Answer:chemical drive
The chemical energy contained in the bonds between the atoms of the carbohydrates in the grass is consumed by the cow when it eats grass. The grass will be broken down within the calf to produce energy that is used to create ATP.
Explanation:
chemical drive
The chemical energy contained in the bonds between the atoms of the carbohydrates in the grass is consumed by the cow when it eats grass. The grass will be broken down within the calf to produce energy that is used to create ATP.
how to do e notation learnign catalytics
E notation, also known as scientific notation, is a way of representing very large or very small numbers using exponential notation. In e notation, a number is represented as a coefficient multiplied by 10 raised to an exponent.
Here's how you can use e notation in Learning Catalytics:
Input the number in scientific notation using the letter "e" to represent "10^". For example, if you want to represent 1.23 x 10^4, you would input 1.23e4.
Use the e notation when answering questions that require it, such as numerical response questions or equation response questions.
If a question requires you to convert a number from standard form to e notation, you can use the following steps:
Count the number of places you need to move the decimal point to the right to get a coefficient between 1 and 10.
Write the coefficient followed by the letter "e" and the number of places you moved the decimal point, with a positive sign if you moved it to the right and a negative sign if you moved it to the left.
For example, if you need to convert the number 123,000 to e notation, you would move the decimal point 6 places to the left, getting 1.23. The e notation for 123,000 would then be 1.23e6.
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Is the following alkene E, Z, or neither? CH3 CH O E O Neither
The following molecule is neither E or Z configuration , it is the trans configuration.
The cis and trans approach will works if there is two identical groups that are connected to the double bond. The E, Z configuration works for the different substituent. the higher priority group on the each carbon is on the same or the opposite side of double bond. It is depends on the priority of the group.
The same group priority are on the same side of carbon double then it will be the Z configuration. If the same priority groups are on the opposite side than the configuration will be E configuration.
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Consider the following elementary gas-phase reversible reaction to be carried out isothermally with no pressure drop and for an equal molar feed of A and B with CA0 = 2. 0 mol/dm3. (a) What is the concentration of B initially? CB0 = _______ (mol/dm3)(b) What is the limiting reactant? _______(c) What is the exit concentration of B when the conversion of A is 25%? CB = ______ (mol/dm3)(d) Write –rA solely as a function of conversion (i. E. , evaluating all symbols) when the reaction is an elementary, reversible, gas-phase, isothermal reaction with no pressure drop with an equal molar feed and with CA0 = 2. 0 mol/dm3, kA = 2dm6/mol2·s, and KC = 0. 5 all in proper units –rA = _______. (e) What is the equilibrium conversion?(f) What is the rate when the conversion is:(1) 0%?(2) 50%?(3) 0. 99 Xe?
Considering the following elementary gas-phase reversible reaction to be carried out isothermally with no pressure drop,
The concentration of B initially, CB0 is 1.0 mol/dm3The limiting reactant is CThe exit concentration of B when the conversion of A is 25% CB = 12.5%The value of –rA solely as a function of conversion (i. E. , evaluating all symbols) when the reaction is an elementary, reversible, gas-phase, isothermal reaction with no pressure drop with an equal molar feed is –rA = CA0 /kA + kC = 2 /2.5 = 0.8The equilibrium conversion is given by r = kA*CA - kC*CC = 2*2-1*2.5=1.5The rate when the conversion is :1) 0% = 0
2) 50%= 0.5
3) 0.99Xe= 99%
When a chemical reaction is reversible, the reactants and products both react to create the final product at the same time.
Such a reaction involves constant forward and backward reactions between the reactants and products.
Simply said, when molecules collide, reactant bonds are disrupted, and the energy released from this broken connection is used to create new product molecules.
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Venus has an average distance to the sun of 0.723 AU. In two or more complete sentences, explain how to calculate the orbital period of Venus, and then calculate it.
Venus has an average distance to the sun of 0.723 AU. It completes an orbit every 224.7 days.
