The percentage abundance of Nz- 51 and Nz- 55 are 69.8 % and 30.2% respectively.
What is the percentage abundance of the isotopes?We know that an isotope of an element has to do with atoms that have the same atomic number but the atomic masses of the atoms does differ. In this case, we have two isotopes Nz - 51 and Nz -55. We have the relative atomic mass of the elements as 52.21 amu.
Let the percentage abundance of Nz - 51 be x and the percentage abundance of Nz -55 be 1 - x.
52.21 = 51x + 55(1 - x)
52.21 = 51x + 55 - 55x
52.21 - 55 = 51x - 55x
-2.79 = -4x
x = 0.698
Thus;
Percentage abundance of Nz - 51 = 0.698 or 69.8 %
Percentage abundance of Nz - 55 = 1 - 0.698 or 30.2 %
If I have 63 atoms
Number with isotope Nz - 51 = 0.698 * 63 = 44 atoms
Number with isotope Nz - 55 = 0.302 * 63 = 19 atoms
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How would you describe the bond that exists between two oxygen atoms to make the o2 molecule? how many lone pairs are present on each individual oxygen atom?.
The bond that exists between two oxygen atoms to make the O2 molecule is described as two covalent bonds and two lone pairs of electrons are present on each individual oxygen atom.
A double bond in chemistry is a covalent bond between two atoms that involves four bonding electrons, rather than two as in a single bond.
In the oxygen molecule, O2, the oxygen atoms that make up the molecule are bonded together by sharing two pairs of electrons. Each oxygen atom has 6 valence electrons, if they share two of their valence electrons with each other, they each have 8 valence electrons.
In this way, the so-called octet rule is fulfilled, where atoms gain, lose or share electrons with other atoms to have 8 valence electrons and thus acquire a noble gas configuration.
What is an atom?The atom is the smallest part of the composition of matter, it is indivisible and is composed of a nucleus that has protons and neutrons, and around the nucleus there are the electrons.
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What is the definition of Chemical Symbol
A chemical symbol is a notation of one or two letters representing a chemical element.
What is the mole for 3.01*10 23 molecules h2o?
Answer:
8.99 g
Explanation:
Many everyday substances, such as oxygen, gold and aluminium, are elements.
Other substances such as water and sugar are not.
Explain what this means in terms of the atoms in them.
Many everyday substances, such as oxygen, gold and aluminium, are element . but Other substances such as water and sugar are not
element is the simplest pure substance that can not be broken down into any other substance on the other hand atom is the smallest particle of an element.compound is a pure substance which is made of two or more than two elements that are combined chemically in a fixed ratio.so, from the above discussion we concluded that H2O and C12H22O11 are compound because these do not have single type of atom rather they consititute a fixed proportion of more than one elements.but oxygen written as O2aluminium written as Algold written as Au so, all of these have single type of atoms, so known as element .To know more about element visit :
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You do not have to begin a measurement with the liquid level at 0. 00 ml in the buret. True or false?.
Explanation:
Fill the buret with the liquid you wish to deliver and read the volume. It is not necessary to adjust the level of the liquid to exactly 0.00 ml
Which statement best describes a scatterplot?
A. it shows data as a percentage of a whole
B. it shows data points connected by a single line
C. it shows quantitative data that relate two variables
D. it shows qualitative data grouped by similarities
The statement that best describes a scatterplot is as follows: it shows quantitative data that relate two variables (option C).
What is a scatter plot?A scatter plot is a graphical representation of data that showcases the relationship between two different variables.
A scatter plot is usually plotted or displayed on a cartesian plane made up of two axes. The X-axis runs form left to right and usually shows the range of values of an independent variable.
The y-axis runs from top to bottom and usually shows the range of values of variable dependent on one other variable.
Therefore, it can be said that a scatter plot can best be described as one that shows quantitative data that relate two variables.
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If you were to do a 50% serial dilution, starting with a 10% concentration, how many dilutions would you have to make before getting to 2. 5% as your final concentration?.
The number of dilutions required to reach 2.5% as the final concentration would be 2.
Any dilution in which the concentration is reduced by the same amount in each subsequent stage is referred to as a serial dilution.
In serial dilutions, the original volume divided by the final amount is known as the dilution factor.
[tex]DF = \frac{V_i}{V_f}[/tex]
Now we are given that we must do 50% serial dilution, which indicates that the concentration must be reduced to half of its starting value after each dilution.
