The electrons closer to the nucleus would have more energy than the electrons farther away from the nucleus.
Explanation:
If the density of the object is more than that of water, it will sink. Otherwise it will float. The density of water is 1 g/mL.
Substance 1,
Mass, m = 450 g, Volume, V = 90 mL
Density = mass/volume
So,

It will sink.
Substance 2,
Mass, m = 35 g, Volume, V = 70 mL
Density = mass/volume
So,

It will float.
Substance 3,
Mass, m = 24 g, Volume, V = 12 mL
Density = mass/volume
So,

It will sink.
Converting the temperature, 295 K from Kelvin to Celsius scale:

Water has a boiling point of
and a melting point of 
When we compare water at two different temperatures,
we can say that water is in liquid form at both these temperatures as both of them are quite below the boiling temperature and above the melting temperature.
The temperature difference between water at the given two temperatures = 
Water at
is at a higher temperature and so is warmer than water at a lower temperature of
.