Answer:
The list is limited to 20 most important contributors or, if less, a number sufficient to account for 90% of the provenance. The listed Reaction acts as a link to the relevant references for the measurement. The Measured Quantity is normaly given in the original units; in cases where we have reinterpreted the original measurement, the listed value may differ from that given by the authors. The quoted uncertainty is the a priori uncertainty used as input when constructing the initial Thermochemical Network, and corresponds either to the value proposed by the original authors or to our estimate; if an additional multiplier is given in parentheses immediately after the prior uncertainty, it corresponds to the factor by which the prior uncertainty needed to be multiplied during the ATcT analysis in order to make that particular measurement consistent with the prevailing knowledge contained in the Thermochemical Network.
Explanation:
Arrange the following ions in order of increasing ionic radius: nitride ion, magnesium ion, fluoride ion, aluminum ion.
Explanation:
Nitride ion > Fluoride ion > Magnesium ion > Aluminum ion
How many O atoms are there in 1.51×10^23 molecules of trifluoroacetic acid, C2HF3O2?
Answer:
9.033 × 10²³ molec C₂HF₃O₂ x (2 O atoms / 1 molec C₂HF₃O₂) = 1.8066 x 10²⁴ O atoms
There are 3.01 × 10^23 atoms of oxygen in 1.51×10^23 molecules of trifluoroacetic acid, C2HF3O2.
The formula of trifluoroacetic acid is C2HF3O2
Number of moles of the trifluoroacetic acid(C2HF3O2)is given using the approach;
1 mole of the compound contains 6.02 × 10^23 molecules
x moles of the compound contains 1.51 × 10^23 molecules
x = 1.51 × 10^23 molecules × 1 mole /6.02 × 10^23 molecules
x = 0.25 moles of trifluoroacetic acid.
Now;
Number of O atoms in the sample = 0.25 × 2 × NA
Where; NA = Avogadro's number
Number of O atoms in the sample = 0.25 × 2 × 6.02 × 10^23 atoms
= 3.01 × 10^23 atoms
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what is the mass percent of a solution prepared from 50.0g nacl and 150.0g of water
Answer:
Explanation:
In this problem, we have 50.0 g of solute and 150.0 g of water. The total mass of the solution will thus be 50.0 g + 150.0 g = 200.0 g. The mass percent will be 50.0g/200.0 g (x100%) = 25.0 %.
Mass percent of a solution can be defined as grams of solute per 100 grams of solution. In this problem, we have 50.0 g of solute and 150.0 g of water. The total mass of the solution will thus be 50.0 g + 150.0 g = 200.0 g. The mass percent will be 50.0g/200.0 g (x100%) = 25.0 %. You can also look at it another way. Since you have 50 g solute in 200 g solution, you will have 25 g solute in 100 g solution. By the definition provided above, this is a 25% by mass solution.
The table below gives the numbers of protons, electrons, and neutrons in four atoms.
Atom
Number of protons
Number of neutrons
Number of electrons
1
9
8
9
2
19
9
18
3
9
9
10
9
10
19
Based on the table, which atom has a charge of -1?
1
2
Оооо
3
4
Answer:
C. Atom 3
Explanation:
I'm sorry if I answered this late, but hope this helps! :D
Answer:
c
Explanation:
edge 2021
A sample of boron consist of 10B (mass 10.0 amu) and 11B(mass 11.0). If the average atomic mass of B is 10.8 amu, what is the % abundance of each boron isotope
Answer:
%abundance of isotope B-11 is 80%, therefore, the %abundance of isotope B-10 is 20%.
Explanation:
The average atomic mass of an element is actually a weighted average atomic mass, taking into account the percent abundance of the naturally occurring isotopes of the element.
To calculate the weighted average mass, you must take the sum of atomic masses of all the naturally occurring isotopes multiplied by their %abundance.
Ave At. Mass = sum of [(isotopic mass)(%abundance)]/100
If we let the %abundance of B-11 be represented by X, then the %abundance of B-10 must be (100-X).
