Answer:
Initial concentration of acetic acid (CH3COOH_initial): 0.25 M
pKa for acetic acid: 4.76
Assume x is the concentration of H+ ions formed through dissociation.
CH3COOH ⇌ x (due to dissociation)
Apply the x-is-small approximation: We assume x is much smaller than the initial concentration of acetic acid (0.25 M). Therefore, we can neglect x in comparison to 0.25 M.
Calculate pH using the pKa equation:
Rounded to two decimal places, the pH of the acetic acid solution is approximately 2.68.
Explanation:
The statement “Aconcentrated solution contains a large proportion of solute relative to thesolvent.” is true. It means that the amount of solute molecules present in thatsolution is greater than the amount of solvent molecules present in thatsolution.
(2) the iron loses its metallic properties
(3) the sulfur gains magnetic properties
(4) the sulfur gains metallic properties
The mixture of iron sulfide formed is non-magnetic wherein iron looses its magnetic properties.
The properties of compound are different from those of the elements from which it is formed. The reason to this is when elements combine to form compounds ,the properties of elements are completely changed and have completely new set of properties.
When iron which has magnetic properties forms a mixture with sulfur iron sulfide is formed,which is non-magnetic.Here, the iron looses it's magnetic properties as it forms compounds with sulfur.
On combining with sulfur, compound formed is iron sulfide with no magnetic properties .Thus on moving the magnet over this mixture does not attract any iron particle towards it as the properties are completely altered when compounds are formed.
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A 6 6
D 6 7
G 7 7
E 7 8
How many different elements are represented by the nuclei in the table?
A 1
B 2
C 3
D 4
Atom Number of protons Number of neutrons. 2 elements are represented by the nuclei in the table
Atomic number of an element is defined as total number of protons present in the nucleus, neutrons carry no net electrical charge, so it is the charge number of the nucleus.
atomic mass of an element can be defined as the atomic weight is measured total mass of an element’s atom, the total number of neutrons and protons in the nucleus of an atom.
Both Atomic mass and an atomic number of elements are closely related if atomic number is high, then the atomic mass is also said to be high.
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Answer:
B.
Explanation:
BECAUSE IT IS B.
(2) Chemical energy is used to produce a thermal change.
(3) Electrical energy is used to produce a chemical change.
(4) Thermal energy is used to produce a chemical change
The electrolysis describe " electrical energy is used to produce a chemical change."
The process of dissolving ionic compounds into various constituent components by running a continuous electric current through into the complex in a fluid form is known as electrolysis.
The energy produced by the flow of electrons from one location to another is referred to as electrical energy. Current or electricity is the transportation of charged particles across a medium.
The electrolysis describe " electrical energy is used to produce a chemical change."
To know more about electrolysis and electrical energy.
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