Na₃PO₄ will dissociate into the largest number of ions in solution.
A dissociation reaction is defined as a reaction where larger molecules dissociates to form new molecules by the use of some energy. The required energy is found in the form of heat or electricity after the reaction. Dissociation reaction is reversible in nature, where a single reactant will break down to form two or more products and vice versa.
The formula for a dissociation reaction is follows as: AB → A + B.
When Na₃PO₄ is dissolved in water, it is broken down into its constituent ions. Constituent ions of Na₃PO₄ are sodium ions and phosphate ions.
Conclusively, The chemical equation for showing the change is given as:
Na₃PO₄(s) → 3Na+(aq) + PO₃⁻⁴(aq)
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a compound is found to have an empirical formula of ch2o. what is the molecular formula when the molecular weight is 180.0 grams?
The empirical formula of the compound is CH₂O and when the molecular weight of this compound is 180 g, its molecular formula is C₆H₁₂O₆.
The molecular weight of the compound according to its empirical formula is given as,
12 + 2 + 16 = 30 g
It is given that molecular weight of the compound is 180 g, so the ratio is,
180/30 = 6
Therefore, we can obtain the molecular formula by multiplying to each element in the empirical formula.
C₆H₁₂O₆.
Hence, the empirical formula of the compound is CH₂O and when the molecular weight of this compound is 180 g, its molecular formula is C₆H₁₂O₆.
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(b) calculate the number of moles of cuso4 that were in the impure sample of cuso4(s).
This question is incomplete
In order to calculate the number of moles of CuSO4 in the impure solution, we need to have the mass of copper sulphate in that impure solution. Only then, we can divide the mass of copper sulphate with its molar mass to get the number of moles of CuSO4 in the solution.
Therefore, the formula to calculate the number of moles of CuSO4 in the solution is
Number of moles = Mass of copper sulphate/ molar mass of copper sulphate
Alternate methodIf you are given the molarity of a particular volume of the solution. You can apply following formula
Molarity = moles / volume of solution
Or
Moles = molarity x volume of solution
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predicting outcomes a mixture contains cobalt metal, copper metal, and tin metal. this mixture is mixed with nickel nitrate. which metals, if any, will react? write the chemical equation for any reaction.
The metal that will react is Cobalt.
The equation for the reaction is,
Co + Ni(NO3)2 → Co(NO3)2 + Ni
The above reaction is an example of Displacement Reaction. Displacement reaction is a chemical reaction in which a more reactive element displaces a less reactive element from its compound.
Cobalt is more reactive than Nickle in the reactivity series so it displaces Nickle from Nickle Nitrate and forms Cobalt Nitrate.
Reactivity series is a list of metals arranged in decreasing order of their reactivity. The metals with the greatest reactivity are at the top, followed by those with the lowest reactivity. Higher-ranking metals in a series can force lower-ranking metals out of their salt solution for any two metals in the series.
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Which has highest reduction potential Zn or Cu?
Copper (0.34 V) has higher tendency to get reduced than potential Zn −0.76 V.
Zinc has an electrode potential of -0.76 V, whereas copper has a potential of +0.34 V.
With both electrodes acting anodically in relation to their respective local electrolytes, the voltmeter measures the sum of these two voltages, or 1.10 V, in an open circuit. Two electrodes are connected in a closed circuit, which allows current to flow. Copper functions as the galvanic cell's cathode, while zinc acts as its anode, supplying electrons (consuming electrons).
Copper electrode takes up copper atoms from the electrolyte as the zinc electrode dissolves (corrodes or oxidises) (electroplating or reduction). This procedure keeps going as long as the circuit is closed.
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What is the primary cause of the overall rising trend in CO2 in the atmosphere?
A. CO2 is increasing because we are coming out of an ice age
B.As human population grows, people exhale more CO2
C. CO2 is released by the oceans as they warm
D.The increase in CO2 is caused by burning of fossil fuels
Answer:
D.The increases in CO2 is caused by burning of fossil fuels
Explanation:
CO2 increases happens because the coal or oil burning process combines carbon with oxygen in the air to make CO2.
so the answer is D. The increase in CO2 is caused by burning of fossil fuels
How formaldehyde is formed?
In addition to other natural and human-made processes, the burning of organic materials is the main source of formaldehyde formation.
