8.7M Is the solubility of Ca(oh)2 in water at a given Ksp of 6.5 .10-6 and molar mass of 74.09g/mol.
Solubility is defined as the amount of the substance dissolved in a given amount of solvent at a certain temperature.
Ca(OH)2 à Ca2+ + 2OH-
Ksp = 6.5 .10-6
Molar mass= 74.09 g/mol
Ksp is solubility product constant which describes the equilibrium between a solid and its ion in solution.
Ksp=[Ca2+] [OH2-]
6.5 .10-6 = S. (74.09g/mol +S)
6.5 .10-6 = S .( 74.09M)
S = 6.5 .10-6 /74.09 M
= 8.7 M
So, the solubility of Ca(OH)2 is 8.7M.
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(Digestion, Intestine, Bile)is secreted by the liver to help in the breaking down of food particles.
Answer:
Bile
Explanation:
Bile is secreted by the liver to help in the breaking down of food particles.
which ion has the largest radius and which ion has the smallest radius in an isoelectronic series? why?
K+ has the greatest nuclear charge (Z = 19), its radius is smallest, and S2− with Z = 16 has the largest radius.
What is atomic radius ?
Atomic radius is generally given as the total distance from the nucleus to the outermost orbital of an electron. Simply put, it can be defined as analogous to the radius of a circle, where the center of the circle is the nucleus and the outer edge of the circle is the outermost orbit of the electrons. As you begin to move or move down the periodic table, trends emerge that help explain how atomic radii change.
The net nuclear charge (Zeff) of an atom is the net positive charge experienced by the valence electrons. Not all of the positive charge is seen by valence electrons, as some of the positive charge is masked by core electrons. A detailed explanation of shields and effective nuclear charges can be found here. Zeff greatly influences the atomic size of an atom. So a decrease in Zeff results in an increase in atomic radius. This is because the electrons are more shielded from the nucleus and the attractive force between the nucleus and electrons is reduced. Zeff decreases from right to left down the periodic table down the group, so the atomic radius increases as the group moves down the periodic table from right to left.
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the karp-flatt metric helps to determine whether the decrease in efficiency is arsing due to higher serial fraction or parallel overhead.
By finding the serial fraction, we arrive to the aforementioned Karp-Flatt metric.
What is Karp-flatt metric ?A measure of code parallelization in systems with parallel processors is the Karp-Flatt metric. This metric exists in addition to Amdahl's law and Gustafson's law as a measure of the level of parallelization of a specific computer code. In 1990, Horace P. Flatt and Alan H. Karp made the suggestion.
The effectiveness of a parallel algorithm operating on a parallel processor can be evaluated in a variety of ways. The Karp-Flatt metric identifies a statistic that highlights performance characteristics that are difficult to identify from other metrics. Amdahl's Law has the following pseudo-"derivation," .
Note that the left hand side reflects a metric quantity rather than a quantity that was derived mathematically, indicating that this is not a "derivation" from Amdahl's law. The analysis above only demonstrates that the Karp-Flatt measure and Amdahl's Law are compatible.
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explain how nutrition hormones and exercise affect bone development and growth
Answer:
Explanation:
Numerous, controlled studies have demonstrated that people who exercise regularly have greater bone density than those who are more sedentary.
Any type of exercise will stimulate the deposition of more bone tissue, but resistance training has a greater effect than cardiovascular activities.
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When 0.4g of zinc trioxocarbonate (IV) reacted with dilute hydrochloric acid, zin chloride was produced and carbon (IV) oxide evolved if the reaction took 2minutes. What was the rate of the reaction
The rate of reaction when 0.4g of zinc trioxocarbonate (iv) reacted with dilute hydrochloric acid to produce zinc chloride and carbon (iv) in 2 minutes is 0.0016 mol/min.
What is the rate of a reaction?The rate of a reaction is the time taken for product molecules to appear or the time taken for reactant molecules to be converted.
Rate of reaction = moles of products formed/ time takenOr
Rate of reaction = moles of reactant converted / time takenThe equation of the reaction is given below:
ZnCO₃ (s) + 2 HCl (aq) ---> ZnCl₂ (aq) + H₂O (l) + CO₂ (g)
Molar mass of zinc carbonate = 125.39=8 g/mol
Moles of zinc carbonate converted = 0.4 / 125.38
Moles of zinc carbonate converted = 0.0032 moles
Time taken = 2 minutes
Rate of reaction = 0.0032/ 2
Rate of reaction = 0.0016 mol/min
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What are both names for the compound HNO₂?