∴ [tex]DF=\frac{10}{50}[/tex] × [tex]100[/tex]
DF = 2
This indicates that starting with a 10% concentration, a single dilution would result in a 5% concentration. And again diluting this 5% concentration would result in a 2.5% concentration.
Hence, the number of dilutions required to reach 2.5% as the final concentration would be 2.
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. Formic acid is a weak acid found in insect stings. It partially dissociates in water according to the reaction HCHO2 reversible reaction arrow CHO2– + H+. The equilibrium constant describing the dissociation is Ka = . (6 points)
i. If a solution of formic acid contains 0.2 M HCHO2, 0.006 M CHO2–, and 0.006 M H+, what is the Ka of the acid? (4 points)
ii. What is the pH of the solution at the concentrations given? (4 points)
iii. What would happen to the equilibrium position if more CHO2– were added to the solution? (4 points)
From the data in the question, we obtain the following;
Ka = 1.8 * 10^-4 pH = 2.22If more [tex]CHO_{2} ^-[/tex] were added to the solution, the equilibrium position would shift to the left hand side.What is the Ka?The term Ka is the acid dissociation constant. It shows the extent to which an acid is dissociated in solution. We know that the acids that dissociate completely in solution are called strong acids.
In this case;
[tex]HCHO_{2}[/tex](aq) ⇔ [tex]CHO_{2} ^-[/tex](aq) + [tex]H^+[/tex](aq)
Hence;
[[tex]HCHO_{2}[/tex]] = 0.2 M
[[tex]CHO_{2} ^-[/tex]] = 0.006 M
[ [tex]H^+[/tex]] = 0.006 M
Ka = [ [tex]H^+[/tex]] * [[tex]CHO_{2} ^-[/tex]]/[[tex]HCHO_{2}[/tex]]
Ka = (0.006)^2/(0.2)
Ka = 1.8 * 10^-4
The pH of the solution = -log(0.006) = 2.22
If more [tex]CHO_{2} ^-[/tex] were added to the solution, the equilibrium position would shift to the left hand side.
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atoms contain a combination of protons, neutrons, and electrons which gives an atom its properties and makes it possible to predict their reactivity, including which ion(s) will form from that element. of protons, neutrons, and electrons, which one(s) are found in the nucleus and which one(s) are found outside the nucleus
Due to electron shielding, which occurs when more electrons are introduced at the same energy level as the outermost electron, this is the case.
It is feasible to anticipate an atom’s reactivity, including which ion(s) will form from that element, thanks to the protons, neutrons, and electrons that give an atom its unique features.
What is the name for the particle formation of protons and neutrons?Since they are found in the atom’s nucleus, protons and neutrons are referred to as nucleons jointly.
How do protons, neutrons, and electrons affect an atom’s characteristics?The mass number of the chemical element will be determined in part by the number of protons and neutrons. The quantity of electrons present will depend on the number of protons.
The chemical will be determined by this electron.
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atoms contain protons, neutrons and electrons.
a lithium atom has the symbol 7/3Li
Explain in terms of sub-atomic particles, why the mass number of this lithium atom is 7?
Sub atomic particles are those particles which have the size smaller that the size of an atom. these are neutrons, electron and protons.
Mass number = neutrons + protons so in lithium 3+4=7
The number of protons present in an element is known as atomic number. This is denoted as Z. Different atom have different atomic number because they have different number of protons.
The sum of protons and neutrons give us the mass number. This is denoted as A. The weight of the of the electron can be neglected so atomic mass is almost equal to mass number.
In case of lithium its nucleus consist of 3 protons and 4 neutrons so mass number = neutrons + protons ,3+4=7.
⁷₃Li this is the symbolic representation where above number is mass number and below number is the atomic number.
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in a synthesis, the temperature inside the reaction flask is called the reflux temperature. what would be the internal reaction temperature in the diels alder reaction studied today?
The internal reaction temperature would be constant temperature in the Diels alder reactions, The temperature would be 25 ° C to 100° C.
Diels alder reaction : This reaction is used to make the chemical more stable. This reaction is used to synthesis of different materials such as plastics and rubber.
It is an exothermic reaction.
Xylene is used to faster the chemical reaction in the given process.
The product would be cyclohexane.
MP of the reaction is 84 °C to 114 ° C.
It is also a electrocyclic reaction.
In past it uses temperature around 200°C.
