The Ka value of a protonated base is the acid ionization constant. Which can be calculated from the concentration of H+ ion and the conjugate base. The ka value of protonated urea of the given pH is 7.92 ×10⁻¹⁵.
What is pH ?pH of a solution is the measure of its H+ ion concentration. It is says how much acidic or basic the solution is. If the pH value is 7, then the solution is neutral and if it is less than 7 the solution is acidic. pH value greater than 7 indicates that the solution is basic.
pH of a solution mathematically is the negative logarithm of H+ ion concentration. Given that the pH of urea solution is 7.050. Thus its H+ ion concentration is calculated as follows;
-7.050 = log [H+]
[H+] = antilog (-7.050)
= 8.9 × 10⁻⁸
Now when the protonated urea say it as HA is dissociated into its ions H+ and A-, then the ka value is written as;
[tex]Ka = \frac{[H+][A-]}{[HA]}[/tex]
Here, the [H+] and A- ion concentrations are equal and concentration of the solution HA is given 1 M.
Thus, Ka value of protonated urea can be calculated as follows:
Ka = (8.9 × 10⁻⁸)² / (1-[ 8.9 × 10⁻⁸])
= 7.92 ×10⁻¹⁵
Therefore, the acid ionization constant Ka of 1 M protonated urea with a pH of 7.050 is 7.92 ×10⁻¹⁵.
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11. How is the atomic emission spectrum of an element produced?
Answer:
Atomic emission spectra are produced when excited electrons return to the ground state. When electrons return to a lower energy level, they emit energy in the form of light.
Explanation:
please help ASAP thank you!
Answer:
it's C
Explanation:
the mitochondria makes energy for the cell so without it there's no energy for the cell
An engine overheats and causes a car to catch on fire- is this a physical or chemical property?
Answer:
physical
Explanation:
HAVE GREAT DAY!
If you assumed 100 total atoms in a sample, how could you relate the % values shown in the sim into a number you could use for your calculation of average atomic mass?
If you assumed 100 total atoms in a sample, you could relate the % values shown in the sim into a number you could use for your calculation of average atomic mass is
Average atomic mass = ∑ ( isotope mass × % of abundance )
To calculated the average atomic mass, we have to multiply the isotopes mass of each to the % abundance then add .
the formula for the calculation of average atomic mass :
Average atomic mass = ∑ ( isotope mass × % of abundance )
Thus, If you assumed 100 total atoms in a sample, you could relate the % values shown in the sim into a number you could use for your calculation of average atomic mass is
Average atomic mass = ∑ ( isotope mass × % of abundance )
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Write four components of a modern detergent and the uses of the components
The four main components of a modern detergent are builders (50% by weight), surfactants (15%), bleach (7%), and enzymes (2%).
What is the use of the components in the detergent?A detergent can be described as a surfactant or a mixture of surfactants with cleansing properties in dilute solutions. These substances are similar to soap but are more soluble in hard water due to the polar sulfonate is less likely than the polar carboxylate of soap to bind ions in hard water.
Builders are water softeners and their anions react with cations to form insoluble compounds which precipitate onto fabrics and washing machines and which are hard to remove.
Surfactants provide absorption and emulsification of soil into the water and also by reducing the surface tension of water to improve wetting. The main function of bleaches is oxidizable organic stains, which are usually of vegetable origin.
Enzymes are needed to degrade stubborn stains composed of proteins, fats, starch, and cellulose.
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naoh is hygroscopic, meaning it absorbs water from the air. you can measure the amount of water it absorbs by taking its mass before and after removing the water in an oven (by the difference in mass before and after). would you use an analytical or top-loading balance for this?
It is better to use the analytical balance for smaller amounts of sodium hydroxide (up to a couple of grams).
The sensitivity of the analytical balance goes to a couple of tenths of a milligram, while the sensitivity of a top-loading balance goes to tens of milligrams at best. The amount of water absorbed by sodium hydroxide is significant, but not too great relative to the mass of the sample. With this in mind, it is far more recommendable to use the analytical balance over the top-loading balance in order to be able to register the change in mass at all.
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I need HELP fast!!!
