Answer:
red
Explanation:
Can someone help me please
Answer: I believe the answer is B
what type of bonding orbital is always formed between hydrogena nd another atom in a covalent compound
When hydrogen forms a covalent bond with another atom, it typically forms a sigma (σ) bond. A sigma bond is a type of covalent bond.
A sigma bond is a type of covalent bond that is formed by the overlap of atomic orbitals along the axis connecting the two atoms. Sigma bonds are the strongest and most stable types of covalent bonds, and they are responsible for the majority of the bonding in most molecules.
In the case of hydrogen, the sigma bond is formed by the overlap of the 1s orbital on the hydrogen atom with an orbital on the other atom. The 1s orbital is the lowest energy orbital on the hydrogen atom and is characterized by a spherical shape. When hydrogen forms a covalent bond with another atom, the sigma bond is typically the only bond that is formed. It is important to note that hydrogen can also form other types of bonds, such as pi (π) bonds, which are formed by the overlap of atomic orbitals perpendicular to the axis connecting the two atoms. However, these types of bonds are less common and are typically weaker than sigma bonds.
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what is the molar concentration of na ions in 0.0200 m solutions of the following sodium salts in water?
The molarity of Na+ ions in a 0.0200 M solution of a given sodium salt is:
For NaBr, Molarity of Na+ ions = 0.020 M
Molality of Na+ ions = 0.040 M
For Na3PO4, Molarity of Na+ ion = 0.060 M
Molarity of a substance:
The molarity of a substance is the molar amount of that substance present in a given volume of solution of that substance.
Molarity = moles of substance / volume of substance
The molarity of Na+ ions in a 0.0200 M aqueous solution of a particular sodium salt is calculated as:
Molarity = moles of sodium ion in 1 mole of salt * Molarity of salt.
For NaBr:
moles of Na+ ions in 1 mole of salt = 1 mole
moles of Na+ ions = 1 * 0.020 M
moles of Na+ ions = 0.020 M
For (Na2SO4);
Na+ ion molarity = 2 * 0.020 M
Na+ ion molarity = 0.040 M
For Na₃PO₄ :
Moles Na+ ion in 1 mole salt = 3 moles
Na+ ion molarity of = 3 * 0.020 M
Molarity of Na+ ion = 0.060 M
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a compound is found to contain 7.523 % phosphorus and 92.48 % iodine by mass. what is the empirical formula for this compound?
PI₃ is a compound is found to contain 7.523 % phosphorus and 92.48 % iodine by mass. PI₃ is the empirical formula for this compound.
It is shown that the empirical formula can be calculated using the phosphorus to iodine molar ratio.
The substance contains 7.523% of its weight in phosphorus, or 7.523 grammes of phosphorus for every gramme of the substance.
1 g of the substance multiplied by (mol/30.97g P) x (7.523g P) equals (0.2429 mol P) / (1 g substance)
In a manner similar to this, the following is determined for the iodine content per gramme of substance:
(0.7288 mol I / 1 g substance) x (mol/126.90 g I) x (92.48 g I) (1 g substance)
The molar ratio of P to I is calculated by dividing the two estimated values:
(0.3 mol I)/(0.7288 mol I) = (0.2429 mol P)/(1 g substance) (mol P)
Since the ratio of iodine to phosphorus is 3:1, the empirical formula, or the most fundamental formula, is PI3.
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chemical analysis shows that the oxygen-carrying protein hemoglobin is 0.34 percent fe by mass. the actual molar mass of haemoglobin is about 65000g. how many fe atoms are in one molecule of haemoglobin.
Chemical analysis shows that the oxygen-carrying protein hemoglobin is 0.34 percent Fe by mass. the actual molar mass of hemoglobin is about 65000g. There are Fe atoms in one molecule of hemoglobin
Hemoglobin efficiently transports oxygen from the lungs to the body's tissues. Additionally, it helps in the return of carbon dioxide and hydrogen ions to the lungs. For the creation of blood, iron is crucial. Red blood cells and muscle cells contain about 70% of the iron in our bodies. Given the information, we may conclude that:
Mass of Fe in hemoglobin = 0.34% of molar mass of hemoglobin
Mass of Fe in hemoglobin = 0.34% of 65000
= (0.34 x 65000) / 100
= 221 g/mol
We now understand that the molecular weight of iron (Fe) is 55.85 g/mol.