What is an orbital period ?The term orbital period is defined as the time it takes to complete one full orbit around a celestial body. “the orbit period depends on the altitude of the satellite” type of period.
Given :
A planet has an average distance to the sun of 0.66 AU,
a = 0.723 AU
The orbital period of the planet is determined using Kepler's law of planetary motion. Mathematically, the Kepler's law is given by :
T² = (4π²/GM)a³;
where T is in Earth years, a is distance from the sun in AU, M is the solar mass (1 for the sun), G is the gravitational constant.
In the given units, 4π²/G = 1
T² = 0.723³
T = 0.536
Earth years = 224.7 days
Thus, Venus has an average distance to the sun of 0.723 AU. It completes an orbit every 224.7 days.
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How many atoms of oxygen are in 2.50 moles of SO22?
Answer:
2.50
Explanation:
atoms. To find the number of oxygen atoms in 2.50 moles of SO2, we can use the following formula:
atoms = moles x Avogadro's number
Avogadro's number is approximately 6.02 x 10^23 atoms/mol.
atoms = 2.50 x 6.02 x 10^23
atoms = 15.05 x 10^23
So, there are approximately 15.05 x 10^23 atoms of oxygen in 2.50 moles of SO2.
group theoretical yield actual yield a 5.10 g 5.01 g b 4.99 g 4.38 g c 5.05 g 5.07 g
what is the percent yield of silver hydroxide based on group a’s results?
a) 9.00% b) 102.0% c) 98.2% d) 48.2%
Percent yield of silver hydroxide based on group a's results = 98.2%
Percent yield is calculated by dividing the actual yield of a reaction by the theoretical yield and multiplying the result by 100. The theoretical yield is the expected amount of product that should be obtained based on the stoichiometry of the reaction.
In group a, the theoretical yield of silver hydroxide is 5.10 g and the actual yield is 5.01 g. The percent yield can be calculated as follows:
Percent yield = (Actual yield / Theoretical yield) x 100 = (5.01 / 5.10) x 100 = 98.2%
Hence, the percent yield of silver hydroxide based on group a's results is 98.2%.
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Calculate the molecular masses of H2. ?
H2 has a molecular mass of 2 and a molecular weight of 1 u and 2u. When hydrogens join forces to form a hydrogen molecule, the result is a gas known as H2.
How can you determine an atom's mass?Find a Single Atom's Atomic Mass The alpha particle of a single particle can be determined by summing the total masses of the protons and neutrons in that particular isotope since their combined masses make up nearly each of the mass of a given atom.
How can you determine an element's atomic mass?The numbers of neutrons and protons in an atom are simply added to determine the atom of that particular atom. For instance,Think about an oxygen atom, which has 8 protons, 8 neutrons, and 8 electrons. You only need to multiply the atomic weight of oxygen by 8 electrons and 8 neutrons.
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what is the relationship between oxidation number and electronegativity?
The oxidation number and electronegativity are two different concepts in chemistry.
The oxidation number is a number assigned to an element in a chemical compound to indicate the degree of oxidation or reduction of the element. It reflects the charge an element would have if the compound were completely ionic.
Electronegativity is a measure of the ability of an atom in a molecule to attract electrons towards itself. It reflects the strength of an atom's hold on electrons in a covalent bond.
There is a correlation between oxidation number and electronegativity in the sense that elements with high electronegativity tend to have high oxidation numbers. For example, in a compound with a positive oxidation number, the more electronegative element will typically have a higher oxidation number than the less electronegative element. However, this is not a strict rule, as other factors such as the size of the element and the nature of the chemical bond also play a role.
In summary, while there is a relationship between oxidation number and electronegativity, they are two distinct concepts in chemistry with different definitions and applications.
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The reagents _____ and FeCl3 are required for the chlorination of benzene via electrophilic aromatic substitution
The reagents HCL and FeCl3 are required for the chlorination of benzene via electrophilic aromatic substitution.
What is the chlorination?
