Covalent bonds predicted from an atom of Silicon (Si) are Four covalent bonds.
Covalent bonds are generally formed by the non-metals. These bonds are formed when electrons are shared between the atoms. To know the number of covalent bonds in any atom, you must know the number of valence electrons.
Those elements which belong to the period 2 forms covalent bond as-
8 - number of valence electrons.
Those elements which are from period 3, they form covalent bonds exactly same as the number of valence electrons.This is because d-orbitals are present in the period.
Silicon is the 14th element which belong to period 3. The electronic configuration of 1s² 2s² 2p⁶ 3s² 3p²
Just like Carbon (C), Silicon (Si) is tetravalent in nature, which means that it can easily share all four of its valence electrons and form covalent bonds. To become stable, Silicon(Si) will form four covalent bonds.
Silicon has four valence electrons, so it will form four covalent bonds.
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Copper can have improved wear resistance if alloyed with ceramic alumina, Al2O3. If a copper alloy has 9.3 wt % Al2O3, what is its composition in mol %?
Composition in mole % is 0.091%
Given:
Copper alloy has 9.3 wt % Al2O3 = 9.3 wt/wt%
So the mol % of Al2O3 can be find by
Mole% = w/w% / Mwt
Mwt og Al2o3 = 101.968
Mole% = w/w% / Mwt
= 9.3 / 101.96
Mole% = 0.091%
The term "mole percent" (mol%) refers to the mole fraction in a different format. By multiplying the mole fraction by 100, the mole percent of the specified component can be calculated. Mole fraction multiplied by 100 equals Mole percent.
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You are doing a lab and the instructions tell you to use 100x magnification. you know the eyepiece has 10x the magnification. what objective lens would you use to reach 100x magnification?
The objective lens that would you use to reach 100x magnification is known as the Oil immersion objective lens.
What is Magnification?Magnification may be defined as the process of making enlarged views of smaller objects like cell specimens with the help of tools and devices.
The Oil immersion objective lens is known to have the most powerful magnification with a whooping magnification range of approximately 1000x when significantly combined with a 10x eyepiece.
Therefore, the Oil immersion objective lens is the objective lens that would you use to reach 100x magnification.
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Substituting the residue at position 54 of bvga with which amino acid will least likely prevent the expression of the ptx operon?
a. glycine
b. asparagine
c. glutamate
d. alanine
Glutamate is an amino acid that is put together in the body and also take place commonly in many foods.
Glutamate acts as a neurotransmitter.
Neurotransmitter act as a messenger.
A chemical messenger.
According to question,
C- one and only that is negative charge
As glutamate and aspartate both shore up a negative charge at corporal pH,a interchange of glutamate for an aspartate is the most reactionary and unlikely to act on the BvgA upholder binding and the C- only one that is negative charged of the pTx operon
Glycine, Asparagine and Alanine have no charged.
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Consider two acids: hco2h (formic acid, pka = 3.8) and cl2chco2h (dichloroacetic acid, pka = 1.3). which acid is the stronger acid? select the single best answer.
Between formic acid, HCO2H, and dichloroacetic acid, Cl2CHCO2H, dichloroacetic acid, Cl2CHCO2H is the stronger acid based on their pka.
Acids and bases can be classified into two: weak and strong.
A strong acid or a strong base completely dissociates in a solution while weak acid or a weak base dissociates only partially.
Based on its dissociation constant, Ka, the larger the value of the Ka of an acid, the stronger it is.
On the other hand, the smaller the value of the logarithmic constant, pKa = - log Ka, the stronger the acid is.
Between formic acid, HCO2H, and dichloroacetic acid, Cl2CHCO2H, which has a pKa of 3.8 and 1.3, respectively, dichloroacetic acid, Cl2CHCO2H has smaller value of pKa.
Hence, dichloroacetic acid, Cl2CHCO2H is the stronger acid.
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If the reaction occurs with an 82. 4% yield, what mass of aluminum should be reacted with excess oxygen to produce 45. 0 grams of al2o3?.
If the reaction occurs with an 82. 4% yield mass of aluminum should be reacted with excess oxygen to produce 45. 0 grams of al2o3 is
4 Al(s) + 3 O2(g) → 2 Al2O3(s)
Molar mass of Al = 26.98 g/mol
Molar mass of O2 = 31.99 g/mol
Molar mass of Al2O3 = 101.96 g/mol
From the above-balanced reaction:
4 x 26.98 = 107.92 g of Al produces 2 x 101.96 = 203.92 g of Al2O3
Hence, the amount of 203.92 g of Al2O3 is 100% yield.