The simplest of the aldehydes, formaldehyde (HCHO), commonly known as methanal, is an organic molecule utilized in huge quantities during numerous chemical industrial processes. It is often supplied as formalin, an aqueous solution with a 37 percent concentration, and is primarily manufactured via the vapor-phase oxidation of methanol.
Industrial production of formaldehyde involves the catalytic oxidation of methanol. The most often used catalysts are iron(III) oxide, iron molybdenum oxides, and silver metal [e.g. Vanadium oxides or iron(III) molybdate with a molybdenum-enriched surface. Methanol and oxygen react at around in the commonly used formox process.
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an aqueous solution containing 15.0 g of naoh is mixed with an aqueous solution containing 15.0 g of h2so4. is sodium hydroxide or sulfuric acid the limiting reactant?
A mixture of an aqueous solution containing 15.0 g of NaOH and 15.0 g of h2so4 is performed. The limiting reactant is sulfuric acid.
Na2SO4(aq) + 2H2O = H2SO4(aq) + 2NaOH(aq) (l)
sodium hydroxide molecular weight is 40 g.
sulfuric acid's molar mass is 98 g per mole.
Calculate the number of moles necessary to equal the given molar mass.
15g/40 = 0.375 moles of sodium hydroxide make up the whole amount.
Sulfuric acid has a molecular weight of 15/98, or 0.153 moles.
We can say that sulfuric acid is the limiting reactant because its moles are low.
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in a chemical reaction, lithium metal is placed in water, and lithium hydroxide is produced, along with hydrogen gas. what are the products?
Sodium hydroxide and hydrogen gas are products.
2Li (s) + 2 H2O (l) → 2 LiOH (aq) + H2 (g)
What is Chemical Reaction?
In a chemical reaction, bonds between molecules of the reactant are broken and new bonds between molecules of the product are established to create a new substance.
Chemical reactions occur all around us, including in our body's digestion of food and the creation of the sunlight's light. Understanding physical and chemical changes is crucial before starting any chemical processes.
The following balanced chemical equation depicts how lithium metal reacts with water to produce lithium hydroxide and hydrogen gas
LiOH (aq) + H2 = 2Li (s) + 2H2O (l)
0.30 mol of H2 gas is separated in the lab when Li is combined with extra water.
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radioactive isotope technetium-99m has a half-life of 6 hours. what fraction of a sample of technetium-99m remains after 24 hours? group of answer choices
After 24 hours, only 1/8 (or 12.5%) of the original sample of technetium-99m remains.
What is half life?
Half-life is the amount of time required for a substance, such as a drug or radioactive material, to reduce to half its initial amount. The term is commonly used in the fields of nuclear physics and radiochemistry, where it describes the time required for a nucleus to reach half its original activity. In pharmacology, it is the time it takes for a drug to reduce its dose by half in the bloodstream. In general, the half-life of a substance is the amount of time it takes for the amount of the substance to decrease by half.
This is because the half-life of technetium-99m is 6 hours. This means that after 6 hours, half of the original sample has decayed, leaving only half of the original sample. Then after another 6 hours, half of that remaining sample decays, leaving 1/4 of the original sample. After another 6 hours, half of the remaining sample decays, leaving 1/8 of the original sample. Thus, after 24 hours, only 1/8 of the original sample of technetium-99m remains.
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which lewis electron-dot diagram represents the bonding in potassium iodide
The lewis electron-dot diagram which represents the bonding in potassium iodide, KI is give in image attached.
The correct answer choice is option 1.
What is meant by lewis electron-dot diagram?The lewis structure can simply be defined as those diagrammatic chemical representations which describes the bonding between atoms in a particular molecular structure of a chemical substance. From the context of the above given task, the structure is bonded by eight different electrons.
The importance of lewis electron-dot structures cannot be overemphasized. Some of its significances are as follows:
It helps to us understand how chemical substances are bonded or how they bond.It also shows how electrons are arranged It gives us an indepth knowledge of arrangement of valence electrons of a molecule.In conclusion, we can now confirm from the explanation given above that potassium iodide is solid chemical compound.
The complete image of the options of the question is also attached.
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Which of the following is a correct chemical equation for the incomplete combustion of C2H6?