Therefore, the quantity of iron in hemoglobin divided by the molecular mass of iron gives the amount of iron in 1 mole of hemoglobin.
= 221/55.85
= 3.957, which is approximately equal to ‘4’
In line with this, 1 molecule of hemoglobin has 4 Fe atoms in it.
The right response is hence "4".
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what is the number of moles of hydrogen atom in 6.4g of methane CH4
The number of moles of hydrogen atom in 6.4g of methane CH4 is 0.4 moles.
To find the number of moles of hydrogen atoms in 6.4 g of methane (CH4), we need to know the molar mass of methane and use the formula for converting mass to moles:
moles = mass / molar mass
The molar mass of methane is 16.04 g/mol, so we can plug in the values and solve:
moles = (6.4 g) / (16.04 g/mol)
moles = 0.4 moles
There are 0.4 moles of hydrogen atoms in 6.4 g of methane. This is because methane is a compound made up of one carbon atom and four hydrogen atoms, and the number of moles of a compound is equal to the total number of moles of all the atoms in the compound.
Since there are four hydrogen atoms in each mole of methane, there are also 0.4 moles of hydrogen atoms in 0.4 moles of methane.
ella is interested in combining substances to form a new material. what does she need to know before she combines the substances to create a specific material? a. whether the substances are synthetic or from natural resources b. that all materials react to combine and form new products accidentally c. the physical and chemical properties of the material that will be formed d. the physical and chemical properties of the substances and how they react chemically
Ella is intrigued by the idea of fusing elements to create new materials. Before she mixes the ingredients to make a particular materials, she must understand the physical and chemical qualities of the constituent parts and how they interact.
Sanding just altered the surface's texture; the wood itself did not convert into a new substance. Even though a piece of metal may glow after being burnt in a fire, the metal remains the same substance both during and after cooling. The production, characterization, and use of materials with intriguing or potentially beneficial physical or chemical properties include the use of chemistry, according to the emerging and highly multidisciplinary field of study known as materials chemistry.Materials chemistry includes solid-state chemistry, nanoscience, and polymer chemistry since it encompasses inorganic, organic, polymeric, and hybrid materials. The creation of new technologies and the growth of the world economy both depend on materials chemistry. Looking back, we can see that synthetic materials have significantly raised global living standards and quality of life.
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a chemist decomposes 1.006 g of nahco3 and obtains 0.0334 g of na2co3. what are the units on the theoretical yield, the actual yield and percent yield?
The theoretical yield is 0.634 g, the actual yield is 0.0334 g and percent yield is 5.268 %.
2 NaHCO₃(s) → Na₂CO₃(s) + H₂O(l) + CO₂(g)
NaHCO₃ = 1.006 g = (1.006 / 84) moles
Na₂CO₃ = 0.0334 g
Now, 2 moles NaHCO₃ gives 1 mole of Na₂CO₃
∴ (1.006 / 84 ) NaHCO₃ gives ( ? ) mole of Na₂CO₃
= ( 1 × 1.006 × 106 / 2 × 84 ) g
= 0.634 g
Theoretical yield = 0.634 g
Actual yield = 0.0334 g
Now, % yield = ( Actual yield / Theoretical yield ) × 100
= ( 0.0334 / 0.634 ) × 100
= 5.268 %
So, The theoretical yield is 0.634 g, the actual yield is 0.0334 g and percent yield is 5.268 %.
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how many milliliters of 2.50 m hcl (aq) are required to react with 8.05 g of an ore containing 44.0% zn (s) by mass? the molecular weight of zn is 65.38 g/mol.
43.312 mL of 2.50M HCl is required to react with zinc single displacement reaction occurs.
Hydrogen gas and zinc chloride are produced quickly by the reaction of zinc with hydrochloric acid. In a single displacement reaction, zinc metal displaces hydrogen to produce zinc chloride and hydrogen gas. Because the reaction is exothermic, a significant amount of heat is produced.
