Peptide bonds, hydrogen bonds, disulfide linkages, van der Waals, and electrostatic forces of attraction are the chemical bonds that stabilize the different structures in primary, secondary, tertiary, and quaternary structures.
The advanced structure of proteins gives rise to two kinds of major molecular shapes which are fibrous as well as globular structures. The main forces which are involved in stabilizing the secondary along with the tertiary structures of proteins include hydrogen bonds, disulfide type linkages, van der Waals attraction, and electrostatic forces of attraction.
The primary structure is generally determined by adjoining peptide bonds where the link is adjoining amino acids in sequential order. Tertiary structure is determined by the existence of disulfide bonds in between hydrophobic interactions as well as cysteine residues whereas the quaternary type structure is determined by multiple subunits of a protein that undergo various interactions.
Hydrogen bonds exist in a protein molecule as its large number can form between adjacent regions of the polypeptide chain in folded form and stabilize its three-dimensional kind of shape.
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Does your melting point obtained for your product indicate that your sample is indeed benzoin or hydrobenzoin?
The melting points of the products obtained ranged from 135 to 137, indicating that the compound is probably benzoin since the melting points of the products are very similar to those of benzoin (135 to 137). The melting point range of benzoin is closer to the product than that of hydroxybenzoic acid.
Benzoin is the sap (gum resin) that comes from cuts withinside the trunk of bushes that belong to the Styrax family. Benzoin is used at the pores and skin for ulcers, mattress sores (strain ulcers), cracked pores and skin, and lots of different conditions, however, there may be no correct medical proof to aid those uses.
Benzoin is on occasion referred to as gum benzoin or gum benjamin, and in India Sambrani or loban, aleven though loban is, thru Arabic lubān, a frequent time period for frankincense-kind incense, e.g., aromatic tree resin. Benzoin is likewise referred to as storax, now no longer to be harassed with the balsam of the equal call acquired from the Hamamelidaceae family.
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ASAPPP MAKE SURE ITS NOT COPY N PASTE PLS
Ions are any molecules that have a charge. (positive or negative.) Group 1 atoms have 1 valence electron, so their ions are formed by giving away one electron. Group 7 atoms have 7 valence electrons, so their ions are formed by gaining one electron. This process gives the atom a full shell of 8, which makes it stabilized.
A 33.9g sample of lead is placed in a graduated cylinder containing 20.0mL of water.
The lead sinks to the bottom. If the density of lead is 11.4g/cm³, what will the final
volume read on the graduated cylinder?
The correct answer for the final volume read on the graduated cylinder = 4.72 ml ^3 .
density of lead is 11.4g/cm³,
quantity of water = 20.0 mL = 20 gram
sample of lead = 33.9 g
density = mass / volume
total mass = 20+ 33.9 = 53.9
volume = mass/ density
volume = 53.9/ 11.4
volume = 4.72 ml ^3
Graduated cylinders are long, slender vessels used to measure liquid volumes. They are not meant to be mixed, stirred, heated, or weighed. Graduated cylinders typically range in size from 5 mL to 500 mL. It is a tall narrow container with a volume scale used specifically for measuring liquids. These 100 mL glass graduated cylinders are used to accurately and easily measure and dilute liquids! These class-A, lab-quality graduates are built to deliver precise measurements while resisting breakage and a wide range of chemicals. A plastic volume marker is included.
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In Niels Bohr's model of the atom, electrons move like _____ orbiting the _____.
Answer:
protons and neutrons
Explanation:
because Neil bohr had described this is his theory
Answer:
hope this help
Explanation:
In Bohr's model, electrons moved around the atomic nucleus in circular orbits, but those orbits had set discrete energies, and electrons could gain or lose energy only by moving from one orbit to another, absorbing or emitting radiation as necessary.
how many grams of iron will be needed to react completely with an excess of oxygen to form 40 grams of iron oxide ?
Answer:
28g Fe
Explanation:
source: https://www.answers.com/Q/How_many_grams_of_iron_will_be_needed_to_react_completely_with_an_excess_of_oxygen_to_form_40_grams_of_iron3_oxide
Which is the best carbon-14 radioisotope-labeled compound to add to a cell culture as a means for tracking the products of transcription?
Best carbon-14 radioisotope-labeled compound to add to a cell culture as a means for tracking the products of transcription 14C ribose.
Carbon-14, the longest-lived radioactive isotope of carbon, whose decay allows the accurate dating of archaeological artifacts. C-14 is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.it is mostly found in atmospheric carbon dioxide because that is where it is constantly being produced by collisions between nitrogen atoms and cosmic rays.
