Molecular solidsâ Made up of atoms or molecules held together by London dispersion forces, dipole-dipole forces, or hydrogen bonds. Characterized by low melting points and flexibility and are poor conductors. An example of a molecular solid is sucrose.
There are two main problems when it comes to hard-boiled eggs: green-gray yolks and shells that just wonât peel off. Make hard-boiled eggs headache-free by following this easy method. First, place the cold eggs in a single layer in a pan with enough cold water to cover them by about 1 inch. Then, place the pan on the stove over high heat. Shutterstock. As soon as the water comes to a boil turn the heat off, cover the pan, and remove it from the heat. Allow the eggs to sit in the water until they are cooked; about 9 minutes for a medium egg, 12 minutes for a large egg, and 15 minutes for an extra-large egg.
STEP 4: Set timer forâ¦. 1  3 minutes for very runny soft-boiled eggs with just-set whites. 2  4 minutes for runny soft-boiled eggs. 3  6 minutes for creamy, custard-y âmediumâ-boiled eggs.  8 minutes for firm (but still creamy) hard-boiled 1  eggs. 10 minutes for firm hard-boiled eggs.  12 minutes for very firm hard-boiled eggs.