Molecules in 4 moles of glucose are 24.088x10²³.
We need to find the number of molecules by applying the concept of moles
number of moles(n)= Number of Molecules(N)/Avogadro's Number(Nₐ)
n=N/Nₐ
4=N/6.022x10²³
N=24.088x10²³
Therefore, the number of molecules in 4 moles of Glucose is 24.088x10²³.
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in part 2 of the experiment, you will be analyzing a sample of household bleach. a 0.0854 g sample of household bleach is completely reacted with ki(s). the resulting solution is then titrated with 0.150 m nas2o3 solution. 0.890 ml of the solution is required to reach the colorless endpoint. what is the mass percent of naocl (mm
There is 5.8 % of NaOCl in the sample.
The oxidation of hypochlorite is the first process, which goes as follows:
OCl^- + 2I^- + 2H^+ -----> I2 + Cl2 + H2O
Iodine and sodium thiosulfate react in the second stage as follows:
I2 + 2NaS2O3 -----> Na2S4O6 + 2NaI
Thiosulfate moles = 0.150 M * 0.890/1000 L = 1.335 * 10-4 moles.
Since 2 molecules of thiosulfate react with 1 mole of I2,
1.335 * 10-4 moles of thiosulfate and x moles of I2 react.
x = 1.335 * 10-4 moles/2 moles times one mole.
Iodine equivalent to 6.675 x 10-5 moles
6.675 * 10-5 moles of hypochlorite were reacted because 1 mole of hypochlorite yields 1 mole of iodine.
Therefore, the mass of NaOCl is equal to 4.97 * 10-3 g (6.675 * 10-5 moles * 74.44 g/mole).
5.8% of NaOCl is equal to 4.97 * 10-3 g/0.0854 g * 100/1.
NaOCl makes up 5.8% of the sample.
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how does water help macromolecules carry out their functions
Use the concepts of energy and stability as they relate to
orbital filling to write the electron configuration for iron. (Look at image)
The orbital diagram shows us the number of electrons that can be found in the atom.
How do you fill up an orbital?We know that the orbital is a region in pace where there is a high probability of finding the electron. We also know that the filling of the electrons into the respective orbitals where they fall in can be done by the use of the Aufbau principle.
According to the Aufbau principle, it is clear that in the filling of the electrons into the orbitals, the orbitals that are lesser in energy are first filled. The orbitals that are lesser in energy are always found quite close to the nucleus.
This implies that the relative energies of the orbitals would tend to increase as we move away from the nucleus. In other words, the nucleus is the part of the atom that would be at the lowest energy. The orbital diagram of iron by the use of the Aufbau principle have been shown in the image attached to this answer.
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methane gas (ch4) reacts with oxygen (o2) to produce water vapor and carbon dioxide. what volume of water (h2o) and carbon dioxide (co2) will be formed from the complete reaction of 3 l of methane with oxygen if all the gases are held at the same temperature and pressure? group of answer choices
Thus, the consumption of 3 L of O₂ will produce 1.5 L of CO₂.
Is methane gas harmful to humans?Methane is non-toxic and poses no danger when inhaled in small amounts, but if significant amounts of the gas are allowed to replace air, the lack of oxygen could cause suffocating.
Briefing:In the reaction, CH₄+2O₂⇒CO₂+2H₂O
2 moles of O₂ consumption will produce 1 mole of CO₂.
In the gaseous phase, the relationship between the amount of compound and the volume is: PV=nRT
The volume and the amount of the gaseous compound are proportionate at the same temperature and pressure.
Thus, the consumption of 3 L of O₂ will produce 1.5 L of CO₂.
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Calculate the mass in grams of 2.73×1024 molecules of methanol. The chemical formula for methanol is CH4O.