The reaction goes in following order
[tex]Zn(s)+2HCl(aq)\rightarrow ZnCl_{2}(aq)+H_{2} (g)[/tex]
Percentage of Zn = (mass of Zn/mass of Ore) x 100
Mass of Zn = [tex]\frac{44 \times 8.05}{100}[/tex] = 3.54g
n Zn= [tex]\frac{3.54g}{65.38g}[/tex] per mole = 0.054144
n [tex]HCl[/tex] = 2 x 0.054144 = 0.10828
M= [tex]\frac{n}{V}\times1000[/tex]
V=[tex]\frac{n}{M}\times1000[/tex]
[tex]\frac{0.10828}{2.50}\times1000[/tex] = 43.312 mL
So 43.312 mL of 2.50M HCl is required to react with zinc.
The reaction goes in following order
[tex]Zn(s)+2HCl(aq)\rightarrow ZnCl_{2}(aq)+H_{2} (g)[/tex]
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Which atom in the pair is smaller?
1. Cl or I.
2. In or Sn.
3. Li or Be.
4. P or Al.
5. Ga or In
Cl atom is smaller compared to I. Similarly, Sn is smaller than In . The smaller atom among Li and Be is Be and that among P and Al is P. The smaller atom among Ga and In is Ga.
What is atomic size?Atomic size of an atom is determined with respect to the distance from the nucleus to the valence shell. Along a period from left to right side the atomic size decreases.
Similarly down a group atomic size increases. Down a group a new valence shell is added to the atom and that increases the size of an atom. iodine is the heavy atom among halogens and thus, Cl is smaller than I.
In is in 13th group and Sn is 14th group. So from left to right size decreases. Thus, Sn is smaller. Similarly Be is smaller and P is smaller than Al.
Ga is early element in the and in is next to Ga. Thus, down the group, atomic size decreases. Thus, Ga is smaller.
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a housewife used the aluminum can to keep vinegar. After sometime, it is found that the vinegar is spoiled. Give a reason.
Answer:
Explanation:She was wrong
a 150- mgmg sample of technetium-99 mm is used for a diagnostic test. if technetium-99 mm has a half-life of 6.0 hh , how many milligrams of the technetium-99 mm sample remains active 18 hh after the test? express your answer to two significant figures and include the appropriate units.
a 150- mgmg sample of technetium-99 mm is used for a diagnostic test. if technetium-99 mm has a half-life of 6.0 hh , 19 milligrams of the technetium-99 mm sample remains active 18 hh after the test.
Decay of radioactive substances follows first-order kinetics. First order rate equation is A = Ao e-kt. Ao = Intial active amount of substances .
A = Active amount of substance after certain time (t), K = Decay constant. k = ln2 / t½, k = 0.693 / 6.0 hr, k = 0.1155 / hr. A = Ao e-kt A = 150 mg x e-0.1155 hr?¹ x 18.0 hr. A = 18.758 mg.So Answer = 19 g of remains active 18 h after the test.The half-life of a quantity is the time it requires to decrease to half of its original value. In nuclear physics, the term is usually used to describe how rapidly atoms undergo radioactivity or how long stable atoms live. The term is also used to describe any kind of exponentially decaying in general.
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How many elements belong to the Halogen family? List the member elements by their symbol?
Answer:
5
Explanation:
fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).
On a hot sunny day, why do people sprinkle water on the roof or open
ground?
The latent heat of vaporization causes water sprinkled on the ground or roof to evaporate, producing a cooling effect.
What is vaporization?Vaporization is defined as the process of changing a substance's liquid or solid state into its gaseous (vapor) state. Boiling and evaporation are the two processes that cause vaporization. When water is exposed to sunlight, evaporation takes place when the water turns into vapour and rises into the atmosphere. Boiling is the process of vaporizing a liquid when the environment permits the development of vapor bubbles inside the liquid.
After a while, this evaporation in the case of the ground cools the space around it, whereas in the case of the roof, the room below is chilled. The significant latent heat of vaporization of water contributes to cooling the hot surface, which is why evaporation of water has a cooling effect. The water quickly evaporates from the hot road surface, removing heat from it in the process.
Thus, the latent heat of vaporization causes water sprinkled on the ground or roof to evaporate, producing a cooling effect.
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calculate the mass percent of a nacl solution prepared by mixing 35.0 g nacl with 125.0 ml of pure water.
