An annelid can regenerate to some extent after being split in half, and in some species, you may even get two worms. However, the common earthworm only regenerates from the tail end; Every time, the head end dies.
Can worms withstand being divided in half?The Washington Post reports that many earthworms can lose several segments from their head end and grow back, and that almost all worms can regrow their tails if they are amputated. However, for some worms, the likelihood of fully regenerating decreases with the number of segments removed.
What substance does the earthworm secrete to stabilize the tunnel walls?Coelomic fluid, which is secreted by many earthworms, makes it easier for them to move through the soil. This fluid forms a cement-like substance that lines the burrows of some burrowing species to prevent the walls from falling down.
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N2(g) + 3 H2(g) + 2 NH3(g)
What is the mole-to-mole ratio between nitrogen gas and hydrogen gas?
Answer:
Notice that you have a 1:3. mole ratio between nitrogen gas and hydrogen gas. This means that, regardless of how many moles of nitrogen gas you have, the reaction will always consume twice as many moles of hydrogen gas.
Explanation:
Question 4
3 pts
Which if the following elements will not reach an octet when in a bond?
Calcium
O Lithium
Magnesium
O Carbon
Ouestion 5
Lithium has a valence of 1, so it will not usually reach an octet in a bond. It tends to form ionic bonds, in which there is only one electron transfer, rather than two or more which would be required to reach an octet.
What is Lithium?Lithium is a soft, silver-white metal that is the lightest of all alkali metals. It is a key component in many batteries, and is also used in a variety of other applications. It has a low reactivity, and is relatively stable when exposed to air and water. In its elemental form, Lithium is a highly flammable, corrosive metal that is rarely found in its pure form in nature. It can be found in minerals such as lepidolite and spodumene, and is commonly mined from salt flats and brine pools.
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Place the following in order of increasing radius.
Br- Na+ Rb+
The order of increasing radius is: Na+ < Rb+ < Br-
The radius of an atom or ion is a measure of the size of the atomic nucleus and the electron cloud that surrounds it. The radius of an atom or ion can be affected by various factors such as the number of protons, neutrons and electrons it has, as well as the electron configuration. In general, as we move from left to right across the periodic table, atomic radius tends to increase.
In the case of the three ions you provided, Br-, Na+ and Rb+ , the order of increasing radius is as follows:
Na+ has the smallest atomic radius among the three, as it has lost one electron and become a positive ion, the removal of the electron increases the effective nuclear charge, making the electron cloud more tightly held.
Rb+ has a slightly larger atomic radius than Na+ as it has one more electron and one more proton in its nucleus than Na+, making the electron cloud slightly less tightly held.
Br- has the largest atomic radius among the three as it has gained an electron and become a negative ion, the addition of the electron decreases the effective nuclear charge, making the electron cloud less tightly held.
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if a molecule has a phase transition from gas to liquid, does that mean it increases attractive force
When a molecule undergoes phase transition from gas to liquid, it means that there is an increase in the attractive force.
The matter which is present around us exists in three major states which are solids, liquids and gases. The attractive forces that are present between the particles of matter are known as the intermolecular forces and they change with the change or transition in state of matter.
The particles of solids have the highest intermolecular force followed by liquids and then followed by gas. When a particular gas changes into the liquid state, the attractive forces between its particles increases.
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In a lifetime, the average American uses more than a half ton (500 kg) of copper in coins, plumbing, and wiring. Copper is obtained from sulfide ores, such as chalcocite [copper(I) sulfide] by a multistep process. After initial grinding, the ore is "roasted" (heated strongly with oxygen gas) to form powdered copper(I) oxide and gaseous sulfur dioxide. How many moles of oxygen are required to roast 10. 0 mol of copper(I) sulfide?
The required moles of oxygen is 10.0 mol of [tex]O_2[/tex] (Oxygen) is required to roast 10.0 mol of CuS (copper(I) sulfide).
Because the Sulphur absorbs the impurities as fumes and reacts with the remaining ore to produce Copper metal by auto-reduction, the ore is partially roasted.
[tex]Cu_2S.Fe_2S_3+O_2→Cu_2S+2FeS+SO_2[/tex]
[tex]Cu_2S+3O_2→Cu_2O+2SO_2[/tex]
Sulfide ore is heated by a heat source in the presence of air during the roasting process. The ore or ore concentrate is treated with very well-liked air during roasting. This method is frequently used when processing sulfide ores. The sulfide that is present during roasting is changed into oxide and emitted as sulfur dioxide, a gas.
Roasting's primary purposes are to eliminate volatile impurities and oxidize the ore by turning it into oxide.