(In the spaces provided, write out the complete names of the compound requested)
The name of this compound when not dissolved is type your answer...
The name of this compound when dissolved in type your answer…
Answer:
Explanation:nitrous acid
what is the primary difference between the oxidation of glucose to co2 by glycolysis and the citic acid cycle vs by the pentose phosphate
The primary difference between the oxidation of glucose to CO₂ by glycolysis and the critic acid cycle vs by the pentose phosphate is the glycolysis occurs in cytosol. to CO₂ is release of CO₂ is in mitochondria and in the pentose phosphate CO₂ is generated in the cytosol.
When the glucose oxidation takes place by glycolysis and the citric acid cycle , the total catabolism will occur. The energy is released and this energy is trapped in ATP. in this glucose is catabolizes. in pentose phosphate CO₂ is generated in the cytosol.
Thus, The primary difference between the oxidation of glucose to CO₂ by glycolysis and the critic acid cycle vs by the pentose phosphate is the glycolysis occurs in cytosol. to CO₂ is release of CO₂ is in mitochondria and in the pentose phosphate CO₂ is generated in the cytosol.
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what will the evaporation of water and the formation of sea ice do to the salinity of water? group of answer choices
The ocean's salinity is raised by both sea ice production and ocean water evaporation. Ongoing inflow of fresh water from the rivers, fall of rain and snow, and the melting of ice constantly balance.
Why is water salinity important?It makes a significant contribution to conductance and influences many elements of the biochemistry in groundwaters as well as the biological activities that take place there. Temperature, pressure, and salinity all influence the physical properties of water, including its density its heat capacity.
How is water salinity influenced?Seawater salinity is impacted by rains, ice development, melting, and drainage. Seawater evaporate, leaving behind salts, which enhances their concentration and raises the salt of the water.
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how do you think the phsyical properties (strength,flexibility, and viscosity) of the polymer would change if more borate ion had been added? why do you think that
The physical properties (strength, flexibility, and viscosity) of the polymer would change if more borate ion had been added is that it becomes thicker and the viscosity will decreases.
The reaction takes place when the borax is added to the solution. when we add the borax in the solution the glue and the borax will combine and form the new substance that is flexible and the springy. The physical properties like strength, flexibility and the viscosity would change.
Thus, The physical properties (strength, flexibility, and viscosity) of the polymer would change if more borate ion had been added is that it becomes thicker and the viscosity will decreases.
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how could you identify a pure metal if you have a balance, a graduated cylinder, and a table of densities for metals
You can find the mass and volume of the pure metal then compare the density with the table of densities to determine which metal.
Density is a term used to describe how tightly a substance is packed. It fits that criteria of mass per unit volume. Formula for Density or Density Symbol: D The formula is: = m/V where is the object's mass, m is its density, and V is its volume. The term "mass" is used to describe how much matter there is in a thing. Mass is often represented in kilogrammes (kg) or grammes (g) (kg). The most common units of mass measurement are kilogrammes (kg) and grammes (g). No matter where in the cosmos it is or how much gravitational force is exerted on it, mass is a measure of how much matter there is.
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Write the formulas of the following binary ionic compounds:
1) potassium arsenide
2) aluminum oxide
3) zinc iodide
4) scandium selenide
5) beryllium chloride
6) strontium phosphide
7) silver oxide
8) lithium sulfide
calculate the density of a solid substance if a cube measuring 2.02 cm on one side has a mass of 101 g.
The density of the solid substance if a cube measuring 2.02cm on one side having a mass of 101g is 12.254g/cm^3.
What is meant by density?
Density can be defined as the relationship between mass of a substance and volume of that substance. Density explains how tightly the atoms in a substance is packed together.
Density of the substance can be calculated by dividing mass by volume of the substance.
Volume of the cube = LxBxH = 2.02cm x 2.02cm x 2.02cm = 8.242 cm^3
Density = mass/volume = 101g/8.242cm^3 = 12.254 g/cm^3
Therefore, the density of the solid substance if a cube measuring 2.02cm on one side having a mass of 101g is 12.254g/cm^3.
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How do you find Mass number
Answer:
Together, the number of protons and the number of neutrons determine an element’s mass number: mass number = protons + neutrons. If you want to calculate how many neutrons an atom has, you can simply subtract the number of protons, or atomic number, from the mass number. A property closely related to an atom’s mass number is its atomic mass.
Explanation:
would you expect the dissolved oxygen levels in water sampled from a stream entering a lake to be higher or lower than the dissolved oxygen levels in water sampled from the lake itself? explain why.
