the pH at the equivalence point in the titration of 25.6 ml is.
=12×14+12×3.74+12log 0.1=8.37.
What does the ph at equivalency point formula mean?The weak acid salt hydrolysis determines the pH at the equivalence point in the titration of weak acid with strong base.As a result, we must determine the pKb of the conjugated base, compute the concentration of OH- beginning from there, and then utilize the pH=14-pOH formula.
Why is pH of the equivalency point 7?The pH at the equivalence point is more than 7 in a weak acid/strong base titration.This is because the mixture contains water, the neutral cation of a strong base, and the anion of a weak acid (a base).
To know more about hydroxide solution visit:
https://brainly.com/question/21904397
#SPJ4
Explain the equation =
CH4 + O2 --> CO2 + 2H20.
Explanation:
The equation describes the combustion of methane (CH4). Methane burns in oxygen (O2) to produce carbon dioxide and water.
The equation is also not balanced. O2 should have a coefficient of 2.
describe the form of the equilibrium constant expression in terms of the concentrations of the reactants and products
The equilibrium constant, Kc, is the ratio of the equilibrium concentrations of products over the equilibrium concentrations of reactants each raised to the power of their stoichiometric coefficients.
For a reaction: aA + bB→ cC + dD
Equilibrium constant: Kc=[tex][C]^{c}[D]^{d}[/tex]/ [tex][A]^{a} [B]^{b}[/tex]
Characteristics of Kc:
1) Equilibrium can be approached from either direction.
2) Kc does not depend on the initial concentrations of reactants and products.
3) Kc does depend on temperature.
Magnitude of Kc:
1) If the Kc value is large (Kc >> 1), the equilibrium lies to the right and the reaction mixture contains mostly products.
2) If the Kc value is small (Kc <<1), the equilibrium lies to the left and the reaction mixture contains mostly reactants.
3) If the Kc value is close to 1 (0.10 < Kc < 10), the mixture contains appreciable amounts of both reactants and products.
To know more about stoichiometric coefficients here
https://brainly.com/question/19202467
#SPJ4
Lab: Reaction Rate - Assignment: Lab Report
PLEASE HELP ME ALREADY OVER DUE
QUESTION IS WORTH 100 POINTS
Answer:
I can’t give a good answer
Explanation:
there’s nothing to answer
what gas has increased in our atmosphere from 300 parts to 410 parts since 1950: 1) nitrogen, 2) carbon dioxide, 3) oxygen, 4) political hot air.
Gas that has increased in our atmosphere from 300 parts to 410 parts since 1950 is : 2) carbon dioxide (CO₂). It first exceeded 300 parts per million threshold in the 1950s and today it is over 410 parts per million.
What gas has increased in our atmosphere ?The concentration of carbon dioxide in the atmosphere is currently nearly 412 parts per million. This shows a 47 percent increase since the beginning of the Industrial Age when the concentration was nearly 280 ppm.
The atmospheric level of carbon dioxide has been rising since the 1960's. In 2021, atmospheric carbon dioxide levels reached 416.45 parts per million in comparison to 1960 levels which was 316.91 parts per million.
To know more about carbon dioxide, refer
https://brainly.com/question/14445045
#SPJ4
Which period of the periodic table is comprised entirely of elements with no known stable isotopes?.
The period in periodic table, in which no stable isotopes exists is the 7th period. They contains the actinides.
Actinides are 7th period elements that belong in the periodic table's f block. Vertical columns named groups and horizontal rows called periods make up a periodic table. Based on their shared characteristics with other group members, each element is categorized into appropriate groupings.
The periodic table has four blocks: the s, p, d, and f blocks. Metals make up the s block, transition metals are found in the d block, and non-metals including gases and metalloids are found in the p block.
Metals of the f-block are actinides. The period's elements are all radioactive. They lack a stable isotope or ion as a result. By emitting charged particles, they continue to decay radioactively.
Therefore, the period containing the unstable isotopes is 7th one.
To know more about actinides, please refer :
brainly.com/question/5188867
#SPJ4
What is the difference between changing a subscript in a chemical formula and changing a coefficient?.
Answer:
The coefficient is the number of molecules and the subscript is the number of atoms
Explanation:
You can change the coefficient to balance an equation but, never touch the subscript. It cannot be changed.
what is the ph of a solution prepared by mixing 25.00 ml of 0.10 m methylamine, ch3nh2, with25.00 ml of 0.10 m methylammonium chloride, ch3nh3cl? assume that the volume of thesolutions are additive and that kb
10.464 is the ph of a solution prepared by mixing 25.00 ml of 0.10 m methylamine, ch3nh2, with25.00 ml of 0.10 m methylammonium chloride, ch3nh3cl.