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In rutherford's famous experiment, he shot heavy, fast moving, positive alpha particles at a thin gold foil. based on thomson's plum pudding model of the atom, what did rutherford expect to happen, and why? all the alpha particles would be deflected by the foil because of the even distribution of mass and charge throughout the atom. all the alpha particles would pass straight through the foil because of the even distribution of mass and charge throughout the atom. most of the alpha particles would become embedded in the foil because they are attracted to the negative electrons in the atom. some of the alpha particles would be deflected and some would pass through, because of the negative charge of the electron cloud.
Based on Thomson's plum pudding model of the atom, what did Rutherford expect All the alpha particles would pass straight through the foil because of the even distribution of mass and charge throughout the atom.
What happened when Rutherford fired alpha particles at gold foil?Alpha particles, which have a positive charge, were fired at a piece of gold foil. The vast majority of alpha particles passed right through. This demonstrated that the gold atoms were primarily empty space.The gold foil experiment by Rutherford demonstrated that the atom is mostly empty space with a tiny, dense, positively charged nucleus. Rutherford proposed the nuclear model of the atom based on these findings.With his gold-foil experiment, physicist Ernest Rutherford established the nuclear theory of the atom. When he fired an alpha particle beam at a sheet of gold foil, some of the particles were deflected. He concluded that the deflections were caused by a tiny, dense nucleus.The nucleus of an atom is very small. There is a lot of empty space surrounding the nucleus. The nucleus is a very small positively charged region that contains the entire mass of an atom. Electrons are dispersed in the empty space surrounding the nucleus.
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suppose you sketch a model of an atom using the ones here as a guide. how would you build a model that is ionized? how would you build a model that is
An atom is mainly constructed of a total of three different particles known as electrons, protons and neutrons.
An atom is neutrally charged because the charge/number of the electrons (negative charge) is equal to the charge/number that the proton carries (positive charge). these charges cancel out each other making the atom neutrally charged.
Model of an ionized atomAn ionized atom is called as the one which has some net charge present on it. This charge on it can be either a positive charge or a negative charge.
Model of radioactive atomA radioactive atom is an atom that is an unstable atom and has access of energy in its center. This radio activeness can be caused by adding either neutrons or protons.
To Model a radioactive atom, increase the number neutron or proton present in the nucleus.
Hence, through this we can conclude that to model an ionized atom is done by adding or removing electron(s) from the atom while to model a radioactive atom we add additional Neutron or proton to the nucleus.
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a 6.57-g sample of niso4•6h2o (molar mass 262.84) is dissolved in enough water to make 50.00 ml of a green solution, and 7.15 g of na2co3•10h2o (molar mass 286.14) is dissolved in enough water to make 50.00 ml of a colorless solution. the two solutions are mixed, and a green precipitate forms. the resulting slurry is divided into two equal portions. to one portion is added an excess of 6 m hcl, which results in the disappearance of the precipitate and a rapid evolution of a gas. to the second portion is added a few milliliters of 6 m nh3. the precipitate dissolves, and a blue solution forms.
When the solution are mixed together, the gas that evolved must be Carbon dioxide.
There are two reactions:
When nickel sulphate reacts with sodium sulphate which gives nickel carbonate with sodium sulphate.
1) NiSO₄ (aq) + Na₂SO₄ (aq) = NiCO₃ (s) + Na₂SO₄
The resultant is a green solid.
When the resulting slurry i.e. the nickel carbonate reacts with hydrochloride, gives nickel chloride, carbon dioxide and water, and also the disappearance of the precipitate.
2) NiCO₃ (s) + 2 HCl (aq) = NiCl₂ + CO₂ + H₂O
When the evolved gas is added to NH₃ solution it dissolves the precipitate and forms a blue solution which gives the confirmation that the gas so evolved is carbon-di-oxide.
The given question was incomplete, complete question is:
"A class is given a demonstration of solution chemistry and solubility equilibria.Passage: A 6.57-g sample of NiSO₄•6H₂O (molar mass 262.84) is dissolved in enough water to make 50.00 mL of a green solution, and 7.15 g of Na₂CO₃•10H₂O (molar mass 286.14) is dissolved in enough water to make 50.00 mL of a colorless solution. The two solutions are mixed, and a green precipitate forms. The resulting slurry is divided into two equal portions. To one portion is added an excess of 6 M HCl, which results in the disappearance of the precipitate and a rapid evolution of a gas. To the second portion is added a few milliliters of 6 M NH₃. The precipitate dissolves, and a blue solution forms.Question: According to the information in the passage, the gas that evolves is:
A) sulfur dioxide. B) sulfur trioxide.
