A hypothetical element has three isotopes with the mass of 88, 89, and 91 amu. the natural abundance of the isotopes for this element is 80 %, 15 %, and 5 %, respectively. the molecular weight of the element is 88.3 amu.
The mass M1 = 88 amu
the mass M2 = 89 amu
the amu M3 =91 amu
the 1st isotopes abundance = 80 % = 80 / 100 = 0.8
the 2nd isotopes abundance = 15 % = 15 / 100 = 0.15
the 3rd isotopes abundance = 5 % = 5 / 100 = 0.05
the average molecular weight = 88× 0.8 + 89 × 0.15 + 91 × 0.05
= 70.4 + 13.35 + 4.55
= 88.3 amu
The molecular weight of the element = 88.3 amu.
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Perform the following mathematical operation, and report the answer to the correct number of significant figures. 0.97584 ÷ 5.68 = [?]
Answer: 0.172
Explanation:
what should the charge of a sulfide ion (s2- )be in order for it to have the same electron configuration as that of neutral phosphorus in the ground state?
The +1 charged sulfide ion has the same electron configuration as neutral phosphorus in the ground state. In formula S, sulfur dioxide is the inorganic anion of sulfur.
Below is the electron configuration of ground-state neutral phosphorus with atomic number 15.
Phosphorus-15: 1s, 2s, 2p, 6, 3s, 2p
The electron configuration of sulfur at atomic number 16 follows again.
S-16: 1s, 2s, 2p, 6, 3s, 2p, 4.
A sulfide ion has a negative charge because it contains more electrons than normal. Due to more electrons than protons, an anion has a negative charge in it. Sulfate is an anion because its overall charge is negative. any atom or group of atoms that bears one or more positive or negative electrical charges. Positively charged ions are called cations negatively charged ions are anions.
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in the titration of 79.0 ml of 0.400 m hcooh with 0.150 m lioh, how many ml of lioh are required to reach the equivalence point?
203 ml of LiOH are required to reach the equivalence point.
Titration is a commonplace laboratory technique of quantitative chemical analysis to decide the attention of a recognized analyte. A reagent, termed the titrant or titrator, is prepared as a standard answer of known attention and extent.
76 ml, 0.400 M HCOOH
Number of moles(HCOOH) = (76 × 0.4)
= 30.4 m mol
Reaction equation:-
HCOOH + 4OH ---------> HCOOLi + H₂O
∵ Molar Ratio = 1:1
Hence, the Moles required of LiOH to reach the equivalence point = 30.4 m mole
Volume (LiOH) = moles / molarity = 30.4/0.150
= 30.4 × 10⁻³ /0.150
= 203 ml.
Titration is the sluggish addition of one solution of an acknowledged concentration to a regarded quantity of any other answer of an unknown awareness till the reaction reaches neutralization, which is frequently indicated through a shade alternate.
The motive of the titration is the detection of the equivalence point, the factor at which chemically equal quantities of the reactants had been mixed. the quantity of reactants that have been blended at the equivalence point relies upon the stoichiometry of the reaction.
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calculate the mass of gold that occupies the same volume as 62.9 g of cobalt. the density of cobalt is 8.90 g/ml and the density of gold is 19.3 g/ml
By using the formula of a density, the mass of a gold that occupies the same volume as 62.9 g of cobalt is
The density of a substance is calculated using the formula
density=mass/volume
By using density and mass, find out the volume in cobalt and use the same volume to find mass of gold. Rearrange the formula of density for volume
volume=mass/density
Plug values of cobalt in the formula
volume = (62.9 g×ml/8.90 g)
volume = 7.0674 ml
Now rearrange the formula of density for mass to calculate the mass of a gold
mass=density×volume
Plug values of gold in the formula
mass = 7.0674 ml×(19.3 g/ml)
mass = 136.40 g≈136 g
Therefore, the mass of gold occupies the same volume is 136 g.
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Calcium carbonate can be broken down by heating. What is the scientific term for this?.
The term is called Thermal Decomposition. Calcium Carbonate is strongly heated until it undergoes thermal decomposition to form calcium oxide and carbon dioxide. The calcium oxide (unslaked lime) is dissolved in water to form calcium). Bubbling carbon dioxide through these forms a milky suspension of calcium carbonate.
