Video -1: Matter, Elements & Compounds
The link address is: http://edutube.hccs.edu/media/Dr.+David+Schwartz+-+Essential+Chemistry+for+Biology+-+Matter%2C+Elements%2C+Compounds+-+1/0_gkr7k8yx
The link address is: http://edutube.hccs.edu/media/Dr.+David+Schwartz+-+Essential+Chemistry+for+Biology+-+Matter%2C+Elements%2C+Compounds+-+1/0_gkr7k8yx