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During the breakdown of fatty acids, not all acetyl coa enters the citric acid cycle, and your body converts some acetyl coa to?
During the breakdown of fatty acids, not all acetyl CoA enters the citric acid cycle, and your body converts some acetyl CoA to ketone bodies.
Acids are molecules or ions that can donate protons, known as Bronsted-Lowry acids, or form covalent bonds with electron pairs, known as Lewis acids. The first category of acids is proton donors or Brønsted-Lowry acids.
Blood is normally slightly alkaline, with a normal pH range of about 7.35 to 7.45. Normally, the body keeps blood pH near 7.40. Doctors measure a person's acid-base balance by measuring the pH of the blood and the levels of carbon dioxide (acid) and bicarbonate (base). No oil is either an acid or a base. Neutral. Oil is a neutral, nonpolar chemical. That is, it is a viscous liquid at room temperature. It is immiscible with water, but soluble in alcohol and ether.
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What are functionalized hydrocarbons? cite an example of a functionalized hydrocarbon
In functionalized hydrocarbons, a functional group is attached to the core of hydrocarbons (alkanes, alkenes, alkynes). Some examples are methanol (where the hydroxyl group is attached to methane) and it belongs to the chemical class of alcohols.
In organic chemistry, hydrocarbons are organic compounds made entirely of hydrogen and carbon. Hydrocarbons are examples of Group 14 hydrides. Hydrocarbons are generally colorless and hydrophobic, and their odor is usually faint or exemplified by the liquid odor of gasoline or lighters.
Examples of hydrocarbons include gasoline, kerosene, lamp oil, and furniture oil. If someone accidentally drinks a hydrocarbon product that gets into their lungs, it can cause breathing problems. Severe injury or even death can result. Crude oil is a mixture of relatively volatile liquid hydrocarbons (compounds composed primarily of hydrogen and carbon), but it also contains nitrogen, sulfur, and oxygen.
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The reaction of benzaldehyde with acetone and sodium hydroxide produces ____________ This is an example of ____________ reaction.
The reaction of benzaldehyde with acetone and sodium hydroxide produces DibenzalacetoneThis is an example of an aldol condensation reaction.
A physical reaction is a reaction in which a change in the physical properties of matter or substances occurs. Physical properties include density, mass, and volume. The definition of a physical reaction is a reaction in which molecules undergo molecular rearrangements but do not change chemically.
A response, although technically a reaction, takes into account the desired outcome of the interaction. Reactions can produce positive or negative results, but reactions are designed to produce positive or negative results. To react is emotional, to react is emotional intelligence.
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Ionic compounds are different from covalent compounds because they do not share electrons is it true or false
Ionic compounds are formed from ionic bonds which occur when there is electron transfer, while covalent compounds share electrons. Hence, the answer is true.
What are covalent compounds?Covalent compounds are compounds formed by covalent bonds. Atoms form compounds to achieve a stable electronic configuration. Covalent compounds do this by sharing their electrons. Covalent bonds are weaker than ionic compounds and mostly form gases.
What are ionic compounds?Ionic compounds achieve the stable electronic configuration of noble gases by gaining or giving away their electrons. When this happens, the atoms get attracted to each other by electrostatic forces. Atoms that give away their electrons become positively charged cations and atoms that receive electrons become negatively charged anions.
Therefore, the major difference between ionic compounds and covalent compounds is that covalent compounds share electrons and ionic compounds transfer electrons.
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When the difference between a measured value and the known value is expressed as percentage error, it is usually written as
When the difference between a measured value and the known value is expressed as a percentage error, it is usually written as either negative or positive.
How do introduce differences in measured values?The accepted terminology to introduce differences in measured values during experimentation and data collection is to introduce this difference with the sing based on the first data (either positive or negative).
In conclusion, when the difference between a measured value and the known value is expressed as a percentage error, it is usually written as either negative or positive.
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An oxygen molecule at 25◦C has a speed of
about 678 meters per second. Express this
speed in miles/hour. (1 mi = 5280 ft)
1. 0.000659 miles/hour
2. 0.421 miles/hour
3. 0.000117 miles/hour
4. 2440000 miles/hour
5. 9780 miles/hour
6. 15200 miles/hour
7. 1520 miles/hour
An oxygen molecule at 25◦C has a speed of 1520 miles/hour.
