Iodoform reaction is the process of heating a chemical with an alkaline solution of iodine to produce a yellow precipitate. This test yields no results for methyl alcohol.
What is an alkaline solution?An alkaline solution is one that contains a soluble base and has a pH value greater than 7. Like NaOH. Additionally, it might be a base and water mixture. Numerous industrial applications exist for alkaline solutions.
Sodium hydroxide, potassium hydroxide, magnesium hydroxide, and calcium carbonate are a few examples of alkaline solutions. There are several uses for each of these solutions in various sectors.
The bottom line is that all you have to do to create an alkaline solution for a straightforward science experiment is mix baking soda and water. Baking soda should be measured. Your solution will get more alkaline as you add more baking soda.
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at the molecular level: a. create a question a researcher would ask at this level b. give an example of an experiment that could be done to answer questions at this level
In following way we can create the question:
How does dissolving a salt molecule in the water make its atoms ionize?
Dissolving a salt molecule in the water does not make its atoms ionize. The atoms in the solid salts are already ionized long before touching the water.
Electrons in an atom can only take on the specific wave states, and only one electron can occupy one wave state at a time. As a result, electrons in an atom take different states, starting from lowest energy state and going upwards in energy until the electrons have all found distinct states. For various reasons that are not worth mentioning here, electron states in the atoms tend to form various groups, with the states in the same group having very similar energies and states. Chemists call these groups of electron states "shells", even though they have nothing to do with the literal shells.
What is an electron?The electron is a subatomic particle (denoted by symbol e− or β−) whose electric charge is negative one elementary charge. Electrons belong to first generation of the lepton particle family, and are generally thought to be elementary particles because they have no known components or substructure. The electron's mass is approximately 1836 times smaller than that of proton. Quantum mechanical properties of electron include an intrinsic angular momentum (spin) of a half-integer value, expressed in units of the reduced Planck constant, ħ. Being fermions, no two electrons can occupy same quantum state, in accordance with the Pauli exclusion principle.
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Give the charge of the stable ion formed by each of the following. Include the sign (+ or -) and magnitude (numerical value) of the charge in every case. (Note: Give only the charge, not the formula of the ion.)
1. A group 2A metal
2. A group 3A metal
The charges on the ions are;
1. A group 2A metal - 2+
2. A group 3A metal - 3+
What is a charge?A charge could be positive or negative. We know that a positive charge is formed when there is an excess of protons compared to electrons in a specie. On the other hands, a negative ion is one in which there are more electrons than protons.
Now we know that metals mostly form positive ions. The magnitude of the charge on the ions depends on the group in the periodic table to which the metal belongs.
The charges on the ions are;
1. A group 2A metal - 2+
2. A group 3A metal - 3+
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annie learns that the compound sulfuric acid is called the universal chemical. the acid is used in everything from gasoline to paper. annie uses beads in three different colors to model sulfuric acid. based on the model, what is the chemical formula of sulfuric acid?
The compound Annie learns about that is sulfuric acid which is the universal solvent has a chemical formula of H2SO4.
What is the chemical formula of a compound?
The chemical formula of a substance serves as a representation of that substance's chemical make-up. The elements that make up a compound's molecules and the ratio in which their atoms combine to produce those molecules are described in a chemical formula.
The compositions of chemical compounds can be stated in a variety of ways, even though the phrase "chemical formula" is typically used to refer to the molecular formula of a compound, which represents the total number of atoms of each constituent element in one molecule of the compound.
Thus, the compound Annie learns about that is sulfuric acid which is the universal solvent has a chemical formula of H2SO4.
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Aluminum is a lightweight metal (density 2.70 g/cm3) used in aircraft construction, high-voltage transmission lines, and foils. what is its density in kg/m3?
The density of high voltage transmission lines, and foils = 2700 kg/m³
Converting :2.70 g/cm³ to kg/m³,
we use what's called "dimensional analysis" . But, really, it's just multiplying 2.70 g/ cm³ with converters.
Since we would like to convert g/cm³ to kg/m³, let's first recall that 1 kg = 1000 g, and 100 cm = 1 m .
