A 0. 20 mol sample of MgCl₂(s) and a 0. 10 mol sample of KCl(s) are dissolved in water and diluted to 500 ml. the concentration of Cl⁻ in the solution is 1M.
the equations is given as :
MgCl₂ ----> Mg²⁺ + 2Cl⁻
KCl ----. K⁻ + Cl⁻
moles of chloride ion in MgCl₂ = 2 × 0.20 mol
= 0.40 mol
moles of chloride ions in KCl = 0.10 mol
total moles = 0.40 + 0.10 = 0.50 mol
volume = 500 mL = 0.5 L
concentration Cl⁻ , molarity = 0.50 / 0.5
=1 M
Thus, A 0. 20 mol sample of MgCl₂(s) and a 0. 10 mol sample of KCl(s) are dissolved in water and diluted to 500 ml. the concentration of Cl⁻ in the solution is 1M.
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an empty erlenmeyer flask that weighs 93.667g has a quantity of liquid vaporized in it at 96.4oc and a pressure of 1583.8 torr. the mass of the cooled flask is 94.345g. when the flask is filled with water, the mass of the flask and water is 268.92g. (a). determine the molecular weight of the unknown liquid. g/mol ** write answer in decimal form to one decimal place, no units in answer**
The question is not scientific as it measures weight with a unit of mass.
Mass of water filling the flask =268.92 g - 93.667 g = 175.25 g . Molecular weight of the flask = 175.25 g / (1.00 g/cm^3) = 284.4 cm^3.
A given molecule's mass, expressed in daltons, is known as its molecular mass. Because different isotopes of an element are present in different molecules of the same compound, their molecular masses can vary. The mass of a substance per mole is its molecular weight. Typically, grams per mole are used to measure this. Molecular weight, also known as molecular mass, is the mass of a substance's molecules, based on 12 as the carbon-12 atom's atomic weight. In real life, it is calculated by adding the atomic weights of the atoms in the compound's molecular formula. The properties of a polymer are inversely correlated with its molecular weight. Mechanical properties typically increase as the molecular weight does.
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According to the Cahn-Ingold-Prelog (CIP) rules for assigning R and S configurations to stereocenters, which of the following substituents has the highest priority? A) -CECH B) -CH₂CH₂ C) -CH=CH₂ D) -CH
Should be aware of the R/S configuration CIP rules' priority ranking. A) -CECH (option A).
How would you define stereocenter?Stereocenter. An atom that is connected to four different atoms is known as a stereogenic center, and simply a stereocenter. A stereocenter, also known as a stereogenic center, is a particle group in which any two groups can be exchanged to produce a stereoisomer.
Is a stereocenter a chiral carbon?When a carbon is joined to four other atoms, or groups of atoms, chiral centers are created. Although they are mirror reflections of one another, chiral compounds are not identical. Stereocenters are also chiral centers, although not usually the other way around.
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Question 4 (1 point)
How many oxygens are present on the reactants side of this equation?
KCIO3 --> KCI + O₂
01
5
3
2
Oxygens are present on the reactants side of this equation is 3
Reactant is a substance that enters into and is altered in the course of a chemical reaction and the substance to the left of the arrow in a chemical equation are called reactant and a reactant is a substances that is present at the start of a chemical reaction and the substances to the right arrow are called product and a product is a substances that is present at end of chemical reaction
Here given reaction is
KCIO₃ → KCI + O₂
Here 3 oxygen atom are seen in the reactant so 3 oxygen atom are in the reactant side in the equation
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which dating method would be most appropriate for establishing the age of a volcanic ash layer from an early hominid site in eastern africa? group of answer choices amino acid dating carbon 14 dating electron spin resonance dating potassium-argon dating
To find the dating method, learn all the types of dating method.
What is electronic spin resonance method?
In the presence of a static magnetic field, electron spin resonance (ESR), a spectroscopic technique, can detect transitions between the energy levels of electron spins caused by electromagnetic radiation.
What is dating method?