But given condition is only for 82.4% yield, so the mass of Al2O3 associated with an 82.4% yield
= 82.4 x 203.92 / 100
= 168.03 g of Al2O3
Now, as 168.03 g of Al2O3 requires 107.92 g of Al
So, Al required to produce 45.0 g of Al2O3 = 45.0 x 107.92 / 168.03
= 28.9 g of Al
Mass is the amount of matter in the physical body. It is also a measure of body inertia, resistance to acceleration when a net force is applied. An object's mass also determines the strength of gravity on other objects. The SI base unit of mass is the kilogram.
mass. A quantitative measure of inertia in physics, a fundamental property of all matter. In effect, it is the resistance that an object offers to changes in velocity or position when a force is applied. The greater the mass of an object, the smaller the change caused by an applied force. In mathematics, mass refers to the amount of matter in an object. Mass is commonly measured by the weight of an object. The more stuff you have, the heavier it will be. For example, mice have more matter than ants, so mice have more mass.
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If the reaction occurs with an 82. 4% yield, what mass of aluminum should be reacted with excess oxygen to produce 45. 0 grams of al2o3?
Which type of bond exemplifies a weak chemical bond? covalent bonds in solution hydrogen bonds in solution ionic bonds in solids nonpolar covalent bonds in solids
Covalent bonds in solution, hydrogen bonds in solution, ionic bonds in solids, nonpolar covalent bonds in solids- the weakest bond is hydrogen bond.
What is a chemical bond?
A chemical bond is a strong bond that can be formed between atoms, ions, or molecules to create chemical compounds. In covalent bonds, the electrons are shared, whereas in ionic bonds, the electrostatic attraction of two ions with opposing charges forms the link. Strong bonds, also known as primary bonds, include covalent, ionic, and metallic ties. Weak bonds, also known as secondary bonds, include dipole-dipole interactions, the London dispersion force, and hydrogen bonds.
Since there is no necessity for an electron exchange during formation, the hydrogen bond is weak. As a result, it is simpler to break apart a hydrogen connection between two molecules.
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Engineers in russia invented a new way to create colorful art with a ____laser______.
Engineers in Russia invented a new way to create colorful art with constructive laser art.
What is constructive laser art?Modern industrial life and urban space were intended to be reflected in constructivist art. It produces art using industrial manufacturing techniques and inexpensive materials.
The idea behind constructivism was to replace conventional art by emphasizing engineering rather than painting. Russia started a colorful way to create new art.
Thus, Russian engineers developed a fresh method for producing vivid artwork using constructive laser art.
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What compound interest per period in percentage would result in the future amount being 1.6 times as large as the starting amount at the end of 10 periods?
The nominal interest rate is therefore 4.8122%.
This compound interest problem can be solved by using the formula
A = P(1+i^)n,
where i = r/n and
A represents the total amount of money accumulated during the nth conversion period.
The nominal interest rate is r.
P is the initial investment's primary amount.
t is the number of years,
n is the number of compounding periods per year.
Assuming P = $100 in this case,
the eventual amount A will be 1.6 * 100 = 160, t = 10 years, and n = 1.
The result of the formula above is Nominal interest rate (in decimal) is equal to n [(A/P)^1/nt - 1].
When we substitute,
we obtain the value r = 1*[(160/100)^1/10 -1].
r = (1.04812 -1)
r =0.048122 (in decimal)
r = 0.048122 *100
r= 4.8122%
The nominal interest rate is therefore 4.8122%.
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The atomic orbital of the quantum mechanical model is very similar to the orbit described by the bohr model. True or false
The given statement is false.
In physics, a quantum (plural quanta) is the minimum amount of any bodily entity (physical property) concerned in an interaction. The vital thinking that a bodily property can be "quantized" is referred to as "the speculation of quantization".[1] This capability that the magnitude of the bodily property can take on only discrete values consisting of integer multiples of one quantum.
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If you have 9 moles of cacl2 and all the na3po4 i needed, how many moles of nacl could you produce?
If you have 9 moles of CaCl₂ and all the Na₃PO₄i needed 18 moles of NaCl
In the chemical reaction here
CaCl₂ + Na₃PO₄ → Ca₃(PO₄)₂ + NaCl if we balance this chemical reaction then
3CaCl₂ + 2Na₃PO₄ → Ca₃(PO₄)₂ + 6NaCl then Ca=1×3=3
,Cl=2×3=6,
Na=3,PO₄=1,
all this are in reactant Ca=3, Cl=1, Na=1, PO₄=2 all this are in product so NaCl produce 18 moles.