A significant copper resource is COPPER-PYRITES, often known as chalcopyrite, which is a copper iron sulfide (CuFeS2).
To roast 10.0 mol of copper(I) sulfide (CuS), the balanced equation is CuS + O2 → CuO + SO2.
For every mole of CuS that reacts, one mole of O2 is consumed. Therefore, 10.0 mol of [tex]O_2[/tex] is required to roast 10.0 mol of CuS.
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Give the orbital configuration of the following elements using the s, p, d, f type representation. (Answer format is: 1se2
The orbital configuration of following elements is as follows: i) helium- 1 s² ii)nitrogen- 1 s² 2 s² 2 p³ iii)silicon-1 s² 2 s² 2 p⁶ 3 s² 3 p²
What are elements?It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.
Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.
The number of protons in the nucleus is the defining property of an element and is related to the atomic number. All atoms with same atomic number are atoms of same element.
Here,
The orbital configuration of following elements is as follows: i) helium- 1 s² ii)nitrogen- 1 s² 2 s² 2 p³ iii)silicon-1 s² 2 s² 2 p⁶ 3 s² 3 p²
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How does photosynthesis affect CO2 and O2 levels in the environment?
As a result of photosynthesis the level of CO₂ decrease and the the level of o2 increase in the environment.
Photosynthesis is a chemical process that occurs in algae, plants and some types of bacteria, when they are exposed to the sunlight. During photosynthesis, water and carbon dioxide will combine to form carbohydrates and gives off oxygen.
During photosynthesis, plants take carbon dioxide from the air. Within the plant cell carbon dioxide is reduced, meaning it gains electrons. This transforms the carbon dioxide into glucose. The plant then releases the oxygen back into the air, and stores energy within the glucose molecules.
Photosynthesis increases the content of the non-structural carbohydrates in the leaves which can lead to grater starch reserves and increased auxin biosynthesis.
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What is the energy of an electromagnetic wave with a electromagnetic wave with a frequency of 3 * 10 Hz ?
Answer:
[tex]E=1.989*10^{-32}J[/tex]
Explanation:
From the question we are told that:
Frequency [tex]f=3 * 10 Hz[/tex]
Generally the equation for Energy of an electromagnetic wave is mathematically given by
[tex]E=hf[/tex]
Where
h=Planck's constant
[tex]h=6.62607015 * 10^{-34}[/tex]
Therefore
[tex]E=6.62607015 * 10^{-34}*3 * 10[/tex]
[tex]E=1.989*10^{-32}J[/tex]
Human population growth in 2018 was 1. 7%. If this rate of growth remains constant, in what year will the human population double?
Human population growth will Double time and that will be 41.17 years
Human growth can be defined as;
The growth and development are positively influenced by factors, like parental health and genetic composition.
Population growth is the increase in the number of humans on Earth.
Human population has grown exponentially over the past century. It has done so largely by producing large amounts of food, and learning how to control disease.
We can find what year the human population would double using the rule of 70. This is given as;
Double time = 70 / rate(r)
Double time = ?
Rate = 1.7%
Inserting into the equation;
Double time = 70 / 1.7
Double time =41.17 years
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What are true about water changing states?
Answer:
The last one is true.
Atoms of chlorine-37 have a mass number of 37.
Calculate the number of neutrons in atoms of chlorine-37.
Answer:
20
Explanation:
17 proton and 20 neutrons
Answer: #Neutrons= 20
Explanation: Cl with 37 mass number has the atomic number of 17.
Solution:
mass number = Protons + Neutrons
But # Protons = 17
Therefore, N= A-P= 37-17= 20 neutrons
One grizzly bear population has moved to an area that has snow year-round. Which of these statements might you expect to occur if a mutation for coat color is going to spread through the population?
To solve this we must be knowing each and every concept related to mutation and types of mutations. Therefore, the correct option is option C.
What is mutation?A mutation is, at its most basic, a change or alteration. Chromosome and gene alterations, known as mutations in biology, frequently appear physically.
One grizzly bear population has moved to an area that has snow year-round. If a mutation for coat color is going to spread through the population then Grizzly bears that have a lighter fur mutation can catch prey more easily and so have more resources to have more offspring. Due to this, the trait starts to spread through the population.
Therefore, the correct option is option C.
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1) HA + H2O <--> H3O+ + A- ....what is HA considered?
O
Acid
Base
Conjugate Acid
Conjugate Base
N2+ 3H2= 2NH3+ energy Design criteria are the desired features of a design. Identify at least two criteria for the design of the ammonia-making process. Explain why these criteria are important.
