Carbon (C) contains the largest number of moles.
Number of Moles of a substance can be defined as the ratio of given mass of the substance to the Molecular Mass of the substance.
We can write,
Number of moles = Given Mass / Molecular Mass euation1
Given Mass of Na, C, Pb, Cu, Ne each = 10.0g
Molecular mass of Na = 22.9898 u
Molecular mass of C = 12u
Molecular mass of Pb = 207.2u
Molecular mass of Cu = 63.546 u
Molecular mass of Ne = 20.1797 u
After substituting the values of molecular mass and given mass of elements in equation1 , we will get
Number of moles of Na = (10/22.9898) = 0.4350
Number of moles of C = (10/12) = 0.8333
Number of moles of Pb = (10/207.2) = 0.0483
Number of moles of Cu = (10/63.546) = 0.1574
Number of moles of Ne = (10/20.1797) = 0.4955
So, we can clearly see that Carbon contains the largest number of moles.
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How does the inorganic portion of soil form?
A: Soils get formed by melting and cooling processes
B: Rocks get weathered by chemical and physical means to form soils.
C: Heat and pressure change rocks into soils
D: Sand and silt get deposited by rivers and streams
(Please help!! I need a A+!!!)
Answer:
B
Explanation:
seriously (MÀJÌKÁÎ DÊẞÜ)
For the gauge that reads gauge pressure, does the pressure reading decrease, increase, or remain the same?
The pressure reading increases.
Pressure (symbol: p or P) is the force applied perpendicular to the surface of an object per unit vicinity over which that pressure is distributed. Gauge stress (also spelled gage pressure)[a] is the stress relative to the ambient pressure.
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A molecule has an empirical formula of ch, and its molar mass is known to be 26 g/mol. What is its molecular formula?.
Molecular formula of a molecule is C₂H₂.
Empirical formula gives the proportion of the elements present in a compound.
The proportion od carbon and hydrogen is 1 : 1.
n(C) : n(Cl) = 1 : 1
n(C) = n(H) = n; amount of substance of carbon and hydrogen is the same in a molecule
M(molecule) = 26 g/mol; molar mass of a molecule
M(C) = 12 g/mol; molar mass of carbon
M(H) = 1 g/mol; molar mass of hydrogen
M(molecule) = n × M(C) + n × M(H)
M(molecule) = n × 12 g/mol + n × 1 g/mol
26 g/mol = n × 13 g/mol
n = n(C) = n(H) = 2
There are 2 atoms of carbon and two atoms of hydrogen in a molecule, so molecular formula is C₂H₂.
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Paracelcus (philippus aureolus theophrastus bombastus von hohenheim) was the first to articulate the foundational principle of toxicology, that the _____ makes the ______
Paracelsus (Philippus Aureolus Theophrastus Bombastus von Hohenheim) was the first to articulate the foundational principle of toxicology, that the dose that makes the poison.
Philippus Aureolus Theophrastus Bombastus von Hohenheim, in short Paracelsus, is the man who introduced the use of chemicals and minerals in medicine. He quoted that "In all things, there is a poison, and there is nothing without poison. It depends only upon the dose whether a poison is poison or not..." Since most of his prescriptions had the attention of arguments and fell out of favor, the use of arsenic is still active in killing certain parasites.
In the 16th century, his ideas on poison led to the introduction of chemistry into medicine. He was appreciated for these ideas when his presciption cured Louis XIV. The field of medicine would be different without his contributions.
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Determine the limiting reactant and calculate the number of grams of sulfur dioxide, so2, that can be formed when 27.3 g of methane thiol, ch3sh, reacts with 38.6 g of oxygen, o2.
When Methane thiol, CH₃SH, reacts with O₂, 25.8 grams of Sulfur dioxide, SO₂ is formed and limiting reactant is Oxygen, O₂.