Equation :As we know
1 km = 1000 meter
So,
678 / 1000 = 0.678 km
And 1 mile = 1.6 km
So,
0.678 / 1.609 = 0.4213 miles
We know that 1 hour = 60×60 = 3600 sec
So,
1 sec = 1 / 3600
= 2.777 x 10⁻⁴ hour
Now finding speed,
speed = distance / time
speed = 0.4213 / 2.777 x 10⁻⁴
speed = 1520 miles/hour
What is speed ?Velocity is the rate and direction of an object's movement, whereas speed is the time rate at which an object is moving along a path. In other words velocity is a vector value, whereas speed is a scalar value.
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25.0 ml is taken from a stock solution of concentration 14.9 g/l and added to a 250.0 ml volumetric flask and diluted up to the calibration mark. what is the new concentration (in grams per liter)?
If 25.0 ml is taken from a stock solution and added to volumetric flask and diluted up to the calibration mark, then the new concentration will be 1.49 g/L.
Now, Concentration of solution is defined as amount of solute present in specific volume of the solution.
Molarity (M) = moles of solute ÷ litres of solution
Here, the concentration of solution is given as, 14.9 g/l
and, the volume of solution is 25.0 ml= 0.025 l
using the equation,
14.9 = moles of solute ÷0.025
moles of solute = 0.3725 moles
0.025 l is added to a 0.25 l (250.0 ml =0.25 l) volumetric flask and diluted up to the calibration mark.
Since,
volume of solution = volume of flask
And, moles of solute remains the same.
Therefore,
The new concentration is,
concentration = (0.3725 ÷ 0.25) g/l
New concentration = 1.49 g/l
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What type of molecule is shown below?
Answer:
It is an alkene
Explanation:
First, this is a hydrocarbon because it has only carbons and hydrogens. Second, we see the C=C which is a double bond. Double bonds between carbons make it an alkene.
How many isomers of which type can be drawn to represent the chemical formula c5h12?.
3 structural isomers can be drawn to represent the chemical formula C5H12.
When two or more organic compounds have the same molecular formula but different structures, they are said to be structural isomers, also referred to as constitutional isomers. The two molecules below share the same chemical formula, however they are distinct due to variations in the methyl group's placement.
It is an alkane, C5H12. There are 2 to the power (n-4)+1 isomers of an alkane, where n is the number of carbon atoms. Therefore, there are three structural isomers that might exist for C5H12 using the formula. They are methyl butane, n-pentane, and isopentane (dimethyl propane).
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Which pair of elements do you expect to be most similar?
a. mo and sn cl and f si and p k and sr n and ni
Among the pair of elements given, Cl and F are expected to be the most similar.
On the basis of periodic table,
Cl and F are in the same group which is the halogen group. Thus, they possess similar properties.Of the choices provided, Chlorine (Cl) and Fluorine (F) are the only pair located in the same group while the others belong to different groups in periodic table.
Nitrogen have symbol N and belongs to main group element while Nickel have symbol Ni and belong to transition element. Therefore, they are not similar.
Molybdenum have symbol Mo belongs to transition element and Tin have symbol Sn belongs to main group element possessing different properties.
Sodium have symbol Na and classified as alkali metal while Magnesium have symbol Mg, classified as alkaline earth metals. They do no have similar properties.
Silicon having symbol Si is a metalloid while Phosphorus having symbol P is a non-metal. Thus, they are not similar.
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what are 3 main ways an object can accelerate
Answer:
There are following three ways in which a object can accelerate....
1...speeding up
2.... slowing down
3... changing direction
hope it help you✌✌✌✌✌
Explanation:
Nitrogen gas is the major component of air. a sample of nitrogen gas in a glass bulb weighs 243 mg. what is this mass in si base units of mass (kilograms)?
Nitrogen gas is the major component of air. a sample of nitrogen gas in a glass bulb weighs 243 mg. 2.43 × 10-4 kg is this mass in si base units of mass (kilograms).
Nitrogen, or N, using its scientific abbreviation, is a colorless, odorless element. Nitrogen is in the ground under our feet, in the water we drink, and in the air, we breathe. In fact, nitrogen is the most abundant element in the Earth's atmosphere, with approximately 78% of the atmosphere being composed of nitrogen.
Nitrogen is commonly used during sample preparation for chemical analysis. Used to concentrate and reduce the volume of liquid samples. Nitrogen is also important for the chemical industry. It is used in the production of fertilizers, nitric acid, nylon, dyes, and explosives*. Exposure to very high concentrations of pure nitrogen can cause dizziness, drowsiness, displacing oxygen from the air, unconsciousness, and death.
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Discuss two properties of the atomic structure of copper that make it a good conductor.