A technique called radiocarbon dating offers precise age estimates for carbon-based materials that come from living things. 1. The amount of carbon-14 in a sample can be measured and compared to an internationally accepted reference standard to estimate its age.
Therefore, we can conclude that it is electronic spin resonance method.
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when an oil sample analysis indicates elevated levels of silicon, which of the following should be inspected first?
Must first be inspected in oil sample analysis, low pressure intake circuit for leaks. Correct asnwer: letter C.
How does oil analysis help prevent engine damage?
Oil analysis helps prevent engine damage by identifying potential problems and addressing them before they cause major damage. By monitoring the health of your engine oil, you can avoid costly repairs and extend the life of your engine.
Some ways to prevent engine damage from occurring include:
Regularly changing your oilUsing the proper oil for your engineMaintaining proper engine operating temperaturesAdditionally, oil analysis can help identify potential problems early on, allowing you to take corrective action before major damage occurs.
The group of options with respect to the question, which of the following should be inspected first? Son:
A) Tribology
B) engine off, engine hot: syringe at mid-sump level
C) low pressure intake circuit for leaks
D) thick film and boundary
Correct answer: letter C.
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which element may have more than eight valence electrons around it when present in a covalent compound?
Element may have more than eight valence electrons around it when present in a covalent compound is phosphorous
Valence electron are the electron located at the outermost shell of an atom and an atom like phosphorous or sulfur which has more than an octet is said to have expanded its valence shell and this can only occur when the valence shell has enough orbitals to accommodate the extra electron for example in the case of phosphorous the valence shell has a principle quantum number n = 3 and the maximum number of electron possible in the valence shell of the second row element is eight however the element of third row such as phosphorous and sulfur can form stable system by sharing eight or more electron
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S
Show how the total number of electrons for the third energy level can be determined by using the quantum numbers.
Use the paperclip button below to attach files.
Student can enter max 3000 characters
The element could be X is phosphorus .
What is element?
An element is the fundamental item that can't be easily broken onto smaller of pieces. In chemistry and physics, an elementary is a substance that can't be broken down by non-nuclear reactions. In computing and the mathematics, an element is the distinct piece of a larger system or set.
An ionic compound is formed by the ions, which their charges replaced, so the compound Na₂X is formed by the ions Na⁺ and X⁻². Thus, X must gain two electrons to be stable at the octet, so it has 6 valence electrons. Because it can accommodate up to 12 electrons, the element expands the octet, do it must be in the 3rd period or higher.
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How many moles of Neon are in 68.4 grams?
Answer: 3.39 moles
Explanation:
Answer:
3.39
Explanation:
The molecular formula for Neon is Ne. The SI base unit for the amount of substance is the mole. 1 grams of Neon is equal to 0.049554750566163 moles.
Mode for O2!!!!!!!!!!!!!
Answer:
There are 2 modes in O2.
O2 is dioxygen.
Explanation:
Two oxygen atoms joined together for dioxygen.
Also, for reference, the prefix "di" means "two," "twice," or "double."
Calculate the average atomic mass of chromium, given the following percent abundances and isotope masses: 4.350 % 49.946 amu; 83.790% 51.941 amu; 9.500% 52.941 amu and 2.360% 53.939 amu
Asnwer: average atomic mass of chromium is 52amu
Calculations:
49.946amu: 4.350%= 0.0435
51.941amu: 83.790%= 0.8379
52.941amu: 9.500%= 0.095
53.939amu: 2.360%= 0.0236
Average atomic mass of chromium = 0.0435(49.946) + 0.8379(51.941) + 0.095(52.941) + 0.0236(53.939)
= 51.9963703amu
= 52 amu
Which of the following statements correctly describe wave-particle duality?
a. matter and energy are different forms of the same entity.
b. energy and mass can be interconverted.
c. all matter exhibits wavelike motion.
Wave-Particle Duality theory states that all matter exhibits wavelike motion.
According to the Wave-Particle Duality theory, both particles and waves can have characteristics that are similar to one another. This definition is opposed to Newtonian physics or classical mechanics. De Broglie (1892-1987) put up a solution to this quandary in 1924. He believed that waves characterize all moving objects. He combined linear momentum with the Planck constant.
