The mole is an SI unit that links the microscopic and macroscopic world that is why yes, mole is the base of SI unit.
What is a mole?
A mole is a popular scientific measurement unit for large quantities of very small items like atoms, molecules, or other specified particles in chemistry. It can also be spelt mol.
A extremely big amount, 6.02214076 1023 units, are designated by the mole. As of May 20, 2019, the General Conference on Weights and Measures defined the mole as this quantity for the International System of Units (SI). The mole was traditionally defined as the number of atoms found by experimentation to be present in 12 grammes of carbon-12.
The quantity of units in a mole is also referred to as Avogadro's number or Avogadro's constant in honour of the Italian physicist Amedeo Avogadro. Equal volumes of gases under the same conditions, according to Avogadro.
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what is the purpose behind decantation
Decantation is widely used to purify a liquid by separating it from an insoluble particle suspension (e.g. in red wine, where the wine is decanted from the potassium bitartrate crystals to avoid unsavory taste).
Decantation is a process of separating solid-liquid mixtures or two or more immiscible liquids. Allowing the mixture to settle into various layers, the lightest/heaviest liquid layers are drained out.
This approach is used in the following ways:
1. Mud-water mixture separation (solid-liquid mixture)
2. Oil and water separation (immiscible liquid mixture)
3. Kerosene and water separation
Decantation is the process of separating liquid from solid and other immiscible (non-mixing) liquids by eliminating the liquid layer on top from the solid or liquid layer underneath.
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I need help with question 10 please
Answer:
Na,Ba,Ti on the same base placement on the periodic table.
Answer:
O,S,Se
Explanation:
Because they lose electrons and become an anion to become ionicly bonded and they are in the same period
Calculate the molar solubility of iron(II) hydroxide, Fe(OH)2, in a solution buffered at a pH of
13.15. The Ksp of Fe(OH)2 is 1.6 × 10−14.
The solubility of solute in a solution can be find out from the solubility constant Ksp and molar concentrations. The solubility of iron hydroxide in the solution is 3.19 ×10 ⁻¹⁶ M.
What is solubility?Solubility of substance is the fraction of its concentration which dissolves in a solvent at a specific temperature. The solubility constant Ksp is the product of molar concentrations of the ions in the solute.
It is given that the pH of the solution is 13.15. Thus, pOH = 14 -13.15 = 0.85.
[OH-] = Antilog (pOH) = antilog (0.85)
= 7.07 M.
The solute Fe(OH)₂ dissociates into Fe²⁺ ion and 2 OH- ions. Let s be the solubility of one mole of ion. Thus [Fe²⁺] = s. Then, the Ksp can be written as follows:
Ksp = [Fe²⁺] [OH-]²
1.6 × 10⁻¹⁴ = s × [7.07 M]²
s = 1.6 × 10⁻¹⁴/[7.07 M]²
= 3.19 ×10 ⁻¹⁶ M.
Therefore, the molar solubility of iron(II) hydroxide in the given solution is 3.19 ×10 ⁻¹⁶ M.
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Select the best answer for the question.
10. What's the structure of PF,? Is it polar or non-polar?
O A. Trigonal bipyramidal, non-polar
OB. Square pyramid, polar
O C. Square pyramid, non-polar
O D. Trigonal bipyramidal, polar
Which of the following compounds dissolves in water?
CBr4
C6H6
CCl4
H2S
Among the given compounds, H[tex]_2[/tex]S dissolves in water.
The dissolution of compounds in water depends on the polarity of that compound. As water is a polar solvent, polar compounds readily dissolve in water. As it is said that Like dissolves like, we can say that polar and ionic compounds dissolve in polar solvents while, non-polar compounds dissolve in non-polar solvents like benzene, hexane, and other organic solvents.
CBr[tex]_4[/tex], C[tex]_6[/tex]H[tex]_6[/tex], and CCl[tex]_4[/tex] are non-polar compounds and cannot dissolve in water due to the absence of d-orbital in carbon atoms so they cannot accept lone pairs of electrons from water. H[tex]_2[/tex]S is also non-polar but the presence of a large sulfur atom gets easily polarized as compared to carbon and thus it dissolves in water.
Thus, due to the presence of a Sulfur atom, hydrogen sulfide dissolves in water.
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How many liters of gasoline contain 1.98kg of gasoline
Answer:1.4652
Explanation:
0.74g/ml
0.74x1.98
=1.4652
What is the pH of a solution prepared by adding 25.0 mL of 0.199 M ammonia to 25 mL of 0.199 M hydrochloric acid solution?
