The number electrons in the outermost orbit in the Bohr model of a Boron atom is 3. The outermost orbit of the electrons of a Boron atom is in the L-shell.
What is Bohr model?The Bohr model is a structural model of an atom where the electrons revolve around the nucleus of an atom in distinct circular orbits (shells). Each shell has a maximum number of electrons by this formula: 2n², where n is the principal quantum numbers (n = 1, 2, 3, 4, ...).
The 1st orbit called K-shell has the maximum electrons 2(1)² = 2.The 2nd orbit called L-shell has the maximum electrons 2(2)² = 8.The 3rd orbit called M-shell has the maximum electrons 2(3)² = 18.The 4th orbit called N-shell has the maximum electrons 2(4)² = 32.The 5th orbit called O-shell has the maximum electrons 2(5)² = 50.The composition of numbers of electrons in each shell of an atom is called electronic configuration.
Boron is an atom with the atomic number 5. So, it has 5 electrons. The electronic configuration is
K-shell = 2 electronsL-shell = 3 electronsL-shell is the outermost orbit in the Bohr model of a Boron atom.
Hence, the number of electrons in the outermost orbit in the Bohr model of a Boron atom is 3.
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assume that coal can be represented by the chemical formula c135h96o9ns . if 2.00 tons of coal is burned, what mass of nitrogen in the form of nox gases, is produced by this combustion?
If 2.00 tons of coal is burned, then the mass of nitrogen in the form of nox gases, is produced by this combustion is 400134 g of nitrogen.
The chemical reaction equation can be written as
C135H96O9NS + 156O2 ------- 135CO2 + 48H2O + NO + SO2
Mass of 2.0 tons of coal in gram = 1.814 × 10^(6) g
Molar mass of C135H96O9NS can be calculated as = 135(12) + 96(1) + 14 + 32 = 1904 moles of coal
Now, number of moles of coal burned = 1.814 × 10^(6) g / (1906 g/mol) = 952.7 moles of coal
If 1 mole of coal produced 1 mole of NO
Total 952.7 moles of coal produced 952.7 moles of NO
Mass of NO can be calculated as
Mass of NO produced = 952.7 × 30 = 28581 g
1 mole of NO = 30 g of NO
Thus, 14 g of nitrogen is contained in 30 g of NO
Let xg of nitrogen is contained in 28581 g of NO
Then,
x = 14 × 28581 = 400134 g of nitrogen.
If 2.00 tons of coal is burned, then the mass of nitrogen in the form of nox gases, is produced by this combustion is 400134 g of nitrogen.
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in your own opinion, is alchemy a real science? do you believe the claims? give reasons and explanation to support your answers.
Alchemy was a form of speculative thought that, among other aims, tried to transform base metals such as lead or copper into silver or gold. It also sought to discover cures for diseases and a way of extending life.
Today we know that the universe is made up of atoms and elements. Since lead and other metals are not composed of fire, air, earth, and water, it's not possible to adjust the percentages of those elements and turn them into gold.
(Unfortunately, it turns out that alchemy, at least in its purest form, can’t be done. You can’t turn any metal into gold, no matter how much sorcery or chemicals or mystical charms you use. )
I hope I helped
when aluminum (al) reacts with oxygen (o2) in a synthesis reaction, what is the chemical formula of the product? group of answer choices alo2 none of these options al2o3 al3o2
This is a synthesis reaction we're given that aluminium (Al) can react with oxygen gas (O2 to produce aluminium oxide (Al2O3).The balanced chemical equation for this reaction is 4Al(s)+3O2(g)→2Al2O3(s)
When two separate atoms or molecules interact to create a new compound or molecule, the process is known as a "synthesis reaction." The majority of the time, energy is released and an exothermic reaction takes place during a synthesis reaction. An endothermic result is also conceivable, though. When sodium (Na) and chlorine (Cl) are combined, sodium chloride is created. This is an illustration of a synthesis reaction (NaCl). Al2O3 is the chemical formula for the compound of aluminium and oxygen known as aluminium oxide. It is precisely referred to as aluminum(III) oxide and is the most prevalent of various aluminum oxides. Aluminum oxide is utilized for its strength and hardness.