Chlorination is a chemical process in which one or more chlorine atoms are introduced into a molecule. In the context of benzene, chlorination refers to the reaction of benzene with HCl and FeCl3 to produce chlorobenzene via electrophilic aromatic substitution. In this reaction, the chlorine atom acts as an electrophile and reacts with the electron-rich aromatic ring of benzene, leading to the substitution of a chlorine atom for one of the hydrogen atoms in the ring.
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Investigators have found black and smokeless powder at the scene of a crime involving a fire. What is the BEST way for the investigators to analyze this
evidence?
A. by asking a dog to sniff it
B.
C.
D.
by using an ion mobility spectrometer (IMS)
by looking under a microscope
by washing it with acetone
These are some examples of traditional forensic analysis techniques:Hair and fiber analysis, spectroscopy, serology, and chromatography.
What techniques are utilized for evidence analysis? These are some examples of traditional forensic analysis techniques:Hair and fiber analysis, spectroscopy, serology, and chromatography (such as DNA examination)structural engineering, toxicology, pathology, anthropology, odontology, odontology, pathology, and review of suspicious documents.The crime scene staff may perform preliminary screening tests, sometimes known as presumptive testing, at the scene to assist in identifying the evidence that is most useful.Normally, traces of evidence at a crime scene shouldn't be taken from objects.As an alternative, the complete item should be processed in the lab.The evidence should be removed and packaged if it is tenuously attached to an object.Long before CSI arrives, the first step in an analysis of a crime scene is observation.It is used for police training.
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What is Calcium Nitrate?
Calcium nitrate, also called Norgessalpeter (Norwegian salpeter), is an inorganic compound with the formula Ca(NO3)2(H2O)x.
What are compounds ?
A compound is a substance consisting of two or more elements chemically combined in a fixed ratio. They differ from mixtures consisting of two or more substances physically mixed without chemical bonding. Compounds have their own physical and chemical properties that differ from those of individual elements. For example, the compound water (H2O) has different properties (boiling point, density, solubility, etc.) than its components hydrogen (H2) and oxygen (O2).
Compounds are formed by chemical reactions in which atoms of different elements combine to form new substances. The formation of a compound can be represented by a chemical formula that indicates the type and number of atoms in the compound.
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How do you know if two atoms will bond?
Answer:
The factor that determines whether or not two atoms will bond to form a molecule is their number of valence electrons.
Explanation:
Two atoms will bond if they have a difference in electrical charge. Atoms with an unequal number of protons and electrons have an electric charge, and when they come together they will form a chemical bond.
What is electrical charge?Electrical charge is an important physical property of matter that exists in two forms, positive and negative. Positively charged particles, such as protons, are attracted to negatively charged particles, such as electrons. In the most basic sense, electrical charge is simply a measure of the quantity of protons and electrons in a given object. In other words, it is a measure of the object's ‘electrical balance’. All matter is made up of atoms, and atoms are made up of positively charged protons and neutral neutrons, as well as negatively charged electrons. The number of protons and electrons in an atom is always equal, meaning that the atom (and therefore the object it is part of) has no net charge.
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An empty volumetric flask weights 74.85 grams. After 25.0 mL of a liquid is added, the flask and liquid weigh 111.50 g. What is the density of the liquid?
Density of liquid is calculated to be equal to 1466 kg/m^3.
What is density?Density is the mass per unit of volume of substance and the symbol for density is ρ .
Mass of liquid = 111.50 g - 74.85 g = 36.65 g
Convert the volume of the liquid from milliliters to cubic meters. We can do this by using the conversion factor of 1 mL = 10^-6 m^3:
volume of liquid = 25.0 mL x 10^-6 m^3/mL = 2.50 x 10^-5 m^3
Density of liquid = mass of liquid / volume of liquid = 36.65 g / (2.50 x 10^-5 m^3)
= 1466 kg/m^3
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the density of silver is 10.5 g/ml. what mass of silver (in mg) has a volume of 15 ml?