At the end of the video, the man getting interviewed provides an analogy about meditation and states of matter. Create your own analogy that explains the differences between the behavior of molecules in different states of matter. Explain.
The differences between the behavior of molecules in different states of matter is marathon runner
Molecule are made up of one or more atom and also the smallest particle of any substance which can exist independently and retain physical and chemical properties of the substances
They would be close to each other and are tightly packed like solid molecules and then the race was stared they were loosely packed compared to solid and then at the game reaches at the end point the players will be spread out and they would be more loosely packed compared to solid and liquids
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Which of the following is true of electronegativity?
a) Noble gases are the most electronegative group of the periodic table.
b) The fewer protons found in the nucleus, the greater the electronegativity.
c) It describes the affinity an atom has for an electron.
d) Electronegativity increases as atomic radius increases.
Answer:
c) It describes the affinity an atom has for an electron.
Explanation:
C quite literally describes what electronegativity is, you can rule out most others by looking at periodic trends as attached below.
you are going to measure the conductivity of the analyte beaker during a titration. initially, the beaker contains only aqueous mgcl2, which fully dissolves in water. generally, how many ions does each molecule of mgcl2 break into? group of answer choices
Each magnesium chloride (MgCl₂) molecule dissociates into 3 ions in total.
Magnesium chloride (MgCl₂) is a salt which means that, upon dissolving in water, it will dissociate, giving positively charged metal cations (here, magnesium ions) and negatively charged anions formed from nonmetals (here, chloride ions). The balanced reaction equation for magnesium chloride (MgCl₂) dissociation looks like this:
MgCl₂(aq) → Mg²⁺(aq) + 2Cl⁻(aq)
We can see that, upon dissociation, each molecule of magnesium chloride forms a single magnesium ion (Mg²⁺) and two chloride ions (Cl⁻). So, in total, 1 + 2 = 3 ions are formed from each unit of magnesium chloride.
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If an object that weighs 50 N displaces a volume of water that weighs 10 N,what is the buoyant force on the object?
10 N
Buoyant force is equal to the weight of the displaced fluid; acting in the upward direction.
Answer:We know that when a body is fully or partially submerged in a fluid,its weight is decreased and that amount of decrease is equals to the weight of the fluid displaced by it.
So,this apparent reduction of weight is due to the buoyancy force acting,which is equals to the weight of the fluid displaced by the body.
So,here the buoyancy force acting on the object is
10
N
Explanation:
if i have an unknown quantity of CI2 at a pressure of 1.2 atm, a volume of 31 liters and a temperature of 87C, how many moles of CI2 do i have
Answer:
I think 1.3 moles correct me if I'm wrong
Explanation:
How does one periodic trend connect a racial trend in American Society? Why is it important to understand racial trends in American Society?
A periodic trend connect a racial trend in American Society ad it affect the distribution of power, wealth, opportunity, and create enduring social stratifications.
It is important to understand racial trends in American Society as it helps in understanding the society better.
How to illustrate the information?A trend is a shift or progression toward something new or different. Global migration is one of the most significant developments nowadays.
Today, 244 million individuals live in nations other than their native countries, which is three times the number in 1960. The world's migrant population would be the sixth largest country.
It should be noted that among the issue of racial trend is also the issue of black lives matter. This is important in order to end discrimination and also enhance the development in the country.
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6. Classify the following as physical changes (PC), chemical changes (CC), physical properties (PP), and chemical properties (CP):
a. __An iron scorches a shirt when you leave it in one spot too long.
b. __ The tires on your car seem to be getting low in very cold weather.
c. __ Your grandmother's silver tea set gets black with tarnish over time.
d. __ Spray-on oven cleaner converts grease in the oven into a soapy material.
e. __ An ordinary flashlight battery begins to leak with age and can't be recharged.
f. __ Acids produced by bacteria in plaque cause teeth to decay.
g. __ Sugar chars if overheated while making homemade candy.
h. __ Hydrogen peroxide fizzes when applied to a wound.
i. __ Dry ice "evaporates" without melting as time passes.
