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Do solids dissolve in water? If so which ones?

Yes, some solids will dissolve in water. They are commonly known as "water-soluble". Examples include salts and certain polymers (plastics). Searching for "water soluble materials" may help further.

Do solids melt? If so which ones?

Yes, some solids melt. Metals will melt, thermoplastics will melt, and glass will melt. Some solids will not melt into a liquid, and instead turn straight into a gas, this process is called Sublimation.

Do solids conduct electricity, and if so which ones?

Yes, some solids will conduct electricity. In order to do so, the material needs to have free roaming electrons within its molecular construction. Electrical conductivity is also dependent on temperature, so you have some materials that will only conduct if they are above/below a certain temperature. These materials are called semi-conductors, and include Silicon.

In addition, liquids like water will conduct electricity, which is why you should never use a water spray fire extinguisher to extinguish an electrical fire!

by Chris Taylor