Answer:
157,500mg
Explanation:
Mass = density × volume
= 10.5 g/ml × 15 ml
= 157.5 g
Since the answer is asked in mg we will have to convert 157.5 g to mg:
157.5 × 1000 = 157, 500mg
The mass of silver with a volume of 15 ml can be calculated as follows:
mass = density × volume mass = 10.5 g/ml ×15 ml mass = 157.5 g
Since 1 g = 1000 mg, then 157.5 g = 157.5 × 1000 mg = 157,500 mg.
So, the mass of silver with a volume of 15 ml is 157,500 mg.
Silver is a dense metal with a high melting and boiling point, which is something to keep in mind. It is an important material in numerous industries, including electronics, jewellery, and coinage due to its excellent electrical and thermal conductivity. Because of its antibacterial qualities and because of its particular shine and malleability, it is also widely employed in the arts and in the medical area. Although silver's density is largely constant, conditions like temperature and purity can have an impact. The ability to calculate a substance's volume and mass using its density is another useful attribute that is significant in disciplines like materials science and engineering.
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how is the beginning and end of a range of a boiling point defined?
The beginning of a boiling point is the temperature at which a substance boils under standard conditions of 1 atm pressure and the end of a range of a boiling point is the temperature above which a substance can no longer be liquefied.
The range of a boiling point refers to the difference between the lowest and highest boiling point of a substance. The boiling point of a substance is defined as the temperature at which its vapour pressure is equal to atmospheric pressure and it changes from a liquid to a gas. The normal boiling point is usually used as a reference point to compare the boiling points of different substances.
On the other hand, the end of a boiling point range is defined as the “critical temperature” which is the temperature above which a substance can no longer be liquefied no matter how much pressure is applied. At this temperature, the vapour pressure of the substance is equal to its critical pressure, and it becomes a supercritical fluid.
It's essential to understand that the boiling point range is not a fixed value and can vary based on the pressure and temperature of the surrounding environment. In addition, some substances have a wide boiling point range, while others have a narrow range.
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gaseous ethane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . suppose 1.50 g of ethane is mixed with 8.6 g of oxygen. calculate the maximum mass of water that could be produced by the chemical reaction. round your answer to significant digits.
The maximum amount of water is only 38 g H2O because C2H6 is the limiting reactant and the amount of water in C2H6 is lower (2 significant digits)
According to the reaction equation; 2CO2(g) + 3H2O = C2H6(g) + 7/2O2(g) (g). Next, we change the provided reactant masses to reactant moles. The number of moles = mass/molar mass = 7.82g/30gmol-1 = 0.261 moles for ethane. The number of moles = 9.9 g/32 gmol-1 = 0.31 moles for oxygen The limiting reactant, which produces the least quantity of product, is what we identify next. As for ethane; 0.261 moles of Ethane produce 0.261 3 = 0.783 moles of water, according to the reaction equation. for oxygen. 3 moles of water are produced by 3.5 moles of oxygen. 0.31/3/3.5 = 0.266 moles of water are produced from 0.31 moles of oxygen. So, the limiting reactant is oxygen. Water produced as a mass equals 0.266 moles of water times 18 gmol-1, or 4.79 g of water. Ethane produces 3 moles of water from 1 mole.
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If 15.0g of N₂O4 was produced, how many moles of O2 were required?
The number of mole of O₂ required for the reaction if 15.0 grams of N₂O4 is produced, is 0.326 mole
How do I determine the mole of O₂ required?We'll begin by obtaining the number of mole in 15.0 g of N₂O₄. Details below:
Mass of N₂O₄ = 15 gMolar mass of N₂O₄ = 92 g/molMole of N₂O₄ =?Mole = mass / molar mass
Mole of N₂O₄ = 15 / 92
Mole of N₂O₄ = 0.163 mole
Next, we shall write the balanced equation for the reaction. This is givrn below:
N₂ + 2O₂ -> N₂O₄
From the balanced equation above,
1 mole of N₂O₄ was produced from 2 moles of O₂
Finally, we shall determine the number of mole O₂ required for the reaction. Details below:
From the balanced equation above,
1 mole of N₂O₄ was produced from 2 moles of O₂
Therefore,
0.163 moles of N₂O₄ will be produced from = 0.163 × 2 = 0.326 mole of O₂
Thus, number of mole of O₂ required is 0.326 mole
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If salicylic acid dissociated into two particles when dissolved into myristic acid (it does not), would this change your calculated Kr value? Explain why.
