When a substance is dissolved in water, forming a 0.50m solution and 8.0 liters of the solution contains 240 grams of the substance then the molecular mass of the substance is 60 g/mol.
Given,
m = 240 g
MM = 0.5 mol/L
V = 8 L
∴ M = m/(MM × V)
⇒ MM = m/(M × V)
Where,
m = mass
M = number of moles
V = volume in L
MM = molecular mass
Substituting the values we get,
Molecular mass = 240 g/(0.5 mol L⁻¹ × 8 L)
⇒Molecular mass = 240/4 g/mol = 60 g/mol
Hence, the molecular mass of the substance is 60 g/mol.
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A solution is made by mixing 90.g of acetyl bromide CH3COBr and 89.g of benzene C6H6 . Calculate the mole fraction of acetyl bromide in this solution. Round your answer to 2 significant digits.
The mole fraction of acetyl bromide in this solution is 0.39.
Calculation:-
The molar mass of CH3COBr,
MM = 2*MM(C) + 3*MM(H) + 1*MM(O) + 1*MM(Br)
= 2*12.01 + 3*1.008 + 1*16.0 + 1*79.9
= 122.944 g/mol
Molar mass of C6H6,
MM = 6*MM(C) + 6*MM(H)
= 6*12.01 + 6*1.008
= 78.108 g/mol
n(CH3COBr) = mass/molar mass
= 90.0/122.944
= 0.732
n(C6H6) = mass/molar mass
= 89.0/78.108
= 1.1394
n(CH3COBr),n1 = 0.732 mol
n(C6H6),n2 = 1.1394 mol
Total number of mol = n1+n2
= 0.732 + 1.1394
= 1.8715 mol
Mole fraction of CH3COBr:
X(CH3COBr) = n1/total mol
= 0.732/1.8715
= 0.39
The mole fraction can be calculated by dividing the number of moles of one component of the solution by the sum of the number of moles of all components of the solution. Take care that the sum of the mole fractions of all components in the solution is 1. Calculate the mole fraction of solute by dividing the number of moles of solute by the total number of moles of substance present in the solution.
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Draw a line to connect the following terms to their definition
1 fossil fuel
2 material resource
3 natural resource
DEFINITIONS
A resource used to make objects,food, or drink
B any natural material used by people
C a nonrenewable resource formed by buried remains of plants and animals
Answer:
Fossil fuel C
Material resource A
Natural resource B
Hope this helps
Explanation:
Answer:
Fossil fuel-----a nonrenewable resource formed by buried remains of plants and animals
Material resource-----any natural material used by people
Natural resource-----resource used to make objects, food, or drink
Explanation:
Fossil fuels are widely known as a nonrenewable source of energy that can be found by garnering the buried remains of plants and animals deep in the ground.
Material resources are natural resources we extract from the earth that have value and practical use for humans.
Natural resources are resources we extract from nature and use in order to survive. Natural resources are things such as water, food, and trees (aka material for shelter.)
Large marble chips (calcium carbonate) were reacted with 1M hydrochloric acid at 24 C. The volume of carbon dioxide evolved was measured at regular intervals.
a) Describe one other way of measuring the course of this reaction which does not involve measuring the volume of carbon dioxide given off.
b) Describe how the following would affect the speed of this reaction, ( In each case, assume that all other factors are kept the same.)
i. using 0.05 M hydrochloric acid
ii. using smaller marble chips
iii. carrying out the reaction at 22 C.
a) The rate of reaction can be measured from the mass of the marble chips that disappear.
b)
i) The rate of reaction would decrease
ii) The rate of reaction would increase
iii) The rate of reaction would decrease
What is the rate of reaction?The term rate of reaction has to do with the speed with which reactants are converted into products. We know also that we can be able to define the rate of reaction as the rate at which the products do appear in a reaction. From our two definitions of the rate of reaction, we can see that we could look at the idea of the rate of reaction from two perspectives which are;
1) Change in the amount of recaatnts
2) Change in the amount of products
The both approaches can be measured by the use of different methods that can be used in the study of chemical reactions.