Then, we just multiply:
[tex]\frac{2.70g}{cm^{3} }[/tex]× [tex]\frac{1 kg}{1000g}[/tex]×[tex]\frac{100cm}{m}[/tex]³
This works since 1kg/1000g is simply 1, same with 100cm/m. Also, note that the cm/m converter is cubed, since the first is cm³.
Then, (2.70) x (100)³ / (1000) = 2,700 kg/m³
Definition of dimensional analysis:
a way of analysis in which physical quantities are expressed in terms of their fundamental dimensions that is often used when there is not enough information to set up precise equations
What is dimensional analysis used for?dimensional analysis, technique utilized in the physical sciences and engineering to reduce physical properties, like acceleration, viscosity, energy, et al. , to their fundamental dimensions of length (L), mass (M), and time (T).
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Read the following information. Which statement describes the homes of the Southwest and Pacific Northwest Native American culture regions best? (3 points)
a Venn diagram comparing the Southwest and Pacific Northwest cultural regions. The Southwest says that they lived in a hot, dry area; they lived in multi-floor buildings made of clay, or in cone-shaped buildings; they wore clothing made of cotton or hides; they grew crops; the were known for weaving blankets, making dolls, and making pottery. The Both sections says they both hunted for meat; they both traded with other tribes; and many people lived together in one home in both cultural regions. The Pacific Northwest says they lived near the coast with lots of forests and rivers; they lived in long, rectangular wooden homes; they wore clothing made of fur or bark; they ate a lot of fish; they traveled in canoes; and they are known for carving totem poles and weaving baskets.
Group of answer choices
Homes in the Southwest and Pacific Northwest had many floors to fit many people.
Homes in the Pacific Northwest and Southwest were made from clay.
Homes in the Pacific Northwest and Southwest were made from wood.
Homes in the Southwest and Pacific Northwest were made from different materials.
Answer:
Homes in the Pacific Northwest and Southwest were made from wood
Explanation:
Carving wood was an essential cultural characteristic in the Southwest and Pacific NorthWest
consider the structures of the molecules below. are these molecules polar, nonpolar, or amphiphilic?
Compounds A and D are amphiphilic, compound B is nonpolar, and compounds C and E are polar.
What is amphiphilic?A chemical substance with both hydrophilic (polar, attracted to water) and lipophilic (attracted to fat) qualities is called an amphiphile (also known as an amphipath; from the Greek, amphis: both and, philia: love, friendship). Amphiphilic or amphipathic describes such a chemical. Soaps, detergents, and lipoproteins are examples of common amphiphilic compounds. Cell membranes' primary structural element is a phospholipid amphiphile.
Chemistry and biochemistry research, particularly that on lipid polymorphism, is based on amphiphiles.
Bolaamphiphilic refers to organic molecules with hydrophilic groups at both ends of the molecule. Prolate micelles are what they create in the aggregate.
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Hydrazine, N2H4 , has been used as a rocket fuel because its reaction with oxygen is extremely exothermic:
N2H4(l) + O2(g) -> N2(g) + 2H2O(g) H=-534.0kJ
The enthalpy change for the vaporization of water is given by:
H2O(l) -> H2O(g) H= 40.7kJ
Calculate the enthalpy change that would result if the water were produced in liquid rather than the gaseous form.
N2H4(l) + O2(g) -> N2(g) + 2H2O(l) H=?
Answer:
127
Explanation:
534-107
= 127
It's soo simple you just have to subtract valuew
One of the two amino acids that has a side chain including the modified carboxyl group, carboxamide, is _______________.
One of the two amino acids that has a side chain including the modified carboxyl group, carboxamide, is Asparagine.
Non-essential amino acid aspartic acid (Asp/D) has a carboxyl group in its Rgroup. Oxaloacetate is transaminase to easily create it. At physiological pH, the side chain of aspartic acid has a pKa of 3.9 and is negatively charged.
The side chain of the amino acid cysteine is chemically reactive and capable of forming bonds with other cysteines.
At this location, known as the side chain, each amino acid is joined to a different chemical group. Each amino acid differs from the others due to its side chain, which also gives it a distinctive set of chemical properties. The side chain is frequently referred to as a R group and is represented by the letter R.