The mass in grams of 2.73×1024 molecules of methanol is 154.20g.
given that:
no. of molecules = 2.73 × 10²⁴
molar mass of methanol (CH₄O) = 34.04 g/mol
moles of methanol = no. of molecules / Na
= 2.73 × 10²⁴ / 6.022× 10²³
= 4.53 mol
now, formula for the no. of mole is given as :
no. of moles = mass / molar mass
mass = no. of mole × molar mass
mass = 4.53 ×34.04
mass = 154.20 g
Thus, the mass in grams of 2.73 × 10²⁴ molecules of methanol is 154.20 g
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The seven diatomic elements (exist as two atoms bonded together in nature) are hydrogen (H2), Nitrogen (N2), Oxygen (O2), Fluorine (F2), Chlorine (C2), Iodine (I2) and Bromine (B2). Based on the position of the seven elements that are diatomic when pure in nature and the trends of the periodic table, which of the following characteristics would not describe them?
a) Smaller Atomic Radius
b) High Metallic Character
c) High Ionization Energy
d) High Electron Affinity
Answer:
Smaller Atomic Radius, High Ionization Affinity, and High Electron Affinity
[Note: It is Br2, not B2, the bomber]
Explanation:
a) Smaller Atomic Radius YES Each of these elements have a high number of electrons that nearly fill the lower energy orbitals, forcing the protons in the nucleus to cluster togeter more tightly.
b) High Metallic Character NO
c) High Ionization Energy YES - They want to keep their electrons, so the ionization energy is high.
d) High Electron Affinity YES They attract electons from anything that comes nearby.
A temperature change of 51 deg * C would be equivalent to a temperature change of
i don't know if you mean C° to F° but in F° the change would be 123.8°
What type of evidence can be pulled from both a computer and a portable device?
O Images
O Text history
O GPS coordinates
O Phone call data
Type of evidence can be pulled from both a computer and a portable device is images, text history, GPS coordinates
Computer is the machine that can store and process the information and it is an electronic device that manipulate information or data and type of evidence can be pulled and collected from digital device is
Computer documentsEmailsText and instant messages,TransactionsImagesInternet historiesThe above all examples of information that can obtained from electric devices
Therefore, the digital evidence can be pulled from both a computer and a portable device is images, text history, GPS coordinates
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(a)one of the alkali metal reacts with oxygen forms solid white substance. when this substance is dissolved in water, the solution gives a positive test for hydrogen peroxide, h2o2. when the solution is tested in a burner flame, a lilac-purple flame is produced. what is the likely identity of the metal? (b) write a balanced chemical equation for the reaction of the white substance with water.
Answer: An ionic bond.
Explanation:An ionic bond is the force of attraction that holds together positive and negative ions. It forms when atoms of a metallic element give up electrons to atoms of a nonmetallic element. Ionic bonds form only between metals and nonmetals
At standard temperature and pressure, a 0. 50 mol sample of h2 gas and a separate 1. 0 mol sample of o2 gas have the same.
0.50 mol of H₂ and 1.0 mol of O₂ have the same average molecular kinetic energy at standard temperature and pressure
Mass of H₂ and O₂ can be found by the formula given below;
m=n × M
mass of H₂= 0.50 × 2= 1g
mass of O₂=1.0 ×16= 16g
The formula to find average kinetic energy is as follows
K=[tex]\frac{3}{2}[/tex]K[tex]B}[/tex]T where K[tex]{B}[/tex]= Boltzmann constant
According to the conditions given above i.e standard temperature and pressure.
K∝T
So it is independent of the quantity of the sample i.e how much the amount of sample is present.
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Which of the following Periodic Table trends (characteristics) is incorrect?
a) electron affinity decreases from top to bottom on the periodic table
b) electronegativity decreases left to right across the periodic table
c) atomic radii decreases left to right across the periodic table
d) ionization energy decreases from top to bottom on the periodic table
(b) electronegativity decreases left to right across the periodic table
Electronegativity increases from left to right in a period across the periodic table.
Electronegativity is a relative property that defines the tendency to attract shared pair of electrons. It is a unitless parameter that is calculated by different formulae.
Pauling scale is widely used to calculate the electronegativity values of a covalent bond. e.g. F = 4.0, Cl = 3.0, etc.
⇒Electron affinity decreases from top to bottom in the periodic table.
⇒Atomic radii decrease from left to right in the periodic table.
