No, materials do not melt at the same temperature. An example would be cooking oils. Some burn at lower temperatures than others.
no
No.
You could possibly arrange an experiment for different substances to melt and boil at the same time, but they would not do so at the same temperature. Different substances have different properties, they do not all melt and boil at the same temperature.
because they are made from different molecules and elements. It's like asking why are some materials harder than others.
As all the ice does not melt then the temperature must be 0'C (assuming uniform temperature of the block and that the rivets remain in thermal contact with the remaining ice.)
Yes
when all the ice has melted
no
You could possibly arrange an experiment for different substances to melt and boil at the same time, but they would not do so at the same temperature. Different substances have different properties, they do not all melt and boil at the same temperature.
yes
All materials have the same temperature in identical conditions.
because they are made from different molecules and elements. It's like asking why are some materials harder than others.
All objects have melting points but they are high sometimes and low sometimes. There is no object without a melting point.
All materials have a certain point in which they will 'melt' and turn into a liquid, so yes :)
it all depends on the temperature. ice melts faster at higher temperatures
It depends on the substance and not in temperature, we have gas (oxygen) we can have liquid (water, H2O) and we can have ice... that will melt
No all solids do not expand at same rate because some solid expand at less temperature and some solids expand at less temperature. For example if we take iron and plastic iron expands at high temperature and plastic melt at less temperature(at candle light also).
The effect of salt (any soluble material will work) is to lower the freezing point of the water, making it melt faster at a given temperature (or melt at all, if the temperature is slightly below the normal freezing point).
It all depends on the temperature of the surfaces, the temperature of the air around the surfaces, and other small unavoidable environmental inequities. In theory, however, if the conditions are exactly the same (surfaces same temperature in a vacuum with heat magically applied the the ice cubes in the exact same way with no heat loss to the surfaces) they will melt at the same rate. In reality the circumstances are too variable to test this perfectly though.