Answer:
[OH⁻] = 3.34x10⁻³M; Percent ionization = 0.54%; pH = 11.52
Explanation:
Kb of the reaction:
NH3 + H2O(l) ⇄ NH4+ + OH-
Is:
Kb = 1.8x10⁻⁵ = [NH₄⁺] [OH⁻] / [NH₃]
As all NH₄⁺ and OH⁻ comes from the same source we can write:
[NH₄⁺] = [OH⁻] = X
And as [NH₃] = 0.619M
1.8x10⁻⁵ = [X] [X] / [0.619M]
1.11x10⁻⁵ = X²
3.34x10⁻³ = X = [NH₄⁺] = [OH⁻]
[OH⁻] = 3.34x10⁻³M% ionization:
[NH₄⁺] / [NH₃] * 100 = 3.34x10⁻³M / 0.619M * 100 = 0.54%
pH:
As pOH = -log [OH-]
pOH = 2.48
pH = 14 - pOH
pH = 11.52Which of the following correctly shows the relationship, in terms of number of particles, of the three substances?
A. 1 mole of water < 1 mole of helium < 1 mole of aluminum
B. 1 mole of aluminum = 1 mole of helium = 1 mole of water
C. 1 mole of aluminum < 1 mole of helium < 1 mole of water
D. 1 mole of helium < 1 mole of aluminum < 1 mole of water
The correct option which shows the relation between particles of the three substances is 1 mole of aluminum = 1 mole of helium = 1 mole of water.
What is a particle?
A particle is a small part of matter.
The term refers to particles of all sizes, ranging from subatomic particles like electrons to visible particles like dust particles floating in sunlight.
The relationship of a number of particles of the substance can be calculated by Avogadro's law
Thus, the correct option is B. 1 mole of aluminum = 1 mole of helium = 1 mole of water
Learn more about particles
https://brainly.com/question/1685421
How does the number of molecules in 1 mol of oxygen compare with the number of molecules in 1 mol of nitrogen?
1 mol of oxygen has fewer molecules.
1 mol of oxygen has more molecules.
Each sample has the same number of molecules.
The molecules cannot be compared without knowing the mass.
Answer:
Each sample has the same number of molecules.
Explanation:
Just took the quiz on edge 2021
Taking into account the definition of Avogadro's number, each sample has the same number of molecules.
Avogadro's NumberAvogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole.
Avogadro's number applies to any substance.
This caseAvogadro's number applies to any substance. This means that the number of molecules in 1 mol of oxygen is equal to the number of molecules in 1 mol of nitrogen.
Finally, the correct answer is the third option: each sample has the same number of molecules.
Learn more about Avogadro's Number:
brainly.com/question/1445383
brainly.com/question/1528951
The temperature of the system is highest when it is a
A. gas
B. liquid
C. plasma
D. solid
Answer:
gas
Explanation:
its either gas or plasma but gas should be it bc liquid and solid are cold
what is one example of a electromagnetic wave
Answer:
Examples of EM waves are radio waves, microwaves, infrared waves, X-rays, gamma rays, etc.
Answer:
Electromagnetic waves can be split into a range of frequencies. This is known as the electromagnetic spectrum. Examples of EM waves are radio waves, microwaves, infrared waves, X-rays, gamma rays, etc.
Explanation:
To be effective, a certain drug must not drop below 15 mg in the body. A 120
mgs of that drug was administered to a patient. How much time will it take for that drug to reach the 15 mg minimum level. The drug's half-life is 30 minutes.(show how you arrived at your response)
Answer:
90 Minutes
Explanation:
Original concentration = 120 mg
Half life = 30 minutes
Minimum level = 15 mg
Basically, we are to calculate the time it would take to drop from 120 mg to 15 mg.
The half life of a substance is the time it takes for the original concentration of a substance to drop to half it's starting concentration.
First Half life:
Starting concentration = 120mg
Concentration after half life = 120 / 2 = 60 mg
Second Half life;
Starting concentration = 60 mg
Concentration after half life = 60 / 2 = 30 mg
Third Half life;
Starting concentration = 30 mg
Concentration after half life = 30 / 2 = 15 mg
We have reached the minimum 15 mg level. This means it took three half lives to get there.