Is methylammonium chloride and methylamine a buffer?Methylamine and its conjugate acid, methylammonium chloride, are delivered to the buffer system. Since methylamine is a weak base, the pH of the buffer solution was requested. Thus, a buffer solution with 0.20 M methylamine and 0.15 M methylammonium chloride has a pH of 10.77.
Because H+ ions are produced during hydrolysis of CH3NH3+ ions in aqueous solution, the solution is acidic.
used in the production of rubber chemicals, medicines, pesticides, paint removers, and surfactants. A colourless to yellowish aqueous solution of a gas is how methylamine appears in aqueous solution. As the vapour concentration rises, the smell might be anything from fishy to ammonia-like.
Learn more about Methylamine refer
https://brainly.com/question/9758686
#SPJ4
Calcium carbonate reacts with hydrochloric acid:
CaCO3 + 2HCl →→ CaCl2 + CO2 + H2O
Calculate the number of moles of
hydrochloric acid required to react exactly
with 5g of calcium carbonate.
Answer:
0.1 mole
Explanation:
According to the formula, 1 mol of CaCO3 will require 2 mol of HCl
Molar mass of CaCO3 = 40.08 + 12.01 + 3(16.00) = 100.09 g/mol
so the 5g of CaCO3 equals : 5g x (1 mol/100.09g) = 0.0499 or 0.05 mol
so the mole of HCl required is: 0.05 x 2 = 0.1 mol
A property of matter that creates force between objects
Answer:
electric charge
Explanation:
Electric charge is a physical property of matter that imparts a force on charged matter when placed in an electromagnetic field. Charge can be positive or negative (typically carried by protons and electrons, respectively). Similar charges repel and dissimilar charges attract.
Answer:Electric Charge I hope this helpful
Explanation:
Electric Charge. Electrical property of matter that creates electric/magnetic forces and interactions.Electric charge is a physical property of particles or objects that causes them to attract or repel each other without touching. All electric charge is based on the protons and electrons in atoms. A proton has a positive electric charge, and an electron has a negative electric charge.
What are the correct coefficients?
_____ H2 + _____ O2 >>>> _____ H2O
Answer: __2__ H[tex]_2[/tex] + __1__ O[tex]_2[/tex] >>>> __2__ H[tex]_2[/tex]O
Explanation:
To balance this equation, we must be sure that the amount of H [hydrogen] and O [oxygen] is the same on both sides. I will be using, and showing, a method my teacher showed me to help us solve.
First, we will write out what we have:
_____ H[tex]_2[/tex] + _____ O[tex]_2[/tex] >>>> _____ H[tex]_2[/tex]O
H 2 >>>> H 2
O 2 >>>> O 1
Then, we see that the O [oxygen] is unbalanced. We will use a coefficient of 2 to balance them. Then, we will multiply this through and see what we now have on the right side, the product.
_____ H[tex]_2[/tex] + _____ O[tex]_2[/tex] >>>> __2__ H[tex]_2[/tex]O
H 2 >>>> H 4
O 2 >>>> O 2
Next, now we see the H [hydrogen] is unbalanced. We will use a coefficient of 2 to balance them. Again, we will multiply it through to see what we have on the left side, the reactants.
After this, the equation is balanced and we have our answer.
__2__ H[tex]_2[/tex] + __1__ O[tex]_2[/tex] >>>> __2__ H[tex]_2[/tex]O
H 4 >>>> H 4
O 2 >>>> O 2
There are problems with using information about CO₂ emissions by fossil fuels to draw
conclusions about the effect of carbon dioxide emissions on global sea levels.
Suggest what these problems are.
When fossil fuels are burned, they release large amounts of carbon dioxide, a greenhouse gas, into the air.
What is Greenhouse gas ?
The gases that trap heat in the earth's atmosphere are referred to as greenhouse gases (GHGs). The earth's surface warms during the day when the light beams through the atmosphere.The earth's surface cools at night, redistributing heat into the atmosphere. However, part of the heat is captured by the atmosphere's greenhouse gases.Any gaseous substance in the atmosphere that has the ability to absorb infrared radiation and retain heat in the atmosphere is considered a greenhouse gas.The greenhouse effect, which ultimately results in global warming, is caused by greenhouse gases increasing the heat in the atmosphere.Almost all of the rise in greenhouse gases in the atmosphere over the past 150 years can be attributed to human activity.To learn more about Greenhouse gas refers to
https://brainly.com/question/20349818
#SPJ1
if atmospheric greenhouse gas concentrations were held constant at their present levels today, how would the atmosphere and ocean respond?