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how would you observe the spectra of elements with higher ionization energies such as hydrogen or helium?
If a hydrogen atom could have any value of energy, then a continuous spectrum would have been observed, similar to blackbody radiation.
What is ionization energy ?
Ionization energy (also called ionization potential) is the amount of energy required to remove an electron from an isolated atom or molecule in chemistry and physics. There is an ionization energy for each successively removed electron. However, the ionization energy associated with the removal of the first (most loosely held) electron is most commonly used.
The ionization energy of a chemical element, expressed in joules or electron volts, is usually measured in a discharge tube in which rapidly moving electrons produced by an electric current collide with gas atoms of the element, releasing one of them. will be electronic.
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a nucleoside triphosphate containing a 5 carbon deoxyribose sugar and the nitrogenous base thymine would be called:
A nucleoside triphosphate containing a 5-carbon deoxyribose sugar and the nitrogenous base thymine would be called a thymidine monophosphate.
Nucleotides are comprised of three components: a nitrogenous base, a pentose sugar, and one or more phosphate groups. Each of these elements is referred to as an "n" (nucleotide), so when we combine them all together, we get nucleotides like dATP and dTTP.
Thymidine is the name of the parent nucleotide from which derivative nucleotides are made. Thymidine monophosphate contains thymine and a phosphate group, which makes it different from other nucleotides. In this case, it has one phosphate group attached to its 5-carbon deoxyribose sugar, which is also called deoxyribonucleic acid (DNA).
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Which best explains how the chemical reaction shown below follows the law of conservation of mass? 2H2 + O2 → 2H2O
The given equation is showing the law of conservation of mass as the number of hydrogen and oxygen atoms are same on the both sides of the equation.
What is the chemical equation?A chemical equation can be described as the representation of a reaction in terms of chemical symbols of the substances. A chemical equation possesses of participating reactants in the reaction, formed products, and an arrow representing the direction of the chemical reaction.
The chemical equation in which the number of atoms of each element is equal on either side of the equation is called a balanced chemical equation.
The law of conservation of mass obeys by every balanced chemical equation. By following law of conservation, the total mass of the chemical elements on the reactant side should be equal to the total mass of chemical elements on the product side in a balanced chemical equation.
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play with the simulation to determine: a) which particles affect the stability of the atom? b) which particles do not affect the stability of the atom?
a) Neutrons or protons are the particles that have an impact on the stability of the atom.
b) Electrons are the particles that have no impact on the stability of the atom.
When an element's atoms have excess neutrons or protons, the extra energy produced in the nucleus causes the atom to lose its equilibrium or become unstable.
Whether or not an atom's outermost shell is filled with electrons determines how stable the atom is. The molecule is stable if the outer layer is full. To attain stability, vacant outer shell atoms often form chemical interactions with other atoms.
Radioactivity is the capacity of some unstable atoms to spontaneously release nuclear radiation, often in the form of alpha and beta particles associated with gamma rays. The nucleus of an atom might become unstable if there are too many neutrons or protons present.
By ejecting other particles, such as neutrons and protons, or by emitting radiation in a variety of ways, a radioactive atom will attempt to become stable. Thus, the atom's electrons are the only internal particle that has no impact on the atom's stability.
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Which of the electron transitions involves the most energy? Explain why this transition involves the most energy based in your understanding of the attractive forces between the electrons and protons in the atom
The attraction between the electron and the atom's nucleus grows stronger as it travels closer to it. The electron goes to a lower potential energy. The electron transition involves the most in n=6 and n=2.
More energy must be changed for a larger movement. The electric charge of the electron, a subatomic particle, is a negative one elementary charge. Due to their lack of known components or substructure, electrons, which are part of the first generation of the lepton particle family, are typically considered to bepotential energy.
The energy that an object retains due to its position in relation to other objects, internal stresses, electric charge, or other factors is known as potential energy in physics.
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Question 9(Multiple Choice Worth 4 points)
(01.03 MC)
Ô
Object A has a mass of 12 g and a volume of 8 cm³. Object B has a mass of 20 g and a volume of 8 cm³. Which object has a greater density and by how much?
