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."
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
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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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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What effect do energy levels have on effective nuclear charge?
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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Suppose you wanted to measure 53 grams of water for a Phase Change
experiment. Explain why you would not need a Triple Beam Balance:
Triple beam balance is not used to measure the weight of water because it is used to measure mass.
The triple beam balance is an instrument used to measure mass very precisely. Such devices typically have a reading error of ±0.05 grams. Its name refers to its three beams, where the middle beam is the largest, the far beam of medium size, and the front beam the smallest.
Spring balance is used to measure the weight of the body whereas beam balance is used to measure the mass of the body. Since the mass of the body remains the same on earth as well as on moon but the acceleration due to gravity differs.
Therefore Triple beam balance is not used to measure the weight of the 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
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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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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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.
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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A buffer system is set up with [A] = 1.5[HA ]. If pKa = 5.4, what is the pH of the buffer?
5.57 is the pH of the buffer .
What is buffer ?
Buffer, in chemistry, usually a solution containing acids and bases or salts that tends to maintain a constant concentration of hydrogen ions. An ion is an atom or molecule that has lost or gained one or more electrons. A common buffer is a solution of acetic acid (CH3COOH) and sodium acetate. In aqueous solution, sodium acetate completely dissociates into sodium (Na+) and acetate (CH3COO-) ions. Buffer solutions with different hydrogen ion concentrations can be prepared by varying the buffer ratio and choosing acids of appropriate intrinsic strength. Commonly used buffers include phosphate, citrate, or borate and their salts
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1-Give some examples of buffer solutions.
2-Mention some applications of buffer solutions in Pharmaceutical Sciences.
Examples of buffer solutions include:
ammonia (NH₃)sodium acetate (NaC₂H₃O₂)acetic acid (HC₂H₃O₂)Some applications of buffer solutions in Pharmaceutical Sciences include:
to establish hydrogen ion activity for calibration of the pH meter using a buffer solution.to prepare isotonic dosage form formulations.to adjust the pH of systems in analytical procedures with the buffer solution.to maintain the stability of dosage forms. What are buffer solutions?A buffer solution is an aqueous solution consisting of a mixture of a weak acid and its conjugate base, or vice versa.
Buffers are broadly divided into two types
1. acidic buffer solutions and
2. alkaline buffer solutions.
Acidic buffers are solutions that have a pH below 7 and contain a weak acid.
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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...
Oxygen has a low boiling point because there are
A weak covalent bonds between the oxygen atoms
B
weak covalent bonds between the oxygen molecules
C
weak forces of attraction between the oxygen atoms
D weak forces of attraction between the oxygen molecules
The intermolecular forces between the oxygen molecules are very weak because of which a very less amount of energy is required for the oxygen to evaporate into a gas. There is no H-bonding or dipole movement present in oxygen molecules because of which the forces binding the molecules are absent in oxygen.
hence your correct option should be D
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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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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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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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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In the cisconfiguration, the methyl groups are placed _____.
on the same side of the double bond
on opposite sides of the double bond
in between the double bonds
to the left of the double bond
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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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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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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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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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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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
What is the molar solubility of barium phosphate (Ba3(PO4)2) at a temperature where the Ksp is (6.00x10^-37) (not at 25°C)?
The molar solubility of the barium salt is obtained as 1.29 * 10^-19 M.
What is the solubility?We know that the solubility has to do with the amount of the solute that is able to dissolve in a solvent at a particular temperature. As such, it is clear that the solubility depends on the temperature of the solution.
We know that the Ksp can be gotten from the expression of the Ksp as follows;
Ksp = [3x]^3 [2x]^2
Ksp = 9x^3 * 4x^2
Ksp = 36 * x^5
Ksp = 36x^5
x =[tex]\sqrt[5]{\frac{KSP}{36} }[/tex]
x = [tex]\sqrt[5]{6.00x10^-37} /36[/tex]
x = 1.29 * 10^-19 M
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1. The symbol of an element represents one atom of that element.
e.g. Ca
= 1 calcium atom
Hi, can someone please help me out with finding the answers.
write the IUPAC name and the Molecular formula
The IUPAC name and molecular formula for the following are,
a) prop-1-yne, C3H4
b) non-4-yne, C9H16
c) hex-3-yne, C6H10
What is IUPAC name?
International Unit for Pure and Applied Chemistry (IUPAC) is the method of naming the organic compounds in chemistry. It creates a standardized naming for the chemical compounds. There are prefixes, suffixes and parent chain considered while naming a compound.
The IUPAC name can be written by counting the parent chain carbons and considering the functional group present which is a triple bond in the given compounds. The molecular formula can be written by counting the number of different atoms present in the compound.
Therefore, the IUPAC name and molecular formula of the given compounds can be written as,
a) prop-1-yne, C3H4
b) non-4-yne, C9H16
c) hex-3-yne, C6H10
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