A: C2H6 + 2O2 --> 2CO2 + 3H2
B: 2C2H6 + 7O2 --> 4CO2 + 6H2O
C: 2C2H6 + 5O2 --> 4CO + 6H2O
D: C2H6 --> 2C + 3H2
Considering the definition of incomplete combustion, the correct answer is option C: the correct chemical equation for the incomplete combustion of C₂H₆ is:
2 C₂H₆ + 5 O₂ → 4 CO + 6 H₂O
Definition of combustionCombustion is a chemical process through which heat is obtained. To achieve this, oxidation reactions are generated that allow the objective to be reached. To carry out the process, it is necessary to have several elements:
the fuel, which is the substance that is oxidized, can be in a solid, liquid or gaseous state and is made up mostly of carbon and hydrogen.the oxidizer, which is the substance that oxidizes the fuel, and is generally the oxygen found in the air.the activation energy, which is responsible for triggering the reaction.Incomplete combustionIncomplete combustions are those reactions in which compounds that have not been completely oxidized (also called unburned) appear in the combustion gases. Carbon monoxide (CO), a highly toxic gas, and unburned carbon (soot) are usually formed.
Correct chemical equationIn this case, considering the definition of incomplete combustion, the correct chemical equation for the incomplete combustion of C₂H₆ is:
2 C₂H₆ + 5 O₂ → 4 CO + 6 H₂O
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how does the rate of decay of a long-half-life material normally compare to the rate of decay of a short-half-life material?
The rate of decay of a long half-life material is less than the rate of decay of a short half-life material.
Definition of Half-life
The half-life of a radioactive isotope is the total amount of time taken for one-half of the radioactive isotope to decay. Half-life of a material (symbol t½) is the time required for a quantity of material to reduce to half of its initial value.
The longer half life of the material is more stable than the short half life of that material.
Hence, the rate of decay of a long half-life material is comparatively less to the rate of decay of a short half-life material.
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which statements about the overall polarity of organic molecules are correct? select all that apply. multiple select question. if identical polar bonds in a molecule are symmetrically arranged, it will be nonpolar. all tetrahedral molecules are nonpolar, since the bonds are symmetrically arranged. if a molecule contains polar bonds, then it will be a polar molecule. a molecule with a single polar bond will be polar overall.
The statement that is correct is if a molecule contains polar bonds, then it will be a polar molecule. a molecule with a single polar bond will be polar overall.
Bond among or extra atoms is polar if the atoms have notably exceptional electronegativities (>0.4). Polar bonds do now no longer percentage electrons equally, that means the bad rate from the electrons isn't always calmly dispensed withinside the molecule.
This reasons a dipole moment.Polar MoleculesIn a molecule having a polar bond, the centre of the bad rate can be on one side. Whereas the centre of superb rate can be at the exceptional side. The whole molecule can be a polar molecule.
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What are the 3 types of bonds How do they differ between one another?
A chemical bond can be formed by exchange of electrons, sharing of electrons.
There are majorly three types of chemical bonds.
These are:
Ionic Bond,
Covalent Bond,
and Metallic Bonds.
Ionic Bond: When an atom lose or gain the electron to attain the stability it forms ions and the attractive forces between two oppositely charged ions is known as ionic attractions or electrostatic attractive forces.
and such formed bonds are known as ionic bonds.
An ionic bond is formed when the difference between the electronegativities of two atoms is high as an electron transfer to occur to form the ions.
Covalent Bond: A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms.
A covalent bond is formed when the electronegativity difference of two atoms is too small for an electron transfer to occur to form ions.
Metallic Bonds: Metallic bonds are made up of electrostatic attraction between metal cations and the delocalized electrons. Metallic bond is collective sharing of valence electrons between several positively charged metal ions.
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In calorimetry experiments we are able to determine the amount of heat exchanged in a chemical reaction or process by measuring the amount of heat lost or gained in the surroundings.
a. True
b. False
The given statement is True.
A calorimeter is a tool used in the calorimetry process. Calorimetry is a method for measuring a physical or chemical reaction's heat capacity as well as its heat changes. Therefore, the measurement of heat gained or lost by a system and its surroundings uses a calorimeter
Where is calorimetry employed?
Calorimetry is a popular tool for measuring chemical reactions and biological ones. The primary benefit of calorimetry is that it does not require expensive equipment and can monitor minute changes in energy.