Now we can set up the following equation and solve for X
10.8 = [(10)(100-X) + (11)(X)]/100
1080 = 1000 - 10X + 11X
80 = X
So, the %abundance of isotope B-11 is 80%, therefore, the %abundance of isotope B-10 is 20%.
Write a balanced equation for each of the following decomposition reactions:
Solid stannous chlorate decomposes with heat to give stannous chloride and oxygen gas.
Sn(ClO3)2 -> SnCl2 + 3O2
Explanation: There should be equal amounts of each element on both sides. This assumes it’s referring to Sn 2+, and not Sn 4+.
The balanced chemical equation will be:
[tex]\rm \bold{(SnClO_3)_2\;\overset{\Delta}{\rightarrow}\;SnCl_2\;+\;3\;O_2}[/tex]
Stannous chlorate has been also known as Tin chlorate. The compound has been a white crystalline powder and has been used for the sensitization of the metal.
The decomposition of Stannous chlorate under the influence of heat has resulted in the formation of stannous chloride and oxygen gas.
The reaction can be given as:
[tex]\rm (SnClO_3)_2\;\overset{\Delta}{\rightarrow}\;SnCl_2\;+\;O_2[/tex]
The number of atoms on the reactant and the product side is not equal. By putting the coefficient to the compound, the reaction can be balanced. The balanced chemical equation will be:
[tex]\rm \bold{(SnClO_3)_2\;\overset{\Delta}{\rightarrow}\;SnCl_2\;+\;3\;O_2}[/tex]
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Will Co(OH)2 precipitate from solution if the pH of a 0.020 M solution of Co(NO3)2 is adjusted to 8.5? ( Ksp of Co(OH)2 is 1.3×10−15 .)
TRUE CO(OH)₂ will precipitate from the solution if the pH of a 0.020 M solution of CO(NO₃)₂ is adjusted. ; ( TRUE )
Given that:
Ksp of CO(OH)₂ = 1.3 * 10⁻¹⁵
Chemical reaction
CO⁺² + 2OH ----> CO(OH)₂
First step : determine the pOH value
pOH of solution = 14 - pH
= 14 - 8.5 = 5.5
Also
pOH = - log [ OH⁻ ] = 5.5
Therefore : [OH⁻] = - Antilog ( 5.5 )
= 3.16 * 10⁻⁶
[CO⁺²] = 0.02 given that it is obtained from 0.02 M solution of cobalt nitrate
Next step : determine the Ionic product of cobalt hydroxide
Ionic Product ( IP ) = [CO⁺²] [OH⁻]²
= 0.02 * ( 3.16 * 10⁻⁶)²
= 1.99 * 10⁻¹¹
Given that the Ionic product is greater than the Ksp of CO(OH)₂ therefore CO(OH)₂ will precipitate
Hence we can conclude that TRUE CO(OH)₂ will precipitate from the solution if the pH of a 0.020 M solution of CO(NO₃)₂ is adjusted. ; ( TRUE )
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the enzyme urea catalyses this reaction. If urea is added to a solution that contains ammonia and other nitrogen- containing compounds (but no urea), will the urea catalyse any reactions? Explain your answer?
Answer:
The enzyme urease catalyzes the hydrolysis of urea into ammonia and carbon dioxide. If urease is added to any compound which has no urea, it will not catalyze any reaction because if there is no urea, urease will not bind to any substance.