E = hv = hc/λ
so
λ=hcE........(1)
and
p = E/c = mv
(p is the momentum of the object, m is the object's mass, and v is the velocity of the object) so
E = mvc
Plug this into (1), we have
λ = hc/mvc = h/mv
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nitrous oxide was first discovered by a french psychiatrist who was attempting to develop a sedative agent to treat schizophrenic patients. True or False
Nitrous oxide was first discovered by a French psychiatrist who was attempting to develop a sedative agent to treat schizophrenic patients. This statement is false.
What is Nitrous Oxide?
Nitrous oxide is a colorless, odorless chemical compound and non-combustible gas at normal room temperature.
It is generally known as 'laughing gas' and its molecular formula is N2O.
Other characteristics of this gas include sweet, gentle smell and and slight sweet taste.
Simply put, nitrous oxide is the least non-toxic gas that is used for inhalational anesthetic purposes.
However, there are some mild side effects including dizziness and unconsciousness which occur after inhaling gas.
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A 500. Ml aqueous solution of na3po4 (molarmass=164g/mol) was prepared using 82g of the solute. What is the molarity of na3po4 in the resulting solution?.
The molarity of Na₃PO₄ in the solution is 1 M.
What is molarity?
Molar concentration, also known as molarity, amount concentration, or substance concentration, is a unit used to describe the amount of a substance in a solution expressed as a percentage of its volume. The number of moles per litre, denoted by the unit symbol mol/L as well as mol/dm3 in SI units, is the most widely used unit for molarity in chemistry. One mol/L of a solution's concentration is referred to as one molar, or 1 M.
From the question,
We are to determine the molarity of the solution.
First, we will determine the number of moles of the solute (Na₃PO₄) present
Mass of Na₃PO₄ = 82 g
Using the formula
[tex]number of moles = mass/molar mass[/tex]
Molar mass of Na₃PO₄ = 163.94 g/mol
∴ Number of moles of Na₃PO₄ present = [tex]82/163.94[/tex]
Number of moles of Na₃PO₄ present = 0.500 moles
Now, for the molarity of the solution
Using the formula
Molarity = no. of moles/volume
Volume of the solution = 500 mL = 0.5 L
∴ Molarity of the solution = [tex]0.500/0.5[/tex]
Molarity of the solution = 1 M
Hence, the molarity of the solution is 1 M.
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What is the enthalpy change (in kJ) of a chemical reaction that raises the temperature of 250.0 mL of solution having a density of 1.25 g/mL by 2.40°C? (The specific heat of the solution is 3.74 J/g ⋅
⋅
K.)
The enthalpy change (in KJ) of the chemical reaction that raises the temperature of the solution by 2.40 °C is 8.976×10⁻³ KJ
How do I determin the enthalpy change?We'll begin by obtainig the mass of the solution. This can be obtained as follow:
Volume of solution = 250.0 mLDensity of solution = 1.25 g/mLMass of solution =?Mass = density × volume
Mass of solution = 1.25 × 250
Mass of solution = 312.5 g
Next, we shall determine the heat energy absorbed by the solution. This can be obataned as follow:
Mass of solution = 312.5 gChange in temperature (ΔT) = 2.40 °CSpecific heat capacity of solution (C) = 3.74 J/gºC Heat absorbed (Q) =?Q = MCΔT
Q = 312.5 × 3.74 × 2.4
Q = 2805 J
Finally, we shall detetrmine the enthalpy change. This can be obtained as follow:
Heat absorbed (Q) = 2805 J = 2805 / 1000 = 2.805 KJMass of solution (m) = 312.5 gEnthalpy change (ΔH) =?Q = m × ΔH
2.805 = 312.5 × ΔH
Divide both sides by 312.5
ΔH = 2.805 / 312.5
ΔH = 8.976×10⁻³ KJ
Thus, the enthalpy change is 8.976×10⁻³ KJ
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What colored shapes gillian will not need for her model of the electron transport chain?.
The orange circle is the colored form that Gillian won't require for her version of the chain of electron transport.