The classification of the given processes as either physical changes (PC), chemical changes (CC), physical properties (PP), and chemical properties (CP): is as follows:
CC An iron scorches a shirt when you leave it in one spot too long.PC The tires on your car seem to be getting low in very cold weather.CC Your grandmother's silver tea set gets black with tarnish over time.CP Spray-on oven cleaner converts grease in the oven into a soapy material.CC An ordinary flashlight battery begins to leak with age and can't be recharged.CP Acids produced by bacteria in plaque cause teeth to decay.CC Sugar chars if overheated while making homemade candy.CP Hydrogen peroxide fizzes when applied to a wound.PP Dry ice "evaporates" without melting as time passes.What are physical and chemical changes?Physical changes are changes that occur in a substance that are easily reversible and only affect the physical properties of that substance.
In physical changes, no new substances are formed.
Some physical properties that may change in physical changes are color, taste, volume, mass, physical state, etc.
Chemical changes are changes that occur in a substance that are not easily reversible and which affect the chemical properties of that substance.
In chemical changes, new substances are formed.
Some chemical properties that may change in physical changes are oxidation state, combustibility, etc.
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A salvage yard contains a mixture of iron, glass, aluminum, and plastic. which property of iron does the salvage yard take advantage of when separating the iron from the rest of the materials?
Magnetic property of iron will help in seperating iron from rest of the materials.
Iron is a metal and have magnetic property. Magnetic property is property of metal in which metal has the attraction power to attract other metal. Iron is ferromagnetic but it requires certain temperature and certain conditions. It occurs below 770°C, which is curie temperature.
There are 5 magnetic properties
Property 1: Intensity of magnetisationProperty 2: Magnetic Field (H) or Magnetic intensity. Property 3: Magnetic susceptibilityProperty 4: RetentivityProperty 5: Coercivitytypes of magnetic materials
Diamagnetic Material,Paramagnetic Materials,Ferromagnetic Materials,Antiferromagnetic Materials,Ferrimagnetic Materials.
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Enzyme A is currently functioning at a temperature of 55 and a pH of 7. According to the information provided in the chart, select all factors that would increase the rate of function of enzyme A?
A
Increase the temperature to 70∘^{\circ}
B
Increase the pH with the addition of a base
C
Decrease the temperature to 40∘C
D
Decrease the pH with the addition of an acid
The factor that will increase the rate of the function of the enzyme A is increasing the temperature to 70°C (option A).
What is an enzyme?Enzymes are biological catalysts meaning that they regulate the rate of biochemical reactions in living cells.
Enzymes lower the activation energy of a reaction, which is the required amount of energy needed for a reaction to occur. Enzymes do this by binding to a substrate and holding it in a way that allows the reaction to happen more efficiently.
The factors that affect the rate of function of na enzyme are as follows:
TemperaturepHSubstrate concentrationEnzyme concentrationEach enzyme has an optimum pH range. This means that changing the pH outside of this range will slow enzyme activity, however, raising temperature generally speeds up a reaction, and lowering temperature slows down a reaction.
Therefore, the increase of temperature will increase the rate of function of the enzyme A.
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A chemist has a block of aluminum metal (density is 2.7 g/mL). The block weighs 1.9 g. What is the volume, in mL, of the aluminum block?
Answer: v = 0.70 ml
Explanation:
1. We can use the Density equation
(d = density (g/ml), m = mass (g), v = volume (ml))
D = m/v
2. Plug in what we have and solve for v.
2.7 = 1.9/v
v = 0.70 ml
suppose there is a gaseous mixture of nitrogen and oxygen. if the total pressure of the mixture is 490 mmhg , and the partial pressure of nitrogen is 210 mmhg , calculate the partial pressure of oxygen in the mixture using dalton's law.
The partial pressure of Oxygen in the mixture is 280 mmHg.
The Sum of the partial pressure of elements in a solution equals the total pressure of the mixture as stated by Dalton's Law.
Total pressure = Partial pressure of Nitrogen + Partial pressure of Oxygen
P' = P₁ + P₂
The partial pressure is the pressure that each gas would exert if it alone occupied the volume of the mixture at the same temperature.
The system responds to changes in pressure, temperature, and chemical composition, phases may be created, eliminated, or altered in composition.
∴ 490 = 210 + P ₂
P₂ = 280 mm of Hg
Hence, the partial pressure of oxygen gas is 280 mm Hg.