I would expect the dissolved oxygen levels from wаter entering а lаke to hаve lower thаn the lаke itself becаuse the steаm is аble to hаve wаrm wаter which cаn cаuse the lаke temperаture to be wаrm аlso. Hаving wаrm wаter meаns hаving less dissolved oxygen.
What is the dissolved oxygen level?Dissolved oxygen (DO) is the аmount of oxygen thаt is present in wаter. Wаter bodies receive oxygen from the аtmosphere аnd from аquаtic plаnts. Running wаter, such аs thаt of а swift moving streаm, dissolves more oxygen thаn the still wаter of а pond or lаke. Heаlthy wаter should generаlly hаve dissolved oxygen concentrаtions аbove 6.5-8 mg/L аnd dissolved oxygen sаturаtion between аbout 80-120%.
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How many atoms thick is graphene?
One atom thick film of carbon known as graphene is 200 times stronger than steel and one hundred times thinner than a sheet of paper.
How thick is a graphene atom?1 atom thick
Pure carbon atoms are arranged in a hexagonal lattice in a single layer to form graphene, which is held together by sp2 bonds. Graphite is composed of layers of graphene. The thinnest material known to exist is graphene, which measures one atom thick (0.345Nm). Actually, it is two-dimensional.
A hexagonal honeycomb lattice securely holds a single layer (monolayer) of carbon atoms together to form graphene. It is an allotrope of carbon with sp2-bonded atoms arranged in a plane and a molecular bond length of 0.142 nanometers.
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Which best explains how the chemical reaction shown below follows the law of conservation of mass? 2H2 + O2 → 2H2O
The given equation is showing the law of conservation of mass as the number of hydrogen and oxygen atoms are same on the both sides of the equation.
What is the chemical equation?A chemical equation can be described as the representation of a reaction in terms of chemical symbols of the substances. A chemical equation possesses of participating reactants in the reaction, formed products, and an arrow representing the direction of the chemical reaction.
The chemical equation in which the number of atoms of each element is equal on either side of the equation is called a balanced chemical equation.
The law of conservation of mass obeys by every balanced chemical equation. By following law of conservation, the total mass of the chemical elements on the reactant side should be equal to the total mass of chemical elements on the product side in a balanced chemical equation.
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an atom of hydrogen consists of an electron of mass in circular orbit at uniform speed v. the orbital radius is
An electron of mass travelling in a circular orbit with a constant speed of v makes up a hydrogen atom. The orbital radius is 5*10^- 11 meters. The lepton particle family's first generation includes electrons.
In a hydrogen atom, the electron orbits the nucleus in a circle with a radius of 5*10^- 11 metres. It lasts for 1.5*10^16 seconds. The electron motion is accompanied by a current (electromagnetic charge: 1.6*10^19 C).
The electron is a subatomic particle with the symbol e or and an electric charge of one elementarily negative charge of hydrogen atom. Because they are thought to be elementary particles and do not have any known components or substructure, electrons are part of the first generation of the lepton particle family.
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hydrochloric acid reacts with many metals to form hydrogen gas and the corresponding metal chloride. if you needed to produce hydrogen gas as a source of fuel, and given a choice of na, mg, al, or zn as the metal, which one would you choose to maximize the amount of hydrogen gas produced per gram of metal?
Magnesium would be chosen to produce the hydrogen gas .
What is Chemical reaction ?
There are chemical reactions taking place all around us. Nothing could be further from the reality, despite the fact that we occasionally link chemical processes with the sterile surroundings of the test tube and the lab. A staggering, nearly incomprehensible variety of new substances and energy changes actually result from the enormous number of alterations that occur in our environment every second of every day.
Chemical reactions happen whether or not you want them to in nature, where they can be considerably less controlled than in a lab. They can also be more messier. Whether it be a forest fire that is blazing.
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Chemical reactions are categorized as endothermic or exothermic, based upon the energy changes that occur during the reaction.
Describe these two types of reactions.
Explanation:
In an endothermic energy, energy is taken into the reaction system from the surroundings whereas, in an exothermic reaction energy is released out as thermal energy.
when 2 moles of react with to form according to the following equation, 799 kj of energy are evolved. is this reaction endothermic or exothermic? endothermic what is the value of ?
The given question is incomplete and the complete question is
When 2 moles of Fe(s) react with Cl2(g) to form FeCl3(s) according to the following equation, 799 kJ of energy are evolved. Is this reaction endothermic or exothermic and What is the value of q
When 2 moles of Fe(s) react with Cl2(g) to form FeCl3(s) according to the following equation, 799 kJ of energy are evolved then the reaction is exothermic reaction and the value of q is -1598 kJ
Mole is the amount of substances of a specified elementary entity
2 moles of Fe(s) react with Cl2(g) to form FeCl3(s)
Energy = 799 kJ
We have to calculated reaction endothermic or exothermic = ?
