The answer is by using chemical reactions.
Given that seawater freezes at a lower temperature than pure water because of the salts dissolved in it.
Answer:
A. False
B. True
C. False
Explanation:
- A. After the excess sucrose has crystallized out, the remaining solution is not saturated.
This is false, once the excess sucrose has crystallized out, the remaining solution is saturated. There's as much sucrose as can be in that amount of water at that temperature.
- B. After the excess sucrose has crystallized out, the system is now stable and is in equilibrium.
This is true, it is stable because it will not change by itself, it is in equilibrium because the rate of sucrose molecules leaving the surface of the crystals to be hydrated by water is equal to the rate of sucrose molecules in water attaching to the surface of the crystals.
- C. Is false because the system is in equilibrium, so the two rates are equal.
Answer:
Explanation:
A change in oxidation number represents a transfer of electrons between atoms/ions. This is what happens during oxidation and reductions, where electrons are gained and lost (respectively).
Explanation:
The boiling point of petrol is 483K and that of water in 373K. Since the difference between the boiling point temperatures is high, we can use the method of distillation as explained above to obtain petrol and water from the liquid mixture. Therefore, the correct answer is option (A).