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How many covalent bonds are predicted for an atom of cl? enter your answer in the provided box.
Seven covalent bonds are predicted for an atom of cl.
covalent bonds are formed by the mutual sharing of electrons from the atoms taking part in the bonding. Atoms participating in a covalent bond share their valence electrons in a way to complete their octet rule.
A covalent bond depends on the number of electrons that are present in the valence shell. The formation of CH4, H2O, and NH3, are types of covalent bonding.
A chlorine atom has seven electrons in its valance shell so it can form seven covalent bonds.
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Propane, c3h8, is a common fuel used for cooking and home heating. what mass of o2 is consumed in the combustion of 1.00 g of propane?
3.63g of O2 is consumed in the combustion of 1.00 g of propane.
Propane, c3h8, is a common fuel used for cooking and home heating.
C3H8 + 502---> 3CO2 + 4H20.
The combustion equation must first be balanced as illustrated above. The law of constant proportions can then be used to deduce that for every 1 mol of C3H8, there will be 5 mol of O2.
Using significant figures,
1 mol C3H8 -------> 44 g
1 mol O2 ------> 32g x 5 = 160
= 160/ 44g
160g/44g= 40/11 = 3.63g.
= 3.63g of O2 is consumed in the combustion of 1.00 g of propane.
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Consider the reaction of 1,3,3-trimethylcyclohexene in the presence of nbs (w/trace hbr). how many products (including stereoisomers) can form?
The reaction of 1,3,3-trimethylcyclohexene in the presence of nbs (w/trace hbr) 3 products are formed.
1,3,3-trimethylcyclohexene in the presence of nbs (w/trace hbr) 3 products are formed 1,3,3-trimethylcyclohexene molecular formula is C9H16 in this structure 3 methyl group are present 2methyl are present in 1 carbon of benzene ring means 1 para position and 1 methyl group is present on meta position so in 1st step nbs means n bromosuccinimide attack on methyl group and br are are join means on para group 2 methyl are attach in that 2 methyl 1 methyl is attach to the br group now in 2nd step br are attach on allylic carbon in 3rd step br are attach on next para position so here 3 products are formed.
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A marble rolls down a ramp that is 16 meters long. It takes the marble .5 seconds to reach the bottom of
the ramp. What is its average speed?
Answer:
average speed = 32
Explanation:
the formula is speed = distance / time
so s = d / t
s = 16 m / 0.5 s
s = 32 meter per second
A cube of iron, which has a density of 7.87 g/cm3, has an edge length of 3.75 cm. what is the mass of the sample?
A cube of iron, having a density of 7.87 g/cm3, has an edge length of 3.75 cm, the mass of the sample will be - 19.675 kg.
What is the mass of cube?The volume of a cube is really calculated by multiplying the length by the width and then by the height. The formula yields the measurement of one side cubed since all three measures are the same. In this case, 5 x 3 is equal to 125 cm 3. The volume is multiplied by the known density, or the mass per volume.
Iron Density = 7.87 g/cm3
Volume of Iron = 2500 cm3
Mass=(V)(D)
Mass= (2500 cm3)(7.87 g/cm3)
Mass=19,675g
= 19.675 kg
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This country has the most tornadoes in the world every year.
Canada
O United States
O Mexico
O England
Answer:
it's the United states
Explanation:
because It has alot of tornadoes
Which substance is likely to contain the highest percentage of double bonds in the hydrocarbon chains of its triglycerides?
Olive oil substance is likely to contain the highest percentage of double bonds in the hydrocarbon chains of its triglycerides.
In organic chemistry, hydrocarbons are organic compounds composed entirely of hydrogen and carbon. [1]:620 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. They come in a variety of molecular structures and phases.
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. Hydrocarbons are the primary energy storage molecules of all major fossil fuels (including coal, oil, and natural gas) and biofuels. It is also a raw material in the manufacturing process of many types of plastics.
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Anunknown carbon sample (z = 6) was found to contain two isotopes 12c and 14c, and measured to have an atomic mass of 12.8 amu, what is the fraction of 12c in the sample?
The fraction of 12c in the sample is 60% or 0.6
What are Isoptes?Isotopes are two or more different atom types that share the same atomic number and are placed in the periodic table but have different quantities of neutrons in their nuclei, resulting in various nucleon numbers. Or, any of two or more types of atoms of a chemical element that have the same atomic number and essentially the same chemical behavior, but have distinct atomic masses or mass numbers and different physical properties. Isotopes are atoms that are part of the same element and have the same atomic number Z but a different mass number A. For instance, three isotopes of the element carbon, with respective masses of 12, 13, and 14, are carbon-12, carbon-13, and carbon-14.