⇒Ionization energy decreases from top to bottom in the periodic table.
phenylacetic acid (c6h5ch2cooh) builds up in the blood of phenylketonurics. when left untreated, this can lead to intellectual disability, seizures, behavioral problems, and even death. a 0.12 m solution has a ph of 2.62. what is the ka of phenylacetic acid?
The [tex]K_{a}[/tex] of phenylacetic acid is 4.76008×[tex]10^{-5}[/tex], when the pH of the solution is 2.62.
As we know,
pH = -log[[tex]H^{+}[/tex]]
[[tex]H^{+}[/tex]] = [tex]10^{-pH}[/tex]
[[tex]H^{+}[/tex]] = [tex]10^{-2.62}[/tex]
[[tex]H^{+}[/tex]] = 2.39×[tex]10^{-3}[/tex]
Also to find [tex]K_{a}[/tex] of phenylacetic acid we know another relation as:
[[tex]H^{+}[/tex]] = [tex]\sqrt{K_{a} .c}[/tex]
2.39×[tex]10^{-3}[/tex] = [tex]\sqrt{K_{a} .0.12}[/tex]
[tex]K_{a}[/tex] = 4.76008×[tex]10^{-5}[/tex]
Therefore, the [tex]K_{a}[/tex] of phenylacetic acid is 4.76008×[tex]10^{-5}[/tex], when the pH of the solution is 2.62.
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If 0. 75 g of a monoprotic weak acid required 22. 50 ml of 0. 510 m naoh to titrate it, what is the molar mass of the acid?.
The molar mass of the acid is 65 g/mol.
What is the molar mass of the acid?We know that the term neutralization is applied to the reaction between an ad and a base that produces salt and water only. In this case, we have been told that a monoprotic weak acid required 22. 50 ml of 0. 510 m sodium hydroxide to titrate it.
Let us recall that by the principle of the stoichiometry of the chemical reactions, the reaction between sodium hydroxide and a monoprotic acid has to be one is to one and we have to bear this in mind.
Thus;
Number of moles of sodium hydroxide = 22. 50/1000 L * 0. 510 M
= 0.0115 moles
This implies that 0.0115 moles of the acid was required also.
Since;
Number of moles = mass/molar mass
Molar mass = mass/Number of moles
Molar mass = 0. 75 g /0.0115 moles
= 65 g/mol
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Which of the following statements correctly identifies the synthesis reaction and explains why?
Only chemical reaction X, because one reactant is a compound
Only chemical reaction Y, because both reactants are elements
Neither chemical reaction X nor Y, because they have only one product
Both chemical reactions X and Y, because there are two reactants and a single product
Due to the presence of two reactants and a single product, both chemical reactions X and Y are possible.
Which of the following claims about a synthesis reaction is accurate?A synthesis reaction results in the formation of a single product that is more complicated than the initial reactants when two or more reactants are present.
Which of the following sums up a synthesis reaction the best?When two or more reactants unite to create a single product, the reaction is called a synthesis. The general equation A + B = AB is used to describe this kind of reaction.
According to the definition of synthesis reactions, two reactants unite to create a chemical. In a synthesis reaction, two or more substances mix chemically to generate a single compound or a product.
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Answer: A
Explanation: It said on Course Hero
phosphorus pentachloride, pcl5, a white solid that has a pungent, unpleasant odor, is used as a catalyst for certain organic reactions. calculate the number of moles in 55.7 g of pcl5
We have to calculate the moles of PCl₅ in the given gram. divide the gram by molar mass. the number of moles is 0.267 moles
What is mole?
The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12.
To find out the number of moles using the following formula.
mole = mass/molarmass
The molar mass of the PCl₅ = molar mass of phasphorus+ 5x molar mass of chlorine.
The molar mass of the PCl₅= 208.24 g/mol
mole = 55.7g÷208.24g/mol =0.267 moles
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Mole measure the number of elementary entities of a given substance that are present in a given sample. mass. The number of moles in 55.7 g of PCl₅ is 0.26 mole.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically,
mole =given mass ÷ molar mass
Molar mass of PCl₅= 208.24 g/mol
Given mass of PCl₅= 55.7 g
Substituting the given values we get
mole =55.7 g ÷208.24 g/mol
number of moles=0.26 mole
Therefore, the number of moles in 55.7 g of PCl₅ is 0.26 mole.