The dissociation of salicylic acid into two particles does not modify the amount of solute in either phase, the ratio of solute concentration in one phase to concentration in the other phase remains constant. As a result, the dissociation has no effect on the computed Kr value.
The partition coefficient, commonly known as the Kr value, is a measure of the distribution of a solute between two immiscible phases. It is determined by the ratio of the solute concentration in one phase to the concentration in the other.
It is crucial to note that the dissociation of a solute into many particles can influence the solute's solubility in a given solvent, but this has no effect on the Kr value because the Kr value is a measure of the solute's distribution between two phases, not its solubility in a specific solvent.
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How many set(s) of magnetically non-equivalent protons are found in (CH3)2CHCH2CH2CI?
a) 3
b) 4 c) 5 d) 7 e) 11
Option B. 4. The molecule (CH3)2CHCH2CH2CI has 4 magnetically non-equivalent protons. These protons are found on the methylene (-CH2-) and methine (-CH-) groups in the molecule.
The symmetry of the molecule and the coupling between the protons can lead to some protons being magnetically equivalent, meaning that they have the same chemical shift and coupling constants. However, there are 4 distinct sets of protons in this molecule that are magnetically non-equivalent. In the molecule (CH3)2CHCH2CH2CI, there are 4 sets of magnetically non-equivalent protons, each having a different chemical environment and hence a different magnetic environment. These protons can be found on the carbon atoms that are bonded to different number of hydrogens and other atoms.
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Select all paramagnetic species.
Group of answer choices:
- atomic sodium
- iron(III) ion
- fluoride ion
- calcium(II) ion
- zinc(II)
Paramagnetic species are fluorine , calcium , iron(III) ion . Atomic sodium and zinc(II) are diamagnetic species.
Elaborating :Compounds that are paramagnetic always have one or more unpaired electrons that are drawn to the magnetic poles.
Because one of the remaining p orbitals of fluorine contains an unpaired electron, the element is paramagnetic in this case.
Sodium is diamagnetic, and Zn(II) is diamagnetic because it has all paired electrons. Calcium(II) is assumed to be paramagnetic because it excites one electron from its s-orbital to its exctied d-orbital. Iron(III) is paramagnetic because it needs unpaired electrons.
How does paramagnetic work?Substances with impaired electrons that are attracted by a magnetic field are called paramagnetic. In the absence of a magnetic field, they lose their magnetism. The substance's magnetic moment and, consequently, its paramagnetism increase with the number of unpaired electrons.
Why is it referred to as paramagnetic?The majority of atoms with incompletely filled atomic orbitals are paramagnetic, with the exception of copper, due to the presence of unpaired electrons in the material. Unpaired electrons have a magnetic dipole moment and behave like tiny magnets because of their spin.
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count the total number of sigma bonds and pi bonds in the compound below
Covalent bonds are one of the most important types of chemical bonds formed by the overlapping of an element's atomic orbitals. Because of this overlapping, a very strong bond is formed, and covalent bonds are the strongest known bonds.
A molecule can contain both sigma bonds and pi bonds.
A single bond in a covalent bond is always a sigma bond.
A double bond consists of a sigma bond and a pi bond, whereas a triple bond consists of two pi bonds.
When we look at the molecule, we can see that it has 14 single bonds, 1 double bond, and 1 triple bond.
As a result, the molecule has 16 sigma bonds.
(14+1+1)
The total number of pi bonds 3(1+2).
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what is the final temperature of the aluminum and water, given that the specific heat of aluminum is 0.903 j/(g·°c)?0.903 j/(g·°c)? assume no heat is lost to surroundings.