Answer:
Global average temperatures and sea level would stay the same due to there being no change in atmospheric greenhouse gasses.
if matter cant be created nor be destroyed so how was the universe was formed
Answer: By the very laws of the universe, matter cannot be created or destroyed, the Big Bang cannot have happened by its own power. There was a creator involved.
A student has 20.0ml of 6.96 M CaCl2 solution the student adds water si the final volume of the solution is 250.0mL determine the new molarity of the solution
thermohaline circulation is driven by: group of answer choices the coriolis effect. longitude. density differences. wind. latitude.
thermohaline circulation is driven by: density differences
Mass per unit volume is measured using the density unit. Given that it is an intense property, the size of the item has no bearing on the value of the property. Density Physics-related meaning The mass-to-volume ratio of an object is known as its density in physics. Mass per unit volume is a frequent definition. Chemistry's use of density The density of a substance in chemistry is a measurement of how much mass there is per unit volume. It is a physical characteristic that is intense, which means that the size of the object has no bearing on its value.
thermohaline circulation is driven by: group of answer choices the coriolis effect. longitude. density differences. wind. latitude.
Learn more about density here:
https://brainly.com/question/29775886
#SPJ4
what six compounds would you propose making to explore these factors? can you think of anything else you would explore? draw the six compounds here. g
The six main compounds that we should explore are carbohydrates, lipids, proteins, nucleotides, fats, and water.
In chemistry, a compound is described as a substance that is made up of two or more different chemical elements combined in a fixed ratio. When the elements come together, they react with each other and form chemical bonds to form a chemical compound that are difficult to break.
Compound is mainly classified into two groups ionic and molecular. The compound which contains ionic bond between its constituent elements is known as ionic compound whereas the compound which contains covalent bond between its constituent elements is known as covalent compound.
Learn more about compounds from the link given below.
https://brainly.com/question/13516179
#SPJ4
Please help I will mark brainiest . When a student reacted 200. grams of aluminum chloride with calcium, she
produced 39.8 g of Al. What was her % yield?
P4 +KCIO3 →→ KCI +
KCI + P₂O5
-
Balance equation
Answer: 3P4 + 10KCIO3 → 10KCI + 6P2O5
Explanation:
Answer:
3 P₄ + 10 KClO₃ -----> 10 KCl + 6 P₂O₅
Explanation:
Remember, the reactants are the species taking part in the reaction (left side) and the products are the species being created (right side). An equation is balanced when there is an equal amount of each element on both sides of a reaction. If the amounts are unequal, you can modify them by adding coefficients to change the quantity of particular compounds/molecules.
Unbalanced Equation:
P₄ + KClO₃ -----> KCl + P₂O₅
Reactants: 4 phosphorus, 1 potassium, 1 chlorine, 3 oxygen
Products: 2 phosphorus, 1 potassium, 1 chlorine, 5 oxygen
Balanced Equation:
3 P₄ + 10 KClO₃ -----> 10 KCl + 6 P₂O₅
Reactants: 12 phosphorus, 10 potassium, 10 chlorine, 30 oxygen
Products: 12 phosphorus, 10 potassium, 10 chlorine, 30 oxygen
Use the given reactions to answer question 4.
Zn + Cu(NO3)2 → Zn(NO3)2 + Cu
Zn + Pb(NO3)2 → Zn(NO3)2 + Pb
Zn + NaNO3 → No Reaction
Pb + Cu(NO3)2 → Pb(NO3)2 + Cu
Which of these ranks the metals from most reactive to least reactive?
Cu(NO3)2 + Zn + Cu Zn (NO3) From most reactive to least reactive, metals are represented as 2 + Cu.
A is the ideal answer.
What are the four metals that are most reactive?Explanation: Lithium, sodium, potassium, potassium, rubidium, cesium, and francium are alkali metals (Fr). The metals become more reactive as you proceed down the column because the nucleus gains more electrons and protons (more electron levels), reducing the electrostatic force of the metals.
An example of a reactive metal?Reactive Metal: What Does That Mean? A class of metal elements known as reactive metals can react with acids, water, mineral acids, and potent oxidizing acids. This group can be recognized using the activity or reactivity series, which ranks the most reactive metals in order of increasing reactivity.