C) carbon dioxide. D) carbon monoxide".
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Why is an acid able to produce ions in aqueous solution? assume that the general formula of an acid is given by ha, where a is usually a halogen or oxygen atom.
An acid is able to produce ions in the aqueous solution because polar H-A bond break due to the attraction between H atoms and the O atoms of water.
When an acid is added to an aqueous solution, it produces hydrogen ions along with a conjugate base.
After dissolving in water, an acid splits up to form hydrogen ions or H+ ions which reacts with water molecules to form hydronium ions i.e. H3O+. The general formula of an acid shows that is is composed of a halogen atom, oxygen atom and hydrogen atoms.
Let's take this, the dissociation of HNO3 produces h+ ions and NO3- ions in water.
HNO3 ⇄ H+ + NO3-
These ions are responsible for electricity conduction. In the absence of water acids can not dissociate.
To put it simply, acids donate h+ ions only when they are added to water.
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How many moles of calcium ions, nitrate ions, and oxygen atoms are present in 0.502 mol of calcium nitrate? calcium ions 66.3 incorrect: your answer is incorrect. mol nitrate ions mol oxygen atoms mol
No. of moles present in 0.502 mol of calcium nitrate
Calcium ions = 0.502 mol,
nitrate ions= 1.004 mol,
oxygen atoms =3.012 mol.
What is calcium nitrate?The chemical composition Ca(NO3)2(H2O)x is calcium nitrate, an inorganic substance. Rarely occurring anhydrous chemical converts to tetrahydrate by absorbing moisture from the atmosphere. Colorless salts can exist in both anhydrous and hydrated forms.
Although there are additional uses for calcium nitrate, it is most frequently employed as a component in fertilizers. When manure hits concrete or limestone in a dry environment, such as a stable or cavern, nitrocalcite, a mineral that is hydrated calcium nitrate, forms as an efflorescence.
The related compounds calcium ammonium nitrate decahydrate and calcium potassium nitrate decahydrate are just two examples.
Calcium nitrate Ca(NO3)2 = 0.502 mol
Required equation of the given question is below:
Ca(NO3)2 —-> 2N03- + Ca2+
Which contains 2 nitrate ions per mole of Ca(NO3)2.,
1 calcium ion per mole of Ca(NO3)2.,
6 oxygen atoms per mole of Ca(NO3)2.
Calcium ions therefore = 0.502 mol,
nitrate ions = 2 x 0.502 mol = 1.004 mol
oxygen atoms = 6 x 0.502 mol = 3.012 mol
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help!! 30 points! will give brainlist!
Answer:
Acid base acid base
Explanation:
describe the main factors that led to a boom in the human population size in the last 300 years
How many protons, neutrons, and electrons are there?
Answer:
60 electrons and 62 protons
Explanation:
62 is the
mass number and proton number its plus 2 charge so it has to be 60 electrons
A chemistry student is investigating how particle size
affects the rate of dissolving. In her experiment, she
adds a sugar cube, sugar crystals, or crushed sugar to
each of three beakers of water, stirs the mixtures for
10 seconds, and records how long it takes the sugar to
dissolve in each beaker.
A solute in a gaseous, liquid, or solid phase dissolves in a solvent to create a solution through the process of dissolution.
what is dissolution?A solute in a gaseous, liquid, or solid phase dissolves in a solvent to create a solution through the process of dissolution.Dissolving can be demonstrated by stirring sugar into water. The solvent is water, and the solute is sugar. An illustration of the dissolution of an ionic chemical is the dissolving of salt in water. When combined with water, sodium chloride (salt) separates into sodium and chloride ions.Small particles have a higher interfacial solubility because the disjoining pressure of small particles is higher than that of large particles. Small particles dissolve more quickly because of their higher differential concentration, thinner diffusion layer, and larger surface area. So crushed sugar dissolve more quickly.To learn more about : dissolution
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PLS HELP IVE BEEN STUCK ON THIS FOR SO LONG
v
HELP PLS ITS IMPORTANT
Calculate the heat in kJ required to change 10.0 g of water at 20.0°C into steam at 120.0°C. The specific heat of ice, water and steam is 2.108 J/g*°C, 4.18 J/g*°C, 2.010 J/g*°C respectively. Hf for H2O = 334 J/g, Hv for H2O = 2260 J/g.
The total heat added is obtained as 26.36 kJ.
What is the heat required?We know that heat is the form of energy that exists due to the temperature difference between two bodies. Now when we heat water, we add heat to the water and the effect is that the temperature of the water would begin to rise and this owes to the heat that we have added to the water.