O Object A, by 1 gram per cubic centimeter
O Object A by 8 grams per cubic centimeter
O Object B, by 1 gram per cubic centimeter
O Object B, by 8 grams per cubic centimeter
According to the given statement Object B, by 1 gram per cubic centimeter object has a greater density.
What is density ?The measure of how densely a substance is pressed together is called density. As the weight per unit volume, it meets that definition. The formula for density, denoted by the symbol D, is given as follows: density = m/V, where m denotes the object's mass and V its volume.
Does mass affect density?Mass and volume are intimately linked with density. In reality, it explains the precise nature of the connection between the two. By dividing the mass of an object by its volume, we may get its densities. The mass is said to have a low population density if it has a high volume but a tiny mass.
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which one of the following salts, when dissolved in water, produces the solution with the lowest ph? a) alcl3 b) nacl c) mgcl2 d) nh4cl
AlCl3 is the answer.
As strong acid-strong base salts, NaCl and MgCl2 are both neutral.
Since NH4Cl is a weak base-strong acid salt, it is also acidic. AlCl3 is, nevertheless, a stronger acid than NH4Cl.
Neither acids nor bases can be found in neutral substances. Accordingly, neutral substances have an equal number of these ions. An acid has hydrogen ions, a base has hydroxyl ions, etc. Water is the most typical example of a neutral substance. Both acidic and basic properties are absent from water.
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A typical Heliox mixture contains He at a partial pressure of 0.75 atm and O2 at a partial pressure of 0.35 atm. What is the total pressure of the Heliox mixture?
Considering the Dalton's partial pressure, the the total pressure of the Heliox mixture is 1.1 atm.
Dalton's partial pressureDalton's law states that the total pressure of a gas mixture is equal to the sum of the pressures that each gas would exert if it were alone:
[tex]P_{T}[/tex]= P₁ +P₂ + ... + Pₙ
where n is the amount of gases present in the mixture.
This relationship is due to the assumption that there are no attractive forces between the gases.
Total pressure of the Heliox mixtureIn this case, the total pressure of the Heliox mixture is calculated as:
[tex]P_{T} =P_{He} +P_{O_{2} }[/tex]
Being:
[tex]P_{He}[/tex]= 0.75 atm[tex]P_{O_{2} }[/tex]= 0.35 atmthe total pressure of the Heliox mixture is
[tex]P_{T}[/tex]= 0.75 atm + 0.35 atm
[tex]P_{T}[/tex]= 1.1 atm
Finally, the total pressure is 1.1 atm.
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How can you describe carbohydrates
3. using the 1h nmr spectrum shown below. a) confirm the identity of the compound using the nmr provided. is this consistent with acetophenone (starting material) or the benzoic acid (product)? b) using the table below list the 4 signals shown. include chemical shift in ppm, multiplicity and number of protons. for calculating the number of protons, use the integration curves provided in the nmr and a ruler. c) support your answer in a) using the data obtained from the nmr. explain using the peak(s), or absence of peak(s), that sustain the identity of the compound.
Since 2 2.60 PPM singlet was seen for the /C-CH, Proton, and IHNMR data clearly showed the presence of acetophenone. IHNMR chemical with a multiplicity of 2.60 PPM is singlet, and there are 3 photons in total.
IHNMR chemical with a multiplicity of multiple number of photons of 7.49 to 7.45 PPM and a Proton number of 1. acetophenone number of photons in an IHNMR chemical with a multiplicity of 7.60 - 7.55PPM is multilaterally 2. IHNMR Chemical of multiplicity 7:98 - 7.94 PPM is multiplet no. of Proton is 2. So, Acetophenone chemical will be administered. Only one at proton comparatively shielded opposition and miter will give multiple in the benzene ring according to the IHNMR value of one singlet observed at 2–6 1 PPM. OxfordCryosystems.
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2. What substances make up water?
Order the sequence of ideas that led to the current model of the atom. Place a number in front of each event to show the correct order.
