Reactivity is not a physical property because it's a characteristic of a chemical element or compound and is involved in chemical process.
The answer is B, you just check if it is the same on the left and right side
A:
Left side - Right side
2xH - 2xH
1xS - 3xS
4xO - 12xO
2xAl - 2xAl
Therefore A is not correct
B:
Left side - right side
2xK - 2xK
1xCl - 1xCl
1xPb - 1xPb
2xN - 2xN
6xO - 6xO
B is therefore correct as both sides add up
1) Balanced chemical reaction:
2HClO₄(aq) + K₂CO₃(aq) → K₂CO₃(aq) + CO₂(g) + H₂O(l).
2) Balanced chemical reaction:
HC₂H₃O₂(aq) + LiHSO₃(aq) → LiC₂H₃O₂(aq) (aq) + SO₂(g) + H₂O(l).
3) Balanced chemical reaction:
(NH₄)₂SO₄(aq) + Ca(OH)₂(aq) → CaSO₄(s) + 2NH₃(g) + 2H₂O(l).
CaSO₄ (calcium sulfate) is insoluble in water.
Answer:
When two oppositely charged objects are brought near each other, a force of attraction is produced between the charges and they become attracted to each other.
If the distance between the two charges were to be increased, the force of attraction between the two charges decreases.
Explanation:
According to Coulombs law, the force of attraction or repulsion between two charges is directly proportional to the magnitude of the charges and inversely proportional to the square of distance of separation between the charges.
Also, a fundamental principle of electrostatics states that like charges repel each other whereas unlike charges attract each other.
From these two laws, it can be deduced that a force of attraction will exist between the two oppositely charged objects when they are brought close ti each other. Also, when the distance of separation between the objects is increased, the magnitude of attractive force between them decreases. This decrease is such that if the distance of separation is increased by a factor of say 2, the magnitude of attractive force decreases by a factor of the square of 2 which is 4.