What is the pH of the solution obtained by mixing 68.00 mL of 0.280 M HCl and 60.00 mL of 0.125 M NaOH
The pH of the solution is approximately : 1.05
Given data :
volume of HCl = 68.00 mL = 0.068 L
concentration of HCl = 0.280 M
Volume of NaOH = 60 mL = 0.6 L
concentration of NaOH = 0.125 M
Determine the pH of the solutionFirst step : determine the number of mol of HCl and NaOH
mol of HCl = 0.068 * 0.280 = 0.0190 mol HCl
mol of NaOH = 0.06 * 0.125 = 0.0075 mol NaOH volume of
excess moles of H⁺ after reaction = 0.0190 - 0.0075 = 0.0115 mol
Next step : determine the pH value of the solution
Total volume of solution = 0.068 + 0.060 = 0.128
concentration of the solution [ H⁺ ] = excess moles / total volume
= 0.0115 / 0.128 = 0.0898
Therefore
pH = - log [ H⁺ ]
= - log ( 0.0898 ) = 1.047 ≈ 1.05
Hence we can conclude that The pH of the solution is approximately : 1.05 .
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Elements Q and T are widely separated on the electronegativity scale. This indicates that in the compound QT Select one: Q And T are widely separated in atomic number Or the bond is principally ionic in character. Or the heat of formation has a low value. Or the bond is principally covalent in character.
This indicates that in the compound QT the bond is principally ionic in character. It is a fundamental type of chemical bond.
What is an ionic bond?An ionic bond is a type of chemical bond between two atoms due to the attraction between two opposite ions.
These opposite ions in an ionic bonding are referred to as negative ions and positive ions.
An ionic bonding only occurs when the electrons (e-) of a given atom can be transferred to other atoms in the compound.
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Which statement best describes a physical change?
O Changes can occur to certain chemical properties of the substance, but the overall shape of the substance will
remain the same.
Changes can occur to certain physical properties of the substance, but the overall shape of the substance will
remain the same.
O Changes can occur to physical properties of a substance, but the chemical composition of the substance remains
the same.
O Changes can occur to chemical properties of a substance, but the chemical composition of the substance remains
the same.
Answer:
Changes can occur to physical properties of a substance, but the chemical composition of the substance remains
What is kinetic energy?
A: energy that depends on an object’s motion
B: energy that exists in the form of heat
C: stored energy that depends on an object’s chemical composition
D: stored energy that depends on an object’s position
Answer:
the answer should be A. energy that depends on an object's motion
Answer: A
Explanation: Kinetic energy is energy of build up of motion .
if Tim and maliyah went to the moon and the moon is smaller than earth both maliyah and Tim's mass would stay the same and their weight would change
Answer:
no
Explanation:
Weight is a measure of how much gravity pulls on a mass or object. On the moon, there is less gravity pulling on objects, so they weigh less. ... But does its mass changejust because it is on the moon? No, it is still the same size and looks the same, it just has less gravity pulling on it, so it weighs less.
what is the maximum gauge pressure of waters that can measured using piezometer tube 2m high?
Answer:
P = ρgh = 1000 × 9.81×2 =19.62 kN/m^2
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How do you determine the chemical reactivity for nonmetals by using the periodic table?
elements increase in reactivity as they go down in groups and up in periods!!
If 3.49 g of silver chloride, AgCl, is produced from the reaction of 5.95 g AgNO3 with excess BaCl2,
what is the percentage yield ?
(molar masses: AgCl = 143.4 g/mol, AgNO3 = 169.9 g/mol)
2 AgNO3(aq) + BaCl2(aq) + 2 AgCl(s) + Ba(NO3)2(aq)
Answer:
that not of i grade sorry
Explanation:
write the property of graphite? any two
Answer:
Allotrope of carbon.
High melting point.
Explanation:
Answer:
Density lower than that of diamond.
It has soft, slippery feel.
Two cities in Germany are located 25 km apart. What is the
distance in miles?
Answer:
15.5343
Explanation:
The formula for the nitrate ion: NO3 NO2 NO3+
Answer:
NO3-
Explanation:
edge2020
no3-Edg 2020
Explanation
Brainliest
I’ll give the brainliest answer to whoever helps me with these!! I need them ASAP!