Why do we need electrons?Many physical processes, such as gravity, electrical interactions, weak interplay, electricity, magnets, chemistry, & thermal conductivity, depend on electrons.
What do you mean by electron?A negatively charged particle known as an electron can either be free or attached to an atom (not bound). One of the three main types of atoms within an atom is an electron that is bonded to it; the other two were protons and neutrons.
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A crucible is a severe test or trial. It is also a vessel in which materials are melted at high temperatures to produce a more refined substance. What do you think a crucible might symbolize in this drama?.
In this drama, a crucible would represent the constant building action leading to the climax of the pot.
What is crucible?
A crucible is a ceramic as well as metal vessel used to melt metals or subject other substances to extremely high temperatures. Crucibles can be made from any material that can withstand temperatures high enough to melt and otherwise change their contents, despite historically being most frequently made of clay. The crucible's shape has changed over time, with designs that take into account both regional variation and the process for that they are used. The earliest crucible forms date to Iran and Eastern Europe in the sixth or fifth millennia B.C.
Similar to the contents of a crucible, the characters seem to be constantly enduring severe trials; in this case, the witching trials. The crucible would, in my opinion, symbolize the town itself and its residents. The symbolism of this suggests a theme of the townspeople going through the witching trials and coming out with a "refined" lesson. The unnecessary accusations and trials will teach a hard lesson to the people who live within the town and influence their future.
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methanol is fairly volatile and evaporates quickly if spilled. methanol is also absorbed quite readily through the skin. if, in the laboratory, methanol accidentally spilled on your clothing, why would it be a serious mistake to just let it evaporate?
Letting the evaporation of methanol will be a mistake due to its toxic nature.
Methanol belongs to the functional group alcohol. Being volatile, it evaporates quickly. Moreover, it also absorbed quickly through the skin. The compound is highly toxic and the intake should be completely avoided.
Some of the common problems associated with methanol toxicity are different organs like respiratory system, Central nervous system and cardiovascular system along with metabolic acidosis. The symptoms of methanol poisoning are CNS depression, headache, confusion, dizziness, failure in muscle coordination. The metabolism of methanol into formic acid results in end organ toxicity which may be lethal.
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Consider the reaction
H2(g) + Cl2(g)2HCl(g)
Using standard thermodynamic data at 298K, calculate the entropy change for the surroundings when 2.41 moles of H2(g) react at standard conditions.
S°surroundings = J/K
The value of Δ[tex]S^{o}[/tex] for the surrounding when 2.41 moles of [tex]H_{2}[/tex] gas react at standard condition is 48.2 J/K.
What is entropy change and how to calculate it for the given equation?Entropy change can be defined as the difference between the entropies of all the reactants and products multiplied by the corresponding number of moles for each.
Δ[tex]S_{rxn}[/tex] = Σ(n × [tex]S_{product}[/tex]) - Σ(n × [tex]S_{reactant}[/tex])
where, n = number of moles
For the given reaction:
[tex]H_{2}[/tex](g) + [tex]Cl_{2}[/tex](g) = [tex]2HCl[/tex](g)
The standard absolute entropies (S) are:
[tex]H_{2}[/tex] = 131 J/K .mole
[tex]Cl_{2}[/tex] = 223 J/K .mole
[tex]HCl[/tex] = 187 J/K .mole
On putting these values in above equation for calculating entropy change:
Δ[tex]S_{rxn}[/tex] = 2 × 187 - (131 + 223)
Δ[tex]S_{rxn}[/tex] = 374−131−223 = 20 J/K .mole
Entropy change of the surroundings when 1 mole of [tex]H_{2}[/tex] reacts = 20 J/K .mole
Now, when 2.41 moles of [tex]H_{2}[/tex] react, the entropy change of surrounding can be calculated as = 20 × 2.41 = 48.2 J/K
Therefore, the value of Δ[tex]S^{o}[/tex] when given moles of [tex]H_{2}[/tex] react is 48.2 J/K.