To know more about reactive metal visit:-
https://brainly.com/question/20570629
#SPJ1
Chlorine and hydrogen are combined and exposed to direct sunlight. Once exposed the chlorine and hydrogen explode and produce hydrogen chloride gas.
a. Rewrite the chemical reaction as a word equation
b. State the evidence that a chemical reaction has occurred
c. Is the reaction exothermic or endothermic? Explain your reasoning.
a. The chemical reaction can be rewritten as a word equation as follows:
Chlorine + Hydrogen -> Hydrogen Chloride + Explosion
b. Evidence that a chemical reaction has occurred includes the production of a new substance (hydrogen chloride gas), the release of energy (explosion), and a change in the physical properties of the reactants (change in color, odor, or temperature).
c. The reaction is likely exothermic, which means it releases energy. This is because the reaction produces a new substance (hydrogen chloride gas) and releases energy in the form of an explosion. In an endothermic reaction, the reactants would absorb energy from the surroundings.
n a titration lab experiment, 8.30 ml of 0.500 m hcl solution was found to neutralize 25.0 ml of sodium hydroxide, naoh. what is the concentration of naoh?
The concentration of naoh =0.166M
What exactly is concentration?The quantity of solute that has been dissolved in a certain volume of solvent or solution is measured by the solution's concentration. A solution that contains a significant amount of dissolved solute is said to be concentrated. A solution is said to be dilute if it only contains a little quantity of dissolved solute.
Given some titration data, we are asked to determine the molar concentration of the NaOH solution.
Let's start by formulating the reaction's chemical equation:
NaOH(aq) +HCl(aq) → NaCl(aq)+H2O(l)
Using the molarity equation, we can find the number of moles of
HCl that reacted:
molarity =mol solute/L soln
mol solute=(molarity)(L soln)
mol HCl = (0.500mol/L) (0.00830L) = 0.00415molHCl
(volume converted to liters)
Now, using the coefficients of the chemical reaction, we can determine the number of moles of
0.00415 mol HCl (1lmol NaOH)/(1mol HCl) =0.00415 mol NaOH
Lastly, we'll use the molarity equation (using given volume of NaOH soln) again to determine the molarity of the sodium hydroxide solution:
molarity = mol solute/Lsoln
M(NaOH)=0.00415 mol/O.O250L = 0.166M
The concentration of naoh =0.166M
To know more about concentration click:
brainly.com/question/29276511
#SPJ4
why do adults make a bigger splash when they jump into the swimming pool
Assume that all the copper in your trial reacts because there is plenty of silver nitrate available. How much silver would be produced?
If all the copper in the trial reacts, then the amount of silver produced would be equal to the amount of copper present.
What is Silver nitrate?
Silver nitrate is a chemical compound with formula AgNO3. It is a strong oxidizing agent and is commonly used in chemistry experiments, photography, and in medical applications such as wound care. Silver nitrate is also used in some antiseptic products and in certain types of contact lenses.
Therefore, if the trial mentioned above contains 1 gram of copper, then 1 gram of silver would be produced.
What is Copper?
Copper is a reddish-brown metal that is malleable and ductile, and is one of the most conductive elements on the periodic table. It is often used in electrical wiring, piping, and other industrial applications because of its high electrical and thermal conductivity.
To know more about Silver nitrate,
https://brainly.com/question/29426334
#SPJ4
What are two commonly used types of electron microscopes?
explain
poin
A gaseous mixture contains He that exerts a pressure of 2 atm, Ne that exerts a pressure of 1.25 atm, and Ar that exerts
a pressure of 1.5 atm. At constant temperature What is the total pressure of the gas mixture?
1.50 atm
3.00 atm
Not enough information
4.75 atm
The total pressure exerted by a mixture of gases is equal to the sum of the partial pressures of the component gases at constant volume and temperature.
How can you determine a gas mixture's overall pressure?In the case of an ideal gas mixture, the combined pressure of the gases is equal to the sum of the individual pressures of each gas. This finding, also referred to as Dalton's law of partial pressures, is expressed as follows: P (total) Equals P 1 plus P 2 plus P 3 plus...
What is a gas's constant pressure?When the volume of a gas remains constant, the relationship between pressure and temperature is direct. When volume is constant, the pressure to temperature ratio remains constant.
To know more about total pressure visit:-
https://brainly.com/question/29588220
#SPJ1
determine the indentity of the daughter nuclide from the positron emission of o-15? question 2 options: a) n-14 b) f-16 c) c-15 d) n-15 e) c-11
The above sentence refers to n-15, the daughter nuclide of o-15's positron emission.
What kind of emissions are there?Examples of emissions include radio broadcasts, burps, and car exhaust. A discharge into the open is technically considered an emission. However, it most frequently refers to gases that are emitted into the atmosphere, such as greenhouse gases or emissions from companies and power plants.
