The Ka of the weak acid is 6.28 × 10⁻⁶.
Ka is the acid dissociation constant, which quantifies the extent of acid dissociation in water.
Balanced chemical reaction (dissociation) of an aqueous solution of a weak acid:
HA(aq) ⇄ H⁺(aq) + A⁻(aq)
pH = 2.708
c(H⁺) = 10⁻²°⁷⁰⁸
c(H⁺) = 1.96 × 10⁻³ M; concentration of hydrogen ions
c(H⁺) = c(A⁻); from balanced chemical reaction
c(HA) = 0.613 M - 1.96 × 10⁻³ M
c(HA) = 0.611 M; concentration of an acid in the solution
Ka = c(H⁺) × c(A⁻) / c(HA)
Ka = (1.96 × 10⁻³ M)² / 0.611 M
Ka = 6.28 × 10⁻⁶; the acid dissociation constant
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Earth has experienced many long periods of climatic cooling during which glaciers cover large areas of Earth. These periods are known as ice ages. Which of the following is a likely cause of ice ages?
A.
periodic changes in the shape of Earth's orbit
B.
the movement of the continents due to continental drift
C.
the shutdown of thermohaline circulation in the ocean
D.
periodic reversals to Earth's magnetic field
The phenomenon of the 'periodic changes in the shape of Earth's orbit' likely caused ice ages in the past (Option A).
What caused the ice ages?The ice ages are periods in the geological past in which temperature drastically decreased over thousands of years, which may be due to different factors such as Earth's orbital changes, volcanoes, modification in the ocean currents, amount of solar radiation, increase in the CO₂ and global warming, etc
In conclusion, the phenomenon of the 'periodic changes in the shape of Earth's orbit' likely caused ice ages in the past (Option A).
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Why is the Earth considered an open system?
matter
light and energy enter the system from the sun
energy and matter (gases) escape the system into space
all of the answers are true
(meteoroids/asteroids) can enter the system from space
Explanation: Any system within the Earth system is considered an open system. Because energy flows freely into and out of systems, all systems respond to inputs and, as a result, have outputs. For example, water and chemicals, as well as energy enter and leave the boundaries of a watershed system.
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(i) Transition elements have similar properties. qua
Explain why in terms of electronic structure.
Since they all have the same number of valence electrons, transition elements share similar characteristics.
Why do elements have similar properties?The quantity of valence electrons in an element determines its physical and chemical properties. The number of valence electrons shared by elements belonging to the same group is constant. As a result, the physical and chemical properties of elements belonging to the same group are similar.
Why is electronic configuration of transition elements irregular?The energy of n1 d orbitals and ns orbitals differs slightly in transitional elements. As a result, an incoming electron may occupy either shell. As a result, the electronic configurations of transition elements show numerous irregularities.
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Balance the following chemical equation (if necessary): zns(s) aip(s) --> ai2s3(s) zn3p2(s)
The balanced equation is as follows:
3ZnS(s) + 2AiP(s) ⇒ [tex]Ai_{2} S_{3}[/tex] (s) + [tex]Zn_{3} P_{2}[/tex] (s)
To write a balanced equation:
1.The left and right sides of the reaction arrow of a balanced equation have an equal number of each type of atom.
2.The reactants and products are placed on the left and right sides of the arrow, respectively, to create a balanced equation.
3.Coefficients, which appear as a number before a chemical formula, represent moles of a compound. The number of atoms in a single molecule is indicated by the subscripts (numbers below an atom).
4.Multiply the subscript and the coefficient to determine the number of atoms. Add all the atoms on each side of the arrow if the atom is present in more than one reactant or product.
5.The coefficient or subscript "1" indicates that there is just one molecule or atom.
Therefore, the balanced equation is as follows:
3ZnS(s) + 2AiP(s) ⇒ [tex]Ai_{2} S_{3}[/tex] (s) + [tex]Zn_{3} P_{2}[/tex] (s)
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Rank the compounds in order of increasing boiling point.
a. ch3(ch2)4i
b. ch3(ch2)5i
c. ch3(ch2)6i
Rank the compounds in order of increasing boiling point:
a. CH₃(CH₂)₄I, b. CH₃(CH₂)₅I, c. CH₃(CH₂)₆I.
The boiling point of a substance is the temperature at which the vapor pressure of the liquid equals the pressure surrounding the liquid and the liquid changes into a vapor.
The boiling point in this example depends on molar mass of the compounds.
The greater the molar mass of the compound, the greater is the boiling point.
M(CH₃(CH₂)₄I) = 197.9 g/mol; molar mass
M(CH₃(CH₂)₅I) = 211.9 g/mol
M(CH₃(CH₂)₆I) = 225.9 g/mol
The compound CH₃(CH₂)₆I has the greater molar mass, so it has the greatest boiling point.
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1.00 g of carbon is combusted in a limited supply of pure oxygen. 0.50g of the carbon combusts
to form CO₂ and 0.50g of the carbon combusts to form CO.
The resultant mixture of CO₂ and CO is passed through excess NaOH(aq) and the remaining gas
is then dried and collected.
What is the volume of the remaining gas? (All gas volumes are measured at 25°C and
1 atmosphere pressure.)
A 1dm³
B 1.5 dm³
C 2 dm³
D 3 dm³
Answer:
Explanation:d
Questions 1-10: Complete the Bohr
Mode for each following elements.
Answer:
proposed an early model of the atom as a central nucleus containing protons and neutrons being orbited by electrons in shells. As previously discussed, there is a connection between the number of protons in an element, the atomic number that distinguishes one element from another, and the number of electrons it has. In all electrically-neutral atoms, the number of electrons is the same as the number of protons. Each element, when electrically neutral, has a number of electrons equal to its atomic number.
THANKS
3
Explanation:
Suppose an element has a valence of 2 and an atomic number of 27. based only on quantum numbers, how many electrons must be present in the 3d energy level?
There must be 7 electrons present in the 3d energy level.
The atomic number is 27.
Thus, for 1st energy level, there is only 1 subshell present which is 1s² containing 2 electrons.
For the 2nd energy level, there are 2 subshells which are
2s² = 2 e⁻s
2p⁶ = 6 e⁻s
The number of electrons at the third energy level, x, can be assumed.
Then, 1s²2s²2p⁶3s²3p⁶4s²3dˣ (valence = 2 requires 2 electrons in 4s).
In the third level, there must be 7 electrons
since 27 - (2+2+6+2+6+2) = 7 = x.
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Sometimes when performing a crystallization, one solvent alone will not work and you have to use a solvent-pair. Will the solvent pair hexane and diethyl ether work? why or why not?.
Yes, hexane and diethyl ether, a solvent pair, will definitely function as a team during crystallization.
This is due to the fact that crystal formation requires a miscible solvent pair. Normally, two solvents—one in which the compound is soluble and one in which it is not—are required for crystallization. Additionally, these two solvents ought to mix easily.
Hexane and diethyl ether, the given solvent pair, are miscible with one another. Therefore, we can crystallize using the solvent pair mentioned above.
What is crystallization?
Crystallization is the process of increasing the concentration of a solution to a supersaturated state in order to form solid particles in a homogeneous phase. Crystallization is the process by which crystals are formed from either melted material or a solution.
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Which family (group) of elements has a valence-level electron configuration of 1?
a. noble gases
b. halogens
c. alkali metals
d. alkaline earth metals
The family (group) of elements that have a valence-level electron configuration of 1 are alkali metals. Hence, the answer is option C.
A group or family in the periodic table consists of all the elements arranged in a single vertical column. There are eighteen groups in total. Elements in the same group tend to have the same chemical properties because they contain the same number of electrons in their outermost shells (valence electrons).
Elements in the first group or group 1 have only one electron in their outermost shell. They are known as alkali metals. They are called alkali metals because they react with water to form bases or alkali. These metals must be stored under oil as they are very reactive and easily react with air and water.
Alkali metals are also very electropositive and form ions by giving out their one valence electron, carrying a charge of +1. The three alkali metals are Lithium (Li), Sodium (Na) and Potassium (K), with Potassium being the most electropositive.
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Select a number of substances with which KOH reacts
1) SO2, HNO3, BaCO3
OR
2) CO2, Zn(NO3)2, H3PO4
Different substances are given as SO₂, HNO₃, BaCO₃, CO₂, Zn(NO₃)₂, H₃PO₄
KOH reacts with SO₂ at a lower temperature,
KOH + SO₂ → K₂ SO₃ + H₂ O
Nitric acid (an acid) and potassium hydroxide (a base) combine to form potassium nitrate (salt) and water.
KOH + HNO₃ → KNO₃ + H₂O
When substance potassium hydroxide and Barium carbonate,
KOH + BaCO₃ → K₂ CO₃ + Ba(OH)₂
Carbon dioxide and potassium hydroxide react to produce potassium carbonate and water. Carbon dioxide is taken out of the space station using potassium hydroxide.
KOH + CO₂ → K₂ CO₃ + H₂O
Potassium hydroxide reacts with zinc nitrate,
Zn(NO₃)₂ + KOH → Zn(OH)₂ + KNO₃
Potassium phosphate and water are created when potassium hydroxide and phosphoric acid combine.
KOH (aq) + H₃ PO₄ (aq) → K₃ PO₄ (aq) + H₂O (l)
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Which functional groups are functional group and regent combine to make car basilic acid?
A carboxylic acid is made up of two functional group, alcohol group, involving a hydrogen bond to an oxygen, which is attached to carboxyl group involving carbon double bond to an oxygen.
What are functional group?A functional group is defined as a group of atom or bonds inside a substance that is responsible for the substance unique chemical reaction in organic chemistry.
Some of the major functional group are: hydroxyl, methyl, carbonyl, carboxyl, amino, alcohol, phosphate and sulfhydryl etc.
Carboxylic acid has two types of functional group one is alcohol group and other is carboxyl group.
Thus, carboxylic acid is made up of two functional group, alcohol group, involving a hydrogen bond to an oxygen, which is attached to carboxyl group involving carbon double bond to an oxygen.
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Using the heat of vaporization in calculations
Calculate the mass of water (in g) that can be vaporized at its boiling point with 106 kj of heat. (the dhvaporization at boiling point is 40.7 kj/mol).
The mass of water(in g) that can be vaporized at its boiling point(100°C) with 106 kJ of heat is "46.879g".
According to question:
ΔHvap=40.7kJ/mol
Now,
To calculate the enthalpy change of a reaction we use the formula:
ΔHreaction=Heat/Number of moles
∵Heat absorbed=106kJ
& ΔHreaction=Enthalpy change of the reaction=40.7kJ/mol
∴The number of moles evaporated by 106 kJ heat will be:
106×1÷40.7=2.6044 mol
Now,Number of moles=Given mass/Molar mass
∵Molar mass of water=18
& Number of moles of water=2.6044
Thus,Mass of water=Number of moles×Molar Mass of water
=2.6044×18
=46.879g
∴Mass of water(in g) that can be vaporized at its boiling point=46.879g
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When two monosaccharides condense to form a disaccharide, what is the other product of the reaction? enter the molecular formula.
When two monosaccharides combine to make a disaccharide, water is the byproduct.
What are monosaccharides ?The most fundamental building blocks from which all carbohydrates are constructed are monosaccharides, commonly known as simple sugars. They are the most basic types of sugar. They are typically crystalline solids, colorless, and soluble in water.
These three monosaccharides—glucose, fructose, and galactose—are crucial for nutrition. Six carbon atoms, twelve hydrogen atoms, and six oxygen atoms make up each single sugar molecule.
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What is the molarity of a solution that was prepared by dissolving 82 g of cacl2?
The molarity of a solution is 0.909 M.
m(CaCl₂) = 82 g; mass of calcium chloride
M(CaCl₂) = 111 g/mol; molar mass of calcium chloride
n(CaCl₂) = m(CaCl₂) ÷ M(CaCl₂)
n(CaCl₂) = 82 g ÷ 111 g/mol
n(CaCl₂) = 0.74 mol; amount of calcium chloride
V(CaCl₂) = 812 mL = 0.812 L; volume of calcium chloride
c(CaCl₂) = n(CaCl₂) ÷ V(CaCl₂)
c(CaCl₂) = 0.74 mol ÷ 0.812 L
c(CaCl₂) = 0.909 mol/L = 0.909 M; molarity of calcium chloride
Calcium chloride is a inorganic salt with ionic bonds between calcium and chlorine. It is a colorless crystalline solid at room temperature, highly soluble in water.
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Which organic reagents would you need to make 2-ethylheptanoic acid from diethyl malonate?
The reagents need for the formation of 2-ethyl heptanoic acid are Bromoethane, 1-bromopentane, sodium ethoxide, and potassium tert-butoxide.
When the bromoethane reacts with the diethyl malonate it formed the diethyl 2,2 - diethylmalonate.Bromoethane is an alkylating agent and used in substitution reaction and add alkyl group to the compound. 1-bromopentane carried out the elimination reaction.sodium ethoxide helps in extraction of hydrogen from the compound formed the negative on the compound. potassium tert-butoxide is strong non- nucleophile base which as strong as other bases. it is participating in nucleophilic addition reaction.it follows the SN 2 reactions and also participates in the dehydrohalogenation reaction.All the above reagents are used for the preparation of 2- ethyl heptanoic acid from diethyl malonate.All the above reagents are used for the preparation of 2- ethyl heptanoic acid from diethyl malonate.
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Suggest why some metals will react with hot water but not with cold water. Explain with one example. Draw figure.
The difference in the reactivity of metals accounts for why some metals will react with hot water but not with cold water. For example, aluminum is less reactive than sodium and will only react with hot water but not cold water.
What is reactivity of metals?The reactivity of metals is the ability of a metals to lose electrons.
The reactivity of metals generally decreases from left to right across the periodic table but increases on going down a group.
Due to the differences in reactivity of metals, some metals are more reactive than others.
For example, the reactive metals sodium, potassium and calcium react with cold water to with differing degree of spontaneity to liberate hydrogen.
Some other metal like aluminum, zinc, and iron can only react with hot water or steam to liberate hydrogen.
Therefore, the reactivity of a metal will determine if it will react with cold water or hot water.
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A compound displays peaks at 1670, 2950 and 2220 cm-1 and has a m/z of 150. is the compound likely to be a, b or c?
your question is incomplete.
you haven't mentioned what is a, b and c.
mira added vanilla flavored liquid to a cake and heated . The resulting cake is having vanilla flour. What could have happened
The change in the taste of the cake to vanilla flour is an example of a chemical change.
What are chemical changes?Chemical changes are changes which occur when substances undergo changes that are no easily reversible an in which new substances are formed.
During chemical changes, large amounts of heat changes occur.
Some example of chemical changes is in the rusting of iron, the baking of breads and cake from a mixture of flour sugar and various flavors.
In the given scenario, Mira added vanilla flavored liquid to a cake and heated which resulted in a cake is having vanilla flour. The change in the taste of the cake after the vanilla flavor was added and the cake heated is an example of a chemical change.
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An 8.2 L sample is at -6°C, while a 4.361 L sample is at 56.7°C. The particles of which sample have a larger average kinetic energy?
Write out all work and show all units and use the correct number of significant figures.
The particles of the 4.361 L sample at 56.7°C will have larger average kinetic energy than that of 8.2 L sample at -6°C.
What is the average kinetic energy?The average kinetic energy for one molecule at temperature T is given by [tex]\frac{3}{2}kT[/tex], where [tex]T[/tex] is the absolute temperature.
The kinetic energy of any gas is directly proportional to its absolute temperature (T).
Therefore, K.E. ∝ T
The translational kinetic energy of a gas is independent of the pressure, the molecular mass, or the nature of the gas. It depends only on the absolute temperature of the gas.
The absolute temperature of the sample with a volume 8.2L at -6°C is: [tex]T= 273-6 = 267K[/tex]
The absolute temperature of the sample with a volume 4.361L at 56.7°C is:[tex]T=273+ 56.7 = 329.7K[/tex]
As the absolute temperature of the second sample is more than that of the first sample.
Therefore, the average kinetic energy of the molecules of the 8.2L sample at 56.7°C is larger than that of the 4.361L sample at -6°C.
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I need help asap pleaseee
Answer:
4x10 4,000,000
8x10 80000
Explanation: FOr the problems i couldnt put the 6 and 4 so i just wrote it like that
an object in motion remain or an at rests remains at unless it is acted upon by an outside force is known as
Why might activated carbon be added to a sample during the recrystallization process?.
Activated carbon might be added to a sample during the recrystallization processt to absorb impurities causing the recrystallization solution to have incorrect color.
Recrystallization is a technique (process) used to purify chemicals by dissolving both the impurities and a compound in an appropriate solvent, either compound or impurities can be removed from the solution, leaving the other behind. During the recrystallization, the impurities must also be soluble in the solvent.
Activated carbon is a form of carbon (C) used to filter an impurities from the solutions. It is activated to have pores that increase the surface area available for adsorption.
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A sample of aluminum has a mass of 14.24 g and a volume of 5.27 cm3 . what is the mass of a 49.7 cm3 sample of aluminum?
The mass of a 49.7 cm3 sample of aluminum is 134.29 g.
What is the weight of aluminum in grams?A mole of Al atoms has a mass in grams that is numerically equivalent to aluminum's atomic mass. According to the periodic table, the atomic mass (rounded to two decimal points) of Al is 26.98, so 1 mol of Al atoms weighs 26.98 g.Aluminum has a molar mass of 27 grams per mole. As a result, 1 mole of aluminum weighs 27 grams. As a result, the total number of moles in 9 grams of aluminum is 9g/27g.mol-1 = 0.33 moles.Aluminum has a molar mass of 26.982 g/mol.An aluminum atom has 13 electrons arranged in a [Ne] 3s2 3p1 electron configuration, with three electrons beyond a stable noble gas configuration. As a result, aluminum's combined first three ionization energies are much lower than the fourth ionization energy alone.