Total time taken = No of Half lives * Half life duration = 3 * 30 mins = 90 Minutes
An angry science student drops his textbook out of a second story window. Why does it fall to the ground? You may
choose more than one response.
A.The net force acting on the book by gravity is down.
B The drag force of the air pulls it down.
The student let the book go, removing the force of his hand.
D There is a strong magnetic force between the book and the ground.
Answer:
I think qs. "A" the net force acting on the book by gravity is down..
The statement is "The net force acting on the book by gravity is down."
What is gravity?Gravity is defined as the force that pulls materials toward the center point of a planet or other entity.
The textbook falls to the ground because of gravitational attraction between the ground and the book.
Because of the Earth's gravitational influence, the textbook moves towards the Earth when nothing is keeping it up. We know that the book has an equivalent impact on the Earth.
With a free fall acceleration of g, the textbook accelerates toward the Earth.
Hence, the correct option is A
To know more about gravity here
https://brainly.com/question/21454806
#SPJ2
Consider the following reaction:
10 KCIO3 + 3 P4 → 3 P4010 + 10 KCI
Given 30 moles of P4 and 86 moles of KCIO3, which would act as the limiting reactant?
Answer: [tex]KClO_3[/tex] is the limiting reactant in the given reaction.
Explanation:
Limiting reagent is defined as the chemical specie which gets totally consumed in the reaction and the formation of product is dependent on this reagent.
We are given:
Moles of [tex]P_4[/tex] = 30 moles
Moles of [tex]KClO_3[/tex] = 86 moles
The given chemical equation follows:
[tex]10KCIO_3+3P_4\rightarrow 3P_4O_{10}+10KCI[/tex]
By Stoichiometry of the reaction:
If 10 moles of [tex]KClO_3[/tex] reacts with 3 moles of [tex]P_4[/tex]
Then, 86 moles of [tex]KClO_3[/tex] will react with = [tex]\frac{3}{10}\times 86=25.8moles[/tex] of [tex]P_4[/tex]
As, given amount of [tex]P_4[/tex] is more than the required amount. So, it is considered as an excess reagent.
Therefore, [tex]KClO_3[/tex] is considered as a limiting reactant because it limits the formation of product.
A heterogeneous mixture that has very small dispersed particles and stays mixed for a long time is a____. it for science class
Please Help Quick!!!
Lewis Structure of PO3 3-
1. Find its coordination figure/coordination number of central atom (CF)
Ev = Vallence electron of central atom
Σe = electrons donated from substituents
Terminal O gives 0 electrons, hence Σe = 3 x 0
charge = charge of the compound
2. Find EP (electron pairs) and LP (lone pairs)
LP = CF - EP
3. Draw the skeleton with octet substituents (top right figure)
4. Find formal charge for each atoms (Qf)
5. Write formal charge near atom in skeleton
6. Enjoy
Question 1
Organisms sharing a common ancestor
Evolutionary history
A. Fossil record
B.Anatomy
C.Common ancestry
D.Evolution
Answer:
Fossil record
Explanation:
but first think about it befor you do so it could be wrong im not a computer
How many moles and atoms are there in 60 grams of Calcium?
Answer:
The moles present in 60 g of calcium are 1.5 moles.
Answer:
In 60 grams there are 1,5 mols
Explanation:
A breeder reactor is one type of nuclear reactor. In a breeder reactor, uranium-238 is transformed in a series of nuclear reactions into plutonium-239.
The plutonium-239 can undergo fission as shown in the equation below. The X represents a missing product in the equation.
Compare the amount of energy released by completely fissioned plutonium-239 to the amount of energy released by the complete combustion of the same amount of coal.
Answer:hope this help
Explanation:
The picture below shows the positions of the Earth, Moon, and Sun during an eclipse.
What is true of the eclipse shown in the picture?
A.
It is a lunar eclipse, in which the Earth casts a shadow on the Moon.
B.
It is a solar eclipse, in which the Earth casts a shadow on the Moon.
C.
It is a lunar eclipse, in which the Moon casts a shadow on the Earth.
D.
It is a solar eclipse, in which the Moon casts a shadow on the Earth.
Answer:
it is option c liner eclipse
Answer:
A-It is a lunar eclipse, in which the Earth casts a shadow on the Moon.
A 1.0 kg ball is thrown into the air and initial velocity of 30 mi./s how high into the air did the ball travel
Answer:
45.9m
Explanation:
Given parameters:
Mass of the ball = 1kg
Initial velocity = 30m/s
Unknown:
Height the ball will travel = ?
Solution:
At the maximum height, the final velocity of the ball will be 0;
Using ;
V² = U² - 2gh
V is the final velocity
U is the initial velocity
g is the acceleration due to gravity
h is the height
0² = 30² - (2 x 9.8 x h)
0 = 900 - 19.6h
h = 45.9m
How many moles are in 8.63 x 103 atoms of Li?
1.43 × 10⁻²⁰ mol Li
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Using Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:Step 1: Define
8.63 × 10³ atoms Li
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
Set up: [tex]\displaystyle 8.63 \cdot 10^3 \ atoms \ Li(\frac{1 \ mol \ Li}{6.022 \cdot 10^{23} \ atoms \ Li})[/tex]Multiply/Divide: [tex]\displaystyle 1.43355 \cdot 10^{-20} \ moles \ Li[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
1.43355 × 10⁻²⁰ mol Li ≈ 1.43 × 10⁻²⁰ mol Li
What is the percent composition of Cs in CsPO4?
Answer:
58.3%
Explanation:
The formula of the compound is given as:
CsPO₄
Now, the percentage composition of Cs in the compound is = ?
So;
To find this parameter, find the molar mass of the compound:
Molar mass of CsPO₄ = 132.9 + 31 + 4(16) = 227.9g/mol
Percentage composition of Cs= [tex]\frac{132.9}{227.9} x 100[/tex] = 58.3%
The question at the beginning of todays reading is , In what ways do people use detectors why is it important to understand particles in order to invent detectors
Answer:
Explanation:
People use detector to know the ionization of electromagnetic radiation i.e alpha, beta and gamma radiation and the output produced.
In the past, the early detectors use photographic plates which is use to detect tracks due to nuclear reactions.
It is important to know particles before inventing detectors because detectors produces visible trajectories or tracks as a result of particles that are charged which can traverse the apparatus. It was used to detect the positron and also muons and these w are particles that are produced by cosmic rays which is as a result of their interaction in the Earth's atmosphere.
1. How is the atom count for each element on the reactant side of a balanced chemical equation related to the atom count for each element on the product side of the same equation?
Answer: The atom count for each element on the reactant side of a balanced chemical equation is equal to the atom count for each element on the product side of the same equation
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products formed must be equal to the mass of reactants taken.
In order to get the same mass on both sides, the atoms of each element must be balanced on both sides of the chemical equation.
[tex]2H_2+O_2\rightarrow 2H_2O[/tex]
Thus there are 4 atoms of hydrogen on reactant as well as product side.
Also there are 2 atoms of oxygen on reactant as well as product side.
Are the activities exothermic or endothermic?
Answer:
The first 5 are exothermic reaction because heat is in product means heat is evolved or given out.
And last no reaction shows that heat is required so last reaction is endothermic reaction.
Explanation:
And heat is evolved in exothermic reaction and heat is absorbed in endo thermic reaction
Enter a complete ionic equation to show the reaction of aqueous Hg2(NO3)2 with aqueous sodium chloride to form solid Hg2Cl2 and aqueous sodium nitrate. Express your answer as a complete ionic equation. Identify all of the phases in your answer.
Answer: [tex]Hg_2^{2+}(aq)+2NO_3^-(aq)+2Na^+(aq)+2Cl^-(aq)\rightarrow Hg_2Cl_2(s)+2Na^+(aq)+2NO_3^-(aq)[/tex]
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
A double displacement reaction in which one of the product is formed as a solid is called as precipitation reaction.
The balanced chemical equation is:
[tex]Hg_2(NO_3)_2(aq)+2NaCl(aq)\rightarrow Hg_2Cl_2(s)+2NaNO_3(aq)[/tex]
The complete ionic equation will be :
[tex]Hg_2^{2+}(aq)+2NO_3^-(aq)+2Na^+(aq)+2Cl^-(aq)\rightarrow Hg_2Cl_2(s)+2Na^+(aq)+2NO_3^-(aq)[/tex]
Radiation can travel through A. liquids B. gases C. empty space D. all of these
Answer:
Liquids
Explanation:because animals like dolphins use sound radiation under water to hear each other
Answer:
D. all of these.
Explanation:
it can travel through solids, liquids, and gasses.
i need help asap!! i will give brainliest
What is the name of this compound S2I4?
Answer:
Di Sulphur tetraiodide is the chemical compound with the formula S2I4
Explanation:
Does anyone know what I should put for number 2 if you KNOWW plssss
Identify the formula for ammonium nitrate
(NH4)3NO3
NH4(NO2)2
NH4NO2
Answer:
NH₄NO₃
Explanation:
In salt naming, the cation is named first, then you must put the name of the anion. In the same way when you are writting the formula. Also, the global charge of a salt is always 0.
Thus, we must write each ion and its charge:
Ammonium: NH₄⁺
Nitrate: NO₃⁻
As both ions have the same charge, the formula is:
NH₄NO₃The cation first and then the anion.
Meiosis goes through 2 divisions to create four unique haploid cells. true or false
Answer:
True
Explanation:
True is the ANSWER.
9) Given the reaction: N2(g) + O2(g) + 182.6 kJ → 2 NO(g) What is the heat of formation of nitrogen (II) oxide in kJ/mole? A) AH = -182.6 B) AH = -91.3 C) AH = 91.3 Show D) AH = 182.6
PLEASE HELP please
The heat of formation of nitrogen (II) oxide : +91.3 kJ/mol
Further explanationGiven
Reaction
N2(g) + O2(g) + 182.6 kJ → 2 NO(g)
Required
The heat of formation
Solution
In the above reaction, the heat of the reaction is located on the reactant side which indicates that the formation of nitric oxide requires heat (endothermic reaction).
In the above reaction the heat required to form 2 moles of NO, so the heat required for each mole is:
+182.6 kJ : 2 = =+91.3 kJ/mol
why is it called the periodic table of elements (why is the word periodic in it)
Answer:
It is called "periodic" because elements are lined up in cycles or periods. From left to right elements are lined up in rows based on their atomic number (the number of protons in their nucleus). ... Each horizontal row in the table is a period. There are seven (or eight) total periods.
Explanation:
CHEMISTRY QUESTIONS // 30 POINTS
WILL GIVE BRAINLIEST
1. All nonmetals (except hydrogen) have 8 valence electrons?
True or False
2. The N^-3 ion is classified as a(n) ____ and has ____.
A. anion, 8 valence electrons
B. cation, 8 valence electrons
C. anion, 15 valence electrons
D. anion, 3 valence electrons
3. If two nonmetals react to form a compound and have very different _____ they form ____ bonds. If there is a small difference, then they form ____ bonds.
A. ionization energy; covalent; nonpolar ionic
B. electronegativity; nonpolar covalent; polar covalent.
C. ionization energy, ionic, nonpolar covalent
D. electronegativity, polar covalent, nonpolar covalent.
Answer:
yesyeysesyesyesyesteys
Why do you think the different heating process result in different softness or hardness of the steel? Think about what steel is made of and how the atoms move .
Explanation:
Different heating process affect the microstructure of the steel in different ways. Thus, imparting different properties to the steel. For example, annealing is done is done to impart softness to steel, hardening is done to hardened the steel( eg: carburizing, nitriding, cyaniding) whereas tempering is done to improve the ductility of the steel.
Steel mainly contains iron and carbon. This percentage of carbon and iron decides the property of the steel. It is the % of carbon which is altered in different heating process that to obtained the desire microstructure in steel.