Mass percent of Sodium Chloride solution prepared by mixing is 21.875%.
A mixture is a chemical substance comprised of two or more unrelated chemical components. A mixture is a physical combination of two or more distinct substances that can take the form of solutions, suspensions, or colloids. Solutions of salt and water are an example of a homogeneous mixture, whereas sand and water and oil and water are instances of heterogeneous mixtures.
Density of Water = 1g/mL
So, 125 mL of water weighs 125g
Mass of [tex]NaCl[/tex] = 35.0g
Total mass of solution = 125g+35g = 160g
Mass % of [tex]NaCl[/tex] =(Mass of [tex]NaCl[/tex] / Total Mass ) × 100
= (35/160) × 100
= 21.875%
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Look at strontium (Sr) in the periodic table. Would you expect it to be more or less reactive than calcium? Explain.
answer: strontium is more reactive
steps:
strontium is heavier &
strontium is bigger, so
strontium would lose its 2 outer electrons more easily than calcium
strontium is more reactive
reactive means how easily an atom loses or gains electrons
in the periodic table :
rows are called periods
columns are called groups
strontium & calcium are both in the same column
strontium & calcium are both in group 2
strontium is chemically similar to calcium
group 2 elements can lose two electrons
group 2 metals tend to have a +2 charge
group 2 is called alkaline earth metals
factoid : radioactive strontium has been found in many bones from nuclear testing in the 1950s
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Which scientist help developed the current model of the atom which states that electrons are located in regions known as orbitals or electron clouds?
a. Neils Bohr
b. Erwin Schrodinger
c. Earnest Rutherford
d. Max Planck
e. James Cahdwick
Answer: the answer is Erwin Schrodinger.
Explanation:
Khloe is preheating her oven before using it to bake. Khloe wants to predict the final temperature after xx minutes. She wrote the equation y=20x+78y=20x+78, where yy represents the final temperature in degrees fahrenheit. What is the meaning of the yy-value when x=1x=1?.
The final temperature of the oven after being preheated, y is 98 degrees Fahrenheit.
What is the relationship between the final temperature and the time taken to preheat the oven?The relationship between the final temperature, y, and the time taken to preheat the oven, x is given by the equation below:
y = 20x + 78
where;
the final temperature is y,
and the time taken to preheat the oven is x
When x is equal to 1, the value of y can be determined as follows:
y = 20 (1) + 78
y = 98 degrees Fahrenheit.
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Scientists improved Mendeleev’s early periodic table by ___.
including physical properties of elements such as melting point and density
including chemical properties of elements such as the ability to burn or to tarnish
using atomic number instead of atomic mass to organize the elements
using numbers of neutrons and protons to organize the elements by their properties
Scientists improved Mendeleev’s early periodic table by using atomic number instead of atomic mass to organize the elements. Option C
What is the periodic table?We know that the periodic table is the arrangement of the elements by the use of a definite sequence. The order of the arrangement of the elements would be determined in a given manner.
In the Mendeleev’s periodic table, the arrangement of the elements was on the basis of the masses of the elements. This method did not produce a consistent pattern for all the elements.
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Answer:using atomic number instead of atomic mass to organize the elements
how many times acidic is pOH 12 than pOH 10
Answer:
100x less acidic
Explanation:
pOH is the inverse of pH, which is a measure of the acidity or basicity of a solution. The lower the pH of a solution, the more acidic it is, and the higher the pOH, the less acidic it is.
To determine how many times more acidic a solution with a pOH of 12 is compared to a solution with a pOH of 10, we can use the formula:
pH1 / pH2 = 10^(pOH1 - pOH2)
In this case, we are given that the pOH of the first solution is 12 and the pOH of the second solution is 10. We can plug these values into the formula to calculate the ratio of acidity:
pH1 / pH2 = 10^(12 - 10)
= 10^2
= 100
Therefore, a solution with a pOH of 12 is 100 times less acidic than a solution with a pOH of 10.
each of the structures for clocl , ncoh , and clno has atoms connected in the order given in their formulas. identify the type of hybridization for the central atom in each compound.
The type of hybridization for the central atom in each compound is as follows ; Initially we can determine the precise hybridization of each of the mentioned atoms by examining the structures of each molecule.