The balanced chemical reaction is:
CH₃SH(g) + 3 O₂(g) → 2 H₂O(g) + CO₂(g) + SO₂(g)
Molecular weights: Actual/given mass:
CH₃SH = 48.11 g/mol 27.3 g
O₂ = 32.01 g/mol 38.6 g
H₂O = 18.01 g/mol
CO₂ = 44.01 g/mol
SO₂ = 64.06 g/mol
Number of moles = Given mass
Molecular mass
So,
moles of methane thiol = 27.3 ÷ 48.11= 0.56 moles
moles of oxygen = 32.01÷38.6 = 0.82 moles
From the reaction,
1 mole of CH₃SH reacts with 3 moles of O₂ to give 1 mole of SO₂
Thus, 0.56 moles of CH₃SH reacts to form 1 × 0.56 = 0.56 moles of SO₂
Mass of SO₂ produced is 0.56 × 64.06 g = 35.86 g
moles of SO₂ = 35.86 ÷ 64.06 = 0.55 moles
So,
use the isotope graph to find the isotopes described below. In each case, give the isotope name and the isotope symbol
a. Find three isotopes with equal numbers of neutrons and protons
b. Find Isotopes with the same number of protons.
c. Find two isotopes with the same number of neutrons.
d. Find two isotopes with the same atomic mass units.
O16, O17, and O18 are three isotopes with an equal number of neutrons and protons. Cl 35 and Cl 37 have an equal number of protons.
Isotopes:
Isotopes contain the same number of electrons and protons. They contain a different number of neutrons.
a. O16, O17, and O18 are three isotopes with an equal number of neutrons and protons.
b. Cl 35 and Cl 37 have an equal number of protons.
c. Isotopes are atoms that have the same protons but different neutrons.
Atoms called isotopes have the same atomic number but different masses as a result of a variation in the neutron count. Carbon-12 (C612), carbon-13 (C613), and carbon-14 (C614) are the three carbon isotopes that exist. Most elements have mixes of isotopes in their naturally occurring samples.Therefore, O16, O17, and O18 are three isotopes with an equal number of neutrons and protons. Cl 35 and Cl 37 have an equal number of protons.
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Osmium has a density of 22.6g/cm3. what volume (in cm3) would be occupied by 21.8g of osmium?
a. 0.965
b. 1.04
c. 493
d. 2.03x10-3
e. 2.03x103
The osmium with a density of 22.6g/cm3 has a volume in cm3 of 0.965 cm3
The density formula and the procedure we will use is:
ρ = m/v
Where:
v= volumeρ= densitym= massInformation about the problem:
m= 21.8gρ= 22.6g/cm3v= ?Applying the density formula and isolating the volume (v), we get:
ρ = m/v
v = m / ρ
v = 21.8 g / 22.6g/cm3
v = 0.965 cm3
What is density?It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.
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Why is it necessary to keep the temperature constant, but not the concentration of the reactants when determining the rate law expression through the initial rate method?
It is necessary to keep the temperature constant, but not the concentration of the reactants when determining the rate law expression.
What is the rate law expression?
A chemical reaction's rate and the concentrations of the reactants involved are correlated by an expression known as the rate law, commonly referred to as the rate equation or rate law equation.
A frequent way for determining rate laws is the concept of beginning rates. The method includes determining the starting rate of a reaction, as the name initial rate method would imply. To observe how the reaction rate varies, the measurement is repeated for several sets of beginning concentration conditions.
When establishing the rate law expression using the initial rate technique, it is required to maintain a constant temperature but not the reactant concentration because the rate constant fluctuates with temperature. k=Ae^-Ea/RT.
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Consider the reaction of 1,3,3-trimethylcyclohexene in the presence of nbs (w/trace hbr). how many products (including stereoisomers) can form?
The reaction of 1,3,3-trimethylcyclohexene in the presence of nbs (w/trace hbr) 3 products are formed.