1. How many moles are in 3.63x10^11 atoms of Mt?
2. How many moles are in 5.96g of KNO3?
3. How many moles are in 1.50 grams of CH4?
4. How many liters are in 82.0g KBr?
Answer:
Your question will be shared anonymously with online publishers who may be interested in answering it
Explanation:
make me as brain
Which element has four times as many protons in its nucleus than are found in Neon?
A.Si
B.Ca
C.Zr
D. Hg
Answer: Zr or Zirconium
Explanation: Neon has 10 Protons and four times ten is 40. And Zirconium has 40 protons the symbol for Zirconium is Zr
Neon has 10 protons, the element which has four times more protons than Neon in its nucleus is Zirconium(Zr).
What is a proton?Every atom has a proton, a subatomic particle, in its nucleus. The particle possesses an electrical charge that is positive and opposite to the electrons. A single proton has a mass of only [tex]1.673[/tex]×[tex]10^{-27}[/tex] kilogram when isolated. Just slightly less than a neutron's mass.The atomic number is the number of protons in an element's nucleus. Each element is given a unique identification by this number. The number of protons in the nucleus is constant in all atoms of a given element. The nucleus of an atom of pure hydrogen is made up entirely of one proton. All other elements' nuclei almost usually have neutrons in addition to protons.Protons need not just be found in atoms' nuclei. Protons acquire fascinating, peculiar, and potentially hazardous characteristics when they are discovered outside of atomic nuclei, which are analogous to neutrons in comparable situations. Protons have another characteristic, they can be accelerated by electric and/or magnetic fields because they carry an electric charge. During solar flares, a lot of high-speed protons and atomic nuclei holding them are released. The acceleration of the particles by the earth's magnetic field results in geomagnetic storms, which are ionospheric disturbances.To learn more about Proton, refer to https://brainly.com/question/1805828
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What would happen to the density of a mass of air that is heated?
Would that mass of air rise above and float on top of cooler air above it or would it sink down below cooler air below it? (Assume that the majority of the masses do not mix.)
Answer: As air is heated its density decreases because its mass remains constant but its volume increases. As air is cooled, its density increases because its mass remains constant but its volume decreases. ... The decrease in density as air is heated causes it to rise above cooler, more dense air. Hope this helped.
What do scientists do to determine if their results support their hypothesis?
Answer:
They experiment, and study
Explanation:
Repeat your experiments several times to make sure that the first results weren't just an accident.
Help please I need help fast.
Answer:
d) It incorrectly describes the two processes
Hope it helps you
And please mark it as the brainliest answer
Mg + AgNO3 MgNO3 + Ag
How many grams of magnesium are needed to produce 5.0 moles of silver
Answer:
539.35 g
Explanation:
molar mass of Mg = moles of Ag * molar mass of Ag
x = 5 * 107.87
x = 539.35 g
1s22s22p63523p645230104p5
Which element is this?
answer : bromine
Answer:
indeed it 1s22s22p63523p645230104p5 is bromine
What is a type of nuclear reaction in which the nucleus of a heavy atom splits into two or more smaller nuclei that have masses of relatively similar size?
A: gamma radiation
B: nuclear fusion
C: chain reaction
D: nuclear fission
3. Nitrogen contains two naturally occurring isotopes, N-14 with a mass of 14.003 amu and N-15 with a mass of 15.000 amu. What are the percentages of the two isotopes in naturally occurring nitrogen?
Answer:
Explanation:
fe-45 and O-15 im sure :)
define conductor and insulator ?
Answer:
A conductor is an object or material that conducts heat, electricity, or sound. Examples of metals such as aluminum, steel, iron, and others. Meanwhile, insulators are objects that are difficult to conduct heat, such as ebonite, plastic, cloth, and others
Conductor is something which conducts electricity
examples are copper and other metals
Insulators are quite the opposite, they do not let electricity pass by them, examples are plastics, rubber and wood
Which representative element has the largest atomic radius ?
Answer:
francium
Explanation:
the atomic radius increases from top to bottom in a group, and decreases from left to right across a period.