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Convert 150 mg to grams
Answer: 0.15 grams
Explanation:
Answer: 0.15 grams
Explanation:
to convert milligrams to grams the mass value is divided by 1000, because there are 1000 mg in one g.
electrons may be in more than one orbital at once, due to the general possibility of superposition of quantum state
When an electron is superposed, its various states can be viewed as distinct outcomes, each with a specific chance of being observed.
What is Superposition ?Superposition is the ability of a quantum system to exist in multiple states simultaneously up until a measurement is taken. This fundamental principle of quantum mechanics is frequently illustrated through an experiment conducted in 1801 by the English scientist Thomas Young since the idea is challenging to grasp.
The positioning of one thing above or on top of another The law of superposition, which is extremely straightforward, is used to establish if one sedimentary rock is older than another.
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Complete the flowchart about the scientific method.
1.observation
2.hypothesis
3.Experiment
4 solution
5 theory
The independent variable
The dependent variable
using this indicator, we will attempt to determine the concentration of various acids depending on the amount of protons available for donation. using a single acceptor base (naoh), we will titrate the acid to the point where it turns pink, representing an equal mixture of acid and base.
Using phenolphthalein indicator, we will attempt to determine the concentration of various acids depending on the amount of protons available for donation. using a single acceptor base (naoh), we will titrate the acid to the point where it turns pink, representing an equal mixture of acid and base
An Phenolphthalein indicator is a ‘dye’ that shows a change in colour when in contact with acids and bases. This tells us whether the substance we are testing is an acid or base with respect to the change of colour. Phenolphthalein indicator when comes in contact with acid and base they give intense pink colour.
Phenolphthalein Colour in acid (pH < 7) give Colourless and Colour at pH = 7 also give Colourless, Colour in base(pH > 7) gives Pink colour that's why using Phenolphthalein indicator we will attempt to determine the concentration of various acids depending on the amount of protons available for donation. using a single acceptor base (naoh), we will titrate the acid to the point where it turns pink, representing an equal mixture of acid and base.
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If+28.0%+of+a+sample+of+silver-112+decays+in+1.52+hours,+what+is+the+half-life+of+this+isotope+(in+hours)?
28% decay means, 72% remains from the isotope.
Now,
N=N n ( 21 ) t/t 1 2
72=100( 21 ) t 1/2 1.52hr
( 100/72 )=( 21 ) t 1/2 1.52h
Taking long as both side & solving we get,
t 1/2 =3.21 hr
What is isotope?
Isotopes are two or more different atom types that share the same atomic number and place in the periodic table but have different quantities of neutrons in their nuclei, resulting in various nucleon numbers.
Therefore,
If+28.0%+of+a+sample+of+silver-112+decays+in+1.52+hours,+what+is+the+half-life+of+this+isotope+(in+hours)?
28% decay means, 72% remains
Now,
N=N n ( 21 ) t/t 1 2
72=100( 21 ) t 1/2 1.52hr
( 100/72 )=( 21 ) t 1/2 1.52h
Taking long as both side & solving we get,
t 1/2 =3.21 hr
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Identify a base that can be used to deprotonate propane (ch3ch2ch3) efficiently.
Identify a base that can be used to deprotonate propane (CH3CH2CH3) efficiently. А "NH2 B None of the given bases are suitable.
What is deprotonate propane?Deprotonation (or dehydronation) is the removal (transfer) of a proton (or hydron, or hydrogen cation), (H+), from a Brnsted-Lowry acid in an acid-base reaction. The species created is the conjugate base of that acid. Protonation is the complimentary procedure that occurs when a proton is added (transferred) to a Brnsted-Lowry base (or hydronation). The conjugate acid of that base is the species that results.
Amphiprotic refers to a species that has the ability to either take or contribute a proton. The H2O (water) molecule serves as an illustration. It has the ability to either gain a proton and produce the hydronium ion, H3O+, or lose a proton and form the hydroxide ion, OH.
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if 34.4 grams of pentane (c5h12) are burned in excess oxygen, how many grams of h2o will be produced?
If 34.4 grams of pentane ( C₅H₁₂) is burned in excess oxygen, 51.6 grams of H₂O will be produced.
The following reaction occurs when pentane is burned in the presence of excess oxygen,
C₅H₁₂ + 8O₂ = 5CO₂ + 6H₂O
We can observe from the above reaction that,
1 mole of C₅H₁₂ produces 6 moles of H₂O.