1,3,3-trimethylcyclohexene in the presence of nbs (w/trace hbr) 3 products are formed 1,3,3-trimethylcyclohexene molecular formula is C9H16 in this structure 3 methyl group are present 2methyl are present in 1 carbon of benzene ring means 1 para position and 1 methyl group is present on meta position so in 1st step nbs means n bromosuccinimide attack on methyl group and br are are join means on para group 2 methyl are attach in that 2 methyl 1 methyl is attach to the br group now in 2nd step br are attach on allylic carbon in 3rd step br are attach on next para position so here 3 products are formed.
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If a yellow paint is to have 0.511% pbcro4 by mass, how many grams of chromite are needed per kilogram of paint?
Yellow paint has 0.511 % PbCrO4 by mass
Mass of PbCrO4 in 1 kg of paint = (0.511 / 100) * 1 kg = 0.00511 kg = 5.11 g
Moles of PbCrO4 = 5.11 g/ 323.19 g/mol
= 0.0158 moles
Moles of K2CrO4 also = 0.0158 moles
Moles of FeCr2O4 = 0.0158 moles K2CrO4 * (4 mole FeCr2O4 / 8 moles K2CrO4)
= 0.0079 moles
Mass of FeCr2O4 (chromite) = 0.0079 moles * 223.83 g/mol
= 1.77 g
Paints are divided into two types: oil-based paints and water-based paints. Oil paints are usually used as a primer, undercoat, and topcoat. In the past, we relied heavily on oil-based paints for surface durability and longevity, but today water-based paints are on par. It is used for prolongation and acts as a barrier against environmental influences. Paint consists of pigments, solvents, resins, and various additives. Pigments give the paint its color. Solvents make application easier. The resin helps dry. Additives range from fillers to antifungals. There are hundreds of different natural and synthetic pigments.
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an increase in pressure increasing the billing point is an example of a-
An increase in pressure increasing the billing point is an example of a physical property.
The term "boiling point" describes the temperature at which a liquid, which is being boiled, changes from a liquid to a vapor when its pressure equals that of its environment.Physical changes are those that take place when a material's structure is the same both before and after the change.When a substance is changed into another chemical substance, this is known as chemical transformation.When describing the state of a physical system, a substance's physical qualities are those that can be measured.A substance's characteristic that is seen in a chemical reaction is referred to as a chemical property.As it demonstrates the physical state, the increase in pressure with boiling point is an example of a physical property.
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The complete question is:
An increase in pressure increasing the boiling point of a liquid is an example of a —
A physical change
B chemical change
C physical property
D chemical property
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From the information provided in this module, when should emergency response training be provided?
From the knowledge provided in this module, emergency response training should be provided before starting work and as periodic refresher training.
What does routine refresher training entail?
Refresher training is applicable to all learning domains. This tactic is particularly important in compliance and safety training, as businesses typically have regulations for yearly or irregular reviews. Regular sessions make sure that students are continuously updated on the most recent information as well as intricate organizational procedures and processes.
Who needs to be trained on emergency action plan components?
OSHA mandates that all employees receive training on the emergency action plan. When any of the following occurs, employees must receive training: A job is initially given to an employee. The plan's requirements for an employee change.
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A physician orders an i.v. bolus injection of diltiazem hydrochloride for a client with uncontrolled atrial fibrillation. what should the nurse do before administering an i.v. bolus?
The nurse will administer an i.v. bolus, gently aspirate the I.V. catheter to check for the blood return.
What is atrial fibrillation?
A-fib, or atrial fibrillation, is an irregular and frequently very rapid heart rhythm (arrhythmia) that can cause heart blood clots. A-fib increases the risk of stroke, heart failure, and other heart-related problems.
AFib is mostly brought on by chaotic signals that cause the atria, the two top chambers of your heart, to contract quickly and out of time. Because of how swiftly they contract, the heart's walls fibrillate. AFib may result from electrical system damage to your heart.
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The term molecular mass can only be applied to a(n) _______compound since compounds do not consist of molecules. the correct term that is applicable to all types of compounds is mass.