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N2 gas is allowed to effuse through a porous membrane under constant pressure conditions. It takes 212 s for 1. 0 l of n2 gas to pass through the membrane. If it takes 337 s for 1. 0 l of an unknown gas to effuse through the membrane under identical conditions, what is the molar mass of the unknown gas?.
The molar mass of the unknown gas will be 70.75 g / mol.
What is graham law?
Graham's law states that the rate of diffusion or of effusion of a gas is inversely proportional to the square root of its molecular weight.
R1 / R2 = √ M2 / M1
= t2 / t1
Rn2/ R unknown = √ M unknown / Mn2
M unknown / 28gm/mol = t unknown / t N2
= 337 x 337 / 212 x 212 sec
= 337 x 337 x 28 / 212 x 218
= 70.75 gm / mol
The molar mass of the unknown gas will be 70.75 g / mol.
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what steps are necessary for finishing up a spectrophotometry experiment? select one or more: remove the sample from the sample chamber. throw out the cuvette. clean up around the spectrophotometer. turn off the light bulb.
Remove the sample from the sample chamber, turn off the light bulb and clean up around the spectrophotometer.
There are methods for determining the concentration of a sample. Here are our options. UV Photomedium The correct answer for the UV spectrum is all I need? This allows me to determine the concentration in the UV spectrum photometer. Absorption of visible light by compounds creates distinct spectra. Different spectrum is what it means. you can see what it looks like. Interaction bits are between light and matter. If a sample is given here and absorbs light, allowing an absorber to absorb it, a different spectrum will be seen.
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In terms of supplying sufficient quantities of drinking water, which of the following is the most important property of an aquifer?
low shrink-swell
low compressibility
high ion exchange capacity
low evaporation
high permeability (conductivity)
In terms of supplying sufficient quantities of drinking water, the most important property of an aquifer is high permeability.
Anything over which a person or a company has legal ownership is considered property. Property can refer to both real objects, like homes, automobiles, or appliances, as well as intangible items with the potential for future value, like stock and bond certificates.
Anything that someone, whether a person or a company, has a legal claim to is referred to be property. The owners have some enforceable rights over it because they have a legal title. It can fall into one of two categories: tangible or intangible. Automobiles, business equipment, furniture, and real estate are examples of tangibles.
Property Assets include any land, buildings, and all improvements thereon as well as any rights to the aforementioned.
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What is the approximate vapor pressure when the liquid water boils at about 50°C?
380 mmHg
760 mmHg
100 mmHg
5 mmHg
Answer:
380mmg
Explanation:
- 22. Which of the following CANNOT be done by a simple machine?
a. increase the amount of work done
b. change the direction of a force
c. decrease the time it takes to do the work
d. transfer energy from one location to another
Answer:
The answer is D
Explanation:
Hope this helps!
Can you please show all the steps with explanations.
The percentage purity of the chalk would be 88.82%.
What is percentage purity?The percentage purity of a compound is a measure of how pure the compound is.
In this case, the percent purity of the chalk is calculated as:
Percentage purity = mass of calcium carbonate/mass of chalk x 100%
From the equation of the reaction:[tex]CaCO_3 + 2 HCl --- > CaCl_2 + CO_2 + H_2O[/tex]
0.36 L of carbon dioxide was collected at STP.
Recall that: 1 mole of gas at STP = 22.4 L
Thus, 0.36 L of carbon dioxide at STP would be:
0.36/22.4 = 0.0161 mol
From the equation of the reaction, the mole ratio of carbon dioxide produced to calcium carbonate that reacted is 1:1. Thus, the equivalent mol of calcium carbonate that reacted would also be 0.0151 mol.
Molar mass of calcium carbonate = 100 g/mol
Mass of 0.0151 mol calcium carbonate = 0.0151 x 100
= 1.51 grams.
Percent purity of the chalk = 1.51/1.70 x 100
= 88.82%
The percentage purity of the chalk is, therefore, 88.82%.
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what is not true of fuels? group of answer choices they are found in three basic states they can only be volatilized and consumed in the liquid state * they are characterized as any substance that will burn or support combustion wood does not burn
The statement which is not correct about Fuel is that wood does not burn.