Hence,
72 g of C₅H₁₂ produces 108 g of H₂O
1 g of C₅H₁₂ produces 108/72 g of H₂O
34.4 g of C₅H₁₂ produces 108/72 x 34.4 g = 51.6 g of H₂O.
Therefore, if 34.4 grams of pentane ( C₅H₁₂) is burned in excess oxygen, 51.6 grams of H₂O will be produced.
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Which bonding type has circular symmetry with respect to the bond axis?
a) sigma bond
b) pi bond
c) delta bond
d) covalent bond
e) ionic bond
Sigma Bond has circular symmetry with respect to the bond axis
Sigma bonds are formed by head-on overlapping between atomic orbitals. These are the strongest type of covalent chemical bond. Pi bond are formed by the lateral overlap of two atomic orbitals. Delta bond is formed by the overlap of four lobes of one involved atomic orbital with four lobes of the other involved atomic orbital.
Covalent Bond is formed by equal sharing of electrons between two atoms. Ionic Bond is formed by the transfer of one or more electrons between atoms.
Sigma bonds are symmetric with respect to the inter-nuclear axis. They also have circular symmetry with respect to the bond axis.
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A solution containing a mixture of lactic acid and lactate was found to have a ph of 4.10.4.10. calculate the ratio of the lactate concentration to the lactic acid concentration in this solution.
The ratio is 1:4
pH of a solution is a measure of the hydrogen/hydronium ions present in it
pH = -log [ H+]
pH of lactic acid given is 4.10
∴ concentration of H+ ions in the solution is :
[H+] = 0.79 x 10^-5 mol
the Ka of lactic acid is 1.37 x 10^-4
lactic acid dissociates to form lactate ion and oxonium ion.
[lactate] = [ H+] = 0.79 x 10^-5 mol
[tex]Ka = \frac{[lactate][H+]}{[lactic acid]}[/tex]
[tex]1.37 x 10^-4 = \frac{(0.79 x 10^-5)^{2} }{Lactic acid}[/tex]
[lactic acid] = 2.195 x 10^-6 mol
[tex]\frac{[Lactate]}{[Lactic Acid]}[/tex] = 1 : 4 (approx)
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Calculate the frequency of a wave with a wavelength is 6.0 x 10-7 m.
The frequency of a wave with a wavelength of 6.0 x 10-⁷m is 5.0 × 10¹⁴Hz.
How to calculate frequency?The frequency of a wave can be calculated by dividing the wavelength by its wavelength as follows:
f = v/λ
Where;
f = frequencyv = speed of light (3 × 10⁸m/s)λ = wavelengthAccording to this question, a wave has a wavelength of 6.0 x 10-⁷m. The frequency can be calculated as follows:
f = 3 × 10⁸ ÷ 6.0 × 10-⁷
f = 5.0 × 10¹⁴Hz
Therefore, the frequency of a wave with a wavelength of 6.0 x 10-⁷m is 5.0 × 10¹⁴Hz.
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write the symbol for every chemical element that has atomic number greater than 70 and atomic mass less than 179.5 u
The elements and there symbols are as follows: Oxygen ⇒ O fluorine ⇒ F Neon ⇒ Ne Sodium ⇒ Na.
What is Oxygen ?When a hydrogen atom loses or receives an electron, a hydrogen ion is produced. A positively charged hydrogen ion (or proton) can combine with other particles easily, therefore it is only observed alone when it is in a gaseous condition or a place that is almost particle-free.
The bare hydrogen ion cannot live freely in solution due to its extremely high charge density, which is approximately 21010 times that of a sodium ion. Instead, it rapidly hydrates, or binds, with other molecules. The IUPAC recommends using the phrase "hydrogen ion" to refer to all hydrogen ions and its isotopes. Positively charged ions and negatively charged ions can be divided into two classes based on the ion's charge.
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An extra-strength aspirin contains 0.500 g of aspirin. how many grains is this? (1grain=64.8mg)
By unit conversion, the aspirin contains 7.72 grains.
We need to know about unit conversion to solve this problem. The unit conversion can be used to convert a unit to another unit. It can be defined as
a = xb
where a is unit a, b is unit b and x is the constant of conversion.