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Calculate the moles of ammonia present in a 3.939 g sample of ammonia, which has a molar mass of 17.030 g/mol.
The moles of ammonia present in a 3.939 g sample having molar mass of 17.030 g/mol is 0.23 mole.
The mass of one mole of a substance, whether be an element or a compound is known as the molar mass.
If the molar mass of ammonia is 17.030 g/mol, then
In 1 mole of ammonia there are 17.030 g.
So, by definition of molar mass, there are-
17.030 g in 1 mole of ammonia,
In 3.939 g of ammonia, number of moles are -
number of moles = Given mass
Molar mass
moles = 3.939 g = 0.23 mol
17.030 g/mol
The moles of ammonia present in a 3.939 g sample are 0.23 mol.
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Cobalt-60 is produced by neutron activation. in this process, one neutron is absorbed by the nucleus of the parent isotope. what is the parent isotope? give both the mass number and atomic number.
The parent isotope is cobalt-59 (see the picture below).
The mass number is 59 and atomic number is 27 of the parent isotope.
Neutron activation is the process in which atomic nucleus capture free neutron or neutrons.
Cobalt-60 is produced in nuclear reactors in process of neutron activation from parent isotope cobalt-59 (see the picture below).
Atomic number (Z) is total number of protons and mass number (A) is total number of protons and neutrons in a nucleus.
Cobalt-59 and cobalt-60 are the isotopes of chemical element cobalt.
Isotopes are chemical elements with same atomic number (Z), but different mass number (different number of neutrons).
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Write a short evaluation of the article’s reliability and scientific worth. Support your evaluation with specific examples from the article.
It is important to make sure the information is accurate whether writing a research paper, practising a speech, or working on any other project that depends on data from outside sources.
Investigate the method of determining a source's dependability, credibility, and reliability.Let us write a short evaluation on OZONE HOLE.
A large portion of the Sun's bright radiation is absorbed by the ozone layer, a shield region of the stratosphere. It has a large concentration of ozone.
It contains oxygen atoms that shield the surroundings from harmful radiation, such as brilliant beams, that are emitted by the sun and are available in space.
The ozone opening is less of a gap in the windshield and more of a dip. There is neither a uniform thinning of the ozone layer nor does the ozone disappear through it. The French physicists Charles Fabry and Henri Buisson also discovered it in 1913.
A size of 7.6 million square miles (19.7 square kilometres) was reached by the ozone opening in 2017 before it started to close. The distance increased to 8 million square miles in 2016.
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ASAPP!!! CHEM HW HERE
3. Rutherford's gold foil experiment showed several new things abOut the structure of the atom. Which results support the claim that the atomn has a dense, positively charged core? Choose the two statements that apply. A. Some positive particles deflected at sharp angles. B. Some negative particles defiected at sharp angles. C. Most of the positive particles passed straight through the foil. D. Some positive particles bounced back in the direction they came from.
Answer:
D. Some positive particles bounced back in the direction they came from
A sample of ammonia contains 9.0 g of hydrogen and 42 g of nitrogen. another sample of the same compound contains 15.0 g of hydrogen. calculate the amount of nitrogen in the second sample of ammonia.
Mass of nitrogen in the second sample = 70 g.
Simply said, (14.01 + 14.01) = 28.02 amu is the mass of the nitrogen molecule, or N2. This is referred to as the molecular mass, which is just the total atomic masses of all the atoms that make up a certain molecule.
What is nitrogen?Nitrogen is a chemical element with the atomic number 7 and the letter N. Nitrogen is a nonmetal and the lightest element in Periodic Group 15 (also known as the pnictogens). It is a common element in the universe, ranked eighth in the Milky Way and the Solar System in terms of overall abundance. Under normal pressure and temperature, two of the element's atoms combine to form N2, an odourless and colourless diatomic gas. N2 makes up the majority of the Earth's atmosphere, making it the most common uncombined element.Nitrogen is found in all living things, primarily in the amino acids that make up proteins, the nucleic acids that make up DNA and RNA, and the energy-transfer molecule adenosine triphosphate.To learn more about nitrogen, refer to the following link:
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7. Which of the following is a molecule?????
(A) K (C) Na
(B) Ne (D) HI ......