When we look at ClNO, we can see that the nitrogen atom is linked to chlorine by a single bond while also maintaining a lone pair on oxygen by double bonds. The nitrogen is therefore in a sp2 hybridized form.
As is expected for ClOCl, the molecule has two lone pairs on the oxygen atom and an sp3 hybridized oxygen atom connected to two chlorine atoms.
The carbon atom in NCOH is sp2 hybridized because it is doubly linked to oxygen.
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g if a certain radioactive substance has a half-life of 7 days, how long, in days, does it take for the sample to decay to 1 3 of its original amount
Radioactive decay is the spontaneous decomposition of the unstable nucleus of an atom.The emission of a particle or a photon.
For example, alpha decay is radioactive decay in which an atomic nucleus emits an alpha particle (helium nucleus).
general formula used for decay
Nt=No(1/2)^T/t1/2T = duration of decay
t 1/2 = half-life
N₀ = the number of initial radioactive atoms
Nt = the number of radioactive atoms left after decaying during T time
t1/2=7 days
Nt/No=1/3
1/3=1/2^T/t1/2
6=T/14.3
T=85.8 days
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aluminum metal reacts with chlorine gas to form aluminum chloride the reaction starts with 3 g of chlorine gas and unlimited supply of aluminum, how many grams of aluminum chloride can be formed?
The aluminum metal reacts with chlorine gas to form aluminum chloride the reaction starts with 3 g of chlorine gas , grams of aluminum chloride formed is 3.73.
The balanced reaction is given as :
2Al + 3Cl₂ ----> 2AlCl₃
mass of Cl = 3 g
molar mass of Cl₂ = 71 g/mol
moles of Cl₂ = mass / molar mass
= 3 / 71
= 0.0422 mol
3 mole of Cl₂ produces 2 moles of AlCl₃
0.0422 mol of Cl₂ = (2/3) 0.0422
= 0.028 mol of AlCl₃
mass of AlCl₃ = molar mass × moles
= 133.34 × 0.028
= 3.73 g
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which metal would you expect to have the highest melting point? which metal would you expect to have the highest melting point? agag tctc rbrb
Among the elements in the periodic table, tungsten metal is expected to have the highest melting point.
Tungsten, having atomic number 74 belongs to the 6th group and 6th period of the periodic table.
It is the metal with the highest melting point i.e 3422°C . For this reason, tungsten is used as a metallic component in the filaments of electric bulbs and in cathode ray tubes.
Tungsten is considered a refractory metal due to its heat-hesistance nature. on the other hand, alkali metals such as Li,Na,K have low melting points because of their large size of atoms and due to which the binding energies of the atoms in the crystal lattice is comparatively low, resulting in low melting point.
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Which element has a larger atomic radius F or Be
Answer:
F
Explanation:
A "calorie" is a unit of energy, defined as the amount of energy needed to raise the temperature of one gram of water by one degree Celsius. The nutritional labels on food products typically tell you how many calories of digestible energy are in one serving of food, where "digestible" means that the energy stored in the chemical bonds of the molecules comprising the food can be extracted by your body. (Water for example has energy, but that energy is not chemically accessible via digestion.) To simplify understanding for typical consumers, the "calories" reported on nutritional labels actually represent kilocalories: a 170 calorie can of beer actually contains 170,000 calories of digestible energy i)
i. If a student foolishly decides to binge drink 21 beers on their 21t birthday, how many gallons of water could they have heated from room temperature (24 °C) to boiling (100 C) using an equivalent amount of digestible energy in the beer? Recall that one gallon of water is roughly 8 pounds ii)
ii. What is this energy equivalent to in BTU? A "BTU" or British Thermal Unit is also a unit of energy, defined as the amount of energy needed to raise the temperature of one pound of water by one degree Fahrenheit iii)
iii. If you had purchased an equivalent amount of electrical energy in kW-hr from the utility company, how much would you have to pay? Is this cheaper than buying beer? A kW-hr ypically costs 10 cents
The amount of energy required to increase the temperature of one gram of water by one degree Celsius is known as a "calorie," which is a unit of energy.