Given that aluminum has a specific heat of 0.903, the combined temperature of the metal and water is 34.61 °C.
With temperature and pressure, how do you determine the end temperature?Calculate the pressure to temperature ratio using the formula k = p1/T1. The comparable pressure in a similar container can be determined by multiplying any temperature value by k: p2 = k T2. By multiplying each amount of pressure by k, you can determine the temperature.
How can you determine the mixture's final temperature?Using the formula T(final) = (m1 T1 + m2 T2) / (m1 + m2), determine the final temperatures of the water mixture. T1 denotes the temperature of the first container of water, T2, and m1 and m2 denote the weights of the initial second containers of water, respectively.
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As the number of bonds between two carbon atoms increases, which of the following decreases? O the number of electrons between the carbon atoms only O the bond length and the bond energy O the bond energy only O the bond energy and the number of electrons between the carbon atoms O the bond length only
As the number of bonds between two carbon atoms increases, the bond length decreases.
What happens as the bond number between two carbon atoms increases?As the number of bonds between two carbon atoms increases, then the bond length decreases.
The bond energy also increases with the number of bonds between the carbon atoms. The number of electrons between the carbon atoms does not change with the number of bonds, but rather depends on the valence electrons of the carbon atoms themselves.
C-C bond has longest covalent bond distance. Among, C, N, O and H, covalent radius of C is maximum. Non polar bond length is higher than the polar bond length.
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a homogeneous mixture of one or more solutes dissolved in a solvent
Consider the following reaction at some temperature: H_2O(g) + CO (g) H_2(g) + CO 2(g) K = 2.0 Some molecules of H_2O and CO are placed in a 1.0-L container as shown below. l When equilibrium is reached, how many molecules of H_2O, CO, H_2, and CO_2 are present? Do this problem by trial and error-that is, if two molecules of CO react, is this equilibrium; if three molecules of CO react, is this equilibrium; and so on.
The number of molecules of each species present at equilibrium can't be determined by trial and error.
The law of mass action and the equilibrium constant (K) determine the ratio of the concentrations of reactants and products at equilibrium, b. To find the number of molecules, you would need to know the initial concentrations of H_2O and CO and use an equilibrium expression to calculate the concentrations at equilibrium. Write down the balanced chemical equation for the reaction: H_2O(g) + CO (g) H_2(g) + CO_2(g)Define the initial concentrations of H_2O and CO. Write the equilibrium expression using the balanced chemical equation and the initial concentrations. Substitute the value of the equilibrium constant (K = 2.0) into the expression. Use the equation to solve for the equilibrium concentrations of H_2O, CO, H_2, and CO_2.Repeat the process for different initial concentrations of H_2O and CO to check if the results change. Verify that the sum of the concentration of reactants and products remains constant, as required by the law of mass conservation
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How many grams (g) are in 0.329 moles of Ba3(PO4)2?
Answer:
About 203.381 grams
Explanation:
We need to first determine the molar mass of Ba3(PO4)2.
We have:
3 Bariums - 137.327*3 = 411.981
2 Potassiums - 39.098*2 = 78.198
8 Oxygens - 16*8 = 128
Add these together and we get 618.179 g/mol
If we only want 0.329 moles, then we multiply those two numbers together to get about 203.381 grams.
when a narrow diameter glass tube is inserted into a body of water, water rises in the tube and its surface inside is concave upwards. which statement, concerning the strength of the intermolecular forces between glass and water molecules compared to those between water molecules, is accurate? question 5 options: a) intermolecular forces are irrelevant to this situation. b) the forces of attraction between the glass and water are the same as those in water. c) the forces of attraction between the glass and water are stronger than those in water. d) the forces of attraction between the glass and water are weaker than those in water.
when a narrow diameter glass tube is inserted into a body of water, water rises in the tube and its surface inside is concave upwards. which statement, concerning the strength of the intermolecular forces between glass and water molecules compared to those between water molecules, is accurate
Option c is correct answer,
c) The forces of attraction between the glass and water are stronger than those in water.