From the question above, we know that
m = 0.5 gram
unit conversion
(1 grain = 64.8 mg)
Convert the unit conversion to 1 mg
1 grain = 64.8 mg
1/64.8 grain = 64.8/64.8 mg
1 mg = 1/64.8 grain
Convert the aspirin mass to grain
m = 0.500 g
m = 0.5 x 10³ mg
m = 0.5 x 10³ x 1/64.8 grain
m = 7.72 grain
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Using the information below, find how many minutes are in 0.56 yrs.
1 day = 24 hrs
1 yr = 365 days
1 hr = 60 min
There are 294,336 minutes are in 0.56 yrs.
Minutes are a reputable recording of the court cases of a Board meeting Annual fashionable meeting or another meeting and the enterprise transacted on the meeting.
1 yr = 365 days
0.56 = 365 × 0.56
= 204.4 days.
1 day = 24 hrs
204.4 days = 204.4 × 24
= 4905.6 hours
1 hr = 60 min
4905.6 hours = 4905.6 × 60
= 294,336 minutes.
All agencies registered in India are required to maintain mins of all Board and Committee conferences in a minutes e-book. minutes may be created during the meeting with the aid of a typist or courtroom reporter, who might also use shorthand notation and then prepare the minutes and problem them to the contributors afterward.
Minutes are a tangible report of the meeting for its contributors and a source of facts for members who had been not able to wait. In a few cases, assembly mins can act as a reference point, as the instance when a meeting's outcomes affect different collaborative activities or initiatives inside the corporation
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Consider the structure of vitamin a1 c.o't''e~'ll (c2oh3oo). vitamin a1 should be:________
Consider the structure of vitamin a1 c.o't''e~'ll (c2oh3oo). vitamin a1 should be less soluble in water than in oil.
What is structure of vitamin?
Vitamins perform a variety of biological processes. The proliferation and differentiation of cells and tissues is regulated by vitamin A. Vitamin D performs a hormone-like function by controlling how quickly bones and other organs use minerals. The B complex vitamins serve as cofactors (coenzymes) for enzymes or as their precursors.
Therefore,
Consider the structure of vitamin a1 c.o't''e~'ll (c2oh3oo). vitamin a1 should be less soluble in water than in oil.
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The table shows the substances used during a science experiment. Which substances are elements?HELP ME PLS!
Answer:What are 10 elements examples?
Examples
H - Hydrogen.
He - Helium.
Li - Lithium.
Be - Beryllium.
B - Boron.
C - Carbon.
N - Nitrogen.
O - Oxygen.
Explanation:
Set the total electron capacity to:
c). a 3p orbital.
Answer:
6e
Explanation:
Number of orbitals in each subshell:
S - 1
P - 3
D - 5
F - 7
The number of orbitals increases by 2
Subshell p has 3 orbitals, each orbital can hold up to 2 electrons. Therefore, 3p has an electron capacity of 6.
**Note: The number 3 in 3p only represents the shell number and does not influence the electron capacity.
the flavor and odor of fruits comes primarily from the esters they contain. for example, a major component in the flavor of oranges is octyl acetate. draw the organic products formed when octyl acetate reacts with aqueous sodium hydroxide. omit any na ions, if applicable. the starting material is a carbonyl bonded to methyl and an oxygen bonded to an 8 carbon chain. this reacts with n a o h and water to form the products.
The organic product formed when octyl acatate reacts with sodium hydroxide is octan-1-ol and sodium acetate.
CH3COOCH2CH2CH2CH2CH2CH2CH2CH2(Octyl acetate) + NaOH
------> HOCH2CH2CH2CH2CH2CH2CH2CH2(Octan-1-ol) +
CH3COONa
What is ester?
By mixing an oxoacid with a hydroxyl molecule, such as alcohol or phenol, esters are chemical compounds that are created. Esters are used often. The majority of fats and oils that are produced spontaneously are fatty acid esters of glycerol.
Ester examples are fats and oils. The melting point of their esters distinguishes them from one another. The ester is thought of as an oil if its melting point is lower than room temperature.