The pH of a solution prepared by adding 25.0 mL of 0.199 M ammonia to 25 mL of 0.199 M hydrochloric acid solution is less than 7.
What is the pH of a solution?The pH of a solution is calculated as follows;
pH = - log ([H⁺])
Also, pH = 14 - pOH
The pH of the solution is determined as follows;
Moles of HCl = 0.199 M * 25 mL * 1L/1000 mL
moles of acid = 0.004975 moles
Moles of NH₃ = 0.199 M * 25 mL * 1L/1000 mL
moles of NH₃ = 0.004975 moles
0.004975 moles of HCl reacts with 0.004975 moles of NH₃
Since NH₃ is a weak acid, the pH of the solution is slightly lower than 7.
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What effect do energy levels have on effective nuclear charge?
A student claims that if the downward movement of an electron in a hydrogen atom from n = 6 to n = 2 emits a photon with a wavelength of 410 nm then the electron must absorb a photon with a wavelength of 410 nm to move from n = 2 to n = 6. Is the student correct? Justify your answer.
Since energy can neither be created nor destroyed, it follows that the wavelength that was absorbed by the electron is also emitted.
What is the Bohr model?We know that the Bohr model posses the idea that an electron could move from a lower to higher energy level by the absorption of a photon of light. Thus we know that, when we supply energy to the electron, it is that energy that leads to the electronic transition.
It is clear that the energy that the electron has taken in when it moves up is the same as the energy that it would give out when it comes down in accordance with the law of conservation of energy.
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A piece of metal (mass = 25.0 g) at 95.0 °C is placed in a styrofoam coffee cup containing 25.0 mL of water at 18.2 °C. At thermal equilibrium, the temperature of the water is 25.4. Assuming that no heat is lost to the cup or the surroundings, what is the specific heat capacity of the metal? The specific heat capacity of water = 4.18 J/g°C.
The specific heat capacity of the metal can be calculated using the calorimeter equation. The specific heat capacity of the metal is obtained as 0.406 J/(°C g).
What is specific heat capacity?The specific heat capacity of a substance is the heat energy required to raise its temperature by one degree celsius per one gram of that substance.
The calorimeter equation relating heat energy q, mass m and temperature difference ΔT and specific heat capacity c is written as:
q = mcΔT.
In the given system the heat energy is transferred from the metal to water thus the final temperature of both will be 25 °C. Thus, at thermal equilibrium we can write it as:
25 g × c (95 -25 °C) = 25 × 4.18 × (25 - 18.2 °C )
Where, mass of water can be taken as 25 g since its density is 1 g/ml. From this specific heat capacity of the metal c is calculated as follows:
c = [ 25 × 4.18 × (25 - 18.2 °C ) ] / 25 g × (95 -25 °C)
= 0.406 J/(°C g).
Therefore, the specific heat capacity of the metal is 0.406 J/(°C g).
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If 5 g of Al (26.98g/mol) reacts with 9 g of O2 (32 g/mol), how many grams of Al2O3 (101.56 g/mol) can be formed/
Based on the mole ratio of the reaction, the mass of aluminum oxide that is produced from the reaction between 5 g of aluminum and 9g of oxygen is 9.39 g.
What mass of aluminum oxide can be formed from the reaction between aluminum and oxygen?The mass of aluminum oxide that can be formed from the reaction between aluminum and oxygen is determined from the limiting reactant and the mole ratio of the reaction.
The mole ratio of the reaction is as given in the equation of the reaction below:
2 Al (s) + 3 O₂ (g) ----> Al₂O₃ (s)
The mole ratio of Al to O = 2 : 3
Moles of Al present = 5/27
Moles of Al present = 0.185 moles
Moles of O present = 9/32
Moles of Al present = 0.281 moles
Al is the limiting reactant
Mole ratio of Al to Al₂O₃ = 2 : 1
Mass of Al₂O₃ produced = 0.185/2 * 101.56
Mass of Al₂O₃ produced = 9.39 g
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Explain the reaction between iodine solution and polysaccharides by giving the structures of related Compounds.
The explanation of the reaction between the compounds is here.
What is compound?
A thing that is composed of two or more separate elements is called compound.
Sol-There is no chemical reaction. Know the extent between to react to react and fair play mixing I too means iodine and potassium I Od um ordered solution solution and I could not React directly as such bad form poorly I owed eight iron like I five and I seven. They negatively charged iodide in the negatively charged how you died. All right, come and did come about charge donor. The neutral iodine charging accepted a solution of iodine, a solution of iodine and potassium iodide um added in water had the light orange brown color, light orange brown color, orange brown color. Once a mileage is added it from another city complex. When once a mileage in my load I added it from another city complex.