The value of q = ?
So according to the reaction 799 kJ of energy are evolved it means that the enthalpy is negative as the reactant have more energy than the product and which means this is an exothermic reaction
And here we know that enthalpy of reaction is -799kJ/mol and considering the reacted 2 mole of solid iron then
q = 2 mol×-799kJ/mol
q = -1598 kJ
-1598 kJ energy are evolved when 2 mole of solid iron is react
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Would you expect the equivalence point ph of the wasb to be slightly acidic, neutral, or slightly basic? how does this compare to the sasb equivalence point ph?.
the WASB has a slightly acidic equivalence point and SASB has a slightly basic equivalence point. This is because WASB has a higher concentration of hydronium ions than SASB.
Hydronium ions play an important role in acid-base reactions. It is the hydrogen ion that is released or taken up in the acid-base reaction. The higher the concentration of hydronium ions, the more acidic the solution. In an acid-base reaction, an acid donates a hydrogen ion to a base. Bases accept hydrogen ions. This creates new water molecules. The equivalence point is the point at which an acid and a base react with 1:1 ratio. At this point the solution is neutral. If the acid has a higher concentration of hydronium ions than the base, the equivalence point is slightly acidic. This is due to the presence of more hydronium ions than at the start of the reaction. If the base has a higher concentration of hydronium ions than the acid, the equivalence point is slightly basic.
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The type of radioactive decay that releases only energy in order to become stable is
A. gamma decay
B.beta decay
C.electronic decay.
D. alpha decay.
Answer: B Is the answer
Explanation: I just did this
which of the following statements is false when performing an ultrasonic scaling during routine dental prophylaxis? a. the ultrasonic scaler should be grasped like a pencil. b. the side of the instrument should be used against the tooth rather than the tip. c. the ultrasonic scaler can be used for supragingival scaling only. d. the ultrasonic scaler should not be on the tooth form longer than 10-15 seconds at a time.
The claim that an ultrasonic scaler can be utilized for both supragingival and subgingival scaling during routine dental prophylaxis is untrue.
What do you mean by dental prophylaxis?During a dental prophylaxis, the teeth are given a thorough cleaning. Prophylaxis is a crucial dental technique for halting the spread of gingivitis and periodontal disease.
Periodontal disease and gingivitis can be brought on by bacteria from plaque that colonize on gingival (gum) tissue above or below the gum line. The body's continuing inflammatory response is brought on by these bacterial colonies' extreme inflammatory reactions and irritation. As the body starts to gradually erode bone and gum tissue, the teeth might shift, become unstable, or even fall out totally. There are more bacteria in the deeper pockets that develop between the gums and teeth.
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The carbon cycle is normally self-regulating; it keeps itself constant. The amount of carbon dioxide kept in the oceans, locked in rocks and in the air is
ANSWER
over time.
for the following reaction, 4.54 grams of hydrogen gas are allowed to react with with 8.84 grams of ethylene (c2h4). hydrogen (g) ethylene (c2h4) (g) ethane (c2h6) (g) what is the maximum amount of ethane (c2h6) that can be formed? grams
Maximum amount of ethane formed is 9.47660606 grams .
What is Chemical reaction ?
There are chemical reactions taking place all around us. Nothing could be further from the reality, despite the fact that we occasionally link chemical processes with the sterile surroundings of the test tube and the lab. A staggering, nearly incomprehensible variety of new substances and energy changes actually result from the enormous number of alterations that occur in our environment every second of every day.
Chemical reactions happen whether or not you want them to in nature, where they can be considerably less controlled than in a lab. They can also be more messier. Whether it be a forest fire that is blazing.
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a sample of he gas has a volume of 322 ml and a pressure of 0.9 atm. what will be the pressure, in atm, if the sample of helium is compressed to 125 ml?
The pressure, in atm, if the sample of helium is compressed to 125 ml is 2.32 atm
An ideal gas is a theoretical gas composed of many randomly transferring factor particles that aren't difficult to interparticle interactions. the best gasoline idea is beneficial because it obeys the precise gas law, a simplified equation of country, and is amenable to evaluation under statistical mechanics.
Volume is a degree of occupied three-dimensional space. it's far more frequently quantified numerically the usage of SI-derived gadgets or by way of diverse imperial gadgets. The definition of length is interrelated with the extent.
Using the ideal gas equation:-
At constant temperature
Given;
P₁ = 0.9 atm
V₁ = 322 ml = 0.322 L
P₂ = ?
V₂ = 125 ml = 0.125 L
P₁V₁ =P₂V₂
P₂ = P₁V₁ /V₂
= 0.9 × 0.322 /0.125
= 2.32 atm
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Which statement correctly describes a chemical
reaction at equilibrium?
A.
B.
C.
D
The concentrations of the products and
reactants are equal.
The concentrations of the products and
reactants are constant.
The rate of the forward reaction is less than
the rate of the reverse reaction.
The rate of the forward reaction is greater
than the rate of the reverse reaction.
Answer: The concentrations of the products and
reactants are equal.
Explanation:
an 11.0 gram sample of cacl2 is dissolved in 125 g of water with both substances at 25.0 c. calculate the final tmeperature of the solution assuming no heat lost to the surroundings and assuming the solution has a specific heat capacity of 4.18j/gc
40.4 C
So far q(rxn) = q(water) + q(CaCl2) (136g)(4.184J/°Cg)(Tfinal - 25.0°C) = (125g)(4.184)(Tfinal - 25.0°c) + (11g)c(Tfinal - 25.0°C).
The specific heat capacity is measured in J/(kg K) or J/(kg °C), and it is the amount of heat (J) absorbed per unit mass (kg) of the material when its temperature rises by 1 K (or 1 °C).The average kinetic energy of the atoms or molecules in the system is measured by temperatures. The zeroth law of thermodynamics states that when two objects are in thermal equilibrium, no heat is transferred between them, resulting in an equalisation of their temperatures.
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gas of unknown molecular mass was allowed to effuse through a small opening under constant pressure conditions. it required 57 s for 1.0 l of the gas to effuse. under identical experimental conditions it required 26 s for 1.0 l of o2 gas to effuse. calculate the molar mass of the unknown gas.
The molar mass of the other gas is 153.79 g/mol
Step 1: The Data given,
It required 57 s for 1.0 L of the gas to effuse.
Under identical experimental conditions it required 26 s for 1.0 L of O2 gas to effuse.
Step 2: Calculate the molar mass
Graham's law of effusion says:
r1/r2 = √(M2/M1)
⇒ with r1 = effusion rate 1 = L/57s
⇒ with r2 = effusion rate 2 = L/26s
⇒ with M1 = molar mass of the gas = x g/mol
⇒ with M2 = molar mass of oxygen = 32 g/mol
We should be careful if we plug in the effusion rate. Because the fractions could flip if we don't give the effusion rates as numeral values.
(L/57s)/(L/26s) = 26/57 = √(32/M1)
26/57 =√(32/X)
(26/57) ² = 32/X
0.208064 =32/X
X = 32/0.208064
X = 153.79 g/mol
Hence, The molar mass of the other gas is 153.79 g/mol
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A sample of 0.195g of potassium was added to 500cm3 of cold water. When the reaction was finished, 100cm3 of 0.100 mol/dm3 hydrochloric acid was added to form solution X.
i. Calculate the number of moles of hydroxide ions formed when the potassium was added to water.
ii. Calculate the number of moles of hydrogen ions in 100 cm3 of 0.100 mol/dm3 hydrochloric acid.
iii. Write a balanced equation for the neutralization reaction.
iv. Suggest a pH value for solution X. Explain your answer.
The calculations about the neutralization reaction show that;
1) hydroxide ions has a concentration of 0.0025 M
2) The amount of the HCl is 0.01 moles
3) The reaction equation is; [tex]KOH (aq)+ HCl(aq) ----- > H_{2} O (l)+ KCl(aq)[/tex]
4) The pH of the solution is 7.
What is the reaction?We know that the addition of the potassium to the water is going to lead to a reaction that would produce potassium hydroxide as one of the products of the reaction as we can see it; [tex]2K(s) + 2H_{2} O(l) ---- > 2KOH(aq) + H_{2}(g)[/tex]
Number of moles of the potassium used = 0.195g/39 g/mol
= 0.005 moles
Since we produced 0.005 moles of hydroxide ions, the concentration of the hydroxide ions is; 0.005 moles * 500/1000 L = 0.0025 M
ii) Number of moles of the hydrogen ions = Concentration * volume
= 0.1 * 100/1000
= 0.01 moles
The balanced reaction equation of the neutralization reaction is given by;
[tex]KOH (aq)+ HCl(aq) ----- > H_{2} O (l)+ KCl(aq)[/tex]
The pH of the solution ought to be seven.
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