Answer: Matthias Schleiden helped to establish Cell theory that concluded all plant tissues are made of cells and embryonic plant arose from a single cell. Whereas Theodor Schwann told that both animals are made up of cells and these cells have independent lives.
Explanation:
In 1838, Matthias Schleiden, a German botanist, concluded that all plant tissues are composed of cells and that an embryonic plant arose from a single cell. He declared that the cell is the basic building block of all plant matter. This statement of Schleiden was the first generalizations concerning cells.
This statement of Schleiden was the first generalizations concerning cells. Schleiden investigated plants microscopically and conceived that plants were made up of recognizable units, or cells. He thought plant growth came about through the production of new cells, which, he speculated, came from the nuclei of old cells. Although later discoveries proved him wrong about the role of the nucleus in mitosis, his conception of the cell as the common structural unit of plants shifted study from to processes going on in a living cell.
Schwann concluded three things that became vital components of the cell theory. First, Schwann concluded that both plants and animals were composed of cells. Second, these cells have independent lives. Third, these independent lives are subject to the organism's life.
The cell is the basic unit of life. This statement was the second generalization concerning cells and is the most important in the development of biology.
It became known as the cell theory.
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rank the following periods of time in order of their duration, from longest to shortest, as seen from a location on mercury: revolution (year), rotation (sidereal day), solar day (synodic day, or noon-to-noon), period of daylight or darkness.
The correct order is: Revolution> Solar day> Rotation> Period of daylight or darkness.
Revolution:
According to the stars, the Earth orbits the sun in 365 days, 6 hours, and 9 minutes, rotating at a speed between 29.29 and 30.29 km/s. Every fourth year, which is known as a leap year, the 6 hours, 9 minutes add up to roughly one extra day. The extra day added is February 29th.
Solar Day:
A solar day lasts roughly 24 hours on Earth. The Earth's orbit is not a perfect circle because it is elliptical. This implies that certain solar days on Earth are somewhat longer than 24 hours and some are slightly shorter.
Rotation:
The Earth has an inclination of 23.45 degrees from the plane of its orbit around the sun, and revolves on its axis in relation to the sun every 24.0 hours mean solar time. The differences brought on by the non-circular orbit of the Earth are averaged out to create mean solar time.
Period of daylight:
At the equator, day and night are always twelve hours long, with the exception of two tiny effects that lengthen day by roughly eight minutes.
Hence the order is Revolution> Solar day> Rotation> Period of daylight or darkness.
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Question 3
In the titration described in the previous problem, EDTA binds calcium ions with 1:1 stoichiometry.
If you begin the titration with a beaker containing 247mL of CaCl2 solution, and observe a color change after adding a total of 36.8 mL of 1.69M EDTA solution, what was the molar concentration of the initial CaCl2 solution?
Please enter your answer as a decimal (not scientific notation), using three significant figures.
To calculate the Molar Concentration, we will find the molar concentration by dividing the moles by liters of water used in the solution. The concentration of the initial CaCl2 solution of Ca2+ in CaCl2 solution is 42 mEq/L.
What is molar concentration?
Molarity is a measure of the concentration of a chemical species, especially a solute, in solution and is expressed as the amount of substance per unit volume of solution.
Therefore, To calculate the Molar Concentration, we will find the molar concentration by dividing the moles by liters of water used in the solution. The concentration of the initial CaCl2 solution of Ca2+ in CaCl2 solution is 42 mEq/L.
equation:-
[tex]1:1 stoichiometry,.36.8 mL of 1.69M EDTA solution[/tex]
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list the following transition metal coordination compounds by their d electron count, with the highest at the top and the lowest at the bottom.
The transition metal coordination complexes [NiCl4]2- and [Co(H2O)]3+ have the highest and lowest d electron counts, respectively. [Fe(OH2)] 3+, [MnO4]-.
What or who are electrons?An electron is a subatomic particle with a negative charge that can be either free or bonded to an atom (not bound). An atom has three different sorts of constituents, two of which are particles and one of which is an electron that is bound to it.
What do atoms and electrons actually do?The parts of an atom with negative charges are referred to as electrons. The charge of an atom's proton in the nucleus is balanced by the total negative charge of the atom's electrons.
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Part III: To which side of a Water Molecule are these Attracted?
Magnesium
Sulfur
Iron
Chlorine
Potassium
Bromine
Calcium
Helium
Nitrogen
Part IV: Polar or Non-polar?
Cooking oil
Ionic Compounds
Sugar
Salt
A compound with H's
Insoluble in water
Soluble in water
Dissolves in water
Part V: Which one will dissolve the fastest?
1. Powdered sugar or granulated sugar?
2. In hot water or in cold water?
3. Stirred or not stirred?
4. Large particles or small particles?
The Magnesium atom with very little electron density attracts the Oxygen side of the water which has a partial negative charge.
What is oxygen?
Oxygen is a chemical element with the symbol O and atomic number 8. It is a member of the chalcogen group of the periodic table, a highly reactive nonmetal and an oxidizing agent that readily forms oxides with most elements as well as other compounds. Oxygen is the most abundant element on Earth and the third most abundant element in the universe after hydrogen and helium. At standard temperature and pressure, two atoms of the element combine to form dioxygen, a colorless, odorless diatomic gas with the formula O2.Diatomic oxygen gas currently makes up 20.95% of Earth's atmosphere, although this has changed considerably over long periods of time. Oxygen makes up almost half of the earth's crust in the form of oxides.To know more about oxygen, click the link given below:
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What are the oxidant states of the atoms in a diatonic gas
Answer:
If it is elemental gas, the oxidation number is $$0$$.
Explanation:
The oxidation number of an atom in a chemical bond, is the charge left on the atom
Using hard-soft concepts, which of the following reactions are predicted to have an equilibrium constant greater than 1? (a) R3PBBr3 + R3NBF3 = R3PBF3 + R3NBBr3 (b) SO2 + (C6H5)3PHOC(CH3)3 = (C6H5)3P SO2 + HOC(CH3)3 (c) CH3HgI + HCl = CH3HgCl + HI (d) [AgCl2]- (aq) + 2CN- (aq) = [Ag(CN)2]- (aq) + 2Cl- (aq)
Options b) and d) are correct . In these two cases equilibrium constant is greater than 1.
What hard and soft acids?
Hard acid means which are Small, highly charged (the charge criterion mostly applies to acids, to a lesser extent to bases), and poorly polarizable. Soft applies to species which are big ,have low charge states and are strongly polarizable.
a) In case of first reaction BF3 is harder acid than BBr3 , so K<1
b) HOC(CH3)3 is harder acid ,so K>1
c) reaction will shift towards reactants side ,so K<1
d) Reaction will shift towards right ,so K>1
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Please help I have less than 9 minutes
Calculate the formal charge of (CH3)3NO by considering its resonance
The formal charge of (CH3)3NO by considering its resonance Oxygen, -1; Nitrogen, +1.
How to calculation formal charge?
The hypothetical charge that an atom in a molecule would have if the electrons in the bonds were distributed uniformly among the atoms is known as the formal charge. Another way to state this is that formal charge is created by subtracting the nonbonding electrons from the amount of valence electrons on a neutral atom, followed by the number of bonds that connect that atom to other atoms in the Lewis structure.
As a result, we determine formal charge as follows:
Formal charge:= # electrons in the free valence shell of the atom,- # lone pair electrons, -1/2 # bonding electrons.
By calculating the formal charges for the entire structure, we can double-check our results. The total formal charge of every atom in a molecule must be zero, and the total formal charge of an ion must be equal to the ion's charge.
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The water-gas shift reaction is important in several chemical processes, such as the
production of H₂ for fuel cells. This reaction can be written as follows:
H₂(g) + CO₂(g) → H₂O(g) + CO(g)
with K = 0.106 at 700 K. If a mixture of gases that initially contains 0.632 M CO2 and 0.570
M H₂ is allowed to equilibrate at 700 K, what is the final concentrations of CO?
