Students will learn how to categorize matter as either pure substances or mixtures. Students will apply tests, based on physical properties of matter samples, to determine whether a mixture is ...

一、Homogeneous And Heterogeneous 托福听力原文： NARRATOR: Listen to part of a lecture in a chemistry class. MALE PROFESSOR: So, just to sum up, matter is anything that has mass and volume, right? Anything ...

Researchers demonstrated enzyme-like heterogeneous catalysis for the first time. They developed a highly active heterogeneous TiO2 photocatalyst incorporated with many single copper atoms. They used ...