Pollution and emissions – are they synonymous?Polluting emissions do not make up all emissions. As an illustration, during photosynthesis, plants release oxygen into the atmosphere. Pollutants are gases or particle that have been released into the air and have a detrimental effect on people or the environment.
To know more about emission visit:
https://brainly.com/question/20388835
#SPJ4
write a net ionic equation to show why solid potassium hydroxide, koh (s), forms a basic solution when it dissolves in water.
a net ionic equation to show why solid potassium hydroxide, koH (s), forms a basic solution when it dissolves in water
Equation
KOH (s) [H2O ] → K+(aq)+OH−(aq)
The Arrhenius theory, the Brnsted-Lowry theory, and the Lewis theory are the three ideas that have contributed to the definitions of acids and bases over time. According to Arrhenius, an acid is a chemical that, when ionised, releases protons (hydrogen ions) into the solution, whereas a base releases hydroxide ions.
According to Brnsted-Lowry, a base is a proton acceptor and an acid is a proton giver. According to Lewis, a base is an electron-pair donor, while an acid is an electron-pair acceptor
KOH satisfies the Arrhenius theory's definition of a base by producing hydroxide ions when ionised. The hydroxide ion is the base component from a Brnsted-Lowry perspective since it can accept a proton to create water. Although it is a little more difficult to understand from a Lewis perspective why this is a base, the oxygen in the hydroxide has three pairs of non-bonding electrons on it. When a proton (acid) is present, it lacks the electrons necessary to create a covalent link, therefore hydroxide donates an electron pair to the proton in order to build a coordinate covalent bond, which produces water. The three theoretical requirements for a base are thus satisfied by the aforementioned net ionic equation.
To know more about acid,
https://brainly.com/question/25148363
#SPJ4
How many grams of Ag2S2O3 form
when 125.0 g AgBr reacts completely
according to the reaction below?
2AgBr + Na2S2O3 → Ag2S2O3 + 2NaBr
Ag2S2O3: 327.74 g/mol
AgBr: 187.70 g/mol
[ ? ] g Ag₂S2O3
The mass (in grams) of Ag₂S₂O₃ formed when 125 g of AgBr react completely is 109.13 g
How do I determine the mass of Ag₂S₂O₃ formed?We can obtain the mass of Ag₂S₂O₃ formed by doing the following:
2AgBr + Na₂S₂O₃ -> Ag₂S₂O₃ + 2NaBr
Molar mass of AgBr = 187.70 g/molMass of AgBr from the balanced equation = 2 × 187.70 = 375.4 gMolar mass of Ag₂S₂O₃ = 327.74 g/molMass of Ag₂S₂O₃ from the balanced equation = 327.74 gFrom the balanced equation above,
375.4 g of AgBr reacted to produce 327.74 g of Ag₂S₂O₃
Therefore,
125 g of AgBr will react to produce = (125 × 327.74) / 375.4 = 109.13 g of Ag₂S₂O₃
Thus, the mass of Ag₂S₂O₃ formed is 109.13 g
Learn more about mass:
https://brainly.com/question/9526265
#SPJ1
How gas behave at STP ( Standard Temperature & Pressure )
Answer:
The National Institute of Standards and Technology defines STP differently as absolute pressure of 1 atm (101.325 kPa, 14.696 psi) and 20 degrees Celsius (293.15 degrees Kelvin, 68 degrees Fahrenheit).
calculate the standard entropy of vaporization of ethanol at its boiling point, 352 k. the standard molar enthalpy of vaporization of ethanol at its boiling point is 40.5 kj/mol.
The standard entropy of vaporization of ethanol at its boiling point 352K is 115.056 J/K-mol.
Given,
Enthalpy of vaporization of ethanol = 40.5 kJ/mol = 40.5 × 10³ J/mol
Entropy of vaporization of ethanol boiling point = 352 K
Determine the standard entropy of vaporization of ethanol,
We get here standard entropy of vaporization of ethanol that is expessed as,
Standard entropy of vaporization of ethanol ΔS = ΔH/T .............1
Here ΔH is enthalpy of vaporization of ethanol and T is the temperature.
Substitute the values in equation 1
Standard entropy of vaporization of ethanol ΔS = ΔH/T
= [40.5 × 10³] / 352
= 40500/352
= 115.056 J/K-mol.
Hence, the standard entropy of vaporization of ethanol at its boiling point 352K is 115.056 J/K-mol.
Learn more about standard entropy of vaporization from the link given below.
https://brainly.com/question/29570332
#SPJ4