The term molecular mass can only be applied to a(n) covalent compound since compounds do not consist of molecules. the correct term that is applicable to all types of compounds is mass. covalent
The molecular components of a compound offer the smallest integer ratio of the atoms withinside the compound. Different compounds may have identical molecular components. The term "molecular weight" isn't suitable while speaking about ionic compounds that aren't made from personal molecules
An atom and its ion have identical atomic mass due to the fact the mass of the electron that turns an atom into an ion is negligible. The term "molecular weight" won't be suitable due to the fact the components of an ionic compound now no longer describe the composition of an unmarried molecule.
Something like desk salt (NaCl) is a compound due to the fact it's miles made from a couple of elements (sodium and chlorine), however, the bonds that keep NaCl collectively are ionic bonds, so in a molecule There is none. Sodium chloride may be stated to be an ionic compound if desired.
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Consider the solvents that will be used as potential recrystallization solvents: water, hexane, and ethanol. which is the most polar? least polar? miscibloe?
Water is most polar solvent that is used for the process of re-crystallization and Ethanol is less polar than water . Ethanol is miscible with both water and hexane.
Water acts as a polar solvent because it can attracted to either the positive or negative electrical charge on the solute .Hence, water is most polar solvent. Ethanol is less polar to water but very polar molecule due hydroxy group, which forms hydrogen bond with other molecules.Hexane is a non polar compound.
The two liquids that mix completely together are called as miscible liquids.Ethanol is miscible with water and hexane both.water and ethanol both are the pair of miscible liquids because ethanol and water can mix together completely and we get a clear colorless liquid.ethanol can mixed in water in any proportion without any limit.
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Approximately how much heat in kj was released from the combustion of the 1-g sample?
Approximately, 21 kJ was released from the combustion of the 1-g sample.
Define Heat. What is the SI unit of Heat?Because heat is a type of energy, the SI unit for heat is also joules (J), which is defined as the quantity of energy required to increase the temperature of a given mass by one degree. This is significant because heat is a form of energy. Heat is the result of the movement of kinetic energy within a material or an item, or from an energy source to a material or an object. Radiation, conduction, and convection are the three mechanisms through which such energy can be transferred. The joule is the S.I. unit for heat.
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Water molecules are held together by hydrogen bonds because they are ___ molecules
Water molecules are held together by hydrogen bonds because they are polar covalent bond molecules.
The smallest particle of a substance has all the physical and chemical properties of that substance. A molecule is made up of one or more atoms. If they contain multiple atoms, those atoms can be the same (the oxygen molecule has two oxygen atoms) or different (the water molecule has two hydrogen atoms and one oxygen atom). Biomolecules such as proteins and DNA are made up of thousands of atoms.
A simple molecule contains only a few atoms joined by covalent bonds. An example is carbon dioxide (CO 2 ), whose molecule contains a carbon atom bonded to two oxygen atoms.
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1. how common are the elements that living systems are made out of?
2. explain the relationship between matter and energy.
3. why do atoms bond?
Living systems are made out of - phosphorus, sulphur and carbon.
Matter itself has energy and matter can be converted to energy and vice versa.
Atoms associate with one another to strengthen the stability of their arrangement of negatively charged electrons.
Following are the answers to the questions -1. Common elements of the living organisms are - Nitrogen, oxygen, phosphorus, sulphur and carbon. These are the 6 most knowing common elements.
2. It's included more then 95% to 97% mass on a human body . Matter itself has energy and matter can be converted to energy and vice versa. The equal amount of matter can have totally different amount of energy and so show up the different type of matter.
3. Electron can be transferred one atom to another this is the most basic way that outer electron can from atom bond .
Atoms associate with one another to strengthen the stability of their arrangement of negatively charged electrons. The positively charged nucleus is surrounded by these electrons in so-called "shells," and according to quantum theory, each shell becomes stable once it has a particular amount of electrons.
