Answer:Why is Dalton credited with proposing the first atomic theory if Democritus was talking about atoms almost 2,200 years earlier?
- Democritus' ideas were not supported by evidence
- Dalton's theory was the first scientific theory because it relied on scientific investigative processes.
- Dalton's theory was supported by evidence and repeated investigation.
Explanation: 1: Democritus' ideas were not supported by evidence
2: Dalton's theory was the first scientific theory because it relied on scientific investigative processes.
3: Dalton's theory was supported by evidence and repeated investigation.
Answer:
Activation of the ring towards substitution: NH2, OCOCH3
Withdrawal of electrons through resonance. COOH, SO3H
Explanation:
During electrophilic substitution, certain substituents may activate or deactivate the benzene ring.
Substitients that activate or deactivate the benzene ring may do so via resonance or inductive effect.
Groups such as -NH2 and OCOCH3 activate the ring via resonance while groups such as -SO3H and -COOH deactivate the ring via resonance.
Answer:
Option (B) is correct
Explanation:
Oxidation:
Reduction:
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Overall:
Nernst equation for this cell reaction at :
Where, n is number of electron exchanged and species inside third bracket represents concentrations in molarity.
Here, n = 2, and
So, plug in all the given values into above equation:
So,
As the value "0.059" varies from literature to literature and is most closest to therefore option (B) is correct.
Answer:
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Explanation:
Elements Atomic Mass (u)
Hydrogen 1
Carbon 12
Nitrogen 14
Oxygen 16
Sodium 23
Magnesium 24
Sulfur 32
Chlorine 35.5
Calcium 40
actor Atoms Molecules
Definition Most fundamental and smallest part that can exist of an element. Two or more atoms chemically bonded together.
Example Oxygen – O
Phosphorus – P
Sulphur – S
Hydrogen – H Oxygen – O2
Phosphorus – P4
Sulphur – S8
Water – H2O
Structure The smallest particle with properties of an element. Combination of two or more atoms.
Stability An atom may not always be stable in nature due to the presence of electrons in the outer shells. Molecules are formed to attain stability.
Constituent Elements Protons, Electrons & Neutrons Two or more atoms of the same or different elements
Reactivity Except for the noble elements, atoms of all elements showcase a certain level of reactivity. Compared to a molecule, the level of reactivity is less than some valence points are filled by electrons of combined elements.
The force would be 10.5 n given that mass of the soccer ball, m= 0.42 kg