Answer:
the answer is
(D) HI
Explanation:
Aspartate has three ionizable groups with pka values of 1.88, 9.60, and 3.65. what is the average net charge of aspartate at ph 3.65?
Aspartate has three ionizable groups with pka values of 1.88, 9.60, and 3.65. The average net charge of aspartate at ph 3.65 is - 0.5.
What Is Aspartate Amino Acid?Aspartate, like glutamic acid and glutamate, is the anion of aspartic acid. Aspartic acid is a -amino acid with a net negative charge. It is the most well-known form of amino acid that occurs in physiological conditions of the body.
Relation between Asparagine and aspartic acid. Asparagine's amide group is easily hydrolyzed to amino and carboxyl groups to form aspartic acid. This transformation is linked to the molecular basis of ageing. It is found on the surface as well as inside proteins due to the ability of the amide group of molecules to form hydrogen bonds.Asparagine is a derivative of aspartic acid, as we can see. In the carbon distal to the carbon, asparagine has an amide functional group. Aspartic acid has a carboxyl group in its acidic form.Asparagine's side chain has no electric charge, making it polar.The fundamental and primary distinction is that aspartic acid has a C4 carbon, whereas Asparagine has an amide group.Because asparagine residues can be changed to form complex carbohydrate chains, they are important. It can also form a cycle within a peptide or protein to produce an amide, which then opens to produce aspartic acid.Asparagine's main function as a -amino acid is that it can be used in the biosynthesis of proteins, whereas Aspartic Acid, due to its overall negative charge, plays an important role in the synthesis of other amino acids.Aspartic acid is also involved in the synthesis of citric acid and the urea cycle.Learn more about Aspartic acid here:-
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What is the most-correct statement about the polypeptide with the primary sequence atavistic?
The most appropriate answer among the option is a polypeptide with a primary sequence it contains four nonpolar neutral residues.
What is polypeptide?
A longer, unbroken, continuous peptide chain is known as a polypeptide. Peptides therefore belong to the wide chemical families of biological polymers and oligomers, along with nucleic acids, oligosaccharides, polysaccharides, and others.
A polypeptide with typically more than 50 amino acids is referred to as a protein. One or more polypeptides with a physiologically functional structure make up a protein. Proteins commonly interact with other proteins, other macromolecules like DNA or RNA, or intricate macromolecular complexes.
Amino acids that have been incorporated into peptides are called residues. A water molecule is released as a result of every amide connection.
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If 247.65 grams of barium hydroxide react completely, how many grams of water should theoretically be produced?
If 247.65 g of barium hydroxide react completely, the grams of water produced theoretically should be 52.03 g.
The balanced chemical equation for reaction is :
2HNO₃ + Ba(OH)₂ → 2H₂O + Ba(NO₃)₂
To calculate number of moles, we will use the equation:
Number of moles = Given Mass g
Molar Mass g/mol
Moles of Ba(OH)₂ -
Number of moles = 247.65 g = 1.4454 moles
171.34 g/mol
Stoichiometry is defined as the number before chemical formula in a balanced reaction.
According to stoichiometry, the limiting reagent is barium hydroxide as it limits the formation of product. Yields can only be found using limiting reagent.
1 mole of Ba(OH)₂ produces = 2 moles of H₂O
Therefore, 1.4454 moles of Ba(OH)₂ requires = 2.891 moles
Mass of H₂O is = moles × molar mass
= 2.891 × 18 = 52.03 g
Thus, the theoretical yield produced is 52.03 g
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(a) the element with one more proton in its nucleus than a chlorine atom
false assertion because An electron has a negative charge, whereas a proton has a positive charge. The element has one extra proton in its nucleus than a chlorine atom. The charges are opposing yet of equal magnitude.
A proton is what?A proton is a stable subatomic particle with the symbols p, H+, or 1H+ and an electric charge of +1 e. Its mass is 1836 times greater than that of an electron and only slightly less than that of a neutron.
A proton is a stable subatomic particle with the symbols p, H+, or 1H+ and an elementary electric charge of +1 e. Its mass is 1836 times that of an electron and slightly less than that of a neutron.
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What type of molecule is shown below?
A. Alkene
B. An Alkane-alkene
C. An alkane-alkyne
D. An alkane
Answer: Alkene
Explanation:
this hydrocarbon has a double bond so it is an alkene. it only needs to have 1 double bond in the formula.
if there were only C-C bonds in the molecule it would be an alkane. If there was a triple bond between 2 carbons it would be an alkyne.