When once a mileage in my load I added it from another city complezx.. The police have cried. The police had cried, the police have cried act as a George donor charges and the police have died. And the poly iodide act as a except her. The new council looks absorbing light of a different wavelength than polly iodide and the color turn dark dark blue. The object structure are poorly added inside the am I late helix Alex is not clear. Are bulky and sit inside the policy crowds of glucose units and could not get out of date.
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Arrange methanoic acid, methanol and methylamine in order of increasing boiling point
Answer: CH3-CO-CH3<CH3-CH2-OH<CH3-COOH
Explanation:
basically the boiling point depends upon the intermolecular hydrogen bonding. thus alcohol tends to have a higher boiling points then ketones because they have -OH group unlike carbonyl.
Explain how humans hear. Be sure to include the following terms in your response: outer ear, cochlea, eardrum, auditory nerve.
According to research, the ear is a complex organ that meets hearing, being of great importance to humans.
How humans hear?Hearing is a physiological process where sound waves, which are vibrations, enter through the outer ear and reach the middle ear, causing the eardrum to vibrate.
In this sense, the vibrations, in turn, cause the movement of small bones called stirrup, anvil and malleus, where they reach the organ of Corti, stimulating the auditory nerve and finally become nerve impulses that reach the brain.
Therefore, we can conclude that according to research, hearing is a process that implies that sound waves first impact the eardrum until finally reaching the auditory centers of our brain.
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a sample of an unknown gas has a volume of 8.00L at 1.00 atm and 25.0°C. How many moles of gas are present
Answer:
0.3269
Explanation:
You would use the ideal gas law along with the equation Pv=nrt when P is pressure, v is volume, n is the moles of gas you are solving for, r is a constant that is , and t is temperature,
So you are given pressure, volume, and temperature, so you would begin by plugging in your known values:
P = 1atm
V = 8.00 L
T = 298 K ( but you usually want to use Kelvin so you would add 273.15; this is because 0 C is 273.15 K and 25+273=298)
(1)(8)=n(0.0821)(298)
then
8=n(24.4658)
next isolate n by dividing 24.4658 on each side
8/24.4658 = n (24.4658/24.4658)
0.3269=n(1) or n
Please Help
How do I do this?
What volume of a 12.05 M KOH solution would contain 8.48 moles of solute?
Be sure to enter a unit with your answer.
o.703..litter
Explanation:
M=n/v(l)solution
so v=n/M..... =8.48/12.05=0.703...
6. Paula does 8000 J of work pushing a wheelbarrow to her garden. If the distance she
moved the wheelbarrow is 25 m, what force did she use to move the wheelbarrow?
A. 80 N
B. 320 N
C. 8000 N
D. 200 000 N
The amount of force will be 320 N.
Force can be defined as the ratio of work and distance. The unit of the force will be Newton. It can be represented by N. There are various type of force and they are tension force and frictional force.
The given data:
W = 8000J
d = 25m
The relation between the force, distance and work can be expressed as:
W = f×d....(i)
Put the given data in equation (i).
8000 J = f × 25m
f = 8000/25
f = 320 N
Therefore, the force will be 320 N.
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anyone???? Faraday second law of electrolysis
Answer:
"When the same amount of electricity is passed through different electrodes, the mass of electrodes liberated during electrolysis is directly proportional to its chemical equivalent."
What is the energy of the light emitted from an atom if the excited electron absorbs a photon with a wavelength of 622 nm?
Explanation:
E =hv
= h*3*10power8meterpersecond ÷6.22*10power of -7m
where h is planks constant
Energy of light emitted is 4117.64 * 10 ⁻²⁵. E= hv.
What is energy of electron?
An electron's energy is determined by where it is in relation to the atom's nucleus. The distance an electron in an atom has to travel from the nucleus depends on its energy level.
The mass of an electron is roughly 1/1836 that of a proton. The intrinsic angular momentum (spin) of the electron is given in units of the decreased Planck constant and has a half-integer value.
Energy has a negative sign, meaning that an electron is drawn to the nucleus. The electron has the least energy in the first orbit, and as n grows, or as it gets less negative, the electron's energy increases.
Therefore, Energy of light emitted is 4117.64 * 10 ⁻²⁵. E= hv.
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C2H4O2 + 2 O2 --> 2 CO2 + 2 H2O
20.0 grams of C2H4O2 is reacted with 15.0 grams of oxygen. How many grams of carbon dioxide would be produced?
15g of CO2 will be produced from 15g of O2 as 2 moles of O2 produces 2 moles of CO2
What is moles ?
In chemistry, a mole, sometimes spelled mol, is a common scientific measurement unit for significant amounts of very small objects like atoms, molecules, or other predetermined particles.
The mole designates 6.02214076 1023 units, which is a very large number. For the International System of Units (SI), the mole is defined as this number as of May 20, 2019, according the General Conference on Weights and Measures. The number of atoms discovered through experimentation to be present in 12 grams of carbon-12 was originally used to define the mole.
C2H4O2 + 2 O2 --> 2 CO2 + 2 H2O
2 unit of O2 produces 2 unit of CO2
15g of O2 produces 15g of CO2
15g of CO2 will be produced from 15g of O2 as 2 moles of O2 produces 2 moles of CO2
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Calculate the [OH−] and the pH of a solution with an [H+]=4.9×10−13 M at 25 °C .
[OH−]= M
pH=
Calculate the [H+] and the pH of a solution with an [OH−]=2.2×10−7 M at 25 °C .
[H+]= M
pH=
Calculate the [H+] and the [OH−] of a solution with a pH=8.66 at 25 °C .
[H+]= M
[OH−]= M
The [OH⁻] concentration is 1.9 × 10⁻² M and the [H⁺] concentration is 3.9 × 10⁻⁸ M
a) [ H⁺ ] = 4.9 × 10⁻¹³ M
pH = - log [ 4.9 × 10⁻¹³ ]
pH = 12.3
pH + pOH = 14
pOH = 14 - 12.3 = 1.7
pOH = -log [OH⁻]
[OH⁻] = 10^-1.7
= 1.9 × 10⁻² M
b) pOH = - log [ 2.2 × 10⁻⁷]
pOH = 6.6
pOH + pH = 14
pH = 7.4
pH = -log [H⁺]
[H⁺] = 10^-7.4
[H⁺] = 3.9 × 10⁻⁸ M
Thus, The [OH⁻] concentration is 1.9 × 10⁻² M and the [H⁺] concentration is 3.9 × 10⁻⁸ M
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what product is formed when magnesium undergoes combustion?
To solve such this we must know the concept of combustion reaction. Combustion reaction happens in presence of oxygen. Magnesium oxide is formed when magnesium undergoes combustion.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
When magnesium undergoes combustion, the magnesium oxide is formed.
2Mg+O₂[tex]\rightarrow[/tex]2MgO
Therefore, magnesium oxide is formed when magnesium undergoes combustion.
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what is the simplest formula of calcium Carbonate if it contains to 40% calcium,20% carbon, 48% oxygen?
The simplest form of calcium carbonate is CaCO3.
What is the use of Calcium carbonate?
Calcium carbonate can be used as a dietary supplement when the amount of calcium in a person's body is less. Calcium is used even as an antacid. Calcium is necessary by the body for bones, heart and muscles.
In this, we are not provided the direct masses, so we will use this percentage composition.
The number of moles of each element are:
Ca-40/40= 1
C- 20/12 = (1.6 considered to be 1)
O- 48/16 = 3
Now all the three will be divided with the lowest value and that is 1, so the ratio of Ca: C: O= 1:1:3
Therefore, the simplest formula is CaCO3.
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In a titration, 20 mL of 0.27 M NH3 was titrated with 0.20 M HCl. Calculate the pH of the resulting solution after the addition 0 mL of the acid? (give your answer to two decimal places) (Kb ammonia = 1.8 x 10-5)
The pH of 20 mL of 0.27 M NH₃ (ammonia) solution after 0 mL of acid is 11.34.
What is the pH of the solution ammonia solution after 0 mL of acid has been added?The pH of 20 mL of 0.27 M NH₃ (ammonia) solution after 0 mL of acid has been added is equal to the pH of the solution when no acid has been added.
The pH of the NH₃ solution is calculated from the dissociation equation and the formula below:
Dissociation equation: NH₃ + H₂O ⇄ NH₄⁺ + OH⁻
Kb = [NH₄⁺] * [OH⁻] / [NH₃]
Kb of NH₃= 1.8 * 10⁻⁵
From the equation of dissociation above, [NH₄⁺] = [OH⁻] = x
Kb = x²/ [NH₃]
x² = Kb * [NH₃]
x = √( Kb * [NH₃])
x = √(1.8 * 10⁻⁵ * 0.27)
x = 0.0022 M
[OH⁻] = 0.0022
pOH = - log [OH⁻]
pOH = -log (0.0022)
pOH = 2.66
pH = 14 - 2.66
pH = 11.34
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the substance that speed up the digestion stop working when they have been boiled, what does asim need to put in a fourth test tube to test this in his experiment?
please help me guys i need this like rn
It is expedient that Asim put some few pancreatic blood in a test tube to test for the functioning of digestive enzymes produced by the pancreas.