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What is the atomic number of an atom that has 6 protons, 6 neutrons, and 6 electrons? quzket
The atomic number of an atom that has six protons, six neutrons, and six electrons is 6. And the element is carbon.
Carbon is known as a tetravalent compound.
It has four electrons in its outermost shell. It forms a covalent bond with other compounds.
The number of neutrons. = 6
Number of electrons = 6
Number of protons = 6
So the atomic number of the compound is,
The atomic number of an element = Number of protons present in its nucleus
The number of protons given in the compound is 6.
So the atomic number of the compound is also 6.
Carbon has six atomic numbers.
Therefore, the atomic number of an atom that has six protons, six neutrons, and six electrons is 6. And the element is carbon.
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Calculate the frequency of light that corresponds to the following wavelengths
in a vacuum.
a. 200 nm
b. 30 pm
c. 10 km
Frequency, wavelength and speed of light are connected to each other by the formula
c= f * w
where c is the speed of light
f is the frequency of light
w is the wavelength
We are required to find the frequency of light at different wavelengths as provided in the question
We would use the speed of light as 3 x 10^8 m/s
Case 1:
when the wavelength is 200 nm
a nm is a unit of the scale 10^-9m
Using the formula,
c= f *w
3 x 10^8 = f x 200 x 10^-9
f = 3 x 10^8/200 x 100^-9
= 1.5 x 10^17 Hz
Case 2:
when the wavelength is 30pm
a pm is a unit of the scale 10^-12m
c = f *w
3 x 10^8 = f x 30 x 10^-12
f = 3 x 10^8 / 30 x 10^-12
f= 10^19Hz
Case 3:
when the wavelength is 10km
a km is a unit of the scale 10^3m
c = f *w
3 x 10^ 8 = f x 10 x 10^3
f =3 x 10^8 / 10x 10^3
f = 3 x 10^4 Hz
Hence the frequencies are 1.5 x 10^17 Hz, 10^19Hz,3 x 10^4 Hz
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What diameter water pipe is required to handle 0.075 m3/s and a 500 kpa pressure drop? the pipe length is 175 m, and roughness is 2.5 mm.
The diameter water pipe is required to handle 0.075 m3/s and a 500 kpa pressure drop is 149.4mm.
The force applied perpendicularly to an object's surface, denoted by the symbol p or P, is stated to be applied per unit area that the force is claimed to be dispersed over. The pressure that is supposed to be related to the ambient pressure is called the gauge pressure, also known as gauge pressure.
[tex]Q=0.075m^3/s[/tex]
ΔP=500kPa
L=175m
e=2.5mm
Properties of water :
[tex]\rho=1000kg/m^3[/tex]
[tex]\mu=0.001N-s/m^2[/tex]
Reynold's number Re=ρVD/μ
where V= Q/A=Q/(π/4)[tex]D^2[/tex]=4Q/π[tex]D^2[/tex]
Re=(ρ(4Q/π[tex]D^2[/tex])D)/μ
=4ρQ/πDμ=4(1000kg/[tex]m^2[/tex])(0.075[tex]m^3[/tex]/s)/πD(0.001N-s/[tex]m^2[/tex])
Re=(95492.966/D)
Darcy friction formula
f=1.325/[ln(e/3.70+5.74/[tex]Re^{0.9}[/tex])[tex]]^2[/tex]
f=1.325/[ln(e/3.70+5.74/(95492.966/D[tex])^{0.9}[/tex])[tex]]^2[/tex]____(1)
from, [tex]h_L[/tex]=8fL[tex]Q^2[/tex]/g[tex]D^2[/tex][tex]\pi^2[/tex]
Δρ/ρμ=8FL[tex]Q^2[/tex]/[tex]\pi^2[/tex]g[tex]D^5[/tex]
500×[tex]10^3[/tex]Pa/(1000kg/[tex]m^3[/tex])=8f(175m)(0.075[tex]m^3[/tex]/s[tex])^2[/tex]/[tex]\pi^2[/tex][tex]D^5[/tex]
f/[tex]D^5[/tex]=626.642
f=626.642[tex]D^5[/tex]_____(2)
solving equation 1 and 2
we get f=0.0467 and D=0.1494m
D=149.4mm
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The molecular mass of glucose is 180 g. to make a 1m solution of glucose, you should _______.
