A buffer contains the weak acid HA and its conjugate base A-. the weak acid has a p Ka of 4.82 and the buffer has a pH of 4.25. Which statement is true of the relative concentration of the weak acid and its conjugate base in the buffer? a) [HA} > [A-]
b) [Ha} < [A-]
c) [HA]=[A-]
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Which temperature change would cause the volume of a sample of an ideal gas to double when the pressure of the sample remains the same?
In an ionic compound, the smallest whole-number ratio of positive and negative ions thatresults in a neutral unit is called the
What biome could be characterized by large evergreen trees, acidic soil, lichens, and heavy winter snowfall?
How to convert Gdm-3 to moldm-3
A) markings on the gun's exterior
B) markings on the casing
C) markings on the bullet
D) powder residues
Answers
One that is can associate a suspect and the firing of a gun is powder residues. The correct option is D.
What is gun power residue?
GSR is made up of unburned or partially burned gunpowder particles, soot, nitrates, and nitrites from powder combustion, primer particles (oxides of lead, antimony, and barium), and bullet or bullet jacket particles that are vaporized when a firearm is discharged.
Gunshotresidue (GSR) is a speck of vital trace evidence that assists forensic scientists in solving a wide range of firearm-related incidents.
The identification of the shooter, as well as bullet identification from a gunshot wound, aid in the reconstruction of a crime scene.
Powderresidues are one thing that can link a suspect to a gunshot.
Thus, the correct option is D.
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The answer is nucleic acids
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Answer : The enthalpy of fusion of ice is, 334 J
Solution :
Formula used :
Where,
q = heat absorb = 6.68 KJ = 6680 J
m = mass of ice = 20 g
= enthalpy of fusion of ice = ?
Now put all the given values in this formula, we get the enthalpy of fusion of ice.
Therefore, the enthalpy of fusion of ice is, 334 J
Answers
%yield = 86.93%
Further explanation
Given
Reaction
CaCN₂+3H₂O=>CaCO₃+2NH₃
Required
The percent yield
Solution
mol CaCN₂(MW= 92 g/mol) :
= mass : MW
= 77 g : 92 g/mol
= 0.834
From equation, mol NH₃ :
= 2/1 x mol CaCN₂
= 2/1 x 0.834
= 1.668
Mass NH₃(theoretical):
= 1.668 mol x 18 g/mol
= 30.024 g
% yield = (actual/theoretical) x 100%
%yield = (26.1/30.024) x 100%
%yield = 86.93%
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The transfer of heat energy that does not require matter of any type is radiation
What is Radiation?
Energy that emanates from a source and moves through space at the speed of light is referred to as radiation. This energy has wave-like qualities and is accompanied by an electric field and a magnetic field. Radiation may also be referred to as electromagnetic waves. electromagnetic waves or particles are emitted as energy.
Radon gas, cosmic rays from space, x-rays used in medicine, and radiation emitted by radioactive isotopes are examples of common sources of radiation. Radiation is the process of transferring thermal energy without the need for any kind of materials.
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Silicon (Si) has 4 valence electrons, and sulfur (S) has 6 valence electrons each. Since there are two sulfur atoms in SiS2, that's a total of 2 x 6 = 12 valence electrons from sulfur.
Now, add the valence electrons from silicon and sulfur:
4 (Si) + 12 (S) = 16 valence electrons in total.
In a covalent compound like silicon disulfide, all the valence electrons are involved in bonding, either in forming bonds (shared electrons) or as non-bonding pairs.
Since SiS2 forms two covalent bonds (Si-S-Si), each involving two electrons, there are 4 electrons used for bonding (2 pairs of bonding electrons). Therefore, the remaining 16 - 4 = 12 electrons are non-bonding pairs.
So, there are 12 pairs of non-bonding electrons in a silicon disulfide (SiS2) molecule.