Answer:
A particle is the smallest possible piece of something, of matter, while a molecule is the smallest particle of an element, for example H2 is molecule, smallest particle of the hydrogen in the air, and the molecule is two or more atoms held with chemical bonds, and have chemical properties.
I believe it is C, high organic matter level.
Answer:
Ca2+ represents an ion with 20 protons and 18 electrons.
Explanation:
A calcium atom has 20 protons and 20 electrons. The 2+ charge next to the symbol indicates a loss of two electrons: 20-2=18.
The salt disolves into the solution(water), which creates a new mixture.
Arrhenius Acid:
Arrhenius Acid is any specie which when dissolved in water produces H⁺ (proton) Ions.
Nitrous Acid:
Nitrous Acid also acts as Arrhenius Acid when dissolved in water.
HNO₂ + H₂O → NO₂⁻ + H₃O⁺
Where,
H₃O⁺ ⇆ H⁺ + H₂O
As HNO₂ produces H⁺ Ions in water, so it is an Arrhenius Acid.