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how does hydrogenation affect unsaturated fats? a. it changes them so they are more water-soluble. b. it changes solid fats to trans fatty acids. c. it changes them to polyunsaturated fats as it removes hydrogen atoms. d. it adds antioxidants to them, creating a better-preserved product. e. it adds hydrogen atoms to their chains, making them more saturated.
Hydrogenation affects unsaturated fats by adding hydrogen atoms to their unsaturated chains and making them be more saturated.
What is unsaturation?Unsaturation in organic compounds is an indication of the presence of double or triple bonds in one or more C-C bonds in the structure of the compounds.
Saturated organic compounds do not have double or triple C-C bonds in them.
Unsaturated compounds, therefore, have the tendency to undergo addition reactions due to the presence of the double/triple bond.
Hydrogenation of unsaturated fats is an additional reaction. The hydrogen atoms attach themselves by pairing with the lone electron pairs in the double or triple bonds.
Thus, the addition of hydrogen makes unsaturated compounds to be more saturated.
Saturated compounds, on the other hand, can only undergo substitution reactions instead of addition reactions.
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Uranium-238 is an unstable nuclide that emits an alpha particle, three neutrons, and gamma particles. A = 231 and Z = 90. What daughter nuclide is formed from this reaction?
A) Ra
B) Th
C) Pu
D) Fr
The daughter nuclide that is formed from this reaction is Ra.
What is radioactivity?We define radioactivity as the spontaneous disintegration of the atom of a substance. We know that in the process of radioactivity there is the formation of daughter nucleus which are somewhat different from the given parent nucleus.
Now, we are told that, Uranium-238 is an unstable nuclide that emits an alpha particle, three neutrons, and gamma particles. Since we are told that there is an alpha decay then it means that the daughter nucleus is less than the atomic number of the parent by two units.
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True or false? First nations people along the west coast of british columbia used smelting technology to create copper plaques
First nations people along the west coast of British Columbia used smelting technology to create copper plaques is false.
Smelting process is the form of extractive metallurgy to produce a metal from its ore. it is the process of melting and separation of charges . it is extensive energy process. Plaques are made by pouring molten metal in to a mold. and when it gets cools , it solidified into a copper solid plaque. first nation people use copper as hunting weapons, spear tools etc. copper is metal.
Thus, First nations people along the west coast of British Columbia used smelting technology to create copper plaques is false.
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2NaOH + CO₂ = Na₂CO3 + H₂O
Is this equation balanced?
Balanced chemical equation :
A balanced equation is a chemical reaction equation in which the total charge and the number of atoms for each element in the reaction are the same for both the reactants and the products.
Given Equation :
[tex]2NaOH_{}[/tex] + [tex]CO_{2}[/tex] = [tex]Na_{2}CO_{3}[/tex] + [tex]H_{2}O[/tex]
Here, we have 2 sodium (Na) atoms, 4 Oxygen (O) atoms, 2 Hydrogen (H) atoms and 1 Carbon (C) atom on the left hand side of the equation (reactants).
Also we have 2 sodium (Na) atoms, 4 Oxygen (O) atoms, 2 Hydrogen (H) atoms and 1 Carbon (C) atom on the right hand side of the equation (products).
Hence , the given equation, [tex]2NaOH_{}[/tex] + [tex]CO_{2}[/tex] = [tex]Na_{2}CO_{3}[/tex] + [tex]H_{2}O[/tex] is a balanced chemical equation.
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help me please!
What pressure will be required for neon at 30°C to have the same density as nitrogen at 20°C and 1.0 atm?
Ideal gas law is valid only for ideal gas not for vanderwaal gas. Therefore, the pressure that will be required for neon at 30°C to have the same density as nitrogen at 20°C and 1.0 atm is 1.44atm.
What is ideal gas equation?
Ideal gas equation is the mathematical expression that relates pressure volume and temperature. There is no force of attraction between the particles.