The two properties of the atomic structure of copper that make it a good conductor is:
In copper, there is enough heat energy at ordinary room temperatures to liberate a vast number of weakly held valence electrons. The presence of a large number of free electrons in copper, as in other metals, is what makes it a good conductor of electricity.In copper, at normal room temperature, there is enough thermal energy to eject a large number of weakly held valence electrons. Like other metals, copper has a large number of free electrons, which makes it a good conductor of electricity.
In order for current to flow through metal, the current source must fight resistance. The lower the resistivity, the higher the electrical conductivity of the metal. Copper wire is also a good electrical conductor due to its low resistivity.
Other materials sometimes used as conductors are silver, gold, and aluminum. Copper is still the most popular material for wire because it is a very good conductor of electricity and is very cheap compared to gold and silver.
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How many grams of glucose (c6h2o6 molecular mass =180 daltons) would be present in one liter of a 1 m (molar) solution of glucose?
There are 180 grams of glucose in 1 liter of a 1 M solution.
What do we know about glucose?Blood sugar, often known as glucose, is the main sugar found in your blood. It comes from the food you eat and is used as your body's main energy source. Your blood supplies glucose to all of the cells in your body, which then uses it as fuel.
Diabetes is a disorder when your blood sugar levels are too high.
moles = volume x molarity
moles = 1 L x 1 mol/L = 1 mol
mass = moles x molecular weight
mass = 1 mol x 180 g/mol = 180 g(we know that 180 daltons = 180 g/mol)
Therefore, 1 litre of a 1 M solution has 180 grammes of glucose.
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There are 180 grams of glucose in 1 liter of a 1 M solution.
Calculating:
moles = volume x molarity moles
= 1 L x 1 mol/L = 1 mole mass
= moles x molecular weight mass
= 1 mol x 180 g/mol = 180 g(we know that 180 daltons = 180 g/mol)
Therefore, 1 litre of a 1 M solution has 180 grams of glucose
What can we know about glucose?
Blood sugar, often referred to as glucose, is that the main sugar found in your blood. It comes from the food you eat and is employed as your body's main energy source. Your blood supplies glucose to all or any of the cells in your body, which then uses it as fuel.
Diabetes may be a disorder when your blood sugar levels are too high..
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When water is added to a compound in a chemical equation, a new compound can be formed via?
When water is added to a compound in a chemical equation, a new compound can be formed via hydrolysis.
What is hydrolysis?It refers to any chemical process when a water molecule breaks one or more chemical bonds. When water is the nucleophile, the phrase is used generically to refer to substitution, elimination, and solvation processes.
The cleavage of biomolecules known as biological hydrolysis occurs when a water molecule is consumed in order to cause the division of a bigger molecule into its component parts. Scarification is the process of hydrolyzing a carbohydrate into its individual sugar molecules, as occurs when sucrose is broken down into glucose and fructose.
A condensation reaction, in which two molecules combine to form a bigger one and expel a water molecule, can be reversed by a hydrolysis reaction. Thus, condensation builds up by removing water, but hydrolysis breaks down by adding water.
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How many potassium ions are in 5.66 g of potassium sulfate: k2so4 (mw. 174.27 g/mol)?
There would be 3.91 ×10²² potassium ions in 5.66 g of potassium sulfate.
What is a molecule?A molecule is the smallest unit of a substance that retains its composition and properties. It is made up of two or more atoms that are joined together by chemical bonds.
The number of moles of the k2so4 = mass/molecular mass
=5.66 /174.27
=0.032478 moles
The number of the potassium ion in k2so4 = 2 ×0.032478×6.022 ×10²³
=3.91 ×10²² ions
There would be 3.91 ×10²² potassium ions in 5.66 g of potassium sulfate.
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Elements a and q form two compounds, aq and a2q3. the mass ratio (mass q)/(mass a) for aq is 0.574. what is the mass ratio (mass q)/(mass a) for a2q3?
The mass ratio (Mass of Q/ Mass of A) of the compound A₂Q₃ is 0.861.
mass ratio is a degree of the performance of a rocket. It describes how a lot greater big the car is with propellant than with out; this is, the ratio of the rocket's moist mass (vehicle plus contents plus propellant) to its dry mass (car plus contents). A extra green rocket layout calls for less propellant to gain a given intention, and would consequently have a lower mass ratio; but, for any given efficiency a better mass ratio usually permits the vehicle to obtain higher delta-v.Given,
The mass ratio (mass Q)/(mass A) for AQ is 0.574
We have to find the mass ratio (mass Q)/(mass A) of A₂Q₃.
