16. What is formed when two or more substances are combined? A. Pure Substance B. Mixture C. Matter D. Solid Matter 17. What mixture has a uniform composition and exist in single form? A. Homogeneous Mixture C. Matter B. Heterogeneous Mixture D. Pure Substance 18. What mixture has NO uniform composition and exist in two or more phases? A. Matter C. Homogeneous Mixture B. Pure Substance B. Heterogeneous Mixture 19. Which is NOT a heterogeneous mixture? A. Cement B. Salad D. Air C. Halo-Halo 20. What does NOT belong the group? A. Air C. Dishwashing Liquid B. Mango Juice D. Fried Rice