Mathematically the relation between Pressure and temperature can be given as
P₁M₁=DRT₁
P₂M₂=DRT₂
Rearranging the two equation we get
P₁M₁÷T₁=P₂M₂÷T₂
where,
P = pressure
M= Molarity
D=density
T =temperature
R = Gas constant = 0.0821 L.atm/K.mol
Substituting all the given values, we get
(P₁×M₁)÷T₁=(P₂×M₂)÷T₂
(P₁×20)÷303=(1.0 ×28)÷293
P₁=1.44atm
Therefore, the pressure that will be required for neon at 30°C to have the same density as nitrogen at 20°C and 1.0 atm is 1.44atm.
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Select all the correct answers. what are three reasons why nebulae contribute more to stellar formation than other regions of the universe? they are rich in hydrogen and helium. they have an unlimited supply of hydrogen. they are far away from black holes. they are dense and hot. they have a strong gravitational pull.
Answer:
1 ) They are wealthy in gases hydrogen and helium. 2 ) They are very hot and dense . 3 ) They have a solid gravitational pull.
Explanation:
Space where huge size of gaseous and dust cloud is present is called nebula. It is mainly made of hydrogen and helium. Nebula exist in the space which is between the stars and it is call as interstellar space.
Helix nebula is closest nebula which is near the earth. It’s distance from earth is about 700 light years.
Dark nebulae are very dense as well as cold. Nebula can be divided into dark nebula and bright nebula. The gas which is present between the stars is always combine with solid grains cosmic dust.
Nebulae contribute more to stellar creation than other areas of the universe for the following three reasons:
They are abundant in helium and hydrogen.They are hot and thick.They are highly gravitationally drawn.So, the correct options are A, D and E.
What is Nebulae?Huge clouds of gas and dust known as nebulae are found in space and are made up of heavier elements in the form of dust particles as well as ionized gases like hydrogen and helium.
Because the gases and dust within them have the potential to collapse under the influence of gravity and form new celestial objects, they are frequently the birthplace of stars and planetary systems. They are rich in hydrogen and helium. They have a strong gravitational pull and are hot and dense.
Hence, the correct options are A, D and E.
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Select all the correct answers. what are three reasons why nebulae contribute more to stellar formation than other regions of the universe?
they are rich in hydrogen and helium. they have an unlimited supply of hydrogen. they are far away from black holes. they are dense and hot. they have a strong gravitational pull.The Dart Frog is a brightly colored frog. These bright colors could mean that this frog is poisonous, warning predators to stay away. Plants in the rainforest are normally crowded and have very little space. The big leaves of a Hosta Plant allow the plant to receive as much sunlight as possible when the sun is out.
What type of adaptations are these? Compare and contrast the adaptations of the Dart Frog and the Hosta Plant. Your answer should be 3–4 sentences long.
PLEASE HELP!! OPTIONS: LIFE CYCLE>PHYSICAL>BEHAVIORAL ADAPTION(ILL GIVE 20 POINTS!!)
The type of adaptation shown by the dart frog is physiological adaptation while the one shown by the Hosta plant is structural adaptation.
Types of adaptationAdaptation generally refers to the process by which living organisms adjust in order to continue to survive in an environment.
There are 3 main types of adaptations:
Behavioral adaptationsPhysiological adaptationsStructural adaptationsIn behavioral adaptation, organisms change their behavior for their continued survival in their environments. Without these modifications, they may find it to survive and reproduce in the environment.
Physiological adaptation refers to changes that are encoded into the system of organisms. Changes that are not behavioral nor structural but ensure the continued survival of organisms in their environment.
Structural adaptation refers to the modification of physical structures for continued survival. These modifications become necessary because the environment keeps changing.
Thus, bright coloration as a warning to predators by the dart frog is a physiological adaptation while the development of big leaves that ensures that as much sunlight as possible is received by the Hosta plant is a structural adaptation.
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help pleasee! will
give brainliest +80 pts
The name of the compounds of nonmetallic elements are:
GeH₄ - germanium tetrahydrideN₂Br₄ - dinitrogen tetrabromideP₂S₅ - phosphorus (v) sulfideSeO₂ - selenium (iv) oxideNH3 - ammoniaSiO₂ - silicon (iv) oxideThe formula of the binary compounds of nonmetallic elements are:
phosphorus triiodide - PI₃silicon tetrachloride - SiCl₄dinitrogen pentoxide - N₂O₅dinitrogen tetroxide - N₂O₄carbon monoxide - COThe formula of the compounds of nonmetallic elements are:
carbon dioxide - CO₂sulfur hexafluoride - SF₆dinitrogen tetrachloride - N₂Cl₄carbon tetraiodide - CI₄phosphorus pentafluoride - PF₅diphosphorus pentoxide - P₂O₅What are the formulas of compounds?The formula of compounds are formulas that are used to represent the compound.