To solve this problem, we can use the equilibrium constant expression for the water-gas shift reaction:
K = [CO][H2O] / [CO2][H2]
where [CO], [H2O], [CO2], and [H2] are the equilibrium concentrations of the respective species.
We are given the value of K and the initial concentrations of CO2 and H2. We can use these values to solve for the equilibrium concentration of CO.
First, we need to set up the equilibrium constant expression:
K = [CO][H2O] / [CO2][H2]
We are given that K = 0.106 and [CO2] = 0.632 M. We can substitute these values into the equation:
0.106 = [CO][H2O] / (0.632 M)(0.570 M)
We can then solve for [CO] by multiplying both sides of the equation by (0.632 M)(0.570 M) and rearranging:
[CO] = (0.106)(0.632 M)(0.570 M) / (0.632 M)(0.570 M)
[CO] = 0.106
Thus, the final concentration of CO is 0.106 M.
2HCl+Mg=H2+MgCl2.What is the molarity of a HCl solution if the reaction of 50.0mL of the HCl solution with excess magnesium produces 4.20L of H2 gas at 737mmHg and 25∘C ?
Answer:5
Explanation:
in the presence of strong base, such as sodium hydroxide, d-glucose can epimerize to d-mannose (the c-2 epimer of d-glucose) through d-fructose (a ketose). which of the following intermediates is/are present during the mechanism?a. presentb. not present
Because the molecules are the same except for the C4 position, D-glucose and D-galactose are epimers. Both structural isomers of glucose and fructose share the chemical formula C6H12O6.
Is mannose a glucose epimer, or not?Mannose is a sugar monomer from the aldohexose group of carbohydrates and a C-2 epimer of glucose. Mannose plays a crucial role in human metabolism, notably in ensuring that native proteins are correctly glycosylated.
They belong to a particular class of stereoisomers that feature several stereocenters but vary from one another based on the arrangement of a single stereogenic center. Mannose and glucose differ from one another in terms of their conformation at the C-2 atom. Consequently, they are epimers.
Epimers of D-glucose include D-mannose and D-galactose.
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Identify the patterns in the data. Try to explain why those patterns might be occurring.
The pattern here is Non-symmetrical or bimodal.
How can you see patterns in data?
Data patterns are frequently explained in terms of their centre, spread, form, and peculiar characteristics. There are specific descriptive terms for several typical distributions, such as symmetric, bell-shaped, skewed, etc. In exploratory data analysis, this is helpful. Probability is a tool for predicting data trends.How do you define "identifying patterns in data"?
A group of facts that repeatedly occurs in an identifiable fashion is called a pattern. It can be found in the asset's history or the histories of other assets with comparable traits. The analysis of trends frequently includes both price and selling volume.To know more about data patterns, checkout this link:
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When we see light from a neon sign, we are observing radiation from excited neon atoms. If this radiation has a wavelength of (5.40x10^2) nm, what is the energy of the photon being emitted? Remember to use the correct number of significant figures, put your answer in scientific notation, and include the letter for the units. (Planck's constant h = 6.626 *10-34 Js and speed of light c = 2.998 x108 m/s) Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: Å X10 Answer units
4.78 × 10^-19 J.
To find the energy of the emitted photon, we can use the formula E = hc÷λ. where E is the energy, h is the Planck constant, c is the speed of light, and λ is the wavelength of the radiation. Plugging in the given values gives:
E = (6.626 × 10^-34 Js)(2.998 × 10^8 m/s)/(5.40 × 10^2 nm)
= 4.78 × 10^-19 J
So the energy of the photon being emitted is 4.78 × 10^-19 J.
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Consider the reaction below P4(g) + 6 Cl2(g) → 4 PCl3(g) If 0.351 moles of P4 is mixed with 1.17 moles of Cl2 in a 1.12-L rigid reaction vessel, what is the final pressure in the vessel after the reaction goes to completion? The final temperature is 299. °C. Assume 100% yield.