The molecular mass of glucose is 180 g. To make 1 M solution of glucose , you should dissolve 1 mole of glucose in 1 litre of water.
The molecular mass of glucose is 180.16 g/mole, therefore 1 mole is 180.16 grams.
So, to make a 1 M solution, you should take 1 mole = 180.16 g of glucose and make up to 1 litre.
Working glucose solution is prepared by diluting the stock solution.
It can also be said that 1 M glucose solution is -
1 M glucose solution = 180 g / 1000 m L
= 0.18.
So, it is 0.18 % w/v.
Glucose solution is a mixture of glucose and water. It is used to treat low blood sugar and the water loss without the electrolyte loss. Glucose solution is an isosmotic solution. If it is in large amount, it produces hypertonic effects on the system.
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For a given substance that exhibits liquid-crystalline properties, the transition from solid to liquid-crystal state occurs ________.
When a substance exhibits liquid-crystalline qualities, the change from solid to liquid-crystalline state takes place at the solid's melting point.
What are liquid crystals?
The process of turning a liquid substance into a highly structured solid, with its atoms or molecules arranged in a well defined three-dimensional crystal lattice, is known as crystallisation.
A type of substance known as liquid crystal (LC) has qualities halfway between those of solid crystals and regular liquids. For instance, a liquid crystal's molecules may flow like a liquid while still having a crystal-like orientation.
Crystallized liquid. Liquid crystals are a type of substance known as liquid crystals (LCs) exhibits properties that fall somewhere between those of solid crystals and those of regular liquids. For instance, a liquid crystal's molecules may flow like a liquid while still having a crystal-like orientation.Thus, a substance exhibiting liquid-crystalline characteristics, the conversion from liquid-crystal occurs at the solid's melting point.
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A concentration gradient exists in a solution when the concentration of solutes in the solution is:________
A concentration gradient exists in a solution when the concentration of solutes in the solution is the same everywhere.
The concentration gradient of a solute is the extrude in awareness in keeping with unit distance in answer. An awareness gradient is created with the aid of using diffusion among areas with one-of-a-kind concentrations of substances. Diffusion maintains till the densities of the 2 areas are equal.
A concentration gradient is a sluggish extra de withinside the awareness of a solute in the answer as a feature of distance withinside the answer. An answer essentially includes fundamental components: a solvent (an aspect that dissolves, together with water) and a solute (debris that dissolves withinside the solvent).
The distinction in the concentration of a substance from one place to other is known as an awareness gradient. An awareness gradient happens while there's an awareness distinction (interior and outside) withinside the cell. Concentration gradients are essential for molecular migration.
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what should you be careful of when measuring the temperature of a liquid in a beaker
The precaution to be taken while measuring the temperature of a liquid in a beaker is applying proper heat balance and taking all the required precautions.
A beaker with an open top contains a sample of liquid. It exposes this sample to light. That liquid absorbs the light energy, turning it into heat energy. As a result, the liquid becomes warmer and evaporation is accelerated. As a result, there is less liquid in the beaker. Since it is well known that the surface temperature of a liquid, along with air movement above the liquid surface, is one of the dominant factors affecting evaporation, I want to measure the evaporation rate as a function of surface temperature.This can be done by applying a heat balance.Learn more about heat balance at:
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Classify each of the following as ionic or molecular, and name each: a. fepo3 b.cl2o7 c.br2 d.ca3(po4)2 e.pcl3 f.al(clo2)3
a. fepo3 - Iron phosphite - Ionic
b.cl2o7 - Chloline heptoxide - Molecule
c.br2 - Bromine - Molecule
d.ca3(po4)2 - Calcium phosphate - Ionic
e.pcl3 - Phosphorus trichloride - Molecule
f.al(clo2)3- Aluminum Chlorite - Ionic
What are ions?The term "ion" refers to an atom or molecule with a net electrical charge. The charge of an electron is typically regarded to be negative; it is equivalent to and opposes the charge of a proton, which is typically thought to be positive.