The formula of compounds uses the symbols of the elements present in the compound to represent the compound.
The moles of atoms of each element present in the compound is written in subscripts in the formula of the compound.
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How many molecules are there in 4.00 moles of glucose, C6H1206?
Molecules in 4 moles of glucose are 24.088x10²³.
We need to find the number of molecules by applying the concept of moles
number of moles(n)= Number of Molecules(N)/Avogadro's Number(Nₐ)
n=N/Nₐ
4=N/6.022x10²³
N=24.088x10²³
Therefore, the number of molecules in 4 moles of Glucose is 24.088x10²³.
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Look at the diagram below. Which part, A-C, correctly shows the electronic structure of a sodium ion?
The correct diagram is C as it is the correct electronic configuration for Sodium ion
What is electronic configuration ?
The description of the positions of the electrons around a nucleus is called an electron configuration. As we previously discovered, every neutral atom contains an equal number of protons and electrons. Now, we'll arrange those electrons such that they stand around the nucleus in a way that shows their energy and the nature of the orbital in which they are housed.
Na ( Sodium )
Atomic Number - 11
Electronic Configuration : 2,8,1
Na+ ( Sodium ion)
Electronic Configuration : 2,8
The correct diagram is C as it is the correct electronic configuration for Sodium ion
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PLEAASE HELP
Solid aluminum reacts with aqueous zinc bromide to form solid zinc and aqueous aluminum bromide .
Write a balanced chemical equation for this reaction.
what mass of magnesium bromide is formed when one grams of magnesium reacts with 5 g of bromine
Taking into account the reaction stoichiometry, a mass of 7.57 grams of MgBr₂ is formed when one grams of magnesium reacts with 5 g of bromine.
Reaction stoichiometryIn first place, the balanced reaction is:
Mg + Br₂ → MgBr₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Mg: 1 moleBr₂: 1 moleMgBr₂: 1 moleThe molar mass of the compounds is:
Mg: 24.31 g/moleBr₂: 159.8 g/moleMgBr₂: 184.11 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Mg: 1 mole ×24.31 g/mole= 24.31 gramsBr₂: 1 mole ×159.8 g/mole= 159.8 gramsMgBr₂: 1 mole ×184.11 g/mole= 184.11 gramsLimiting reagentThe limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.
Limiting reagent in this caseTo determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 24.31 grams of Mg reacts with 159.8 grams of Br₂, 1 grams of Mg reacts with how much mass of Br₂?
mass of Br₂= (1 grams of Mg× 159.8 grams of Br₂) ÷24.31 grams of Mg
mass of Br₂= 6.57 grams
But 6.57 grams of Br₂ are not available, 5 grams are available. Since you have less mass than you need to react with 1 grams of Mg, Br₂ will be the limiting reagent.
Mass of MgBr₂ formedConsidering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 24.31 grams of Mg form 184.11 grams of MgBr₂, 1 grams of Mg form how much mass of MgBr₂?
mass of MgBr₂= (1 grams of Mg× 184.11 grams of MgBr₂)÷ 24.31 grams of Mg
mass of MgBr₂= 7.57 grams
Then, a mass of 7.57 grams of MgBr₂ can be produced.
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what is the purpose of using the Bohr model? what does this model shows . ?
i need helppp bro
Answer:
The purpose of a Bohr model is to show the atom(s) as a central nucleus; containing protons and neutrons with the electrons in circular orbitals at specific distances from the nucleus.
Explanation:
Have a great rest of your day
The one and only,
-Mr. Universe
In 1913 Bohr proposed his model of the atom , it's purpose was to explain how electrons can have stable orbits around the nucleus. It shows electrons orbiting the nucleus of an atom -He found that electrons farther away from the nucleus have more energy, meaning the electrons that are closer to the nucleus have less energy.
For example...(shows Bromine )
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