Answer:
2H+(aq) is the net ionic equation.
What would be the final temperature if 3.31 x
18.5 grams of water at 22.0°C?
The final temperature of the water is 64.59°C.
Given,
Heat (Q) = 3.31 x 103 J
Mass of water (m) = 18.5 gm
Initial temperature (Ti) = 22°C
Final temperature =?
Specific heat - The heat required to raise the temperature of a substance by one-degree Celcius. The relation between heat and temperature change is Q = m × c × ΔT.
where Q = heat energy
m = mass of the substance
c = specific heat of the substance
ΔT = change in temperature
Now, we will use the same formula to calculate the final temperature of the water-
Q = m × c × ΔT
Q = m × c × ( final temperature - initial temperature)
3.31 x 103 = 18.5 x 4.2 x (final temperature - 22)
(Specific heat of water (c) = 4.2 J/g degrees Celcius)
3.31 x 103 = 77.70 x (final temperature - 22)
3.31 x 103 / 77.70 = final temperature - 22
33100/777 = final temperature - 22
42.59 = final temperature - 22
Final temperature= 42.59 + 22 = 64.59°C
Hence, the final temperature of the water is 64.59°C.
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At stp, 1 mole of gas has a molar volume of 22.4 l. what is the density (g/l) of oxygen at stp?
The density of oxygen is 1.43 g/LC.
The periodic table's Group 16 (also known as the oxygen group) contains the nonmetallic chemical element oxygen (O). Oxygen is a colorless, odorless, and tasteless gas that is necessary for all living things. Animals take it up and then change it into carbon dioxide, which plants then use as a source of carbon and release the oxygen back into the atmosphere.
As well as reactions that remove elements from their combinations with one another, oxygen can react with nearly any other element to produce compounds. These reactions, which are frequently accompanied by the evolution of heat and light, are known as combustions. Water is the most significant component.
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0.45 g of hydrogen chloride ( hcl ) is dissolved in water to make 2.0 l of solution. what is the ph of the resulting hydrochloric acid solution? express the ph numerically to two decimal places.
The pH of the resulting solution formed by mixing HCl in water is 2.40.
The term pH, which stands for the potential of hydrogen, refers to a measurement of a substance's concentration of hydrogen ions (also known as protons). The pH of a solution provides important clues about its chemical makeup. Nutrient availability, biological function, bacterial behavior, and chemical behavior can all be impacted by pH.
pH = -log[H+], where [H+] is the concentration of H+ ions, is the formula used to determine the pH of any solution. The concentration of H+ ions is equal to the concentration of HCl because HCl is a strong acid and exhibits full dissociation.
Given mass of HCl = 0.45 g
Volume of solution = 2.0 L
We calculate the concentration of H⁺ ions as below:
M = n/V, where
V = volume
n = no. of moles
And no. of moles will be calculated as:
n = W/M, where
W = given mass
M = molar mass
Moles of 0.45 g of HCl = 0.45 g / 36.5g/mol = 0.0123mol
Now we put all these values in the above equation of concentration as:
M = 0.0123mol / 2.0L = 0.0061 M
We will put these values of concentration of H⁺ ions in the pH equation as:
pH = -log(0.006) = 2.22
Hence, 2.22 is the value of pH.
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Why is it necessary to couple some biochemical reactions to the hydrolysis of atp (for example, in the synthesis of glutamine from glutamic acid)?
It is necessary to couple some biochemical reactions because individually some biochemical reactions have +ΔG and coupling them together makes helps to make the overall reaction -ΔG.
Reactions that have a positive value of Gibbs free energy, require additional energy to complete, which can be obtained when it is coupled with the hydrolysis of ATP.
Also, the biochemical reaction which has a negative value of ΔG is non-spontaneous in nature. For those to become spontaneous, the value of ΔG should be negative. The coupling of reaction makes their Gibbs free energy negative and makes them spontaneous.
Therefore it is necessary to couple biochemical reactions to the hydrolysis of ATP.
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CuSO4 + BaCl2 → BaSO4 + ?
