Chemistry is the scientific discipline involved with compounds composed of atoms, i.e. elements, and molecules, i.e. combinations of atoms: their composition, structure, properties, behavior and the changes they undergo during a reaction with other compounds. Chemistry addresses topics such as how atoms and molecules interact via chemical bonds to form new chemical compounds.
squash requires a brief heat treatment, called blanching, in boiling water or steam, to destroy the enzymes before freezing. Cook (blanch) the squash for 3 minutes. Begin counting the blanching time as soon as you place the squash in the boiling water.
While many people recommend blanching carrots before you freeze them, this step isn't necessary. The purpose of blanching is to keep the carrots viable longer in the freezer. You can prepare and freeze unblanched carrots in a matter of minutes. If you use them within three months, you won't sacrifice quality.