What is a practical illustration of calorimetry?
Calorimeters are useful in a variety of fields, including academia. An industrial pilot plant can use a DSC to assess the impact of a change to a product's formula. In food testing labs, oxygen bomb calorimeters are useful for calculating the quantity of heat (calories) in food.
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three students are asked to discuss the sources of error that might have affected the outcome of the lab. which student employs correct scientific reasoning?
Systematic error, random error, and human error are the three main types of mistake in physical and chemical laboratory research. Prior to taking any further action, these lab error sources should be thoroughly investigated.
Assuming you are using a stopwatch to determine the amount of time required for 10 pendulum oscillations, an example of how to tell systemic from random errors is to assume that you are. Your response time can be a factor when starting and stopping the watch. During one measurement, you might begin early and end late; on the following one, those inaccuracies can be corrected. Since all situations have an equal likelihood, these mistakes are unintentional. Repeated tests result in a series of slightly varying times. They fluctuate randomly around an average value.
If there is a systemic error, for instance, your stop watch won't start at zero, then the calculations will be different regarding the displaced value rather than the average value.
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if sodium perchlorate has the formula, naclo4, what formula would you expect for cesium perchlorate?
the compound magnesium sulfide is a strong electrolyte. write the reaction when solid magnesium sulfite is put into water
When solid magnesium sulfate MgSO₄ is poured into water, then the dissolution of MgSO₄ occurs. MgSO₄ is a strong electrolyte. Hence, the reaction is MgSO₄ + H₂O ⇒ Mg²⁺ + SO₄²⁻ + H⁺ + OH⁻.
What is magnesium sulfate ?Magnesium sulfate, also known as magnesium sulphate, is a salt with the chemical formula MgSO4 that is made up of the cations magnesium and sulfate. It is a crystalline white substance that dissolves in water but not ethanol.
Epsom salt can be dissolved in water to create hard water. Hard water is the outcome of the separation of magnesium ions (Mg2+) and sulfate ions (SO4-2) during the dissolution of Epsom salt (magnesium sulfate).
Thus, When solid magnesium sulfate MgSO₄ is poured into water, then the dissolution of MgSO₄ occurs.
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chemical bonding allows each atom involved in the bond to fill its ______________.
chemical bonding allows each atom involved in the bond to fill its outer shell.
Chemical Bonds
Atomic or elemental bonds depend on the energy level in which the outermost electron e- or e- resides.
The first shell, the innermost level, can hold up to two electrons.
The second can hold up to 8 electrons.
The third can hold up to 8 electrons.
An atom
is stable or non-reactive if the outermost energy level (shell) holds the maximum number of electrons. It does not bond with other atoms. Does not form chemical bonds,
or compounds.
To become stable, atoms gain, lose, or share electrons to complete their outermost energy levels (electron shells).
octet rule because levels 2 and 3 need 8 electrons to be stable.
Look at the outermost electron shells (energy levels).
VALENCE
The number of electrons in the outer energy plane (shell) determines (tells) the valence of the atom.
Having 8 electrons in the outermost shell (the octet rule) determines the valence of the atom (it's a number).
Note: The "group number" in the periodic table indicates the number of electrons in the outermost shell. From this we can read how many electrons the atom must lose or gain to reach 8.
The valence is the number of electrons an atom loses or gains in order to have a perfect outer shell (it is always the minimum number).
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a mixture of two gases with a total pressure of 5.00 atm contains 0.30 atm of gas a. what is the partial pressure of gas b?
The partial pressure of gas B is 4.7atm.
Total pressure of both gasses= 5atm
Partial pressure of gas A= 0.3atm
Hence, partial pressure of gas B:
= Total pressure - Partial pressure of gas A
=5 - 0.3
= 4.7 atm
What is pressure?
Since the stress is dependent on the region over which the force is acting, the pressure may be multiplied and reduced with none change within the pressure. The pressure is implemented to be steady if the surface becomes smaller the pressure increases and vice versa.for example, a brick sitting on a surface exerts a force equal to its weight on the object it is resting on. Now we know that a square brick has a wide surface and a skinny surface on the edges. through converting the orientation of the brick resting on a floor, we are effectively converting the stress acting at the floor via the identical brick.To know more about pressure, click the link given below:
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For every molecule of O2 that is released by photosystem II, _________ H2O molecules are needed, which together pass _________ electrons to the PS II reaction-center complex.
