<h3><u>Answer and explanation</u>;</h3>
- To balance the charges of ions the number of electrons lost is equal to the number of electrons gained. The overall net charge must be zero.
- The number of ions needed to accomplish this is represented by the subscripts.
- For any given ionic compound, the product of the charge on the ion (or multiatomic ionic group) times the subscript of the ion will give a total charge of zero when all ions are considered.
For examples: NaCl Na = +1 Cl = -1 total is zero
The air escapes into the atmosphere.
An <em>emulsion</em> is a colloidal dispersion of one liquid in another liquid in which it does not dissolve.
<em>Ice cream</em> is essentially an emulsion of the fat in milk with a sugar solution trapped in a network of small ice crystals. Other chemicals are added to prevent the emulsion from separating, and air bubbles are mixed into the semisolid mixture.
<em>Up to 50 %</em> of the volume of ice cream can be air.
When the ice cream melts, the air bubbles are <em>no longer trapped</em>. They just escape into the atmosphere.
If you re-freeze the melted ice cream, its volume will be much less than the original.
Answer:

Explanation:
Suppose an electron makes transition from n initial (ni) to n final (nf) then formula for wavelength is given by,

Where,
- λ is wavelength of photon
- Rʜ is rydberg constant, the value of Rʜ is
109690 Cm-¹ in <em>Puri Sharma Pathania</em> standard book of physical chemistry &
109737 Cm-¹ according to <em>Wikipedia</em>
- Z is the atomic number of atom, for hydrogen Z =1,
& according to given data, ni = 5, nf = 3
Solution:
Let's solve for wavelength,
Substituting all the given data in above formula,






Now we know that, 1 cm = 10000000 nm,
Converting the wavelength from Cm → Nm




Answer:

Explanation:
The given reactions are:
PbCl2(aq)⇌Pb2+(aq)+2Cl−(aq) 
AgCl(aq)⇌Ag+(aq)+Cl−(aq) 
Required reaction is:
PbCl2(aq)+2Ag+(aq)⇌2AgCl(aq)+Pb2+(aq)

On a molecular level there is a lot of movement which in turn is the reason why heat is generated.