The pressure of the gas is now obtained as 32.7 atm.
What is the final pressure?We know that the reaction has been shown in the question and we have been asked to be able to obtain the final pressure of the system. We need to obtain the limiting reactant so that we can be able to get the amount of the product that is formed.
If 1 mole of phosphorus reacts with 6 moles of chlorine
0.351 moles of phosphorus reacts with 0.351 moles * 6 moles/1 mole
= 2.1 moles
Thus chlorine is the limiting reactant.
6 moles of chlorine produces 4 moles of phosphorus trichloride
1.17 moles of chlorine produces 1.17 moles * 4 moles/6 moles
= 0.78 moles
We would now apply the ideal gas equation;
PV = nRT
P = pressure
V = volume
n = Number of moles
R = gas constant
T = temperature
Then
P = nRT/V
P = 0.78 * 0.082 * 572/1.12
P = 32.7 atm
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A natural resource found in nature that humans use my be
A natural resource found in nature that humans use may be coal, which is a non-renewable fossil fuel obtained from the earth's crust.
What is a natural resource?A natural resource can be defined as any material and or energy obtained from the environment and available to be used to achieve a particular objective.
Natural resource bay be finite such as occurs with fossil fuels (i.e., coal, sedimentary rocks from the earth's crust, natural gases, etc) or also they can be obtained in reversible ways and therefore in an infinite amount (e.g. the energy from the sun or the eolic energy, which are renewable sources of energy)
Therefore, with this data, we can see that a natural resource is any type of piece of matter or also different types of energies that can be renewables and not renewables such as occur with eolic energy and coal, respectively.
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In which of the following sets are the charges given correctly for all the ions? a.Na+, Mg+, Al + b.K+, Sr, 0²- C.Rb-, Ba2-, p 3+ d.N-, 0²-, F³-
One way to measure temperature in some applications is to monitor
the gas pressure in a rigid, closed container. What is the final
temperature (in °C) of such a vessel, calibrated to initially read 1.00
atm at 0.00 °C, if the pressure changes to 1.25 atm?
Answer:
To determine the final temperature (in °C) of a vessel that is calibrated to initially read 1.00 atm at 0.00 °C if the pressure changes to 1.25 atm, we can use the ideal gas law equation:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature.
Since the volume, number of moles of gas, and the ideal gas constant are all held constant in this problem, we can rearrange the equation to solve for T:
T = (PV)/(nR)
Substituting the given values into the equation, we get:
T = (1.25 atm * V)/(nR)
= (1.25 atm * V)/(1R)
Since the initial pressure and temperature of the vessel are 1.00 atm and 0.00 °C, respectively, we can use the ideal gas law equation to solve for the initial volume of the vessel:
V = (nRT)/P
= (1 * R * 0.00 °C)/(1.00 atm)
= 0
Since the volume of the vessel is 0, the final temperature of the vessel cannot be determined using the ideal gas law equation.
Therefore, it is not possible to determine the final temperature of the vessel in this situation.
The images shown illustrate the effect of pouring liquid N2 over a balloon. Which statements correctly describe the changes observed in image (b) compared to image (a)? Select all that apply.
The addition of liquid N2 decreases T.
The number of moles of air in the balloon remains constant.
The volume of air in the balloon decreases.
Due to the gas within cooling off due to the low temperature, the balloon's volume shrinks.Because helium is lighter than the same volume of air at room temperature, the helium balloon rises.
What happens to a balloon's volume when the pressure rises and what kind of relationship exists between pressure and volume?Boyle's Law: The Relationship Between Pressure and VolumeThe volume of a gas reduces as pressure increases because the gas particles are pushed closer together. The ability of a gas to spread its particles farther apart causes its volume to increase as pressure decreases, in contrast.
Why does liquid nitrogen cause a balloon to shrink?The air within the balloon contracts because liquid nitrogen, which is -196 degrees Celsius, cools so quickly.
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a radical is a reactive intermediate with a single ___ electron, formed by ____ of a covalent bond.