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at a certain concentration of h2 and nh3, the initial rate of reaction is 22.0 m / s. what would the initial rate of the reaction be if the concentration of h2 were halved? be sure your answer has the correct number of significant digits.
To find the correct number significant digits, learn the concentration and initial rate.
What is concentration?
In chemistry and related fields, the idea of concentration is used frequently. It is a way to gauge how much of one substance is incorporated into another.
What is initial rate?
When a reaction first begins, or when t = 0, its initial rate is the rate that exists at that precise moment. At time zero (t), the slope of the reactant concentration versus the time curve is equal to the initial rate.
Rak=k(H₂) (NH₃) Rak law expression
1. reaction order w.r.t H₂ is ⇒2
2. reaction order w.r.t NH₃ is⇒ 1.
3. overall order 2+1=3 ( bird order reaction)
4. k(H₂) (NH₃)= 0.740⇒ 1
H₂ is doubled ⇒ r₂=k(H₂) (NH₃)=4k(H₂) (NH₃)⇒2
(2)/(1) = r₂/r₁ = 4k(H₂) (NH₃)/k(H₂) (NH₃)=4
r₂= 4∝ r₁ = 4∝ 0.740=2.96m/s
5. r= 6.0∝ 10^⁴m/s, (H₂)= 0.98m, (NH₃)= 0.31m
r=k(H₂) (NH₃)
k=r/(H₂) (NH₃)= 6.0 ∝ 10^⁴/(0.98)^²(0.31)=201528.93m^⁻²s^⁻¹
K=2.0 ∝ 10^5m^⁻²s^⁻¹
Therefore, the significant digit is K=2.0 ∝ 10^5m^⁻²s^⁻¹
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a mixture of he , ar , and xe has a total pressure of 2.50 atm . the partial pressure of he is 0.250 atm , and the partial pressure of ar is 0.400 atm . what is the partial pressure of xe ? express your answer to three significant figures and include the appropriate units.
The partial pressure of Xe will be 1.85 atm.
How to find the partial pressure?
The total pressure is equal to the sum of the partial pressures. The total pressure is equal to the sum of the partial pressures.
Subtract the sum of the known partial pressures of the other components from the overall pressure to determine the partial pressure of one component in a mixture.
Given values: P_{He} = 0.250 atm, P_{Ar} = 0.400 atm, P_{total} = 2.50 atm
To Find: P_{Xe} = ?
Solution: Calculate the total pressure, then deduct the sum from the partial pressures of helium and argon.
P_{He} + P_{Ar} = 0.250 atm + 0.400 atm = 0.650 atm
P_{Xe} = P_{total} - (P_{He} + P_{Ar}) = 2.50 atm - 0.650 atm
P_{Xe} = 1.85 atm
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What is the formula for water? Gsyrr9gr7d7f8
Answer: H2O
Explanation: Water is made from 2 hydrogen atoms and 1 oxygen atom bonded together.
Answer: H₂O
each molecule of water is made up of two hydrogen atoms, H, and a single oxygen atom, O.
According to Coulomb's Law, provide an example and explanation of two ions in an ionic
chemical bond that forms large electrostatic potential.
According to Coulomb's Law two ions in an ionic chemical bond that forms large electrostatic potential then the two will attract each other
Coulomb law states that bond energy is inversely related to the bond length and so factor which influence bond strength influence its length this can allow us to determine some trends in bind length and ionic compound are held together by coulombic attraction and there is a negatively charged ion next to a positively charged ion and two will attract each other and when positively charged ion form a bond with negatively charged ion one atom donate electron to the other and this is known as ionic bind and the chemical molecule sodium chloride is an example
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what is the half-life of the reaction, if the reaction is 25% complete in 94.9 min at 25c. (keep in mind that the half-life of this reaction is independent of concentration). be sure to enter your answer with the correct units.
the half-life of the reaction is 50min
Half life of the reaction is actually the time required for the reaction to reach one half of its initial concentration or sometimes pressure too. The half-life of a specific radioactive isotope remains constant and so it is unaffected by conditions and is independent of the initial amount of that isotope.