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1. State the general period and group trends among
main-group elements with respect to each of the
following properties:
a. atomic radii
b. first ionization energy
c. electron affinity
d. ionic radii
e. electronegativity
The general period and group trends among the main-group elements with respect to each of the following properties are as follows:
atomic radii - increase down the group; decrease across a periodfirst ionization energy - decrease down the group; increase across a periodelectron affinity - decrease down the group; increase across a periodionic radii - increase down the group; decrease across a periodelectronegativity - decrease down the group; increase across a periodWhat are periodic trends?Periodic trends are the trends followed by the properties of the elements going down a group or across a period in the periodic table.
The properties of elements that show periodic trends include:
a. atomic radii - the size of an atom of an element
b. first ionization energy - the energy required to remove a valence electron
c. electron affinity - the energy required to add an electron to a neutral atom
d. ionic radii - the size of the ion of an element
e. electronegativity - the ability to attract electrons
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a 1.80 m solution of nitrous acid is prepared. find the percent ionization. a second solution is prepared in the same manner except the solution also contains 0.71 m potassium nitrite. find the percent ionization. how much did the percent ionization decrease with the addition of the common nitrite ion?
The percent ionization in the nitrous acid solution is 1.97% before, and 0.0999% after the addition of sodium nitrate, which lowered the ionization 19.7 times.
To calculate percent ionization, we need to use the expression for the acidity constant of nitrous acid:
[tex]Ka = \frac{[H^{+} ][NO_{2} ^{-} ]}{[HNO_{2} ]}[/tex]
Ka - acidity constant (for nitrous acid, 7.1 * 10⁻⁴)
[H⁺] - concentration of H⁺ ions
[NO₂⁻] - concentration of nitrite ions
[HNO₂] - concentration of unionized nitrous acid
[H⁺] = [NO₂⁻]
[HNO₂] = 1.80 M - X
[tex]7.1 * 10^{-4} = \frac{X^{2} }{1.80 - X}[/tex]
When we transform the equation above, we get a quadratic equation:
X² + 7.1 * 10⁻⁴X - 12.78 * 10⁻⁴ = 0
Once we solve for X, we get:
X = 0.0354 M
Because the concentration of H⁺ ions (X) is equal to the concentration of the ionized nitrous acid, the percent ionization will be:
%ion = 100% * X / 1.80 M
%ion = 100% * 0.0354 M / 1.80 M
%ion = 1.97%
The second calculation is actually easier because we can safely assume that, with added sodium nitrite, all nitrite ions come from the salt, and the amount coming from the acid is negligible. With that in mind, the expression for the acidity constant will look like this:
[tex]7.1 * 10^{-4} = \frac{X * 0.71 }{1.80 M - X}[/tex]
When rearranged, we get this equation:
0.71 * X = 12.78 * 10⁻⁴ M - 7.1 * 10⁻⁴X
0.71071 X = 12.78 * 10⁻⁴ M
X = 12.78 * 10⁻⁴ M / 0.71071
X = 0.001798 M
%ion = 100% * 0.001798 M / 1.80 M
%ion = 0.0999%
So the addition of sodium nitrite resulted in 1.97 / 0.0999 = 19.7 times lower ionization of the nitrous acid.
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- Lead acid batteries used in cars contain a concentrated
solution of sulfuric acid. When these batteries are
recycled, their sulfuric acid is drained and neutralized to
produce water and sodium sulfate. Suggest a compound
that could be used to neutralize sulfuric acid and produce
sodium sulfate. Justify your choice by writing the chemical
equation for the reaction.
As per the chemical reaction ,sodium hydroxide can be used for neutralization of sulfuric acid as,2 NaOH+H₂SO₄[tex]\rightarrow[/tex]Na₂SO₄ +2 H₂O.
What are chemical reactions?Chemical reactions are defined as reactions which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.
There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical reactions:
1) inorganic reactions
2)organic reactions
3) biochemical reactions
During chemical reactions atoms are rearranged and changes are accompanied by an energy change as new substances are formed.