A radical is a reactive intermediate with a single unpaired electron, formed by homolysis of a covalent bond.
Most organic transformations involve the movement of electron pairs (heterolytic reactions). There are a few important addition reactions, however, in which the electron reconfiguration involves the movement of singleelectrons.
Whereas heterolytic bond cleavage leads to ion pairs, homolytic bond cleavage results in unpaired electrons – or free radicals.
Some weak bonds have a tendency to fragment homolytically (e.g., peroxides, halogens). Chemists use a slight variation of curved arrow notation to show the movement of single electrons. For single electron movement, “fishhook” arrows, i.e., single headed arrows are drawn.
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When heated, KClO3 decomposes into KCl and O2.
2KClO3⟶2KCl+3O2
If this reaction produced 94.7 g KCl, how many grams of O2 were produced?
The mass of the oxygen gas produced If this reaction produced 94.7 g KCl is equal to 61 g.
What is the balanced chemical equation?A balanced chemical equation represents the number of atoms of every type of element that is same on the either side of the reaction. The law of conservation of mass is obeyed by every balanced chemical equation.
The total mass on the reactant side is equal to the total mass on the product side in a balanced chemical equation according to this law.
Given a balanced chemical equation of the decomposition of KClO₃:
[tex]2KClO_3 \longrightarrow 2KCl +3O_2[/tex]
The mass of KCl produced = 94.7 g
The number of moles of KCl = 94.7/74.5 = 1.27 mol
Therefore, 1.27 moles of KClO₃ will be decomposed.
2 moles of KClO₃ produces oxygen gas = 3 mol
Then 1.27 mol of KClO₃ will produce oxygen = (3/2) ×1.27 = 1.91 mol
The mass of oxygen gas produced = 1.91 ×32 = 61 g
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What a mass from phenylaamine s produced from 378g of aspartame?
The molar mass of phenyl alanine is 165 g/mol and the mas of the phenyl alanine is 211.2 g /mol
What is the mass of the phenylamine?We know that the statement in the question has told that from the reaction equation. It is one mole of the aspartame that is required to be able to obtain one mole of the phenylamine.
Now we know that the number of moles of the aspartame that is required can be obtained by the use of;
Number of moles = mass/molar mass
= 378g/294.3 g/mol
= 1.28 moles
Molar mass of phenylalanine = 9(12) + 11(1) + 14 + 2(16)
=108 + 11 + 14 + 32
= 165 g/mol
Hence mass of the phenylamine = 1.28 moles * 165 g/mol
= 211.2g
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Consider the following chemical equilibrium: N2(g)+3H2(g) -><- 2NH(g) Now write an equation below that shows how to calculate Kp from Kc for this reaction at an absolute temperature T. You can assume T is comfortably above room temperature. If you include any common physical constants in your equation be sure you use their standard symbols, found in the ALEKS Calculator.
[tex]K_{p} =\frac{K_{c} }{[RT]^{2} }[/tex]
The equilibrium constants for a perfect gaseous mixture are[tex]K_{p} \:and\:K_{c}[/tex]When equilibrium concentrations are stated in atmospheric pressure, the equilibrium constant is [tex]K_{p}[/tex], and when they are expressed in molarity, the equilibrium constant is [tex]K_{c}[/tex]
[tex]N_{2}(g)\rightarrow+3H_{2} (g)\Longleftrightarrow2NH_{3}(g)[/tex]
we need to find the relation between [tex]K_{p} \:and\:K_{c}[/tex] for this balanced equation:
[tex]K_{p} =\frac{[P_{NH_{3} }]^2}{[P_{N_{2} }][P_{H_{2} }]^3}\:\rightarrow(1)[/tex]
where[tex]P_{x}[/tex] means partial pressure of gas [tex]x[/tex].