BaCl2 + CuSO4 → BaSO4 + CuCl2
A recipe for spaghetti sauce requires 2.5 cups of tomato sauce. If only metric
measures are available, how many milliliters of tomato sauce is needed?
(1qt = 4 cups, 1q = 946 mL)
The volume of the sauce required is 529.76 mL
What is the volume?
The volume has to do with the space that is occupied by an object. We can see that the unit that has been given for the spaghetti sauce is in the non standard unit of cups of tomato sauce. We are now asked to express this value in the metric unit of milliliter.
We have that;
1qt = 4 cups
x = 2.5 cups
x = 1qt * 2.5 cups/4 cups
x = 0.56 qt
Also;
1q = 946 mL
0.56 qt = 0.56 qt * 946 mL/1q
= 529.76 mL
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The height of water in a water barometer is 883 cm at 20˚c. The density of water at 20˚c is 0. 998 g•cm-3. What is the pressure?.
The pressure is 8.81 cm of Hg.
The height of the water in the water barometer is h.
h = 883 cm = 8.83 m
The density of water at 20 ° C is p.
p = 998 g/cm³
The gravity of the earth is g.
g = 1 m/s²
The pressure is,
Pressure = Height × Density × Gravity
P = h × p × g
P = 8.83 × 9.98 × 1
P = 8.81 cm of Hg
Therefore, the pressure is 8.81 cm of Hg.
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Which statement about the heliocentric theory is correct?
A. Heliocentric theory is a set of predictions describing the Sun as being the center of the solar system.
B. Heliocentric theory is a set of testable explanations describing the Sun as being the center of the solar system.
C. Heliocentric theory is a set of guesses describing the Sun as being the center of the solar system.
D. Heliocentric theory is a set of laws that describe the Sun as being the center of the solar system.
Please hurry I need this now T-T
A chemist wants to determine the molar mass of a naturally occurring substance isolated from spearmint. She adds 4.231 g of this substance to 25.00 g of acetone (C3H6O; molar mass 58.08 g/mol). The vapor pressure of the solution is determined to be 0.2474 atm at 25°C. If the vapor pressure of pure acetone at this temperature is 0.2630 atm, what is the mole fraction of the solvent in this solution? Give your answer to four significant digits.
The molar mass is 151 g/mol.
What is Raout's law?The Raout's law is used to describe the relationship between the partial pressures of the solution and that of the solute. Given that we have the partial pressure of the pure solvent is 0.2630 atm and the partial pressure of the solution is 0.2474 atm
Using Raout's law;
Psolution = Psolvent * mole fraction
Number of acetone = 25.00 g/58.08 g/mol = 0.43 moles
Number of substance = 4.231 g/ MM
Where MM = molar mass
0.2474 atm = 0.2630 atm * Moles of acetone/Total number of moles
Let the Moles of substance be x
0.2474 atm = 0.2630 atm * 0.43/0.43 + x
0.2474 = 0.113/0.43 + x
0.2474(0.43 + x) = 0.113
0.106 + 0.2474x = 0.113
0.2474x = 0.113 - 0.106
x = 0.113 - 0.106/0.2474
x = 0.028
Then;
x = 4.231 / MM
0.028 = 4.231 / MM
MM = 4.231 / 0.028
MM = 151 g/mol
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A pure titanium cube has an edge length of 2.81 in . how many titanium atoms does it contain? titanium has a density of 4.50g/cm3.
There are 2.05×[tex]10^{25}[/tex] titantium atoms in the cube.
How dense are atoms?Electrons are present in atoms. True, a large portion of the mass of an atom is concentrated in its tiny nucleus, but this does not imply that the rest of the atom is empty. It rather implies that the rest of the atom has a low density.STEP 1. Converting inches to cm
length in cm = 2.81 in*(2.54cm/1 in)
length in cm =7.1374
STEP 2: Determining mass of cube from the density
density = mass/volume
mass = density * volume
mass = 4.50 g/cm^2*(7.1374 cm) ^3
mass = 1635.18 g
STEP 3: Converting mass of titanium cube to number of atoms
no. of. Ti. atoms = 1636.18 g Ti * ( [tex]\frac{1 mol Ti}{47.867 g}[/tex]) ([tex]\frac{6.022*10^{23} atoms}{1 mol Ti}[/tex])
no. of. Ti. atoms = 2.058*10^25 atoms
Since the given values have 3 significant figures, the final answer must be:
no. of. Ti. atoms = 2.05*10^25 Ti atoms.