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The _______ the number of theoretical plates, the _______ the separation of a mixture of two liquids.
The N=(tR/σ)2 the number of theoretical plates, the distillation the separation of a mixture of two liquids.
Is more theoretical plates better?The effectiveness of a column is frequently determined using the number of theoretical plates. The range of plate numbers is 100 to 106. The quality of the separation improves with the number of theoretical plates present in a column because more equilibrations between the stationary and mobile phases are possible.
Why are theoretical plates important?The effectiveness of a column's column is closely tied to theoretical plates in column chromatography. It can therefore help to increase resolution, which, when all other factors are held constant, is directly proportional to the square root of the number of theoretical plates.
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What is the density of an object with a mass of 17.6g and a volume of 6 mL
Answer: 3.6 ml
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What element is this? In my family there are non-metals, metalloids, and metals. I am commonly used in the canning business and sometimes give soup a distinct taste. I've been known to "cry" if you've bend me too hard.
The element that has in its family non-metals, metalloids, and metals, which is commonly used in the canning business and sometimes give soups a distinct taste and that is also been known to "cry" if you bend it too hard is tin.
What is tin?
Tin is a chemical element found in the periodic table with atomic number 50 and which has the symbol Sn.
The characteristics of tin include:
Tin is a silver-colored metal.Tin is a soft metal such that it can be cut even when little force is appliedPure solid tin has a shiny lustrous appearance as is similar to most metals.Because of its high resistance to corrosion and soft nature, tin has been used for a wide variety of purposes which include:
it is used in the electroplating of steel cans used as food containers,it is used together with other metals in producing bearingsIt is used in soldering worksLearn more about tin at: https://brainly.com/question/2272323
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Facts for Globalization?
Answer:
Globalization has many benefits, such as the increased flow of goods, services, capital, and people across borders. This has resulted in increased trade and investment, which has led to higher economic growth rates and improved standards of living around the world.
Explanation:
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5. What percent of CuCl₂ is Cu?
Answer: The mass percent of copper in copper chloride is 47.23 %.
After Jenny finished collecting her data, she made the following table.
Toy Car Experiment
Distance Traveled
(meters) Total Time
(seconds)
10 7
20 14
30 21
40 28
50 35
60 42
Which of the following is true?
A.
It took the car less time to travel the first 10 meters than it did to travel the last 10 meters.
B.
The car was moving during the first 10 meters, but it was not moving during the last 10 meters.
C.
It took the car the same amount of time to travel the first 10 meters as it did to travel the last 10 meters.
D.
It took the car more time to travel the first 10 meters than it did to travel the last 10 meters.
Reset Submit
The true statement is: It took the car the same amount of time to travel the first 10 meters as it did to travel the last 10 meters (Option C)
How to determin which statement is trueThe following data were obtained from the question:
Distnce travelled: 10 20 30 40 50 60Time taken: 7 14 21 28 35 42Now, we shall determine the time taken to travel the first 10 m. This is shown below:
Distance = 10 - 0 = 10 mTime = 7 - 0 = 7 sNext, we shall determin the time taken to travel the last 10 m. This is shown below:
Distance = 60 - 50 = 10 mTime = 42 - 35 = 7 sFrom the above illlustration, we can see clearly that it took the car the same time to travel the first 10 m and the last 10 m.
Thus, the true statement is option C: It took the car the same amount of time to travel the first 10 meters as it did to travel the last 10 meters
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Based on its electron configuration, which element will most likely gain electrons from another element when forming an ionic compound?.
The element that is able to gain electrons and form an ionic bond is Iodine.
What is an ionic bond?The term ionic bond has to do with the kind of bond that is formed between a metal and a non metal. In this type of bond, there is a transfer of electrons from the metal to the non metal. s such the metal would become positively charged while the non metal would become negatively charged as we can see in the crystal of the ionic compound.
We just have to look at the string of elements that we have been given because, this is how we can be able to make a decision about which of the elements would be able to gain an electron. While doing this, we must keep in kind that it is only the non metal that are able to gain electron within the context of forming an ionic bond.
