Correct Answer: Option g: <span>adding salt to water lowers its freezing point
Reason:
Freezing point is a colligative property. When a non-volatile solution is present in solution, it's freezing point decreases. This is referred as depression in freezing point (</span>ΔTf<span>). Extent of lowering in freezing point is dependent on number of particles present in system. Mathematically it is expressed as:
</span>ΔTf = Kf X m
<span>
where, m = molality of solution
Kf = cryoscopic constant.
Hence, a</span><span>dding salt to water lowers the freezing point of solution.</span>
1. Heat always flow from a region of higher temperature
to a lower temperature, just like concentration gradient. So in this case,
since the metallic sphere is hotter than water, so naturally heat energy flows
from the metallic sphere to the water.
2. We use the formula:
Q = m C ∆T
where Q is the heat energy gained, m is mass of water, C
is heat capacity of water = 4.184 J/g°C and ΔT is change in temperature
Since density of water is 1 g/mL, so mass is also 100g,
therefore:
Q = 100 g * 4.184 J/g°C * (27.1°C - 25°C)
Q = 878.64 J
3. Heat gained by the water is equal to the heat lost by
the metal, therefore:
Q(water) = - Q(metal)
878.64 J = - 15 g * C * (27.1°C - 98°C)
C = 0.83 J/g°C
I think this is true because they’re in the same layer, strata which would mean they died around the same time. Hope this helps sorry if it’s wrong!
You should avoid it because there are hazards to consider when you are doing a laboratory experiment. For example the sleeves might catch in fire , you spilled a corrosive solution in yourself.