of mol Na₂CO₃ = (0.200 mol / L) x 1 x 10⁻² L
= 2.000 x 10⁻³ mol Na₂CO₃
Limiting reagent = 3.25 x 10⁻⁴ mol Mg(NO₃)₂ x ( 1 mol Na₂CO₃ / mol Mg(NO₃)₂ )
= 3.25 x 10⁻⁴ mol Na₂CO₃ required .
Limiting reagent is Mg(NO₃)₂ since 2.25 x 10⁻⁴ mol Na₂CO₃ is required to
react completely with 2.25 x 10⁻⁴ Mg(NO₃)₂, and there is an excess.
Number of moles of MgCO₃ produced is calculates as follows:
= 3.25 x 10⁻⁴ mol Mg(NO₃)₂ x ( 1 mol MgCO₃ / 1 mol Mg(NO₃)₂ )
= 3.25 x 10⁻⁴ mol MgCO₃
The formula for calculating number of moles is given as :
Mole = mass/molar mass
⇒ Mass= Mole × molar mass
Mass = 3.25 x 10⁻⁴ mol MgCO₃ x 84.31 g/mol
= 0.275 g
Hence, the mass of MgCO₃ is 0.275 g
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8. Draw the lewis dot diagram for the following electron configuration
1s² 2s² 2p 3s² 3p6 4s²3d¹d 4p5
Answer:
Bromine has 7 electrons but to complete the octet you add one more electron so it has a net charge of 1-
Explanation:
Compare the behavior of the particles in hot tea with the behavior of the particles in ice
cream. How are they similar? How are they different?
Explanation:
Absolute zero is the temperature at which particles have theoretically zero kinetic energy.
The higher temperature of the hot tea means that the water molecules in the tea will move faster on average than the water molecules in ice cream.
what kind of change does a substance undergo without altering the molecules or atoms that are present?
Physical change does not alters the molecule or atoms that are present.
Physical changes are those changes that do not alter the identity of the molecules or atoms that are taking part in the chemical reaction. Or we can say that physical changes are changes in which no bonds are broken or formed. This means that the same types of compounds or elements that were present at the beginning of the change are there at the end of the change as well. Because the ending materials are the same as the beginning materials, the properties (such as color, boiling point, etc.) will also be the same. Physical changes also involve moving molecules around, but not changing them.
Whereas Chemical changes occur when bonds are broken and are formed between molecules or atoms. This means that one substance with a certain set of properties (such as melting point, color, taste, etc) is turned into a different substance which have different properties. Chemical changes are frequently harder to reverse than physical changes.
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how many moles of oxygen are formed when 82.5 g of kno3 decomposes according to the following reaction? the molar mass of kno3 is 101.11 g/mol.
The mole of oxygen are formed from KMNO3 is 0.724 mol.
calculation:-
Given the mass of KNO3 KNO3 is 82.5g
The molar mass is 101.11 g/mol.
Mole of KNO3 = 82.5g/ 101.11 g.
0.724 mol
From the balanced equation, it is clear that for every 1 mole of KNO3 K N O 3 = 54 moles of oxygen are required.
Therefore, 0.724 mol of oxygen is required for forming 82.5 g of KNO3 KNO 3.
The formula mass of a substance is defined as the sum of the atomic masses of the atoms that make up the ionic compound. It is generally used for ionic compounds that do not contain individual molecules but contain ions as building blocks. Mass can be defined as a measure of the amount of matter in the body. Weight is a measure of weight acting on the mass. The SI unit of mass is the kilogram.
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Magnesium is an alkaline earth metal. With which group of elements is magnesium most reactive?.
Magnesium is most reactive with noble gases.
Alkaline earth metal found in group 2 of the periodic table.All the elements of group 2 have beryllium,magnesium, and calcium strontium,barium.these all have 2 valence electrons each in their atom.this all can lose their 2 valence electron easily to form positive ions. These are divalent and ionic in their chemical reaction.metals gets oxidised by losing their valence electrons.the chemical reactivity of a metal is equivalent to their lose of electrons.strontium is group 2 element that does not occur as a free element due to its extreme reactivity with oxygen and water.noble gases have full valence shell electrons.so,magnesium is most reactive with noble gases.
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Determine the order of steps in the mechanism of acid-catalyzed hydration of propene.
There are 3 major steps involved in the mechanism of acid-catalyzed hydration of propene they are formation of carbocation, nucleophile attacks on carbocation and Deprotonation to form alcohol.
Acid catalyzed hydration is the process of breaking of a pi bond in an alkene or alkyne so that water can be added. It is an electrophilic hydration reaction because the water molecule acts as an electrophile once it has been protonated by the acid. It is an acid-catalyzed reaction because the acid, such as sulfuric acid, acts as a catalyst here.
There are 3 major steps involved in the mechanism of acid-catalyzed hydration of propene. They are as follows;
1. Carbocation formation from propene which is formed by attack of [tex]H_3O^{+}[/tex] ion.
2. In the next step nucleophile attacks the carbocation that is formed.
3. Next step is deprotonation takes place where water molecule is removed to form respective alcohol that is propanol
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