To calculate the half life of the reaction we use the below given formula;
K = 2.303 × log 100
94.9 25
K = 0.014
Half life = 0.693 ⇒ 0.693
K 0.014
Half life = 49.5 ≈ 50min
Therefore the half-life of the reaction is 50min.
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which compound in each of the following pairs of ionic substances has the most exothermic lattice energy? justify your answers. mgo, bas
The compounds of ionic substances with the most exothermic lattice energy are:
LiF, LiCl Mg(OH) 2, MgO Fe(OH) 2, Fe(OH) 3Correct answer: letters B, C y D.
This is because these ionic substances have the most exothermic lattice energy because they form ionic bonds, which are very strong, and these three alkali metals are in the first row of the periodic table.
What are the compounds with the highest exothermic lattice energy?The compounds of ionic substances with the most exothermic lattice energy are those in which the ions have the largest difference in electronegativity.
The lattice energy of an ionic substance is the energy required to completely separate the ions in the solid state. The compound with the most exothermic lattice energy is the one that is the most stable. In general, the larger the ionic radius, the more exothermic the lattice energy.
Which compound in each of the following pairs of ionic substances has the most exothermic lattice energy?
Group of answer choices:
a) NaCl, KCl
b) LiF, LiCl
c) Mg(OH) 2, MgO
d) Fe(OH) 2, Fe(OH) 3
e) NaCl, Na 2
f) MgO, BaS
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(These are not descriptions of any actual elements on our periodic table, but you should use reasoning that works with our periodic table.)
A scientist is testing three mystery elements. She is trying to figure out their placement on the periodic table. Here is what she knows about them:
Element X: Does not conduct electricity, reacts with hydrogen in a 1:2 ratio, has the highest atomic weight of the three elements
Element Y: Does not conduct electricity, reacts with hydrogen in 1:3 ratio, has the lowest atomic weight of the three elements
Element Z: Conducts electricity, reacts with hydrogen in a 1:3 ratio, has the mid-level atomic weight of the three elements
—------------------------------------------------------------------------------------------------------------------------
How should she arrange these three elements relative to each other on the periodic table?
You may want to draw your answer for clarity. Explain your reasoning for placement using words like left, right, above, and below.
In the periodic table, where atomic mass increases from left to right in period, therefore elements in increasing order of atomic mass will be element Y, element Z, element X.
What is periodic table?Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.
It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.
Elements present in the same group have same number of valence electrons and hence have similar properties while elements present in the same period show gradual variation in properties due to addition of one electron for each successive element in a period.
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What does ocean water contain that helps produce carbonate minerals from carbon dioxide
Answer:
Carbon dioxide (CO2) dissolves in the ocean and reacts with water to form carbonic acid—which in turn generates bicarbonate, carbonate, and hydrogen ions. Calcium and carbonate ions combine to form the solid calcium carbonate crystals in their shells and skeletons.
A kcl solution is prepared by dissolving 25.0 g kcl in 250.0 g of water at 25°c. what is the vapor pressure of the solution if the vapor pressure of water at 25°c is 23.76 mm hg?
Vapor pressure of solution is 23.189mm hg
The mole fraction or the molar fraction is defined as the unit of amount of the substances, divided by the total amount of all the substances that are present in the mixture. The formula for it is given below;
[tex]X_{A}[/tex] = [tex]N_{A}[/tex] ÷ [tex]N_{A}[/tex] + [tex]N_{B}[/tex] (Where N represents the number of moles of A and B respectively)
Vapor pressure is defined as the pressure that is exerted by a vapor which is in equilibrium with its condensed phase at a given temperature in a closed system.
In the above given question we need to find out the vapor pressure of KCl where vapor pressure of water is given, so we use the following method to solve this question;
[tex]N_{A}[/tex] = weight of water = 250 = 13.88
Molecular mass 18
[tex]N_{B}[/tex] = weight of KCl = 25 = 0.335
Molecular mass 74.55
So, [tex]X_{A}[/tex] = 13.88 = 0.976 [[tex]P_{o}[/tex] = 23.76]
13.88 + 0.335
We know that P = [tex]P_{o}[/tex][tex]X_{A}[/tex]
P = 23.76 × 0.976 ⇒ 23.189
Therefore the vapor pressure of the solution is 23.189mm
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Question What does the law of conservation of mass state? Responses Mass can be created and destroyed during a chemical reaction. Mass can be created and destroyed during a chemical reaction. Mass can be created but not destroyed in a chemical reaction. Mass can be created but not destroyed in a chemical reaction. Mass cannot be created nor destroyed in a chemical reaction. Mass cannot be created nor destroyed in a chemical reaction. Mass can be destroyed but not created during a chemical reaction.\
According to the rule of conservation of mass, no atoms are created or destroyed during a chemical process. Instead, the atoms combine in a variety of ways to create goods.
What is law of conservation of mass ?According to the law of conservation of mass or principle of mass conservation, any system that is closed to all transfers of matter and energy must maintain a constant mass over time since the system's mass cannot vary and neither more nor less amount can be added or subtracted.
The law of conservation of mass, no atoms are created or destroyed during a chemical process. Instead, the atoms combine in a variety of ways to create goods. This is why each element has the same amount of atoms on both sides of an equation with balanced symbols.
Thus, According to the law of conservation of mass, mass is neither generated nor destroyed during a chemical process.
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the vsepr theory is used to group of answer choices predict the number of multiple bonds in a molecule. predict the bonding pattern in molecules. predict the three dimensional structure of molecules. predict the electronegativity of atoms.
The VSEPR theory is used to predict the three dimensional structure of molecules.
What is VSEPR theory?
Chemistry uses the valence shell electron pair repulsion (VSEPR) theory as a model to forecast how each individual molecule would look based on how many electron pairs will be surrounding its center atom. The two principal creators of the theory, Ronald Gillespie and Ronald Nyholm, gave it the additional moniker Gillespie-Nyholm theory.
The valence electron pairs that surround an atom have a tendency to oppose one another, thus they will arrange themselves in a way that minimizes this repulsion, according to the premise of VSEPR. The molecular shape is thus determined by a decrease in the energy of the molecule and an increase in its stability. The Pauli exclusion principle's electron-electron repulsion, rather than electrostatic repulsion, has been stressed by Gillespie as being more significant in dictating molecular geometry.Therefore, the VSEPR theory is used to predict the three dimensional structure of molecules.
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AgNO3 reacts woth MgCl2 to produce AgCl and Mg(NO3)2. 305g of AgNO3 are reacted in an excess of MgCl producing 23.7g of Mg(NO3)2. what is fhe percentage yeild
The percentage yield when 305g of AgNO3 are reacted in an excess of MgCl producing 23.7g of Mg(NO3)2 is 7.77g
What is a percentage yield?Yield, also known as reaction yield, is a measurement of the number of moles of a product created in a chemical reaction relative to the reactant consumed. It is typically given as a percentage yield.
Formula to calculate the percentage yield: percent yield = actual yield/theoretical yield x 100
Acc. to the given data:
Actual yield = 23.7g
Theoretical yield=305g
So to find the percentage yield = actual yield/theoretical yield x 100
Percentage yield = 23.7/305 x100
Percentage yield=7.77g
Hence The percentage yield when 305g of AgNO3 are reacted in an excess of MgCl producing 23.7g of Mg(NO3)2 is 7.77g
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When two oxygen atoms bond together in o2 what type of covalent bond do they form.
When two oxygen atoms bond together in O2, they form a non-polar covalent bond.
What are covalent bonds?
A covalent bond is a chemical bond that involves the sharing of electrons to form electron pairs between atoms. These electron pairs are mentioned as shared pairs or bonding pairs. once they share electrons, the stable balance of attractive and repulsive forces between atoms is known as a covalent bond When two oxygen atoms are bonded as O2, they form a non-polar covalent bond. When two non-metal atoms sharing of electrons, a covalent bond is created. The involved electrons are located in the atoms' outer shells. An atom's outer shell will be completed if it shares one or both of its electrons. Covalent bonds require a lot of energy to break because they are so strong.
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based on the balanced chemical equation for reaction 5 what compounds were being removed when the recovered copper product was washed repeatedly with water? 4. (2 pts) why was ethanol used during the final washes of the recovered copper product? 5. (2 pts) why was a steam bath used to dry the recovered copper product? (hint: reference the reaction 5 steps in lab manual)
Compounds were being removed when the recovered copper product was washed repeatedly with water is aluminum III and copper II sulphate being removed
Compound is a substance made from two or more different elements that have been chemically joined and when the recovered copper product was washed repeatedly with water and the compound removed during those washes were aluminum III and copper II sulphate and the ethanol is to remove the water clinging to the solid and the ethanol evaporated faster and end up with dry solid faster and dispense with the ethanol wash but wait longer to dry the product and used other solvent such as acetone or heat the product
A steam bath is used instead of a hot plate to dry recovered copper to prevent overheating and overheating can lead to atmosphere oxygen oxidizing the copper and causing impurities
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g of CO2 and g of H20 are produced when 64.0g C2H2 burn in oxygen
Gram of CO₂ and g of H₂O are produced when 64.0g C₂H₂ burn in oxygen is CO₂ is 216 g and H₂O is 44.28 g
Gram is the unit of mass or weight that is used especially in the centimeter gram-second system of measurement
Here reaction is
2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O
So, 1 mole of C₂H₂ = 2(12) + 2(1) = 26 g
1 mole of CO₂ = 12 + 2(16) = 44 g
1 mole of H₂O = 2(1) + 16 = 18 g
So, 64.0 g C₂H₂ × 1 mol/26g = 2.46 mol C₂H₂
2.46 mol C₂H₂ × 4CO₂/2C₂H₂ = 4.92 mole of CO₂
4.92 mole CO₂ × 44 g/mol = 216 g CO₂
64.0g C₂H₂×1 mol/26 g = 2.46 mol C₂H₂
2.46 mol C₂H₂×2H₂O/2 C₂H₂ = 2.46 mol H₂O
2.46 mol H₂O×18 g/mol = 44.28 g H₂O
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to a concentrated buffer of ph 9.0 was added an equal volume of an aqueous solution that was 0.20 m in each of the ions ca2 , cd2 , and cu2 . the expected precipitate would consist of:
Aqueous Solution - The expected precipitate would consist of Cu(OH)2.
What is aqueous solution?
An aqueous solution is one in which water serves as the solvent. Chemical equations typically illustrate it by adding (aq) to the appropriate chemical formula. For instance, Na+(aq) + Cl would be used to represent a solution of table salt, as well as sodium chloride (NaCl), throughout water (aq). The word aqueous, which derives from the word aqua, means that it is dissolved in or related to water. Water is a common solvent in chemistry due to its superior solvent properties and natural abundance. Since water is frequently used as a solvent in experiments, unless the solvent is specified, the word "solution" refers to an aqueous solution. A solution wherein the solvent is a liquid but not water is referred to as a non-aqueous solution.
Because:
salt: copper(II) hydroxide
Ksp: 1.8 × 10-19
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HELP
Balance the following skeleton equation and determine how many grams of water can be produced when 50.0 grams of Al(OH)3 react with 60.0 grams of H2SO4 .
Al(OH)3 + H2SO4 --> Al2(SO4)3 + H2O
Explanation:
2Al(OH)3 + 3H2SO4 --> Al2 (SO4)3 + 6H2O
How many liters do 1.55 g of O2 occupy at STP?
The volume that is occupied by the given mass of the oxygen gas is 1.1L
What is the volume?We know that the volume has to do with the space that is occupied by a gas. Now we know that from the Avogadro's law, the volume that is occupied by a gas is called the molar volume of the gas and it has a value of 22.4 L.
We now have;
Number of moles of the gas = 1.55 g/32 g/mol
= 0.048 moles
If 1 mole of the gas occupies 22.4 L
0.048 moles of the gas is going to occupy 0.048 moles * 22.4 L/1 mole
= 1.1 L
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If 1500 liters of hard water contains .02 moles of calcium and .004 moles of magnesium how many moles of sodium are needed to replace these ions?