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If you have a sample of naphthalene than is contaminated with sodium sulfate (na2so4), what would be the best way to remove this impurity?
Dissolve the naphthalene in minimum amount of hot methanol and hot filter the suspension. Impure samples of naphthalene can be purified by sublimation.
Certain organic substances change directly from the solid to the gaseous state when heated, without going through the liquid state. This process is called sublimation. In this process, the naphthalene generated becomes smoke and impurities remain. Steam can be cooled by condensation. This method is very useful for separating volatile solids from non-volatile solids.
Impure sublimable organic compounds are placed in a porcelain dish and covered with perforated filter paper. Place a cotton-plugged funnel on top of the filter paper to prevent organic compound vapors from escaping. A porcelain bowl is gently heated.
Organic compounds sublimate and vapor rises through the holes in the filter paper into the funnel. Because the funnel is cooler than the bowl, vapors condense on the cool walls of the funnel to form pure crystals of organic compounds.
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The energy levels in which electrons orbit around the ____________ are also called ____________ .
The energy levels in which electrons orbit around the nucleus are also called electron shells.
All atoms contain electrons, protons and neutrons. The protons and neutrons are located in the center of the atom called the nucleus. Electrons orbit around the nucleus in electron orbits or shells.
Electron shells or energy levels are the paths followed by electrons as they orbit round the nucleus. The shells are used to determine an atom's electronic configuration and atomic structure.
The shells in an atom are given a number, starting from the innermost shell to the outermost shell, called the principal quantum number, denoted with the letter n. The farther away a shell is from the nucleus, the higher the energy level and the higher the principal quantum number.
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Phosphorus is atomic number 15. when it comes to bonding with other atoms, what is phosphorus most likely to do?
Phosphorus shares its valence electrons with other elements to form a covalent bond.
The electronegativity of an element largely determines its capacity for sharing or donation of electrons thereby forming covalent bond or ionic bond. Additionally, the charge to mass ratio is a major factor in this electronegativity.
The atomic number of phosphorus is 15, and its mass is 31. It is therefore a large atom with low electronegativity. Therefore, if a highly electropositive atom does not arrive to complete its electron needs, it is unable to take three electrons from other atoms to fulfil its charge. Thus, it favours sharing in most cases forming covalent bonds.
Phosphorus typically has 5 valence electrons, and the final 3 are required to complete its octet. It does, however, possess an open d-sub shell where its electrons can be excited, changing its number of valence electrons from 3 to 5. As a result, it shares those 5 electrons with the other elements to create 5 covalent bonds.
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Calculate the molarity of a 16. 45 g sample of nacl is dissolved in enough water to make 1. 000 l of solution
When 16.45 g sample of NaCl is dissolved in enough water to make 1.000 l of solution, the solution has a molarity equal to 0.2815 moles NaCl/L solution.
Molarity, or molar concentration, is defined as the number of moles of solute per liter of solution. It can be calculated using the formula given by:
M = n/v
where M = molarity
n = number of moles of solute
v = volume of solution
If the mass of the solute NaCl is 16.45 g, divide it with the molar mass of NaCl to get the number of moles of solute.
n = m/MM
n = 16.45 g/58.44 g/mol
n = 0.2814852841 moles NaCl
If 0.2814852841 moles NaCl is dissolved in enough water to make 1. 000 l of solution, solve its molarity.
M = n/v
M = 0.2814852841 moles NaCl/1.000 l solution
M = 0.2814852841 moles NaCl/L solution
M = 0.2815 moles NaCl/L solution
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Body System virtual lab can someone help me I will give brainlest
What is the nervous system?
The nervous system is made up of the brain, spinal cord and nerves. It controls much of what you think and feel and what your body does. It allows you to do things like walk, speak, swallow, breathe and learn. It also controls how the body reacts in an emergency.
What is the digestive system?
The organs that take in food and liquids and break them down into substances that the body can use for energy, growth, and tissue repair. Waste products the body cannot use leave the body through bowel movements.
Similarities (or how they function together):
When we eat, our brain sends signals to our digestive tract so that it can break down what we eat into smaller molecules for absorption into our bloodstream. The nervous system controls the digestive system by sending signals to the brain and organs.
Differences:
The nervous system controls all your senses, and movements. While the digestive system controls your food
I hope that helped!
A fictitious element x has an average atomic mass of 122. 224 u. Element x has two naturally occuring isotopes. The most abundant isotope has an isotopic mass of 121. 560 u and a relative abundance of 63. 89%. Calculate the isotopic mass of the least abundant isotope
Element x is unbibium has an average atomic mass of 122. 224 u and isotopic mass of the least abundant isotope is 237.03
Isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons and the number of protons in a nucleus determines the element's atomic number on the periodic table called isotopes
Unbibium, also known as element 122 or eka-thorium, is the hypothetical chemical element in the periodic table with the placeholder symbol of Ubb and atomic number 122 and unbibium has two isotopes ³⁷⁴Ubb and ³⁷¹Ubb and this abundant isotope has an isotopic mass of 121. 560 u and a relative abundance of 63. 89% and the isotopic mass of the least abundant isotope is 237.03
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3. The arrangement of particles demonstrated in the box on the right is called a hydration shell. In effect the copper metal becomes a complex ion with its surrounding water molecules. For metals other than group I and II, some water molecules are ripped apart due to their close association with the ions resulting in some H ions ending up in solution. This process can be expressed in the reaction shown below and can be called hydrolysis. What does the double arrow shown in the reaction tell us about the completion of the reaction, and what is actually found in the beaker: reactants, products, or both? (1) Cu(H₂O)6^2+ [Cu(H₂O)5(OH)]^+ + H+
In the beaker, we would find both reactants and products.
What is a reaction?The term reaction has to do with an interaction between reactants to give products. Sometimes, there is only a single reactant as we can see in the equation written as follows; [tex][Cu(H_{2} O)_{6} ]^{2+} ------- > [Cu(H_{2} O)_{5} (OH^-)]^+ + H^+[/tex]
In this case, a hydrogen ion leaves one of the water ligands to yield the species on the left hand side of the reaction equation. The double arrow in the reaction implies that this is a reversible reaction. A reversible reaction is one that could go either forward or backwards.
In a state of dynamic equilibrium, we always have the reactants and the products in the beaker. This is because, reactants are being converted to products and products to reactant at the same rate.
Hence in the beaker, we would find both reactants and products.
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What conditions are required for the formation of diamonds?
O great pressure squeezing atoms together
O heat and volcanic gases
O hot water
O dead plant and animal material
How many grams of solid sodium carbonate (na2co3, 105.99 g/mol) would be required to neutralize 1.0 l of 1.0 m hcl?
53 grams of solid sodium carbonate would be required to neutralize HCl.
Balanced chemical equation:
2HCl(aq) + Na₂CO₃(aq) → NaCl(aq) + H₂O(l) + CO₂(g)
V(HCl) = 1.0 l; volume of the hydrochloric acid
c(HCl) = 1.0 M; concentration of the hydrochloric acid
n(HCl) = c(HCl) × V(HCl)
n(HCl) = 1 mol; amount of the hydrochloric acid
From the balanced equation: n(HCl) : n(Na₂CO₃) = 2 : 1
n(Na₂CO₃) = 1 mol ÷ 2
n(Na₂CO₃) = 0.5 mol; amount of sodium carbonate
m(Na₂CO₃) = n(Na₂CO₃) × M(Na₂CO₃)
m(Na₂CO₃) = 0.5 mol × 105.99 g/mol
m(Na₂CO₃) = 53 g; mass of sodium carbonate
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Bohr’s model of the hydrogen atom, which restricts electrons to circular orbits around the nucleus parameterized by a single number, n, can best be applied to which other species?.
Bohr’s model of the hydrogen atom, which restricts electrons to circular orbits around the nucleus parameterized by a single number, n, can best be applied to any atom with one electron.
He⁺, Li²⁺, and Be³⁺ are examples of such atoms.
According to Bohr's atomic model, electrons revolve around the nucleus without emitting energy. K, L, M, and N are used to describe the energy shell. The energy is emitted or absorbed only when an atom jumps to a higher or lower orbit.
The energy equation is:
ΔE = hv
Where ΔE is the change in energy, h is the Planck constant, and v is the frequency.
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if you were to become a scientist what will be your contribution to the society? why?
Answer:
Reducing Plastic Waste and Pollution
Explanation:
If I were a scientist I would begin working on reducing the number of plastics that are left in landfills and other wastelands. The first solution that comes to mind is cloning a type of melee worm that feeds off of plastic and styrofoam rather than rotting foods and compost. This would be an extremely positive contribution to society because it would keep the earth from being filled with garbage.
What volume in ml of 0.3000 m nacl solution is required to produce 0.2150 moles of nacl?
710 mL volume in ml of 0.3000 m nacl solution is required to produce 0.2150 moles of nacl.
What is meant by moles?In chemistry, a mole, sometimes spelled mol, is a common scientific measurement unit for significant amounts of very small objects like atoms, molecules, or other predetermined particles. The mole designates 6.02214076 1023 units, which is a very large number. The International System of Units uses the mole (symbol: mol) as the unit of material quantity. How many elementary entities of a particular substance are present in an object or sample is determined by the quantity of that material. It is specified that the mole contains exactly 6.022140761023 elementary entities. The term "mole" refers to an extremely large quantity of molecules, atoms, or other particles and is used as a unit of measurement in chemistry.Molar Concentration = number of moles/ volume
volume = number of moles/ molar concentration
volume = 0.2150/ 0.3000 = 0.71 L
volume required = 0.71 L = 0.71L× 1000 mL/L = 710 mL
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If an aqueous solution has a hydrogen ion concentration of 10^-5 what is the concentration of m hydroxyl ion?
The concentration of hydroxyl ion is 10^-9 M.
When an electrolyte is dissolved in water, it dissociates into ions.
In the above case, the ions are hydrogen (H+) and hydroxyl (OH-).
At a temperature of 298 K,
The ionic product(Kw of water is
Kw = [H+] [OH-] = 10^-14
Here [H+] = Concentration of hydrogen ions
[OH-] = Concentration of hydroxyl ions
Assuming that the above solution is at a temperature of 298 K, the ionic product(Kw) of water is
10^-14 = [10^-5] [OH-]
[OH-] = 10^-9.
Thus, the concentration of hydroxyl ions is 10^-9 M.
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If you substituted the carbonyl in the peptide bond with a c-f bond, what would happen to the arrangement of an antiparallel beta sheets?
If you substituted the carbonyl in the peptide bond with a C-F bond, the strands would get closer together.
All of the amino acids could form a hydrogen bond with another amino acid in the chain to stabilize the secondary structure of a b-pleated sheet.
Protein is composed of amino acid linked with peptide bond.
Hydrogen bond is an electrostatic attraction between two polar groups that occurs when a hydrogen atom (H), covalently bound to a highly electronegative atom such as fluorine (F), oxygen (O) and nitrogen (N) atoms.
In a beta-pleated sheet, hydrogen bonds are formed between carbonyl and amino groups of backbone (see picture below).
Fluorine atom has greater electronegativity than oxygen atom in carbony group, so the hydrogen bond with hydrogen atom is shorter and strands are closer.
Electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.
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Which is the method of separating colouring ingredients in a sauce?
Answer:
Chromatography is a method of separating out materials from a mixture. Ink is a mixture of several dyes and therefore we can separate those colors from one another using chromatography. When ink is exposed to certain solvents the colors dissolve and can be seperated out.
ASAPPPP EASYYYY!!!
Total number of single, double, and triple bonds for C2H6(g).
