What is the action force and the reaction force when you sit down on the chair

Match the mixture with the substance// i really need on this guys (it’s a pic btw)

Which three statements represent the benefits of performing experiments using computer simulations?

An unknown substance is a white solid at room temperature and has a melting point of 78 °c. which of the following substances is most likely to be the identity of the unknown sample? a. naphthalene, a molecular solid with the formula c10h8 b. silica, a network solid held together by covalent bonds with the formula sio2 c. calcium chloride, an ionic compound with the formula cacl2 d. water, an molecular compound with the formula h2o