The magnesium ions require 0.04 moles of sodium ions while the calcium ions require 0.008 moles of the sodium ions.
How many moles of sodium can replace the ions?We know that is the presence of the calcium and the magnesium in water that makes the water hard. These ions are divalent and are often removed by the use of an ion exchange resin. The ion exchange resin has the sodium ion at the surface which is easily exchanged for any of the hardness ions.
Given that;
2 moles of sodium reacts with 1 mole of magnesium
x moles of sodium reacts with 0.02 moles of magnesium
x = 0.04 moles of sodium ions
For calcium;
2 moles of sodium reacts with 1 mole of calcium
x moles of sodium reacts with 0.004 moles of calcium
x = 0.008 moles of sodium
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The relative ability of a bonded atom to attract shared electron pairs is called its _____. This ability _____ as the size of the atom decreases because for a smaller atom the shared electrons will be closer to the nucleus.
The relative ability of a bonded atom to attract shared electron pairs is called its electronegativity. This ability increases as the size of the atom decreases because for a smaller atom the shared electrons will be closer to the nucleus.
A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms. These electrons are simultaneously attracted to two nuclei.
Electronegativity is defined as the ability of an atom within a molecule to attract electrons to itself. The concept of an elemental electronegativity scale was proposed by Pauling.
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What will happen to the carbon dioxide produced by the link reaction in an animal?.
Answer:
The link reaction links Hint to the Krebs Cycle. It converts pyruvic acid to Acetyl-CoA. Carbon dioxide is released as a waste product, and one Hint is produced.
Explanation:
A carbon atom is taken out of pyruvate during the link reaction, creating carbon dioxide. Pyruvate is converted into acetate along with the removal of hydrogen, which is then taken up by the coenzyme NAD to create reduced NAD.
What is pyruvate ?The conjugate base of pyruvic acid is pyruvate. It serves as a crucial intermediary in a number of biological processes. It is created at the conclusion of glycolysis and serves as a catalyst for a number of metabolic processes, including gluconeogenesis, fermentation, cellular respiration, fatty acid synthesis, etc.
During cellular respiration, glucose and oxygen combine to produce carbon dioxide, water, and energy. Animals breathe out most of their carbon dioxide, which is then discharged into the atmosphere. Plants can then use this carbon dioxide for photosynthesis.
Acetyl-coenzyme A, the link reaction's final byproduct, then moves into the Krebs Cycle. Through the oxidation of acetyl-coenzyme A, the Krebs Cycle generates energy.
Thus, pyruvate is changed into the two-carbon molecule known as acetate.
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the mass of 4 atoms of c is less than the mass of 3 atoms of element d. which element has more atoms/gram?
The mass of 4 atoms of c is less than the mass of 3 atoms of element d then the c element has more atoms/gram
Mass is a measure of the amount of matter in a substance or an object
Here given data is
4 atom of c
3 atom of d
We have to calculate element has more atoms/gram = ?
So 4 atom of c < 3 atom of d
So the so c has larger molar mass so c ahs the more atom/gram
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Suppose that on a hot and sticky afternoon in the spring, a tornado passes over the high school. If the air pressure in the lab (volume of 180 m 3 ) was 1. 1 atm before the storm and 0. 85 atm during the storm, to what volume would the laboratory try to expand in order to make up for the large pressure difference outside? 1,800 m 3 230 m 3 7,100 m 3 190 m 3.
Option (b) 233m3 volume of gas would the laboratory try to expand in order to make up for the large pressure difference outside.
Boyle's Law states that the volume of a given mass of a gas is inversely proportional to pressure at constant temperature. V is inversely proportional to P. both V and P are constant.
V1 P1 = V2 P2
Where, p1=initial pressure
V1= initial volume
P2 =final pressure
V2= final volume
Here, p1 is 1.1atm p2 is 0.85 atm v1 is 180m3 .
