Energy Diagrams. We know that in order for a reaction to occur, reactant molecules must collide and that both an increase in the concentration of reactant molecules and an increase in the temperature of the system can cause an increase in reaction rate.
viewer - Computer Definition. (1) A program that renders the contents of a digital file on screen. Also called a browser, viewers may be stand-alone programs or components within a larger application. For audio and video formats, media players are used. See file viewer, graphics viewer, newsreader and media player. (2) A person who looks at an image or watches a movie.
cameo noun [ C ] (PERFORMANCE) âº a small but noticeable part in a film or play, performed by a famous actor: He appears briefly towards the end of the film in a cameo role as a priest. âº a piece of usually oval jewellery on which there is a head or other shape of one colour on a surface of a different colour: a cameo brooch.