What is the purpose of the Asim experiment for digestive enzyme?When someone is considering the purpose of digestive enzyme experiments, it should be what is given below:
Objectives:
To identify the substrates and enzymes,Also to the reasons while the substance which speeds up digestion stopped.That being said, enzymes are organic, biological or biochemical catalysts which speed up the rate of chemical reactions. Within the context of the task given above, digestive enzymes help to speed up the digestion of food substances. In order to confirm why this substance stopped working, a pancreatic blood test needs to be done in a test tube to confirm the reasons why the substance stopped working.
However, some of the reasons why digestive enzymes stopped working include the following:
Concentration of the substancepH of the substance Temperature of the substanceSo therefore, screening for pH, concentration and temperature of the digestive enzyme can used to test for inactivity of enzymes.
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why do different types of matter have different requirements to phase change?
Different types of matter have different requirements because the pressure and temperature of a substance's environment dictate its phase.
Matter is anything that occupies space and has mass. The states or phases of matter include solids, liquids, gases, and plasma. Any material in a form that has a distinct shape and volume is referred to as a solid. Phase change refers to a shift in the condition of matter. Phase shifts can be carried out by people and occur frequently in nature.
A set of molecules will experience various movements, such as vibrations, rotations, and translations, depending on the average temperature in their vicinity.
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(6 pts) A compound was analyzed and found to contain 14.14% C, 2.38% H, and 83.48% Cl.
Determine the empirical formula for this compound.
The empirical formula for this compound is CH₂Cl₂.
C = 14.14% / 12 = 1.17
H = 2.38% / 1 = 2.38
Cl = 83.48% / 35.5 = 2.35
Now, divide by 1.17
C = 1.17 / 1.17 = 1
H = 2.38 / 1.17 = 2
Cl = 2.35 / 1.17 = 2
Therefore, The empirical formula for this compound is CH₂Cl₂.
In chemistry, the empirical formula of a chemical compound is the best entire variety ratio of atoms found in a compound.
There are three main types of chemical formulas: empirical, molecular and structural. Empirical formulas display the best whole-range ratio of atoms in a compound, molecular formulas show the quantity of every kind of atom in a molecule, and structural formulas display how the atoms in a molecule are bonded to every different.
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1. The symbol of an element represents one atom of that element.
e.g. Ca
= 1 calcium atom
What is the common use of minerals?
Answer:
Make Li-Ion batteries.
Produce commercial electric vehicles.
Create underwater subsea electrification.
Power telecommunication devices.
Explanation:
Minerals are essential raw materials in our daily lives, and are vital for economic, social and technological development. For example, in the following:
Agriculture: Phosphate rock, potash and lime are used in agricultural fertilisers and other mineral products are used to improve soil. The water you drink uses minerals to make it clean.
Construction: About 60 tonnes of aggregate are used to build an average house in the UK. If we include the associated infrastructure, this can be as high as 400 tonnes.
Minerals are used in building houses, schools, libraries, hospitals, offices and shops. Buildings use a wide range of minerals:
iron (as steel) in the framework of large building,
clay in bricks and roofing tiles,
slate for roofing tiles,
limestone, clay, shale and gypsum in cement,
gypsum in plaster,
silica sand in window glass,
sand and gravel and crushed rock as aggregates for fill and in concrete,
copper for plumbing and wiring,
clays for bathroom fixtures and fittings and tiles,
paint may include pigments, extenders and fillers from mineral sources.
Answer: toothpaste
Explanation:
The number of elections represented by the following set of quantum numbers is?
n=2 l=1 ml=-1 ms= 1/2
The number of electrons represented by the following quantum numbers is 1 electron
The set of numbers used to describe the position and energy of the electron in an atom are called quantum numbers. There are four quantum numbers, namely, principal (n), azimuthal (l), magnetic(m) and spin quantum numbers (s). The values of the conserved quantities of a quantum system are given by quantum numbers.
According to the data given, n=2 which means the shell number is 2, l =-1 means its the subshell is p and only one orientation, which can accomodate maximum of 2 electrons, but as the ms = 1/2 so we are here talking about just one electron with a +1/2 spin
Therefore with the above given quantum number the electron represented is one
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