Putting these values in the expression
1.1atm * 180m3 = 0.85atm *V2
V2= (1.1atm . 180m3) /0.85atm
= 233m3
Hence, 233m3 of gas is needed to expand in order to make up for the large pressure difference outside.
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Sodium reacts vigorously with water; which other elements also do and why?
The high electropositive nature results in a low enthalpy of ionization and a low melting point. So when you add sodium to the water, it reacts violently to produce NaOH and H2.
Since alkali metals like sodium have only one valence electron they tend to donate that electron to nonmetals to achieve stability. They usually react fastest with halogens such as chlorine fluorine iodine and bromine. Because these halogens have seven valence electrons. Sodium is much more active than hydrogen, so it reacts violently with water.
Sodium is more reactive than lithium because it is larger. The outermost electrons are less strongly retained in sodium than in lithium. As a result, sodium loses its outermost electrons more easily than lithium. Therefore, it is more reactive than lithium. Of the options given, the reaction between chlorine and potassium is the most violent. Because, according to the periodic characteristics, the reactivity of potassium and chlorine is very high.
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Use the periodic table and your knowledge of isotopes to complete these statements.
When polonium-210 emits an alpha particle, the child isotope has an atomic mass of
.
I-131 undergoes beta-minus decay. The chemical symbol for the new element is
.
Fluorine-18 undergoes beta-plus decay. The child isotope has an atomic mass of
When polonium-210 emits an alpha particle, the child isotope has an atomic mass of 206.
I-131 undergoes beta-minus decay. The chemical symbol for the new element is ¹³¹₅₄Xe
Fluorine-18 undergoes beta-plus decay. The child isotope has an atomic mass of 18.
What are isotopes?Isotopes are atoms of the same element that have the same atomic mass number but different masses as a result of the difference in the number of neutrons in the element.
When polonium-210 emits an alpha particle, the equation is given below:
²¹⁰₈₄Po ---> ²⁰⁶₈₂Pb + ⁴₂He
When I-131 undergoes beta-minus decay, the equation is given below:
¹³¹₅₃I ---> ¹³¹₅₄Xe + ⁰₋₁β
When fluorine-18 undergoes beta-plus decay, the equation is given below:
¹⁸₉F ---> ¹⁸₈O + ⁰₁β
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Describe a method for making pure crystals of magnesium chloride from magnesium and dilute hydrochloric acid
The method for making pure crystals of magnesium chloride from magnesium and dilute hydrochloric acid is given below:
Making pure crystals of magnesium chloride from magnesium and dilute hydrochloric acidAccording to the reaction, magnesium and weak hydrochloric acid react to create magnesium chloride and release hydrogen gas.
MgCl2 (aq) + H2 from Mg (s) + 2HCl (g)
Following is the process for extracting pure magnesium chloride from the reaction.
First: Reaction
Keep a beaker with the diluted hydrochloric acid inside.Add magnesium gradually until there is an excess or until no more gas appears to be escaping.Second step: filtering
Filter using a funnel and filter paper. Remove the surplus magnesium by filtering it out because the filtrate will contain aqueous (liquid) magnesium chloride. The surplus magnesium is in the residual.To create solid crystals from the filtrate, go to:
Step three, crystallization.
Transfer filtrate solution to a dish or basin for evaporation.Transfer filtrate solution to a dish or basin for evaporation. Use a Bunsen burner to provide heat Pour the solution into a basin that will evaporate it, then warm it over a water bath.Turn off the heat when crystals begin to form.Let the water drain until only pure crystals are left.Dry crystals in a heated oven or on absorbent paper.Lastly, Precautions:
Wear eye protection, especially when heating, and use personal protective equipment such gloves and lab coats.Prevent breathing in extra gases while the process is underway.Learn more about magnesium chloride from
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Explain the difference between aliphatic hydrocarbons and aromatic hydrocarbons.
Answer:
Explanation:
Aliphatic compounds are those hydrocarbons that are the open chain compounds and also closed chains. Aromatic compounds are those who have only a closed chain structure. They can be saturated as well as unsaturated where the system can be open as well as closed chain.