Adhesion, which is connected to water's comparatively high surface tension, generates a force. Because the attraction between the glass and the water is often greater than that of the water itself, the concave force develops. You typically see a concave force, which is created when the molecules of the liquid are attracted to the molecules of the container.
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What is the mass of potassium nitrate that is produced when 2.04 moles of potassium phosphate react?
As per the balanced reaction, one mole or 212.7 g of potassium phosphate gives 3 moles or 303.3 g of potassium nitrate. Then, 2.04 moles or 433 g of potassium phosphate is 619.1 g.
What is potassium nitrate ?Potassium nitrate is an ionic compound formed by donating electrons from the potassium metal to the nitrate group.
As per the given reaction, 1 mole of potassium phosphate gives 3 moles of potassium nitrate.
molar mass of potassium phosphate = 212. 2 g
molar mass of potassium nitrate = 101.1 g
mass of 3 moles of potassium nitrate = 303.3 g.
Mass of 2.4 moles of potassium phosphate = 2.4 ×212. 2 g = 433.3 g.
Then, the mass of potassium nitrate formed by 433.3 g of potassium phosphate is :
(433.3 g× 303.3 g)/212.7 g = 619.1 g
Therefore, the mass of potassium nitrate is 619.1 g.
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Your question is incomplete. But your complete question is:
K3PO4 + Al(NO3)3 → 3KNO3 + AlPO4
a. What is the mass of potassium nitrate that is produced when 2.04 moles of potassium phosphate react?
Methyl red has a pKa of 5.0 and is red in its acid form and yellow in its basic form. If 0.120 M HCl is slowly added to the 24.0-mL sample of 0.120 M NaOH, in what pH range will the indicator change color?
As 0.120 M HCl is gradually added to a 24.0 mL sample of 0.120 M NaOH, the Methyl Red indicator will change colour in the pH range between 5.0 and 7.0. The indicator will transition from its yellow basic form to its red acid form as the pH decreases from its starting value of 13.0 to 7.0.
The pKa value and the associated colours of the indicator in its acidic and basic versions can be used to establish the pH range for Methyl Red indicator's colour shift. Methyl Red's pKa value is 5.0, which indicates that the indicator exists in equal levels in both its yellow basic and red acid forms at a pH of 5.0. The indicator will predominantly exist in its red acid form as the pH falls below 5.0 and in its yellow basic form as the pH rises over 5.0.Adding 0.120 M HCl to a sample of 24.0 mL of 0.120 M NaOH will cause a neutralising reaction that will result in a solution.
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If 75.0 mL of a .650M solution of methylamine is reacted with 7.50 grams of methylamine chloride (CH3NH3Cl), what is the new pH if the original pOH was 1.744? Kb = 5.0 x 10-4
Please explain
The pH of acid is between 0-7 on pH scale while for base pH range is from 7-14. pH is a unitless quantity. Therefore, the pH of the solution is 2.7.
What is pH?
pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. More the value of hydronium ion concentration, more will be the solution acidic.
On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution. pH depend on the temperature. At room temperature pH scale is between 0 to 14. pH of neutral solution is 7.
Number of moles = .650M ×75.0 mL = 3.5 × 10⁻³ moles
Molarity of the methylamine = 3.5 × 10⁻³ moles/75.0 mL = 0.012 M
AH(aq) +H₂O ⇔H₃O⁺ (aq) + A⁻(aq)
I 0.012 0 0
C - x +x +x
E 0.012 -x x x
Kb= Antilog (-3.5) =5.0 x 10⁻⁴
Kb = [H₃O⁺] [A⁻]/[AH]
3.2 × 10⁻⁴ = x²/0.012 -x
3.2 × 10⁻⁴ (0.012 -x ) = x²
3.84 ×10⁻⁶ - 3.2 × 10⁻⁴x = x²
Solving the resulting quadratic equation
x=0.0018 M
pH=-log(0.0018 M) = 2.7
Therefore, the pH of the solution is 2.7.
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