For example, a 170 calorie can of beer actually contains 170,000 calories of digestible energy,
so if a student foolishly decides to binge drink 21 beers, the equivalent amount of digestible energy in the beer is 21x17000.
= 3570kcal
Nutrition labels on food products typically tell you how many calories of digestible energy are in one serving, where "digestible" means that the energy stored in the chemical bonds of the molecules comprising the food can be extracted by your body.
Another heat measurement unit used in the US is the British thermal unit, or Btu. The amount of heat needed to increase 1 lb of water's temperature by 1°F is equal to 1 Btu.
As a result, the energy in BTUs E(BTU) is equivalent to 0.00029307107017 times the energy in kilowatt-hours E(kWh):
E(kWh) = 0.00029307107017 × E(BTU)
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how are minerals classified? question 3 options: a) based on their chemical structure b) based on solubility c) based on amount needed per day d) based on food source
Based on their solubility, minerals are divided into categories.
Depending on the quantity required by the body, minerals are either categorised as significant minerals or trace minerals. Based on their solubility, minerals are divided into categories. Major minerals are all those that must be consumed in dietary quantities more than 100 mg daily. These include calcium, phosphorus, magnesium, sodium, potassium, chloride, and sulfur. While vitamins are composed of the thirteen organic micronutrients that the body need for regular functioning, minerals are inorganic substances that are crucial to human nutrition. A mineral is an inorganic element and compound that occurs in nature and has a recognizable chemical composition, crystal structure, and physical characteristics. Quartz, granite, mica, actinolite, olivine, and calcite are examples of common minerals. Heiskanen defined classification as a process for dividing mineral combinations into two or more categories.
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what is the iupac name of the following compound? multiple choice 4-hydroxy-3-methylbutanoic acid 3-hydroxy-2-methylbutanoic acid 1-hydroxy-2-methylbutanoic acid 3-(hydroxymethyl)butanoic acid
The IUPAC name of the given compound is option A) 4-hydroxy-3-methylbutanoic acid
The International Union of Pure and Applied Chemistry (IUPAC) nomenclature of organic chemistry is a system for naming organic chemical compounds in chemical nomenclature (IUPAC). It appears in the Blue Book, also known as the Nomenclature of Organic Chemistry. Every potential organic molecule should ideally have a name that can be used to generate a clear structural formula. Inorganic chemistry has its own IUPAC terminology as well.
Except when it is required to provide a compound an unambiguous and absolute definition, the official IUPAC naming rules are not usually followed in practice because it is preferable to avoid verbose and tiresome names in everyday communication. Sometimes, IUPAC names are shorter than earlier terms, for as when ethanol is used in place of ethyl alcohol.
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how are components separated using distillation? the substance with the [ select ] vapor pressure is vaporized first, and then it is
The material with the lower boiling point vaporizes first when heated, then condenses and collects.
The heat that is generated during the condensation process of higher boiling vapor is what leads to the process of vaporization. Because it has such a huge surface area, the packing enables vapors to move freely between the ascending and descending directions. In the process of evaporation, the vaporization happens at a temperature lower than the boiling point, whereas in the distillation process, the vaporization happens at the boiling point.
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identify the following amino acids and their 3-letter and 1-letter abbreviations.
Symbol Shorthand named amino acid. Alanine is A. Ala. Arginine, R. Arg. Asparagine, N. Asn. Aspartic acid, D. Asp. Cysteine, or C. Cys.
An abbreviation with three letters is known as a three-letter acronym (TLA) or three-letter abbreviation. Symbol Shorthand named amino acid. Alanine is A. Ala. Arginine, R. Arg. Asparagine, N. Asn. Aspartic acid, D. Asp. Cysteine, or C. Cys. When a phrase is abbreviated, the first letters of the phrases are often capitalized (written in upper case); examples include etc. and Mrs. Gamma A neurotransmitter, or chemical messenger, in your brain is called -aminobutyric acid (GABA). GABA is well known for its relaxing effects. However, some hints are beneficial. Two of them—F for phenylalanine and R for arginine—are phonetically suggestive. The tryptophan molecule's double ring corresponds to the hefty letter W.
(Identify the following amino acids and their 3-letter and 1-letter abbreviations.(Use capital letters where they are appropriate))
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