We know from the question that;
Mass of water = 10.0 g
Specific Heat capacity of liquid water = 4.18 J/g*°C
Specific Heat capacity of steam = 2.108 J/g*°C
Heat of vaporization of water = 2260 J/g
H = (10 * 4.18 * (100 - 20)) + (10 * 2260) + (10 * 2.108 * (120 - 100))
H = 3344 + 22600 + 421.6
H = 26.36 kJ
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the student determines the mass of the agcl precipitate to be 5.48 g. on the basis of this information, calculate each of the following. (i) the number of moles of mgcl2 in the original mixture (ii) the percent by mass of mgcl2 in the original mixture
What is Gravimetric analysis?
Gravimetric analysis difficulties are basically stoichiometry problems with a few extra stages. It is a class of lab techniques to determine the concentration of a solution by measuring the mass of a precipitate formed. To find moles of solute use grams of precipitate and to find concentration divide by volume.
To calculate moles of precipitate:Moles = mass / molar mass
To calculate mass of analyte:mass moles × molar mass
To calculate percent by mass of analyte in sample:(mass analyte/ mass sample) × 100
Solution:
Given:
Mass of AgCl= 5.48 g
1) Molar mass of AgCl = 143.42 g/mol
Number of moles of AgCl = 5.48 g AgCl/143.32 AgCl = 0.0382 mol AgCl
Number of moles of MgCl₂ = 0.0382 mol AgCl × (1 mol Cl/1 mol AgCl )× (1 mol MgCl₂/2 mol Cl ) = 0.0191 mol MgCl₂
2) Mass of MgCl₂ = 0.0191 mol MgCl₂ × (95.20 g MgCl₂ / 1 mol MgCl₂)
=1.82 g MgCl₂
Percent by mass = ( 1.82 g MgCl₂/ 2.94 g sample) × 100% = 61.9% MgCl₂ by mass
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25 cm³ of 0.1 mol/dm³ hydrochloric acid exactly neutralise 20 cm³ of aqueous sodium hydroxide.
The equation for this reaction is:
NaOH + HCI →→ NaCl + H₂O
What is the concentration of the sodium hydroxide solution?
The concept molarity is an important method which is used to calculate the concentration of a solution. Here molarity - volume relation is used to find out the concentration of the sodium hydroxide solution.
The term molarity is defined as the number of moles of the solute present per lite of the solution. It is represented as 'M' and it is expressed in the unit mol / L.
The equation connecting molarity and volume is:
M₁V₁ = M₂V₂
M₂ = M₁V₁ / V₂
0.1 × 25 / 20 = 0.125 cm³
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Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has twice as much.
Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has twice the mass.
mass is the amount of matter present in a particle.
unit of mass is kg.
weight is the force acting on the particle due to the gravity of the earth.
unit of weight is N.
let 1 kg block has mass x
then 2 kg block will have 2x mass
we can say that it has twice mass.
Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has twice mass
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8. Blood circulation in warm-blooded
animals is an example of ___
Answer:
dogs, lions, cats, and raccoons.
Something that causes an object to move
With this information, we now need to calculate the volume in milliliters. We need to know how many mls a drop of oleic acid occupies using the density of 0. 895 g/ml and the number of drops of oleic acid solution used.
According to the density, there are m/0.895 milliliters in a drop of oleic acid and the total drop is 0.895/m of total volumes.
We need to know about the density to solve this problem. Density is a unit that measures how dense an object is. Density can be measured by dividing mass by volume. It can be written as
ρ = m / V
where ρ is density, m is mass and V is volume
From the question above, we know that
ρ = 0.895 g/mL
Assume that 1 drop of oleic acid is m gram. Hence,
ρ = m / Vdrop
0.895 = m / Vdrop
Vdrop = m/0.895 mL
Find the total drops
V = Vdrop x n
n = V / Vdrop
n = V / (m/0.895)
n = 0.895/m of total volumes
in a drop, there is m/0.895 mililiters of oleic acid and the total drop is 0.895/m of total volumes.
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Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has twice as much.
Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has twice the mass.
Mass is the amount of matter present in the particle.
it is expressed in kg.
weight is the force acting on the particle due to the gravity of the earth.
It is expressed in newton N.
let in 1 kg block the mass present is x.
so in a 2 kg block, the mass will be 2x.
we can say that mass becomes twice.
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guess what!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
Your friend got a life or its a happy moment for you
Explanation: