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Normal, btw are you from glenwood highscool, because I am, and I got that assignment :)

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∙ 14y ago

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Is solid at 25 degree C and changes to a liquid when heated to 98 degrees C a physical property of sodium?

At normal pressure, yes.


What is the difference between frozen ice cream and melted ice cream?

Frozen ice-cream is ice-cream that has been cooled to the point where it's state is solid. In most normal fridge-freezers it is stored at -5 to -8 degrees celcius. In this state the atoms are tightly packed together, and they vibrate very little. Melted ice-cream has been heated so that it has become a liquid. This means that it has past the melting point of the substance that makes up the ice-cream. In this state, the atoms are a lot more free to move, and not so tightly packed together. If the ice-cream were to be heated further, then the water in the substance would evaporate, leaving behind anything else that made up the ice-cream.


Does metal stay like itself when heated or it goes back to its normal self?

When metal is heated beyond its melting point, it can change its structure permanently due to the atomic rearrangement that occurs. Once the metal cools down, it solidifies in its new structure, which may or may not be its original form depending on the temperature and time of heating.


When metal is heated the light emitted is because it gains energy as they return to lower energy levels?

Yes, when metal is heated, the atoms in the metal absorb energy and become excited. As they return to their normal energy levels, they release this excess energy in the form of light, which is known as incandescence. This is why heated metal appears to glow.


What is sublimation and give an example?

Sublimation is when a solid goes to a gas when heated rather than going to a liquid first. At normal pressure solid carbon dioxide and iodine go directly to vapor without going to a liquid first.