As a result, four electrons are given to the PS II reaction-center complex for every molecule of O2 produced by PS II, and two molecules of water are required in its place.
For photosystem II, what is required?One of the protein complexes is the photosynthesis component known as Photosystem II. Numerous research have centered on it as a significant biological energy source for life on earth. For the entire photosynthesis to take place, this process needs water to obtain the electrons.
What chemical supplies photosystem 2 with electrons?The initial step in the photosynthesis process is photosystem II. By catching photons, it can use the energy to pull electrons out of water molecules.
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A solute is dissolved in a liquid. how does the osmotic pressure of the solution compare to the osmotic pressure of the pure liquid?
The osmotic pressure of the pure liquid is more as company to the osmotic pressure of the solution.
A strain large than the osmotic strain is implemented to the answer side , the natural solvent flows out of the answer thru semi - permeable membrane and this phenomenon is known as as opposite osmosis.
Since attention of solute is extra in an answer than in natural water, water from natural water attempts to diffuse or go through osmosis to the answer. Hence, the strain required to save you water access to the solution, i.e. osmotic strain of an answer is constantly better than that of natural water or solvent. As increasingly solute is dissolved withinside the solvent, the attention of the answer is going on increasing.
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how many ml of a 4% solution must be added to 500 ml of iv solution to achieve a solution concentration of 4 mg/ml?
Hence we have to add 20 ml of 4% solute in order to obtain a solution concentration of 4 mg/ml.
4 percent solution means 4 parts of solute are dissolved in 100 parts of solvent.
Therefore 4mg / 100ml = x mg / 500 ml
X= 4 * 500 / 100
X = 20
Concentration is a totally commonplace idea utilized in chemistry and associated fields. It's far the degree of the way an awful lot of a given substance there may be combined with some other substance.
The concentration of an answer is the degree of the amount of solute that has been dissolved in a given amount of solvent or solution. A concentrated solution is one that has a fantastically large amount of dissolved solute.
In chemistry, concentration refers to the quantity of a substance in a defined space. Any other definition is that attention is the ratio of solute in a solution to either solvent or overall answer.
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a researcher placed a culture of cyanobacteria under green lights. within a few weeks, the appearance of the cyanobacteria changed from green to red. the researcher claimed the color change in the culture was the result of an adaptation allowing greater photosynthesis.
The appearance of the cyanobacteria changed from green to red during photosynthesis because of the alteration of the major colored light harvesting protein.
To turn sunlight into energy photosynthesis is used. Photosynthesis is the process used by plants, algae and some bacteria to turn sunlight into energy. The process chemically converts carbon dioxide (CO2) and water into food (sugars) and oxygen. The chemical reaction often relies on a pigment called chlorophyll, which gives plants their green color. Photosynthesis is also the reason our planet is blanketed in an oxygen-rich atmosphere.
Cyanobacteria is a type of bacteria that performs photosynthesis. it utilize a photosensor to maximize their light-harvesting capacity under different light environments. A joint research team found a new photosensor that regulates yellow-green light-harvesting antenna in cyanobacteria. the appearance of the cyanobacteria changed from green to red. This color change is called complementary chromatic adaptation (CCA) is caused by alterations of the major colored light-harvesting proteins.
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Why is calcium chloride more effective than sodium chloride at De icing roads in the winter?
Calcium chloride is more effective than sodium chloride and dicing roads in the winter because it has a lower freezing point.
The calcium chloride solution when mixed with water has a lower freezing point in comparison with the sodium chloride solution there is why it makes it easier for us roads with calcium chloride solution.
The calcium chloride solution has a lower freezing point because of the van't hoff factor.
When we spread calcium chloride on the ice, it absorbs heat from the ice and melts the ice because it has a lower freezing point then the ice. This same thing cannot be done more effectively with sodium chloride solutions.
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What is the trend in the atomic radii as the atomic number increases across a period or row What is the exception to this trend?
Atomic radius is defined as the distance from the centre of the nucleus of the atom to its outermost shell.