The correct sequence of ideas that led to the current model of the atom is as follows:
1. Dalton developed the theory that all matter is made of atoms.
2. Thomson discovered that atoms contain electrons.
3. Rutherford discovered that atoms have a nucleus.
4. Bohr developed the model in which electrons orbit the nucleus.
5. Schrödinger developed the electron cloud model of the atom.
What is an atom?An atom is the smallest unit of a chemical element that can take part in a chemical reaction.
The atomic theory of matter is the theory that all matter is composed of atoms.
Atoms are composed of electrons, protons, and neutrons.
Several scientists contributed ideas that led to the current model of the atom. These scientists include:
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Complete question:
Order the sequence of ideas that led to the current model of the atom. Place a number in front of each event to show the correct order.
Rutherford discovered that atoms have a nucleus.
Dalton developed the theory that all matter is made of atoms.
Schrödinger developed the electron cloud model of the atom.
Bohr developed the model in which electrons orbit the nucleus.
Thomson discovered that atoms contain electrons.
what is the real gas pressure exerted by 1.00 mol of o2 at 300. k in 2.41 l if the ideal pressure is 10.0 atm?
the real gas pressure for above question was 91.4atm
what is van der waals equatio?
The Van der Waals equation (or Van der Waals equation of state) is an equation of state used in chemistry and thermodynamics that extends the ideal gas law to take into account the effects of interactions between molecules in a gas as well as accounting for the finite size of the molecules.
The ideal gas law views gas molecules as point particles that interact only with their surroundings and not with one another, which means that when they collide, they do not occupy any space or change their kinetic energy.
The volume V occupied by n moles of any gas has a pressure P at a temperature T determined by the following relationship, according to the ideal gas law, where R is the gas constant:
PV=nRT
(pxn2a/v2) (v-nb)=nRt
p 10x1.36/2.41x2.41-10x0.0318
p 13.6/2.41x2.092
nRt=p2.69
10x0.08206x300/2.69
=91.4atm
therefore the real gas pressure =91.4atm
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what causes the lines in these spectra? why are the colors of the lines different? suggest a reason for the observation that the spectrum of calcium is more complicated than the spectrum of hydrogen.
Transitions of electrons within atoms or ions form spectral lines at different rungs which leads to emission of lines of different colors. Spectrum of calcium is more complicated than the spectrum of hydrogen because calcium atom have more electrons than hydrogen.
What are spectral lines?A spectral line in an otherwise smooth and continuous spectral is a dark or bright line resulting from the emission or absorption of light in a narrow frequency range compared to adjacent frequencies. Spectral lines are frequently used to identify atoms and molecules.
The spectral lines arise from electron transitions within an atom or ion. As electrons move toward or away from the nucleus (or ion) of an atom, they release or absorb energy in the form of light (or other radiation).Electrons fall on the lower rung and emit light with the energy of the rung difference. This allows different atoms to emit different colors of light.Calcium has a more complex spectrum. Because calcium has more electrons than hydrogen, there are more possible electronic states and transitions.To know more about spectral lines visit:
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The higher the frequency of light, the ___ its wavelength and the ___ its energy.
a. longer, lower
b. longer, higher
c. shorter, lower
d. shorter, higher
Answer:
c
Explanation:
why does recovered singal have 3 or 4 volatge level instead of 2 levels as you would excpect for a digtal signal
The digital signal is a signal that encodes data as a series of discrete values; at any one moment, it can only take on a maximum of one of a finite set of values.
A digital signal, in contrast, represents continuous values; it always reflects a real number within a continuous range of values. Information is represented by simple digital signals in discrete analogue level bands. The same information state is represented by all levels in a band of values. The signal in the majority of digital circuits can have two legitimate possible values; this is known as a binary signal or logic signal.
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the same physical property that helps drive the reaction to completion can also stall out the reaction before it starts. what do we do in the procedure that helps minimize this concern?
Physical characteristics are those that can be seen without affecting a substance's identity.
Physical characteristics are therefore those that can be seen without affecting a substance's identity.
What is physical property ?Any measurable characteristic whose value describes the condition of a physical system is referred to as a physical property. A system's transitions between fleeting states can be described by changes in its physical attributes. Observables are a term used to describe physical characteristics. These attributes are not modal.