_ _ _
Answer:
2 single, 0 double, and 1 triple
Explanation:
H-C≡C-H
Which of the responses includes all of the following that can form hydrogen bonds with water molecules? i. na , ii. ch3cooh, iii. c2h6, iv. ch3nh2
The responses that can form hydrogen bonds with water molecules are
II. CH₃COOH and IV. CH₃NH₂.
Acetic or ethanoic acid (CH₃COOH) has hydrogen atom bonded to an oxygen atom, so it can form hydrogen bonds with water molecules (see the picture below).
Methylamine (CH₃NH₂) has hydrogen atom bonded to a nitrogen atom, so it can form hydrogen bonds with water molecules.
Hydrogen bond is an electrostatic attraction between two polar groups that occurs when a hydrogen atom (H), covalently bound to a highly electronegative atom such as flourine (F), oxygen (O) and nitrogen (N) atoms.
Sodium (Na) and ethane can not form hydrogen bonds, because they do not have a hydrogen atom bonded to flourine (F), oxygen (O) and nitrogen (N) atoms.
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How many atoms of carbon (C) are present in the reactants of the following chemical equation?
C7H16+O2
CO2 + H₂O
(1 point)
O 7 atoms
16 atoms
O1 atom
O 23 atoms
The number of atoms present in reactants of the following chemical equation C₇H₁₆ + O₂ = CO₂ + H₂O is 7 atoms.
How to count number of atoms?The number of atoms in a compound is shown in the chemical formula of the compound.
A chemical formula is a notation indicating the number of atoms of each element present in a compound.
According to this question, the chemical reaction between heptane and oxygen is given as follows:
C₇H₁₆ + O₂ = CO₂ + H₂O
The chemical formula of hexane shows that carbon has 7 atoms in the reactant side.
Therefore, the number of atoms present in reactants of the following chemical equation C₇H₁₆ + O₂ = CO₂ + H₂O is 7 atoms.
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A 0.613 m solution of a weak acid has a ph of 2.708 at 303 k. what is the ka of the weak acid?
The Ka of the weak acid is 6.28 × 10⁻⁶.
Ka is the acid dissociation constant, which quantifies the extent of acid dissociation in water.
Balanced chemical reaction (dissociation) of an aqueous solution of a weak acid:
HA(aq) ⇄ H⁺(aq) + A⁻(aq)
pH = 2.708
c(H⁺) = 10⁻²°⁷⁰⁸
c(H⁺) = 1.96 × 10⁻³ M; concentration of hydrogen ions
c(H⁺) = c(A⁻); from balanced chemical reaction
c(HA) = 0.613 M - 1.96 × 10⁻³ M
c(HA) = 0.611 M; concentration of an acid in the solution
Ka = c(H⁺) × c(A⁻) / c(HA)
Ka = (1.96 × 10⁻³ M)² / 0.611 M
Ka = 6.28 × 10⁻⁶; the acid dissociation constant
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Draw a phylogenetic tree with 5 otus, label the nodes, include one polytomy, and circle aclade
Nodes are the points at the endpoints of branches that, at various moments in evolutionary history, represent potential or actual sequences.
A cladogram inner node that contains more than two immediate descendents on either side of it is referred to technically as having polytomy (i.e, sister taxa).
An organism and all of its offspring make up a clade. A "clade" would include all descendant species of the common ancestor of apes, for instance. Clade is derived from the Greek word klados, which means "branch" in English.
What is phylogenetic tree?
A phylogenetic tree is a branching diagram that shows the evolutionary links among various biological species. It is also referred to as an evolutionary tree or a phylogeny.
The idea that life evolves from lower to higher tiers like a ladder, referring to it be like the Great Chain of Being, is an outdated view of the "tree of life" that phylogenetic trees are known as. An early phylogenetic tree that includes a paleontological chart can be seen as a branching tree in early perceptions, drawings, and sketches. This mainly demonstrated how plants and animals have geological connections and relationships.
Nodes are the points at the endpoints of branches that, at various moments in evolutionary history, represent potential or actual sequences.
A cladogram inner node that contains more than two immediate descendents on either side of it is referred to technically as having polytomy (i.e, sister taxa).
An organism and all of its offspring make up a clade. A "clade" would include all descendant species of the common ancestor of apes, for instance. Clade is derived from the Greek word klados, which means "branch" in English.
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