Atomic radii of elements gradually increases in a group from top to bottom. As we go down a group, the atomic number increases, thus, the number of shells increases. Also, as we move down the group, the valence electrons are present in a higher shell and thus, the distance of valence electrons from the nucleus increases. As a result of this, the force of attraction between the nucleus and the valence electron decreases. Therefore, the atomic radius increases on moving down a group.
Higher principal energy levels consist of orbitals which are larger in size than the orbitals from lower energy levels. The effect of the greater number of principal energy levels outweighs the increase in nuclear charge, and so atomic radius increases down a group.
As we move across a period from left to right, the atomic radii decreases gradually. In a period, there is gradual increases in the nuclear charge from left to right. As the atomic number increases in a period, the electron enters in the same shell. Thus, they are more and more strongly attracted towards the nucleus. As a result of this force of attraction from the nucleus, the atomic radii gradually decreases.
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What is an example of a transition phase?
during a chemistry lab exploring chemical reactions, students placed a 30g antacid tablet in a zip-lock bag. then they added 50 grams of water and quickly sealed the bag. the tablet began to fizz and soon disappeared. the bag was filled with gas. how much gas was produced if the mass of the liquid after the reaction is completed is still 50 grams? question 3 options: 30 grams 80 grams 50 grams 90 grams
The two main postulates that was given by Antoine Lavoisier are, oxygen play an important role in combustion and the other is mass of the reactant and product is conserved. Therefore, the mass of the gas after the reaction is completed is 30g.
What is law of conservation of mass?According to Law of conservation of mass, mass can neither be created nor be destroyed. Mass can only be transformed from one form to another. The law of conservation of mass was given by Antoine Lavoisier. Every reaction in nature follow the law given by Antoine Lavoisier that is mass is always conserved.
mass of antacid tablet+ mass of water =mass of solution
30g+50 g=80g
mass of solution = mass of liquid +mass of gas
80g=50g+mass of gas
mass of gas=30g
Therefore, the mass of the gas after the reaction is completed is 30g.
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if the hypothalamus was not stimulated by estrogen, which pathways would be interrupted? check all that apply.
If the hypothalamus were not stimulated by estrogen, the pathways that would be disrupted would be:
Release of gonadotropin-releasing hormone from the hypothalamus.Release of luteinizing hormone from the anterior pituitary.Correct answer: letters B and D.
Because, without estrogen stimulation, the hypothalamus would be unable to send a signal to the anterior pituitary to release luteinizing hormone. Luteinizing hormone is necessary for the production of other hormones such as estrogen, so without it the other hormones would not be released.
The Importance of Estrogen Stimulation on Hormone ProductionThe hormone estrogen is essential to the production of other hormones and maintaining overall health in both men and women. Estrogen is produced in the ovaries of women and testicles of men, and it is responsible for the development of:
Sexual characteristicsRegulating the menstrual cycleMaintaining pregnancyEstrogen also plays a crucial role in stimulating the hypothalamus, which is responsible for releasing gonadotropin-releasing hormone and luteinizing hormone from the anterior pituitary. This hormone is responsible for triggering the production of other hormones, such as testosterone.
If the hypothalamus was not stimulated by estrogen, which pathways would be interrupted? check all that apply:
A) Release of gonadotropin-releasing hormone from the anterior pituitary
B) Release of gonadotropin-releasing hormone from the hypothalamus
C) Release of luteinizing hormone from the hypothalamus
D) Release of luteinizing hormone from the anterior pituitary
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What is the balance equation of NaOH H₂so₄ → Na₂so₄ H₂o?
The balanced chemical equation is as follows:
2NaOH+H2SO4→Na2SO4+2H2O.
Given chemical equation is NaOH + H₂so₄ → Na₂so₄ + H₂o and this equation is not balanced as number of atom is not equal in both product and reactant side.
In the above equation there are 2 atoms in product sodium(Na) on the product side whereas 1 atom in the reactant side, So to balance it multiply NaOH by 2.
Now Hidrogen(H), Oxygen(O) and sulphate(so₄) are also unbalanced, to balance these atom multiply H₂so₄ and H₂O by 2.
So, Balanced chemical equation will be ;
2NaOH+H2SO4→Na2SO4+2H2O.
What is a Balanced equation ?
A balanced equation is a chemical equation in which mass is conserved and there are equal numbers of atoms of each element on both sides of the equation.
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