Color, hardness, malleability, solubility, electrical conductivity, density, melting point, and boiling point are examples of the physical characteristics of matter. The hue of the elements does not differ much from one element to the next.
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when 100 cm3 of 1.0 moldm-3 hcl is mixed with 100 cm3 of 1.0 moldm-3 naoh, the temperature of the resulting solution increases by 5.0 c what will be the temperature change
Temperature remains the same as the amount of heat and the concentration remains the same..
When 100cm3 of 1.0 mol dm-3 hcl is mixed with 100 cm3 of 1.0 mol dm-3 of NaOH the temperature remains the same. Here, the volume of the solution gets half .mass and heat released reduced by half.so, temperature remains the same as the concentration of the solution does not change.concentration of the solution is the amount of solute present in the given solution.
So, the temperature remains the same as 5C.We know this from calculating heat exchange using specific heat capacities.This process explains when two or more substances at different temperature are brought together to the environment they eventually reach the same temperature.
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hydrochloric acid, hcl, is frequently used for titrations, but making a precise molarity of hcl is very difficult. instead, an approximate solution of hcl is made and then analyzed by titration with sodium hydroxide to determine its precise molarity. the titration reaction is hcl naoh nacl h2o. if 26.18 ml of 0.0995 m naoh is required to titrate 25.00 ml of hcl, what is the molarity of the hcl?
The molarity of the HCl 0.104 M
What is molarity?Molarity of a solute is defined as the ratio of number of moles of solute to the volume of solution (L). Solute molarity is sometimes omitted by enclosing the solute chemical formula in square brackets. For example, the concentration of chloride ions in solution can be written as [Cl⁻]. Molarity allows you to convert between the volume of a solution and the moles (or mass) of a solute.
For the given case,
HCl + NaOH --> NaCl + H2O
Since,
M₁V₁ = M₂V₂
M₁ = concentration of NaOH
V₁ = volume of NaOH
M₂ = concentration of HCl
V₂ = volume of HCl
Substitute the given values in the equation mentioned above:
26.18 × 0.0995 = M₂ × 25.00
2.60491 = 25 M₂
M₂ = 0.104 M
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If you were camping in a rainforest for two days, your presence would cause many changes to the
surroundings. Describe two physical and two chemical changes that could occur as a result of your
experience
Here are 3 alkali metals with physical and chemical similarity.
What is alkali metals?
Alkali metals are come from the fact that when these metals or their oxides dissolved in water.a basic solution results.
Three alkali metals -
1- hydrogen(H)
2-lithium(Li)
3-potassium(K)
physical and chemical similarity of hydrogen -
-it is colourless and tasteless in nature.
-it is a combustible gas but not a supporter of combustion.
physical and chemical similarity of lithium -
-it have a melting point of 180.54
-it is the lightest of all metals,with a density approximately half that of water.
physical and chemical similarity of pottasium -
- this metal is soft and white with a silver lustre.
-it imparts a lavender colour to a flame, and it's vapour is green.
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explain why the water strider is able to land on the surface of the water. use your knowledge of intermolecular forces and draw a particle diagram to justify your explanation
Water striders use the high surface tension of water and long, hydrophobic legs to help them stay above water.
Surface tension:
The tension of the surface film of a liquid is caused by the attraction of the particles in the surface layer by the bulk of the liquid, which tends to minimize surface area.
The force responsible for surface tension is the cohesive force that is present between the molecules of the liquid, the surface tension of water is high this is just because there is a hydrogen bond present between the molecules of water.
As we know that the legs of a water strider are long and slender, allowing the weight of the water strider's body to be distributed over a larger surface area.
Therefore the water strider can land on the surface of the water because of the surface tension of the water.
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consider a situation in which you analyze a mixture of the starting alcohol and the alkene product of an elimination reaction using tlc. if you used a reverse phase tlc plate, which compound would have the higher retention factor? group of answer choices the alkene
Alcohol would have the higher retention factor .
What is Alcohol ?A molecule that can be found in alcoholic beverages like beer, wine, and liquor. Additionally, it can be discovered in several medications, mouthwashes, home goods, and essential oils. It is produced through the chemical process of fermentation, which makes use of yeast and sugar.