The mass ratio for A₂Q₃ is
Mass of Q/ Mass of A = 3 × mass Q/ 2 × mass A
Or, Mass of Q/ Mass of A = (3/2) × (mass Q/ mass A)
Or, Mass of Q/ Mass of A = (3/2) × 0.574
Or, Mass of Q/ Mass of A = 0.861.
Therefore, the mass ratio for (Mass of Q/ Mass of A) for A₂Q₃ is 0.861.
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A chemical reaction in which bonds are created is usually associated with ________.
A reaction in which bonds are created is usually associated with the Release of energy.
What are the various types of bonds?
There are three sorts of bonds:
1. Electrovalent or electrovalent bond
2. chemical bond
3. dative bond
Electrovalent or electrovalent bond are formed when one or more electrons are transferred from one atom to another.
Covalent bonds are formed when the atoms during a molecule share an equal number of electrons.
A dative bond is one in which both electrons in a shared pair come from the same atom.
Now, atoms tend to stabilize once they form chemical bonds, releasing energy within the process. Energy is released because there's a higher level of stability associated with a low energy level.
Hence, a reaction in which bonds are created is usually associated with the release of energy.
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Does the density of an object change if only the volume changes? Why or why not?
Yes, the density of an object change if only the volume changes because density is an intensive property.
What is density?Density is the measure of the mass of matter contained by a unit volume.
This suggests that the density of a substance is a function of the mass and volume of the substance.
However, an increase in volume decreases the overall density of an object, making it float.
Therefore, yes, the density of an object change if only the volume changes because density is an intensive property.
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What is the name for a material with a free electron in its valence ring that allows electricity to flow freely?
Answer:
conductor
Explanation:
if 45.98 g of sodium combines with an excess of chloride gas to form 116.89 g of sodium chloride, what mass of chlorine gas is used in the reaction
The ionic compound sodium chloride, also referred to as salt, has the chemical formula NaCl, which denotes a 1:1 ratio of the ions sodium and chloride. The molar weights of 39.34 g Na and 60.66 g Cl in 100 g of NaCl are 22.99 and 35.45 g/mol, respectively.
If 45.98 g of sodium combines with an excess of chloride gas to form 116.89 g of sodium chloride, what mass of chlorine gas is used in the reaction?
116.89 g – 45.98 = 70.91 g of chlorine must have been used.
The characteristics of sodium and chlorine are as follows:
Water and sodium react violently.The gas chlorine is toxic.Soft and silvery-white sodium metal.Metals are corrosive to chlorine gas.The characteristics of the chemical sodium chloride are as follows:
in water dissolves.Non-poisonous.both crystalline and whiteIn light of this, it may be said that sodium chloride possesses wholly unique properties from those of sodium and chlorine.
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Jimmy runs fast, but he wants to run faster. He sees a commercial for a new type of sneaker that says they can make you run faster and jump higher because of how they are made. Jimmy goes and buys the new sneakers and then times how long it takes him to run one mile in his new sneakers. The next day, he puts his old sneakers back on and times how long it takes him to run one mile in his old sneakers. In his old sneakers he ran the mile in 8 minutes and 12 seconds. In his new sneakers he ran the mile in 7 minutes and 46 seconds. what is the hypothisis
What is the main precaution to take if a gas cylinder sign is present in the lab? select one
The main precautions to take if a gas cylinder sign is present in the lab visually check that the gas cylinder is restrained, but keep a safe distance from it. The correct option is c.
What are the precautions?Precautions are the preventive steps that are taken to save yourself from any dangerous circumstances. These steps are always taken in doing experiments and other scientific procedures.
Here, the precautions are to check the gas cylinder.
Thus, the correct option is c, Visually check that the gas cylinder is restrained, but keep a safe distance from it.
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The question is incomplete. Your most probably complete question is given below:
Remove the strap from around the gas cylinder to use it in the lab.
Open the valve on the gas cylinder periodically to release pressure.
Visually check that the gas cylinder is restrained, but keep a safe distance from it.
Test out the regulator on the gas cylinder to make sure it is working properly.
2
The melting and boiling points of three pure
substances are given in Table 1.3.
Substance
ethanol
methane
mercury
Melting point
/°C
b
c
-117
-182
-30
Boiling point
/°C
78
-164
357
Table 1.3: Melting and boiling points of ethanol,
methane and mercury.
All three substances have negative values for
their melting point. Which of them has the
lowest melting?
Answer:
-182
Explanation:
according to the table it's the answer
According to forces of attraction and given data the substance with lowest melting point is that one with -182°C.
Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.Thus,the substance with lowest melting point is that one with -182°C.
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