An atom or collection of atoms with an electric charge is known as an ion. Cations are the name for positive-charged ions. Anions are the name for ions that have a negative charge. The body contains several common chemicals as ions. Sodium, potassium, calcium, chloride, and bicarbonate are typical examples.
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a. fepo₃ - Iron phosphite - Ionic
b.cl₂o₇ - Chloline heptoxide - Molecule
c .br₂ - Bromine - Molecule
d.ca₃(po₄)₂ - phosphate - Ionic
e .pcl₃ - Phosphorus trichloride - Molecule
f. al(clo₂)₃- Aluminum Chlorite - Ionic
What are ions?
The term "ion" refers to an atom or molecule with a net electrical charge. The charge of an electron is usually regarded to be negative; it is equivalent to and opposes the charge of a proton, which is usually thought to be positive.
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We will now examine the patterns that exist for the ratios in which metal and nonmetal elements combine in order to learn more about patterns within this type of compound (between a metal and a nonmetal).
3. Write the formula and draw the particle diagram for each compound, given the two elements.
The ratio within each compound is given.
The right answer is given in the picture.
To find the formula of an ionic compound, first, identify the cation and write down its symbol and charge. Then identify the anion and note its sign and charge. Finally, the two ions combine to form an electrically neutral compound.
Particle diagram Elements and compounds can be represented using particle diagrams. This is a box with colored spheres drawn to represent atoms or molecules. These diagrams can represent elements and compounds and their molecular composition by the types of spheres and how they are connected. Particle diagrams are used to show particles, atoms, or molecules within matter. A diagram showing particles in a substance.
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all of the following are examples of physical properties,except
Answer: C
Explanation:
A. color.
B. boiling point.
C. flammability.
D. taste.
E. density. is this the whole question
46. how many moles are there in each sample!
a. 55.0 g ti
b. 16.9 mg na
c. 7.95 x 1024 ne atoms
d. 25 xe atoms
a. 55.0 g of ti = 0.02 moles
b. 16.9 mg of na = 0.62 moles
c. 7.95 x 1024 ne atoms = 0.4 moles
d. 25 xe atoms = 0.0037 moles
What is mole?In chemistry, the term "mole" (sometimes written "mole") refers to a standard scientific unit for measuring vast amounts of extremely small objects like atoms, molecules, or other specific particles.
The mole represents 6.02214076 × 10^23 units, an astronomically huge number. With effect from May 20, 2019, the International System of Units (SI) adopted this number as the mole definition by the General Conference on Weights and Measures.
The number of atoms found in 12 grams of carbon-12, as established scientifically, made up the definition of the mole in the past. The quantity of units in a mole is also known as Avogadro's number or Avogadro's constant in honor of the Italian physicist Amedeo Avogadro (1776–1856).
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J. j. thomson studied cathode ray particles (electrons) and was able to measure the mass/charge ratio. his results showed that?
His results showed that matter included particles much smaller than the atom.
J. J. Tomson concluded that atoms are divisible and that the corpuscles are their building blocks.
Atoms are made up of smaller particles.
J. J. Thomson discovered the electron ( the negative charges of the atom) in 1897.
His "plum pudding" model (1904) suggested: the electrons are embedded in the positive charge and evenly distributed throughout the entire atom.
With this model, he abandoned his earlier hypothesis that the atom was composed of immaterial vortices.
Later, scientist Rutherford demonstrate that J.J Thompson's Plum Pudding model was not accurate.
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