Efficiency and safety are important criteria for the design of ammonia production processes, as they consume less energy and reliably produce large amounts of ammonia with minimal risk of accidents.
What are Design Criteria?Design criteria are specific characteristics or requirements that a design must meet in order to be successful. They provide clear and measurable criteria for evaluating designs, ensuring that the final product meets the needs and expectations of customers or users. Design criteria include not only technical specifications such as size, weight and materials, but also performance requirements such as safety, efficiency and durability. It can also include cost-related criteria such as manufacturing cost, ease of maintenance, and environmental aspects. The process of identifying and defining design criteria is an important step in the design process as it helps ensure that the final product meets user needs and is fit for purpose. This is important because as much of the reactants (nitrogen and hydrogen) as possible are converted to ammonia, thereby maximizing the yield of the process. This is important to make the process economical and produce large amounts of ammonia.
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Gaseous ammonia chemically reacts with oxygen O2 gas to produce nitrogen monoxide gas and water vapor. Calculate the moles of water produced by the reaction of 0.90mol of ammonia. Be sure your answer has a unit symbol, if necessary, and round it to 2 significant digits.
1.08 moles of water () produced by the reaction of 0.90mol of oxygen.
Explanation:
Moles of oxygen given = 0.90 mole
Moles of water are to be calculated.
Step 1 : Write the chemical reaction and balance it.
5 mole of reacts with 4 mole of to give 4 moles of NO and 6 moles of .
Step 2 : Calculate moles of water () utilising mole ratio.
The coefficient of is 6 and coefficient of is 5, So mole ratio of to is 6 : 5
Moles of = 0.90 × 6 (moles of ) ÷ 5 (moles of )
Moles of = 1.08 moles
1.08 moles of is produced by the reaction of 0.90 mole oxygen ()
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Calculate the density mass= 54.2 volume= 78.1
Answer:
0.693 (you can round it up if you want to)
Explanation:
Density= mass ÷ volume
54.2 ÷ 78.1 = 0.693
I hope this helped☺
How the structure of molecule affects physical properties?
The structure of a molecule affects its physical properties because the arrangement of the atoms in the molecule determines the type of forces that interact between molecules.
And that forces affect how the molecules move and interact with each other. This, in turn, affects the physical properties of the molecule, such as its melting point, boiling point, polarity, and solubility.
For example, when a molecule has a higher number of non-polar bonds due to symmetrical structures, it will be less polar overall and have fewer attractive forces acting between molecules, resulting in a higher boiling point and lower solubility.
On the other hand, a molecule with a higher number of polar bonds due to asymmetrical structures will be more polar overall, leading to stronger attractive forces acting between molecules, resulting in a lower boiling point and higher solubility.
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If the pressure of a 2.3 mole sample of gas is initially 1.5 atm, the volume is
1.0 L and the temperature is 25°C, what would the new volume be if moles
are increased to 3.4 and the pressure is changed to 6.0 atm and 100.0°C?
267 L
0.46
0.500 L
300 L
For an arbitrary worm of length L, radius R, and density d, write an equation (using the symbols A and/or B rather than the numbers) that expresses the number of moles of oxygen the worm absorbs per hour and the number of moles the worm uses per hour. How can you tell whether the worm takes in oxygen at a rate fast enough to survive
The number of moles of oxygen a worm absorbs per hour can be calculated using the formula:
A = (LR^2dO2) / (MT)
Where A is the molar flow rate of oxygen, L is the length of the worm, R is the radius of the worm, d is the density of the worm, O2 is the concentration of oxygen in the environment, M is the molar mass of oxygen, and T is the time in hours.
The number of moles of oxygen the worm uses per hour can be calculated using the formula:
B = (k*A)
Where B is the molar flow rate of oxygen used by the worm and k is the rate constant for oxygen consumption.
To determine whether the worm is taking in oxygen at a rate fast enough to survive, we would need to compare the rate of oxygen absorption (A) to the rate of oxygen consumption (B). If A > B, then the worm is absorbing oxygen at a rate that is greater than or equal to the rate at which it is consuming oxygen, and it should be able to survive. If A < B, then the worm is not absorbing oxygen fast enough to sustain its metabolism and it may not survive.
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It is known that the reaction A - B is
second order with a rate constant of
k= 0.1 s-1 a 200°C. If the initial
concentration of A is 0.5 M, what is the
concentration of A after 30 seconds?
Answer:
0.0203M
Explanation:
We'll use the integrated rate law for second order reactions:
1/[A]=1/[A]initial+kt
[A]initial=0.5M
k=0.1/s
t=200°C but we need in Kelvins
t=200 +273.15K=473.15K
1/[A]=1/[0.5]+[0.1 x 473.15]
1/[A]=49.315M
[A]~0.0203M
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Hydrochloric acid (HCl) is a strong acid that completely ionizes in an aqueous solution. If its [H3O+] concentration is 0.023 M, what is its pH
Answer:
pH = 1.64
Explanation:
How many grams of hydrogen gas is produced in Zn + HCl
Answer:
3.08 grams
Explanation:
Answer:3.08 grams
Explanation:
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who discovered atomic structure
What is the molarity of a solution of K3PO4 made by mixing 0.26 mol of potassium
phosphate with water up to 0.35L?
Given :
0.26 mole of [tex]K_3PO_4[/tex] and 0.35 L of water.
To Find :
The molarity of a solution of [tex]K_3PO_4[/tex] made by mixing 0.26 mole of potassium
phosphate with water up to 0.35 L .
Solution :
We know, molarity is given by :
[tex]M = \dfrac{number \ of \ moles }{Volume \ in \ Liter}\\\\M = \dfrac{0.26}{0.35}\ M\\\\M = 0.743 \ M[/tex]
Therefore, the molarity of [tex]K_3PO_4[/tex] solution is 0.743 M.
When water is dissolving the NaCl, the positive (hydrogen) side of the water molecule pulls off the ________________ ___________ ions.
Group of answer choices
A. negative chlorine
B. positive sodium
C. negative sodium
D. positive chlorine
Answer:
A negative chlorine
Explanation:
B and D r wrong coz positive doesn't attract positive.
for C , sodium doesn't have a negative valency.
Which of the following elements will form positive ions Na N Cu Br
Answer:
Na, Cu, and Br will form positive ions
Explanation:
Na, Cu, and Br have more protons than electrons, so they will form positive ions.
Na, Cu, and Br are all elements that have an atomic number greater than their number of electrons. This means that they have more protons than electrons, so they will form positive ions when they react with other elements. Na will form Na+, Cu will form Cu+ and Br will form Br+.
Anyone know this question
Answer:
Second option. 3
Explanation:
In order to balance a equation you need to have the same amount of atoms/moles in both sides.
Na₃PO₄ + _ HCl → 3NaCl + H₃PO₄
In reactant side we have 3 Na and we have the same amount in product side.
We also have 1 P and 4 O in both sides of the equation.
As we have 3 moles of NaCl in product side, this means we have:
NaCl → Na⁺ + Cl⁻
3 moles of Na⁺ and 3 moles of Cl⁻. In conclussion we need 3 moles of Cl⁻ in reactant side.Then, the stoichiometry of HCl must be, 3.
3 moles of HCl means that we have 3 moles of protons (H⁺).
HCl → H⁺ + Cl⁻
If you see the phosphoric acid, we also have 3 moles of protons.
H₃PO₄ → 3H⁺ + PO₄³⁻
Complete balanced equation is:
Na₃PO₄ + 3HCl → 3NaCl + H₃PO₄
HELP NOW PLEASE Which is not a type of RNA in the diagram
mRNA
rRNA
tRNA
zRNA
Answer:
zRNA
Explanation:
RNA is a nucleic acid responsible for the synthesis of proteins, since it is the molecule that carries the information contained in DNA for the biological process called transcription.
There are three types of RNA, the mRNA, the tRNA and the rRNA. There is no RNA called a zRNA, however, existing RNAs have different functions. These functions are listed below:
The mRNA is called messenger RNA and is the RNA responsible for containing the DNA information that will be translated into proteins created during protein synthesis.
The tRNA is responsible for identifying the information presented by the mRNA, creating amino acids from it and transporting those amino acids in the right order to form proteins.
rRNA is also called ribosomal RNA and is responsible for creating ribosomes, which are the organelles where protein synthesis will take place.
what is purpose of fine sand filter in purification of water
The reaction of solid sodium metal with gaseous diatomic chlorine produces common table salt and lots of heat. The chemical equation for this reaction is best written as
The chemical equation for this reaction is best written as: Na (s) + Cl2 (g) → NaCl (s) + Heat
What is reaction?Reaction is a process in which one or more substances are changed into one or more different substances. It is a chemical or physical change that occurs in response to a stimulus. Reactions can be used to create new materials or to break down existing materials into simpler components. They can also be used to generate energy or to store energy. Reactions can be either spontaneous or non-spontaneous, depending on the conditions in which they occur.
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