Thermal decomposition is a chemical reaction where heat is a reactant. Since heat is a reactant, theses reactions are endothermic meaning that the reaction requires thermal energy to break the chemical bonds in the molecule.
A common example of thermal decomposition reaction is calcium carbonate decomposes into calcium oxide and carbon dioxide. This process is employed in the manufacturing of quick lime, which is an important substance in many industries.
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Which of the following 10-g samples of a radio-isotope will decay to the greatest extent in 28 days? Show all work and explanation
A. P-32
B. Kr-85
C. Fr-220
D. I-131
The radioisotope that would decay the most ought to be Fr-220. Option C
What is the half life?The term half life of the radioactive isotope has to do with the time that it would take for us to have only half of the number of the original radioactive atoms to be left. We have to find the half life of each of the isotopes so that we can be able to get the one that has decayed the most.
For P - 32
Half life = 14.3 days
Using;
N/No = (1/2)^t/[tex]t_{\frac{1}{2} }[/tex]
N = amount present at time t
No = initial amount
t = time taken
[tex]t_{\frac{1}{2} }[/tex] = half life
Hence;
N/10 = (1/2)^28/14.3
N = (1/2)^28/14.3 * 10
N = 2.6 g
For Kr-85
Half life 10.76 years or 3927.4 days
N/10 = (1/2)^3927.4/28
N = (1/2)^3927.4/28 * 10
N = 5.97 * 10^-47 g
For Fr-220;
27.40 seconds or 0.00032 days
N/10 = (1/2)^0.00032 days/28 days
N = (1/2)^0.00032 days/28 days * 10
N = 10 g
For I-131
Half life = 8 days
N/10 = (1/2)^8/28
N = (1/2)^8/28 * 10
N = 8.2 g
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What are the electron and molecular geometries, respectively, for hydrogen sulfide, h2s?.
Since there are four groups encircling the sulphur atom, the electron geometry is tetrahedral ( 2 lone pairs and 2 hydrogens). Due to the lone pair repulsion of the S-H bonds, the hydrogen sulfide's molecular geometry is bent, something I hadn't encountered in university. As a result, the angle will be much less than 109.5 degrees, or roughly 92 degrees.
The difference between molecular and electronic geometry is that the latter is the geometry of the localised electron densities, whilst the former simply considers the bound substituents around the sulphur, such as the hydrogens ( bonds and lone pairs).
Four of the five geometries linear, trigonal planar, tetrahedral, trigonal bipyramidal, and octahedral are referred to as electron group geometries. The form of the molecule is changed but the electron geometry remains the same if one or more of the bonding pairs of electrons are swapped out for a lone pair.
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in a double replacement reaction, the anion of one reactant must be combined with the of the other reactant.
Opposing ions join in a double displacement reaction, also known as a double replacement reaction. This implies that the cation of one chemical will join with the anion of another molecule and form a bond, and vice versa.
What is a displacement reaction, exactly?A displacement reaction is a kind of reaction where a portion of one reactor is replaced by another. A displacement reaction is also sometimes called a substitution reaction or a metathesis reaction.
What causes a displacement response to happen?When one element replaces another in a compound, it causes a single displacement reaction. Neither metal nor a nonmetal may be used as a substitute for another metal. Only a more reactive component of the chemical it reacts with can take the place of the other component.
Give an example of double displacement.A precipitation reaction occurs between two aqueous ionic compounds to create a new, insoluble ionic compound. Here is an illustration of a reaction between lead (II) nitrate and potassium iodide that produces (soluble) potassium nitrate and (insoluble) lead iodide.
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how much heavier is a magnesium atom than helium atom
Answer:
6
Explanation:
Magnesium=24
helium= 4
24:4=6
Give two everyday examples of the thermal energy of a substance being increased.
The two everyday examples of the thermal energy of a substance being increased are the temperature rising of the sun and cooking.
What is thermal energy?Thermal energy is defined as the type of energy that causes the movement between f molecules within an enclosed system or environment. When this energy flows through the system it is referred to as heat.
In our daily activities, there are examples of objects that shows rise in their thermal energy. They include the following:
The sun: The temperature of the rise of the sun cannot be compared with that of the Noonday as it gets hooter with time.Cooking: There is a change in thermal energy while cooking due to conduction, convection and radiation.Learn more about thermal energy here:
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What are 3 examples of exponential growth?.
Three instances of exponential growth are the spread of viruses, the financial sector, and nuclear chain reactions.
What is the position of Einstein on exponential growth?It ought to, given how challenging it is for the average mind to comprehend exponential development (also referred as compound growth). But the key to effective investing is understanding it. The eighth miracle of the world, according to Albert Einstein, is compound interest.
What elements contribute to exponential growth?A population will expand exponentially if given unlimited resources, including food, water, land if necessary, moisture, carbon, and other natural elements. As a population expands, exponential expansion occurs, substantially accelerating the growth rate.
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How can temperature lead to weathering of rocks? (1 point)
Responses
A.Rocks become ice when they get cold, which can later melt and wash away.
B.Rocks expand and contract when they are heated and cooled which cause them to break.
C.Rocks can melt when they become hot, which can lead to pieces breaking off.
D.Rocks move faster when they are heated, which can cause the pieces to eventually move away.
Which part of Earth experiences physical weathering? (1 point)
Responses
A.outer core
B.mantle
C.inner core
D.crust
Which is the last stage of physical weathering in rocks? (1 point)
Responses
A.sand
B.pebble
C.rock
D.boulder
What must be present on a rock that undergoes frost wedging?(1 point)
Responses
A.sharp edges
B.a crack
C.round shape
D.holes around it
ANSWER ALL CORRECTLY PLEASEEE
A. Temperature leads to weathering of rocks as rocks expand and contract when they are heated and cooled which causes them to break; option B is correct.
B. The part of the Earth that experiences physical weathering is the crust; option D is correct.
C. The last stage of physical weathering in rocks is sand; option A is correct
D. A crack must be present on a rock that undergoes frost wedging; option B is correct.
What is physical weathering?Physical weathering is a form of rock weathering in which large rocks are broken down into smaller rock particles without a change occurring in the chemical composition of the rocks.
Agents of physical weathering include wind, water, ice, and heat.
Some forms of physical weathering include:
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A student is studying barium, a highly reactive element that is used in some paints. Which characteristic of barium is most closely related to its chemical reactivity?.
High ionization energy is the property of barium that is most directly connected to its chemical reactivity.
Has barium a high level of reactivity?Each of their atoms contains two valence (outermost) electrons. Barium has valence electrons in its fifth shell because it is in period 5, or row 5, however it can lose its valence electrons very quickly.
This explains why oxygen and other electronegative substances, like barium, make it so reactive. In a nutshell, when atom size increases, the ionization energy drops.
Barium is larger and has higher energy levels than strontium because it is in a different period—the sixth—than strontium, which is in a different period. As a result, barium will have a lower ionization energy.
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Besides nylon, what other product is formed from the reaction of adipoyl chloride and 1,6-diaminohexane?.
Besides nylon, HCl is formed from the reaction of adipoyl chloride and 1,6- diaminohexane , but HCl is the byproduct molecule.
What is formed when adipoyl chloride and 1,6-diaminohexane reacts with each other and what are the by products?Adipoyl chloride is the monomer and hexamethylinediamine is also the monomer which reacts together to form polymer.The polymer formed is named nylon6,6 which is a co polymer and nylon 6,6 find its use in various other activities of life.Nylon6,6 is a copolymer since the participation of two monomers , and not a single monomer undergoing decomposition.Nylon6,6 is formed with an elimination of small molecule of HCl which is considered to be a by product .It is formed by a condensation reaction and hence HCl is the product formed from the reaction of adipoyl chloride and 1,6- diaminohexane.To know more about nylon visit:
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assuming all of these samples of gas are at the same temperature, which will escape through a hole in a balloon at the lowest rate?
Since carbon dioxide has the highest molecule mask, we will thus state that the rate of refuge in will be the slowest for this gas. So, based on the choices, we can conclude that option C is the right response.
According to Charles' law, when the pressure is held constant, the volume of a given amount of gas is precisely proportional to its kelvin-scale temperature. The balloon's volume grows as the temperature rises. In reality, assuming pressure is constant, they are proportionate to one another. However, there is a catch: you need to utilize what is known as absolute temperature in order to do computations. The balloon's volume grows as the temperature rises.
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what is 2 times 34528
Write the balanced neutralization reaction that occurs between h2so4 and koh in aqueous solution.
The balanced neutralization reaction that occurs between H2SO4 and KOH in aqueous solution is;
H2SO4 (aq) + 2KOH (aq) --> 2H2O (l) + K2SO4 (aq)
Neutralization reaction
We refer to this kind of reaction, in which an acid and a base combine to produce water and salt, as a neutralization reaction. In this instance, our base is potassium hydroxide (KOH), and our acid is sulfuric acid (H2SO4) (KOH).
Acid and base leads to water and salt.
Double-replacement reaction
The H+ from the H2SO4 will attach to the OH- from the KOH in this double replacement reaction, resulting in the formation of H2O. (water). Similar to this, K+ will bind to SO42- to form K2SO4 salt.
For example, sodium hydroxide (NaOH) and hydrochloric acid (HCl) can be combined to create a salt, sodium chloride (NaCl), and water (H2O). NaOH + HCl → NaCl + H2O is the chemical formula for the neutralization reaction.
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if you have 172 grams of chromium (IIl) carbonate, how many moles do you have? About how many molecules do you have?
The moles in 172 grams of Chromium (IIl) carbonate is 0,6056 moles and there is 3.647x [tex]10^{23}[/tex] molecules.
The moles can be calculated as follows:
The first you should calculate the molar mass
Chromium (IIl) carbonate is Cr2(CO)3
Mass of Chromium = 51.9961 g/mol
Mass of Carbon = 12.0107 g/mol
Mass of Oxygen = 15.9994 g/mol
mass molar = (51.9961 g/mol x2)+(12.0107 g/mol x 3) +(15.9994 g/mol x9) = 284.0189 g/mol
The next step is calculate the moles
Divide the mass of chromium(III) carbonate by its molar mass to get moles
[tex]\frac{172 grams}{284.0189g/mol}[/tex] [tex]\\[/tex]
= 0.6056 moles
The next step is calculate the molecules
time the moles of chromium(III) carbonate by Avogadro's number
molecules= moles x Avogadro's number
molecules = 0.6056 moles x 6.02214076 × [tex]10^{23}[/tex][tex]mol^{-1}[/tex].
molecules= 3.6470 molecules
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what happens when the molecule-to-molecule attractions in the solute are comparable to those in the solvent?
The solute can have infinite solubility in the solvent when the molecule-to-molecule attractions in the solute are comparable to those in the solvent. The correct option to this question is B
On the basis of the concept, solute has a lower tendency to dissolve in water the stronger the interactions between the solute particles. Likewise, there is a greater chance that solubility will rise the stronger the interactions between the molecules of the solute and the solvent.
Water molecules cluster together as a result of stronger water hydrogen bonds, making them unavailable for biomolecular hydration. If the hydrogen bonds between the proteins significantly strengthen or weaken, the extended denatured forms of the proteins typically become more soluble in water.
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Complete question:
What happens when the molecule-to-molecule attractions in the solute are comparable to those in the solvent?
A) The solute does not dissolve in the solvent.
B) The solute can have infinite solubility in the solvent.
C) The material has only limited solubility in the solvent.
D) The solution will become saturated.
What volume of water would you add to 15. 0 ml of 12 m hcl to make it to 6. 0 m solution?.
According to molar concentration, 30 ml of water should be added to 15 ml of 12 M HCl to make it to 6 M solution.
What is molar concentration?
Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.
In the given example,volume required is calculated as, V₂=M₁V₁/M₂
V₂=12×15/6
V₂=30 ml.
Thus, 30 ml of water is added to 15 ml of 12 M HCl to make it to 6 M solution.
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if 4 ml of 0.0259 m cuso4 is diluted to 10,.0 ml with pure water, what is the molarity of copper ii sulfate in the diluted solution?
The molarity of copper II sulphate in the diluted solution would be 7.14 x 10^-3 M , if 4 ml of 0.0259 m cuso4 is diluted to 10 ml with pure water.
What is molarity and how the molarity of the diluted solution comes out to be 7.14x 10^-3 M?Molarity is the measure of number of moles dissolved in per liter of the solution of a given solution.The unit of molarity is g/L , but it depends on the units on mass and volume given in the question also.First we will calculate the number of moles : 4 ml x 1/1000x 0.0259 /1 = 1 x 10^-4 moles.The number of moles calculated out to be 1 x 10 ^-4 moles of copper sulphate , with which we will calculate the molarity.[CuSO4]= 1 x 10^-4 mol cuso4/ 0.014 = 7.14 x 10^-3 g/L of the molarity of copper II sulphate in the diluted solution.To know more about molarity visit:
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A student is conducting a lab investing solutions. The student starts by adding a set amount of sugar to water. After stirring, all of the sugar has dissolved. The student adds more sugar but does not dissolve. He continues to stir, but the sugar will not dissolve. The student correctly concludes that the first amount of sugar added caused the solution to be.
Sugar dissolves in water because intermolecular connections between the slightly polar sucrose molecules and the polar water molecules release energy.
The weak bonds that form between the solute and the solvent compensate for the energy needed to disrupt the structure of both the pure solute and solvent. When sugar dissolves in a liquid, the sugar molecules take up the space between the water molecules.
As a result, they don't contribute any extra room. Thus, the volume of the solution does not change. Sugar dissolves more quickly in hot water than it does in cold water because hot water has more energy. The molecules of water move more swiftly and energetically when it is heated.
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a chemistry student found the density of freon-11 (cfcl3) to be 5.58 g/l under her experimental conditions. her measurements showed that the density of an unknown gas was 4.38 g/l under the same conditions. what is the molar mass of the unknown? a. 96.7 g/mol b. 108 g/mol c. 127 g/mol d. 165 g/mol e. 175 g/mol
The molar mass of the unknown gas is 96.7g/mol so the correct option is (a).
The molar mass of a synthetic compound is delineated as the mass of a sample of that compound detached from a piece amount relevant that is the number of blemishes within the sample, calculated in moles. The molar mass is a size, not microscopic, characteristic of wealth. Molar mass is of excellent importance when starting an experiment.
Molar mass can be calculated by the under-mentioned:
Density = M*P/R*T ---------->(1)
Density = 4.38g/L
Where,
M = molar mass of gas
P = pressure of the gas
R = universal gas constant
T = temperature (273K)
Therefore,
Molar mass = density * universal gas constant * temperature /pressure
Molar mass = 4.38g/L*.0821 L atm/mol K *273K / 1atm
= 97g/mol
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from what maximum height could a 62 kg person jump and land rigidly upright on both feet without breaking their legs? assume that all energy is absorbed by the leg bones in a rigid landing.
A person weighing around 62 kg can jump from a height of 0.329 metres without breaking their legs.
Potential energy present in a jumper from height h. = m g h
which, when the individual strikes the ground, entirely transforms into kinetic energy. Now, the human can only absorb a maximum of 200 J of energy.
m = 62 kg
g = 9.8 m/s²
⇒ m g h = 200 J
⇒ h = 200 J / (62 kg × 9.8 m/s²) = 0.329 m
Therefore, a person can only fall from a height of 0.30 m safely and without breaking both of their legs.
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Silicon is used in computer why
Digital gold.
Explanation:Silicon is the material of choice in the chip industry. Unlike the metals normally used to conduct electrical currents, silicon is a 'semiconductor', meaning that its conductive properties can be increased by mixing it with other materials such as phosphorus or boron.
Answer:Unlike the metals normally used to conduct electrical currents, silicon is a 'semiconductor', meaning that its conductive properties can be increased by mixing it with other materials such as phosphorus or boron. This makes it possible to turn an electrical current on or off.
Explanation:
let's start by finding the location on the periodic table for the atoms for substances that conduct when dissolved. what do you notice about where the atoms are (metals/non-metals/metalloids)?
Both will conduct electricity.
Compound Cu(I) chloride - CuCl Compound potassium iodide = KISolution:
Both compounds are ionic compounds and in molten or in aqueous solution, both will provide the ions. Ions are conducting chemical species.
As we see the position of K, I, Cu, and Cl in the periodic table, we observe that -
K, Cu are metals
I, Cl are nonmetals.
So when compounds are formed by metals and nonmetals by electrostatic attraction force they are ionic compounds and they are conducting material.
Substances that are insoluble in water and do not conduct electricity are composed of non-metallic atoms. Metals are to the left of the line, non-metals are to the right of the line, and the elements immediately next to the line are semimetals. The physical and chemical properties of the atoms of an element depend on their electronic configuration.
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Greta passed a comb through her hair several times. She then placed the comb next to a stream of water flowing from a faucet. Greta observed the stream of water bend toward the comb. How did passing a comb through her hair allow the comb to bend the stream of water?.
Passing a comb through her hair allows the comb to bend the stream of water is option B. by giving the comb an electrical charge.
The comb draws the movement of water in an equal way. The price of the comb attracts the molecules of water within the flow. due to the fact the molecules inside the circulation may be moved without difficulty, the circulate bends toward the comb. because water molecules are polarized molecules, the effect is stronger than with dust.
While a comb is run thru your hair charges pass between your hair and the brush, so the comb turns into charged both definitely or negatively, and the hair is oppositely electrical charge.
The brush, blanketed in negatively charged electrons, becomes negatively charged as nicely, and your hair is left with a high-quality fee. This “separation of fee” is the purpose of the collection of effects we call static strength. If gadgets have specific prices, they appeal to (or pull towards) every other.
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Disclaimer:- your question is incomplete, please see below for the complete question.
Greta passed a comb through her hair several times. She then placed the comb next to a stream of water flowing from a faucet. Greta observed the stream of water bend toward the comb. How did passing a comb through her hair allow the comb to bend the stream of water?
A. by making the comb more absorbent.
B. by giving the comb an electrical charge.
C. by increasing the thermal energy of the comb.
D. by breaking some of the chemical bombs in the comb.
What is the estimated effective nuclear charge, zeff, experienced by an electron in a 3p orbital of a chlorine atom?.
The estimated effective nuclear charge, Zeff, experienced by an electron in a 3p orbital of a chlorine atom is 6.1.
The effective nuclear charge is the charge experienced by the outermost valence electrons of an atom. the effective nuclear charge is given as :
Zeff = Z - s
where,
Z is the actual nuclear charge
s is the screening costant
The electronic configuration for the chlorine atom is :
₁₇Cl = (1s²) (2s² 2p⁶) (3s² 3p⁵)
The formula for calculating screening constant of 3p electron is :
s = ( 0.35 ( number of electrons in n ) + 0.85 ( electron in (n-1 ) ) + 1 ( electrons in ( n-2 )
s = 0.35 (6) + 0.85 ( 8 ) + 1 ( 2 )
s = 10.9
Zeff = Z - s
Zeff = 17 - 10.9
Zeff = 6.1
Thus, The estimated effective nuclear charge, Zeff, experienced by an electron in a 3p orbital of a chlorine atom is 6.1.
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select true or false: beryllium, the first element in group 2a, is the most metallic element in the group.
The beryllium, the first element in group 2(a), is the most metallic element in the group. this is false . Beryllium is not the most metallic element in group 2(a)
The Beryllium is the element of group 2(a) and is metal but not the most metallic element. The element which is most metallic element is radium . The is when we move from top to bottom in a group the metallic character increases. the beryllium is on the top so, it is least metallic character.
Thus, The beryllium, the first element in group 2(a), is the most metallic element in the group. this is false . Beryllium is not the most metallic element in group 2(a)
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What would happen to the energy of the σ1s mo if the h atoms in h2 were pulled apart to a distance twice as long as its normal bond length?.
Energy of the σ1s MO if the h atoms in H₂ were pulled apart to a distance twice as long as its normal bond length then the energy would increase and radius would decreases
If coulomb force is positive and negative then in the hydrogen atom nucleus is positive charge and electron is localized in its 1st orbit and coulombs are said to f final = 2f and if the force increases the energy level increases and the electron and the positive charge are both in the opposite nature so the orbit would be shrinking toward the nucleus so that's why the radius would decreases
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