Answer:
The reasons can be :
There are impurities in substances
She would observe a yellowish solid precipitate which is the lead iodide and a white solid precipitate which is the potassium nitrate.
This is because the lead nitrate solution which contains particles of lead will mix with the potassium iodide solution containing particles of iodide. Upon mixing,the lead particles from the Lead nitrate solution combines with the iodide particles from Potassium iodide and form two compounds, a yellowish solid precipitate called lead iodide and a white solid precipitate called Potassium nitrate.
The formation of entirely two new compounds is known as the double displacement reaction and can be written in a chemical equation as
2KI(aq.)+Pb(NO₃)₂(aq.)------>2KNO₃(aq.)+PbI ₂(s)
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Answer:
C
Explanation:
The section C is indicating the products of the reaction
The unified cell theory states that: all living things are composed of one or more cells; the cell is the basic unit of life; and new cells arise from existing cells.
Answer:
Temperature of boiling point for solution is 101.60°C
Explanation:
This colligative property is boiling point elevation.
ΔT = Kb . m . i
ΔT = T° boiling point for solution - T° boiling point for pure solvent
Kb = The molal boiling point constant
m = molality
i = Van't Hoff factor ( for NaCl i = 2)
NaCl → Na⁺ + Cl⁻
Let's calculate molality (mol of solute in 1kg of solvent)
Mol of salt = Salt mass / Salt Molar mass
Mol of salt = 45 g / 58.45 g/m → 0.769 moles
0.769 moles/0.5 kg = 1.54 m
T° boiling point for solution - 100°C = 0.52°C/m . 1.54m . 2
T° boiling point for solution = (0.52°C/m . 1.54m . 2) + 100°C
T° boiling point for solution = 101.60°C