By ideal gas equation
[tex]PV=NRT\\P=\frac{N}{V} RT[/tex]
And [tex]\frac{N}{V}=\frac{moles}{volume} \\[/tex] denotes concentration
[tex]P=[C]RT \rightarrow[/tex] where C means the (1)
[tex]K_{p} =\frac{[NH_{3}] ^{2}.[RT]^{2} }{[N_{2} ] ^{2}.[RT]^{}\times[H_{2} ]^{3} [RT ]^{3} }[/tex]
[tex]K_{p} =\frac{[NH_{3}] ^{2}. }{[N_{2} ] ^{}.[^{}\[H_{2} ]^{3} } \:[/tex][tex]\times\frac{1}{RT} \rightarrow(2)[/tex]
we know for the reaction equilibrium constant in terms of concentration-
[tex]K_{p} =\frac{[NH_{3}] ^{2}. }{[N_{2} ] ^{}.[^{}\[H_{2} ]^{3} } \:[/tex]
Replacing this in equation no (2),
[tex]K_{p} =\frac{K_{c} }{[RT]^{2} }[/tex]
[tex]K_{p} ={K_{c} }{[RT]^{\triangle n} }\\\triangle n=(moles\:of \:gaseous\: products)-(moles \:of \:gaseous\:reactant)[/tex]
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The two chemicals that were in the 2nd unknown solution where...
Potassium Chloride
Barium Chloride
Calcium Chloride
Lithium Chloride
Sodium Chloride
Copper Chloride
Strontium Chloride
Avoid contact with eyes, skin, and mucous membranes as both copper (II) chloride and barium chloride are extremely poisonous when consumed.
What does utilising cobalt glass for identifying sodium and potassium achieve?The potassium ion (K+) emits light in two different colours. By removing the main colour as the potassium burns, you can see the "underlying" hue by using the cobalt glass.
What warnings apply to cucl2 and LICL?Avoid contact with eyes, skin, and mucous membranes as copper(II) chloride is mildly poisonous. Body tissue is sensitive to lithium chloride. Before throwing the wooden splints in the trash, rinse them to prevent trashcan fires. Put on chemical splash goggles, gloves, and an apron to protect your skin.
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For the molecule SeCl2, determine its Lewis structure, bonding pairs/lone pairs, electron geometry, its shape, and whether or not the molecule is polar.
There are sixteen lone pairs in the molecule and two bond pairs in the molecule. The compound has a tetrahedral electron geometry but the shape is bent. The compound is polar.
What is the Lewis structure?The compound that is under consideration is selenium dichloride. In this compound, we have one atom of selenium and then two atoms of chlorine. The accurate and correct Lewis structure of the compound have been shown in the image that is attached to this answer.
In that structure, we can see the number of valence electrons that can be found in the compound and some of the electrons are lone pairs while the other valence electrons can be seen to be bond pairs.
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A) A 205 ml sample of ocean water contains 6.8g of NaCl. What is the molarity of the solution with respect to NaCl?B) How much of a 12.0 M HNO3 solution should you use to make 850.0 ml of a 0.250M HNO3 soution?C) How much of a 5.0 M sucrose solution should you use to make 85.0 ml of a 0.040 M solution?
By dividing the specified mass by the molar mass of NaCl N a C l, which is: =58.44 g/mol, we may accomplish this.
Molecules per liter, or mol/L, are used to measure molarity. A 0.30 M NaCl solution has 0.30 mol of sodium chloride per liter of fluid. Making solutions is a common task for chemists, thus performing the calculations required to create a specific volume of solution is instinctive. Sodium chloride has a molar mass of 58.5 grams. 0.085 moles of sodium chloride make up one mole. The solution is thought to have a volume of 100mL, or 0.1L. Hence, the 5% saline molarity. Therefore, we must ascertain the NaCl N a C l's equivalent number of moles in order to obtain the molarity.
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a student know the 2.5 moles of iron. he also knows avagaRDO NUMBER? WHAT MUSTE HE DO TO THESE TWO MUMBERS TO FIND NUMBER OF IRON ATOMS IN THE SAMPLE? A. MULTIPLY THEM, B. ADD THEM, C. DIVIDE THEM D. SUBTRACT THEM
He must do to these two numbers to find number of iron atoms in the sample by multiplying them.
