Physical and chemical changes

Today my class and I had went on this trip and it was about science It was pretty cool. First we listened to a man named shaun so we knew what to then he turned on his tv and played a video for us. We watch a chemical thing but I can't remember the name. He grab two ice cubes and showed us what a normal ice could do and what a dry ice could do. The normal ice as you know would melt and the dry ice it would not melt it would skip the melting and it will straight away  evaporate.