Hence, option D is not correct
What do you mean by Fuel?
Fuel can be defined as any substance that upon combustion produces a usable amount of energy which is generally known as fuel.The characteristics of good fuel includes that it should have a high calorific value, environment-friendly and should burn completely without leaving any residue. Fuel should be cheap and readily available. The burning of wood will include an indirect reaction.
Examples include : wood, coal, biogas, LPG, petrol, diesel etc.
Types of Fuels:
Solid Fuels.Liquid Fuels.Gaseous Fuels.Hence, The statement which is not correct about Fuel is that wood does not burn.
Hence, option D is not correct
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Ordinary hydrogen contains 99.30% of H atoms and 0.70% H atoms. Calculate the relative atomic mass of hydrogen.
The relative atomic mass of hydrogen 1.00
The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit
Here given data is
99.30% of H atoms
0.70% H atoms
So we have to calculate the relative atomic mass of hydrogen. = ?
So the relative atomic mass = (isotope abundance × isotope mass) + (isotope abundance × isotope mass)
Relative atomic mass = (99.30% × 1) + (0.70% × 1)
Relative atomic mass = 1.00
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Which manufacturing process is shown in the photograph? PLEASE HELP, I NEED THIS DONE BY TODAY :(
A. Combining
B. Finishing
C. Casting
D. Seperating
The manufacturing process shown in the photograph is d)Separating.
The cutting process in metals is a process where a piece of metal is cut into a desired shape or size. This can be done using a variety of methods, but the most common method is using a cutting tool. This eventually lead to the separation of the metals
Cutting processes are operations in which the work piece is cut into smaller pieces using power-driven cutting tools. A variety of cutting processes are used in metalworking, including machining, broaching, sawing, shearing, and abrading.
Each process has advantages and disadvantages, and the best process to use depends on the work piece material, the work piece geometry, and the desired tolerances.
Through these tools, the metals could be cut and separated easily. Hence the correct answer is option d)
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based on the periodic table, which of the following groups of elements should have very similar chemical properties?
Groups of elements that should have very similar chemical properties are:
Lithium (Li)Sodium (Na)Potassium (K)Correct Answer: letter C.
This is because they are all in the same column of the periodic table.
What is the name of the column where these elements are located?This column is called the alkali metals. The alkali metals are the elements in group 1 of the periodic table. They are all very reactive, due to the fact that they only have one valence electron in their outermost energy level. This makes them very prone to losing that electron, which is why they are often found in compounds rather than in their pure form. The most common alkali metal is sodium, which is found in table salt.
Based on the periodic table, which of the following groups of elements should have very similar chemical properties?
Group of answer choices:
A. potassium (K), aluminum (Al), neon (Ne)
B. carbon (C), iodine (I), hydrogen (H)
C. lithium (Li), sodium (Na), potassium (K)
D. manganese (Mn), magnesium (Mg), molybdenum (Mo)
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what is pressure define pressure
Pressure is a large and continuous force that is either exerted or given on or against an object or thing by something coming into contact with it.
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compounds that contain both carbonyl and alcohol functional groups are often more stable as cyclic hemiacetals or cyclic acetals than as open-chain compounds. examples of several of these are shown. deduce the structure of the open-chain form of each
In chemical reactions, there are open-chain compounds and closed-chain compounds. (Answer look at the picture)
Open-chain compounds (Aliphatic) are carbonate compounds with chains that do not meet between ends, saturated or unsaturated both branched and unbranched.
Closed-chain compounds is a term in chemistry used for compounds whose atoms are joined together to form rings. The number of elements making up the ring varies and is more than three. The elements that make up the cycle are also different from the elements carbon (carbon cycle), elements other than carbon (inorganic cycle), or both (heterocyclics).
Cyclic compounds can be called aromatic if they meet several conditions, namely:
Fat structure.Have conjugated or alternating π bonds.The carbon atoms that make up the ring are sp3 hybridized.Follow Huackel's Rule.Learn more about open-chain compounds at https://brainly.com/question/12947948
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