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Missing parts;
Based on its electron configuration which element will most likely gain electrons from another element when forming an ionic compound? Potassium , Vanadium, Iodine, Xenon
It is easier to separate liquids that have boiling points within a range of 5 degrees than it is liquids that have boiling points within a range of 10 degrees true or false?.
The given statement exists as false. The temperature at which a liquid's vapor pressure equals the pressure of the gas above it exists comprehended as the boiling point of the liquid.
What is meant by boiling point?The temperature at which a liquid's vapor pressure equals the pressure around it and the liquid transforms into a vapor is known as the boiling point of a substance. A liquid's boiling point varies depending on the atmospheric pressure in the area.
The temperature at which a liquid's vapor pressure equals the pressure of the gas above it exists comprehended as the boiling point of the liquid. The temperature at which a liquid's vapor pressure equals one atmosphere is considered the liquid's typical boiling point (760 torr).
The element with the lowest temperature at which an element would smolder is helium, and the element with the highest temperature is tungsten. The melting point is measured in degrees Celsius (C).
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aqueous ammonia is commercially available at a concentration of 16.0 m. how much of the concentrated solution would you use to prepare 500.0 ml of a 1.90 m solution?
Volume of 16.0 m aqueous ammonia solution required to prepare 500.0 ml of a 1.90 m solution is 50ml
What is molarity?Molarity is used to describe the concentration of a solution. Molarity, also called molarity, is the number of moles of solute (dissolved substance) per liter of solution. The unit of molarity is moles per cubic decimeter, written as mol dm⁻³ or simply M. A cubic decimeter is the same as a liter. In many old textbooks you can find concentrations in moles/liter written as mol l⁻¹
Original concentration x initial volume = final concentration x final volume.
We will use the equation (M₁)(V₁) = (M₂)(V₂)
Given,
M₁ = 16.0 m
M₂ = 1.90 m
V₂ = 500.0 ml or 0.5L
So, 16 × V₁ = 1.90 × 0.5
16 V₁ = 0.9 m
V₁ = [tex]\frac{0.9}{16}[/tex]
V₁ = 0.05L or 50ml
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why there is only one sodium ion for every chlorine ion, while there are two potassium ions for every oxygen ion?
There is only one sodium ion for every chlorine ion due to its valency.
The number of electrons that an atom needs to lose or gain in order to achieve a stable electron configuration i.e the octet of an element is known as the valency of an element, which serves as a gauge of that element's potential for combining.
The valency of Sodium (Na) is 1 and that of chlorine (Cl) is also one. therefore they combine to form a stable compound. The same rule follows in the compound formed by Potassium (K) and Oxygen(O) also. The valency of oxygen is 2 which means that it should be surrounded by 2 potassium ions to provide electrons to fulfill both the elements' octets.
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Alanine is a member of the twenty key amino acids that are used by our bodies to make proteins. Is this a chiral molecule?.
Alanine is a member of the twenty key amino acids which might be used by our bodies to make proteins: Pyrrolysine (not utilized in human protein synthesis). of those 20 amino acids, nine amino acids are crucial: Phenylalanine. Valine. Tryptophan.
Alanine is an amino acid that is used to make proteins. it's miles used to break down tryptophan and diet B-6. it's miles a source of power for muscle mass and the central fearful gadget. It strengthens the immune device and helps the frame use sugars.
Alanine, or α-alanine, is an α-amino acid this is used in the biosynthesis of proteins. It contains an amine organization and a carboxylic acid organization, both connected to the valuable carbon atom which also contains a methyl institution facet chain. Alanine is an amino acid this is used to make proteins. it's miles used to interrupt down tryptophan and diet B-6. it's miles a supply of electricity for muscle tissue and the critical apprehensive gadget. It strengthens the immune system and allows the frame to use sugars.
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Are other metals also suitable for obtaining copper out of oxide copper?
Answer: Yes
Explanation: More reactive metals in the reactivity series can displace copper from copper oxide just leaving copper on its own after the reaction. But usually, carbon is used to displace copper as its safe and more reactive.