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consider the aldol condensation between dibenzyl ketone and benzil in strong base. a reaction was performed in which 0.28 g of dibenzyl ketone was reacted with 0.28 g of benzil to make 0.34 g of 2,3,4,5‑tetraphenylpentadienone. calculate the theoretical yield and percent yield for this reaction.
In organic chemistry, an aldol condensation is a condensation reaction in which an enol or enolate ion combines with a carbonyl chemical to produce a -hydroxyaldehyde or -hydroxyketone, which is then dehydrated to produce a conjugated enone.
Aldol condensations are significant in the synthesis of organic compounds because they offer a reliable method for forming carbon-carbon bonds. Aldol condensation, for instance, occurs during the Robinson annulation reaction sequence, and the Wieland-Miescher ketone product is a crucial building block in numerous chemical syntheses. Aldol condensations are frequently studied as a useful bond-forming reaction that exemplifies significant reaction mechanisms in university-level organic chemistry coursework. in the standard form.
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Find the radius of a cylindrical can (with a lid) to contain 2197 cm3 of water, using the minimum amount of metal. (use symbolic notation and fractions where needed.)
The radius of the cylindrical can is [tex]\sqrt{699.682/h}[/tex]
A cylinder's radius is equal to the distance from the cylinder's center to its edge, which are located at its top and bottom.
A three-dimensional object known as a cylinder is a hollow rod with rounded ends. This circular base's diameter can change, and the radius is equal to half of that value.
A cylinder's radius (r) is equal to [tex]\sqrt{V/\pi h}[/tex], where V denotes the cylinder's volume, h its height, and π (Pi) is a mathematical constant having a value of around 3.14.
Given:
Volume = 2197[tex]cm^3[/tex]
Formula:
Volume, V = π x radius, [tex]r^2[/tex] x height, h
Calculations:
[tex]r^2[/tex] = 2197 / 3.14 x h
[tex]r^2[/tex] = 699.682 / h
Radius, r = [tex]\sqrt{699.682/h}[/tex]
Result:
[tex]\sqrt{699.682/h}[/tex] is found to be the radius of the cylindrical can.
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Indicate which alcohol in each pair will undergo an elimination reaction more rapidly when heated with h2so4.
Indicate which alcohol in each pair will undergo an elimination reaction more rapidly when heated with H-SO CH2OH CH CH2OH он OH.
What is alcohol ?Ketones, aldehydes, and carboxylic acids can be produced when alcohol is oxidized. These functional groups can be used to additional processes; for instance, carboxylic acids can be used for esterification, while ketones and aldehydes can be applied to subsequent Grignard reactions. When an organic compound is oxidized, more bonds from carbon to oxygen (or another electronegative element, like a halogen), and possibly fewer links to hydrogen, are formed.
Secondary alcohols can be efficiently oxidized up to the ketone stage without rupturing carbon-carbon bonds. Except in extremely restricted circumstances, no more oxidation is visible. Tertiary alcohols cannot be oxidized at all without rupturing carbon-carbon bonds, in contrast to primary alcohols, which can be converted to aldehydes or further converted to carboxylic acids.
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Which is an example of potential energy?
A
Water behind a dam
B
A dart stuck in a dartboard
C
Plants using photosynthesis
D
A cow chewing grass
The example of Potential energy is the water behind a dam.
Due to its higher elevation than the water on the other side of a hydroelectric dam , the water behind one stores gravitational potential energy. This potential energy is transformed into kinetic energy when the water falls, turning turbines to produce electricity.
The water held behind the dam has Potential Energy because of its position water in the reservoir is on height and when something is on a certain height the Potential Energy P.E. increases.
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What molecular features are required for soap to properly dissolve grease and oil?
The soap molecule has two distinct ends, one that is hydrophilic (polar head) that ties with water, and the other that is hydrophobic (non-polar hydrocarbon tail) that secures with grease and oil.
Is the hydrophobic tail polar or non-polar?Per lipid, a molecule includes two parts; a head and a tail. The head is polar and hydrophilic ( Water loving) and the rears are non-polar and hydrophobic( Water hating).
Are hydrocarbon rears hydrophobic?The most productive membrane lipids are the phospholipids. These have an opposing head group and two hydrophobic hydrocarbon tails. The tails are fatty acids, and they can vary in size (they normally contain between 14 and 24 carbon atoms).
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