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A piece of magnesium with a mass of 5.867 g was heated in a crucible which was open to the air. After the magnesium had combusted and allowed to cool down the product was found to have a mass of 8.956 g. Determine the empirical formula of the magnesium oxide formed.
The empirical formula of the magnesium oxide formed is MgO
Here given data is piece of magnesium with a mass = 5.867 g after the magnesium had combusted and allowed to cool down the product and mass = 8.956 g
The empirical formula is the simplest whole number ratio of atoms in a compound and the ratio of atoms is the same as the ratio of moles and when crucible react with magnesium and air means oxygen then magnesium reacts readily with oxygen in the air, to produce magnesium oxide then chemical reaction is written as follows:
2Mg + O₂ → 2MgO
and hence when it cool down automatically the mass of magnesium is more than 1st mass because in that oxygen of air are added and that's why MgO are made the empirical formula of the magnesium oxide formed is MgO
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Zinc oxide is found in ointments for the skin. what formula best describes this compound, which has zn as a doubly charged cation? group of answer choices
a. zn2o2
b. zno
c. zn2o
d. zn2o3
e. zno2
The correct answer is ZnO (Zinc oxide).
Zn is doubly charged because ,Zn has 2 valency or we can say that zn contain 2 valence electron and has capacity to donate two electrons to oxygen. Oxygen can gain two electron from zinc to form zinc oxide.
Zinc oxide is applied to soothe minor skin irritations such diaper rash, burns, and cuts. You can use some things as sunscreen.
Only apply this medication to the skin. Observe all usage instructions on the product's packaging or those provided by your doctor. Ask your physician or pharmacist if you have any queries. Take care not to get this medication in your eyes. If the drug does go in your eyes, thoroughly rinse them with water. Only use this medication externally. Take not by mouth means the oral route of this medication should not be prescribed.
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Please help. This has to be done soon and correct
What is undergoing reduction in the redox reaction represented by the following cell notation? ca(s) | ca 2 (aq) || h (aq) | h2(g) | pt
H+ (aq) undergone reduction in the reaction to form H2(g).
Cell reaction - ca(s) | ca 2 (aq) || h (aq) | h2(g) | pt
In above reaction we can say that ,
Ca(s) lost two e-(s) and became ca+2(aq), that means it is undergoing oxidation by losing to electrons.
In the above redox reaction, H+(aq) gains two electrons and undergone in the reaction to form H2(g), Thus here reduction takes place or we can say that H+ has undergone reduction.
Reduction occurs in the chemical reaction when addition of hydrogen or removal of oxygen takes place. Gaining of electron in the chemical reaction also referred as reduction.
Oxidation refers to the process when element looses it's electron or adding of oxygen or removal of hydrogen takes place.
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The ____________ of a protein is the sequence of amino acids that are attached together by ____________ bonds.
The primary structure of a protein is the sequence of amino acids that are attached together by peptide bonds.
Amino acids are the building blocks of proteins, and the primary structure of a protein is the sequence of amino acids that are attached together by peptide bonds. Peptide bonds are formed when the carboxyl group of one amino acid reacts with the amino group of another amino acid, and the resulting molecule is called a peptide.
The primary structure of a protein is important for its function, as it determines the three-dimensional structure of the protein. The three-dimensional structure of a protein is vital for its function, as it determines how the protein interacts with other molecules. Proteins are important for many biochemical processes in the body, such as metabolism, cell signaling, and DNA replication.
The primary structure of a protein can be altered by mutations, which are changes in the DNA sequence that encodes the protein. Mutations can be caused by environmental factors, such as UV light or chemicals, or they can be inherited. Inherited mutations are responsible for many genetic disorders, such as sickle cell disease and cystic fibrosis.
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sort the following statements as facts, theories or laws
We know that a fact is something that has been established to be true and does not need any kind of verification as it can be observed clearly and seen. A law is something that has gone through the rigorous process of scientific investigation and has been established to be true. A theory is an explanation for a scientific observation.
The Pacific Plate is moving at a rate of approximately 7 cm per year - FactSome diseases are caused by microorganisms that grow and reproduce in a living host - TheoryThe electrical current through a conductor is directly proportional to the voltage across the conductor - LawIn a closed system the sum of all momenta within the system is constant - LawLearn more about theories:https://brainly.com/question/14543764
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