The four different forms of alcohol are rubbing, isopropyl, denatured, and ethyl. Ethyl alcohol, commonly known as ethanol or grain alcohol, is the one that we are most familiar with and adore. It is produced by fermenting sugar and yeast and is a component of beer, wine, and alcoholic beverages.Alcohol found in beverages is known as ethanol. It is created when the carbohydrates in grains, fruits, and vegetables are fermented by yeast. For instance, the sugar in potatoes is used to make vodka and the sugar in grapes to make wine.To know more about Alcohol please click here ; https://brainly.com/question/947751
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a gas mixture of xe, ne, and ar has a total pressure of 12.20 atm. what is the mole fraction of xe if the partial pressures of ne and ar are 2.10 and 4.50 atm, respectively?
6.6 is the mole fraction of xe if the partial pressures of ne and ar are 2.10 and 4.50 atm, respectively.
Why is partial pressure called?The idea of partial pressure is driven by the fact that each individual gas contributes to the overall pressure in a given proportion, which corresponds to its partial pressure. In order to characterize all the pieces, it is essentially equivalent to taking a % or proportion of the whole.
Briefing:The total pressure is equal to the sum of the individual pressures, according to Dalton's law.
Ptotal = total pressure of gases = 12.20 atm
Pne = partial pressure of ne = 2.10 atm
Par = partial pressure of ar = 4.50 atm
Pxe = partial pressure of xe = ?
putting in the values we get:
12.20 = 2.10 + 4.50 + Pxe
Pxe = 5.6
We employ Dalton's law to determine the solution's vapor pressure, which is:
Ptotal = (Pxe + Xxe)
We are given:
Pxe = partial pressure of xenon = 5.6
Xxe = mole fraction of xenon = ?
Using the values in the aforementioned equation, we get:
12.20 = (5.60 * Xxe)
Xxe = 6.6
The mole fraction of Xe is 6.6 as a result.
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what is math and science?
Mathematics and science are formal and exact sciences that are based on logic.
What is math and science?Mathematics is an exact science that studies the properties and relationships between entities through geometric figures and arithmetic with numbers. Mathematics then looks for common patterns that could end up leading to a theory and, if it is verifiable and true, end up being a law, such as the Pythagorean law for example.
In terms of science, it is the comparable knowledge that has been studied, explained, and has helped predict social and natural phenomena in our universe over time. This has been done and verified through the scientific method, making it then a verifiable and true logic.
Therefore, we can confirm that mathematics and science are formal and exact sciences that are based on logic.
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A compound of hydrogen, chlorine, and carbon has a simplest formula of CCIH₂. If in one of its molecules there are two carbon atoms, find its molar mass.
Answer:
99 g/mol
Explanation:
2 carbon atoms in one molecule means double all the other atoms
(12*2)+(35.5*2)+(1*4)=99g/mol
3 straight chains of 12 carbon atoms are shown. 2 oxygen atoms are at the end of each row and connect the carbon atoms to a row of 3 carbon atoms. each carbon atom is attached to hydrogen atoms. which type of lipid is shown? a saturated phospholipid a saturated triglyceride an unsaturated phospholipid an unsaturated triglyceride
Three straight chains containing 12 carbon atoms, 2 oxygen atoms at the end is a saturated triglyceride.
What are saturated triglycerides?
Saturated triglycerides contain entirely of carbon-carbon single bonds in the structure. They have higher melting point compared to unsaturated triglycerides. Consuming saturated triglycerides in the large amount may lead to several cardiovascular diseases. Foods with high concentration of saturated triglycerides are butter, some fatty meats and cheese.
The saturated triglycerides are made up of carbon-carbon single bonds containing maximum number of hydrogen atoms. Unlike, saturated fats, unsaturated fats have carbon-carbon double bonds in them.
Therefore, 3 straight chains containing 12 carbon atoms, 2 oxygen atoms at the end is a saturated triglyceride.
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A car travels 45 km at a speed of 60 km/h. How long does it take the car
to reach its destination?
Answer:
45 mins
Explanation:
it takes 45 minutes long