Using Avogadro's number, what is the number of molecules?Avogadro's number can be multiplied or divided to convert between molecules and moles: Adding 6.02 x 10²³ o the number of moles will convert it to molecules. Divide the number of molecules by 6.02 x 10²³ to get the equivalent number of moles.
One of the basic constants in chemistry is the Avogadro's number. When the same number of atoms or molecules are being compared, it allows comparison of the various atoms or molecules of the given substances.
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A sample of seawater has a chloride concentration of 1.94%(m/v).What is the chloride concentration of this seawater in ppm?
The concentration of chloride ion in the sample of seawater in ppm is 1940 ppm.
What is the concentration of a substance in ppm?The concentration of a substance in ppm means concentration in parts per million.
Concentration in parts per million, ppm, is equivalent to a concentration of mg/L.
The concentration of chloride ion in the sample of seawater = 1.94 %
A percentage w/v concentration of 1.94 % = 1.94 g/L of solution.
To convert this concentration in grams per liter to mg per liter, we do the following:
1 g = 1000 mg
Hence, 1.94 g = 1940 mg
Hence, the concentration in parts per million = 1940 mg/L or ppm.
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behavioral and physiological changes in daphnia magna when exposed to nanoparticle suspensions (titanium dioxide, nano-c60, and c60hxc70hx)
Filter feeders include daphnia.The setose thoracic legs function as sieves to remove detritus, germs, and algae from the water.Before food enters the gut for digestion, daphnia transfer this to the mouth and grind it with their mandibles.Food retention lasts for between one and three hours.
What are some typical factors that affect Daphnia's heart rate?It is well known that high temperatures or anoxic conditions, which result in low oxygen levels, increase the heart rate of daphnia(34) (9).
Why does a Daphnia's heart beat rise when the temperature rises?The rate of physiological processes and chemical reactions inside the organism accelerates as body temperature rises.The rate of cellular respiration accelerates, increasing the need for oxygen and the output of carbon dioxide.This calls for the heart, which pumps blood, to beat more quickly.
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check all that are valid exceptions to the octet rule. question 14 options: some elements get an incomplete octet (like be and b) some elements can have an expanded octet, but the element must be in the third period or below. hydrogen wants just 2 electrons, it should never have 8 carbon can have up to 12 electrons if needed
All listed options are valid exceptions to the octet rule.
Some elements, such as boron (B) and beryllium (Be), may have incomplete octets.
Some elements, such as aluminum (Al) and chlorine (Cl), can have extended octets if they are in the third period or below in the periodic table.
Hydrogen (H) usually don't follow the octet rule because they usually only want to have two valence electrons.
Carbon (C) can have up to 12 valence electrons under certain circumstances. For instance, When forming aromatic compounds or forming covalent bonds with other elements with high electron demand.
Overall, the octet convention is a general guideline and not strictly followed by all elements. There are many exceptions to this rule, and some elements may deviate from the octet rule to achieve more stable electronic configurations.
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Which is not a component of nucleic acids?A. organic nitrogenous baseB. pentose sugarC. phosphateD. sulfur
Option D is correct. DNA contains the bases adenine (A), cytosine (C), guanine (G), and thymine (T) (T). These bases come in particular pairs (A with T, and G with C).
Deoxyribose sugar, a phospate molecule, and one nitrogenous base from adenine, guanine, thymine, and cytosine are all components of the nucleotides that make up DNA strands. Uracil never makes up a DNA nucleotide. A sugar (deoxyribose or ribose), a phosphate, and a nitrogen base make up a nucleotide (uracil, adenine, thymine, guanine, or cytosine). In eukaryotes, histones are utilized to structure DNA; they are not a part of nucleotides. The main form of linkage found in nucleic acids, such as DNA and RNA, is phosphodiesterase linkage. With no phosphodiester connections tying the phosphate to the nearby 3'OH sugar molecule.
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